45 results on '"Nabil Anwer"'
Search Results
2. Dynamic Bayesian network-based disassembly sequencing optimization for electric vehicle battery
- Author
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Jinhua Xiao, Nabil Anwer, Weidong Li, Benoît Eynard, and Chen Zheng
- Subjects
Industrial and Manufacturing Engineering - Published
- 2022
3. Geometric deviation modeling for single surface tolerancing using Laplace-Beltrami Operator
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Yifan Qie and Nabil Anwer
- Subjects
General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
4. A modeling method of complex assembly based on digital twin
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Zhi Junnan, Yang Jiangxin, Zhu Chongxin, Liu Shuhan, Nabil Anwer, and Cao Yanlong
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
5. Wasserstein generative adversarial networks for form defects modeling
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Yifan Qie, Mahdieh Balaghi, and Nabil Anwer
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
6. Elastic-Plastic Contact Behaviors Modeling for Tolerance Analysis
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Nan Shao, Jianhua Liu, and Nabil Anwer
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
7. Generative adversarial networks for tolerance analysis
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Benjamin Schleich, Yifan Qie, Sandro Wartzack, and Nabil Anwer
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Mechanical Engineering ,Industrial and Manufacturing Engineering - Published
- 2022
8. Data-driven deviation generation for non-ideal surfaces of Skin Model Shapes
- Author
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Yifan Qie and Nabil Anwer
- Subjects
General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
9. Evaluation of relations and accumulations of geometrical deviations in multi-stage manufacturing based on Skin Model Shapes
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Robert Hofmann, Sophie Gröger, and Nabil Anwer
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
10. An integrated open source CAT based on Skin Model Shapes
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Carlos Andres Restrepo Garcia, Denis Teissandier, Nabil Anwer, Vincent Delos, Yann Ledoux, and Laurent Pierre
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
11. Towards a Mathematical Definition of Skin Model for Geometrical Product Specification and Verification and its Physical Interpretation
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Nabil Anwer and Vijay Srinivasan
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
12. Toward non-default partitioning for compound feature identification in engineering design
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Yifan Qie and Nabil Anwer
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Identification (information) ,Feature (computer vision) ,business.industry ,Computer science ,General Earth and Planetary Sciences ,Pattern recognition ,Artificial intelligence ,Engineering design process ,business ,General Environmental Science - Published
- 2021
13. Enabling technologies and tools for digital twin
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Nabil Anwer, Ang Liu, Fei Tao, Lihui Wang, Andrew Y. C. Nee, Qinglin Qi, Tianliang Hu, Yongli Wei, Beihang University (BUAA), Shandong University, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), University of New South Wales [Sydney] (UNSW), Royal Institute of Technology [Stockholm] (KTH ), and National University of Singapore (NUS)
- Subjects
0209 industrial biotechnology ,Service (systems architecture) ,Computer science ,Process (engineering) ,02 engineering and technology ,Space (commercial competition) ,Data science ,Data type ,Industrial and Manufacturing Engineering ,[SPI]Engineering Sciences [physics] ,020901 industrial engineering & automation ,Hardware and Architecture ,Control and Systems Engineering ,0202 electrical engineering, electronic engineering, information engineering ,[INFO]Computer Science [cs] ,020201 artificial intelligence & image processing ,Product (category theory) ,[MATH]Mathematics [math] ,ComputingMilieux_MISCELLANEOUS ,Software - Abstract
Digital twin is revolutionizing industry. Fired by sensor updates and history data, the sophisticated models can mirror almost every facet of a product, process or service. In the future, everything in the physical world would be replicated in the digital space through digital twin technology. As a cutting-edge technology, digital twin has received a lot of attention. However, digital twin is far from realizing their potential, which is a complex system and long-drawn process. Researchers must model all the different parts of the objects or systems. Varied types of data needed to be collected and merged. Many researchers and participators in engineering are not clear which technologies and tools should be used. 5-dimension digital twin model provides reference guidance for understanding and implementing digital twin. From the perspective of 5-dimension digital twin model, this paper tries to investigate and summarize the frequently-used enabling technologies and tools for digital twin to provide technologies and tools references for the applications of digital twin in the future.
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- 2021
14. A function-oriented surface reconstruction framework for reverse engineering
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Sandro Wartzack, Yifan Qie, Sebastian Bickel, Nabil Anwer, and Benjamin Schleich
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Geometric reconstruction ,Reverse engineering ,0209 industrial biotechnology ,Data processing ,Computer science ,Process (engineering) ,Mechanical Engineering ,media_common.quotation_subject ,02 engineering and technology ,Asset (computer security) ,computer.software_genre ,Industrial and Manufacturing Engineering ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,Computer engineering ,Focus (optics) ,Function (engineering) ,computer ,Surface reconstruction ,media_common - Abstract
Reverse engineering can be considered as the methodological process of analyzing and reconstructing a digital model of a physical asset. It has gained considerable interest with the advent of sophisticated sensors and data processing technologies hence becoming an important enabler for the product digital twin. However, while existing approaches to reverse engineering focus on the mere geometric reconstruction, this paper presents a novel paradigm called function-oriented surface reconstruction, that is capable of reconstructing the underlying part and surface function and thus outperforms existing methods. The applicability of the presented method is demonstrated through a case study of a gearbox.
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- 2021
15. Characterization of L-PBF lattice structures geometric defects
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Kévin Ferreira, Nabil Anwer, and Charyar Mehdi-Souzani
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Computer science ,business.industry ,System of measurement ,Process (computing) ,Mechanical engineering ,computer.software_genre ,Characterization (materials science) ,Simulation software ,Range (mathematics) ,Complex geometry ,Software ,General Earth and Planetary Sciences ,business ,computer ,General Environmental Science ,Visual programming language - Abstract
An increasing interest in lattice structures is developing in various industrial sectors. These structures, composed of several cavities or voids, are used in a wide range of applications. They allow to lighten workpieces while maintaining good mechanical characteristics. Although these structures offer new design opportunities, they are difficult to manufacture because of their complex geometry and internal surfaces that are difficult to access. The special characteristics of lattice structures almost always require the use of additive manufacturing processes. By using lattice structures, new problems arise in additive manufacturing, such as lattice defects characterization and measurement issues. The objective of this study is to characterize the geometric defects of lattice structures obtained using L-PBF additive manufacturing process. Lattice structures exhibit not only common defects inherent to L-PBF process, but other geometric defects specific to their unit cell that require appropriate measurement systems and new processing techniques. This paper deals with a systematic approach to evaluate geometric defects obtained from Additive Manufacturing simulation software. First, lattice structures are generated using Rhino-Grasshoper visual programming capabilities. Then, virtual parts are built using Ansys Additive software. Registration methods are used thereafter to compare the simulated and the nominal models. The advantage of non-rigid methods such as CPD and BCPD for registration is highlighted. Finally, the obtained data can be used in the future to enhance the predictive modeling of geometric defects in L-PBF.
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- 2021
16. Coevolution of digitalisation, organisations and Product Development Cycle
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Lionel Roucoules and Nabil Anwer
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Process management ,Product design ,Thread (network protocol) ,Computer science ,business.industry ,Mechanical Engineering ,design ,Digital transformation ,CAD ,Digital Transformation ,Sciences de l'ingénieur ,Industrial and Manufacturing Engineering ,Computer Aided Design ,Product lifecycle ,New product development ,Information flow (information theory) ,business ,Coevolution - Abstract
Over the past 70 years, product design has undergone many important changes due to the impact of contemporary digital technologies (i.e. digital design). To support digital design and information flow throughout the product lifecycle, the digital-driven technologies currently in use rely on the evolution of CAD and PLM systems to address new design and manufacturing challenges generated by the new era of 4.0 digital transformation. This paper will discuss the past and present coevolution and shortcomings within industrial organisations, the digital technologies employed in the product development cycle and will illustrate the current challenges and future prospects of the digital thread for design.
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- 2021
17. Convolutional Neural Network for geometric deviation prediction in Additive Manufacturing
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Nabil Anwer, Zuowei Zhu, Luc Mathieu, Kévin Ferreira, Kai Guo, Lihong Qiao, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), Beihang University (BUAA), and Anwer, Nabil
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0209 industrial biotechnology ,[SPI] Engineering Sciences [physics] ,Computer science ,media_common.quotation_subject ,Convolutional Neural Network ,CAD ,[MATH] Mathematics [math] ,02 engineering and technology ,Process variable ,[INFO] Computer Science [cs] ,010501 environmental sciences ,computer.software_genre ,01 natural sciences ,Convolutional neural network ,Compensation (engineering) ,[SPI]Engineering Sciences [physics] ,Consistency (database systems) ,020901 industrial engineering & automation ,Geometric deviation modeling ,[INFO]Computer Science [cs] ,Quality (business) ,[MATH]Mathematics [math] ,0105 earth and related environmental sciences ,General Environmental Science ,media_common ,business.industry ,Deep learning ,Process (computing) ,Design for Additive Manufacturing ,General Earth and Planetary Sciences ,Artificial intelligence ,Data mining ,business ,computer - Abstract
International audience; The geometrical quality of AM products is an indispensable concern when conducting Design for Additive Manufacturing (DfAM), since it dominates the geometrical consistency between the manufactured samples and the design intent and has an impact on the functionality of the products. Therefore, effective prediction of the geometric deviations prior to the mass production will provide useful information for designers in order for design optimization. Data-driven methods open up new possibilities to gain high-fidelity prediction based on existing observable data. In this paper, a Convolutional Neural Network based deep learning method is proposed which enables the prediction of deviations for different shapes and process settings. A data augmentation technique is also introduced to generate samples for network training based on a small number of available data. Through a case study, it's demonstrated that the trained network manages to accurately predict the geometric deviations of shapes manufactured with varied size and process parameter settings. The predicted deviations could substantially benefit DfAM in evaluation of geometrical consistency. Moreover, reverse compensation can be accordingly applied to the CAD model prior to the manufacturing process, thus increasing the geometrical accuracy of the manufactured parts. c 2020 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the scientific committee of the CIRP Design Conference 2020.
- Published
- 2020
18. Integration of surface deformations into polytope-based tolerance analysis: application to an over-constrained mechanism
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Nan Shao, Zhiqiang Zhang, Laurent Pierre, Nabil Anwer, and Jianhua Liu
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Surface (mathematics) ,0209 industrial biotechnology ,Tolerance analysis ,Computer science ,Fast Fourier transform ,Polytope ,02 engineering and technology ,010501 environmental sciences ,Topology ,01 natural sciences ,Field (computer science) ,020901 industrial engineering & automation ,Conjugate gradient method ,General Earth and Planetary Sciences ,Polytope model ,Abstract polytope ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Polytope-based tolerance analysis has shown a great potential in the Computer Aided Tolerancing (CAT) field. Previous works have considered form defects into this model, which overcomes the drawback of considering toleranced features as surfaces of perfect form. To enrich the capability and applicability of conventional polytope model, this paper further integrates the combined effects of form defects and surface deformations into polytope-based tolerance analysis. Specifically, form defects are considered based on the concept of Skin Model Shapes and surface deformations are calculated based on a Conjugate Gradient Fast Fourier Transform (CG-FFT) method. Thereafter, the polytope-based tolerance analysis is applied to an over-constrained mechanism. With the consideration of non-ideal surface contact status, this new polytope model provides more realistic and accurate analysis results.
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- 2020
19. Skin Model Shapes for multi-stage manufacturing in single-part production
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Robert Hofmann, Sophie Gröger, and Nabil Anwer
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0209 industrial biotechnology ,Computer science ,Virtual representation ,Control engineering ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Outcome (probability) ,Field (computer science) ,Multi stage ,020901 industrial engineering & automation ,Machining ,Product (mathematics) ,General Earth and Planetary Sciences ,Production (economics) ,Stage (hydrology) ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Geometrical features are fundamental elements for the fulfilment of the functional product requirements. Therefore, their inevitable deviations caused by manufacturing inaccuracies are the main issues in the field of tolerance management. To close the gap between physical part description and nominal model representation, the framework of discrete geometrical representatives via Skin Model Shapes has been developed and continuously enhanced. As the underlying concepts are based on final virtual parts, consistent inferences to every single manufacturing step are not fully investigated in literature. This paper presents the development of Skin Model Shapes based on the virtual representation of intermediate part outcome (in-process geometry) and the integration of machining processes. Thus, integration and simulation of different kinds of deviations are enabled at each manufacturing stage considering error accumulation due to machine specific inaccuracies, such as tool movement and fixturing. Furthermore, the effect of inaccuracies on the final conformance result can be quantified at each manufacturing stage. A case study is presented to illustrate the entire approach and to demonstrate the validity of the proposed methods.
- Published
- 2020
20. Geometric Tolerance Characterization of Laser Powder Bed Fusion Processes Based on Skin Model Shapes
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Baltej Singh Rupal, Ahmed Jawad Qureshi, Marc Secanell, and Nabil Anwer
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0209 industrial biotechnology ,Fusion ,Materials science ,Mechanical engineering ,02 engineering and technology ,010501 environmental sciences ,Laser ,01 natural sciences ,law.invention ,Characterization (materials science) ,020901 industrial engineering & automation ,law ,Powder bed ,Geometric dimensioning and tolerancing ,General Earth and Planetary Sciences ,0105 earth and related environmental sciences ,General Environmental Science ,Shrinkage - Abstract
Geometric tolerance characteristics of metal additive manufactured (AM) parts play a significant role in ensuring the part functionality. In such cases, prior estimation of geometric tolerances, i.e. geometric dimensioning and tolerancing (GD&T) characteristics, can prove vital to reduce part rejection and to minimize material wastage and cost. This article presents a framework to estimate geometric tolerances in laser powder bed fusion (LPBF) processes. For a given geometry, skin model shapes are generated based on material shrinkage and thermo-mechanical simulation. Samples from skin model shapes are utilized for geometric tolerance estimation. A case study is presented to validate the developed framework and demonstrate its applicability in metal AM.
- Published
- 2020
21. Integrated training in using different Coordinate Measuring Systems to support Digital Manufacturing
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Enrico Savio, Nabil Anwer, Michael Marxer, Marco Menoncin, Universita degli Studi di Padova, Interstate University of Applied Sciences Buchs NTB, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan)
- Subjects
Reverse engineering ,0209 industrial biotechnology ,Training in industry ,Coordinate Metrology ,Blended Learning ,Computer science ,Supply chain ,Automotive industry ,02 engineering and technology ,computer.software_genre ,Industrial and Manufacturing Engineering ,[SPI]Engineering Sciences [physics] ,020901 industrial engineering & automation ,0203 mechanical engineering ,Artificial Intelligence ,[INFO]Computer Science [cs] ,[MATH]Mathematics [math] ,Competence (human resources) ,ComputingMilieux_MISCELLANEOUS ,Digitization ,business.industry ,System of measurement ,Manufacturing engineering ,Blended learning ,020303 mechanical engineering & transports ,Digital manufacturing ,business ,computer - Abstract
Highly qualified labour force is a key resource for growth. In modern manufacturing, the competent use of advanced measuring equipment for inspection and digitization of parts is an essential competence that is needed for both advanced product/process engineering and quality control. Coordinate Metrology (including 3D digital measuring technologies) is by far the most important tool for these specialized activities. As widely reported, the individuals operating the measuring systems - with their decisions - are frequently one of the most relevant error sources in Coordinate Metrology operations, especially when dealing with new measuring technologies supporting Digital Manufacturing (e.g. Computed Tomography, Fringe-projection, Reverse Engineering). The paper reports the intermediate results of an initiative aiming at innovating training in Coordinate Metrology, focused on supporting the needs of SMEs in the supply chain of the automotive industry. The main target group are industry employees operating in SMEs that are newcomers on 3D measuring technologies. An integrated concept for training in Coordinate Metrology has been developed using a blended learning approach, based on a 10-steps structure and incorporating the learning outcomes required to operate different measuring systems in a consistent way.
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- 2019
22. Geometric deviation modeling with Statistical Shape Analysis in Design for Additive Manufacturing
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Nabil Anwer, Zuowei Zhu, Luc Mathieu, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan)
- Subjects
0209 industrial biotechnology ,Computer science ,Statistical shape analysis ,Design for additive manufacturing ,Process (computing) ,02 engineering and technology ,010501 environmental sciences ,Geometric consistency ,01 natural sciences ,Compensation (engineering) ,[SPI]Engineering Sciences [physics] ,symbols.namesake ,020901 industrial engineering & automation ,Geometric design ,symbols ,General Earth and Planetary Sciences ,[INFO]Computer Science [cs] ,[MATH]Mathematics [math] ,Surface deformation ,Gaussian process ,Algorithm ,ComputingMilieux_MISCELLANEOUS ,ComputingMethodologies_COMPUTERGRAPHICS ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Effective modeling of geometric deviations is an important issue in Design for Additive Manufacturing (DfAM), since it enables the evaluation of geometric consistency and the optimization of geometric design. Motivated by the awareness that process-related factors have non-trivial effects on geometric deviations, a new method is proposed in this paper which combines Statistical Shape Analysis with Gaussian Process to enable the modeling of deviations with consideration of process parameters. By learning from a number of simulated samples, the method could achieve effective prediction of deviations for new parts. Its applications in surface deformation evaluation and geometric compensation are also discussed, which will bring substantial benefits to DfAM.
- Published
- 2019
23. Design of an ultra-high precision machine for form measurement
- Author
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Mohamed Damak, Saint-Clair Toguem, Hichem Nouira, Alain Vissiere, Nabil Anwer, Charyar Mehdi-Souzani, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), Laboratoire commun de métrologie LNE-CNAM (LCM), Laboratoire National de Métrologie et d'Essais [Trappes] (LNE )-Conservatoire National des Arts et Métiers [CNAM] (CNAM), Chercheur indépendant, and Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan)
- Subjects
0209 industrial biotechnology ,Similarity (geometry) ,Computer science ,Assembly ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Personalization ,[SPI]Engineering Sciences [physics] ,020901 industrial engineering & automation ,Family identification ,Production (economics) ,[INFO]Computer Science [cs] ,Product (category theory) ,[MATH]Mathematics [math] ,Architecture ,0105 earth and related environmental sciences ,General Environmental Science ,business.industry ,Industrial engineering ,Design method ,Variety (cybernetics) ,General Earth and Planetary Sciences ,Graph (abstract data type) ,business ,Agile software development - Abstract
International audience; In today's business environment, the trend towards more product variety and customization is unbroken. Due to this development, the need of agile and reconfigurable production systems emerged to cope with various products and product families. To design and optimize production systems as well as to choose the optimal product matches, product analysis methods are needed. Indeed, most of the known methods aim to analyze a product or one product family on the physical level. Different product families, however, may differ largely in terms of the number and nature of components. This fact impedes an efficient comparison and choice of appropriate product family combinations for the production system. A new methodology is proposed to analyze existing products in view of their functional and physical architecture. The aim is to cluster these products in new assembly oriented product families for the optimization of existing assembly lines and the creation of future reconfigurable assembly systems. Based on Datum Flow Chain, the physical structure of the products is analyzed. Functional subassemblies are identified, and a functional analysis is performed. Moreover, a hybrid functional and physical architecture graph (HyFPAG) is the output which depicts the similarity between product families by providing design support to both, production system planners and product designers. An illustrative example of a nail-clipper is used to explain the proposed methodology. An industrial case study on two product families of steering columns of thyssenkrupp Presta France is then carried out to give a first industrial evaluation of the proposed approach.
- Published
- 2019
24. Reference data simulation for L∞ fitting of aspheres
- Author
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Yassir Arezki, Hichem Nouira, Nabil Anwer, and Charyar Mehdi-Souzani
- Subjects
Observational error ,060102 archaeology ,Manufacturing process ,Computer science ,Reference data (financial markets) ,06 humanities and the arts ,01 natural sciences ,Field (computer science) ,010309 optics ,Distribution (mathematics) ,Surface fitting ,Dimensional metrology ,0103 physical sciences ,Curve fitting ,General Earth and Planetary Sciences ,0601 history and archaeology ,Algorithm ,General Environmental Science - Abstract
In the field of dimensional metrology of optical components, fitting algorithms play an essential role. Performing data fitting according to L∞-norm indicates about form errors since it directly minimizes peak-to-valley (PV). In parallel, reference data (softgauges) are used to assess the performance of the developed algorithms and must incorporate multiple parameters related to points distribution, manufacturing process and measurement errors, to be as close as possible to the real measured data. In this paper, a developed algorithm for surface fitting based on L∞-norm is presented and tested on simulated reference data of aspheres.
- Published
- 2018
25. Tolerancing: Managing uncertainty from conceptual design to final product
- Author
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Luc Mathieu, Nabil Anwer, Rikard Söderberg, Xiangqian Jiang, Ahmed Jawad Qureshi, Giovanni Moroni, Jean-Yves Dantan, Edward P. Morse, University of North Carolina [Charlotte] (UNC), University of North Carolina System (UNC), Laboratoire de Conception Fabrication Commande (LCFC), Université de Lorraine (UL)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), École normale supérieure - Cachan (ENS Cachan), Chalmers University of Technology [Göteborg], Politecnico di Milano [Milan] (POLIMI), University of Alberta, and University of Huddersfield
- Subjects
0209 industrial biotechnology ,Design ,Ideal (set theory) ,Computer science ,Mechanical Engineering ,Final product ,Uncertainty ,0211 other engineering and technologies ,02 engineering and technology ,Sciences de l'ingénieur ,Product function ,Industrial and Manufacturing Engineering ,Field (computer science) ,[SPI]Engineering Sciences [physics] ,020901 industrial engineering & automation ,Risk analysis (engineering) ,Conceptual design ,Order (exchange) ,Tolerancing ,Design, Tolerancing, Uncertainty ,021106 design practice & management - Abstract
International audience; Variability is unavoidable in the realization of products. While design must specify ideal geometry, it shall also describe limits of variability (tolerances) that must be met in order to maintain proper product function. Although tolerancing is a mature field, new manufacturing processes and design methodologies are creating new avenues of research, and modelling standards must also evolve to support these processes. In addition, the study of uncertainty has produced widely-accepted methods of quantifying variability, and modern tolerancing tools should support these methods. The challenges introduced by new processes and design methodologies continue to make tolerancing research a fertile and productive area.
- Published
- 2018
26. Freeform Machining Features: New Concepts and Classification
- Author
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Soumiya Bendjebla, Na Cai, Nabil Anwer, Charyar Mehdi-Souzani, Sylvain Lavernhe, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan)
- Subjects
0209 industrial biotechnology ,Engineering drawing ,Feature classification ,Computer science ,Process (computing) ,Machining Feature ,020207 software engineering ,Graph theory ,02 engineering and technology ,[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] ,[SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph] ,Domain (software engineering) ,[SPI]Engineering Sciences [physics] ,STEP-NC ,020901 industrial engineering & automation ,Machining ,0202 electrical engineering, electronic engineering, information engineering ,Numerical control ,Feature (machine learning) ,General Earth and Planetary Sciences ,Freeform ,Representation (mathematics) ,General Environmental Science - Abstract
International audience; During the last decades, many researches and applications have been conducted on machining features modeling and classification. Althoughseveral approaches have been used in the domain of Computer-Aided Process Planning (CAPP), the consideration of freeform shapes has notbeen well explored at present. This paper aims to provide an up-to-date review of machining features and its conformance with STEP-NC (STEPcompliant Numerical Control). A new method based on discrete shape representation, differential geometry and graph theory is developed forfreeform machining feature characterization and classification. The effectiveness of the proposed method is demonstrated through an example ofa blade part.
- Published
- 2018
27. Consideration of Working Conditions in Assembly Tolerance Analysis
- Author
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Liu Ting, Zhu Zuowei, Nabil Anwer, Cao Yanlong, and Yang Jiangxin
- Subjects
0209 industrial biotechnology ,Tolerance analysis ,business.industry ,Computer science ,Functional requirement ,02 engineering and technology ,Structural engineering ,Rigid body ,Finite element method ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,General Earth and Planetary Sciences ,Representation (mathematics) ,business ,General Environmental Science - Abstract
Mechanical deviations induced by working conditions are always ignored in assembly analysis due to the rigid body hypothesis of parts. This paper presents a study of the deviations resulting from the actual working conditions. Finite element analysis (FEA) is conducted to simulate the deviations occurring in assemblies, in which the point-cloud geometry representation of deformed parts is adopted to enable the calculation of small displacements by means of relative positioning. The simulated deviations are incorporated in manufacturing deviations to determine the functional requirements based on Jacobian-torsor model. The approach is finally illustrated by a practical example.
- Published
- 2018
28. On the usage of Least Material Requirement for Functional Tolerancing
- Author
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Laurent Pierre, Nabil Anwer, and Bernard Anselmetti
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0209 industrial biotechnology ,Computer science ,020207 software engineering ,02 engineering and technology ,Reliability engineering ,020901 industrial engineering & automation ,Dimensional metrology ,0202 electrical engineering, electronic engineering, information engineering ,Conformity assessment ,General Earth and Planetary Sciences ,Representation (mathematics) ,Wall thickness ,General Environmental Science ,Functional tolerancing - Abstract
ISO 2692 core concepts: Maximum Material Requirement (MMR) and Least Material Requirement (LMR) are well established for functional tolerancing and are used to guarantee assemblability, extremal values of clearance and minimum wall thickness. The LMR has not been extensively investigated in research and still not enough considered in industrial practices. In this paper, LMR’s capability to devise requirements on assemblies with clearance is shown, and the conformity assessment, in dimensional metrology, based on Least Material Virtual Size is presented. A case study demonstrates the effectiveness of this work. New insights for virtual size representation within tolerance zone are also discussed.
- Published
- 2018
29. Shape Transformation Perspective for Geometric Deviation Modeling in Additive Manufacturing
- Author
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Nabil Anwer, Zuowei Zhu, and Luc Mathieu
- Subjects
0209 industrial biotechnology ,Perspective (graphical) ,Process (computing) ,02 engineering and technology ,010501 environmental sciences ,Translation (geometry) ,Space (mathematics) ,01 natural sciences ,020901 industrial engineering & automation ,Transformation (function) ,Product (mathematics) ,General Earth and Planetary Sciences ,Applied mathematics ,Rotation (mathematics) ,Scaling ,0105 earth and related environmental sciences ,General Environmental Science ,Mathematics - Abstract
Geometric deviations arising from multiple variation sources in Additive Manufacturing (AM) process chain have been a major issue regarding product quality. Therefore, effective modeling of the geometric deviations is becoming critical for AM. In this paper, in-plane geometric deviations are investigated based on the assumption that typical deviation sources in AM can be mapped to different transformations (scaling, rotation, translation) on the nominal shape. By defining transformation parameters, analytical deviation models of regular shapes can be derived in the deviation space, and calibrated based on measurement data. A case study is presented to show the effectiveness of the proposed approach.
- Published
- 2018
30. Toward a Classification of Partitioning Operations for Standardization of Geometrical Product Specifications and Verification
- Author
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Nabil Anwer, Vijay Srinivasan, and Paul J. Scott
- Subjects
Product design specification ,0209 industrial biotechnology ,Standardization ,SIMPLE (military communications protocol) ,Computer science ,business.industry ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Metrology ,020901 industrial engineering & automation ,Manufacturing ,Systems engineering ,Global Positioning System ,Key (cryptography) ,General Earth and Planetary Sciences ,business ,Digitization ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Partitioning is one of the four major operations used in the international standards issued by ISO/TC 213 on geometrical product specifications and verifications (GPS, for short). The ISO GPS standards define both tolerancing (for specification) and metrology (for verification) practices that are of critical importance to manufacturing industry. Collectively, these emerging ISO GPS standards have the potential to be some of the key enablers of digitization of manufacturing (also known as smart manufacturing, cyber-physical manufacturing, cyber-physical production systems, and Industrie 4.0). In simple terms, partitioning operations divide a surface (ideal or measured) into subsets that are then subjected to further GPS operations. This paper addresses the classification problem of partitioning operations to provide a science-based solution for the development of ISO GPS partitioning standards. Such a classification is considered to be one of the first tasks that must be completed before detailed standards on partitioning can be developed.
- Published
- 2018
31. Digital twin towards smart manufacturing and industry 4.0
- Author
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Meng Zhang, Fei Tao, Lihui Wang, Andrew Y. C. Nee, Nabil Anwer, Ang Liu, and Liming Li
- Subjects
Industry 4.0 ,Hardware and Architecture ,Control and Systems Engineering ,Computer science ,Industrial and Manufacturing Engineering ,Software ,Smart manufacturing ,Manufacturing engineering - Published
- 2021
32. A Novel Method for Assemblability Evaluation of Non-Ideal Cylindrical Parts Assembly
- Author
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Yue Li, Lihong Qiao, Zhicheng Huang, and Nabil Anwer
- Subjects
Surface (mathematics) ,0209 industrial biotechnology ,Ideal (set theory) ,Computer science ,Process (computing) ,Mechanical engineering ,Boundary (topology) ,020207 software engineering ,02 engineering and technology ,Interference (wave propagation) ,Computer Graphics and Computer-Aided Design ,Industrial and Manufacturing Engineering ,Computer Science Applications ,Range (mathematics) ,020901 industrial engineering & automation ,Cone (topology) ,Search algorithm ,0202 electrical engineering, electronic engineering, information engineering - Abstract
The assemblability, which is the feasibility and difficulty of assembly, will greatly affect the efficiency and quality of assembly process, so assemblability analysis plays an important role during the design stage of products. Cylindrical parts assembly is a common structure with wide applications, whose assemblability can be affected by surface deviations, especially in some precision assemblies. In this paper, a novel method is proposed for the assemblability evaluation of cylindrical parts assembly considering surface deviations. Firstly, based on the surface deviations modeling of cylindrical parts and assembly clearance calculation, the assembly posture adjustment process is defined and simulated to obtain the assemblable postures without interference between parts. Then, in the proposed six dimensional posture space, a search algorithm is established to obtain the boundary points of assemblable posture space. Afterwards, in order to represent this irregular hyperspace, the largest inscribed generalized cone of which is put forward. Finally, based on the characteristics of generalized cone, two indicators are defined to reflect the adjustable range of assembly posture, which can realize the quantitative evaluation of assemblability. The validity of the proposed method is verified by case studies of cylindrical parts assemblies with different surface deviations.
- Published
- 2021
33. Shaping the digital twin for design and production engineering
- Author
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Nabil Anwer, Sandro Wartzack, Luc Mathieu, Benjamin Schleich, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
0209 industrial biotechnology ,Engineering ,Engineering drawing ,Design ,Realization (linguistics) ,02 engineering and technology ,010501 environmental sciences ,Metaverse ,01 natural sciences ,Product engineering ,Industrial and Manufacturing Engineering ,Bridge (nautical) ,Digital Twin ,[SPI]Engineering Sciences [physics] ,020901 industrial engineering & automation ,Tolerancing ,Production engineering ,[INFO]Computer Science [cs] ,Product (category theory) ,[MATH]Mathematics [math] ,Representation (mathematics) ,Reference model ,0105 earth and related environmental sciences ,business.industry ,Mechanical Engineering ,business - Abstract
International audience; The digitalization of manufacturing fuels the application of sophisticated virtual product models, which are referred to as digital twins, throughout all stages of product realization. Particularly, more realistic virtual models of manufactured products are essential to bridge the gap between design and manufacturing and to mirror the real and virtual worlds. In this paper, we propose a comprehensive reference model based on the concept of Skin Model Shapes, which serves as a digital twin of the physical product in design and manufacturing. In this regard, model conceptualization, representation, and implementation as well as applications along the product life-cycle are addressed. In today's highly competitive markets, the ambitions for shortening the time to market and for increasing the product development performance fuel the application of sophisticated virtual product models, which are frequently referred to as digital twins. Enabled by the digitalization of manufacturing, cyber-physical production systems, model-based system engineering, and a growing endeavour for data gathering and processing, these models are increasingly enriched with production and operation data. Moreover, they allow the efficient prediction of the effects of product and process development as well as operating and servicing decisions on the product behaviour without the need for costly and time-expensive physical mock-ups [1-3]. Particularly in design, such realistic product models are essential to allow the early and efficient assessment of the consequences of design decisions on the quality and function of mechanical products. However, current approaches to the implementation of digital twins lack of a conceptual basis, which hinders the applicability of the digital twin vision to various activities in design and production engineering. Motivated by this need, this paper proposes a comprehensive reference model, which serves as a digital twin of the physical product in design and production engineering. In this regard, important model properties, such as scalability, interoperability, expansibility, and fidelity, as well as different operations on this reference model along the product life-cycle, such as composition, decomposition, conversion, and evaluation are addressed. Moreover, the application of this reference model to geometrical variations management is highlighted. The paper is structured as follows. In the next section, the vision of the digital twin and its evolution is reviewed. After that, a comprehensive reference model for the digital twin is introduced, which is then applied to geometrical variations management. Finally, a conclusion and an outlook are given.
- Published
- 2017
34. Enhanced Invariance Class Partitioning using Discrete Curvatures and Conformal Geometry
- Author
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Yifan Qie, Nabil Anwer, and Lihong Qiao
- Subjects
Surface (mathematics) ,0209 industrial biotechnology ,Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Boundary (topology) ,020207 software engineering ,Context (language use) ,02 engineering and technology ,Topology ,Computer Graphics and Computer-Aided Design ,Industrial and Manufacturing Engineering ,Edge detection ,Computer Science Applications ,020901 industrial engineering & automation ,Differential geometry ,Principal curvature ,0202 electrical engineering, electronic engineering, information engineering ,Point (geometry) ,Conformal geometry - Abstract
Mesh models have been widely employed in current CAD/CAM systems, where the workpiece is considered as made up of a number of features limited by natural boundaries. The natural boundaries among features are in most cases edges where an abrupt change of point differential geometry properties occurs. However, such features and underlying surface portions could also be connected smoothly without an abrupt change at the natural boundaries. In the context of ISO GPS (Geometrical Product Specifications and Verification) Standards, partitioning is a fundamental operation that decomposes a mechanical part into independent surface portions for a functional specification purpose. In this paper, an enhanced mesh partitioning method is proposed to enable a feature-based decomposition considering kinematic invariance classes. The proposed two-step method includes an initial partitioning based on sharp edge detection and an enhanced partitioning process based on non-sharp edge rectification. The partitioning criteria rely on two surface descriptors derived from shapes’ principal curvatures: Curvedness and Shape Index. To refine the boundary points on non-sharp edges, conformal geometry is exploited during the enhanced partitioning process by mapping the 3D surface onto a 2D unit disk. Connecting regions without abrupt changes at their natural boundaries are well partitioned after the boundary rectification process. A statistical evaluation process is used to address invariance class identification for each partitioned surface portion on the part. Experiments and results on different mesh models are presented to demonstrate the effectiveness of invariance class partitioning for ISO GPS.
- Published
- 2021
35. Improved curvature-based registration methods for high-precision dimensional metrology
- Author
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Charyar Mehdi-Souzani, Rindra Rantoson, Nabil Anwer, Hichem Nouira, Laboratoire National de Métrologie et d'Essais [Trappes] (LNE ), Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan)
- Subjects
3D Registration ,Coarse registration ,Similarity (geometry) ,Hough Transformation ,Coordinate system ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Image registration ,02 engineering and technology ,RANSAC ,Curvature ,Hough transform ,law.invention ,[SPI]Engineering Sciences [physics] ,law ,0202 electrical engineering, electronic engineering, information engineering ,[INFO]Computer Science [cs] ,Computer vision ,[MATH]Mathematics [math] ,Computed tomography ,Mathematics ,business.industry ,Discrete Curvature ,General Engineering ,020207 software engineering ,Euclidean distance ,Transformation (function) ,ICP variant ,020201 artificial intelligence & image processing ,Artificial intelligence ,business ,Algorithm ,Ransac Transformation - Abstract
International audience; Multiple measurements using various data acquisition systems are generally required to substancially enhance measurement accuracy , reliability and holisticity of freeform shapes. The obtained multiple measurement data of the shape are transformed and fused into a common coordinate system within a registration technique involving coarse and fine alignments. Standardized methods have been established for fine registration such as Iterative Closest Points (ICP) and its variants. For coarse registration , no conventional method has been adopted yet despite a significant number of techniques which have been developed in the literature to supply an automatic rough matching between data sets. The work presented in this paper proposes an improvement of registration techniques by the consideration of new discrete curvature parameters. Two main issues are addressed in this paper : the coarse registration and the fine registration. For coarse registration , two novel automated methods based on the exploitation of discrete curvatures are presented : an enhanced Hough Transformation (HT) and an improved Ransac Transformation. The use of curvature features in both methods aims to reduce computational cost. For fine registration , a new variant of ICP method is proposed in order to reduce registration error using curvature parameters. A specific distance considering the curvature similarity is combined with Euclidean distance to define the distance criterion used for correspondences searching. Additionally , the objective function is improved by combining the point-to-point (P-P) minimization and the point-to-plane (P-Pl) minimization with automatic weights. The algorithms are applied on simulated and real data performed by a computed tomography (CT) system. The obtained results reveal the benefit of the proposed improved curvature-based registration methods .-2
- Published
- 2016
36. An Improved Tolerance Analysis Method Based on Skin Model Shapes of Planar Parts
- Author
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Nabil Anwer, Zuowei Zhu, and Lihong Qiao
- Subjects
assembly ,Model theory ,0209 industrial biotechnology ,Engineering drawing ,Engineering ,Tolerance analysis ,Orientation (computer vision) ,business.industry ,tolerance analysis ,02 engineering and technology ,Position tolerance ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,Position (vector) ,Product (mathematics) ,New product development ,Computer-aided ,General Earth and Planetary Sciences ,business ,Skin Model Shapes ,Algorithm ,GPS ,General Environmental Science - Abstract
Geometric deviations have huge influences on the functional behavior of product, which should be analyzed and properly controlled. Tolerance analysis, as a way to evaluate geometric deviations, is an essential part of product development. Current Computer Aided Tolerancing systems provide solutions for tolerance analysis but have limitations in the consideration of form deviations. The Skin Model theory, as a new research topic, represents part with non-ideal model that comprises geometric deviations, thus developing into a new computer aided tolerancing approach. In this paper, the related work with respect to the generation of Skin Model Shapes and its application in assembly simulation and tolerance analysis is briefly introduced. In order to overcome its shortcomings in the tolerance analysis employing SMSs, this paper proposes an improved method by taking advantage of the method adopted in a CAT system. The proposed method supports the analysis of position and orientation tolerances and has been proved to be valid through a case study.
- Published
- 2016
- Full Text
- View/download PDF
37. From reverse engineering to shape engineering in mechanical design
- Author
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Luc Mathieu, Nabil Anwer, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
Reverse engineering ,0209 industrial biotechnology ,Engineering drawing ,Engineering ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,02 engineering and technology ,computer.software_genre ,Industrial and Manufacturing Engineering ,[SPI]Engineering Sciences [physics] ,020901 industrial engineering & automation ,0202 electrical engineering, electronic engineering, information engineering ,Mechanical design ,[INFO]Computer Science [cs] ,[MATH]Mathematics [math] ,Representation (mathematics) ,ComputingMethodologies_COMPUTERGRAPHICS ,business.industry ,Mechanical Engineering ,020207 software engineering ,Characterization (materials science) ,Geometric design ,New product development ,Systems engineering ,Shape reconstruction ,business ,computer - Abstract
International audience; Reverse engineering and shape reconstruction play an important role in design and manufacturing through the increased use of shape acquisition and processing technologies in the product development process. The application of shape theories to geometric modelling and variability characterization are paving the way to shape engineering and more generic methods for reverse engineering.This paper investigates the fundamentals of shape representation, shape processing and mining at a conceptual, geometric and computational level to address geometric reverse engineering issues in mechanical design. New developed concepts based on discrete curvatures and their applications are presented. Challenges and future researches are also highlighted.
- Published
- 2016
38. Integration of Thermal Effects into Tolerancing Using Skin Model Shapes
- Author
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Nabil Anwer, Luc Mathieu, Lihong Qiao, Orzuri Rique Garaizar, Beihang University (BUAA), Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
Gas turbines ,0209 industrial biotechnology ,Engineering ,Geometrical deviations ,Mechanical engineering ,CAD ,02 engineering and technology ,Deformation (meteorology) ,Thermal effects ,[SPI]Engineering Sciences [physics] ,Skin model ,020901 industrial engineering & automation ,Product lifecycle ,0203 mechanical engineering ,Thermal ,[INFO]Computer Science [cs] ,[MATH]Mathematics [math] ,General Environmental Science ,business.industry ,Process (computing) ,Geometrical Product Specifications (GPS) ,Finite element method ,020303 mechanical engineering & transports ,FEA simulation ,General Earth and Planetary Sciences ,business ,Working environment - Abstract
International audience; The integration of more physical properties into the Skin model is fundamental for extending the tolerancing process to the different phases of the product lifecycle. This paper presents a study of the deformation effects on the Skin model provoked by the thermal and working environment of the workpiece. The proposed methodology departs from the Skin model at room temperature, and generates Skin Model Shapes by performing a Finite Element Analysis (FEA). The simulation tool has been successfully tested in the study of a practical industrial application, a gas turbine blade, which combines many of the nowadays challenges of CAD, FEA and CAT.
- Published
- 2016
39. Assembly Model Representation for Variation Analysis
- Author
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Na Cai, Nabil Anwer, and Lihong Qiao
- Subjects
Transformation matrix ,Transformation (function) ,Interface (Java) ,Computer science ,Product (mathematics) ,Assembly modelling ,Coordinate system ,General Earth and Planetary Sciences ,Variation (game tree) ,Focus (optics) ,Topology ,Algorithm ,General Environmental Science - Abstract
Assembly modeling is a very important activity for computerized analysis of product assembly, and it has been a subject of intense research over the past years. However, most of the assembly models focus on the assembly connective relationships between parts rather than assembly spatial relationships. Variation analysis is becoming a critical issue when specifying and verifying the geometric and dimensional requirements of assembly. In order to support dimensional variation analysis, a mathematical assembly model representation considering assembly spatial relationships is proposed in this paper. Four types of coordinate systems are defined. The nominal and variational spatial relationships among assembly elements are represented as homogeneous transformation matrix among different coordinate systems. The variations of assembly elements, mating interface and locating interface are represented as variation transformation matrix among corresponding coordinate systems. The variation of the final assembly is modeled as stack up of the differential motion vectors of coordinate systems of all the parts with respect to global coordinate system, and it can be calculated by homogeneous transformation and variation transformation. The different situations for two types of assemblies are distinguished in this novel assembly model representation.
- Published
- 2015
40. Skin Model Shapes: A new paradigm shift for geometric variations modelling in mechanical engineering
- Author
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Benjamin Schleich, Sandro Wartzack, Luc Mathieu, and Nabil Anwer
- Subjects
Product design specification ,Engineering drawing ,Engineering ,Operationalization ,business.industry ,Mechanical engineering ,Discrete geometry ,Observable ,Computer Graphics and Computer-Aided Design ,Industrial and Manufacturing Engineering ,Computer Science Applications ,Mechanical products ,Paradigm shift ,Global Positioning System ,business ,Shape analysis (digital geometry) - Abstract
Geometric deviations are inevitably observable on manufactured workpieces and have huge influences on the quality and function of mechanical products. Therefore, many activities in geometric variations management have to be performed to ensure the product function despite the presence of these deviations. Dimensional and Geometrical Product Specification and Verification (GPS) are standards for the description of workpieces. Their lately revision grounds on GeoSpelling, which is a univocal language for geometric product specification and verification and aims at providing a common understanding of geometric specifications in design, manufacturing, and inspection. The Skin Model concept is a basic concept within GeoSpelling and is an abstract model of the physical interface between a workpiece and its environment. In contrast to this understanding, established models for computer-aided modelling and engineering simulations make severe assumptions about the workpiece surface. Therefore, this paper deals with operationalizing the Skin Model concept in discrete geometry for the use in geometric variations management. For this purpose, Skin Model Shapes, which are particular Skin Model representatives from a simulation perspective, are generated. In this regard, a Skin Model Shape is a specific outcome of the conceptual Skin Model and comprises deviations from manufacturing and assembly. The process for generating Skin Model Shapes is split into a prediction and an observation stage with respect to the available information and knowledge about expected geometric deviations. Moreover, applications for these Skin Model Shapes in the context of mechanical engineering are given.
- Published
- 2014
41. From solid modelling to skin model shapes: Shifting paradigms in computer-aided tolerancing
- Author
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Luc Mathieu, Sandro Wartzack, Nabil Anwer, and Benjamin Schleich
- Subjects
Engineering drawing ,Product design ,Computer science ,business.industry ,Mechanical Engineering ,Discrete geometry ,Solid modelling ,Industrial and Manufacturing Engineering ,Product (mathematics) ,New product development ,Computer-aided ,Geometric dimensioning and tolerancing ,Representation (mathematics) ,business ,ComputingMethodologies_COMPUTERGRAPHICS - Abstract
Product design requires the consideration of geometric models and representations that reflect shape deviations and support tolerance management issues. Computer-Aided Tolerancing (CAT) systems have been developed as simulation tools for modelling the effects of tolerances on digital product simulation. However, geometric variations cannot be addressed efficiently with regard to form deviations. This paper investigates the concepts of Skin Model Shapes, which provide a finite describability and the digital representation of the Skin Model concept, and their unified discrete geometry representation. New contributions to tolerance representation and analysis are presented. Applications and perspectives for CAT systems are highlighted as well.
- Published
- 2014
42. The skin model, a comprehensive geometric model for engineering design
- Author
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Alex Ballu, Nabil Anwer, and Luc Mathieu
- Subjects
Engineering ,Engineering drawing ,Product design ,business.industry ,Mechanical Engineering ,Industrial engineering ,Industrial and Manufacturing Engineering ,Geometric design ,Product lifecycle ,Product (mathematics) ,New product development ,Representation (mathematics) ,Engineering design process ,business ,Geometric modeling ,ComputingMethodologies_COMPUTERGRAPHICS - Abstract
The modelling of product shapes and dimensions is now largely supported by geometric modelling tools. However, the underlying geometrical variations cannot be addressed efficiently when covering the overall product life cycle. The fundamental concept of skin model has been developed as an alternative to the nominal model and covers geometric deviations that are expected, predicted or already observed in real manufacturing processes. This paper investigates the fundamentals of the skin model at a conceptual, geometric and computational level. Representation and simulation issues for product design are presented. Finally, applications and perspectives are highlighted.
- Published
- 2013
43. Quick GPS: A new CAT system for single-part tolerancing
- Author
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Nabil Anwer, Bernard Anselmetti, Robin Chavanne, Jian-Xin Yang, Laboratoire Universitaire de Recherche en Production Automatisée (LURPA), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
0209 industrial biotechnology ,Engineering drawing ,Engineering ,positioning table ,ISO tolerancing standards ,Functional Dimensioning and Tolerancing ,02 engineering and technology ,Visual Basic for Applications ,specification synthesis ,Industrial and Manufacturing Engineering ,Position tolerance ,[SPI]Engineering Sciences [physics] ,020901 industrial engineering & automation ,CAT systems ,0202 electrical engineering, electronic engineering, information engineering ,Geometric dimensioning and tolerancing ,tolerancing rules ,business.industry ,Datum reference ,020207 software engineering ,Computer Graphics and Computer-Aided Design ,Computer Science Applications ,Geometrical product specification ,Function analysis ,Global Positioning System ,Computer-aided ,business - Abstract
International audience; This paper depicts a new CAT (Computer Aided Tolerancing) system called Quick GPS (Geometrical Product Specification), for assisting the designer when specifying the functional tolerances of a single part included in a mechanism, without any required complex function analysis. The mechanism assembly is first described through positioning table formalism. In order to create datum reference frames and to respect assembly requirements, an ISO-based 3D tolerancing scheme is then proposed thanks to a set of rules based on geometric patterns and TTRS (Technologically and Topologically Related Surfaces). Since it remains impossible to determine tolerance chains automatically, the designer must impose links between the frames. The CAT system we developed here proposes ISO based tolerance specifications to help ensure compliance with the designer's intentions saving on time and eliminating errors. This paper will detail both the set of tolerancing rules and the designer's approach. The Quick GPS system has been developed in a CATIA V5 environment using CATIA VBA and CATIA CAA procedures.
- Published
- 2010
44. Integrated Tolerancing Process for conceptual design
- Author
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Nabil Anwer, Luc Mathieu, and Jean-Yves Dantan
- Subjects
Data model ,Product design ,Concurrent engineering ,Conceptual design ,Computer science ,Mechanical Engineering ,Systems engineering ,Geometric dimensioning and tolerancing ,Design process ,Functional requirement ,Engineering design process ,Industrial and Manufacturing Engineering - Abstract
For car and aircraft industries, the management of geometrical variations has become an important issue in product design process and concurrent engineering. Indeed, designers need to manage dimensional and geometrical tolerances and to know information that contributed to their determination. The goal here is to put tolerancing in a concurrent engineering context. There are important questions that would need to be looked upon: How to integrate the tolerance synthesis in the design process? How to ensure the transition from function to geometrical specifications on parts? How to keep traceability of tolerances during the design process? Few answers exist today in academic works and there are few supports in CAD systems. Therefore, to build a coherent data model taken into account tolerances, we describe in this paper a multi-level approach that enables a tolerancing process integrated with conceptual design. The first level integrates information relating to functional aspects of an assembly. The second describes the structure of the assembly, and concerns the integration of functional needs and technological solutions. The last level translates functional requirements into geometrical requirements between/or on parts of the products, and provides the geometrical specifications on each part satisfying the geometrical requirements. This multi-level architecture is represented as an object oriented data model based on UML (Unified Modelling Language) that enable data management for functional tolerancing in design and keeping traces when querying about data.
- Published
- 2003
45. Geometric Product Specification of Gears: The GeoSpelling Perspective
- Author
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Zhang, Min, primary, Shi, ZhaoYao, additional, Mathieu, Luc, additional, Nabil, Anwer, additional, and Yang, Jianxin, additional
- Published
- 2015
- Full Text
- View/download PDF
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