7 results on '"high-fidelity modelling"'
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2. Simulation of the Effects of Backlash on the Performance of a Collaborative Robot: A Preliminary Case Study
- Author
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Guida, Roberto, Raviola, Andrea, Migliore, Domenico Fabio, De Martin, Andrea, Mauro, Stefano, Sorli, Massimo, Ceccarelli, Marco, Series Editor, Agrawal, Sunil K., Advisory Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, Müller, Andreas, editor, and Brandstötter, Mathias, editor
- Published
- 2022
- Full Text
- View/download PDF
3. High-fidelity computational modelling of fluid-structure interaction for moored floating bodies
- Author
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De Guilhem De Lataillade, Tristan Marie Arnaud, Johanning, Lars, Tezdogan, Tahsin, and Ingram, David
- Subjects
620.1 ,fluid-structure interaction ,FSI ,computational fluid dynamics ,CFD ,moorings ,high-fidelity modelling ,multiphysics ,renewable energy ,finite element method ,FEM - Abstract
The development and implementation process of a complete numerical framework for high-fidelity Fluid–Structure Interaction (FSI) simulations of moored floating bodies using Computational Fluid Dynamics (CFD) with the Finite Element Method (FEM) is presented here. For this purpose, the following three main aspects are coupled together: Two-Phase Flow (TPF), Multibody Dynamics (MBD), and mooring dynamics. The fluid–structure problem is two-way and fully partitioned, allowing for high modularity of the coupling and computational efficiency. The Arbitrary Lagrangian–Eulerian (ALE) formulation is used for describing the motion of the mesh-conforming fluid–solid interface, and mesh deformation is achieved with linear elastostatics. Mooring dynamics is performed using gradient deficient Absolute Nodal Coordinate Formulation (ANCF) elements with a two-way mooring–structure coupling and a one-way fluid–mooring coupling. Hydrodynamic loads are applied accurately along mooring cables using the solution of the fluid velocity provided by the TPF solver. For this purpose, fluid mesh elements containing cable nodes that do not conform to the fluid mesh are located with a computationally efficient particle-localisation algorithm. As it is common for partitioned FSI simulations of solids moving within a relatively dense fluid to experience unconditional instability from the added mass effect in CFD, a non-iterative stabilisation scheme is developed here. This is achieved with an accurate and dynamic estimation of the added mass for arbitrarily shaped structures that is then applied as a penalty term to the equations of motion of the solid. It is shown that this stabilisation scheme ensures stability of FSI simulations that are otherwise prone to strong added mass effect without affecting the expected response of structures significantly, even when using fully partitioned fluid–structure coupling schemes. Thorough verification and validation for all aspects of the FSI framework ultimately show that the produced numerical results are in good agreement with experimental data and other inherently stable numerical models, even when complex nonlinear events occur such as vortices forming around sharp corners or extreme wave loads and overtopping on moving structures. It is also shown that the mooring dynamics model can successfully reproduce nonlinearities from high frequency fairlead motions and hydrodynamic loads. The large-scale 3D simulation of a floating semi-submersible structure moored with three catenary lines ties all the models and tools developed here together and shows the capability of the high-fidelity FSI framework to model complex systems robustly and accurately.
- Published
- 2019
- Full Text
- View/download PDF
4. Flow-Induced Fibre Compaction in Resin-Injection Pultrusion.
- Author
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Sandberg, Michael, Hattel, Jesper H., and Spangenberg, Jon
- Subjects
COMPACTING ,PULTRUSION ,MANUFACTURING processes ,TEMPERATURE measurements ,FIBERS ,NUMERICAL analysis - Abstract
Resin-injection pultrusion (RIP) processes utilise a high resin pressure to ensure fast resin impregnation. When the resin is injected, the fibre material may compress and deform, and since the material flow is closely related to the fibre volume fraction, it is important to understand and predict the effects of flow-induced fibre compaction. In this paper, we derive the governing equations and present a novel numerical framework for analyses of flow-induced fibre compaction in RIP. Based on temperature measurements and material characterisation of the fibre reinforcement (compaction behaviour and permeability), we analyse the effects of flow-induced fibre compaction on non-isothermal material flow in an industrial RIP process. For the case study, we found that fibre compaction reduced flow resistance and facilitated resin impregnation as the fibre volume fraction was locally reduced near the inlet. This meant that the flow front was moved upstream (≈ 3 cm) and the exit pressure was increased from 4.8 to 6.2 bar. Also, the fibre volume fraction was increased in the centre of the profile, whereby impregnation took place over a longer distance as the flow front had a deeper apex. Finally, we showed that the compaction response of the fibre material remained largely unaffected by the magnitude of the injection pressure, which was not the case for the fibre volume fraction, pulling speed, and resin viscosity. This work and the presented methodology are important contributions towards improving the understanding of the material flow in RIP, in particular, for larger profiles with a lower fibre volume fraction. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
5. A High-Fidelity Modelling Method for Mine Haul Truck Dumping Process
- Author
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Aaron Young and William Pratt Rogers
- Subjects
dumping ,digital transformation ,high-fidelity modelling ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Dumping is one of the main unit operations of mining. Notwithstanding a long history of using large rear dump trucks in mining, little knowledge exists on the cascading behavior of the run-of-mine material during and after dumping. In order to better investigate this behavior, a method for generating high fidelity models (HFMs) of dump profiles was devised and investigated. This method involved using unmanned aerial vehicles with mounted cameras to generate photogrammetric models of dumps. Twenty-eight dump profiles were created from twenty-three drone flights. Their characteristics were presented and summarized. Four types of dump profiles were observed to exist. Factors that influence the determination of these profiles include the location of the truck relative to the dump crest, the movement of the underlying dump material during the dumping process and the differences in the dump profile prior to dumping. The HFMs created in this study could possibly be used for calibrating computer simulations of dumps to better match reality.
- Published
- 2022
- Full Text
- View/download PDF
6. Ground crash area estimation of quadrotor aircraft under propulsion failure
- Author
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Mohd Hasrizam Che Man, Anush Kumar Sivakumar, Haoliang Hu, Kin Huat Low, School of Mechanical and Aerospace Engineering, and Air Traffic Management Research Institute
- Subjects
Aircraft Flight Control System ,Unmanned Aircraft Systems ,High-Fidelity Modelling ,Aeronautical engineering::Accidents and air safety [Engineering] ,Aeronautical engineering::Flight simulation [Engineering] ,Aerospace Engineering ,Transportation ,Unmanned Aerial Vehicle ,Management, Monitoring, Policy and Law ,Crash Trajectory Prediction ,Management of Technology and Innovation ,Safety Analysis ,Quad Rotor ,Aeronautical engineering::Aircraft motors and engines [Engineering] ,Propulsion System Failure ,Safety Research ,Risk Analysis ,Energy (miscellaneous) - Abstract
Small unmanned aircraft systems or drones are expected to be used for different applications, such as parcel delivery, inspection, and aerial photography, in urban areas. However, drones usually use an electric system to power up the propulsion, communications, navigation, and flight control system, which means that it is not as reliable as the manned aircraft system and may result in failure during operation and then crash to the ground. At present, there is almost no extensive publication about the high-fidelity modeling used by drones to calculate the crash trajectory and point of crash. The experimental data for modeling and simulation verification of multirotor aircraft are limited. So far, crash trajectory prediction has been limited to point mass or ballistic methods, and these methods are usually only suitable for complete power failure and without any control system. This study intends to investigate the effects of different multirotor drones’ failure modes on its crash trajectory and crash area compared to the ballistic model by using ADAMS and MATLAB co-simulation methods. Conclusions from the study show the crash trajectory, flight distance, and impact speed of the drones under four failure modes, which are quite different from the ballistic trajectory. The findings can potentially contribute to better risk assessment of the multirotor drones for the urban environment operation. Submitted/Accepted version
- Published
- 2023
7. Simulation of the Effects of Backlash on the Performance of a Collaborative Robot: A Preliminary Case Study
- Author
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Roberto Guida, Andrea Raviola, Domenico Fabio Migliore, Andrea De Martin, Stefano Mauro, and Massimo Sorli
- Subjects
Collaborative robotics ,Health management ,High-fidelity modelling ,Backlash ,Diagnostics ,Industrial robots - Published
- 2022
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