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149 results on '"Nasri, Rachid"'

1. Effect of elastic couplings on the dynamic behavior of transmission systems

Author

Bouslema, Marwa, Fakhfakh, Taher, Nasri, Rachid, and Haddar, Mohamed

Subjects
Coupled system, Receptance coupling method, Elastic coupling, Frequency Response Functions (FRFs), Torsional coupling stiffness, Translational coupling stiffness, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

The aim of the present work is to analyze the sensibility of an elastic coupling on the coupled Frequency Response Functions (FRFs) of transmission mechanical systems. The FRF of a linked system, such as a reducer stage, is determined by a receptance coupling (RC) method. The equilibrium and the compatibility conditions are applied.This method is investigated for different coupling models such as rigid and flexible. The proposed method is validated by a direct computation of the full system showing exact agreement.Afterward, the effect of a rigid and a joined system on the sub-structuring response FRFs is analyzed. The coupling models derived from literature review are discussed to show their effects on FRF. Although the coupling in question is considered to be a flexible interface in the aforementioned system, as revealed in the literature review, it introduces a translational and rotational damping and stiffness. So, the formulation of the RC is different from the standard approach. In order to achieve the aim of the present work, the effects of some important parameters such as translational and rotational coupling, shaft and bearing stiffness on the FRF are discussed. Some sensitivity of the proposed models are observed in relation to the coupling parameters.

Published
2022
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3. Investigation of the Aerodynamic Loads of Horizontal Axis Wind Turbines Blade

Author

Maktouf, Rania, Yangui, Majdi, Nasri, Rachid, Haddar, Mohamed, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Ben Amar, Mounir, editor, Ben Souf, Mohamed Amine, editor, Beyaoui, Moez, editor, Trabelsi, Hassen, editor, Ghorbel, Elhem, editor, Tounsi, Dhouha, editor, and El Mahi, Aberrahim, editor

Published
2024
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4. Numerical Study of Machining Vibration Effect on Machined Surface Roughness in Orthogonal Milling

Author

Baklouti, Wael, Mrad, Charfeddine, Nasri, Rachid, Haddar, Mohamed, Series Editor, Bartelmus, Walter, Series Editor, Chaari, Fakher, Series Editor, Zimroz, Radoslaw, Series Editor, Chu, Fulei, Editorial Board Member, Mba, David, Editorial Board Member, Galar, Diego, Editorial Board Member, Peng, Zhongxiao, Editorial Board Member, Akrout, Ali, editor, Abdennadher, Moez, editor, Feki, Nabih, editor, and Abbes, Mohamed Slim, editor

Published
2023
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5. Numerical Exploration of Machining Vibration Effect on Cutting Stability in Orthogonal Milling Using Cutting Forces

Author

Baklouti, Wael, Mrad, Charfeddine, Nasri, Rachid, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Haddar, Mohamed, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Walha, Lassaad, editor, Jarraya, Abdessalem, editor, Djemal, Fathi, editor, Chouchane, Mnaouar, editor, Aifaoui, Nizar, editor, Abdennadher, Moez, editor, and Benamara, Abdelmajid, editor

Published
2023
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8. Isotropic and Kinematic Hardening Laws: Plastic Behavior of Mild Steel Under Shear Tests

Author

Daghfas, Olfa, Znaidi, Amna, Nasri, Rachid, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, di Mare, Francesca, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Bouraoui, Tarak, editor, Benameur, Tarek, editor, Mezlini, Salah, editor, Bouraoui, Chokri, editor, Znaidi, Amna, editor, Masmoudi, Neila, editor, and Ben Moussa, Naoufel, editor

Published
2022
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12. Stability Analysis of One Degree of Freedom System Equipped with Friction Vibration Absorber

Author

Nasr, Aymen, Mrad, Charfeddine, Nasri, Rachid, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Kharrat, Mohamed, editor, Baccar, Mounir, editor, and Dammak, Fakhreddine, editor

Published
2021
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13. The Effect of Perturbation on the FRF Based Substructuring

Author

Bouslema, Marwa, Fakhfakh, Taher, Nasri, Rachid, Haddar, Mohamed, Chaari, Fakher, Series Editor, Haddar, Mohamed, Series Editor, Kwon, Young W., Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Barkallah, Maher, editor, Choley, Jean-Yves, editor, Louati, Jamel, editor, and Ayadi, Omar, editor

Published
2020
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18. Analysis of the Brownian Motion Approach for Ballistic Resistance Evaluation Using the Maximum Likelihood Inference.

Author

Tahenti, Beya, Coghe, Frederik, Ndindabahizi, Irène, and Nasri, Rachid

Subjects
BROWNIAN motion, PARAMETER estimation, MOTION analysis, DATABASES, PROBLEM solving
Abstract

Armor technologists' improvement of protection systems led to the design of complex systems. Given the risk factor on human life, increasing requirements on the ballistic resistance evaluation are imposed. Consequently, an increased effort is dedicated to estimating the perforation probability curve as a function of the bullet impact velocity. The main limitation of methods that fits a normal law to perforation velocities is their purely statistical character. A Brownian-based approach that couples the system response variability and physics was proposed using the Chi-square and Kolmogorov-Smirnov criterion function for model parameters estimation. One major limitation of this inference approach is the large experimental database required for its execution. The contribution of this paper is the introduction of the maximum likelihood inference for parameters estimation of the Brownian-based approach. The agreement between the obtained results and the experimental ones confirms the appropriateness of the likelihood inference to solve the studied problem. Moreover, the estimations uncertainty was analyzed and compared to the existing method ones. It was observed that the proposed model reduces the confidence intervals on key velocity estimations. Accordingly, the present work encourages the adoption of this proposed methodology in a laboratory context with a restrained sample size. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Mechanical Vibration Elimination Using Friction Absorber

Author

Nasr, Aymen, Mrad, Charfeddine, Nasri, Rachid, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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36. Mechanical Vibration Cancellation Using Impact Absorber

Author

Chehaibi, Kaouther, Mrad, Charfeddine, Nasri, Rachid, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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37. The Study of the Hardening Precipitates and the Kinetic Precipitation. its Influence on the Mechanical Behavior of 2024 and 7075 Aluminum Alloys Used in Aeronautics

Author

Ben Mohamed, Ahmed, Znaidi, Amna, Baganna, Moez, Nasri, Rachid, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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42. Damping in Bolted Structures

Author

Tleilia, Aymen, Nasri, Rachid, Chakhari, Jamel, Fakhfakh, Tahar, editor, Bartelmus, Walter, editor, Chaari, Fakher, editor, Zimroz, Radoslaw, editor, and Haddar, Mohamed, editor

Published
2012
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47. NUMERICAL COMPARATIVE INVESTIGATION ON MACHINING CHATTER PREDICTION IN ORTHOGONAL METAL TURNING AND MILLING.

Author

Baklouti, Wael, Mrad, Charfeddine, and Nasri, Rachid

Subjects
SURFACE topography, MILLING cutters, MACHINING, RAPID tooling, FRACTURE strength, ROUGH surfaces
Abstract

The chatter phenomenon is a huge obstacle for productivity in machining, since it limits the cutting conditions: speed, feed, and depth. It manifests during machining by a loud noise, a rapid tool wear, and a rough machined surface, it affects the whole cutting system: tool-workpiece-machine. This work aims to determine cutting stability charts in orthogonal metal milling, inspiring from orthogonal metal turning, considering various tool flexibilities: radial, transverse, and combined. The Abaqus software is adopted to conduct the numerical simulations. The strength and fracture of the workpiece obey to the Johnson-Cook laws. The tool-workpiece friction obey to the Coulomb law, and the thermal effect is considered. An explicit scheme and a Lagrangian formulation are retained for the material removal. Firstly, the milling tool is considered having radial flexibility, the cutting stability is studied using the tool accelerations caused by the cutting forces, and the surface topography. The arithmetic average roughness was also examined, basing on the workpiece nodes and the tool displacement. Secondly, the tool is considered having transverse flexibility, then combined flexibility: radial and transverse. Lastly, the results are contrasted to conclude on the milling process relatively to the turning process, taking into account the different flexibilities. [ABSTRACT FROM AUTHOR]

Published
2023

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