The Experts below are selected from a list of 10275 Experts worldwide ranked by ideXlab platform
Mohamed Haddar - One of the best experts on this subject based on the ideXlab platform.
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Topological modeling of a one stage Spur Gear transmission
Chinese Journal of Mechanical Engineering, 2014Co-Authors: Mariem Miladi Chaabane, Alain Rivière, Chafik Karra, Régis Plateaux, Jean-yves Choley, Mohamed HaddarAbstract:Finding a basis of unification for the modeling of mechatronic systems is the search subject of several works. This paper is a part of a general research designed to the application of topology as a new approach for the modeling of mechatronic systems. Particularly, the modeling of a one stage Spur Gear transmission using a topological approach is tackled. This approach is based on the concepts of topological collections and transformations and implemented using the MGS(modeling of general systems) language. The topological collections are used to specify the interconnection laws of the one stage Spur Gear transmission and the transformations are used to specify the local behavior laws of its different components. In order to validate this approach, simulation results are presented and compared with those obtained with MODELICA language using Dymola solver. Since good results are achieved, this approach might be used as a basis of unification for the modeling of mechatronic systems.
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A Polynomial Chaos Method for the Analysis of Uncertain Spur Gear System
Mechatronic Systems: Theory and Applications, 2014Co-Authors: Ahmed Guerine, Yassine Driss, Moez Beyaoui, Lassaad Walha, Tahar Fakhfakh, Mohamed HaddarAbstract:This chapter presents a dynamic behavior of a Spur Gear system with uncertainty associated to friction coefficient. Moreover, the friction coefficient admits some dispersion due to the manufacturing processes. Therefore, it becomes necessary to take this uncertainty into account in the stability analysis of a Spur Gear system. The proposed method proves to be interesting alternative to the classic methods such as parametric studies. Polynomial chaos approach is a more efficient probabilistic tool for uncertainty propagation.
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Nonlinear modeling and simulation of Spur Gear with defected bearings
Multidiscipline Modeling in Materials and Structures, 2012Co-Authors: Mohamed Taoufik Khabou, Taissir Hentati, Mohamed Slim Abbes, Fakher Chaari, Mohamed HaddarAbstract:Purpose – The aim of this paper is to present a theoretical model to simulate the dynamic behavior of a Spur Gear, taking into account its ball bearings defects.Design/methodology/approach – The proposed model is based on the implicit Newmark‐β with Newton‐Raphson numerical integration technique in order to analyze the impact of the worn bearings on the non linear dynamic behavior of one stage Spur Gear transmission system.Findings – The dynamic behavior of Spur Gear is studied taking into account ball bearings defects thanks to the proposed model.Originality/value – A new numerical model is proposed to simulate the dynamic behavior of rotating Spur Gear system taking into account both waviness and backlash defects.
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Influence of the Acyclism on the Dynamics of a Spur Gear System
Condition Monitoring of Machinery in Non-Stationary Operations, 2012Co-Authors: Noussa Bouchaala, Tahar Fakhfakh, Mohamed Taoufik Khabou, Fakher Chaari, Mohamed HaddarAbstract:The aim of paper is to study the dynamic behavior of a single stage Spur Gear reducer in transient regime. The Gear excitation is the result of the motor torque variation in addition to the fluctuation of meshing stiffness due to the variation of input rotational speed. Then, the dynamic response is solved using implicit type numerical integration technique Newmark-β. A parameter study is made on Spur Gear powered by four strokes four cylinders diesel engine. Dynamic responses come to confirm a significant influence of the transient regime on the dynamic behavior of a Gear set.
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study of a Spur Gear dynamic behavior in transient regime
Mechanical Systems and Signal Processing, 2011Co-Authors: Mohamed Taoufik Khabou, Tahar Fakhfakh, Fakher Chaari, Noussa Bouchaala, Mohamed HaddarAbstract:Abstract In this paper the dynamic behavior of a single stage Spur Gear reducer in transient regime is studied. Dynamic response of the single stage Spur Gear reducer is investigated at different rotating velocities. First, Gear excitation is induced by the motor torque and load variation in addition to the fluctuation of meshing stiffness due to the variation of input rotational speed. Then, the dynamic response is computed using the Newmark method. After that, a parameter study is made on Spur Gear powered in the first place by an electric motor and in the second place by four strokes four cylinders diesel engine. Dynamic responses come to confirm a significant influence of the transient regime on the dynamic behavior of a Gear set, particularly in the case of engine acyclism condition.
A Kahraman - One of the best experts on this subject based on the ideXlab platform.
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Influence of indexing errors on dynamic response of Spur Gear pairs
Mechanical Systems and Signal Processing, 2015Co-Authors: Murat Inalpolat, M. Handschuh, A KahramanAbstract:Abstract In this study, a dynamic model of a Spur Gear pair is employed to investigate the influence of Gear tooth indexing errors on the dynamic response. This transverse-torsional dynamic model includes periodically-time varying Gear mesh stiffness and nonlinearities caused by tooth separations in resonance regions. With quasi-static transmission error time traces as the primary excitation, the model predicts frequency-domain dynamic mesh force and dynamic transmission error spectra. These long-period quasi-static transmission error time traces are measured using unity-ratio Spur Gear pairs having certain intentional indexing errors. A special test setup with dedicated instrumentation for the measurement of quasi-static transmission error is employed to perform a number of experiments with Gears having deterministic spacing errors at one or two teeth of the test Gear only and random spacing errors where all of the test Gear teeth have a random distribution of errors as in a typical production Gear.
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A tribo-dynamic model of a Spur Gear pair
Journal of Sound and Vibration, 2013Co-Authors: A KahramanAbstract:Abstract In this study, a tribo-dynamics model for Spur Gear pairs is proposed. The model couples a mixed elastohydrodynamic lubrication model of a Spur Gear pair with a transverse–torsional dynamic model. The lubrication model provides the dynamic model with friction forces and moments that couple the vibrations of the Gears along the off-line-of-action direction to other Gear vibrations. In addition, it predicts damping coefficient at the Gear mesh in a physics-based manner from the energy loss associated with viscous shearing across the fluid film. In return, the dynamic model predicts the dynamic tooth forces and surface velocities to be used in the lubrication model. An iterative computational scheme is proposed to implement the lubrication and dynamics models simultaneously to couple tribological and dynamic behaviors of a Spur Gear pair fully. An example Gear pair is analyzed using the proposed model to demonstrate this two-way relationship and quantify the impact of operating conditions, surface roughness and lubrication characteristics on the tribo-dynamics response.
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effect of involute tip relief on dynamic response of Spur Gear pairs
Journal of Mechanical Design, 1999Co-Authors: A Kahraman, G W BlankenshipAbstract:The influence of Gear tooth flank modifications in the form of linear involute tip relief on the torsional vibration behavior of a Spur Gear pair is investigated by using an experimental test stand. Measured dynamic transmission error (DTE) values are compared and a family of forced response curves is presented. Guidelines for the design of quiet Spur Gear sets are also given.
Mohamed Taoufik Khabou - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear modeling and simulation of Spur Gear with defected bearings
Multidiscipline Modeling in Materials and Structures, 2012Co-Authors: Mohamed Taoufik Khabou, Taissir Hentati, Mohamed Slim Abbes, Fakher Chaari, Mohamed HaddarAbstract:Purpose – The aim of this paper is to present a theoretical model to simulate the dynamic behavior of a Spur Gear, taking into account its ball bearings defects.Design/methodology/approach – The proposed model is based on the implicit Newmark‐β with Newton‐Raphson numerical integration technique in order to analyze the impact of the worn bearings on the non linear dynamic behavior of one stage Spur Gear transmission system.Findings – The dynamic behavior of Spur Gear is studied taking into account ball bearings defects thanks to the proposed model.Originality/value – A new numerical model is proposed to simulate the dynamic behavior of rotating Spur Gear system taking into account both waviness and backlash defects.
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Influence of the Acyclism on the Dynamics of a Spur Gear System
Condition Monitoring of Machinery in Non-Stationary Operations, 2012Co-Authors: Noussa Bouchaala, Tahar Fakhfakh, Mohamed Taoufik Khabou, Fakher Chaari, Mohamed HaddarAbstract:The aim of paper is to study the dynamic behavior of a single stage Spur Gear reducer in transient regime. The Gear excitation is the result of the motor torque variation in addition to the fluctuation of meshing stiffness due to the variation of input rotational speed. Then, the dynamic response is solved using implicit type numerical integration technique Newmark-β. A parameter study is made on Spur Gear powered by four strokes four cylinders diesel engine. Dynamic responses come to confirm a significant influence of the transient regime on the dynamic behavior of a Gear set.
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study of a Spur Gear dynamic behavior in transient regime
Mechanical Systems and Signal Processing, 2011Co-Authors: Mohamed Taoufik Khabou, Tahar Fakhfakh, Fakher Chaari, Noussa Bouchaala, Mohamed HaddarAbstract:Abstract In this paper the dynamic behavior of a single stage Spur Gear reducer in transient regime is studied. Dynamic response of the single stage Spur Gear reducer is investigated at different rotating velocities. First, Gear excitation is induced by the motor torque and load variation in addition to the fluctuation of meshing stiffness due to the variation of input rotational speed. Then, the dynamic response is computed using the Newmark method. After that, a parameter study is made on Spur Gear powered in the first place by an electric motor and in the second place by four strokes four cylinders diesel engine. Dynamic responses come to confirm a significant influence of the transient regime on the dynamic behavior of a Gear set, particularly in the case of engine acyclism condition.
M A Bhutta - One of the best experts on this subject based on the ideXlab platform.
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near net shape forging of Spur Gear forms an analysis and some experiments
International Journal of Mechanical Sciences, 1996Co-Authors: N R Chitkara, M A BhuttaAbstract:Abstract The paper presents the results of an experimental investigation carried out in quasi-static incremental upset-forging of Spur Gear forms around the periphery of initially solid cylindrical billets, the outer radius of each of which was of the same size as the radius of the dedendum circle of the Spur Gear to be forged. The punch or die used was of the same size and shape and had the same number of teeth at its circumference as that in the female stationary die and corresponds to the shape and size of the Gear to be forged in each case. For the analysis an upper bound elemental technique previously applied to spline forging was first modified for the tapered teeth and was subsequently adopted to the analysis of forging Spur Gear forms having the actual profile teeth around its circumference each with the pressure angle of 14½°. The results of theoretical investigations presented here are confirmed with experiments and are compared with the existing upper bound analysis.
Fakher Chaari - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear modeling and simulation of Spur Gear with defected bearings
Multidiscipline Modeling in Materials and Structures, 2012Co-Authors: Mohamed Taoufik Khabou, Taissir Hentati, Mohamed Slim Abbes, Fakher Chaari, Mohamed HaddarAbstract:Purpose – The aim of this paper is to present a theoretical model to simulate the dynamic behavior of a Spur Gear, taking into account its ball bearings defects.Design/methodology/approach – The proposed model is based on the implicit Newmark‐β with Newton‐Raphson numerical integration technique in order to analyze the impact of the worn bearings on the non linear dynamic behavior of one stage Spur Gear transmission system.Findings – The dynamic behavior of Spur Gear is studied taking into account ball bearings defects thanks to the proposed model.Originality/value – A new numerical model is proposed to simulate the dynamic behavior of rotating Spur Gear system taking into account both waviness and backlash defects.
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Influence of the Acyclism on the Dynamics of a Spur Gear System
Condition Monitoring of Machinery in Non-Stationary Operations, 2012Co-Authors: Noussa Bouchaala, Tahar Fakhfakh, Mohamed Taoufik Khabou, Fakher Chaari, Mohamed HaddarAbstract:The aim of paper is to study the dynamic behavior of a single stage Spur Gear reducer in transient regime. The Gear excitation is the result of the motor torque variation in addition to the fluctuation of meshing stiffness due to the variation of input rotational speed. Then, the dynamic response is solved using implicit type numerical integration technique Newmark-β. A parameter study is made on Spur Gear powered by four strokes four cylinders diesel engine. Dynamic responses come to confirm a significant influence of the transient regime on the dynamic behavior of a Gear set.
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study of a Spur Gear dynamic behavior in transient regime
Mechanical Systems and Signal Processing, 2011Co-Authors: Mohamed Taoufik Khabou, Tahar Fakhfakh, Fakher Chaari, Noussa Bouchaala, Mohamed HaddarAbstract:Abstract In this paper the dynamic behavior of a single stage Spur Gear reducer in transient regime is studied. Dynamic response of the single stage Spur Gear reducer is investigated at different rotating velocities. First, Gear excitation is induced by the motor torque and load variation in addition to the fluctuation of meshing stiffness due to the variation of input rotational speed. Then, the dynamic response is computed using the Newmark method. After that, a parameter study is made on Spur Gear powered in the first place by an electric motor and in the second place by four strokes four cylinders diesel engine. Dynamic responses come to confirm a significant influence of the transient regime on the dynamic behavior of a Gear set, particularly in the case of engine acyclism condition.
