This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Gear Rattle Prediction Based on Compliance and Deformation of Gear Contact Points
Technical Paper
2016-01-1094
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Generally, the gear rattle noise prediction models are composed of the mass and stiffness elements. The proposals are about the gear inertia or backlash and the shaft inertia or stiffness, but there are many detailed designs in the same inertia, stiffness or backlash conditions. Therefore, these proposals can’t guide detailed designs. These models only investigate the rattle in the rotating degree, and ignore rattle contribution in the radical and axial directions. Those prediction models only consider one or several factors which affect the rattle noise performance. It is difficult to predict the influence of individual factor and multi-factors coupling on the gear rattle noise in a rattle simulation model. Those factors include the shape and size of the gear tooth, the center distance and un-parallelism between the input and output shaft, the variable gear meshing stiffness, the gear backlash in three directions changing with the gear meshing position, stiffness of the input shaft, the output shaft and the transmission housing, the bearing radical clearance, the shaft deformation, the torque of the input shaft, the vehicle driving resistance, the bearing resistance, the synchronizer resistance, the gear churning resistance, and the friction torque.
To solve the problems, gear meshing forces which are product of compliance and deformation of the gear contact points are used to build gear rattle noise prediction model. Firstly, compliance is obtained through finite element method in the model. Then the deformation is calculated by involute start angle on gear base circle, the tooth root and tip involute angle, the pressure angle, and the center distance between the input and output shaft. Subsequently, the gear meshing force is obtained through compliance multiplying by the deformation of the gear contact points. Finally, the model for the gear rattle prediction is built based on the gear meshing force. This rattle prediction model can guide the detailed designs including the gear shape and size, and the center distance between the input and output shaft. Rattle performance in the radial, axial and tangential directions can be investigated in this model. The individual and combined effect of above factors can be considered in this rattle model because those factors affect the compliance or deformation of the gear contact points. The rattle noise contribution order of the unloaded gears is obtained from the model. It is coincided with test result. This indicates that the rattle model is correct and can be used to predict rattle noise. Results show that the axis and radial rattle of the unload gears contributes significantly to the rattle noise, and its influence can’t be neglected. The reverse gears have the most contribution to rattle performance. Thus, those gears are the major directions for rattle performance optimization. The prediction model provides a rapid and economic method to solve the gear rattle noise problem.
Authors
Topic
Citation
Liao, F., Gao, W., Gu, Y., Kang, F. et al., "Gear Rattle Prediction Based on Compliance and Deformation of Gear Contact Points," SAE Technical Paper 2016-01-1094, 2016, https://doi.org/10.4271/2016-01-1094.Also In
References
- Fang Liao , Weimin Gao , Cheng Wang , and Junpeng Li Vibration Identification of Gearbox Housing by Modal Expansion and Radiation Sound Optimization Journal of Tongji University (Natural Science) 40 11 1698 1703 2012
- Weimin Gao and Fang Liao Rattle Noise Analysis and Optimization in Manual Transmission IEEE International symposium on instrumentation & measurement, sensor networks and automation Ottawa, P.R. Canada IEEE IMSNA 2014 12 2244 2248 2014
- Fang Liao , Weimin Gao , Yan Gu , and Fei Kang et al. Identification of Gear Rattle Vibration by Vibration Relative Approach Optics and Precision Engineering 23 12 3430 3438 2015
- Robinette , D. , Beikmann , R. , Piorkowski , P. , and Powell , M. Characterizing the Onset of Manual Transmission Gear Rattle Part II: Analytical Results SAE Int. J. Passeng. Cars - Mech. Syst. 2 1 1365 1376 2009 10.4271/2009-01-2069
- Kadmiri Y. , Rigaud E. , Perret-Liaudet J. and Vary L. Experimental and Numerical Analysis of Automotive Gearbox Rattle Noise Journal of Sound and Vibration 331 13 3144 3157 2012
- Barthod M. , Hayne B. , Tebec J. L. , and Pin J. C. Experimental Study of Gear Rattle Excited by A Multi-Harmonic Excitation Applied Acoustics 68 9 1003 1025 2007
- Wang M. Y. , Manoj R. and Zhao W. Gear Rattle Modeling and Analysis for Automotive Manual Transmissions Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 2001 215 241 2001
- Karaman A. and Singh R. Non-Linear Dynamics of A Spur Gear Pair Journal of Sound and Vibration 142 1 49 75 1990
- Tangasawi O. , Theodossiades S. , Rahnejat H. and Kelly P. Non-Linear Vibro-Impact Phenomenon Belying Transmission Idle Rattle Proceeding of Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222 1909 1923 2008
- Tangasawi O. , Theodossiades S. and Rahnejat H. Lightly Loaded Lubricated Impacts: Idle Gears Rattle Journal of Sound and Vibration 308 3 418 430 2007
- Theodossiades S. , Tangasawi O. and Rahnejat H. Gear Teeth Impacts in Hydrodynamic Conjunctions Promoting Idle Gear Rattle Journal of Sound and Vibration 303 3 632 658 2007
- Bhagate , R. , Badkas , A. , and Mohan , K. Driveline Torsional Analysis and Parametric Optimization for Reducing Driveline Rattle SAE Technical Paper 2015-01-2176 2015 10.4271/2015-01-2176
- Valdyn Valdyn User Manual Ricardo Corp. Ltd.
- Litvin Gear Geometry and Applied Theory Shanghai Shanghai Science Press 2008
- Lei Guo Study on Characteristics of Helical Gear Multi-gap Nonlinear Coupled System Dalian Dalian University of Technology 2010
- Cai. Y. Simulation on The Rotational Vibration of Helical Gears in Consideration of Tooth Separation Phenomenon ASME Journal of Mechanical Design 117 460 469 1995
- Jian Wang Study on Instantaneous Vibration of Motor Powertrain Mounting System of Vehicle Shanghai Tongji University 2009
- Chen , M. , Wang , D. , Lee , H. , Jiang , C. et al. Application of CAE in Design Optimization of a Wet Dual Cutch Transmission and Driveline SAE Int. J. Passeng. Cars - Mech. Syst. 7 3 1128 1137 2014 10.4271/2014-01-1755
- Liao , F. , Gao , W. , Gu , Y. , Kang , F. et al. Analysis of Gear Rattle Noise and Vibration Characteristics Using Relative Approaches SAE Technical Paper 2016-01-1121 2016 10.4271/2016-01-1121