In order to analyze manual transmission gear rattle, multi-body dynamics model of automotive manual transmission gear-train was established, considering the time-varying mesh stiffness, backlash, velocity fluctuation of the input shaft and drag torque resulting from oil churning, tooth friction and friction between the output shaft and the loose gears inner surface. Then the relative motion between meshing gear teeth, angular acceleration and meshing forces of the loose gears and engaged gears were obtained, and also dynamical bearing loads. They were compared with the results without considering drag torque. It shows that drag torque can change the state of motion of the loose gears, and significantly reduce the Meshing forces of them. The vibration response of transmission housing was simulated using the dynamical bearing loads in the second gear ratio. And the simulation result of transmission housings vibration acceleration was compared with transmissions surface vibration experiments. It verified the results of the dynamic characteristics of the dynamic simulation model
WANG Lian-sheng,HAO Zhi-yong,ZHENG Kang,LIU Gong-wen. Simulation and experiment on transmission gear rattle considering drag torque. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2014, 48(5): 911-916.
［1］ 田雄,李宏成,吕先锋,等.基于传递路径试验分析的变速器敲击噪声优化［J］.振动工程学报,2010,23(6)：632647．
TIAN Xiong, LI Hong-cheng, LV Xian-feng,et al. A study on transmission rattle noise optimization based on transfer path test analysis ［J］. Journal of Vibration Engineering, 2010,23(6)：632647．
［2］ ROCCA E,RUSSO R. Theoretical and experimental investigation into the influence of the periodic backlash fluctuations on the gear rattle ［J］. Journal of Sound and Vibration， 2011,330:47384752．
［3］ BARTHOD M,HAYNE B,TEBEC J L,et al. Experimental study of gear rattle excited by a multi-harmonic excitation ［J］. Applied Acoustics, 2007, 68: 9821002．
［4］ SEETHARAMAN S,KAHRAMAN A,MOORHEAD M D. Oil churning power losses of a gear pair: experiments and model validation ［J］. Transactions of the ASME, Journal of Tribology， 2009, 131(2), 022202．
［5］ 滕瑞静,张余斌,周晓军,等.考虑弹流效应的斜齿轮振动仿真与试验［J］.内燃机学报,2012,30(3)：284287．
TENG Rui-jing, ZHANG Yu-bin, ZHOU Xiao-jun,et al. Simulation and experiment on vibration of helical gear transmission considering EHD ［J］. Transactions of CSICE, 2012,30(3)：284287．
［6］ RUSSO R,BRANCATI R,ROCCA E. Experimental investigations about the influence of oil lubricant between teeth on the gear rattle phenomenon ［J］. Journal of Sound and Vibration, 2009,321:647661．
［7］ 郭磊. 车用动力总成结构振动噪声的虚拟预测分析技术研究［D］. 杭州：浙江大学,2009．
GUO Lei. Investigation on Powertrain Structures Vibration and Noise Performance Based on Virtual Forcast Technology ［D］. Hangzhou: Zhejiang University, 2009．
［8］ ROBINETTE D,BEIKMANN R S,PIORKOWSKI P,et al. Characterizing the onset of manual transmission gear rattle part i-experimental results ［J］. SAE Paper，DOI:10.4271/2009-01-2068.
［9］ 李润方, 王建军. 齿轮系统动力学——振动、冲击、噪声［M］.北京:科学出版社,1997．
［10］ 彭国民,余波,马小英. 动力总成NVH分析中齿轮啮合特性研究［J］.振动工程学报,2010, 23（6）：681686．
PENG Guo-min, YU Bo, MA Xiao-ying. Gear meshing characteristics of powertrain NVH analysis ［J］. Journal of Vibration Engineering. 2010, 23(6):681686．
［11］ TANGASAWI O,THEODOSSIADES S, RAHNEJAT H. Lightly loaded lubricated impacts: Idle gear rattle ［J］. Journal of Sound and Vibration, 2007, 308: 418430．
［12］ CRUZ M D L,THEODOSSIADES S,RAHNEJAT H,et al. Numerical and experimental analysis of manual transmissions - gear rattle ［J］. SAE Paper, DOI:10.4271/2009-01-0328．
