1.College of mechanical and vehicle engineering, Chongqing University, Chongqing 400044, China;
2.Product Engineering department, MAGNA PT Powertrain (Jiangxi) Co., Ltd., Nanchang 330013, China;
3.College of vehicle engineering, Chongqing University of Technology, Chongqing 400054, China
Abstract:A transmission rattle bench that simulates the engine speed fluctuations was built. The housing vibration and the transient rotational signals of the gears of a dual-clutch transmission were measured to investigate the evolution of the rattle response and geartrain dynamics along with the varying input angular acceleration level and different preselection gears. According to the calculated results from a lumped parameter geartrain backlash-nonlinear dynamic model and the law of the gear meshing, a criterion for judging the gear motion state based on the characteristics of the angular acceleration amplitude of the gear’s characteristic frequency is proposed. The bench test results indicate that the preselection gear significantly varies the rattle response and gear pair dynamic behaviour in the DCT transmission. The DCT rattle response features a jump-up phenomenon once the input shaft angular acceleration level increases to a certain amplitude, a clear low-frequency dynamic coupling between the active and passive sub-gearboxes is clearly observed, and the rotational signal of the loaded gear shows significant multi-harmonic nonlinearity. The teeth separation and vibro-impact rattle of the loaded gear pair can be deduced based on the proposed criteria for the gear motion judgement. The dynamic coupling after the dynamic change in the geartrain considerably deteriorate the DCT rattle response. Finally, the dynamic coupling and rattle jump-up phenomenon are validated throughout the vehicle experiment.
周益1,2,黄斌2,石晓辉3,郭栋3,梅自元2,徐辉辉2. 预选挡对双离合变速器敲击响应与齿轮动力学影响的试验研究[J]. 振动与冲击, 2024, 43(10): 185-196.
ZHOU Yi1,2,HUANG Bin2,SHI Xiaohui3,GUO Dong3,MEI Ziyuan2,XU Huihui2. Experimental study on the effect of the preselection gear on the rattle dynamics analysis of a dual-clutch transmission. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(10): 185-196.
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