Self-excited vibration of driveline for vehicle launch

The launch shudder phenomenon induced by self-excited vibration of driveline was stud- ied with a compact car equipped with AMT as research object. The research showed that self-excited vibration was closely related with damping of driveline, the variation of friction coefficient, equiva- lent radius of friction plate and applied force of pressure plate. Six DOFs torsional vibration model of vehicle driveline was established according to the parameters of the certain compact car. The simula- tion was carried out and the result was compared with test data. It was found that the negative slope of friction coefficient with relative slip speed does not necessarily lead to self-excited vibration and the frequency of self-excited vibration on 1st gear is near to the 1st order of torsional natural frequen- cy. The influence of each viscous damping in driveline on self-excited vibration was analyzed by sim- ulation and the results showed that increasing the torsional dampings of half-axles and tires properly was effective to improve launch shudder phenomenon.

水润滑橡胶尾轴承鸣音试验研究

为了研究水润滑橡胶尾轴承鸣音产生的机理,在水润滑橡胶尾轴承鸣音台架模拟试验的基础上,结合橡胶尾轴承的摩擦特性,对试验结果进行了初步分析总结,揭示了各因素对水润滑橡胶尾轴承鸣音临界工况的影响规律。结果表明,水润滑橡胶尾轴承鸣音出现与否,主要取决于工作过程中轴承与轴颈的直接接触面积以及摩擦系数-速度曲线负斜率。