基于发动机轴系扭振抑制的扭弯减振器分析

Analysis on Torsional-Bending Damper for Engine Crankshaft Based on Torsional Vibration Reduction

扭弯复合减振器能同时抑制扭转振动和弯曲振动,降低发动机噪声.以发动机轴系扭转振幅最小化为目标,研究了扭弯复合减振器的设计方法,并分析扭振减振器或弯振减振器参数偏离对扭转振幅曲线的影响.分析表明:增大扭振减振器惯量比、降低弯振减振器惯量比,能减小扭转振幅曲线的共振峰值;弯振减振器阻尼比和刚度偏离最佳参数后,能增大曲线共振峰值,但影响程度很小;扭振减振器阻尼比和扭转刚度的偏离能显著增大峰值.

The torsional-bending damper,including a torsional damper and a bending damper,plays an important role in restraining torsional and bending vibration of the crankshaft so as to lower noise. Aiming at minimizing the torsional amplitude,the method to design the torsional-bending damper was investigated,and the influence of the parameters＇ deviation on the torsional amplitude was analyzed. Calculation results show that increasing the torsional damper＇s interia ratio and decreasing the bending damper＇s interia ratio would reduce the maximum peak of the torsional amplitude magnification curve;the deviation of parameters of bending damper＇s damping ratio and stiffness can increase the resonant peak value at a small degree,the deviation of the torsional damper＇s damping ratio and stiffness,however,would increase the peak value significantly.