基于频响函数法的曲轴轴系扭振分析与控制

Analysis and Control of Crankshaft Torsional Vibration Based on Frequency Response Functions

基于原点频响函数法对曲轴轴系匹配三种不同TVD时的扭振进行计算,可以快速预测TVD减振效果。首先引入扭转减振器减振原理;其次介绍集总参数有限元法计算扭振的方法;然后通过扭转模态识别曲轴轴系的模态频率,通过频响函数结果判别曲轴轴系在单位激励力矩作用下扭振幅值的大小;最后,试验测试曲轴安装TVD位置处的扭振加速度,并和仿真进行对比。结果发现,频响函数法计算的扭振幅值曲线和测试结果趋势相同,且对这三种TVD降低车内噪声的效果进行了比较。

The torsional vibrations of a crankshaft with three different TVDs are computed based on the origin frequency response function method.This method can quickly predict TVD damping effect.First of all,the torsional vibration damping principle is elaborated and the finite element method for torsional vibration computation based on the integrated parameters is introduced.Then,the modal frequencies of the crankshaft are identified through the torsional modals.And the amplitudes of the torsional vibration of the crankshaft system under the unit torque excitation are distinguished based on the results of the frequency response function.Finally,the torsional vibration acceleration of the crankshaft located in TVD is tested and compared with the simulation results.It is found that the curves of the torsional vibration amplitude by frequency response function method and by the testing are consistent.Furthermore,the interior noise reduction effects of the three kinds of TVD are summarized.