飞轮壳NVH性能研究与改进

摘要

Simulations on a flywheel cover are conducted by adopting FEM, multi-body dynamics and BEM methods to analyze its NVH performance. Firstly the finite element model for flywheel cover is set up and validated by modal test. Multi-body dynamics technique is used to calculate the vibration response of the coupled model for the cylinder block and crankshaft-connecting rod mechanism of a six-cylinder diesel engine with the load spectra transferred to flywheel end from cylinder block obtained. The frequency response characteristics of flywheel cover are worked out by finite element analysis. Then the noise characteristics of flywheel cover are predicted with its boundary element model. Finally the measures for reducing flywheel cover noise are studied. The results show that the method adopted can effectively suppress the radiated noise from cover surface.%采用有限元/多体动力学/边界元等方法对某飞轮壳进行仿真,以分析其NVH性能.首先建立飞轮壳有限元模型并通过模态试验验证其准确性;采用多体动力学方法计算六缸柴油机缸体与曲柄连杆机构耦合模型的振动响应,得到缸体传递到飞轮端的载荷频谱,通过有限元分析获得飞轮壳的频率响应特性,然后在边界元模型中预测出飞轮壳的噪声特性,最后研究了飞轮壳降噪的方法.结果表明,采用的方法能有效抑制飞轮壳的表面辐射噪声.