刚/柔混合建模的动力机械隔振系统特性分析

Analysis on Characteristic of Vibration Isolation System of Power Machinery Mixed Rigid-body Models and Flexible-body Models

基于ADAMS仿真平台,运用多体动力学和有限元技术,提出刚/柔混合的动力机械隔振系统的建模方法,建立某四缸柴油机和简化的矩形平板为其柔性基础的隔振系统的动力学仿真模型。对该模型进行仿真计算得到的系统激振力与理论计算十分吻合。特性分析表明,对于刚度较小的隔振器,系统自振频率会成为导致隔振器支承力变化的主要因素,而对于刚度较大的隔振器,系统的低阶固有频率和激振频率均对隔振器支承力的变化产生重要影响。

Based on ADAMS, a method mixed rigid bodies and flexible bodies was presented for vibration isolation system of power machinery. Multi-body dynamics and finite element method were applied in the modeling method. A specific model contained a four-cylinder diesel and a simplified rectangular plate was built. Overall characteristic analysis showed that the characteristics of system＇s vibration were influenced by the stiffness of base and vibration isolator. Natural frequency of power machinery＇s isolation system would be main influencing factor to change of vibration isolator＇s bearing force when stiffness of vibration isolator was lesser. Low order natural frequency of power rnachinery＇s isolation system and frequency of exciting force all had important influence to change of vibration isolators bearing force when stiffness of vibration isolator was bigger.