柔性基础内燃机被动隔振系统的建模与仿真

以多体动力学为基础,结合有限元技术和实体建模技术,建立柔性基础内燃机被动隔振系统刚/柔混合仿真模型。并对支承在柔性平板结构上的某四缸柴油机隔振系统进行动力学仿真计算,静平衡及激振力仿真结果均与理论计算十分吻合。通过改变柔性平板支承刚度来改变柔性基础的边界条件,进一步获得不同刚度条件柔性基础上内燃机隔振系统的隔振特性。通过比较柔性基础上隔振器支承力和刚性基础上隔振器支承力的变化,结果表明：柔性基础对隔振器支承力有重要影响,受柔性基础弹性影响的系统自振有可能成为影响支承力变化的主要因素。

Modeling and simulation of passive vibration isolation system of combustion engine with flexible base

Based on multi-body dynamics,finite element method and solid modeling technology,a dynamic model combined rigid bodies and flexible bodies about passive vibration isolation system of combustion engine with flexible base was built.A simulation analysis was done for a passive vibration isolation system of four-cylinder diesel supported on a flexible flat plate.Simulation result showed static balance and exciting force were the same with theory calculation.Through changing support stiffness between flexible flat plate and ground,boundary condition of flexible base could be changed.And the characteristics of vibration isolation were obtained when combustion engine＇s flexible base had different stiffness.Compared bearing force of vibration isolator on flexible base with bearing force on rigid base,the results could be gotten that flexible base had important influence to bearing force of vibration isolator and free vibration influenced by base＇s flexibility might become main factor to influence change of vibration isolator＇s bearing force.