基于非线性微振动流体阻尼隔振器的Octo-strut隔振平台的动力学特性研究

Dynamic characteristics of the Octo-strut vibration isolation platform based on nonlinear fluid damping micro-vibration isolator

针对一种新型非线性微振动流体隔振器的Octo-strut平台进行研究,基于隔振器的非线性五参数模型及牛顿-欧拉方法建立了Octo-strut隔振平台的动力学模型,并对平台的振动耦合性、安全冗余性等动力学特性进行了理论分析和数值仿真验证。研究结果表明:隔振平台垂直平动z方向、绕垂向转动θs方向动力学特性独立,径向平动x方向与径向平动y方向相互垂直,径向平动x方向与绕径向转动θy方向、径向平动y方向与绕径向转动θx方向的动力学特性相互耦合。隔振平台具有振动耦合性、安全冗余性、非线性温变特性,在工程实际应用时应避免失效隔振器的出现并关注隔振器温变特性,以保证隔振的安全可靠性。

In this paper,an Octo-strut vibration isolation platform which is composed of a new type of nonlinear fluid micro-vibration isolators is studied.Based on the nonlinear five-parameter model of the isolator and the Newton-Eulerian method,a dynamic model of the Octo-strut vibration isolation platform is firstly constructed,and then the dynamic characteristics,e.g.,vibration coupling behavior and safety redundancy,are theoretically analyzed and numerically validated.The results show that the dynamic characteristics in the vertical translation direction z and the vertical rotation directionθz are independent,but the dynamic characteristics in the radical translation direction x and the radical rotation directionθy are coupled with each other,so are the radical translation direction y and the radical rotation directionθx,the direction x and direction y are perpendicular to each other.As the vibration isolation platform has vibration coupling behavior,safety redundancy and nonlinear temperature-dependent property,thus the occurrence of the failed isolator should be avoided,and the temperature-dependent characteristic should be paid attention to ensure the safety and reliability of the vibration isolation platform.