柔性基础非线性隔振系统动力学特性分析  

DYNAMIC CHARACTERISTICS ANALYSIS OF FLEXIBLE FOUNDATION VIBRATION ISOLATION SYSTEM

作　　者：张道坤[1] 霍睿[1] 李淑颖[1] 王志东[1] 

机构地区：[1]山东大学机械工程学院山东大学高效洁净机械制造教育部重点实验室,济南250061

出　　处：《机械强度》2016年第3期442-446,共5页Journal of Mechanical Strength

摘　　要：建立了隔振对象-非线性隔振支承-柔性基础组成的耦合系统的一般性动力学模型,研究了应用振动功率流对非线性隔振系统进行效果分析的计算方法,给出了动力学方程初值问题表达式;并且基于Runge-Kutta法以某小型无人机的发动机隔振系统为算例,对几种非线性隔振器的隔振效果进行了数值仿真和分析。研究表明并联刚度隔振器和分段线性隔振器可有效减少隔振系统功率流的传递。A general coupled dynamic model of the isolation system is established,which is composed of isolation object,nonlinear isolators and flexible foundation. By transforming the system dynamic equation into an expression of initial value problem of differential equation,the calculation method of transmitted power flow is deduced,which is put forward to evaluation and analysis of isolation effectiveness. Based on an example of vibration isolation system of a small unmanned aircraft engine,the Runge-Kutta method is applied to simulation and estimation of power flow transmitted through nonlinear isolators with hypothetical different stiffness characteristics. It is presented that properly designed nonlinear isolators such as endowed with paralleled negative stiffness or piecewise linear stiffness could effectively reduce the power flow transmission of isolation system.

关 键 词：非线性 隔振 柔性基础 功率流 

分 类 号：TB533.1[理学—物理]