金属橡胶消极减振系统复杂响应特性研究

摘要

The complex response of a metal-rubber vibration isolation system was studied.Its hysteretic restoring force was simplified with the linear equivalence method based on the double broken-lines constitutive relation for the shock absorber.The mathematical model of the system was built,and its state equation was derived.The dynamic tests of the shock absorber were done,and the physical parameters of the shock absorber were identified by using the test data.The numerical simulation of the system was done by using the identified physical parameters,the response bifurcation diagrams of the system versus excitation force amplitude and frequency were plotted,and the parameters'intervals of the system to cause chaos vibration were determined.The complex response characteristics of the system with single frequency input and multi-frequency or broadband frequency output were analyzed.Finally,the analysis results were verified with vibration tests.%对金属橡胶非线性消极减振系统的复杂响应特性进行了研究，基于减振器的双折线本构关系对隔振器的迟滞恢复力进行了线性等效，推导了减振系统的状态方程；对减振器进行了动态加载实验，利用实验数据识别得到了减振器的实际物理参数；利用辨识得到的有量纲的物理参数对系统进行数值仿真，绘制了系统随激励幅值和频率变化的分岔图，确定了系统产生混沌振动的参数区间，分析了金属橡胶减振系统的单频输入多频甚至宽频输出的复杂响应特性，并通过振动实验进行了验证。