弱非线性系统的辨识方法

Identification Method for Small Nonlinear System

汽车前轮的独立悬挂系统是由摆臂机构、扭杆弹簧、阻尼器和悬挂质量组成的非线性系统。它是含有刚度非线性和阻尼非线性的弱非线性系统。本文介绍这种系统的频响函数测量和在随机激励下的平均线性化方法。作者分析了这个振动系统的超低频特性,给出了在不同激励信号电平下测得的频响函数曲线和平均次数之间的关系以及模态参数辨识结果。

The independent suspension system of autornobill front wheels is a nonlinear system that consists of swing arm mechanism,torsion rod spring/damper,etc.This system is of a small nonlinearity containing stiff nonlinear and damper nonlinear one.This paper 'described the measurement of frequency response function (FRF) of this system and the average linearization method under random exciting condition.The paper also analysed the ultra low frequency characteristics of this vibration system and gave a relation between FRF curves of various exciting signal levels and average times,and the modal parameter identification results.