局部非线性刚度阻尼系统参数识别的一种新方法

A New Approach on Parameter Identification in Localized Nonlinear Stiffness and Damping System

研究了具有平方非线性刚度和平方非线性阻尼的两自由度局部非线性振动系统,采用空间法来识别该系统模型的参数。利用该方法对非线性频响函数进行估计,并利用最小二乘法对模型的非线性刚度系数和非线性阻尼系数进行了优化,实验结果表明了该方法的可行性,在识别和优化汽车等局部非线性系统的物理参数方面具有一定的参考价值。

2 -DOF localized nonlinear vibrating system with quadratic nonlinear stiffness and damping was studied, spatial approach which was used to parametrically identify the vibration model was presented, by which linear and nonlinear frequency response function was estimated, and nonlinear stiffness coefficient and damping coefficient of the model were optimized by least square method in this paper. The feasibility of the approach was validated by the experimental result, which had some referenced values in identifying and optimizing the parameters of localized nonlinear vibrating system.