磁流变减振系统的双谱分析研究

Bispectrum analysis of magnetorheological damping system

减振系统一般由多个部件组成,磁流变效应又是非线性的,磁流变减振系统存在明显的非线性特征,非线性特性分析对系统的改进设计及措施补偿具有重要意义.双谱分析是一种新的、功能强的信号处理技术,能定量地描述系统非线性耦合度,抑制高斯噪声且保持相位信息.实验中,使用采样数据建立自回归模型(AR模型),运用双谱分析方法研究磁流变减振系统的非线性规律.研究表明,双谱分析磁流变减振的方法是完全可行的,有效的.

The magnetorheological damping system is nonlinear, which is made up of controllable producing device, signal collecting device, computer software for dynamic analysis, magnetorheological damper etc. It is important to analyze the nonlinear system for structure innovation or compensation. Bispectrum analysis was taken as a new powerful technique in signal processing, which could describe nonlinear coupling, restrain Gaussian noise and reserve phase component. AR bispeetrum were put forward for investigating the dynamic characteristics of the magnetorheological vibrant device. When a zero mean and non-Gaussian white noise interferes with the device, a time series model, proposed as AR （autoregressive） model, was conducted by using the sampled experimental data. The experimental results showed that bumps of the bispectrum was decreased with increasing the system inputting currents, and the distribution of the values and phase were become harmonious. It was indicated that the bispectrum spectrum analysis methods were feasible and effective for investigation of magnetorheological damping device.