二阶线性系统调参共振的特征信号检测

Characteristic Signal Detection Based on the Parameter-Tuned Resonance of the Second-Order Linear System

以二阶线性系统为信息检测处理模型,提出二阶线性系统调参共振的特征信号检测方法。该方法利用线性系统的共振特性,得到系统响应最大值随固有频率变化的特性曲线,根据曲线中的极大值即可识别噪声中的特征信号。仿真和转子故障诊断实验表明,所提出的方法原理简单,能为实际信号检测与处理提供一种可行实用的方法。

In this paper,a characteristic signal detection method based on the parameter-tuned resonance of a second-order linear system is proposed.The second-order linear system is taken as a signal detection model,and its resonance characteristics are used to obtain the characteristic curve for describing the change law between the maximal value of system response and the natural frequency.According to the maximum value of the curve,we can identify the characteristic signals from the noise background.Simulation analysis and the experiment of rotor fault diagnosis indicate that the principle of the presented method is simple,and that it may provide a practical method for signal detection and processing.