摘要
非线性电路系统在故障前后其非线性传递特性往往会发生明显的改变,通过比较系统正常状态下的频域特征与当前工作状态下的频域特征就可以判断系统是否处于故障状态。系统的非线性传递特性在频域的表现是广义频率响应方程GFRFs及非线性输出频率响应方程NOFRFs。基于NOFRFs理论对多级级联模拟电路中的非线性故障进行定位的方法作了具体介绍。并通过使用不同的激励信号激励系统,说明了激励信号的选择对故障诊断的影响。
When a nonlinear circuit had some faults,its nonlinear transfer characteristics would obviously change,therefore,systems health can be determined through comparing the nonlinear characteristics between the current work state and the normal state of the system.The transfer characteristic of a nonlinear system in frequency domain is referred to as Generalized Frequency Response Functions（GFRFs） or Nonlinear Output Frequency Response Functions（NOFRFs）.A NOFRF-based method for fault diagnosis of cascading analog circuit systems is introduced in this article.Different stimuli were used to show the effects of the choice of stimuli to fault diagnosis.
出处
《机电工程技术》
2012年第8期151-155,共5页
Mechanical & Electrical Engineering Technology
关键词
非线性
故障定位
NOFRFs
中频放大电路
nonlinearity
fault location
NOFRFs
IF amplification detection circuitry
