文档介绍：马氏距离在模拟电路硬故障检测中的应用研究*
秦庆强1 张晓安2 李艾华1 杨钊3
(1. 第二炮兵工程学院502教研室, 西安 710025; 2. 第二炮兵装备部, 北京 100085;
3. 第二炮兵驻北京地区专用装备代表室, 北京 100085)
摘要: 针对模拟电路硬故障检测问题, 提出了一种基于马氏距离的快速检测算法, 并利用pspice电路仿真软件对一个二阶滤波电路进行了电路建模及故障检测仿真。在pspice环境下, 进行含容差待测电路无故障和各故障模式下的蒙特卡洛仿真, 选取输出电压作为采样点, 利用输出电压的小波分解系数求出无故障态和各故障模式下的时-频马氏距离, 并以此作为电路故障判据。matlab下的计算结果显示, 这种故障检测算法对模拟电路硬故障具有良好的检测能力, 故障诊断正确率可达92%以上, 且具有算法简单、计算量小的优点。
关键词: 模拟电路; 硬故障检测; 马氏距离; 多层小波分解; pspice
中图分类号: TP391 文献标识码: A 国家标准学科分类代码:
Research on the application of Mahalanobis distance
in catastrophic faults detection of analog circuits
Qin Qingqiang1 Zhang Xiaoan2 Li Aihua1 Yang Zhao3
(1. 502 Staff Room, the Engineering College of Second Artillery, Xi’an Shaanxi 710025
2. The Equipment Department of Second Artillery, Beijing 100085
3. The Special Equipment Military Representative Office of Second Artillery at Beijing, Beijing 100085)
Abstract: Aiming at catastrophic fault fast detection of analog circuit, a new algorithm based on MAHALANOBIS distance is proposed in this paper. Besides, a simulation of circuit modeling and fault detection is made in pspice for the second order filter circuit. A Monte Carlo simulation is made for the circuit with tolerance in pspice. And the output voltage waves of both fault-free and faulty circuit are sampled and posed by wavelet. And the coefficients of responses are used to get the MAHALANOBIS distances