文档介绍：一种容差模拟电路故障诊断的新方法
叶笠王厚军田书林
(电子科技大学自动化工程学院, 成都 610054)
摘要: 以故障字典法和模糊理论为基础, 针对经典故障字典不能对元件参数故障(软故障)实施诊断以及由于元件容差的影响而难以实现故障精确诊断的问题, 以节点电压灵敏度为关键量建立了模糊规则字典和节点电压增量比向量字典, 并以此二字典为基础设计了新的诊断系统。使用该系统不但能够诊断电路硬故障, 而且还能够诊断每一元件的所有软故障。对于故障元件, 在定位的同时还能判断出其参数的改变方向。新的诊断方法有诊断范围宽、测前模拟次数少、占用存储空间小、计算复杂度小的特点。实验结果证明了新方法对含容差模拟电路故障诊断的有效性。
关键词: 故障字典;容差;节点电压灵敏度;电压增量比向量;模糊
中图分类号: TP206 文献标识码: A 国家标准学科分类代码: 510
A new approach for analog fault diagnosis with tolerance
Ye Li Wang Houjun Tian Shulin
(School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China)
Abstract: This paper addresses itself to analog circuit diagnosis by means of fault dictionary and fuzzy technique. To e the two major limitations of the classical fault dictionaries, a fuzzy rules dictionary and a node voltage increment ratio vectors dictionary, both deduced by the node voltage sensitivities, are constructed. The new dictionaries, like the classical ones, can detect and locate single catastrophic faults and, in contrary to the classical ones, they detect and locate parametric faults as well. Moreover, the new approach allows identification of these faults, such that sign of the faulty parameter deviation is designated. The proposed system has some advantages such as the detect-ability of wide faults coverage, minimal storage space plexity, less simulation runs. The experiment re