基于角度区间含容差线性模拟电路的故障诊断.pdfVIP

学兔兔 第32卷 第2期 仪 器 仪 表 学 报 VoL 32 No．2 2011年2月 Chinese Journal of Scientific Instrument Feb．2011 基于角度区间含容差线性模拟电路的 故障诊断木 龙 兵，祝 捷，田书林，杨成林 (电子科技大学自动化学院 成都 611731) 摘 要：角度故障模型可以很好地反映线性模拟电路故障的特征，它把无限多的固定参数故障转化为有限几个角度故障模型， 对于线性模拟电路的故障诊断很有价值。但现有的诊断方法采用预定的门限值来处理容差问题，而门限值的确定是一个难题。 证明了角度故障模型是线性模拟电路中故障元件的单调函数，并据此提出了采用角度最大值、最小值构成的故障特征角度区 间来处理电路的容差问题。因为容差问题需要多次调用Pspice仿真，还实现了采用MATLAB自动调用Pspice仿真引擎的程 序，这大大地减少了仿真计算时间。通过电路仿真实验表表明，所提出的方法可以较好地解决含容差模拟电路的故障诊断 问题。 关键词：线性模拟电路；故障诊断；容差；角度区间 中图分类号：TN710 文献标识码：A 国家标准学科分类代码：510．8040 Fault diagnosis method for linear analog circuits with tolerance based on angle range Long Bing，Zhu Jie，Tian Shulin，Yang Chenglin (School ofAutomatic Engineering，University ofElectronic Science and Technology of China，Chengdu 611731，China) Abstract：Angle based fault model has good characteristics in fault description and is valuable in fault diagnosis for linear analog circuits because it can transform unlimited number of fixed value fault models into several angle fault models．A threshold is usually used to deal with tolerance in most diagnosis methods based on angle fauh models： however，how to select the threshold becomes a big problem．The monotonicity between angle fault model and failure components in linear analog circuits is proved in this paper．Based on the monotonicity，an angle range between maximum angle and minimum angle is used to deal with the tolerance．Dealing with tolerance problem needs to call Pspice many times，SO a MATLA