基于模糊线性规划的模拟电路软故障诊断  

Diagnosis of soft-fault in analog circuit based on fuzzy linear programming

作　　者：周龙甫[1,2] 师奕兵[1] 唐静远[1] 李焱骏[1] 

机构地区：[1]电子科技大学自动化工程学院,成都610054 [2]解放军第452医院,成都610061

出　　处：《仪器仪表学报》2009年第5期899-904,共6页Chinese Journal of Scientific Instrument

基　　金：国家“863”高技术研究发展计划(2006AA06Z222);教育部新世纪人才支持计划(NCET-05-0804)资助项目

摘　　要：研究阐述了一种新的容差条件下基于模糊线性规划理论的模拟电路软故障诊断方法。通过灵敏度分析建立电路测试节点电压增量方程,确立各个元件的模糊隶属函数,从而建立起模拟电路故障诊断的模糊线性规划方程组。通过求解方程组来确定电路中各元件在一定故障情况下的最小变化量。在容差条件下,将方程组的解与各元件容差范围相比较来定位故障元件。从而,兼顾故障元件定位和故障元件参数偏移量确定。实验结果表明,该方法可以有效地实现模拟电路元件参数在一定容差范围内随机变化条件下的软故障诊断。In this paper, a novel soft-fauh diagnosis approach for analog circuit under parameter tolerance based on fuzzy linear programming （FLP） is proposed. The node-voltage increment equations based on the sensitivity analysis and the fuzzy function for each element in circuit are built as the constraints of a FLP equation. Through evaluating parameters deviations from the solution of the FLP equation, it can state whether the actual parameters are within their tolerance ranges or not. Then, both the locating of faulty element and the evaluating of parameter deviation of the faulty element in analog circuit are presented by the proposed approach. The simulation example shows its effectiveness in fault diagnosis with tolerance.

关 键 词：模拟电路 故障诊断 容差 软故障 灵敏度 模糊线性规划 

分 类 号：TN710[电子电信—电路与系统] O221.1[理学—运筹学与控制论]