文档介绍：电压灵敏度向量在模拟电路故障诊断中的应用*
李焱骏陈世杰王厚军师奕兵
(电子科技大学自动化工程学院, 成都 610054)
摘要: 针对模拟电路故障中元件参数连续变化具有无穷多种可能性的问题, 首先证明了线性模拟电路中, 测试点电压向量在故障状态下相对于标准状态下的增量, 其向量方向由故障元件在被测电路中的位置决定。并证明了节点电压敏感度向量方向与节点电压向量增量的方向相同, 并且其模反映了故障元件参数变化量到节点电压向量的权重。以修正后的节点电压灵敏度向量为故障特征建立故障字典, 提出一种容差条件下的故障诊断判定算法, 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单一软故障诊断。针对ITC’97 Benchmark 电路中的连续时间状态可变滤波器电路, 仿真实验实现了10%容差条件下的故障诊断, 验证了该理论的正确性和方法的有效性。
关键词: 灵敏度向量;故障特征;故障字典;判定算法
中图分类号: TP306+.3 文献标识码: A 国家标准学科分类代码:
Application of voltage sensitivity vector in analog circuit fault diagnosis
Li Yanjun Chen Shijie Wang Houjun Shi Yibing
(School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China)
Abstract: Considering that the element parameter in analog circuit may deviate to infinitude probability, it is proved that the direction of the voltages vector, which is the increment between the measurement voltages vector at faulty state and the one at the nominal state, is determined by the location of the faulty element in the linear analog circuit. It is also proved that the direction of the sensitivity vector is the same to the increment of the node voltage vector, and the module of the sensitivity vector can present the weight from the element parameter variation to the increment of the node voltage vector. Then the fault dictionary is made up of modified element parameter sensitivity