| 基于测前迭代仿真的模拟电路故障诊断方法 |
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| 引用本文： | 胡梅,王红,杨士元.基于测前迭代仿真的模拟电路故障诊断方法[J].计算机辅助设计与图形学学报,2010,22(6). |
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| 作者姓名： | 胡梅 王红 杨士元 |
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| 作者单位： | 清华大学自动化系,北京,100084 |
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| 基金项目： | 国家自然科学基金(60773142);;教育部博士点基金(20070003122) |
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| 摘 要： | 针对非线性模拟电路中元件表现出的折线故障特征,提出一种基于测前迭代仿真的模拟电路统一故障诊断方法.在测前将线性元件参数分段划分区间,在各区间进行仿真得到节点电压平面上的点计算斜率特征,对于斜率变化的区间重新进行参数扫描,并通过迭代仿真得到连续平滑的折线轨迹上的点作为测后诊断依据;在测后诊断中,通过计算实测点到各条折线轨迹的点集合的最小距离来定位电路故障,并根据测前仿真的分段信息对故障元件的参数区间进行识别.文中利用计算机程序实现了测前迭代仿真和测后故障定位及参数区间识别,能够同时诊断容差电路元件的硬故障(开路、短路)和软故障(元件参数变化至容差允许范围之外).最后通过实例的仿真实验和实际电路实验验证了该方法的有效性.
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| 关 键 词： | 模拟电路 故障诊断 折线故障特征 参数扫描 测前迭代仿真 容差 故障定位 参数区间识别 |
A Fault Diagnosis Method for Analog Circuits Based on Iterative Simulation before Test |
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| Hu Mei,Wang Hong,Yang Shiyuan.A Fault Diagnosis Method for Analog Circuits Based on Iterative Simulation before Test[J].Journal of Computer-Aided Design & Computer Graphics,2010,22(6). |
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| Authors: | Hu Mei Wang Hong Yang Shiyuan |
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| Affiliation: | Department of Automation/a>;Tsinghua University/a>;Beijing 100084 |
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| Abstract: | Based on the piecewise linear fault feature of the components in non-linear analog circuits,a unified fault diagnosis method for analog circuits is proposed based on iterative simulation before test.By dividing the parameter of linear component into sections before test,slope features of the simulation result points in the node-voltage plane are calculated after simulation in every section.For the section with slope change,iteration simulation is implemented after another parameter scanning,and then the poi... |
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| Keywords: | analog circuit fault diagnosis piecewise linear fault feature parameter scanning iterative simulation before test tolerance fault location parameter section identification |
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