基于仿真的电路板级故障诊断测试方法

Circuit Board-level Fault Diagnosis Test Method Based on Simulation

针对某雷达定时器板的电路特点,提出了一种基于仿真的电路板级故障诊断测试方法;首先,利用pspice对被测电路进行功能模型建模和故障模型建模,根据功能模型构建电路仿真原理图进行功能仿真,进而利用故障模型做故障注入进行故障仿真,仿真结束获取功能仿真和故障仿真数据,通过小波分析的方法提取仿真数据的特征,包括能量分布特征提取、极值特征提取和熵特征提取,并做测试节点优化删除冗余数据,最后通过概念格的方法对特征数据做训练,生成应用于被测对象的故障诊断模型;通过获取的故障诊断模型对诊断数据进行故障推理,验证了测试方法的可行性。

For the Circuit characteristics of a radar timer board,this paper presents a circuit board-level fault diagnosis test method based on simulation.Firstly,usied pspice to perform functional model modeling and fault model modeling on the circuit under test,constructed a circuit simulation schematic diagram based on the functional model for functional simulation,and then used the fault model for fault injection to perform fault simulation,After the simulation,obtained the function simulation and fault simulation data,extracted the characteristics of the simulation data by wavelet analysis,including energy distribution feature extraction,extremum feature extraction and entropy feature extraction,and did the test point optimization to delete the redundant data,finally trained the feature data through the concept lattice method to generate a fault diagnosis model applied to the measured object.Used the fault diagnosis model to perform fault reasoning on the diagnostic data,which verified the feasibility of the test method.