进行非线性系统部件故障诊断的一种方法

Method for diagnosis the fault in parts of nonlinear system

关键词:  非线性系统  级数  系统辨识+  故障诊断

Key words:  Nonlinear system  Series  System identification~+  Fault　diagnosis

摘要:

为了辨识诊断非线性系统的部件故障,提出了Volterra核拟合线辨识模型。将各阶的Volterra核按照一定算法拟合为各阶曲线,基于多个阶跃响应对拟合线进行辨识并进行各阶分离,然后根据故障对各阶拟合线的影响特征进行故障辨识。将它仿真应用于一种液压放大器的故障诊断,结果较准确,计算量较少。适用于对非线性系统的部件偏差及故障的诊断。

Abstract:

To diagnose the fault in parts of nonlinear system, a model named Volterra nucleus fitting line was proposed. Fit each rank Volterra nucleus to a curve in some arithmetic. Discern the fitting line and separate each rank based on the spring response. Then according the effect on fitting line of each error, the error can be identified. It was imitated on a certain hydraulic amplifier used in aeroengine, the result is accurate and the calculation is simple. It is applyed for diagnosis of the fault or error in nonlinear system.