基于压力信号的船用柴油机共轨系统高压油泵典型故障诊断研究

Fault Diagnosis for High-Pressure Pump of Marine Diesel Engine with Common Rail System Based on Pressure Signal

基于AMESim液力仿真平台搭建高压油泵仿真模型,对2种高压油泵典型故障进行仿真分析。采用小波变换方法将压力信号分解为低频波动信号和高频脉动信号,提取高频脉动信号无量纲参数波形因子为故障特征,建立高压油泵故障诊断模型。结合仿真和柴油机台架试验的高压油泵故障数据,验证了该诊断方法的有效性。

A high-pressure pump simulation model was built using the AMESim hydraulic simulation platform, and two typical faults of the high-pressure pump were simulated and analyzed. Based on the wavelet transform, the pressure signals were decomposed into low-frequency fluctuation signals and high-frequency pulsation signals, and the dimensionless parameter waveform factor of high-frequency pulsation signals was extracted as the fault feature, and the diagnosis model of high-pressure pump was established. The effectiveness of the diagnosis method was verified by simulation test and the fault data of high pressure pump by the diesel engine bench test.