基于振动烈度的乳化液泵配流阀弹簧故障特征提取研究

Fault Feature Extraction of Valve Spring of Emulsion Pump Based on Vibration Intensity

针对乳化液泵配流阀弹簧故障识别难度大、故障特征提取困难等一系列问题,提出一种基于振动烈度的乳化液泵配流阀弹簧故障特征提取方法。基于AMESim软件搭建乳化液泵仿真模型,通过分别设置不同参数模拟吸、排液阀弹簧故障形式,得到正常和吸、排液阀弹簧故障状态下的出口压力信号;根据振动烈度理论,将泵出口压力信号转换成加速度信号,在频域上对出口压力信号进行烈度特征值的提取和分析。研究结果表明:当吸、排液阀分别发生故障时,对出口压力烈度特征值的影响规律不同,随着吸液阀弹簧故障程度的加深,出口压力烈度特征值由正常时的15.82 mm/s^(2)增大到20.58、28.18、34.85 mm/s^(2),且在断裂时达到最大值;随着排液阀弹簧故障程度的加深,出口压力烈度特征值由正常时的15.82 mm/s^(2)减小到15.77、14.88、9.28 mm/s^(2),且在断裂时达到最小值。该结果可为后续乳化液泵的故障诊断提供理论依据。

Aiming at a series of problems such as difficulty in fault identification and fault feature extraction of distribution valve spring of emulsion pump,a method for fault feature extraction of distribution valve spring of emulsion pump was proposed based on vibration intensity.The simulation model of the emulsion pump was built based on AMESim software.By setting different parameters respectively to simulate the failure forms of suction and discharge valve spring,the outlet pressure signals under normal and suction and discharge valve spring failure state were obtained.According to the vibration intensity theory,the outlet pressure signals were converted into acceleration signals,and the intensity characteristic factors of the outlet pressure signals were extracted and compared in the frequency domain.The results show that the influence rules on the outlet pressure intensity characteristic value are different when the suction and discharge valves fail respectively.With the deepening of the fault degree of the suction valve spring,the characteristic value of the outlet pressure intensity increases from the normal 15.82 mm/s^(2) to 20.58 mm/s^(2),28.18 mm/s^(2),34.85 mm/s^(2),and it reaches its maximum value at fracture;with the deepening of the fault degree of the discharge valve spring,the characteristic value of outlet pressure intensity decreases from the normal 15.82 mm/s^(2) to 15.77 mm/s 2,14.88 mm/s^(2),9.28 mm/s^(2),and it reaches its minimum value at fracture.The results provide a theoretical basis for the subsequent fault diagnosis of emulsion pump.