Abstract: This paper focuses on the acoustic fault diagnosis of the ship centrifugal pump system based on the vibration threshold in view of the insufficient connection between the acoustic fault diagnosis threshold and the historical measured data during the ship construction stage. Firstly, the analysis of the test data of the full-scale ship shows that the maximum vibration fluctuations of the ship centrifugal pump system is more than 10 dB due to the differences in boundary conditions and equipment. Secondly, a normal distribution assumption is made for the vibration deviation value, which is verified by the statistical analysis of the test data. Finally, a threshold extraction method is proposed based on the normal distribution interval estimation principle to check the validity of the above thresholds by simulation experiments. The results show that the diagnostic accuracy of the threshold extracted by this method is 99.45% for normal operating conditions and 92.3% for fault operating conditions. This study can provide a reasonable and operable acoustic fault diagnosis method with high accuracy for the centrifugal pump system during the ship construction stage.

Key words: centrifugal pump, construction stage, acoustic fault, vibration threshold

摘要： 该文针对舰船建造阶段声学故障诊断阈值与历史实测数据缺乏内在联系的问题,以离心泵系统为研究对象,围绕基于振动阈值的舰船离心泵系统声学故障诊断开展研究。首先,通过实船测试数据分析得出船舶离心泵系统由于边界条件差异及设备差异导致振动特性波动最大超过10 dB;其次,对振动偏离值进行正态分布假设,并通过对实测数据的统计分析进行验证;最后,根据正态分布区间估计原理提出阈值提取方法,在此基础上通过模拟试验对以上阈值的有效性进行验证,结果显示,该方法提取的阈值对正常工况的诊断准确率为99.45%,对故障工况诊断准确率为92.3%,该文研究成果可为船舶建造阶段离心泵系统提供一种合理可操作、准确率较高的声学故障诊断方法。

关键词: 离心泵, 建造阶段, 声学故障, 振动阈值