水泵空化状态下的声发射信号特征试验研究

针对水泵空化现象较难解决的问题,在水泵试验台上进行定转速定流量的空化模拟试验,利用已设计好的监测系统对水泵的声发射信号进行了实时采集和分析处理,并分析了水泵在空化状态下的声发射信号波形频谱特征和声发射信号参数特征,获得了水泵有效汽蚀余量与声发射信号特征参数之间的关系。试验结果表明,声发射信号特征与水泵空化状态之间存在明显的对应关系,可利用此种关系判断水泵空化故障的发生,为运用声发射技术监测水泵空化提供了试验依据。

Experimental Research on Characteristics of Acoustic Emission Signal under Pump Cavitation Conditions

In view of thorny issue for solving pump cavitation, the cavitation experiments are simulated on a pump test-bed under the conditions of constant rotational speed and discharge. The AE signal of the pump is acquired and analyzed with the designed monitoring system. And the characteristics of AE signal waveform spectrum and parameters are obtained under the pump cavitation conditions. Then the relationship between the effective net positive suction head and the AE signal parameters is obtained. The results show that there is a close correlation between AE signal characteristics and pump cavitation conditions and it can be used to determine the occurrence of pump cavitation fault, which provides experimental references for monitoring pump cavitation.