中文摘要：

对于水泵等旋转机械来说，通过采集水泵振动信号并进行分析，能够较全面地判断出水泵设备运行状态；因此，振动信号的采集就成为设备状态监测与故障诊断的关键部分；设计了一套基于小波变换和DSP的水泵故障诊断系统，该系统可以实现对水泵振动信号的实时采集；为了提高振动信号的信噪比，得到较为纯净的振动信号，采用小波消噪的技术对采集的振动信号进行消噪处理；并且以水泵机组正常运行和发生绕组过热、轻度不平衡、严重不平衡、支座松动等故障为例进行诊断实验，并且故障集参数a max,smax，Ta max，Ts max和a min，s min，Ta min，Ts min分别为1．1500，0．1600，46．9787，446．5000和0．9000，0．0700，40．9825，410．6000；实验结果表明，该系统可以有效发现故障，区分故障类型及识别故障程度，为水泵机组故障诊断提供了又一种有效的方法，对其它类似机械故障诊断具有一定的指导意义。

英文摘要：

For water pumps and other rotating machinery, the running status of water pump equipment can be more comprehensive judged through the acquisition and analysis of water pump vibration signal. So the collection of vibration signal is the key part of equipment status monitoring and fault diagnosis. The water pump fault diagnosis system is designed in the paper based on wavelet transform and DSP, and the system can realize acquisition of the water pump vibration signal. In order to improve ratio of the vibration signal to noise, and get relatively pure vibration signal, the vibration signal which is collected is eliminated noise by the wavelet diagnosis technology. We do research on water pump fault diagnosis which exemplified by the water pump unit normal operation, overheating winding, imbalance, serious lopsid- ed, pedestal looseness and so on, and fault set parametersa max, s max, Ta max, Ts max , and a min , s min , Ta min , Ts min are 1. 1500, 0. 1600, 46. 9787, 446. 5000 and 0. 9000, 0. 0700, 40. 9825, 410. 6000 respectively. The experimental results show that the system can effectively find the fault, distinguish fault type and identify degreeof fault, a kind of effective method is provided for water pump unit fault diagnosis, and has the certain instruction significance for other similar mechanical fault diagnosis.