中文摘要：

电力推进船舶的推进系统由推进电机和螺旋桨组成，其中螺旋桨工作环境恶劣，常因种种故障影响船舶航行安全。针对螺旋桨在水下可能出现的常见故障，提出基于小波分析的信号奇异性检测方法，通过分析推进电机中定子电流信号出现的异常对螺旋桨出现的故障进行故障诊断，仿真实验证明了方法是正确有效的。

英文摘要：

Propulsion system of the electric propulsion ship consists of propulsion motor and propeller. Propeller works under harsh environments and navigation safety will be affected by ship propeller＇s fault. Aimed at common fault of propeller, signal singularity detection based on wavelet analysis is put forward, abnormal signal of propulsion motor stator current is analysed to diagnose propeller＇s fault. The validity of the method is proved by simulation experiment.