基于单缸柴油机表面异常声发射信号的活塞组件摩擦磨损故障诊断与研究

为了诊断并分析某型单缸柴油机的异常声发射信号,在柴油机缸体上安置振动传感器和声发射传感器。利用小波多分辨率算法对比分析了两个传感器的信号。首先通过几何估算提出了异常信号可能对应的两种故障形式,随后根据拆机检查,确认声发射信号中的故障特征来源于活塞组件之间的异常摩擦事件。诊断结果表明:该型号单缸柴油机的活塞组件的结构尺寸设计不合理,在柴油机正常工作中,连杆小头和活塞内部发生了摩擦事件,导致了声发射信号在固定的曲轴转角上出现异常峰值响应。声发射技术为以后有效监测活塞组件摩擦磨损提供了更准确的诊断方法。

Fault diagnosis and research of friction and wear of piston assembly based on the single cylinder diesel engine abnormal surface acoustic emission signal

In order to In order to diagnosis and analysis of abnormal acoustic emission signal of a single cylinder diesel engine, the vibration sensor and the acoustic emission sensor are mounted in the diesel engine cylinder block,using wavelet multiresolution algorithm comparison analysis of the two sensor signals. Firstly through the geometry estimate abnormal signals may correspond to the two faults is proposed. Then according to the teardown inspection, confirm the acoustic emission signal of fault feature from piston assembly between the abnormal friction events. Diagnostic results shown that: due to the unreasonable design of the structure and size of the types of single cylinder diesel engine piston assembly, in the normal work of the diesel engine, small head of the connecting rod and piston internal occurred friction events, and led to the acoustic emission signal in fixed crankshaft angle appear abnormal peak response. Acoustic emission technique provides a more accurate diagnosis method for the effective monitoring of the friction and wear of the piston assembly in the future.