往复发动机的故障诊断是较困难的 ,然而是热点的研究问题之一。本文主要针对活塞销与衬套磨损故障进行了振动测试研究。在EQ610 0发动机预先模拟活塞销与衬套磨损故障 ,然后测取了在不同的转速、活塞销与衬套间隙、测点时的故障信号 ,并用时域和频域分析法进行了分析。提取了诊断该故障的特征参数并给出了识别的办法。 Reciprocating engine fault diagnosis is more difficult, however, is one of the hot research issues. In this paper, we mainly study the vibration test of piston pin and bush wear failure. The EQ610 engine pre-simulated wear and tear on the piston pin and bushing, and then measured the fault signals at different speeds, clearance between piston pins and bushing, and measured points, and analyzed them by time domain and frequency domain analysis. The characteristic parameters for diagnosing the fault are extracted and the way of identification is given.