介绍了在 EQ6 1 0 0发动机上模拟活塞缸套间隙异常时的试验结果。主要测取了在不同的转速、活塞缸套间隙、测点时的故障信号 ,并用时域、频域分析法进行了分析比较。通过分析 ,得出了活塞敲缸故障的诊断特征参数 ,为定性定量地诊断该故障提供了理论依据。试验表明 :采用振动诊断技术能监测发动机活塞缸套的间隙变化和预测故障缸的位置 The test results on the simulated piston cylinder liner gap anomalies on the EQ6 1 0 0 engine are introduced. Mainly measured the different speed, piston cylinder clearance, measuring point fault signal, and time-domain, frequency domain analysis were analyzed and compared. Through the analysis, the diagnosis characteristic parameters of piston knocking fault are obtained, which provides a theoretical basis for the qualitative and quantitative diagnosis of the fault. Experiments show that: the use of vibration diagnosis technology can monitor the engine piston liner gap changes and predict the location of the fault cylinder