Three-order cumulant can eliminate the Gaussian background noise and keep signals features effectively. The 1 ( 1/2) dimensional spectrum originated from it can display the signal of quadratic phase coupling information. The vibration signals of relief valve in normal and anormal situations were collected in the experiment. Three-order diagonal cumulants of collected signals were calculated out, the feature vector was extracted, and then the fault diagnosis was conducted with least squares vector machine. The experiment indicates that the validity is above 80% and the method is feasible.%三阶累量能有效去除高斯噪声,而且其对角累量能有效保持信号特征,由其产生的1(1/2)维谱可以显示信号的二次相位耦合信息.实验中通过计算故障信号和正常信号的三阶对角累量信息,然后利用这些信息进行具体的故障判别.实验结果取得了令人满意的效果.
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