It was difficult to extract and diagnose the characteristic of the fault vibration signal of the check valve of the high pressure diaphragm pump. To solve the problem, KPCA combined with LSSVM were performed for fault diagnosis research. The bi-stable SR method and DEMD algorithm were used to preprocess the signal of each state of the one-way valve, and the principal component of the decomposed K-L divergence was used to extract feature parameters of the time-frequency domain to construct the feature vector set. The second feature extraction of vector set was carried out by KPCA, which were further input into the LSSVM diagnostic system to complete check value fault diagnosis and classification. The experimental data proved that the fault diagnosis rate of this method was 90％, and the fault feature of the one-way valve could be diagnosed well.%针对高压隔膜泵单向阀的故障振动信号特征难以提取及诊断的问题, 文中采用KPCA和LSSVM相结合的方法进行故障诊断研究.对单向阀各状态信号运用双稳SR方法和DEMD算法进行信号预处理, 并利用K-L散度选择分解后的主分量进行时频域特征参数的提取以构建特征向量集.运用KPCA对向量集进行二次特征提取, 并将提取的特征向量输入到LSSVM诊断系统中, 以完成单向阀故障诊断及分类.经实验验证, 该方法的故障诊断率可达到90％, 能够较好的诊断出单向阀故障特征.
展开▼
