A novel fault identification dimensionality reduction method based on semi-supervised PCA-LPP manifold learning algorithmwas proposed. The objective function of projection matrix of semi-supervised PCA-LPP was constructed by global structure and local structure,the global structure was described by PCA, the local structure described by LPP and category information of samples,andthe calculation principle of semi-supervised PCA-LPP manifold learning algorithm was given.The processing results of wine dataset of UCI show thatthesemi-supervised PCA-LPP method has a good ability of dimensionality reduction.Aiming at the gearbox acoustic emission signals, its eigenvectorsisconstructed by wavelet packet energy entropy, andthedimensionality reduction results of eigenvectorsare giventothe support vector machine, the fault identification of semi-supervised PCA-LPP method obtainshigher identification rate thanthat ofLPP and PCA, because the method considersthe similarities and differences between all eigenvectors.%提出一种基于半监督思想PCA-LPP的流形学习维数约简故障辨识方法，兼顾PCA的全局结构和LPP的局部结构保持以及样本的类别信息，构造新的投影矩阵目标函数，给出 PCA-LPP 流形学习算法的计算原理。采用UCI中wine数据集验证半监督PCA-LPP方法的维数约简性能，并就齿轮箱故障声发射实验信号，以小波包能量熵作为特征向量，并将特征向量的降维结果输入支持向量机进行故障类型辨识。研究结果表明：半监督PCA-LPP方法的降维结果，能够充分考虑不同故障特征向量的差异信息，相应的故障类型辨识精度高于PCA及LPP方法。
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