深度置信網絡在發(fā)動機氣路部件性能衰退故障診斷中的應用研究
[Abstract]:In order to improve the fault diagnosis accuracy of engine rotating component performance decline, the traditional shallow layer network and support vector machine (SVM) method have some problems, such as lack of generalization ability, easy to produce local optimal solution and so on. In recent years, a great breakthrough has been made in the field of pattern recognition, which simulates the deep confidence network (DBN) of the multi-layer structure of the human brain to diagnose the performance degradation of the engine components. In order to improve the performance of deep confidence networks, an improved algorithm (ad_DBN), which adaptively adjusts weights in both unsupervised and supervised training stages, is proposed. Taking turbofan engine as an object, two kinds of DBN algorithms and BP,RBF and SVM methods are compared and analyzed comprehensively from three aspects: diagnostic accuracy, calculation time and anti-noise ability. The results show that the diagnostic accuracy of DBN algorithm is obviously better than that of backpropagation (BP) neural network, radial basis (RBF) neural network and support vector machine (SVM) method, which benefit from the adaptive adjustment of weights. The average accuracy of ad_DBN diagnosis is as high as 97.84%, and its anti-noise ability is obviously superior to other algorithms. It can improve the validity and reliability of fault diagnosis.
【作者單位】: 海軍航空工程學院飛行器工程系;海軍航空工程學院研究生管理大隊;
【基金】:國家自然科學基金(51505492) “泰山學者”建設工程專項經費資助
【分類號】:V263.6
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