A Rub-Impact Recognition Method Based on Improved Convolutional Neural Network  

作　　者：Weibo Yang Jing Li Wei Peng Aidong Deng 

机构地区：[1]College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [2]School of Information Engineering,Nanjing Audit University,Nanjing,211815,China [3]National Engineering Research Center of Turbo-generator Vibration,Southeast University,Nanjing,210009,China

出　　处：《Computers, Materials & Continua》2020年第4期283-299,共17页计算机、材料和连续体（英文）

基　　金：The authors would like to acknowledge the Six Talent Peaks Project in Jiangsu Province[XCL-CXTD-007];China Postdoctoral Science Foundation[2018M630559]for their financial support in this project。

摘　　要：Based on the theory of modal acoustic emission(AE),when the convolutional neural network(CNN)is used to identify rotor rub-impact faults,the training data has a small sample size,and the AE sound segment belongs to a single channel signal with less pixel-level information and strong local correlation.Due to the convolutional pooling operations of CNN,coarse-grained and edge information are lost,and the top-level information dimension in CNN network is low,which can easily lead to overfitting.To solve the above problems,we first propose the use of sound spectrograms and their differential features to construct multi-channel image input features suitable for CNN and fully exploit the intrinsic characteristics of the sound spectra.Then,the traditional CNN network structure is improved,and the outputs of all convolutional layers are connected as one layer constitutes a fused feature that contains information at each layer,and is input into the network’s fully connected layer for classification and identification.Experiments indicate that the improved CNN recognition algorithm has significantly improved recognition rate compared with CNN and dynamical neural network(DNN)algorithms.

关 键 词：Acoustic emission signal deep learning convolutional neural network spectral features RUB-IMPACT 

分 类 号：TP1[自动化与计算机技术—控制理论与控制工程]