Sparse Autoencoder-based Multi-head Deep Neural Networks for Machinery Fault Diagnostics with Detection of Novelties  

作　　者：Zhe Yang Dejan Gjorgjevikj Jianyu Long Yanyang Zi Shaohui Zhang Chuan Li 

机构地区：[1]School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,China [2]School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]Faculty of Computer Science and Engineering,Ss.Cyril and Methodius University,Skopje,Macedonia

出　　处：《Chinese Journal of Mechanical Engineering》2021年第3期146-157,共12页中国机械工程学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(Grant Nos.52005103,71801046,51775112,51975121);Guangdong Province Basic and Applied Basic Research Foundation of China(Grant No.2019B1515120095);Intelligent Manufacturing PHM Innovation Team Program(Grant Nos.2018KCXTD029,TDYB2019010);MoST International Cooperation Program(6-14).

摘　　要：Supervised fault diagnosis typically assumes that all the types of machinery failures are known.However,in practice unknown types of defect,i.e.,novelties,may occur,whose detection is a challenging task.In this paper,a novel fault diagnostic method is developed for both diagnostics and detection of novelties.To this end,a sparse autoencoder-based multi-head Deep Neural Network(DNN)is presented to jointly learn a shared encoding representation for both unsupervised reconstruction and supervised classification of the monitoring data.The detection of novelties is based on the reconstruction error.Moreover,the computational burden is reduced by directly training the multi-head DNN with rectified linear unit activation function,instead of performing the pre-training and fine-tuning phases required for classical DNNs.The addressed method is applied to a benchmark bearing case study and to experimental data acquired from a delta 3D printer.The results show that its performance is satisfactory both in detection of novelties and fault diagnosis,outperforming other state-of-the-art methods.This research proposes a novel fault diagnostics method which can not only diagnose the known type of defect,but also detect unknown types of defects.

关 键 词：Deep learning Fault diagnostics Novelty detection Multi-head deep neural network Sparse autoencoder 

分 类 号：TP183[自动化与计算机技术—控制理论与控制工程] TH17[自动化与计算机技术—控制科学与工程]