1. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, China
2. School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, China
3. Center for Structural Acoustics and Machine Fault Diagnosis, Qingdao University of Technology, Qingdao, China
4. Qingdao International Academician Park Research Institute, Qingdao, China