1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Health Sciences and Biomedical Engineering Hebei University of Technology Tianjin 300130 China
2. State Key Laboratory for Reliability and Intelligence of Electrical Equipment Hebei Key Laboratory of Smart Sensing and Human‐Robot Interaction School of Mechanical Engineering Hebei University of Technology Tianjin 300401 China
3. State Key Laboratory of Polymer Material Engineering College of Polymer Science and Engineering Sichuan University Chengdu 610065 China
4. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Key Laboratory of Bioelectromagnetics and Neuroengineering of Hebei Province School of Electrical Engineering Hebei University of Technology Tianjin 300130 China
5. Department of Engineering Science and Mechanics The Pennsylvania State University University Park PA 16802 USA