1. Hebei Key Laboratory of Robotic Sensing and Human-robot Interactions, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300132, China
2. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
3. Institute of Biophysics, School of Health Science and Biomedical Engineering, Hebei University of Technology, Tianjin 300401, China
4. Department of Electronics and Information Engineering, Hebei University of Technology, Langfang 065000, China