1. School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
2. Intelligent Technology Research Institute of Global Research and Development Center, Guangxi LiuGong Machinery Company Limited, Liuzhou 545007, China
3. School of Resources and Environment, University of Electronic Science and Technology, Chengdu 611731, China
4. School of Automation, Guangxi University of Science and Technology, Liuzhou 545006, China
5. Guangxi Collaborative Innovation Centre for Earthmoving Machinery, Guangxi University of Science and Technology, Liuzhou 545006, China