1. School of Control Engineering, Northeastern University at Qinhuangdao, No. 143 Taishan Road, Haigang District, Qinhuangdao 066004, China e-mail:
2. School of Mechanical Engineering and Electronic Information, China University of Geosciences, No. 388 LuMo Road, Hongshan District, Wuhan 430074, China e-mail: