1. School of Mechanical Engineering, the Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, and the Engineering Research Center of Intelligent Unmanned System, Ministry of Education, Shandong University, Jinan, China
2. School of Automation and Electrical Engineering, Linyi University, Linyi, China
3. School of Control Science and Engineering, Shandong University, Jinan, China
4. School of Control Science and Engineering and the Engineering Research Center of Intelligent Unmanned System, Ministry of Education, Shandong University, Jinan, China