1. College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
2. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
3. School of Mechanical and Electrical Engineering, Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, China
4. Shandong Provincial Key Laboratory of Horticultural Machineries and Equipment, Taian 271018, China
5. College of Engineering, China Agricultural University, Beijing 100083, China