1. The State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering; Zhejiang University; Hangzhou 310027 China
2. The Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, College of Mechanical Engineering; Zhejiang University; Hangzhou 310027 China
3. The State Testing Laboratory of Hangzhou Bearing Test and Research Centre; Hangzhou 310022 China