Funding for this research was provided by:
National Natural Science Foundation of China (61603332)
Youth Funds of the State Key Laboratory of Fluid Power and Mechatronic Systems
Science Fund for Creative Research Groups of National Natural Science Foundation of China (51821093)
National Natural Science Foundation of China (51875508)
Article History
Received: 15 January 2019
Accepted: 14 March 2019
First Online: 4 April 2019