1. Xi’an Jiaotong University No.28, Xianning West Road,School of Mechanical Engineering,Xi’an,Shaanxi,P. R. China
2. University of PAP No.1, Wujing Road,School of Equipment Management and Support Engineering,Xi’an,Shaanxi,P. R. China
3. Xi’an Jiaotong University No.28, Xianning West Road,School of Electrical Engineering,Xi’an,Shaanxi,P. R. China