Funding for this research was provided by:
Science and Technology Project of Sichuan Province (2018RZ0075)
Science and Technology Project of CHINA RAILWAY (2017J001-F, N2018G023)
Article History
Received: 9 January 2019
Revised: 6 June 2019
Accepted: 12 June 2019
First Online: 29 June 2019