1. School of Mechanical EngineeringChung‐ang University 84, Heukseok‐ro Dongjak‐gu Seoul 06974 Republic of Korea
2. Department of Mechanical EngineeringCollege of EngineeringKyung Hee University 1732, Deogyeong‐daero, Giheung Yongin Gyeonggi 17104 Republic of Korea
3. Korea Railroad Research Institute (KRRI) 176, Railroad Museum St Uiwang‐city Gyeonggi‐do 16105 Republic of Korea
4. Korea Institute of Industrial Technology (KITECH) 57, Yangho‐gil Yeongcheon‐si Gyeongsangbuk‐do 38822 Republic of Korea