〇(D)sanath De silva^1,2、Uma Maheswari Rajagopalan³、Li Danyang¹、Hirofumi Kadono¹ (1.Graduate School of Science and Engineering, Saitama University, Japan、2.Department of Mechanical and Manufacturing, University of Ruhuna, Sri Lanka、3.Dept. Mech, Eng. Faculty of Engineering. Shibaura Institute of Technology, Japan)