1. Laboratory of Electromechanical Systems , National School of Engineers of Sfax, University of Sfax , Sfax , Tunisia
2. Higher Institute of Industrial Systems , University of Gabes-Tunisia , Zrig Eddakhlania , Tunisia
3. Tribology Laboratory, Mechanical Engineering Department , National Institute of Technology , Hazratbal Srinagar-190006 , Srinagar , Jammu & Kashmir , India