1. Department of Mechanical Engineering ScienceUniversity of Johannesburg, Auckland Park Kingsway Campus JOHANNESBURG 2006, REPUBLIC OF SOUTH AFRICA
2. Kent State University, College of Aeronautics and Engineering Kent, Ohio 44240 United States of America
3. Department of Mechanical Engineering, Butterworth CampusWalter Sisulu University BUTTERWORTH 4960, REPUBLIC OF SOUTH AFRICA
4. Department of Material and Metallurgical EngineeringUniversity of Ilorin ILORIN, FEDERAL REPUBLIC OF NIGERIA
5. Department of Mathematics and StatisticsTshwane University of Technology PRETORIA, REPUBLIC OF SOUTH AFRICA.
6. Ishlinsky Institute of Problems in MechanicRussian Academy of Science Leninskiy Prospekt, 14 MOSCOW, RUSSIAN FEDERATION