1. Department of Mechanical EngineeringEngineering Faculty, University of Malaya, 50603 Kuala Lumpur, Malaysia
2. Advanced Shock and Vibration Research GroupEngineering Faculty, University of Malaya, 50603 Kuala Lumpur, Malaysia
3. Department of Civil EngineeringEngineering Faculty, University of Malaya, 50603 Kuala Lumpur, Malaysia
4. School of DesignEngineering and Computing, Bournemouth University, Poole, Dorset, BH12 5BB, UK
5. Faculty of Mechanical EngineeringUniversity of Malaysia Pahang, 26600 Pekan, Pahang, Malaysia