1. Dept. of Mechanical Engineering, Univ. of Mataram, Mataram, West Nusa Tenggara 83125, Indonesia; formerly, School of Mechanical Engineering, Univ. of Birmingham, Birmingham B15 2TT, U.K.
2. School of Mechanical Engineering, Univ. of Birmingham, Birmingham B15 2TT, U.K. (corresponding author).
3. School of Mechanical Engineering, Univ. of Birmingham, Birmingham B15 2TT, U.K.
4. College of Industrial Technology, King Mongkut’s Univ. of Technology North Bangkok, Bangkok 10800, Thailand.