Heat Energy Modelling of Travelling Wave Piezoceramic Ultrasonic MotorMohd Fathuddin Mohd Sunif, Mohd Noor Firdaus Haron and Fadhlur Rahman Mohd RomlayMATEC Web Conf., 225 (2018) 01009DOI: https://doi.org/10.1051/matecconf/201822501009