elastic contact
5.AN IMPROVED CALCULATING METHOD FOR BEM? SOLVING 2D ELASTIC CONTACT PROBLEMS
10.The model from the input to the output of the piezoelectric traveling wave ultrasonic motor is established by synthetically using Lagrange-Maxwell equation, Hertz elastic contact theory and Coulomb friction theory, along with considering electromechanical coupling, influence of the interface force between the stator and rotor of the motor on the amplitude of the traveling wave inside the stator and dynamic contact friction friction force.

