Standing Wave Ultrasonic Motor - 2

Comment

In the standing mode of vibrations, points of the surface (blue) move along slanted rectilinear trajectories (red). The longitudinal motion corresponds to the first mode of longitudinal vibrations and the transverse motion arises thanks to the Poisson effect. There can be no motion in the middle (due to complete symmetricity) and at the end: As the normal displacement is zero, no normal pressure and consequently no tangential force arise. Further analysis of the phenomenon see paper 22.