ABSTRACT
The transformer modeled in this tutorial is a so-called Rosen-type transformer, and it is somewhat simplified. It operates in a λ/2 longitudinal vibration mode. There are many ways to define the geometrical elements (points, lines, surfaces, and volumes) required for the problem. With the boundary conditions that the people have defined, the resonance mode will correspond to a low-signal excitation at the input side of the transformer and open-circuit conditions at the output side. With the mesh the people have defined, the people cannot expect to accurately compute modes that display more than half a wavelength in the thickness direction, or more than one wavelength in the width direction, or more than three wavelengths in the length direction. Here, the people will use only one interval centered on the resonance frequency that was previously computed at about 71 kHz.
