The approach described is to solve equation of motion in migrations of elastic
orthotropic and isotropic bodies with regard to boundary problems of steady-state
oscillations. Assumed equations are trnsformed into Helmholtz equations, to obtain
solutions by the method of separation of variables. The comparison is given of the
results of determining longitudinal acoustic speed in a thin plate made of isotropic
material performing planar resonance oscillations, on the basis of experiments and
calculations on wellknown and suggested theories.
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