Abstract
The problem of steady-state longitudinal oscillations of a rod-like waveguide was solved. As a result, the distribution of internal heat sources was determined and the spatial and time distribution of temperature over the waveguide surface was calculated. The changes in the resonance frequency spectrum of an ultrasonic oscillatory system (USOS) consisting of a piezoelectric transducer and a rod waveguide were measured experimentally. The variations in the resonance frequency spectrum depend on the rod waveguide temperature. The dependence of the elastic modulus and the absorption coefficient on temperature allows the shift in the USOS resonance spectrum caused by heating of the deformation antinode areas during prolonged operation at resonance frequency to be determined.
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