Nonlinear acoustic phenomena in a quartzite rod resonator

- The results of experimental and theoretical studies of nonlinear acoustic phenomena in a quartzite rod resonator are presented.
- Analytical description of the observed phenomena is carried out within the frames of the phenomenological state equations containing hysteretic, dissipative and reactive nonlinearity.
- The values of quartzite acoustic nonlinearity parameters are determined.

Here we have presented the results of experimental and theoretical studies of nonlinear acoustic effects (such as low-frequency amplitude-dependent losses, resonant frequency shifts, and high harmonic generation as well as a damping and carrier phase delay of weak ultrasonic pulses under powerful low-frequency pumping wave) in a rod resonator made of a crystalline rock - quartzite. Also, we have given an analytical description of the observed phenomena within the frameworks of the phenomenological equations of state that contain low-frequency hysteretic nonlinearity and both dissipative and reactive high-frequency nonlinearities. Comparison of experimental and analytical amplitude-frequency dependencies of the nonlinear phenomena allowed us to determine quartzite acoustic nonlinearities parameter values.