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3 Hydroacoustics

3 2000

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Suppression of nonlinear effects in acoustic resonators

Červenka M., Bednařik M., Koniček P.

Hydroacoustics

2000

Vol. 3

73--78

This paper deals with description of finite-amplitude standing waves in both closed and semi-closed resonaiors. Numerical solutions of second-order one-dimensional model equation are used. The nonlinear standing waves are generated by a piston or shaker. Numerical results ol multifrequency driving technique for suppressing of higher harmonics are presented.

Finite-amplitude acoustic waves in liquid-filled resonators

Bednařik M., Červenka M., Koniček P.

Hydroacoustics

2000

Vol. 3

79--84

The paper is focussed on the influence of the shape of the resonator upon the phase and amplitudes of harmonic components of the nonlinear standing wave in order to reduce the nonlinear effects. An one-dimensional model equation. was developed to analyze the nonlinear standing waves. If the harmonics are not frequency coincident with the modes of a resonator then we can observe the suppression of the nonlinear effects. The degree of dissonance is influenced by the dispersive effects. Therefore this contribution is dedicated to the study of the dispersive effects on the behavior the nonlinear standing waves.

Finite-amplitude acoustic waves in a liquid-filled tube

Koniček P., Bednařik M., Červenka M.

Hydroacoustics

2000

Vol. 3

85--88

The paper is focussed on description finite-amplitude waves in fluid-filled in tubes. The model equations for study of nonlinear waves are presented here. The used model equations take into account boundary layer effects which cause not only losses but also dispersion of waves.