Effects of nonlinear parameter of fluid solid coupling on acoustic field in porous media.
The purpose of this Letter to the Editor is to demonstrate the effects of the nonlinear parameter of fluid solid coupling on the acoustic field in porous media. The nonlinear acoustic field excited by a one dimensional finite amplitude shear wave propagating in the uniform and infinite saturated porous media is studied. Researchers use the complete strain energy formula with third order terms of strain in saturated porous media. The formula for calculating the fluid solid coupling nonlinear parameter g from the dynamic compatibility condition is given. To illustrate the effect of the fluid solid coupling nonlinear term on the nonlinear acoustic field excited by the longitudinal and transverse waves, this study compares nonlinear acoustic fields excited by a finite amplitude wave with and without nonlinear parameter g. The results show that the nonlinear parameter g has an influence on the nonlinear acoustic field excited by the one dimensional shear wave, but it has no influence on the nonlinear acoustic field excited by the one dimensional longitudinal wave.
The Journal of the Acoustical Society of America