Abstract

AbstractBy using a finite‐difference time‐domain method combining the dispersion relation preserving scheme in space and a Runge‐Kutta scheme in time, the effect of dissipation on acoustic propagation is studied. It is shown that both trajectory and transmission loss of the wave packet are changed by the inhomogeneity of dissipation. Due to the inhomogeneous dissipation, the upper and lower part of the wave packet is attenuated at different levels, so that the energy center of the packet is shifted to the area where the dissipation is weaker, and the wave trajectory is refracted. As for the transmission loss, compared to the zero absorption case, the geometric spreading loss is reduced, and the atmospheric absorption is smaller than the constant absorption case. The dissipation makes acoustic propagation become dispersive because the attenuation coefficient is proportional to the square of frequency. The deflection of acoustic waves caused by the inhomogeneous dissipation is enhanced with increasing frequency.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.