TY  - EJOU
AU  - Ma, Yunpeng 
AU  - Wang, Lifeng 
AU  - Yi, Mingxu 

TI  - Acoustic Scattering Performance for Sources in Arbitrary Motion
T2  - Computer Modeling in Engineering \& Sciences

PY  - 2017
VL  - 113
IS  - 1
SN  - 1526-1506

AB  - In this paper, an analytical time domain formulation based on Ffowcs Williams-Hawkings (FW-H) equation is derived for the prediction of the acoustic velocity field generated by moving bodies. This provides the imposition of the Neumann boundary condition on a rigid scattering surface. In order to calculate the scattering sound pressure of the duct, a thin-body boundary element method (BEM) has been proposed. The radiate sound pressure is calculated using the acoustic analogy FW-H equation. The scattering effect of the duct wall on the propagation of the sound wave is presented using the thin-body BEM. Computational results for a pulsating sphere, dipole source, and a tail rotor verify the method. The sound pressure directivity and scattering effect are shown to demonstrate the applicability and validity of the approach.
KW  - Scattering performance
KW  -  Ffowcs Williams-Hawkings equation
KW  -  acoustic velocity
KW  -  boundary element method

DO  - 10.3970/cmes.2017.113.086