국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	The Fast Scattering Code (FSC): Validation Studies and Program Guidelines
저자	Tinetti, Ana F.;; Dunn, Mark H.
Keyword	ACOUSTIC SCATTERING;; ELECTRICAL IMPEDANCE;; FLAT PLATES;; NOISE PREDICTION;; POINT SOURCES;; PRESSURE DISTRIBUTION;; SHAPES;; SIMULATION;; SOUND FIELDS;; SOUND PRESSURE;; SPHERES;; SURFACE PROPERTIES
URL	http://hdl.handle.net/2060/20110013015
보고서번호	NASA/CR-2011-217158
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The Fast Scattering Code (FSC) is a frequency domain noise prediction program developed at the NASA Langley Research Center (LaRC) to simulate the acoustic field produced by the interaction of known, time harmonic incident sound with bodies of arbitrary shape and surface impedance immersed in a potential flow. The code uses the equivalent source method (ESM) to solve an exterior 3-D Helmholtz boundary value problem (BVP) by expanding the scattered acoustic pressure field into a series of point sources distributed on a fictitious surface placed inside the actual scatterer. This work provides additional code validation studies and illustrates the range of code parameters that produce accurate results with minimal computational costs. Systematic noise prediction studies are presented in which monopole generated incident sound is scattered by simple geometric shapes - spheres (acoustically hard and soft surfaces), oblate spheroids, flat disk, and flat plates with various edge topologies. Comparisons between FSC simulations and analytical results and experimental data are presented.