Abstract
The computer program CHIEF was designed by Schenck [J. Acoust. Soc. Amer. 44, 41–58 (1968)] to obtain approximate solutions to exterior steady-state acoustic radiation problems for arbitrary shape surfaces whose normal velocity is specified. To test its capabilities as a research tool, CHIEF was used to obtain the acoustic radiation impedance of caps and rings on oblate spheroids. The radiation impedance was also obtained using a harmonic expansion in oblate spheroidal functions. Improved FORTRAN computer programs were developed to evaluate the necessary spheroidal functions accurately. The accuracy of the CHIEF results are discussed in terms of acoustic size, the choice of surface subdivision schemes, and execution time on the CDC 3800 computer at NRL. New input subroutines to CHIEF, which provide numerous geometrical options, are also discussed.
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