This paper revisits the popular Rayleigh integral approximation, and also considers a second approximation, the high frequency boundary element method which is similar to the Rayleigh integral. Both methods are approximations to the boundary integral equation, and can solve problems in a fraction of the time required by the conventional boundary element method. The development of both methods from the Helmholtz integral equation is demonstrated and the differences between the two methods are delineated. Both methods were compared on practical examples including a running engine, gearbox, and construction cab. It was concluded that both methods can reliably predict the sound power for many problems but are inaccurate for sound pressure computations.
A New Look at the High Frequency Boundary Element and Rayleigh Integral Approximations
Sae Technical Papers
SAE 2003 Noise & Vibration Conference and Exhibition ; 2003
2003-05-05
Conference paper
English
A new look at the high frequency boundary element and Rayleigh integral approximation
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