The sound radiation from a rotary-screw compressor was simulated using structural finite-element and acoustic boundary-element analysis. The modes of the housing were measured with and without the screws. Finite-element modal analysis results were compared to the experimental modes with good agreement. Results demonstrated that the internal components affected the bending modes but not the cylinder modes of the compressor housing. The sound radiation from the compressor housing was then predicted using acoustic boundary-element analysis. The results indicated that the second and fourth pumping frequencies were close to structural modes. Subsequent simulations investigated the effect of design changes on the housing via a thicker cylinder and the addition of ribs.
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