モータ用冷却ファンからの騒音推定

抄録

This paper describes numerical aeroacoustics simulation of fan noise for the bi-directional rotating electric motor. For solving aeroacoustics, we took into account transient compressible flow and turbulent flow. Moreover for solving turbulent flow, Large Eddy Simulation (LES) was used. The fundamental motor structure was constructed to verify the prediction accuracy of our numerical simulation model. Also, we measured not only the sound pressure level in the free space but also pressure fluctuation on the sound source area where is downstream of the fan in this study. Predicted sound pressure level and fluid pressure fluctuation at different rotational speed are in good agreement with the experimental result.