Study on the Noise Prediction for the Gear Box of the Large Wind Power Yaw Reducer

Abstract

In order to predict the noise of the large wind power yaw reducer, the virtual prototyping model of the large wind power yaw reducer was established based on its working conditions, and the vibration response based on the modal was solved. Noise of the reducer's gear box was predicted by combining the finite element method and acoustic boundary element method, and the results show that the main peak noise frequencies are 420Hz, 590Hz and 1190Hz, the sound pressure which is relatively high is mainly distributed in the low frequency band, and the sound pressure is larger especially when the frequency is between 300Hz and 1200Hz, The corresponding sound pressure level under the noise frequencies of 420Hz, 590Hz and 1190Hz are 82.716dB, 67.333dB and 47.557dB, and the area with large noise is small in the radiation sound field, but the sound pressure is higher than 78.6dB in some area, which have a great influence on environment. The noise prediction results can provide reference and foundation for the study on noise reduction of the large wind power yaw reducer.