Study on Wind Noise Estimation Method Included in Measurement Data of Low Frequency Sound

摘要

It is well known that outdoor measurement of low frequency sound is affected by wind. The sound pressure data measured through microphone are contaminated by the pressure fluctuation by wind noise. Therefore, it is important to develop a method to estimate the sound pressure level of wind noise that would allow conducting measurements in continuously fluctuating natural wind conditions. In this paper, we have proposed an empirical formula to estimate wind noise in which frequency, average wind speed and turbulence intensity are the key parameters. Based on field measurement at several measurement site with different ground surface roughness, we have determined the values of coefficients required in the proposed formula as functions of the frequency. The appropriateness of the proposed estimation method have verified based on the results of field measurement. The proposed method have applied to the measurement of low frequency sound from existing highway bridges successfully.