Wind Noise Estimation Method in Low-Frequency Sound Measurement in Windy Outdoor Environment

It is generally known that low-frequency sound is affected by natural winds when measured on-site. In this paper, the estimation method of wind noise by wind tunnel and outdoor natural wind has been examined step by step. Firstly, wind tunnel experiments were conducted to confirm the relationship between wind velocity time average values and turbulence intensity, and to create the estimation fornula. Secondary, the field experiment was conducted using a low-frequency sound generator as a sound source, and the different results between the wind tunnel experiment and outdoor experiment were discovered. Then, we accumulated the field data in different roughness divisions and tried to create the wind noise estimation fornula at each point. As a result, we considered the different results according to the roughness division and obtained the results that it is possible to estimate the wind noise by using the proposed estimation fornula.