Radiation characteristics of noise generated from a wind turbine

Acoustical Science and Technology

Kazuki Higashi¹  Naoto Nishimura³  Yasuaki Okada²  Koichi Yoshihisa² 

[1] Japan Weather Association;Faculty of Science and Technology, Meijo University;Energy Use R&D Center, Kansai Electric Power Co., Ltd.

关键词: Wind turbine noise;    Sound directivity;    Output power;    Rotor rotational speed;    Noise propagation;   

DOI  :  10.1250/ast.36.419

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

References(18)Cited-By(2)In Japan, the development of large-scale wind power generation facilities has been promoted since about 2000. Nationwide investigations of the acoustic characteristics of wind turbine noise have been conducted at various wind farms. In this study, to examine the horizontal and vertical radiation characteristics of noise generated from wind turbines, field measurements of noise from a single wind turbine with a rated power of 1.5 MW have been performed. Some receiving points were set circularly around the wind turbine and mounted on a nearby lightning tower. Meteorological and associated wind turbine operational data were collected at 1 s intervals along with corresponding acoustic data. In addition, the sound pressure level distributions at distances of 50 m to 200 m from the wind turbine were investigated. Results revealed distinguishable horizontal directivity of wind turbine noise. The A-weighted sound pressure levels in the crosswind direction are almost 5 dB lower than those in the up- and downwind directions. Furthermore, it has been found that the sound directivity around the wind turbine could be expressed by a simple empirical formula, assuming the wind turbine to be a point source with combined bi- and omnidirectional patterns.

【 授权许可】

Unknown