The purpose of this study is developing the wind turbine acoustic model considered operating condition by microphone array measurement and operating data acquisition at the same time. This paper reports the result of preliminary measurements and the design concept of microphone array. The Preliminary measurements were operated with sound-level meter at two field wind turbines to characterize wind turbine noise. The measurements show that wind turbine noise in these measurements has broadband characteristic whose peak exists at about 600Hz. In addition, we identified Characteristic sound in wind turbine noise through both measurements by A-weight sound pressure level fluctuation whose period correspond with the number of blade rotation period divided by the three. The fluctuation of one-third octave band spectrum suggested that the frequency of Characteristic sound ranged higher than about 600Hz. Based on the result, we designed the microphone array which is able to analyze at sufficient spatial resolution in higher than 600Hz.
