動的乱流発生装置により生成した変動空力騒音の変調スペクトル解析

抄録

In order to establish a method for evaluating fluctuating aerodynamic noise, the active turbulence generator was fabricated, and wind tunnel experiments were conducted. A side-view mirror model was set for several flow conditions, and the aerodynamic noises emitted by the model were measured with a microphone. The general spectrum analysis as well as modulation power spectrum analysis were performed on the measured sound. As a result, the general spectrum analysis could not represent the difference in aerodynamic noise at different mainstream turbulence. In contrast, the proposed modulation power spectrum showed that it is possible to represent the spectral intensity and the difference in power of the sound in the modulation frequency band. The future works are to study how to correct the modulation power spectrum by band and how to integrate it in a frequency band, and how to define the sense of fluctuation in auditory tests.