基于Matlab的旋转点声源声辐射的影响因素分析

Analysis on Influence Factors of Rotating Point Source's Acoustic Radiation Based on Matlab

对不同马赫数Ma,声源运动或固定,声强正弦变化频率ωs与声源圆周运动角频率ω的比值条件下的旋转点声源声辐射进行数值计算,探究影响规律.结果表明,随着Ma的增加,声压值pn在时域上出现更平坦的波谷和更尖锐的波峰;声源运动与固定相比,pn出现更平坦的波峰和更尖锐的波谷;随着ωs和ω的比值的增加,波峰数目变多,波谷数目有变多的趋势;与点声源运动轨迹面垂直且通过轨迹圆心的线上的点观测到的声压值不受Ma的影响,其峰值和变化形式不受ωs与ω的比值的影响.

Numerical calculation is applied for rotating acoustic radiation under different Mach number （Ma）, fixed and moving sound source, and the ratio of sound intensity sinusoidal variation＇s frequen- cy （ωs） and the frequency of the sound in circular motion （ω） of point source to explore the influencing regulations. The results show that with the growing Ma, the change of sound pressure （ρn） grows to be violent, and there is flatter wave trough and sharper peak. Compared with the fixed source, there is smaller flatter wave peak and deeper sharper trough for ρn under the moving sound source. When the ratio of ωs/ω increases, there is a trend for more wave peaks and troughs. There is no influence of on the pressure of the point on line which is vertical to the point source＇ s moving trajectory and through the track＇s center, and the peak and sine variation is not affected by the ratio of ωs/ω.