In chapter 2 , a simplified analytical model is presented for the analysis of the bvi mechanism , adopting the beddoes " prescribed wake model . by this model , the azimuthal location and miss - distance of the bvi and the radiation directivity of the bvi noise are calculated and discussed , and some conclusions are obtained 在第二章，使用beddoes预定尾迹模型，建立了一个用于旋翼桨-涡干扰特性机理分析的简化数学模型，分别对旋翼桨-涡干扰位置、桨-涡干扰距离和声辐射方向性等进行了计算和分析，得出了有意义的结果。
