The definition of directivity factor, directivity index& equation are introduced firstly. 介绍了指向性因数和指向性指数的定义、计算式。
Theoretical research on the improvement of linear array directivity by using an improving factor 利用改进因子改善直线基阵方向特性
The integrand includes a multiplying factor of the vertical directivity of the noise intensity, and the layered ocean environment affects the spatial coherences via this directivity factor. 积分式中的被积函数包含一噪声强度垂直指向性因子,海洋介质分层条件通过该指向性因子影响噪声场的空间相干。
It is proposed to use the energy concentration factor and directivity factor as indication of the directivity of the array, and formulae as well as the way of using them are presented. 对切比雪夫阵的指向性提出了用能量集中因数和指向性因数表达的概念,并给出了二者的计算方法和使用范围。
Measurement of the directivity factor of a non-rotational symmetry electroacoustic device 非旋转对称电声器件的指向性因子测量