It treats the weighted average sound velocity in different mediums as the average sound velocity in the structure, thus the natural frequency of the structure is calculated.
以声波在各层介质中传播时波速的加权平均值作为构筑物的平均声波波速，计算出结构自振频率。
It is also discovered that the axial velocity distribution and velocity-weighted average swirl Angle at the outlet section of axial-flow pump vary with the changing of wall roughness.
研究还发现，水泵出口断面轴向流速分布均匀度和速度加权平均偏流角也随壁面粗糙度改变而改变。
The paper discussed the average diameter of rain drop, average velocity of moving and falling and the conception of weighted velocity in square root as well as the me - tho...
讨论了雨滴平均直径、平均运动速度、平均降落速度和雨滴加权平方根速度的概念及其计算方法，建立了雨滴平均直径和各种降落速度与雨强、动能的函数关系式。
The paper discussed the average diameter of rain drop, average velocity of moving and falling and the conception of weighted velocity in square root as well as the me - tho...
讨论了雨滴平均直径、平均运动速度、平均降落速度和雨滴加权平方根速度的概念及其计算方法，建立了雨滴平均直径和各种降落速度与雨强、动能的函数关系式。
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