实际中,一些机器零件常常是或者接近是一个旋轉体,但其母线的方程又难以知道,因此用积分是无法計算或算起来也是非常复杂的。下面介紹一种近似計算的公式,希讀者指正。首先我們把所計算的旋轉体当作一个圓錐台来看,然后再考虑凸出来或凹进去的情况,即图1中阴影部分的旋轉体积。 In practice, some machine parts are often or close to a rotating body, but the equations of their bus bars are difficult to know, so using integrals to calculate or calculate them is also very complicated. The following is a formula for approximate calculation. First of all, we consider the calculated rotating body as a frustum, and then consider the convex or concave state, that is, the rotating volume of the shaded part in Figure 1.