以常见刚体的转动惯量计算为例谈微元的选取

Discussion on the Selection of Infinitesimal Elements through Taking the Calculation of Rotational Inertia of Common Rigid Body for Example

恰当选取微元,是应用微元法计算刚体转动惯量的关键。本文通过分析常见刚体的转动惯量计算中微元选取的例子,阐明三类微元的选取,深入挖掘其内在的教育价值。

The proper selection of infinitesimal elements is the key to calculate the rotational inertia of rigid body with infinitesimal method.Through analyzing the examples of selecting infinitesimal elements in the calculation of rotational inertia of common rigid body,this paper discussed the selection of three kinds of infinitesimal elements to excavate deeply its intrinsic educational value.