四边形刚体平板的转动惯量与惯量主轴

The Rotational Inertia for an Arbitrary Quadrilateral Rigid Plane and Its Inertia Principal Axis

任意四边形平板,在平面几何形体中具有一定的代表性,将四边形看成是由两个三角形构成的,则可用较简单的方法求出对质心且方向为任意的转动惯量.一般确定惯量主轴的方法非常繁杂.如果从四边形转动惯量的一般表达式着手,则可用简单的方法给出任意四边形的中心惯量主轴.

Arbitrary quadrilateral rigid plane,have the certain representative in the plane geometry body,see quadrilateral rigid plane be constitute by two triangles,then the rotational inertia,for an arbitrary quadrilateral rigid plane through the center of mass of the rigid that can be free axes,can be obtained with the more simple method. The finding of the inertia principal axis was much more complicated. If we set out from the general expression type of the rotational inertia for an arbitrary quadrilateral rigid plane through the center of mass of the rigid,then can use the simple method to give the principal axis.