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Force System Resultants

Couple Moment in Force Systems

Description

A couple is a pair of parallel forces that are equal in magnitude and opposite in direction. The two forces are separated by a perpendicular distance called the couple arm. Together, they create a turning effect on a body instead of a net push.

This turning effect is called the couple moment. It ...

Transcript

力偶是一对大小相等、方向相反且相互平行的力,二者之间具有垂直距离。

力偶会产生一个力矩,使物体绕垂直于力作用平面的轴旋转,该力矩称为力偶矩。

考虑使用套筒扳手拧紧螺栓。当施加两个大小相等、方向相反且不共线的力时,便形成一个力偶。  在扳手的两点上施加大小相等、方向相反的力 AB,以垂直距离分隔。

位置矢量 rA 和 rB 是从坐标系的原点指向力的作用点的矢量。

关于原点的力偶矩是位置矢量与力的叉积之和。

位置矢量 rA 与 rB<...