go to jove.com

HIGH SCHOOL

Engineering

Concept Videos

Mechanical Engineering

This is a free preview. For full access

Virtual Work

Equilibrium Stability Through Potential Energy

Description

Stability of equilibrium in physics and engineering can be studied by using a system’s potential energy. An equilibrium configuration is a state where the system can remain at rest. Stability describes whether the system tends to return to that state after a small disturbance.

Problem solving beg...

Transcript

考虑一个连接到弹簧滑轮系统的圆盘,其轮辋上连接着一个球。

旋转圆盘,并绘制仅作用力的自由体图。旋转的偏转显示相对于坐标轴。

为了确定系统的平衡位置及其稳定性,得到了弹性势能函数和重力势能函数的总和。

确定弹簧和球的垂直偏转并将其代入势能函数。

在平衡时,势能函数的一阶导数为零。求解并代入数值可以得到旋转角度的平衡位置。

平衡角的稳定性由势能的二阶导数确定。

如果二阶导数为负,则平衡不稳定。在此角度下,轻微的移动会使系统旋转。

如果为正,则平衡是稳定的,这意味着在旋转时,系统以这个角度静止。

Tags

More videos by Standards