The load and displacement loop is plump, and the descent part of framework curve is smooth in the structure.

此类结构滞回曲线的滞回环饱满，骨架曲线下降段比较平缓；

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A planar quadrilateral is adopted as the basic loop in building up the displacement equations, and four basic types of solutions are given.

采用平面四边形为基本封闭形建立位移方程，给出了所有四个基本类型的解。

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Built up the sport mathematics equation of the elbow pole organization based on the loop method, and drew its displacement, velocity and acceleration exercise curve.

基于回路法建立了模切机双肘杆施压机构的运动数学方程，并绘出了双肘杆机构部分构件位移、速度、加速度的运动曲线。

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