A 2-degree of freedom model of load swing angel was derived based on 3-dimensional dynamic equations of the trolley-load system.
根据小车吊重系统三维动力学方程建立了吊重二自由度摆角的数学模型。
According to the condition of crank existence, all types of 5-bar linkage with 2-degree of freedom are synthesized by linkage mould in extreme position.
根据以机构极端位置建模导出的曲柄存在条件，应用机架变换法导出了两自由度铰链五杆机构（不论连架杆是否为主动件）的全部类型。
The driveline for a tractor vehicle is simplified as a 2-DOFs(degree of freedom)torsional vibration system, and is described as a second-order differential equation.
将牵引车的传动系简化为一个2自由度的扭转振动系统，并以二阶微分方程描述。
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