VTOL aircraft is an under-actuated system with three degrees of freedom and two control inputs.
VTOL空间飞行器是具有三个自由度，两个控制输入的欠驱动系统。
A hybrid input planar five-bar mechanism has two degrees of freedom, and its dynamic model is a highly nonlinear and strong coupling system.
混合输入平面五杆机构具有两个自由度，其动力学模型是一个高度非线性和强耦合系统。
The results of computer simulation of a two-rigid-body system with two degrees of freedom of each rigid body show that the method presented in the paper is feasible and effective.
通过一个各有二自由度两刚体系统的计算机仿真识别，结果表明文中所述识别理论和方法是正确和有效的。
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