The attitudes of vehicle are described by both quaternion and Euler angles, and two kinds of motion equations are established accordingly.
通过四元数法和欧拉角法描述飞行器姿态，并建立相应的运动学方程。
Euler equations are applied to calculate the aerodynamic forces, when the time-domain method is used to solve structural motion equations.
用欧拉方程计算非定常气动力，在时域内求解结构运动方程。
Euler equations are applied to calculate the aerodynamic forces, when the time-domain method is used to solve structural motion equations.
用欧拉方程计算非定常气动力，在时域内求解结构运动方程。
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