应用计算流体力学(CFD)方法对转动坐标系下的三维环形密封流场进行了准稳态数值模拟，在此基础上进行了转子动力系数的计算。
Three dimensional annular seal flow field was simulated quasi-steadily with computational fluid dynamics (CFD) method in a rotating reference frame. The Rotordynamic coefficients were calculated.
如何坐标系偏手性与转动方向和顶点订购吗？
How does coordinate system handedness relate to rotation direction and vertices ordering?
通过摄像机-云台系统所采用的视觉坐标系，推导出了摄像机-云台系统转动的角度控制公式，为运动车辆的跟踪提供了理论基础。
The angle control formula of the camera & pan-tilt-device system is educed with its vision coordinates, which provides theory basis for moving vehicle tracking.
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