Based on the coupled dynamic model for the spatialrotation and elastic vibration of a body, the resonance unstability of projectiles in flight is studied in the paper.
从弹箭空间摆动和弹性振动耦合的动力学模型出发，对弹箭飞行过程中的共振不稳定性问题进行了研究。
2
But in "mental rotation," spatial perception, "and" spatial visualization "the advantage goes to men."
但男性在“心理旋转”，“空间感”和“空间形象化”上更具优势。
3
The rotation matrix can be linearly acquired by using only 4 vanishing points and the translation vector can be linearly solved by using only 2 spatial point objects.