The free vortex aerodynamics window is used to be the window of high power laser beam, which takes advantage of the centripetal force of the free vortex motion of fluid.
自由旋涡气动窗口是利用流体微团作自由旋涡运动的离心力来平衡大气与光腔压力差，来作为高能激光束的输出窗口。
According to principle of bridge vibration, this paper lead through boundary condition of free beam and deduce vibrational equation of free beam to solve rigidity and model of vibration.
本文根据桥梁的振动原理，引入简支桥梁的边界条件，推导简支桥梁的振动方程，求解出桥梁刚度、振型的实际运用公式。
The dynamic response of a free free beam with uniform rectangular cross section subjected to impact by a mass at both free end is analyzed theoretically.
对矩形截面自由梁在两端同时受到完全相同的集中质量横向撞击问题进行了理论上的研究 ，通过采用刚塑性的材料模型得到了其动力响应完全解。
The dynamic response of a free free beam with uniform rectangular cross section subjected to impact by a mass at both free end is analyzed theoretically.
对矩形截面自由梁在两端同时受到完全相同的集中质量横向撞击问题进行了理论上的研究 ，通过采用刚塑性的材料模型得到了其动力响应完全解。
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