【摘要】 面向轴向移动内压力梁结构动力学特性研究，采用Lagrangian方法建立了轴向移动内压力梁的运动控制方程，基于有限元动网格法对轴向移动梁运动控制方程进行离散。将内压力作为边界条件，采用Newmark-β时间积分方法计算轴向移动梁动力学响应，并开展动力学特性研究。结果表明，建立的有限元动网格模型能够有效地实现轴向移动内压力梁动力学响应计算。轴向移动内压力梁在收缩运动过程中，自由端振动频率将逐渐增加。悬臂长度对梁自由端振动频率具有显著影响。同时，结构振动频率随内压力的增加而增加。本文中建立的有限元动网格模型能够为轴向移动内压力梁动力学研究提供新方法。更多还原

【Abstract】 To study the dynamic characteristics of an axially moving beam subjected to inner pressure, the equations of motion are obtained via Lagrangian method and are discretized using the finite element method with moving mesh. The dynamic responses of the axially moving beam subjected to inner pressure are analyzed by Newmark-β time integration method. The results show that: the established finite element dynamic mesh model could effectively achieve the computation of the dynamic response of axially moving internal pressure beams. During the contraction movement of the axially moving internal pressure beam, the frequency of free end vibration will gradually increase. The cantilever length has a significant effect on the free end vibration frequency of the beam. At the same time, the structural vibration frequency increases with the increase of internal pressure. The finite element dynamic mesh model established in this paper could provide a new method for the dynamic study of axially moving internal pressure beams.更多还原