欧拉-伯努利梁的运动学模拟
首发时间:2020-08-06
摘要:以切向加速度模拟轴向力,以法向加速度模拟弯矩,用质点平面运动的轨迹对欧拉-伯努利梁的弯曲变形进行模拟,通过符合性检查和小变形计算证明二者完全等效;在此基础上对平面梁的大挠度变形进行运动学分析,在不进行椭圆积分的情况下获得了部分解析解;并通过运动稳定性验证了压杆稳定的欧拉公式。最后推断只要满足平截面假定,细长梁的空间变形也与质点的空间运动完全等效。
关键词: 理论力学; 欧拉-伯努利梁; 运动学; 平截面假定; 平面运动
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Kinematics Simulation of Euler-Bernoulli Beam
Abstract:In this paper with axial force simulated by tangential acceleration and bending moment simulated by normal acceleration, the bending deformation of the Euler-Bernoulli beam could be represented by the trajectory of plane motion of a partical. The equivalence was proved by compliance check and calculation for small deformation. Based on this the kinematics analysis for large deflections of plane beamswas carried out and partial analytical solution was derived without Elliptic integration. The euler formula for pressure bar stability was verified by the calculation of motion stability. It could be inferred that as long as the plane section assumption is satisfied, the spatial deformation of slender beam is also completely equivalent to the spatial motion of a partical.
Keywords: theoretical mechanics Euler-Bernoulli beam kinematics plane section assumption plane motion
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