考虑剪切效应的旋转FGM楔形梁刚柔耦合动力学建模与仿真

高晨彤; 黎亮; 章定国; 钱震杰

doi:10.6052/0459-1879-18-011

考虑剪切效应的旋转FGM楔形梁刚柔耦合动力学建模与仿真

doi: 10.6052/0459-1879-18-011

高晨彤¹,
黎亮¹,
章定国^1,*, ,,
钱震杰²

1 南京理工大学理学院,南京 210094
2 农业部南京农业机械化研究所,南京 210014

基金项目: 国家自然科学基金(11772158, 11502113, 11602120)和中央高校基本科研业务费专项资金(30917011103)资助项目.

详细信息

作者简介:
通讯作者:章定国,教授,主要研究方向：多体系统动力学. E-mail：zhangdg419@mail.njust.edu.cn

通讯作者:
章定国

中图分类号: O313;
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- 被引次数: 0
出版历程
- 收稿日期: 2018-01-04
- 刊出日期: 2018-05-18

DYNAMIC MODELING AND SIMULATION OF ROTATING FGM TAPERED BEAMS WITH SHEAR EFFECT

1 School of Science, Nanjing University of Science and Technology, Nanjing 210094,China
2 Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture, Nanjing 210014, China

摘要

摘要: 本文对一类中心刚体-柔性梁系统在大范围转动下的刚柔耦合动力学问题进行了研究. 柔性梁为功能梯度材料(functionally graded materials, FGM)楔形变截面梁,材料体积分数在梁轴向呈幂律分布变化. 以弧长坐标来描述柔性FGM梁的几何位移关系,分别使用倾角和拉伸应变变量描述柔性梁的横向弯曲和纵向拉伸变形,并计及剪切效应. 采用假设模态法离散变形场,运用第二类拉格朗日方程进行方程推导,得到系统考虑剪切效应的刚柔耦合动力学模型. 基于全新的刚柔耦合动力学建模理论,研究不同轴向材料梯度分布的FGM楔形梁,通过数值仿真计算,分析讨论不同的转速、梯度分布规律以及变截面参数对系统动力学特性的影响. 结果表明,剪切效应对大高跨比的FGM楔形梁的变形影响较为明显,不容忽略;材料梯度分布规律和截面参数的选取均会对旋转FGM楔形梁的动力学响应和频率产生较大影响. 本文提出的考虑剪切效应的倾角刚柔耦合动力学模型是对以往非剪切模型的进一步完善,可应用于工程中的 Timoshenko梁结构的动力学问题求解.
- 功能梯度材料梁 /
- 倾角 /
- 剪切角 /
- 刚柔耦合 /
- 动力学仿真
Abstract: In this paper, the rigid-flexible coupling dynamics of the rigid-flexible beam system under large overall rotating motion is studied. The flexible beam is a functionally graded material (FGM) tapered beam, and its material properties are assumed to vary along the beam axis with a power law relation. The geometrical displacement relationship of the flexible FGM beam is described by the arc coordinate. The transverse bending and longitudinal stretching of the flexible beam are considered by the variables of the slope angle and the stretching strain, respectively, and the shear effect is taken into account. The assumed modes method is used to describe the deformation field, and Lagrange’s equations of the second kind are used to derive the equations to obtain the rigid-flexible coupling dynamic model considering the shear effect. Based on the new rigid-flexible coupling dynamics modeling theory, dynamics of the FGM tapered beams with different axial gradients are studied. The influences of different rotating speeds, gradient distributions and variable cross-section parameters on the dynamic characteristics of the system are analyzed by numerical simulations. The results show that the effect of shear on the deformation of FGM tapered beam with depth-span ratio is obvious. The distribution of the material gradient and the selection of the cross-section parameters will have a great influence on the dynamic responses and frequencies of the rotating FGM tapered beam. The rigid-flexible coupling dynamic model considering the shear effect is a further improvement of the previous non-shear model, which can be applied to solve the dynamic problems of the Timoshenko beam structures.
- FGM beam /
- slope angle /
- shear angle /
- rigid-flexible coupling /
- dynamic simulation

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