Dynamic behavior of beam with an elastic foundation under the extended moving load for electromagnetic launch rail-structure

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration Pub Date : 2024-09-30 DOI:10.1016/j.jsv.2024.118756

Bao Zhang , Yong Kou , Ke Jin

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引用次数: 0

Abstract

The distributed load with loaded area being extended over the whole structure (i.e., the extended moving load) that occurs during the operation of an electromagnetic launch rail-structure, is different from loading cases studied previously such as the concentrated load or distributed load on a finite segment (i.e., the single moving load), or a series of single moving loads in a periodic pattern (i.e., the periodic moving load). In this paper, a nonlinear finite element model is proposed by modeling the rail-structure as a Euler-Bernoulli based beam on an elastic foundation to study the dynamics of rail-beam under such an extended moving load. The proposed model is firstly verified by comparison with the analytical solution for the rail-vibration response under the extended moving load at constant speed, and the model feasibility is further revealed by comparison with the experimental results of rail strain. The significant differences of rail vibration modes are observed between the extended moving load and the single, or periodic moving load. Moreover, the maximum error of the middle of the rail between the linear forcing and nonlinear forcing will decrease with the increase in the foundation elastic modulus, but increases with the increase in the pulse current. Those results will improve our understanding on dynamics of beam under the more comprehensive loading cases.

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带弹性地基的梁在电磁发射轨道结构的扩展移动载荷下的动态特性

电磁发射轨道结构在运行过程中会产生分布式载荷，载荷区域扩展至整个结构（即扩展移动载荷），这种载荷不同于以往研究的载荷情况，如有限区段上的集中载荷或分布式载荷（即单一移动载荷），或一系列周期性的单一移动载荷（即周期移动载荷）。本文提出了一种非线性有限元模型，将轨道结构建模为弹性基础上的欧拉-伯努利梁，以研究轨道梁在这种扩展移动载荷下的动力学特性。提出的模型首先通过与匀速延伸移动载荷下钢轨振动响应的解析解进行比较进行验证，并通过与钢轨应变的实验结果进行比较进一步揭示了模型的可行性。扩展移动载荷与单一或周期移动载荷下的钢轨振动模式存在明显差异。此外，随着地基弹性模量的增加，线性加载和非线性加载时钢轨中部的最大误差会减小，但随着脉冲电流的增加，误差会增大。这些结果将有助于我们更好地理解在更全面的加载情况下梁的动力学特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Sound and Vibration 工程技术-工程：机械

CiteScore

9.10

自引率

10.60%

发文量

551

审稿时长

69 days

期刊介绍： The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application. JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.