Study on modal characteristics of inflated straight beam

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-05-14 DOI:10.1016/j.tws.2025.113456

Chunlei Jiang , Dongjian Su , Shenshen Cheng , Jinwei Wang , Hao Wang , Shaona Liu , Ruyi Tao

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引用次数: 0

Abstract

The inflated straight beam structure has been extensively used, but it is vulnerable to being vibrated by external disturbance. It is very necessary to carry out a simple and accurate modal analysis. Based on the principle of the virtual work and Timoshenko beam theory, a vibration model of an inflated straight beam is established considering the added mass of the inflated gas and tip effect in this paper. The first-order natural frequency deviation of the inflated straight beam is optimized from an average of 9.73 % to an average of 1.64 % by the finite element method. The second-order natural frequency deviation is optimized from an average of 14.09 % to an average of 2.91 %. Then the accuracy of the model is verified. The existing model is used to analyze the factors affecting the modal characteristics of the inflated straight beam. The results show that the structure of the inflated straight beam, the inflation pressure, and the inflation gas density are the key factors that can affect the mode of the inflated straight beam, and the mode of the beam is unaffected by the membrane thickness when the membrane thickness reaches 70 μm or more. The simulation results can be used for reference in the study of the vibration characteristics of the inflated straight beam.

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膨胀直梁模态特性研究

膨胀直梁结构得到了广泛的应用，但在受到外界干扰时容易产生振动。进行简单而准确的模态分析是十分必要的。基于虚功原理和Timoshenko梁理论，建立了考虑充气气体附加质量和尖端效应的充气直梁振动模型。利用有限元法将膨胀直梁的一阶固有频率偏差从平均9.73%优化到平均1.64%。二阶固有频率偏差由平均14.09%优化到平均2.91%。然后对模型的精度进行了验证。利用已有的模型分析了影响充气直梁模态特性的因素。结果表明：膨胀直梁的结构、膨胀压力和膨胀气体密度是影响膨胀直梁模态的关键因素，当膜厚达到70 μm以上时，膨胀直梁的模态不受膜厚的影响；仿真结果可为研究膨胀直梁的振动特性提供参考。

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

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.