Effects of non-axisymmetric internal structures on vibro-acoustic characteristics of a submerged cylindrical shell using wavenumber analysis

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2022-02-01 DOI:10.1016/j.tws.2021.108758

Wenchao Jia , Meixia Chen , Zhiwei Zhou , Kun Xie

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引用次数: 4

Abstract

Non-axisymmetric structures (foundations, equipment etc.) have been extensively arranged in axisymmetric shells and proved to change the mechanism of vibration and sound radiation of the shell. To study the effect of non-axisymmetric internal structures, a hybrid analytic-numerical method is developed for vibro-acoustic characteristics analyses of a submerged cylindrical shell. The wave based method (WBM) and finite element method (FEM) are respectively employed to model the shell and internal structures. A precise coupling is carried out to assemble the shell and internal structures, which fully considers all six degree of freedoms (DOFs) at junctions between the two substructures. The acoustic pressure is described by the Helmholtz integral equation. According to the axisymmetric property of the shell, the surface integral is reduced into the curve integral. Subsequently, the final vibro-acoustic model is obtained by introducing the acoustic pressure into the dynamic equation of the coupled structure. The high accuracy of the present method is firstly demonstrated by FEM and boundary element method (BEM). Then by comparing vibro-acoustic responses of the shell with and without internal structures in wave domain, the effects of non-axisymmetric internal structures on vibro-acoustic characteristics of the shell are discussed.

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用波数分析非轴对称内部结构对水下圆柱壳振动声特性的影响

非轴对称结构(基础、设备等)被广泛布置在轴对称壳体中，并被证明改变了壳体的振动和声辐射机理。为了研究非轴对称内部结构的影响，提出了一种用于水下圆柱壳振动声特性分析的混合解析-数值方法。分别采用波基法(WBM)和有限元法(FEM)对壳体和内部结构进行建模。壳体和内部结构进行了精确耦合，充分考虑了两个子结构连接处的所有六个自由度(dof)。声压用亥姆霍兹积分方程来描述。根据壳体的轴对称特性，将曲面积分化为曲线积分。随后，将声压引入耦合结构的动力学方程，得到最终的振声模型。有限元法和边界元法首次证明了该方法的高精度。然后通过比较有无内部结构的壳在波域中的振动声响应，讨论了非轴对称内部结构对壳振动声特性的影响。

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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.