Noise reduction of add-on acoustic black holes with different topologies based on combined Reduced Multibody System Transfer Matrix Method and Elementary Radiators Method

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-04-23 DOI:10.1016/j.tws.2025.113366

Jianghong Liu , Yanni Zhang , Huiliang Jia , Xiaoting Rui , Xiaowei Yan , Guoping Wang , Yang Liu

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引用次数: 0

Abstract

Recently, add-on acoustic black holes (ABHs) have received increasing attentions since they would not reduce the thickness/stiffness of the main structure and are flexible to install. Most of the studies, nevertheless, were conducted from the numerical simulation and experimental perspectives. Efficient theoretical computational methods are still lacking, especially for noise characteristics of a host structure with an add-on ABH as a dynamics vibration absorber (DVA), also known as an ABH-DVA. Herein, a theoretical method is proposed for calculating the noise radiation from a combined system formed by a host structure and an ABH-DVA via combining the Reduced Multibody System Transfer Matrix Method (RMSTMM) and the Elementary Radiators Method (ERM) or RMSTMM-ERM. The RMSTMM-ERM is applied to combined systems with ABH-DVAs of three topologies (unilateral, tree-shaped, spiral), and the results are compared with those from two finite element methods (FEMs). It is revealed that for combined systems with ABH-DVA of all three topologies, the RMSTMM-ERM reduces the computation time by >100 times compared with FEMs, while maintaining a high computational accuracy. Besides, remarkable and broadband low-frequency noise reductions are observed for all three ABH-DVAs, especially the spiral one with a deep-subwavelength dimension (λ/200). The vibration spatial distributions and wavenumber spectra with and without the ABH-DVAs are further investigated to disclose the noise reduction mechanisms. This paper provides an efficient and versatile theoretical computation method and design tool for noise studies of ABHs with complex geometries and topologies.

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基于简化多体系统传递矩阵法和初等辐射体法的不同拓扑附加声黑洞降噪研究

近年来，附加声黑洞（ABHs）因其不会降低主体结构的厚度/刚度，且安装灵活而受到越来越多的关注。然而，大多数研究都是从数值模拟和实验的角度进行的。目前还缺乏有效的理论计算方法，特别是对于附加ABH作为动态减振器（DVA）的主体结构的噪声特性，也称为ABH-DVA。本文将简化多体系统传递矩阵法（RMSTMM）与初等辐射法（ERM）或RMSTMM-ERM相结合，提出了一种计算主结构与ABH-DVA组成的组合系统噪声辐射的理论方法。将RMSTMM-ERM应用于具有单边、树形和螺旋三种拓扑结构的abh - dva组合系统，并与两种有限元方法的结果进行了比较。结果表明，对于三种拓扑结构的ABH-DVA组合系统，与fem相比，RMSTMM-ERM的计算时间减少了100倍，同时保持了较高的计算精度。此外，所有三种abh - dva都有显著的宽带低频噪声降低，特别是具有深亚波长维数（λ/200）的螺旋型abh - dva。进一步研究了有ABH-DVAs和没有ABH-DVAs的振动空间分布和波数谱，揭示了降噪机制。本文为具有复杂几何和拓扑结构的ABHs噪声研究提供了一种高效、通用的理论计算方法和设计工具。

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.