Abstract

The article describes an experimental facility for studying and testing sound-absorbing linings made of acoustic metamaterials designed to reduce the noise generated by a source in a finite waveguide. The main focus is on the features of acoustic field formation in a waveguide and its emission from the open ends. The article centers on the results of a study of how different facility parameters influence the efficiency of linings. The large influence of the parameter “type of source” on the lining efficiency has been revealed and investigated for the first time. It is rigorously defined, and the physical mechanism of its influence on the efficiency is described. Conditions are formulated under which the efficiency of a sound-absorbing lining measured on the experimental facility will be equal to or close to its efficiency measured on a real object. It is shown that one of the most important conditions is the coincidence of types of acoustic sources used in the facility with a real one. The results obtained are useful in designing efficient sound-absorbing linings, as well as in creating experimental facilities for their development and testing.

中文翻译：

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研究具有放牧声传播的超材料吸声管道衬里的实验室实验设施，以及声源类型如何影响其效率

摘要

本文介绍了一种用于研究和测试由声学超材料制成的吸声衬里的实验设备，该吸声衬里旨在减少有限波导中的源所产生的噪声。主要关注的是波导中声场形成的特征及其从开口端发出的辐射。本文的重点是对不同设施参数如何影响衬砌效率的研究结果。首次揭示并研究了参数“源类型”对衬砌效率的巨大影响。对其进行了严格定义，并描述了其影响效率的物理机制。规定了在实验设备上测得的吸声衬板的效率等于或接近其在实际物体上测得的效率的条件。结果表明，最重要的条件之一是设施中使用的声源类型与真实声源的同时性。获得的结果可用于设计高效的吸音衬里，以及为它们的开发和测试创建实验设备。