Modeling the structural elements of broadband low-frequency sound absorbers for the transport vehicles

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Abstract

This paper presents an approach to a qualitative change, by 12 to 17 dB and more, of the low-frequency sound absorption inside and outside the transport vehicles. In the approach, the problems are solved of designing the composites of polymer matrixes with inorganic and biopolymer polydisperse phases, and of modeling, measuring and analyzing the sound-absorbing properties of thin mono-/bilayer structural elements based on the new composites. Validity of the approach is confirmed by correctness of the physical, chemical and measurement methods used, and by the results of experimental studying the test-models of the composites. These research results can be used in the current developing and prospective designing the aircraft for various purposes, and other types of transport vehicles.

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About the authors

E. V. Karpov

Lavrentyev Institute of Hydrodynamics of Siberian Branch of Russian Academy of Sciences; Moscow Polytechnic University

Author for correspondence.
Email: evkarpov@mail.ru

Corresponding Member of the RAS

Russian Federation, Novosibirsk; Moscow

V. N. Goverdovskiy

Moscow Polytechnic University

Email: vng_scien@yahoo.com
Russian Federation, Moscow

Yu. I. Brovkina

Moscow Polytechnic University

Email: yulbrovkina@yandex.ru
Russian Federation, Moscow

M. A. Mikhailenko

Moscow Polytechnic University; Institute of Solid Chemistry and Mechanochemistry of Siberian Branch of Russian Academy of Sciences

Email: mikhailenkoma79@gmail.com
Russian Federation, Moscow; Novosibirsk

F. K. Gorbunov

Institute of Solid Chemistry and Mechanochemistry of Siberian Branch of Russian Academy of Sciences

Email: f.gorbunov@corp.nstu.ru
Russian Federation, Novosibirsk

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Supplementary files

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2. Fig. 1. Micrography (dark field method) of the structure of test samples of composite elements made of foamed materials, with matrices of different morphology (dark tone) and different fillers (light tone): (a) – CaCO3, (b) – Cu2CO3(OH)2.

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3. Fig. 2. Test samples of composite elements: a – with a combined inorganic (SiO2) and organic (rice chaff) filler, b – with an increased content of organic filler.

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4. Fig. 3. System for analyzing the effectiveness of test samples of noise absorbers for various combinations of composite elements. Block diagram of ASR measurement and analysis.

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5. Fig. 4. Noise absorption efficiency of elastic elements: single-layer commercial (PEM, VEM), single-layer composite (PKM, VKM, G17) and two-layer (G17-PEM1, G17-VEM2).

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