多孔吸声材料声学模型及其特征参数测试方法研究进展

doi:10.11896/cldb.20110035

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Abstract Noise is an important environmental factor of manned spacecraft. The increase of spacecraft environmental noise can directly affect astronauts' work and rest, and then affect space science missions. However, there were many problems of excessive noise in the past manned spacecraft. Porous sound-absorbing materials have been applied in the international space station and achieved good noise reduction effect. The Chinese space station is expected to be built in 2022. Understanding the acoustic model and absorption mechanism of acoustic porous materials is of great significance to the application of noise reduction methods in the operation stage of our space station.
The acoustic equivalent model of porous sound-absorbing materials can be divided into empirical models and phenomenological models. The Delany-Bazley model is a commonly used empirical model, which can not provide accurate prediction. The phenomenological model considers the propagation of sound waves in the pores and cavities of materials. The Johnson-Champoux-Allard phenomenological model has been applied by many scholars. Acoustic characteristic parameters including airflow resistivity, porosity, tortuosity, viscous characteristic length and thermal characteristic length of a porous material are the key to establishing JCA model accurately. Airflow resistivity test methods include direct flow me-thod, acoustic impedance tube method, alternating current (AC) method and comparison methods. Porosity test methods are divided into direct test method and acoustic impedance tube test methods. Tortuosity, viscous characteristic length and thermal characteristic length can be directly measured by ultrasonic, and direct measurement is usually more complex, less reliable and destructive. The inversion optimization method is a common method to obtain tortuosity, viscous characteristic length and thermal characteristic length of a porous material.
This paper summarizes the application of porous materials in the international space station and the research progress of the acoustic equivalent model of porous materials, and introduces the sound absorption principle of porous materials, the basic equation of acoustic disturbance and the test methods of acoustic attribute parameters. It focuses on the empirical model and phenomenological model in the acoustic equivalent model of porous materials, and then analyzes the acoustic properties of porous materials in the acoustic equivalent model. The test methods of characteristic parameters are discussed in detail.

Key words： manned spaceflight noise porous materials equivalent model characteristic parameters impedance tube

Published: 25 February 2022 Online: 2022-02-28

CLC number:

TB535+.1

Fund:Natural Science Foundation of Liaoning Province (2020-MS-029).

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	Articles by authors
	YU Changshuai
	LUO Zhong
	LUO Haitao
	HE Fengxia

Cite this article:

YU Changshuai,LUO Zhong,LUO Haitao, et al. Research Progress on Acoustic Model of Porous Sound Absorbing Materials and Measurement Method of Its Characteristic Parameters[J]. Materials Reports, 2022, 36(4): 20110035-11.

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http://www.mater-rep.com/EN/10.11896/cldb.20110035 OR http://www.mater-rep.com/EN/Y2022/V36/I4/20110035

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