Measuring instrument for flow resistance of porous sound absorption material

A porous sound absorption and material flow technology, applied in the direction of measuring devices, instruments, fluid dynamics tests, etc., can solve the problem of lack of reliable support and positioning structure for sample materials, inaccurate measurement results, poor reliability, reliability and economy, etc. problem, to achieve the effect of good reliability and economy, convenient displacement adjustment operation, and convenient operation
CN106918442AInactive Publication Date: 2017-07-04中国测试技术研究院声学研究所
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
中国测试技术研究院声学研究所
Publication Date
2017-07-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a measuring instrument for the flow resistance of a porous sound absorption material, which comprises a specimen tube, wherein one end of the specimen tube is of a closed structure, the other end of the specimen tube is of an open structure, and the tube wall, which is close to the closed end, of the specimen tube is at least provided with a differential pressure measuring joint and an air inlet joint. The measuring instrument is characterized in that a grid plate is supported in the radial direction at the inner wall of the middle part of the specimen tube, the outer surface of the grid plate is used for placing a specimen material, the specimen material is mainly limited in the axial direction by an annular sealing assembly which his arranged in the specimen tube and located at the outer side of the grid plate, the annular sealing assembly is provided with an air flow channel, and the annular sealing assembly is closely matched with the inner wall of the specimen tube. The measuring instrument is conducive to improving and ensuring the accuracy and the reliability of flow resistance measurement of the porous sound absorption material effectively and reliably, and is high in practicability.
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Description

technical field

[0001] The invention relates to sound-absorbing performance testing equipment for sound-absorbing materials, in particular to a flow resistance measuring instrument for porous sound-absorbing materials. Background technique

[0002] Porous sound-absorbing materials are widely used in the sound quality design and noise control engineering of halls. It is required to match the acoustic characteristic impedance of the surrounding sound-transmitting medium, so that sound energy can enter the porous sound-absorbing material without reflection, and make the incident sound energy Most are absorbed. Therefore, it is of great significance and practical value to study and improve the acoustic properties of porous sound-absorbing materials.

[0003] The acoustic properties of porous sound-absorbing materials are determined by many physical quantities, including the physical quantity of flow resistance of porous sound-absorbing materials, which can clearly reflect the m...

Claims

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