Performance testing method for wideband perforated plate

A test method and perforated plate technology, which can be applied to sound-producing instruments, use sonic/ultrasonic/infrasonic waves to analyze solids, instruments, etc., and can solve the problems of inability to change a single sound absorption peak, limitation, poor sound absorption effect, etc.
CN107039028AActive Publication Date: 2017-08-11郭辰曦
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
郭辰曦
Publication Date
2017-08-11

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Abstract

The invention discloses a wideband perforated plate which comprises a back plate. The back plate is provided with a plurality of first hollow chambers and a plurality of second hollow chambers. A second hollow chamber is arranged between each two adjacent first hollow chambers. The first hollow chamber comprises a pore plate A, and the second hollow chamber comprises a pore plate B. The pore plate A and the pore plate B are sound absorbing plates with a plurality of pores. The distance between the pore plate A and the back plate is larger than that between the pore plate B and the back plate. The wideband perforated plate can effectively enlarge a sound absorbing band width and realizes high sound absorbing performance. Furthermore the performance testing method according to the invention has advantages of simple operation and high practicability.
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Description

technical field

[0001] The invention relates to a performance testing method of a broadband perforated plate, which belongs to the technical field of noise control. Background technique

[0002] At present, some research institutions have proposed a simplified form of active-passive combination of micro-perforated sound absorbers, that is, the loudspeaker based on the piezoelectric shunt damping circuit is placed in the micro-perforated cavity. This micro-perforated structure is suitable for absorbing medium and high frequency noise, while The broadband noise absorption effect is poor.

[0003] Ordinary micro-perforated sound-absorbing structures have only one resonant absorption peak, and the single sound-absorption peak cannot be changed without adding any acoustic modification. For the traditional large-aperture single-layer micro-perforated sound-absorbing structure, the absorption width is two octaves near the resonance frequency, so the resonant sound-absorbing charac...

Claims

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