Micro-perforated plate sound absorber with axial periodic rough surface annular micropores
A rough surface and micro-perforated plate technology, which is applied in the direction of sound-generating devices, instruments, building components, etc., can solve the problems that affect the application performance of micro-perforated plates, the difficulty of adjusting the sound absorption frequency band, and the difficulty of improving sound absorption performance, etc., to achieve light weight, The effect of widening the bandwidth and improving the sound absorption performance
Pending Publication Date: 2022-05-31
橙易声学科技(苏州)有限公司
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Problems solved by technology
With the acceleration of industrial modernization and the rapid development of the field of building materials, the requirements for a healthy and harmless acoustic environment are getting higher and higher. The sound absorption frequency band of traditional micro-perforated panels is difficult to adjust, and the absorption of middle and low frequency noise is weak. The defect that it is difficult to improve the sound absorption performance is becoming more and more obvious, which greatly affects the application performance of micro-perforated panels in modern engineering practice
Method used
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Embodiment
[0034] Examples of materials:
[0035] Air: characterized by a density of 1.205kg / m 3 , the speed of sound is 343m / s.
[0036] Metal aluminum: characterized by a density of 2700kg / m 3 , Young's modulus is 69GPa, Poisson's ratio is 0.33.
[0037] Embodiment structure size:
[0038] Micro-perforated panel 1 Thickness: t 1 =12mm, cavity thickness: t 2 = 100mm. The hydraulic radius of the inner wall of the annular sound-absorbing hole 3: r 0 =0.5mm, the radius of the outer wall of the annular sound-absorbing through hole 3: r 1 = 0.9 mm. The value range of the amplitude ε of the periodic rough surface is [0,0.2], and the value range of the wave number α of the periodic rough surface is [0,4π]. The perforation rate is 14%, and the cavity between the micro-perforated panel 1 and the rigid backing 2 is not filled with porous sound-absorbing material.
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Abstract
The invention provides a micro-perforated panel sound absorber with axial periodic rough surface annular micropores, which comprises a micro-perforated panel, a rigid backing and a cavity between the micro-perforated panel and the rigid backing, the micro-perforated panel is provided with annular sound absorption through holes, the forming direction of the annular sound absorption through holes is perpendicular to the micro-perforated panel, and the annular sound absorption through holes are communicated with the cavity. The axial periodical rough surface form of the annular sound absorption through holes formed in the micro-perforated panel is controlled by a function. The sound absorption device is simple in structure, light in weight and high in sound absorption coefficient at medium and low frequency bands, the sound absorption frequency bands are flexibly and effectively adjusted through reasonable design of the structure, the sound absorption performance of the corresponding frequency bands is improved, and the sound absorption device has wide engineering application prospects.
Description
technical field [0001] The invention relates to the technical field of vibration and noise control, in particular to a micro-perforated plate sound-absorbing body with annular micro-holes on the axially periodic rough surface. Background technique [0002] Due to its simple structure, light weight, and good sound absorption effect without filling porous sound-absorbing materials, micro-perforated panels have been widely used in construction, transportation, aerospace and other industries. The perforation shape of the traditional micro-perforated plate is a smooth circular cross-section straight hole, the sound absorption frequency is mainly concentrated in the middle and high frequency range, and the sound absorption frequency band is narrow. With the acceleration of industrial modernization and the rapid development of the field of building materials, the requirements for a healthy and harmless acoustic environment are getting higher and higher. The sound absorption frequen...
Claims
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IPC IPC(8): G10K11/162G10K11/172E04B1/84E04B1/86
CPCG10K11/162G10K11/172E04B1/84E04B1/86E04B2001/8461E04B2001/8485
Inventor 沈承杨莎莎
Owner 橙易声学科技(苏州)有限公司
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