Composite board for low-frequency broadband noise reduction of compartment structure

A composite board and low-frequency technology, applied in the field of composite boards, can solve the problems of narrow sound absorption frequency band, passenger noise pollution, passenger comfort, etc., and achieve the effect of small structure size, widened bandwidth and obvious effect

Inactive Publication Date: 2019-12-20
哈工大机电工程(嘉善)研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These resistive sound-absorbing materials can usually achieve good sound-absorbing effects above 900Hz, but for the low-frequency range of 0-500Hz, their sound-absorbing effects are very limited.
Sound-absorbing structures such as micro-perforated plates are resonant sound-absorbing structures, and the sound-absorbing frequency can be tuned by changing the size parameters, but this type of material has a narrow sound-absorbing frequency band in the low-frequency range, and the sound-absorbing effect is not good in t

Method used

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  • Composite board for low-frequency broadband noise reduction of compartment structure
  • Composite board for low-frequency broadband noise reduction of compartment structure
  • Composite board for low-frequency broadband noise reduction of compartment structure

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specific Embodiment approach 1

[0018] Specific implementation mode one: as Figure 1 to Figure 5 As shown, the present invention discloses a composite panel for low-frequency broadband noise reduction facing the box body structure, including a perforated panel 1, a local resonance panel, a back panel 3 and a plurality of support panels 6, and the local resonance panel includes a substrate 2 and a plurality of thin-film vibrators, the substrate 2 is made of light-weight and high-rigidity metal or non-metallic material; the perforated plate 1 is provided with a plurality of sound-transmitting holes 7, and the apertures of the sound-transmitting holes 7 and the distance between them are according to The frequency band design of the required noise reduction, the perforated plate 1, the local resonant plate and the back plate 3 are arranged side by side from the inside to the outside, and the back plate 3 is installed outside the local resonant plate for sound insulation and protection of the local resonant plate...

specific Embodiment approach 2

[0061] Specific implementation mode two: as figure 1 , 2 As shown, this embodiment is a further description of Embodiment 1, and the plurality of sound-transmitting holes 7 are uniformly arranged.

specific Embodiment approach 3

[0062] Embodiment 3: This embodiment is a further description of Embodiment 1. The thin-film vibrator is attached to the surface of the substrate 2 .

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Abstract

The invention discloses a composite board for low-frequency broadband noise reduction of a compartment structure, and belongs to the technical field of acoustic function materials for noise absorbing.A plurality of sound permeable holes are formed in a perforated plate. The perforated Plate, a local resonance plate and a back plate are arranged in parallel from inside to outside. A plurality of supporting plates are crossed transversely and longitudinally and are fixed between the perforated plate and a base plate of the local resonance plate and between the base plate of the local resonanceplate and the back plate. The base plate is divided by the plurality of supporting plates into a plurality of sound absorbing units. Each sound absorbing unit is internally provided with a film vibrator. Each film vibrator comprises a flexible polymer film and a central mass block. The flexible polymer films are fixedly connected with the base plate. The central mass blocks are attached to the centers of the flexible polymer films. The composite board can be conveniently installed in an engineering environment with strict volume requirements, the noise reduction effect is obvious, the bandwidth of the low-frequency sound absorbing section of the compartment structure can be widened, and low-frequency broadband noise reduction is realized.

Description

technical field [0001] The invention relates to a low-frequency broadband noise-reducing composite panel facing a box structure, and belongs to the technical field of acoustic functional materials for noise absorption. Background technique [0002] The emergence of airplanes, high-speed rail, and automobiles has brought great convenience to our lives, but during the ride, the vibration of the car body structure in the above-mentioned vehicles and the noise in the car body structure have greatly weakened the comfort of passengers. . How to achieve effective vibration and noise reduction in the box structure has always been an urgent problem in the field of engineering technology, and the vibration and noise reduction for low-frequency noise is a difficult point among the difficulties. Through consulting literature, it is found that at this stage for various The method of noise reduction in the car body structure in such vehicles mainly includes vibration reduction of wall pa...

Claims

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Application Information

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IPC IPC(8): B61D17/00G10K11/172
CPCB61D17/00G10K11/172
Inventor 陈照波邢旭东朱学治
Owner 哈工大机电工程(嘉善)研究院
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