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Heterogeneous/special-shaped acoustic black hole and photonic crystal mixed vibration and noise reduction enhancing structure

A phononic crystal, vibration reduction and noise reduction technology, which is applied in the direction of sound-generating equipment, non-rotational vibration suppression, instruments, etc., can solve the problem of unsatisfactory control effect of medium and low frequency vibration and noise, poor effect of medium and low frequency vibration and noise reduction, and structural bearing capacity To achieve the effect of efficient dissipation, high-efficiency vibration and noise reduction, and weight reduction

Active Publication Date: 2021-08-27
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the frequency at which the existing acoustic black hole structure starts to work is relatively high, and the bending wave control ability in the high frequency band is obvious, but the control effect on the vibration and noise of the middle and low frequencies is not ideal, and the effect of vibration and noise reduction on the middle and low frequencies is poor.
At the same time, after the acoustic black hole is embedded in the plate structure, due to the removal of part of the material, the structural stiffness becomes smaller due to the reduction in the thickness of the acoustic black hole, and the bearing capacity of the structure also decreases

Method used

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  • Heterogeneous/special-shaped acoustic black hole and photonic crystal mixed vibration and noise reduction enhancing structure
  • Heterogeneous/special-shaped acoustic black hole and photonic crystal mixed vibration and noise reduction enhancing structure
  • Heterogeneous/special-shaped acoustic black hole and photonic crystal mixed vibration and noise reduction enhancing structure

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Embodiment Construction

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0041] Combine below Figure 1 to Figure 5 A vibration-reduction and noise-reduction enhancement structure 1000 mixed with a heterogeneous / hetero-shaped acoustic black hole and a phononic crystal according to an embodiment of the present invention will be described.

[0042] like Figure 3 to Figure 5 As shown, a heterogeneous / hetero-shaped acoustic black hole and phononic crystal mixed vibration and noise reduction enhancement structure 1000 according to an embodiment of the present invention includes two laminates 1 and damping materi...

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Abstract

The invention discloses a heterogeneous / special-shaped acoustic black hole and phononic crystal mixed vibration and noise reduction enhancing structure which comprises two laminates. The two laminates are fixed in a mutually attached mode, heterogeneous / special-shaped acoustic black hole arrays are embedded in the two laminates respectively, the heterogeneous / special-shaped acoustic black hole arrays on the two laminates are in mirror symmetry, and the corresponding acoustic black hole structures in the heterogeneous / special-shaped acoustic black hole arrays on the two laminates form a black hole cavity. Each heterogeneous / special-shaped acoustic black hole array comprises a special-shaped acoustic black hole structure, and the special-shaped acoustic black hole structure is obtained by combining the characteristics of a uniform circular two-dimensional acoustic black hole structure and a wedge-shaped two-dimensional acoustic black hole structure. The structure further comprises a damping material piece or a sound absorption material piece which is attached to the interior of the black hole cavity. Full-frequency-band vibration and noise reduction can be achieved, and the cost is reduced while an automobile is lightened.

Description

technical field [0001] The invention relates to the technical field of automobile vibration reduction and noise reduction, in particular to a vibration reduction and noise reduction enhancement structure in which heterogeneous / special-shaped acoustic black holes and phononic crystals are mixed. Background technique [0002] Noise control is divided into active control and passive control. Since active control requires external energy, the system implementation is relatively complicated. Most of the current engineering structures adopt passive control methods. [0003] The vibration and noise of the car directly affect the ride comfort of the occupants, and then affect the quality of the car. At present, passive noise reduction measures taken on automobile bodies mainly include: attaching viscoelastic damping materials (hereinafter referred to as damping materials) on the body panel structure, using absorbing / sound-insulating materials and absorbing / sound-insulating structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168F16F15/02F16F15/08
CPCG10K11/168F16F15/02F16F15/08
Inventor 刘献栋梁浩鸣单颖春鲍岳何田
Owner BEIHANG UNIV
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