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Acoustic black hole sandwich flat plate vibration reduction structure

A vibration-reducing structure and black hole technology, which is applied in the direction of sound-generating devices and instruments, can solve the problems of high price and complex structure, and achieve the effects of low cost, satisfying sound insulation ability, and improving overall rigidity

Active Publication Date: 2021-04-13
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem of complex structure and high price when the existing active control method is used to solve the vibration and noise reduction problem of the aircraft structure

Method used

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  • Acoustic black hole sandwich flat plate vibration reduction structure
  • Acoustic black hole sandwich flat plate vibration reduction structure
  • Acoustic black hole sandwich flat plate vibration reduction structure

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0020] Specific implementation mode one: combine Figure 1 to Figure 5 Describe this embodiment, an acoustic black hole sandwich plate vibration damping structure of this embodiment, which includes a panel 1, a double-sided acoustic black hole embedded panel 2 and a back panel 3, the panel 1 and the back panel 3 are both square plates, and the panel 1 and one side plane of the back plate 3 are provided with an orthogonal stiffened plate 4, and there are multiple cavities 7 in the orthogonal stiffened plate 4, and multiple cavities 7 are embedded in the upper and lower sides of the double-sided acoustic black hole embedded plate 2. an acoustic black hole 5, and a truncated hole 6 is opened at the thinnest position of the thickness of the acoustic black hole 5, the panel 1, the double-sided acoustic black hole embedded board 2 and the back plate 3 are fixedly connected in order from top to bottom, and the double-sided acoustic black hole Each acoustic black hole 5 on the embedde...

specific Embodiment approach 2

[0022] Specific implementation mode two: combination figure 2 with Figure 4 To describe this embodiment, both the panel 1 and the back plate 3 in this embodiment are square flat plates, and the cavity 7 is a square cavity. In such a setting, considering that a single acoustic black hole is formed by rotating a one-dimensional acoustic black hole, it has good symmetry, so the corresponding panels and cavities are designed to be square to ensure the excellent structural strength of the overall structure. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Specific implementation mode three: combination figure 1 Describe this embodiment, the panel 1, the double-sided acoustic black hole embedded panel 2 and the back panel 3 of this embodiment are fixedly connected by gluing or welding in order from top to bottom; or the panel 1, the double-sided acoustic black hole embedded panel 2 and the backplane 3 are integrally formed by 3D printing in order from top to bottom. Such setting can ensure the stability of the overall structure, and ensure that the experimental results can meet the actual needs when the frequency bandgap position is controlled by adjusting the size of the structure and material parameters. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses an acoustic black hole sandwich flat plate vibration reduction structure, and relates to a sandwich flat plate. According to the invention, the problems of complex structure and high price when the vibration and noise reduction problem of an aircraft structure is solved by adopting an active control mode in the prior art are solved. Orthogonal stiffened plates (4) are arranged on planes on one side of a panel (1) and one side of a back plate (3), a plurality of cavities (7) are formed in the orthogonal stiffened plates (4), a plurality of acoustic black holes (5) are embedded in the upper side face and the lower side face of a bilateral acoustic black hole embedding plate (2), cut-off holes (6) are formed in the thinnest positions of the acoustic black holes (5), the panel (1), the bilateral acoustic black hole embedding plate (2) and the back plate (3) are fixedly connected from top to bottom, each acoustic black hole (5) in the bilateral acoustic black hole embedding plate (2) is embedded into one cavity (7), and the acoustic black holes (5) embedded into the cavities (7) are of a single-cell structure. The structure is used for vibration and noise reduction of aircrafts.

Description

technical field [0001] The invention relates to a sandwich plate, in particular to an acoustic black hole sandwich plate vibration damping structure, which is a multi-layer composite sound insulation and vibration damping structure, and belongs to the field of vibration and noise reduction of aerospace and ship structures. Background technique [0002] In the field of power machinery such as aerospace and ships, vibration and noise problems are relatively common. Due to the existence of vibration and noise, it will not only affect the normal operation of various equipment of the aircraft, but also greatly affect the living environment of the staff. Therefore, the vibration and noise problems in aircraft field engineering have always been paid attention to by people. Generally speaking, active control and passive control methods can be used to achieve vibration and noise reduction of aircraft structures. Active control methods can achieve vibration suppression performance in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 刘春川王朋王喆王阳绵傅康
Owner HARBIN ENG UNIV
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