Sound insulation structure with Helmholtz cavity

Abstract

The invention provides a sound insulation and insulation structure with a Helmholtz cavity, which consists of three parts, namely a ship body steel plate, sound insulation cotton with a Helmholtz cavity and flatly paved and adhered on the steel plate, and a surface layer adhered on the sound insulation cotton, and the Helmholtz cavity is formed in the sound insulation cotton. Therefore, on the premise that the thickness of the sound insulation cotton is not increased or the sound insulation cotton with higher density is adopted, the use amount of the sound insulation cotton is reduced, and the sound insulation effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of noise reduction technology, specifically relating to a sound insulation structure with a Helmholtz cavity. Background Technology

[0002] In the ship's engine room, superstructure, and other areas, sound insulation is usually installed on the bulkheads and deck roofs in areas frequently used by crew members to reduce noise transmission and minimize the impact on their normal life and work.

[0003] Traditional sound insulation systems typically consist of three parts: ship hull steel plates, sound-absorbing cotton laid flat and bonded to the steel plates, and a surface layer bonded to the sound-absorbing cotton. To achieve better sound insulation, improvements are usually made by increasing the thickness of the sound-absorbing cotton or using higher-density sound-absorbing cotton, resulting in a limited range of optimization methods. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a sound insulation structure with a Helmholtz cavity, which consists of three parts: a ship hull steel plate, sound insulation cotton with a Helmholtz cavity laid flat and bonded to the steel plate, and a surface layer bonded to the sound insulation cotton.

[0005] Furthermore, the Helmholtz cavities are arranged on the sound insulation cotton according to a certain pattern.

[0006] Furthermore, the sound insulation cotton is bonded to the ship's steel plates using adhesive.

[0007] Furthermore, the surface layer is bonded to the sound insulation cotton with an adhesive.

[0008] Furthermore, circular holes are left at the positions corresponding to the Helmholtz cavities on the surface layer.

[0009] Furthermore, the diameter of the circular hole corresponds to the diameter of the Helmholtz cavity.

[0010] Furthermore, the surface layer is a thin sheet of galvanized iron.

[0011] Furthermore, the surface layer is a thin glass fiber cloth.

[0012] Furthermore, the surface layer is aluminum foil cloth.

[0013] Furthermore, the neck diameter and depth of the Helmholtz cavity, as well as the diameter and depth of the cavity body, vary according to the main frequency of the noise to be isolated.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention can improve sound insulation performance while reducing the amount of sound insulation cotton used, without increasing the thickness of the sound insulation cotton or using higher density sound insulation cotton. Attached Figure Description

[0015] Figure 1 This is an overall view of the sound insulation arrangement with a Helmholtz cavity of the present invention; Figure 2 This is a layered view of the sound insulation arrangement with a Helmholtz cavity according to the present invention; Figure 3 This is a cross-sectional view of the sound insulation arrangement with a Helmholtz cavity according to the present invention. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Reference Figure 1 The sound insulation structure with Helmholtz cavities proposed in this application mainly consists of three parts: a ship hull steel plate, sound insulation cotton with Helmholtz cavities laid flat and bonded to the steel plate, and a surface layer bonded to the sound insulation cotton. The Helmholtz cavities are arranged on the sound insulation cotton in a certain pattern. The sound insulation cotton is bonded to the ship hull steel plate with adhesive. The surface layer is bonded to the sound insulation cotton with adhesive. Circular holes with diameters corresponding to the Helmholtz cavity openings are left on the surface layer at the positions corresponding to the Helmholtz cavities.

[0018] Specifically, in some specific embodiments: like Figure 2 and Figure 3 As shown, the sound insulation arrangement with Helmholtz cavity provided by the present invention consists of three parts: a surface layer 1 with small holes, sound insulation cotton 2 with Helmholtz cavity, and a ship hull steel plate 3.

[0019] The surface layer 1 can be thin sheet metal, fiberglass cloth or aluminum foil; the sound insulation cotton 2 is arranged in a certain pattern with Helmholtz cavities 4, and the diameter and depth of the neck of the Helmholtz cavity 4 and the diameter and depth of the cavity can be varied according to the main frequency of the noise to be isolated.

[0020] like Figure 3 As shown, sound insulation cotton is bonded to the ship's steel plate using adhesive; a surface layer is bonded to the sound insulation cotton using adhesive.

[0021] When airborne noise propagates into the Helmholtz cavity of the sound insulation cotton, the air column at the neck of the Helmholtz cavity vibrates violently due to resonance. It rubs against the side wall of the neck of the Helmholtz cavity, i.e., the sound insulation cotton, and generates viscous loss, converting some of the sound energy into heat energy, thus dissipating energy and reducing noise transmission.

[0022] This invention can improve sound insulation performance while reducing the amount of sound insulation cotton used, without increasing the thickness of the sound insulation cotton or using higher density sound insulation cotton.

[0023] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification are within the scope of the present invention.

Claims

1. A sound insulation structure with a Helmholtz cavity, characterized in that: It consists of three parts: hull steel plates, sound insulation cotton with Helmholtz cavity laid flat and bonded to the steel plates, and surface layer bonded to the sound insulation cotton.

2. The sound insulation structure according to claim 1, characterized in that: The Helmholtz chambers are arranged on the sound insulation cotton according to a certain pattern.

3. The sound insulation structure according to claim 1, characterized in that: The sound insulation cotton is bonded to the ship's steel plates using adhesive.

4. The sound insulation structure according to claim 1, characterized in that: The surface layer is bonded to the sound insulation cotton with adhesive.

5. The sound insulation structure according to claim 1, characterized in that: Circular holes are left at the positions corresponding to the Helmholtz cavities on the surface layer.

6. The sound insulation structure according to claim 5, characterized in that: The diameter of the circular hole corresponds to the diameter of the Helmholtz cavity.

7. The sound insulation structure according to claim 1, characterized in that: The surface layer is a thin sheet of galvanized iron.

8. The sound insulation structure according to claim 1, characterized in that: The surface layer is a thin glass fiber cloth.

9. The sound insulation structure according to claim 1, characterized in that: The surface layer is aluminum foil.

10. The sound insulation structure according to claim 1, characterized in that: The neck diameter and depth of the Helmholtz cavity, as well as the diameter and depth of the cavity body, vary according to the main frequency of the noise to be isolated.

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