Porous structure helicopter noise reduction and sound absorption plate based on SLM technology

Abstract

The utility model discloses a helicopter noise reduction acoustic board with a porous structure based on an SLM technology, and belongs to the technical field of acoustic boards. A porous structure helicopter noise reduction and sound absorption plate based on the SLM technology comprises a plate and is characterized by further comprising a reinforcing plate of a #-shaped structure, a cavity is formed in the plate, the reinforcing plate is fixedly arranged in the cavity, first sound absorption holes are evenly formed in the top of the plate, and the inner bottom of the cavity is of a corrugated structure; the reinforcing plate of the #-shaped structure is fixedly arranged in the cavity, the strength of the top end face of the plate can be improved, the deformation phenomenon is reduced, the service life is prolonged, the inner bottom end face of the cavity is designed to be of the corrugated structure, sound waves are reflected back and forth in the cavity, the sound absorption surface area of the cavity is increased, and the sound absorption effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sound-absorbing panels, in particular to a helicopter noise reduction sound-absorbing panel with a porous structure based on the SLM technology. Background Art

[0002] Selective Laser Melting (SLM) is a major technical approach in additive manufacturing of metal materials. This technology uses laser as an energy source to scan the metal powder bed layer by layer according to the path planned in the 3D CAD slice model. Through the melting and solidification process of the scanned metal powder, metallurgical bonding is achieved, and finally the metal parts designed by the model are obtained. SLM technology can directly form metal parts that are almost fully dense and have good mechanical properties, overcoming the troubles of traditional technology in manufacturing metal parts with complex shapes. The noise reduction sound-absorbing panel of the helicopter is a device specially used to reduce the noise of the helicopter engine and rotor, which helps to improve the flight noise level of the helicopter, improve the comfort of pilots and passengers, and reduce noise pollution to the surrounding environment. The sound-absorbing panel processed by selective laser melting technology can accurately print sound-absorbing panels with complex geometric shapes.

[0003] The sound absorbing panels in the prior art have poor sound absorbing effects, which reduces the comfort of pilots and passengers. In addition, since the top end surface of the sound absorbing panels is thin and has low strength, they are prone to dents, which affects their service life. Utility Model Content

[0004] The utility model aims to solve the problems of poor sound absorption effect and low strength in the prior art, and proposes a helicopter noise reduction and sound absorption board with a porous structure based on the SLM technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A porous helicopter noise reduction and sound-absorbing panel based on SLM technology comprises a panel, characterized in that it also comprises a reinforcing plate in a "well"-shaped structure, wherein a cavity is opened in the panel, the reinforcing plate is fixedly arranged in the cavity, first sound-absorbing holes are evenly opened on the top of the panel, and the inner bottom of the cavity is a corrugated structure.

[0007] In order to improve the sound absorption effect and the strength of the plate, preferably, a corrugated plate is fixedly arranged in the cavity, and a second sound absorption hole is opened on the corrugated plate.

[0008] In order to achieve a "maze" effect, further, the corrugated plates are provided in multiple groups, the multiple groups of corrugated plates are distributed at intervals up and down along the axis of the first sound absorbing hole, and the diameters of the second sound absorbing holes on the multiple groups of corrugated plates decrease successively from top to bottom.

[0009] In order to increase the sound absorption frequency range of the panel, further, the thickness of the plurality of groups of corrugated panels decreases from top to bottom along the axis of the first sound absorption hole.

[0010] Preferably, a through groove in a U-shaped structure is formed on the side wall of the plate, and a receiving groove is formed on the top end surface of the through groove.

[0011] Preferably, the plate is made of titanium alloy.

[0012] Compared with the prior art, the utility model provides a helicopter noise reduction and sound absorbing board with a porous structure based on SLM technology, which has the following beneficial effects:

[0013] 1. The SLM-based porous helicopter noise reduction and sound-absorbing panel can improve the strength of the top end surface of the panel, reduce deformation, and increase service life by fixing a reinforcing plate in a "well"-shaped structure in the cavity. In addition, the inner bottom end surface of the cavity is designed as a corrugated structure, so that the sound waves are reflected back and forth in the cavity, increasing its sound absorption surface area and improving the sound absorption effect.

[0014] 2. The porous helicopter noise reduction and sound-absorbing panel based on SLM technology has multiple groups of corrugated plates fixed in the cavity, and a second sound-absorbing hole is opened on the corrugated plates. In addition, the thickness of the corrugated plates is different. On the one hand, the overall strength of the plate can be increased. On the other hand, multiple layers of corrugated plates of different thicknesses can increase the sound absorption frequency range of the plate and improve the sound absorption effect.

[0015] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The utility model can improve the strength of the top end surface of the plate, reduce deformation, and increase the service life by fixing a reinforcing plate in a "well" shaped structure in the cavity. The inner bottom end surface of the cavity is designed to be a corrugated structure, so that the sound waves are reflected back and forth in the cavity, thereby increasing its sound absorption surface area and improving the sound absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a porous helicopter noise reduction and sound-absorbing panel based on SLM technology proposed in the utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of a porous helicopter noise reduction and sound-absorbing panel based on SLM technology proposed in the utility model. Figure 2 ;

[0018] Figure 3 This is a cross-sectional view of a helicopter noise reduction and sound-absorbing panel with a porous structure based on SLM technology proposed in the utility model;

[0019] Figure 4 A multi-porous helicopter noise reduction and sound-absorbing board based on SLM technology proposed in this utility model Figure 3 Enlarged view of part A.

[0020] In the figure: 1, plate; 101, cavity; 102, first sound absorbing hole; 103, reinforcement plate; 2, corrugated plate; 201, second sound absorbing hole; 3, through groove; 301, receiving groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] Example:

[0024] Reference Figure 1-Figure 4 A helicopter noise reduction and sound-absorbing panel with a porous structure based on SLM technology includes a panel 1, which can be circular or polygonal. Here, we prefer polygonal and square. It also includes a reinforcing plate 103 in a "well"-shaped structure, wherein a cavity 101 is opened in the panel 1, and the reinforcing plate 103 is fixedly arranged in the cavity 101, and the top and bottom of the reinforcing plate 103 are respectively against the inner top and inner top of the cavity 101, which can support the top of the panel 1, reduce the deformation when the top of the panel 1 is pressed, and improve the overall strength. The first sound-absorbing hole 102 is evenly opened on the top of the panel 1, and the diameter of the first sound-absorbing hole 102 is greater than the diameter of the second sound-absorbing hole 201, ranging from 1mm to 8mm, and here we prefer 4mm, and the inner bottom of the cavity 101 is designed as a corrugated structure, which can make the sound waves reflect back and forth in the cavity 101, increase its sound-absorbing surface area, and increase the sound-absorbing effect.

[0025] When in use, by fixing a reinforcing plate 103 in a "well"-shaped structure in the cavity 101, the strength of the top end surface of the plate 1 can be improved, deformation can be reduced, and the service life can be improved. In addition, the inner bottom end surface of the cavity 101 is designed to be a corrugated structure, so that sound waves are reflected back and forth in the cavity 101, thereby increasing its sound absorption surface area and improving the sound absorption effect. By fixing multiple groups of wave plates 2 in the cavity 101, second sound absorption holes 201 are opened on the wave plates 2, and the thickness of the wave plates 2 is different, on the one hand, the overall strength of the plate 1 can be increased, and on the other hand, multiple layers of wave plates 2 with different thicknesses can increase the sound absorption frequency range of the plate 1 and improve the sound absorption effect.

[0026] Reference Figure 2-Figure 4 A corrugated plate 2 is fixedly arranged in the cavity 101, and a second sound-absorbing hole 201 is opened on the corrugated plate 2. By fixing the corrugated plate 2 in the cavity 101, on the one hand, the corrugated structure can make the sound waves reflect back and forth in the cavity 101, thereby increasing its sound-absorbing surface area and improving the sound-absorbing effect; on the other hand, the strength of the plate 1 can be improved, thereby increasing the service life.

[0027] Reference Figure 2-Figure 4 We arrange multiple groups of wave plates 2, the wave plates 2 are arranged in two to ten groups, preferably three groups, and the three groups of wave plates 2 are distributed at intervals along the axis of the first sound-absorbing hole 102, and the diameters of the second sound-absorbing holes 201 on the multiple groups of wave plates 2 are reduced from top to bottom. When in use, by arranging three groups of wave plates 2 in the cavity 101, second sound-absorbing holes 201 with different diameters are sequentially opened on the three layers of wave plates 2, which has a certain "maze" effect, can realize multiple reflections of sound waves in the cavity 101, thereby dissipating the directionality and random propagation of sound waves, and improving the sound absorption effect.

[0028] Reference Figure 4 The thickness of the three groups of corrugated plates 2 decreases from top to bottom along the axis of the first sound-absorbing hole 102, and the thickness of the topmost corrugated plate 2 is smaller than the thickness from the top of the cavity 101 to the top of the plate 1. When in use, by fixing the corrugated plates 2 with different thicknesses in the cavity 101, the sound absorption frequency range of the plate 1 can be increased and the sound absorption effect can be improved.

[0029] Reference Figure 1 and Figure 2 A through slot 3 with a U-shaped structure is provided on the side wall of the plate 1, and a receiving slot 301 is provided on the top end surface of the through slot 3. The through slots 3 are symmetrically arranged in multiple groups, preferably four groups. When in use, the through slots 3 and the receiving slots 301 can be used to fix the plate 1 with screws, and the fixing effect is reliable. It will not fall off during use, thereby improving the fixing effect.

[0030] Reference Figure 1-Figure 3The plate 1, the corrugated plate 2 and the reinforcing plate 103 are integrally formed by SLM technology, and the materials of the plate 1, the corrugated plate 2 and the reinforcing plate 103 are all titanium alloy or aluminum alloy. Here, we prefer titanium alloy. On the one hand, titanium alloy has high mechanical properties, excellent corrosion resistance and high temperature performance, which can improve the strength and service life of the sound-absorbing panel. On the other hand, titanium alloy is light in weight, which can improve the use effect.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A helicopter noise reduction and sound absorption panel with a porous structure based on SLM technology, comprising a panel (1), characterized in that: Also includes The reinforcing plate (103) has a "well"-shaped structure. A cavity (101) is provided in the plate (1), the reinforcing plate (103) is fixedly arranged in the cavity (101), first sound-absorbing holes (102) are evenly provided on the top of the plate (1), and the inner bottom of the cavity (101) is in a corrugated structure.

2. According to claim 1, a porous structure helicopter noise reduction and sound absorbing panel based on SLM technology is characterized in that: A wave plate (2) is fixedly arranged in the cavity (101), and a second sound absorbing hole (201) is opened on the wave plate (2).

3. The porous structure helicopter noise reduction and sound absorbing panel based on SLM technology according to claim 2 is characterized in that: The wave plates (2) are provided in a plurality of groups, the plurality of groups of wave plates (2) are spaced apart from each other along the axis of the first sound absorbing hole (102), and the diameters of the second sound absorbing holes (201) on the plurality of groups of wave plates (2) decrease from top to bottom.

4. The porous structure helicopter noise reduction and sound absorbing panel based on SLM technology according to claim 3 is characterized in that: The thickness of the plurality of groups of wave plates (2) decreases from top to bottom along the axis of the first sound absorbing hole (102).

5. The porous structure helicopter noise reduction and sound absorbing panel based on SLM technology according to claim 1 is characterized in that: A through slot (3) with a U-shaped structure is provided on the side wall of the plate (1), and a receiving slot (301) is provided on the top end surface of the through slot (3).

6. The porous structure helicopter noise reduction and sound absorbing panel based on SLM technology according to claim 1 is characterized in that: The plate (1) is made of titanium alloy.

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