Multi-labyrinth-channel sound absorption structure with porous lining for high-speed train

Abstract

The utility model belongs to the technical field of noise reduction of rail transit structures, and particularly relates to a multi-labyrinth-channel sound absorption structure with a porous lining for a high-speed train. The utility model aims to provide the multi-labyrinth-channel sound absorption structure for the high-speed train, which is provided with the porous lining and has the characteristics of high strength, light weight and good noise reduction effect. According to the technical scheme, the multi-labyrinth-channel sound absorption structure with the porous lining for the high-speed train is characterized by comprising a middle layer and panels, wherein the middle layer is composed of at least one labyrinth unit, and the panels are arranged on the two sides of the middle layer; the labyrinth unit is internally provided with two L-shaped sound absorption channels which are rotationally and symmetrically arranged and communicate with the panels on the two sides. The sound absorption channel comprises a rectangular sound absorption channel and a square sound absorption channel which are communicated with each other.

Description

TECHNICAL FIELD

[0001] The utility model belongs to rail transit structure noise reduction technical field, especially is involved in a kind of multi-labyrinth passage sound absorption structure for high-speed train with porous lining. BACKGROUND

[0002] In the current rail transport field, especially in the design and development of high-speed train, reducing noise pollution is a key challenge. The running of high-speed train can produce very high aerodynamic noise and wheel-rail noise, and the reverberation noise in the tunnel is particularly prominent, which greatly reduces the comfort of passengers. To solve this problem, many vibration and noise reduction technologies have been proposed and implemented, including the use of sound insulation materials and structural optimization design.

[0003] The use of sound-absorbing materials is one of the most common solutions. Traditional sound-absorbing materials include porous sound-absorbing materials and resonant sound-absorbing materials. Porous materials have good sound absorption capacity for high-frequency sound waves, but the sound absorption effect for low-frequency sound waves is not satisfactory. If you want to broaden the sound absorption frequency band and improve the sound absorption effect of low frequency, you can only increase the thickness of the material. However, in the design of high-speed train noise control, lightweight assessment of sound-absorbing materials is also an important reference standard. The sound absorption performance of resonant sound-absorbing materials is heavily dependent on the resonant frequency of the structure. The structure has good sound absorption performance near the resonant frequency. As the frequency increases, its sound absorption performance decreases rapidly. Although it can reduce noise propagation to some extent, the effect may be limited when facing the complex and variable noise spectrum of high-speed trains. Therefore, it is necessary to develop a new type of sound absorption structure that can effectively absorb and reduce noise generated during train operation while maintaining the strength and lightweight of the train structure, especially the low-frequency noise that is difficult to effectively isolate by the current high-speed train body shell. SUMMARY

[0004] The utility model aims at overcoming the deficiencies in the above background art, and provides a multi-labyrinth passage sound absorption structure for high-speed train with porous lining, which should have the characteristics of high strength, lightweight and good noise reduction effect.

[0005] The technical solution of the utility model is as follows:

[0006] A multi-labyrinth passage sound absorption structure for high-speed train with porous lining, characterized by: an intermediate layer composed of at least one labyrinth unit and a panel arranged on both sides of the intermediate layer; the labyrinth unit is internally provided with two rotationally symmetrical L-shaped sound absorption channels connected to the two panels; the sound absorption channel includes a rectangular sound absorption channel and a square sound absorption channel connected to each other.

[0007] The rectangular sound absorption channel is clockwise spiral, and the square sound absorption channel is counterclockwise spiral.

[0008] The labyrinth unit is a framework with a lining; the framework comprises a frame on the outside and an intermediate partition, a rectangular partition and a square partition inside the frame.

[0009] The two sound absorption channels are separated by the intermediate partition; the two sides of the intermediate partition are provided with the rectangular partition and the square partition; the rectangular partition spirals clockwise and encloses the rectangular sound absorption channel; and the square partition spirals counterclockwise and encloses the directional sound absorption channel.

[0010] The rectangular sound absorption channel comprises a first rectangular channel, a second rectangular channel, a third rectangular channel, a fourth rectangular channel, a fifth rectangular channel, a sixth rectangular channel and a seventh rectangular channel in sequence from inside to outside.

[0011] The square sound absorption channel comprises a first square channel, a second square channel, a third square channel, a fourth square channel, a fifth square channel, a sixth square channel, a seventh square channel, an eighth square channel and a ninth square channel in sequence from inside to outside.

[0012] The first rectangular channel, the third rectangular channel, the fifth rectangular channel and the seventh rectangular channel are arranged in parallel; the first square channel, the third square channel, the fifth square channel, the seventh square channel and the ninth square channel are arranged in parallel; the first rectangular channel is perpendicular to the first square channel; and the seventh rectangular channel communicates with the ninth square channel.

[0013] The inner side of the frame and the two sides of the intermediate partition, the rectangular partition and the square partition are provided with the lining.

[0014] The panel is provided with sound absorption holes.

[0015] The panel is made of resin material; the framework is made of resin material; and the lining is made of porous material.

[0016] The utility model discloses the beneficial effect is:

[0017] 1, the utility model discloses a single helical labyrinth is built with resin framework, utilizes the characteristic that labyrinth structure space folds and coils, fully prolongs the propagation distance of sound wave in sound absorption structure, and the interaction space between sound wave and sound transmission channel is increased;

[0018] 2, the utility model discloses covering porous lining outside the framework, so that sound wave is dissipated by porous lining constantly while reflecting, and the energy of sound wave is greatly weakened greatly;

[0019] 3, the sound absorption hole reserved on the panel of the utility model makes low-frequency noise that transmits into the inside of the vehicle shell can fully incident labyrinth structure;

[0020] 4. The labyrinth unit of the utility model has two L-shaped sound absorption channels which are inlaid and can play the role of local resonance, the resonance frequency of the sound absorption channels is close, and therefore good coupling performance is obtained, and excellent sound absorption performance for low-frequency noise is shown;

[0021] 5. The L-shaped sound absorption channel of the labyrinth unit of the utility model adopts rotational symmetry arrangement, so that the shape of the assembled labyrinth unit is more regular, the cost and difficulty of assembly are reduced, only the neat distribution between the interior trim panel and the wood bone needs to be ensured, the installation and disassembly of the interior trim panel are not affected, and lightweight assembly is realized.

[0022] 6. The utility model is easy to process and adjust, the size of the sound absorption device is calculated and adjusted by the finite element method in combination with the actual line noise characteristics, and the vibration and noise reduction needs of various lines can be better adapted. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the front view structural schematic diagram (one labyrinth unit) of the utility model.

[0024] Figure 2 is the explosion drawing (four labyrinth units) of the utility model.

[0025] Figure 3 is the three-dimensional structure schematic diagram of the labyrinth unit of the utility model.

[0026] Figure 4 is the overhead structure schematic diagram of the labyrinth unit of the utility model.

[0027] Figure 5 is the three-dimensional structure schematic diagram of the framework of the utility model.

[0028] Figure 6 is the overhead structure schematic diagram of the framework of the utility model.

[0029] Figure 7 is the overhead structure schematic diagram of the sound absorption channel of the utility model.

[0030] Figure 8 is the embodiment schematic diagram of the utility model.

[0031] Figure 9 is the finite element model schematic diagram of the utility model for designing, modifying and evaluating the noise reduction effect of the multi-labyrinth channel sound absorption structure.

[0032] Figure 10 is the sound absorption coefficient curve diagram of the multi-labyrinth channel sound absorption structure of the embodiment of the utility model.

[0033] Figure 11It is the multi-labyrinth passage sound absorption structure of the embodiment of the utility model under certain typical line conditions.

[0034] Reference signs:

[0035] Intermediate layer 1, skeleton 1-1, frame 1-1-1, intermediate partition 1-1-2, rectangular partition 1-1-3, square partition 1-1-4, inner lining 1-2, rectangular sound absorption passage 1.1, first rectangular passage 1.1.1, second rectangular passage 1.1.2, third rectangular passage 1.1.3, fourth rectangular passage 1.1.4, fifth rectangular passage 1.1.5, sixth rectangular passage 1.1.6, seventh rectangular passage 1.1.7, square sound absorption passage 1.2, first square passage 1.2.1, second square passage 1.2.2, third square passage 1.2.3, fourth square passage 1.2.4, fifth square passage 1.2.5, sixth square passage 1.2.6, seventh square passage 1.2.7, eighth square passage 1.2.8, ninth square passage 1.2.9, panel 2, multi-labyrinth passage sound absorption structure A, inner trim panel B, outer shell C, wood bone D, partition E. DETAILED DESCRIPTION

[0036] In order to make the utility model purposes, technical scheme and advantages more clearly, the following will be further described in detail with the drawings and examples.The specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0037] As Figure 1 shown, a multi-labyrinth passage sound absorption structure with porous inner lining for high-speed train, comprising intermediate layer 1 and panel 2.

[0038] The panel is located on both sides of the intermediate layer, and the panel is arranged with sound absorption holes and made of resin material.The panel is used to fully absorb external noise, especially low-frequency noise filtered by the car body shell into the car body interior.The intermediate layer is composed of at least one labyrinth unit. Figure 2 As

[0039] The labyrinth unit includes skeleton 1-1 and inner lining 1-2.The labyrinth structure is constructed inside the labyrinth unit, thereby forming a sound absorption passage.

[0040] As Figure 4 shown, two L-shaped sound absorption passages are arranged inside the labyrinth unit, and the two sound absorption passages are arranged in 180-degree rotational symmetry and penetrate the thickness direction of the labyrinth unit, thereby connecting the panels on the upper and lower sides of the labyrinth unit.

[0041] As Figure 6As shown, the sound absorption channels include rectangular sound absorption channels 1.1 and square sound absorption channels 1.2, the rectangular sound absorption channels are clockwise spirals from inside to outside, the square sound absorption channels are counterclockwise spirals from inside to outside, and the rectangular sound absorption channels and the square sound absorption channels are communicated with each other, and the two sound absorption channels are not communicated with each other.

[0042] As shown in the figure, the rectangular sound absorption channels are rectangular structures, and the square sound absorption channels are square structures, and the dotted lines in the figure are the track lines of the rectangular sound absorption channels and the square sound absorption channels. The long side of the rectangular sound absorption channel is twice the side length of the square sound absorption channel, so as to ensure that the two L-shaped sound absorption channels can be combined into a complete rectangle. Figure 7

[0043] The rectangular sound absorption channel includes a first rectangular channel 1.1.1, a second rectangular channel 1.1.2, a third rectangular channel 1.1.3, a fourth rectangular channel 1.1.4, a fifth rectangular channel 1.1.5, a sixth rectangular channel 1.1.6, and a seventh rectangular channel 1.1.7, which are sequentially communicated from inside to outside.

[0044] The first rectangular channel, the third rectangular channel, the fifth rectangular channel, and the seventh rectangular channel are arranged in parallel (in the vertical direction). Figure 7 The second rectangular channel communicates one end of the first rectangular channel with one end of the third rectangular channel, the fourth rectangular channel communicates the other end of the third rectangular channel with one end of the fifth rectangular channel, and the sixth rectangular channel communicates the other end of the fifth rectangular channel with one end of the seventh rectangular channel.

[0045] The square sound absorption channel includes a first square channel 1.2.1, a second square channel 1.2.2, a third square channel 1.2.3, a fourth square channel 1.2.4, a fifth square channel 1.2.5, a sixth square channel 1.2.6, a seventh square channel 1.2.7, an eighth square channel 1.2.8, and a ninth square channel 1.2.9, which are sequentially communicated from inside to outside.

[0046] The first square channel, the third square channel, the fifth square channel, the seventh square channel, and the ninth square channel are arranged in parallel (in the horizontal direction). Figure 7 The second square channel communicates one end of the first square channel with one end of the third square channel, the fourth square channel communicates the other end of the third square channel with one end of the fifth square channel, the sixth square channel communicates the other end of the fifth square channel with one end of the seventh square channel, the eighth square channel communicates the other end of the seventh square channel with one end of the ninth square channel, and the other end of the ninth square channel communicates the middle part of the seventh rectangular channel. The first rectangular channel is perpendicular to the first square channel.

[0047] ​The maze unit includes a skeleton 1-1 and an inner lining 1-2. The skeleton includes an outer frame 1-1-1 and an inner partition 1-1-2, a rectangular partition 1-1-3, and a square partition 1-1-4 located inside the frame.

[0048] The middle partition is bent twice in opposite directions, thus dividing the interior of the frame into two L-shaped sound-absorbing channels. Rectangular and square partitions are provided on both sides of the middle partition, thus forming the rectangular and square sound-absorbing channels respectively within the sound-absorbing channels. The rectangular partitions are arranged in a clockwise spiral from the inside out (after four clockwise bends), and the square partitions are arranged in a counter-clockwise spiral from the inside out (after seven counter-clockwise bends).

[0049] The frame is made of resin material. The inner side of the frame, as well as both sides of the middle partition, rectangular partition, and square partition, are provided with the lining. The lining ensures that sound waves can undergo more continuous reflections within the sound-absorbing channel.

[0050] The lining is made of a porous material. This porous material comprises a continuous solid-phase framework and fluid-filled pores, featuring lightweight, heat insulation, fire resistance, and environmental friendliness. It can efficiently absorb and convert sound energy, and is widely available, exhibiting good environmental adaptability and durability. It demonstrates significant effects in sound absorption, vibration reduction, sound insulation, and noise reduction. Melamine boards, which are low-cost, lightweight, and easy to process, can be selected as the porous material.

[0051] like Figure 8 As shown, the high-speed train uses a multi-maze-channel sound-absorbing structure A, arranged at certain intervals within the partition E between the interior panels B and the outer shell C of the high-speed train. First, a grid-like wooden frame D is superimposed on the outer shell. Then, the multi-maze-channel sound-absorbing structure is installed on the wooden frame, which serves as the mounting base for the sound-absorbing structure. Finally, the interior panels (carriage floor) are laid. During installation, multiple maze units can be combined and assembled according to actual needs (e.g., Figure 4 (As shown).

[0052] Before applying the multi-maze channel sound-absorbing structure to high-speed trains, the structure should be adjusted and optimized based on the actual noise distribution inside the train during operation. The specific adjustment method involves first testing the frequency domain distribution of the noise inside the train at the site, and then establishing a finite element model, such as... Figure 9 As shown. The sound absorption coefficient is calculated by applying sound source excitation to the finite element model and modifying the maze height ( Figure 1 The vertical direction, labyrinth width (width of the sound absorption channel), radius of the sound absorption hole, and thickness of the skeleton are all used to make the sound absorption frequency as close as possible to the actual noise characteristic frequency.

[0053] In this embodiment, the dimensions of the multi-maze channel sound-absorbing structure for high-speed trains are set to an overall length of 130mm. Figure 4 (horizontal direction), width is 101mm ( Figure 4 The frame is 40mm thick and the inner lining is 2mm thick, arranged at 0.5m×0.3m intervals under the car floor.

[0054] The sound absorption curve of this structure is as follows: Figure 10 As shown. Using Figure 9 The model in the text evaluates the in-vehicle noise reduction effect on bright lines, such as Figure 11 As shown, comparing the in-vehicle sound pressure level before and after the addition of the sound-absorbing structure, the structure can achieve efficient sound absorption of in-vehicle noise in the range of 30-1000Hz. It has a significant noise reduction effect on the 200-600Hz noise frequency, which is the main contributor to the in-vehicle noise of high-speed trains, and has a noise reduction effect of 3-5dB(A) on the peaks of the main contributing frequencies of 200Hz and 600Hz.

[0055] This embodiment utilizes Figure 9 When the model was used to adjust the size of the multi-maze channel sound-absorbing structure for high-speed trains, it was found that when the width of the maze channel, the radius of the sound-absorbing hole, and the thickness of the skeleton were increased, the noise reduction effect was closer to high-frequency noise; when the overall size of the maze and the number of spiral turns of the sound-absorbing channel were increased, the noise reduction effect was closer to high-frequency noise.

[0056] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. A multi-labyrinth passage sound absorption structure for high-speed trains with a porous lining, characterized by: The invention discloses a sound absorption panel, which comprises an intermediate layer (1) composed of at least one labyrinth unit and panels (2) arranged on both sides of the intermediate layer; the labyrinth unit is internally provided with two L-shaped sound absorption channels arranged in rotational symmetry and connected with the panels on both sides; the sound absorption channels comprise rectangular sound absorption channels (1.1) and square sound absorption channels (1.2) connected with each other.

2. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 1, characterized in that: The rectangular sound absorption channels are arranged in clockwise spiral, and the square sound absorption channels are arranged in counterclockwise spiral.

3. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 2, characterized in that: The labyrinth unit is a framework (1-1) with an inner lining (1-2); the framework comprises a frame (1-1-1) arranged on the outside and an intermediate partition (1-1-2), a rectangular partition (1-1-3) and a square partition (1-1-4) arranged inside the frame.

4. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 3, characterized in that: The two sound absorption channels are separated by the intermediate partition; the two sides of the intermediate partition are provided with the rectangular partition and the square partition; the rectangular partition is arranged in clockwise spiral and encloses the rectangular sound absorption channel; the square partition is arranged in counterclockwise spiral and encloses the square sound absorption channel.

5. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 1 or 4, characterized in that: The rectangular sound absorption channel comprises a first rectangular channel (1.1.1), a second rectangular channel (1.1.2), a third rectangular channel (1.1.3), a fourth rectangular channel (1.1.4), a fifth rectangular channel (1.1.5), a sixth rectangular channel (1.1.6) and a seventh rectangular channel (1.1.7) connected in sequence from inside to outside.

6. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 4, characterized in that: The square sound absorption channel comprises a first square channel (1.2.1), a second square channel (1.2.2), a third square channel (1.2.3), a fourth square channel (1.2.4), a fifth square channel (1.2.5), a sixth square channel (1.2.6), a seventh square channel (1.2.7), an eighth square channel (1.2.8) and a ninth square channel (1.2.9) connected in sequence from inside to outside.

7. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 5, characterized in that: The first rectangular channel, the third rectangular channel, the fifth rectangular channel and the seventh rectangular channel are arranged in parallel; the first square channel, the third square channel, the fifth square channel, the seventh square channel and the ninth square channel are arranged in parallel; the first rectangular channel is perpendicular to the first square channel; the seventh rectangular channel is connected with the ninth square channel.

8. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 3 or 6, characterized in that: The inner side of the frame and the two sides of the intermediate partition, the rectangular partition and the square partition are provided with the inner lining.

9. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 8, characterized in that: The panel is provided with sound absorption holes.

10. The multi-labyrinth passage sound absorption structure with a porous inner liner for a high-speed train according to claim 9, characterized in that: The panel is made of resin material; the framework is made of resin material; and the inner lining is made of porous material.

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