CN219236949U - Cabin noise reduction system - Google Patents
Cabin noise reduction system Download PDFInfo
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- CN219236949U CN219236949U CN202320361687.6U CN202320361687U CN219236949U CN 219236949 U CN219236949 U CN 219236949U CN 202320361687 U CN202320361687 U CN 202320361687U CN 219236949 U CN219236949 U CN 219236949U
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- noise reduction
- reduction system
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Abstract
The utility model provides a cabin noise reduction system which comprises an outer shell and an inner shell, wherein a floating raft frame is arranged between the outer shell and the inner shell, a frame main body of the floating raft frame is connected with the outer shell through at least one flexible connecting piece, the inner shell is composed of sound insulation plates, auxiliary equipment or electromechanical equipment and equipment are fixed on the floating raft frame, and the floating raft frame is connected with the inner shell through a second connecting piece. According to the cabin noise reduction system, the multilayer buffering vibration isolation device is arranged in the vibration transmission way, the modularized and integrated design concept is adopted, the wall plates of the inner shell are arranged on the public elastic frame, the floating raft frame is formed into a large-mass intermediate body, the whole vibration isolation concept is adopted for the floating raft frame, the large-mass vibration reduction effect is utilized, the whole vibration isolation efficiency of the system is improved, vibration transmission is effectively attenuated, high-efficiency vibration isolation of medium and low frequencies is achieved, and secondary structural noise radiation of the sound insulation plates is avoided.
Description
Technical Field
The utility model relates to the technical field of vibration reduction and noise reduction, in particular to a cabin noise reduction system.
Background
With the rapid development of vehicles such as subways, vehicles and ships, the requirements of passengers on acoustic comfort are continuously improved, and the problem of noise in the space of a passenger cabin is increasingly emphasized.
Currently, in order to control the noise level of an occupant area, a sound absorbing and insulating interior material is generally added inside a cabin, and the noise level is controlled to a certain extent. However, the sound absorbing and insulating interior decorative plate is usually directly fixed on a frame beam of a vehicle body, low-frequency structural noise caused by vehicle body power equipment is inevitably transmitted into the plate, and secondary structural radiation noise of the plate is further caused, so that the sound absorbing and insulating plate has large general theoretical sound insulating quantity, and the actual sound insulating quantity is greatly reduced. In order to obtain better noise reduction effect, a noise reduction mode of increasing the space thickness and the weight of the sound insulation interior trim part is needed, and even so, the improved control measure is effective to the medium-high frequency effect, but the medium-low frequency noise is still difficult to effectively control, and the cost is high.
Disclosure of Invention
In view of the foregoing, the present utility model is directed to a cabin noise reduction system to solve the technical problem of insufficient sound insulation of low frequency noise in the cabin in the prior art.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
the utility model provides a cabin noise reduction system, includes outer shell, interior casing set up the buoyant raft frame between outer shell with interior casing, the frame main part of buoyant raft frame pass through at least one flexible connection spare with outer shell is connected, interior casing comprises sound insulation panel fixed auxiliary assembly or electromechanical and equipment on the buoyant raft frame, buoyant raft frame pass through the second connecting piece with interior casing is connected.
Further, the inner shell comprises a floor, side wall plates and a ceiling, wherein the floor, the side wall plates and the ceiling are surrounded to form an approximately closed surrounding wall structure, the floor and the ceiling are arranged at the upper end and the lower end of the side wall plates, and a sound insulation sealing structure is arranged in a corner gap area of the floor, the side wall plates and the ceiling.
Further, the sound-insulating sealing structure is a baffle sound-insulating sealing structure formed by rubber strips or metal strips.
Further, the floor, the side wall plate and the ceiling are prepared by any one or a combination of a plurality of paper honeycomb plates, aluminum honeycomb plates, perforated sound-absorbing composite plates, glass fiber reinforced plastic plates and damping sandwich plates.
Further, the ceiling is prepared from a perforated sound-absorbing composite board, and comprises a perforated board cover, sound-absorbing fiber cotton and an outer wrapping non-woven fabric, wherein the perforation ratio of the perforated board cover is 5% -30%; and/or the side wall plate and the floor adopt honeycomb plates, the honeycomb plates comprise a middle layer, the middle layer is an aluminum honeycomb with periodical holes, and constraint layers are arranged on the upper surface and the lower surface of the middle layer.
Further, sound-absorbing cotton is filled between the outer shell and the inner shell, and the sound-absorbing cotton is any one or a combination of a plurality of superfine glass cotton, polyester fiber cotton, melamine foam cotton and phenolic foam cotton.
Further, the frame body comprises a first connecting beam and a second connecting beam, the first connecting beam and the second connecting beam are arranged in a crisscross manner, the upper ends of the first connecting beam and/or the second connecting beam are connected with the ceiling through a bending part, the lower ends of the first connecting beam and/or the second connecting beam are connected with the floor through another bending part, and the bending part is rigidly connected with the first connecting beam and/or the second connecting beam through a third connecting piece, or the bending part is flexibly connected with the first connecting beam and/or the second connecting beam through a third connecting piece.
Further, the first connecting beam and/or the second connecting beam are/is elastic structural members formed by one or more of rectangular, C-shaped, U-shaped and I-shaped through welding, assembling or integral molding.
Further, the flexible connecting piece is one or more of a rubber vibration isolator, a metal spring vibration isolator or a steel wire rope vibration isolator and an air bag vibration isolator.
Further, the flexible connecting piece, the second connecting piece and the third connecting piece are arranged at a structural mode node position or a corner position or a local high-rigidity area.
Compared with the prior art, the cabin noise reduction system has the following advantages:
(1) The application cabin noise reduction system, low frequency sound insulation volume is not enough in to current carriage noise, the sound insulation panel or auxiliary assembly self that fix on the car casing receives vibration excitation power and becomes the noise source, the sound insulation ability that leads to panel can not obtain full play or even the phenomenon that local frequency channel became invalid, through setting up the elastic structure body of middle floating raft frame, arrange sound insulation panel and auxiliary assembly as far as on the floating raft frame, set up multistage vibration isolation and utilize the big mass damping effect of floating raft in vibration transmission route, can realize the high-efficient vibration isolation of well low frequency, effectively avoid the secondary structure radiation noise of panel.
(2) According to the cabin noise reduction system, the multilayer buffering vibration isolation device is arranged in the vibration transmission way, the modularized and integrated design concept is adopted, the wall plates of the inner shell are installed on the public elastic frame, the frame is installed on the elastic foundation, so that the vibration reduction system is formed, the public elastic floating raft structure is arranged, electromechanical equipment, auxiliary equipment and sound insulation plates in the vehicle are installed on the public elastic frame as intensively as possible, a large-mass intermediate body is formed, the floating raft frame is subjected to an integral vibration isolation thought, the integral vibration isolation efficiency of the system is improved by utilizing the large-mass vibration reduction effect, vibration transmission is effectively attenuated, medium-low frequency efficient vibration isolation is realized, and secondary structural noise radiation of the sound insulation plates is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a schematic diagram of a cabin noise reduction system according to an embodiment of the present utility model;
FIG. 2 is a schematic view of a structure of a raft frame in a cabin noise reduction system according to an embodiment of the present utility model;
reference numerals illustrate:
1-an outer shell; 2-an inner housing; 201-floor; 202-side wall panels; 203-ceiling; 3-floating raft frames; 31-a frame body; 3101-a first connection beam; 3102-a second connecting beam; 3103—a bend; 32-flexible connection; 33-a second connector; 34-a third connector; 4-a sound insulation sealing structure; 5-sound-absorbing cotton.
Detailed Description
In order to facilitate understanding of the technical means, objects and effects of the present utility model, embodiments of the present utility model will be described in detail with reference to the accompanying drawings.
It is to be noted that all terms used for directional and positional indication in the present utility model, such as: "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "low", "lateral", "longitudinal", "center", etc. are merely used to explain the relative positional relationship, connection, etc. between the components in a particular state (as shown in the drawings), and are merely for convenience of description of the present utility model, and do not require that the present utility model must be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model. Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1-2, the utility model discloses a cabin noise reduction system, which comprises an outer shell 1 and an inner shell 2, wherein a floating raft frame 3 is arranged between the outer shell 1 and the inner shell 2, the floating raft frame 3 is connected with the outer shell 1 through at least one flexible connecting piece 32, the inner shell 2 is composed of sound insulation plates, auxiliary equipment or electromechanical equipment and equipment are fixed on the floating raft frame 3, and the floating raft frame 3 is connected with the inner shell 2 through a second connecting piece 33.
The application cabin noise reduction system, constitute the inner shell 2 of nearly confined inlayer shell enclosure wall structural style through setting up inlayer by sound insulation panel, outer shell 1 with automobile body or hull shell formation, constitute the double-deck shell structure in cabin, through the buoyant raft frame 3 structure that sets up between double-deck shell, as public elasticity buoyant raft structure, install auxiliary assembly and several kinds of installation as far as on this buoyant raft frame 3, form the midbody of big quality, utilize big quality damping effect, improve the whole vibration isolation efficiency of system, through taking whole vibration isolation thinking to buoyant raft frame 3, set up single-stage or multistage vibration isolation to attenuate vibration energy in vibration transmission route, avoid sound insulation panel's secondary structure radiation noise, effectively promote the sound insulation noise reduction effect of system.
The cabin noise reduction system, low frequency sound insulation volume is not enough in to current carriage noise, the sound insulation panel or auxiliary assembly of fixing on the car casing receives vibration excitation power to become the noise source, the sound insulation ability that leads to panel can not obtain full play even local frequency band inefficacy phenomenon, through setting up the elastic structure body of middle floating raft frame 3, arrange sound insulation panel and auxiliary assembly on floating raft frame 3 as far as, set up multistage vibration isolation in vibration transmission route and utilize the big mass damping effect of floating raft, can realize the high-efficient vibration isolation of well low frequency, effectively avoid the secondary structure radiation noise of panel.
As a preferred example of the present application, the inner housing 2 includes a floor 201, side wall plates 202 and a ceiling 203, the floor 201, side wall plates 202 and the ceiling 203 are surrounded by a wall structure which is approximately closed, the floor 201 and the ceiling 203 are disposed at upper and lower opposite ends of the side wall plates 202, and a sound insulation sealing structure 4 is disposed at corner gap regions of the floor 201, the side wall plates 202 and the ceiling 203. As an example of the present utility model, the sound insulation sealing structure 4 is a barrier sound insulation sealing structure formed by a rubber strip or a metal strip. On the one hand, the arrangement meets the requirement of using balls in the inner space of the vehicle cabin, is convenient to process and manufacture, simultaneously ensures the vibration reduction, noise reduction and sound insulation effects in the cabin, and improves the comfort of passengers in a riding area.
As a preferred example of the present application, the floor 201, the side wall plate 202, and the ceiling 203 are made of any one or more of paper honeycomb board, aluminum honeycomb board, perforated sound absorbing composite board, glass fiber reinforced plastic board, and damping sandwich board. As a specific example of the present application, the floor 201, the side wall plate 202, and the ceiling 203 are sound absorbing and insulating plates having a certain thickness, so as to ensure the vibration and noise reduction and insulation effects of the vehicle cabin.
As a preferred example of the present application, the ceiling 203 is made of a perforated sound-absorbing composite board, and comprises a perforated panel facing, sound-absorbing fiber cotton and an outer wrapping nonwoven fabric, wherein the perforation ratio of the perforated panel facing is 1% to 50%, preferably 5% to 30%, such as 15%. This arrangement discloses a preferable structure of the ceiling 203, which reduces the weight of the ceiling, ensures convenience and stability of the overall assembly of the inner housing 2, and improves the internal sound insulation effect of the vehicle cabin.
As a preferred example of the present application, the side wall plate 202 and the floor 201 are honeycomb plates, and include an intermediate layer, wherein the intermediate layer is an aluminum honeycomb with periodic holes, and constraint layers are arranged on the upper surface and the lower surface of the intermediate layer. This arrangement discloses a preferred structure of the side wall plate 202, the floor 201, which on the one hand enhances the supporting strength of the side wall plate 202, the floor 201, and on the other hand further improves the sound-insulating effect of the interior of the vehicle cabin.
As a preferred example of the present application, sound-absorbing cotton 5 is filled between the outer shell 1 and the inner shell 2, and the sound-absorbing cotton 5 is any one or a combination of a plurality of ultra-fine glass cotton, polyester fiber cotton, melamine foam cotton and phenolic foam cotton. This setting avoids sound insulation panel's secondary structure radiation noise to pass into the cabin, has further promoted cabin noise reduction system's noise insulation noise reduction effect.
As a preferred example of the present application, the frame body 31 includes a first connecting beam 3101 and a second connecting beam 3102, the first connecting beam 3101 and the second connecting beam 3102 are disposed in a crisscross arrangement, an upper end of the first connecting beam 3101 and/or the second connecting beam 3102 is connected to the ceiling 203 through a bending portion 3103, and a lower end of the first connecting beam 3101 and/or the second connecting beam 3102 is connected to the floor 201 through another bending portion 3103. Preferably, the first connecting beam 3101 and/or the second connecting beam 3102 are made of an elastic structural member formed by welding, assembling or integrally forming a rectangular, C-shaped, U-shaped, i-shaped, and the first connecting beam 3101 and/or the second connecting beam 3102 are connected to the side wall plate 202. On the one hand, the strength of the floating raft frame 3 is enhanced, the large-mass vibration reduction effect of the floating raft frame 3 is improved, the integral vibration isolation efficiency of the system is improved, vibration transmission is effectively attenuated, and secondary structural noise radiation of the sound insulation plates is avoided.
As a preferred example of the present application, the flexible connection unit 32 is one or more of a rubber vibration isolator, a metal spring vibration isolator, a wire rope vibration isolator, and an air bag vibration isolator. This arrangement further improves the reliability of the overall vibration isolation of the buoyant raft frame 3.
The bending portion 3103 is rigidly connected to the first connecting beam 3101 and/or the second connecting beam 3102 by a third connecting member 34, or the bending portion 3103 is flexibly connected to the first connecting beam 3101 and/or the second connecting beam 3102 by a third connecting member 34. As a preferred example of the present application, the first connecting beam 3101 is disposed transversely, the second connecting beam 3102 is disposed longitudinally, the first connecting beam 3101 and the second connecting beam 3102 are disposed in plurality, the bending portion 3103 at the upper end of the second connecting beam 3102 is rigidly or flexibly connected to the upper end of the second connecting beam 3102 through a third connecting member 34, and the bending portion 3103 at the lower end of the second connecting beam 3102 is rigidly or flexibly connected to the lower end of the second connecting beam 3102 through another third connecting member 34.
As a preferred example of the present application, the flexible connection 32, the second connection 33, and the third connection 34 are arranged at a structural mode node position or a corner position or a region where local rigidity is large. This arrangement avoids the transfer of vibrational energy as much as possible.
According to the cabin noise reduction system, the multilayer buffering vibration isolation device is arranged in a vibration transmission way, the modularized and integrated design concept is adopted, the wall plates of the inner shell 2 are installed on a public elastic frame, the frame is installed on an elastic basis, so that the vibration reduction system is formed, electromechanical equipment, auxiliary equipment and sound insulation plates in a vehicle are installed on the public elastic frame as intensively as possible through the public elastic floating raft structure, a large-mass intermediate body is formed, the floating raft frame 3 is subjected to an integral vibration isolation thought, the integral vibration isolation efficiency of the system is improved by utilizing the large-mass vibration reduction effect, vibration transmission is effectively attenuated, high-efficiency vibration isolation of medium and low frequencies is realized, and secondary structural noise radiation of the sound insulation plates is avoided.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (8)
1. The utility model provides a cabin noise reduction system, its characterized in that, includes outer shell (1), inner shell (2) outer shell (1) with set up raft frame (3) between inner shell (2), frame main part (31) of raft frame (3) through at least one flexible connection piece (32) with outer shell (1) are connected, inner shell (2) are constituteed by sound insulation panel fixed auxiliary assembly or electromechanical and equipment on raft frame (3), raft frame (3) through second connecting piece (33) with inner shell (2) are connected.
2. Cabin noise reduction system according to claim 1, characterized in that the inner housing (2) comprises a floor (201), side wall plates (202) and a ceiling (203), the floor (201), side wall plates (202) and ceiling (203) enclose an approximately closed enclosure wall structure, the floor (201) and the ceiling (203) are arranged at the upper and lower opposite ends of the side wall plates (202), and sound insulation sealing structures (4) are arranged in corner gap areas of the floor (201), the side wall plates (202) and the ceiling (203).
3. Cabin noise reduction system according to claim 2, characterized in that the sound-insulating sealing structure (4) is a barrier sound-insulating sealing structure formed by rubber strips or metal strips.
4. Cabin noise reduction system according to claim 2, characterized in that the ceiling (203) comprises a perforated panel facing, sound absorbing fibre cotton and an outer wrap nonwoven, wherein the perforation ratio of the perforated panel facing is 5-30%; and/or the side wall plate (202) and the floor (201) adopt honeycomb plates, and comprise an intermediate layer, wherein the intermediate layer is an aluminum honeycomb with periodical holes, and a restraint layer is arranged on the upper surface or the lower surface of the intermediate layer.
5. Cabin noise reduction system according to claim 2, characterized in that between the outer shell (1) and the inner shell (2) sound absorbing cotton (5) is filled.
6. Cabin noise reduction system according to claim 2 or 5, characterized in that the frame body (31) comprises a first connecting beam (3101) and a second connecting beam (3102), the first connecting beam (3101) and the second connecting beam (3102) being arranged in a criss-cross, the upper end of the first connecting beam (3101) and/or the second connecting beam (3102) being connected to the ceiling (203) by a bend (3103), the lower end of the first connecting beam (3101) and/or the second connecting beam (3102) being connected to the floor (201) by a further bend (3103), the bend (3103) being rigidly connected to the first connecting beam (3101) and/or the second connecting beam (3102) by a third connecting piece (34), or the bend (3103) being connected to the first connecting beam (3101) and/or the second connecting beam (3102) by a third connecting piece (34).
7. The cabin noise reduction system according to claim 6, characterized in that the first connection beam (3101) and/or the second connection beam (3102) are made of one or more of rectangular, C-shaped, U-shaped, i-shaped elastic structural members by welding, assembly or integral molding.
8. Cabin noise reduction system according to claim 7, characterized in that the flexible connection (32), the second connection (33), the third connection (34) are arranged in structural mode node positions or corner positions or in regions of locally great rigidity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320361687.6U CN219236949U (en) | 2023-03-02 | 2023-03-02 | Cabin noise reduction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320361687.6U CN219236949U (en) | 2023-03-02 | 2023-03-02 | Cabin noise reduction system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219236949U true CN219236949U (en) | 2023-06-23 |
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ID=86811432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320361687.6U Active CN219236949U (en) | 2023-03-02 | 2023-03-02 | Cabin noise reduction system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219236949U (en) |
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2023
- 2023-03-02 CN CN202320361687.6U patent/CN219236949U/en active Active
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