Additional vibration reduction structure and vehicle provided with same
By installing an additional vibration damping structure with an acoustic black hole structure on the vehicle, the problem of reducing noise at specific frequencies in existing technologies has been solved, achieving effective noise reduction and improving the comfort of the in-vehicle environment.
Patent Information
- Application Number
- CN202422965829.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Existing technologies struggle to effectively and economically reduce structural noise at specific frequencies, especially low-frequency vibration noise, as traditional methods are costly or have limited effectiveness.
An additional vibration damping structure is adopted, which forms an acoustic black hole structure on the vibration damping body. The acoustic black hole structure reflects and attenuates the vibration, thereby reducing noise at a specific frequency by fixing it at the vibration source.
It achieves selective reduction of structural noise at specific frequencies, lowers the noise level inside the vehicle, improves the comfort of the driver and passengers, and avoids hearing loss.
Smart Images
Figure CN223679810U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vibration reduction technology, specifically to an additional vibration reduction structure and a vehicle equipped with the additional vibration reduction structure. Background Technology
[0002] When tourist buses, trucks, military vehicles, ships, and aircraft are in operation, their structures generate structural noise due to excitation from the ground and / or engine and / or wind noise, etc. This noise is transmitted into the interior space of the vehicle, and the driver and passengers / occupants experience it. This noise makes the driver / occupants feel uncomfortable, and working in high-decibel noise for a long time can cause fatigue, affecting their operation, rest, and work. In severe cases, it can even lead to hearing loss and other health problems.
[0003] The source of these structural noises is structural vibration. The three elements of noise are: source, transmission path, and receiver. Noise reduction can be achieved by addressing these three elements. When other excitation sources cannot be changed, vibration-damping design of the structure is a very effective method for reducing in-vehicle noise.
[0004] To reduce structural vibration and noise, manufacturers and academia have adopted many traditional vibration reduction methods, such as passive vibration reduction techniques: adding damping sheets or baking damping sheets. However, these techniques cannot reduce vibration at a specific frequency. There are also more expensive active vibration reduction technologies and devices that can reduce vibration at a specific frequency, but they are also costly. Low-frequency vibrations are difficult to attenuate due to their long wavelengths.
[0005] Therefore, how to selectively reduce structural noise at a specific frequency is one of the important problems that urgently need to be solved in this field. Utility Model Content
[0006] The purpose of this invention is to provide an additional vibration damping structure and a vehicle equipped with the additional vibration damping structure, so as to overcome the shortcomings of the prior art, selectively reduce structural noise at specific frequencies, and facilitate manufacturing and installation.
[0007] This utility model provides an additional vibration damping structure, wherein the vibration damping body;
[0008] Along the first direction, the dimensions of the vibration damping body gradually increase or decrease in at least the second direction to form a first surface; the first surface forms the acoustic black hole structure of the vibration damping body;
[0009] The vibration damping body is also provided with a connecting part, which is used to fix it at the position to be damped.
[0010] The additional damping structure as described above, wherein, optionally, the damping body is a plate member;
[0011] The first direction is a length direction of the plate member;
[0012] The second direction is perpendicular to the first direction.
[0013] The additional damping structure as described above, wherein, optionally, the number of the first surfaces is one or two;
[0014] When the number of the first surfaces is one, the first surface forms the acoustic black hole structure with a plane on the opposite side;
[0015] When the number of the first surfaces is two, the two first surfaces are symmetrically arranged.
[0016] The additional damping structure as described above, wherein, optionally, the connecting part is located on at least one side of the damping body;
[0017] The connecting part is perpendicular and / or parallel to the first direction.
[0018] The additional damping structure as described above, wherein, optionally, the connecting part is bonded, clamped or bolted to the position to be damped.
[0019] The additional damping structure as described above, wherein, optionally, the damping body is a column, and at least one end of the damping body is formed with the acoustic black hole structure;
[0020] The acoustic black hole structure gradually decreases in diameter in a direction away from the other end of the damping body.
[0021] The additional damping structure as described above, wherein, optionally, the connecting part is formed with a groove or a protrusion.
[0022] The additional damping structure as described above, wherein, optionally, the number of the damping bodies is multiple.
[0023] The additional damping structure as described above, wherein, optionally, further comprising a damping layer for attenuating vibration, the damping layer is formed on the surface or inside of the damping body.
[0024] The utility model also proposes a vehicle of installing additional damping structure, wherein, including vehicle body and any one of the additional damping structure described above;
[0025] The additional damping structure is fixedly installed on the vehicle body;
[0026] The damping body is fixedly installed at a mode node of a resonance frequency of the vehicle body.
[0027] The vehicle body comprises a hollow member, and the damping main body is fixedly installed inside or outside the hollow member.
[0028] Compared with the prior art, the acoustic black hole structure is formed on the damping main body, the damping main body is fixed on the structure to be damped, and when vibration is transmitted to the acoustic black hole, the vibration is continuously reflected and attenuated, so that the purpose of damping and noise reduction is achieved. The additional damping structure can be fixed on the structure to be damped, the acoustic black hole structure on the additional damping structure can be used to damp the structure to be damped, and the vibration source can be damped. For the vibrating components on the automobile, the purpose of damping and noise reduction can be effectively achieved. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 is a perspective view of the additional damping structure according to the embodiment 1 of the utility model;
[0030] Figure 2 is a perspective view of the damping main body according to the embodiment 1 of the utility model;
[0031] Figure 3 is a schematic view of the mounting structure of the additional damping structure according to the embodiment 1 of the utility model;
[0032] Figure 4 is a three-dimensional sectional view of Figure 3 ;
[0033] Figure 5 is a schematic view of the thickness variation of the acoustic black hole according to the utility model;
[0034] Figure 6 is a perspective view of the first additional damping structure according to the embodiment 2 of the utility model;
[0035] Figure 7 is a perspective view of the second additional damping structure according to the embodiment 2 of the utility model;
[0036] Figure 8 is a perspective view of the third additional damping structure according to the embodiment 2 of the utility model;
[0037] Figure 9 is a perspective view of the third additional damping structure according to the embodiment 2 of the utility model;
[0038] Figure 10 is a schematic view of the mounting structure of the third additional damping structure according to the embodiment 2 of the utility model;
[0039] Figure 11 is a three-dimensional sectional view of Figure 9 ;
[0040] Figure 12 is the fourth additional damping structure perspective view of the embodiment 2 of the utility model;
[0041] Figure 13 is the mounting structure schematic view of the fourth additional damping structure of the embodiment 2 of the utility model.
[0042] Reference signs:
[0043] 1-damping main body, 2-frame, 3-damping layer;
[0044] 11-first surface, 12-acoustic black hole structure, 13-connection part;
[0045] 131-groove. DETAILED DESCRIPTION
[0046] The embodiment described below with reference to the drawings is exemplary and is only used to explain the utility model and can not be explained as the limitation of the utility model.
[0047] In view of the problems in the background art, the utility model proposes the following scheme to achieve.
[0048] Embodiment 1
[0049] Please refer to Figures 1 to 5 The embodiment proposes an additional damping structure, including damping main body 1.In the embodiment, the role of damping main body 1 is mainly fixedly connected with the position to be damped and forms acoustic black hole structure on damping main body 1 to transmit the vibration at the position to be damped to acoustic black hole structure, utilizes acoustic black hole structure, attenuates vibration to achieve the effect of damping.
[0050] Along the first direction, the size of damping main body 1 in at least the second direction gradually increases or decreases, forms first surface 11;The first surface 11 forms the acoustic black hole structure 12 of damping main body 1.The connection part 13 is further provided on damping main body 1, and the connection part 13 is used to be fixedly arranged at the position to be damped.In specific implementation, the first direction can be the length direction of damping main body 1, and the second direction is perpendicular to the length direction of damping main body 1, for example, it can be the width direction.
[0051] Please refer to Figures 1 to 4 In specific implementation, damping main body 1 is fixed on the device to be damped, vibration is transmitted to damping main body 1, vibration is transmitted to acoustic black hole structure, vibration wave is reflected at first surface 11 and attenuated continuously, so that the effect of damping and noise reduction can be achieved.
[0052] In the embodiment, the damping body 1 is a plate; in a specific implementation, the thickness of the plate is 1-5 cm. The first direction is the length direction of the plate; the second direction is perpendicular to the first direction. Specifically, the second direction is the width direction of the plate. In use, the connecting part 13 is a surface opposite to the first surface 11, which can be a surface perpendicular or parallel to the first direction.
[0053] Please refer to Figure 2 In the embodiment, the number of the first surfaces 11 is one or two; when the number of the first surfaces 11 is one, the first surface 11 and the plane on the opposite side form the acoustic black hole structure 12; that is, the number of the acoustic black hole structures is one.
[0054] When the number of the first surfaces 11 is two, the two first surfaces 11 are symmetrically arranged. When the number of the second surfaces 11 is two, each first surface can form the acoustic black hole structure 12 with the plane on the opposite side, that is, the number of the acoustic black hole structures is two. In another case, the two first surfaces 11 are oppositely arranged to form one acoustic black hole structure.
[0055] In some implementations, there can be four first surfaces 11, and two first surfaces 11 at each end form two acoustic black hole structures. At this time, the connecting part 13 is a side surface parallel to the first direction.
[0056] In some implementations, the connecting part 13 is located on at least one side surface of the damping body 1; the connecting part 13 is perpendicular and / or parallel to the first direction. Specifically, when the number of the acoustic black hole structures is one, the connecting part 13 is perpendicular and / or parallel to the first direction, and when the number of the acoustic black hole structures is two, the connecting part 13 is parallel to the first direction.
[0057] In installation, the connecting part 13 is bonded, clamped or bolted to the position to be damped. In a specific implementation, the connecting part 13 is bonded to the position to be damped. Or the clamping structure matched with the position to be damped is arranged on the connecting part 13. In some implementations, the connecting part 13 can also be bolted to the position to be damped. When bolted, a threaded hole can be arranged on the connecting part 13 of the damping body 1, or an outwardly extending structure can be arranged on the connecting part 13 to facilitate stud connection.
[0058] In the specific implementation, the vibration is transmitted to the acoustic black hole structure by fixing and installing the vibration damping body 1 at the place to be damped, so that the vibration is attenuated in the acoustic black hole structure, thereby achieving the effect of vibration damping and noise reduction. In actual application, the vibration damping body 1 is arranged in an array manner to improve the vibration damping effect. In some implementations, the vibration damping body 1 can also be arranged in different directions to achieve the purpose of damping the vibration in multiple directions.
[0059] In the specific implementation, in the acoustic black hole structure, the thickness of the acoustic black hole and the length of the acoustic black hole satisfy the following formula: Wherein, h1 is the residual thickness of the acoustic black hole, L 黑洞 is the length of the acoustic black hole, m is the power index, and H is the width of the vibration damping body.
[0060] Embodiment 2
[0061] This embodiment is a further improvement based on embodiment 1, and the same parts will not be described again. Only the different parts will be described below.
[0062] In embodiment 1, the area of the first surface 11 formed on the additional vibration damping structure is small, thereby resulting in limited vibration damping effect. In order to further improve the vibration damping effect, the following improvements are made in this embodiment.
[0063] Specifically, please refer to Figures 6 to 13 , the vibration damping body 1 is columnar, and at least one end of the vibration damping body 1 is formed with the acoustic black hole structure 12; that is, on the basis of embodiment 1, the thickness of the plate member is increased to form a columnar structure. In this way, the area of the first surface 11 can be increased, which is beneficial to improve the attenuation of the acoustic black hole structure to the vibration and improve the effect of vibration damping and noise reduction.
[0064] Please refer to Figures 6 to 12 , the acoustic black hole structure 12 gradually decreases in diameter in the direction away from the other end of the vibration damping body 1. In this way, the acoustic black hole structure 12 can have vibration attenuation in multiple directions, which is beneficial to improve the attenuation of the vibration effect in different directions.
[0065] Please refer to Figure 10 , Figure 11 and Figure 13 , in the specific implementation, the installation method of this embodiment can be fixedly installed in a hollow structure, such as a hollow columnar structure. Specifically, taking a car as an example, the vibration damping body 1 can be installed in the frame 2. Specifically, it can be installed by interference fit or by bolt connection. When installed by interference fit, the vibration damping body 1 can be subjected to low-temperature freezing to reduce its outer dimensions, and then installed in the frame 2. When located at the position to be installed, the vibration damping body 1 is restored to normal temperature.
[0066] Please refer to Figure 12 In some other implementations, the mounting of the vibration damping body 1 can be achieved by means of clamping. In specific implementation, a groove 131 or a protrusion is formed on the connecting portion 13. The mounting position is formed with a shape matching the connecting portion 13 to achieve the purpose of clamping. When the groove 131 is provided on the connecting portion 13, the corresponding mounting position is provided with a protrusion matching the groove 131.
[0067] In some other implementations, the vibration damping body 1 can also be welded with the mounting position.
[0068] In specific implementation, the number of the vibration damping body 1 is multiple. The multiple vibration damping bodies 1 are arrayed and mounted at the mounting position. In specific implementation, the mounting position can be a vibration mode node of the resonance frequency. Before mounting, the vibration mode node of the resonance frequency is determined, and then the vibration damping body 1 is mounted at the vibration mode node.
[0069] In specific implementation, the material of the vibration damping body 1 can be plastic, metal, rubber or composite material.
[0070] Embodiment 3
[0071] This embodiment is a further improvement based on embodiment 1 or embodiment 2. The same parts will not be described again, and only the different parts will be described below.
[0072] In order to further improve the damping effect, the additional damping structure disclosed in this embodiment further comprises a damping layer 3. In specific implementation, the damping layer 3 can be a coating or a structure made of a damping material. Specifically, the damping layer 3 is formed on the first surface or on the side of the vibration damping body 1 opposite to the first surface.
[0073] By providing the damping layer 3, the damping layer 3 is used to increase the damping capacity of the acoustic black hole structure to vibration, which is beneficial to further improve the damping effect.
[0074] Embodiment 4
[0075] This embodiment is a specific application of embodiment 1, embodiment 2 or embodiment 3. The same parts will not be described again, and only the different parts will be described below.
[0076] This embodiment proposes a vehicle mounting an additional damping structure, which comprises a vehicle body and the additional damping structure according to any one of embodiments 1 to 3.
[0077] The additional damping structure is fixedly installed on the vehicle body.
[0078] In a specific implementation, in order to achieve a better damping effect, the damping main body 1 is fixedly installed at a vibration mode node of the resonance frequency of the vehicle body.
[0079] The vehicle body includes a hollow member, and the damping main body 1 is fixedly installed inside or outside the hollow member.
[0080] In a specific implementation, the vibration mode node on the vehicle frame 2 can be determined through a simulation test, and then the damping main body 1 is fixedly installed at the vibration mode node.
[0081] In a specific implementation, in order to achieve a better damping effect, the connecting portion 13 should be in full contact with the vehicle frame 2 to ensure that the vibration is fully transmitted, thereby achieving a better damping effect.
[0082] It should be noted that the additional damping structure disclosed in the utility model can be applied not only to a vehicle, but also to other mechanisms or devices.
[0083] The above detailed description of the structure, features and effects of the utility model is based on the embodiments shown in the drawings, and the above description is only a preferred embodiment of the utility model, but the utility model is not limited by the drawings, and any change or modification within the scope of the utility model should be within the protection scope of the utility model.
Claims
1. An add-on vibration damping structure, characterized by: Vibration damping main body (1); Along the first direction, the size of the damping body (1) gradually increases or decreases in at least the second direction to form a first surface (11); the first surface (11) forms the acoustic black hole structure (12) of the damping body (1); The vibration damping body (1) is also provided with a connecting part (13), which is used to be fixedly installed at the position to be damped.
2. The add-on damping structure according to claim 1, characterized in that: The vibration damping body (1) is a plate; The first direction is the length direction of the plate; The second direction is perpendicular to the first direction.
3. The add-on damping structure according to claim 2, characterized in that: The number of the first surface (11) is one or two; When the number of the first surface (11) is one, the first surface (11) and the plane on the opposite side form the acoustic black hole structure (12); When there are two first surfaces (11), the two first surfaces (11) are arranged symmetrically.
4. The add-on damping structure according to claim 1, characterized in that: The connecting part (13) is located on at least one side of the vibration damping body (1); The connecting portion (13) is perpendicular to and / or parallel to the first direction.
5. The add-on damping structure according to claim 1, characterized in that: The connecting part (13) is bonded, snapped or bolted to the position where vibration reduction is to be achieved.
6. The additional vibration damping structure according to claim 1, characterized in that: The vibration damping body (1) is columnar, and at least one end of the vibration damping body (1) is formed with the acoustic black hole structure (12); The diameter of the acoustic black hole structure (12) gradually decreases along the direction away from the vibration damping body (1).
7. The additional vibration damping structure according to claim 6, characterized in that: The connecting part (13) has a groove (131) or a protrusion.
8. The additional vibration damping structure according to any one of claims 1-7, characterized in that: The number of vibration damping bodies (1) is multiple.
9. The additional vibration damping structure according to any one of claims 1-7, characterized in that: It also includes a damping layer (3) for attenuating vibrations, the damping layer (3) being formed on or inside the vibration damping body (1).
10. A vehicle equipped with an additional vibration damping structure, characterized in that: Includes the vehicle body and the additional vibration damping structure as described in any one of claims 1-8; The additional vibration damping structure is fixedly installed on the vehicle body; The vibration damping body (1) is fixedly installed at the mode node of the resonance frequency of the vehicle body; The vehicle body includes a frame (2), which is a hollow component, and the vibration damping body (1) is fixedly installed inside or outside the frame (2).