A vehicle body sound absorbing structure capable of improving NVH performance of a vehicle

Abstract

The application discloses a vehicle body sound absorption structure capable of improving the NVH performance of a vehicle and relates to the technical field of vehicle body sound absorption, which comprises a sound absorption structure body used for primary sound absorption, a variable resonance sound absorption mechanism used for high-efficiency vibration sound absorption of different frequencies, and a driving mechanism used for driving the variable resonance sound absorption mechanism to work under different motion states of the vehicle. In the process of use, the sound absorption structure can not only increase the sound absorption effect, but also can accelerate the resonance of internal air and sound through the variable resonance sound absorption mechanism when noise is resonated and consumed, so that the sound consumption is accelerated, the device can process more noise in a shorter time, the noise processing effect is effectively increased, and the variable resonance sound absorption mechanism can also adjust the frequency according to different driving states of the vehicle, so that the noise processing is better.

Description

Technical Field

[0001] This invention relates to the field of vehicle body sound absorption technology, and more particularly to a vehicle body sound absorption structure that can improve the NVH performance of automobiles. Background Technology

[0002] NVH is an abbreviation for Noise, Vibration, and Harshness. It is a comprehensive issue that measures the quality of automobile manufacturing. It is the most direct and superficial feeling for car users. During the driving process, due to the thinness of the car body itself, noise is generated when the car body collides with the air at high speeds. In addition, the car engine itself also produces noise during driving. Moreover, the noise will be more pronounced when driving on bumpy roads.

[0003] Chinese utility model patent CN212709264U discloses a vehicle body sound-absorbing structure that can improve the NVH performance of automobiles. The structure includes a vehicle body, several sound-insulating panels installed on the bottom surface inside the body, and several sound-absorbing columns installed on the sides inside the body. Each sound-insulating panel includes a base plate, a support plate, and a panel. The bottom of the support plate has several filler strips, and the top of the support plate has several filler blocks. Each sound-absorbing column includes a fixing plate bolted to the vehicle body, a sleeve tightly adhered to the surface of the fixing plate, and filler rods filled within the sleeve. This vehicle body sound-absorbing structure improves the NVH performance of automobiles. By using sound-insulating panels and sound-absorbing columns within the vehicle body, the sound-insulating panels can block noise transmitted from under the vehicle, while the sound-absorbing columns further absorb noise transmitted to the metal parts of the vehicle body, increasing the sound absorption performance of the vehicle body.

[0004] However, the aforementioned devices still have some problems in use. When absorbing sound from new energy vehicles, since these vehicles eliminate the engine, the main source of noise is from the outside, especially on bumpy roads where tire noise and wind noise are significant. Although adding sound-absorbing columns to the sound-absorbing cotton further improves the sound absorption effect of the sound insulation board, the sound-absorbing cotton works because it has a large number of interconnected micropores and pores. When sound waves are incident on the polyester fiber sound-absorbing cotton, they can enter the material through the pores, causing the air molecules in the pores to vibrate. Due to the viscous resistance of air and the friction between air molecules and pore walls, sound energy is converted into heat energy and lost. However, in the use of existing sound-absorbing cotton, the cotton itself cannot vibrate. Sound waves enter the interior of the material and the air inside the cotton vibrates passively, thus achieving the effect of sound absorption. When a car is driving on a bumpy road, the speed of the sound waves entering is greater than the vibration frequency, causing some sound waves to be unable to be consumed through vibration, resulting in poor sound absorption effect of the cotton. At the same time, different frequencies are generated outside the car during driving. However, in the use of existing sound-absorbing cotton, due to the fixed thickness and internal structure, it can only absorb noise of specific frequencies. The noise that cannot be absorbed will enter the interior of the car body and be perceived by people. Summary of the Invention

[0005] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The embodiments of the present invention provide a vehicle body sound-absorbing structure that can improve the NVH performance of automobiles, thereby solving the technical problems of poor sound absorption effect and small range of existing vehicle body sound-absorbing structures.

[0006] The present invention adopts the following technical solution: a car body sound-absorbing structure that can improve the NVH performance of a car, including a sound-absorbing structure for initial sound absorption, and a variable resonant sound-absorbing mechanism for efficient vibration sound absorption at different frequencies. As the car moves in different states, a drive mechanism drives the variable resonant sound-absorbing mechanism to work. The sound-absorbing structure includes a structural frame, with sound-absorbing cotton disposed at the bottom of the structural frame, a sound-guiding frame disposed on the sound-absorbing cotton, and sound-guiding cotton disposed in the sound-guiding frame.

[0007] Furthermore, the density of the sound-absorbing cotton arranged on the inner wall of the structural frame is higher than that of the sound-absorbing cotton arranged below the sound-conducting cotton.

[0008] Furthermore, the variable resonant sound-absorbing mechanism includes a fixed neck, which is disposed outside the sound-conducting frame. A variable tube neck is fitted over the fixed neck. A resonant cavity is provided at the end of the variable tube neck. Several resonant contact blocks are disposed in the fixed neck. A collar frame is disposed inside the variable tube neck. A threaded rod is spirally connected inside the collar frame. A rotating frame is disposed at the end of the threaded rod. The rotating frame is fixedly connected to the fixed neck. The threaded rod is divided into a smooth part and a threaded part. Several auxiliary contact blocks are disposed outside the smooth part. A mating contact block is disposed outside the auxiliary contact blocks.

[0009] Furthermore, the resonant contact block, auxiliary contact block, and mating contact block are made of a soft, resettable material, and the variable neck and fixed neck are coaxial.

[0010] Furthermore, the driving mechanism includes a driving component and a triggering component. The triggering component includes a touch block, which is disposed on both sides of the sound guiding frame. A third spring compression rod is disposed below the touch block. A third liquid storage box is disposed outside the third spring compression rod. A rotating block is disposed outside the third liquid storage box. The rotating block is fixedly connected to the sound-absorbing structural frame.

[0011] Furthermore, the driving component includes a second spring compression rod and a liquid storage box. The second spring compression rod is disposed on both sides of the contact block, and a second liquid storage box is disposed outside each second spring compression rod. The liquid storage box is disposed outside the sound guide frame. The second liquid storage box and the liquid storage box are connected by a connecting pipe. A first spring compression rod is disposed outside the resonant cavity, and a first liquid storage box is disposed outside the first spring compression rod. The first liquid storage box is located at both ends of the liquid storage box, and the first liquid storage box and the liquid storage box are connected by a connecting pipe.

[0012] Furthermore, the second spring compression rod is arc-shaped, and the second spring compression rod corresponds to the moving position of the contact block.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] Firstly, during use, the combination of sound-absorbing cotton and a variable resonant sound-absorbing mechanism effectively increases the sound absorption effect of the structure. The variable resonant sound-absorbing mechanism, with its variable tube diameter, fixed neck, and resonant cavity, forms a resonator. Because the tube diameter of this resonator is variable, it can resonate with sounds of different frequencies, thus achieving sound absorption for different frequencies. Furthermore, the presence of a resonant cavity effectively increases the thickness of the sound-absorbing structure. With increased thickness, the vibration of sound molecules within the structure is more effective, and the increased viscosity of the air further enhances the sound absorption. Resistance and friction between air molecules and pore walls cause sound energy to be converted into heat energy and lost, resulting in greater sound loss in the sound-absorbing structure and thus better sound absorption. Furthermore, during use, the denser sound-absorbing cotton within the inner wall of the structure creates greater flow resistance, indicating a denser material that hinders air vibration. This prevents sound from being transmitted through the side walls, ensuring that the sound entering the structure is completely processed by the sound-absorbing cotton and resonant cavity. Additionally, the variable resonant sound absorption mechanism includes resonant contacts, auxiliary contacts, and cooperating contacts. The resonant contact block, auxiliary contact block, and mating contact block are constantly moving during vehicle movement. This causes sound, not fully absorbed by the sound-absorbing cotton, to enter the fixed and variable necks. The sound then touches these contact blocks, increasing the vibration rate and thus improving the sound absorption effect. Furthermore, because each contact block is in motion, the sound is dissipated through vibration with the air. The movement of the contact blocks causes the air to vibrate continuously, further enhancing the sound absorption effect. The effect of air and sound vibration allows for rapid vibration consumption. When the resonant cavity drives the variable neck to move, it acts as a pull, quickly expelling and drawing in air from the neck and cavity. This allows the auxiliary contact block to move additionally. However, since the fixed contact block does not move while the auxiliary contact block moves, additional air vibration is caused between the auxiliary and fixed contact blocks. This further promotes the vibration of sound and air, increasing sound consumption. As a result, this sound-absorbing structure can not only absorb sound of different frequencies but also rapidly consume the absorbed sound, thus facilitating continuous sound absorption.

[0015] Secondly, during use, the drive mechanism ensures that the variable resonant sound absorption mechanism continuously operates while the car is in motion. Compared to driving on flat roads, the noise level is higher on bumpy roads. When the car encounters bumpy sections, the drive mechanism automatically intervenes, causing the variable resonant sound absorption mechanism to work. Furthermore, the operating frequency of the variable resonant sound absorption mechanism is automatically adjusted according to the amplitude and frequency of the bumps, thus better absorbing noise on bumpy roads. Although the noise level is lower while the car is in motion, noise still exists, especially during starting and braking. During these times, the drive mechanism also operates, causing the variable resonant sound absorption mechanism to work and absorb noise.

[0016] In summary, this sound-absorbing structure not only enhances sound absorption during use, but also accelerates the resonance between internal air and sound through the variable resonance sound-absorbing mechanism during noise resonance consumption, thereby speeding up sound consumption. This allows the device to process more noise in a shorter time, effectively increasing the noise reduction effect. Furthermore, the variable resonance sound-absorbing mechanism can adjust the frequency according to different driving conditions of the vehicle, thus achieving better noise reduction. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the sound-absorbing cotton structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the sound-absorbing structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the drive mechanism structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of the variable resonant sound absorption mechanism of the present invention from a first-view perspective.

[0023] Figure 6 This is a schematic diagram of the internal second-view structure of the variable resonant sound absorption mechanism of the present invention.

[0024] Figure label:

[0025] 1. Sound-absorbing structure; 11. Sound-absorbing cotton; 12. Sound-conducting cotton; 2. Variable resonant sound-absorbing mechanism; 21. Resonant cavity; 22. Variable tube neck; 23. Fixed neck; 24. Resonant contact block; 25. Auxiliary contact block; 26. Matching contact block; 27. Collar frame; 28. Threaded rod; 29. ​​Rotating frame; 3. Drive mechanism; 31. First spring compression rod; 32. First liquid storage box; 33. Connecting pipe; 34. Contact block; 35. Second spring compression rod; 36. Second liquid storage box; 37. Main liquid storage box; 38. Third spring compression rod; 39. Third liquid storage box; 310. Rotating block. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0028] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The following is combined Figures 1 to 6 As shown, this embodiment of the invention provides a vehicle body sound-absorbing structure that can improve the NVH performance of a car. It includes a sound-absorbing structure 1 for initial sound absorption, and a variable resonant sound-absorbing mechanism 2 for efficient vibration sound absorption at different frequencies. As the car moves in different states, a drive mechanism 3 drives the variable resonant sound-absorbing mechanism 2 to work. The sound-absorbing structure 1 includes a structural frame, and a sound-absorbing cotton 11 is provided at the bottom of the structural frame. A sound-guiding frame is provided on the sound-absorbing cotton 11, and a sound-guiding cotton 12 is provided in the sound-guiding frame.

[0032] During operation, this sound-absorbing structure not only enhances the sound absorption effect, but also accelerates the resonance between the internal air and sound through the variable resonance sound-absorbing mechanism 2 when noise is resonating and dissipating, thereby accelerating the sound dissipation. This allows the device to process more noise in a shorter time, effectively increasing the noise treatment effect. Furthermore, the variable resonance sound-absorbing mechanism 2 can adjust the frequency according to different driving conditions of the car, thus better handling noise.

[0033] Specifically, the density of the sound-absorbing cotton 11 arranged on the inner wall of the structural frame is higher than that of the sound-absorbing cotton 11 arranged below the sound-conducting cotton 12.

[0034] When working, avoid sound passing through the structural framework.

[0035] Specifically, the variable resonant sound absorption mechanism 2 includes a fixed neck 23, which is disposed outside the sound guide frame. A variable tube neck 22 is sleeved on the fixed neck 23. A resonant cavity 21 is disposed at the end of the variable tube neck 22. A plurality of resonant contact blocks 24 are disposed in the fixed neck 23. A collar frame 27 is disposed inside the variable tube neck 22. A threaded rod 28 is spirally connected inside the collar frame 27. A rotating frame 29 is disposed at the end of the threaded rod 28. The rotating frame 29 is fixedly connected to the fixed neck 23. The threaded rod 28 is divided into a smooth part and a threaded part. A plurality of auxiliary contact blocks 25 are disposed outside the smooth part. A mating contact block 26 is disposed outside the auxiliary contact blocks 25.

[0036] When in operation, the variable neck 22, the fixed neck 23, and the resonant cavity 21 constitute a resonator, which can quickly resonate and consume sound. Due to the design of the variable neck 22, the resonant frequency of the resonator will be in a state of change, so that the resonator can resonate with sound of different frequencies, increasing the range of applications of the resonator.

[0037] Specifically, the resonant contact 24, auxiliary contact 25 and mating contact 26 are made of soft, resettable material, and the variable neck 22 and fixed neck 23 are coaxial.

[0038] Specifically, the driving mechanism 3 includes a driving component and a triggering component. The triggering component includes a touch block 34, which is disposed on both sides of the sound guiding frame. A third spring compression rod 35 is disposed below the touch block 34. A third liquid storage box 39 is disposed outside the third spring compression rod 35. A rotating block 310 is disposed outside the third liquid storage box 39. The rotating block 310 is fixedly connected to the sound-absorbing structural frame.

[0039] Specifically, the driving component includes a second spring compression rod 35 and a liquid storage box 37. The second spring compression rod 35 is disposed on both sides of the contact block 34. A second liquid storage box 36 is disposed outside each second spring compression rod 35. The liquid storage box 37 is disposed outside the sound guide frame. The second liquid storage box 36 and the liquid storage box 37 are connected by a connecting pipe. A first spring compression rod 31 is disposed outside the resonant cavity 21. A first liquid storage box 32 is disposed outside the first spring compression rod 31. The first liquid storage box 32 is located at both ends of the liquid storage box 37. The first liquid storage box 32 and the liquid storage box 37 are connected by a connecting pipe 33.

[0040] Specifically, the second spring compression rod 35 is arc-shaped, and the second spring compression rod 35 corresponds to the moving position of the contact block.

[0041] When in operation, the contact block 34 moves due to inertia and can accurately contact the second spring compression rod 35.

[0042] Working principle: During use, the installation position of the drive mechanism 3 is adaptively modified according to the different positions of the sound-absorbing structure 1, so that the drive mechanism 3 can be affected by the bumps and inertia of the car. When the sound-absorbing structure 1 is placed at the car door, the sound-absorbing structure 1 is vertical. During the car's movement, the sound-absorbing cotton 11 is installed inside the sound-absorbing structure 1, and a variable tube neck 22, a fixed neck 23, and a resonant cavity 21 are set outside the sound guide frame, forming a resonator. The sound-absorbing cotton 11 and the resonator can absorb the noise generated during driving. When the car encounters a bumpy road, the noise generated is too large, and the sound-absorbing cotton 11 cannot completely absorb the noise. At this time, because the car is in a bumpy road, the noise generated is too large. In a bumpy state, the third spring compression rod 38 and the contact block 34, located within the sound-absorbing structure 1, will move up and down due to the bumps. When the third spring compression rod 38 moves up and down, its downward movement will compress the liquid in the third liquid storage box 39, causing the liquid in the third liquid storage box 39 to enter the main liquid storage box 37. Then, the liquid in the main liquid storage box 37 enters the first liquid storage box 32 through the connecting pipe 33, causing the first spring compression rod 31 in the first liquid storage box 32 to move. This, in turn, pushes the resonant cavity 21 to move the variable neck 22. When the position of the variable neck 22 changes, the neck length of the resonator changes. When using the resonator for resonance silencing, the resonator can only respond to specific frequencies. The resonator's ability to absorb sound is controlled by the length of the neck. When the position of the variable neck 22 changes, the overall neck length also changes. Simultaneously, when on bumpy roads, the resonator reciprocates, causing the variable neck 22 to continuously reciprocate, thus changing the resonator's absorbable frequency. This allows the resonator to absorb sound at different frequencies. Furthermore, the displacement of the variable neck 22 moves the collar frame 27, which in turn rotates the threaded rod 28. This rotation of the threaded rod 28 then displaces the auxiliary contact block 25 and the mating contact block 26 mounted on it, thereby causing the tube... The air inside the neck undergoes positional changes, accelerating the resonance efficiency between sound and air, increasing the frequency of sound absorption, and also acting as a suction and blowing mechanism to the air inside the neck during the displacement of the variable neck 22, accelerating internal airflow and facilitating air-sound resonance. Furthermore, during use, the airflow causes the auxiliary contact block 25 to vibrate, resulting in continuous misalignment between the auxiliary contact block 25 and the mating contact block 26, further increasing air fluctuations within the neck. As the amplitude and frequency of these vibrations increase, the movement frequency and amplitude of the variable neck 22 also increase, thereby enhancing the sound absorption effect. The sound absorption effect of this device varies with the frequency and amplitude of vibrations. When a car starts or brakes, the noise level will be higher.When the car starts or brakes, the contact block 34 moves back and forth due to inertia, thus squeezing the second spring compression rod 35. This causes the liquid in the second reservoir 36 to flow continuously, resulting in the movement of the variable neck 22. This accelerates the resonance between sound and air, thereby improving the sound absorption effect of the sound-absorbing structure.

[0043] In summary, this sound-absorbing structure not only enhances the sound absorption effect during use, but also accelerates the resonance between the internal air and sound through the variable resonance sound-absorbing mechanism 2 during noise resonance consumption, thereby accelerating sound consumption. This allows the device to process more noise in a shorter time, effectively increasing the noise treatment effect. Furthermore, the variable resonance sound-absorbing mechanism 2 can adjust the frequency according to different driving conditions of the vehicle, thus better handling noise.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle body sound-absorbing structure for improving NVH performance, comprising a sound-absorbing structure (1) for initial sound absorption, characterized in that; It also includes a variable resonant sound absorption mechanism (2) that can efficiently absorb sound through vibration at different frequencies, and a drive mechanism (3) that drives the variable resonant sound absorption mechanism (2) to work as the car moves in different states. The sound absorption structure (1) includes a structural frame, with sound-absorbing cotton (11) provided at the bottom of the structural frame, a sound-guiding frame provided on the sound-absorbing cotton (11), and a sound-guiding cotton (12) provided in the sound-guiding frame. The variable resonant sound absorption mechanism (2) includes a fixed neck (23), which is disposed outside the sound guide frame. A variable tube neck (22) is provided outside the fixed neck (23). A resonant cavity (21) is provided at the end of the variable tube neck (22). Several resonant contact blocks (24) are provided in the fixed neck (23). A collar frame (27) is provided inside the variable tube neck (22). A threaded rod (28) is spirally connected inside the collar frame (27). A rotating frame (29) is provided at the end of the threaded rod (28). The rotating frame (29) is fixedly connected to the fixed neck (23). The threaded rod (28) is divided into a smooth part and a threaded part. Several auxiliary contact blocks (25) are provided outside the smooth part. A mating contact block (26) is provided outside the auxiliary contact blocks (25). The driving mechanism (3) includes a driving component and a triggering component. The triggering component includes a touch block (34). The touch block (34) is disposed on both sides of the sound guide frame. A third spring compression rod (38) is disposed below the touch block (34). A third liquid storage box (39) is disposed outside the third spring compression rod (38). A rotating block (310) is disposed outside the third liquid storage box (39). The rotating block (310) is fixedly connected to the sound absorption structure frame. The driving component includes a second spring compression rod (35) and a liquid storage box (37). The second spring compression rod (35) is disposed on both sides of the contact block (34). A second liquid storage box (36) is disposed outside each second spring compression rod (35). The liquid storage box (37) is disposed outside the sound guide frame. The second liquid storage box (36) and the liquid storage box (37) are connected by a connecting pipe. A first spring compression rod (31) is disposed outside the resonant cavity (21). A first liquid storage box (32) is disposed outside the first spring compression rod (31). The first liquid storage box (32) is located at both ends of the liquid storage box (37). The first liquid storage box (32) and the liquid storage box (37) are connected by a connecting pipe (33).

2. The vehicle body sound-absorbing structure for improving NVH performance according to claim 1, characterized in that; The density of the sound-absorbing cotton (11) arranged on the inner wall of the structural frame is higher than that of the sound-absorbing cotton (11) arranged below the sound-conducting cotton (12).

3. The vehicle body sound-absorbing structure for improving NVH performance of a car according to claim 1, characterized in that; The resonant contact (24), auxiliary contact (25) and mating contact (26) are made of soft, resettable material, and the variable neck (22) and fixed neck (23) are coaxial.

4. The vehicle body sound-absorbing structure for improving NVH performance according to claim 1, characterized in that; The second spring compression rod (35) is arc-shaped and corresponds to the moving position of the contact block (34).

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