CN219277423U - Sealing structure for improving noise in electric vehicle and electric vehicle - Google Patents
Sealing structure for improving noise in electric vehicle and electric vehicle Download PDFInfo
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- CN219277423U CN219277423U CN202320198898.2U CN202320198898U CN219277423U CN 219277423 U CN219277423 U CN 219277423U CN 202320198898 U CN202320198898 U CN 202320198898U CN 219277423 U CN219277423 U CN 219277423U
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Abstract
The utility model provides a sealing structure for improving noise in an electric vehicle and the electric vehicle, and relates to the technical field of vehicle bodies, wherein the sealing structure comprises: the sealing gasket is in a grid shape, the sealing gasket is arranged between the upper cover plate of the battery pack of the electric automobile and the floor of the electric automobile, the sealing gasket is an elastic sealing gasket, and the sealing gasket is in a precompressed state, and further, the sealing gasket can mutually interfere and squeeze the upper cover plate and the floor to generate a reaction force, so that the local rigidity of the upper cover plate can be improved, the local mode of the upper cover plate is improved, the response of the upper cover plate is reduced, the noise in the automobile is improved, meanwhile, the grid-shaped sealing gasket can form interfaces with different acoustic impedances, scattered reflection can be generated when sound waves meet the interfaces with different acoustic impedances, and further, the sound waves are attenuated, and therefore, the sound insulation performance between the battery pack and the floor can be improved, and the noise in the automobile is further improved.
Description
Technical Field
The utility model belongs to the technical field of vehicle bodies, and particularly relates to a sealing structure for improving noise in an electric vehicle and the electric vehicle.
Background
Taking a certain pure electric vehicle type as an example, when the vehicle runs at a low speed and uniform speed, a road surface excites a tire, the torsional mode of the tire is excited, the tire excites a suspension through a shaft head, the suspension vibration is transmitted to an auxiliary frame, the auxiliary frame vibration is transmitted to a vehicle body, the vehicle body is connected with a battery pack and further transmitted to the battery pack, the vibration of an upper cover plate of the battery pack is excited, the vibration of the upper cover plate of the battery pack and the airtight air in the vehicle generate a strong coupling effect, and if the vehicle is excited by the low-frequency coupling mode, the vehicle can generate very high pressure pulsation in the vehicle to cause discomfort, dizziness and nausea of human ears, and the phenomenon is often called drumming or noise. The reasons for causing the noise can be examined from three aspects of source, path and response, the source is examined, and the noise change in the vehicle is verified by matching different tires; searching paths in terms of paths, finding paths with larger contributions through simulation analysis, and verifying through engineering schemes; by examining in response, testing or simulation analyzing the plate mode, the plate mode distribution is adjusted according to the phase principle based on the excitation frequency, wherein the path comprises two types of structure propagation noise and air propagation noise:
structural noise propagation is understood here to mean the transmission of dynamic forces of the tire, via the suspension, subframe, to the vehicle body, causing vibrations of the body panels or battery pack panels, which radiate noise into the vehicle;
air-borne noise is noise generated by a tire and a road surface, propagates in the air, and is transmitted into a vehicle through a vehicle body, and when an acoustic wave propagates from one medium to the other medium, at the interface between the two mediums, a part of the energy is reflected back to the original medium, and another part of the energy propagates in the other medium through the interface.
Therefore, when the vehicle is traveling on a rough road, we can feel a sound of a low frequency component, and even a sense of ear-pressing occurs, which is extremely uncomfortable. In fact, this is an acoustic phenomenon that is common to all vehicles.
Disclosure of Invention
The utility model aims to provide a sealing structure for improving noise in an electric vehicle and the electric vehicle, aiming at the defects of the prior art, so as to solve the problem that when the vehicle runs on a rough road surface, the vehicle can feel sound with low frequency components, even has a pressing ear feel, and is very uncomfortable. In fact, this is a problem of the acoustic phenomenon that is common to all vehicles.
In order to achieve the above object, the present utility model provides a sealing structure for improving noise in an electric vehicle, the sealing structure comprising:
the sealing gasket is in a grid shape, the sealing gasket is arranged between an upper cover plate of a battery pack of the electric automobile and a floor of the electric automobile, the sealing gasket is an elastic sealing gasket, and the sealing gasket is in a precompression state.
Preferably, the pre-compression of the gasket is 30% -50% of the gasket thickness.
Preferably, the thickness of the sealing gasket is 30mm, and the precompression amount of the sealing gasket is 10-15mm.
Preferably, the gasket is adhered to the upper cover plate.
Preferably, the sealing gasket comprises an outer ring and a division bar, wherein the division bar is arranged inside the outer ring and divides the inner part of the outer ring into a plurality of cavities, and the shape of the outer ring is matched with the shape of the upper cover plate.
Preferably, the cavity is polygonal.
Preferably, the sealing gasket is a Polyurethane (PU) foam tape.
Preferably, the gasket is a closed cell sponge band.
An electric vehicle comprises the sealing structure for improving noise in the electric vehicle.
Preferably, the upper cover plate is a long fiber composite plate.
The utility model provides a sealing structure for improving noise in an electric vehicle and the electric vehicle, which have the beneficial effects that:
the sealing gasket of the sealing structure is an elastic sealing gasket, is arranged between the upper cover plate of the battery pack of the electric vehicle and the floor of the electric vehicle and is in a precompressed state, and further, the sealing gasket can mutually interfere and extrude the upper cover plate and the floor to generate a reaction force, so that the local rigidity of the upper cover plate can be improved, the local mode of the upper cover plate is improved, the response of the upper cover plate is reduced, and the noise in the vehicle is improved.
The sealing gasket of the sealing structure is arranged in a grid shape, interfaces with different acoustic impedances can be formed by the grid-shaped sealing gasket, scattered reflection can be generated when sound waves meet the interfaces with different acoustic impedances, and further the sound waves are attenuated, so that the sound insulation performance between the battery pack and the floor can be improved, and the noise in the vehicle is further improved.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.
Fig. 1 is a schematic view showing a sealing structure for improving noise in an electric vehicle and a gasket structure of the electric vehicle according to an embodiment of the present utility model;
fig. 2 is a schematic view showing a sealing structure for improving noise in an electric vehicle and a structure in which a gasket for an electric vehicle is provided to an upper cover plate according to an embodiment of the present utility model;
FIG. 3 is a schematic view showing a sealing structure for improving noise in an electric vehicle and a matching structure of an upper cover plate, a gasket and a floor of the electric vehicle according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram showing a seal structure for improving noise in an electric vehicle and a pre-compression amount representation structure of a gasket of the electric vehicle according to an embodiment of the present utility model;
fig. 5 shows a second schematic diagram of a sealing structure for improving noise in an electric vehicle and a sealing gasket structure of the electric vehicle according to an embodiment of the utility model;
FIG. 6 is a schematic view showing a sealing structure for improving noise in an electric vehicle and a structure of each cavity of a gasket of the electric vehicle according to an embodiment of the present utility model;
FIG. 7 shows a second schematic diagram of a sealing structure for improving noise in an electric vehicle and a fitting structure of an upper cover plate, a gasket and a floor of the electric vehicle according to an embodiment of the utility model;
FIG. 8 is a schematic diagram showing a sealing structure for improving noise in an electric vehicle and a pre-compression amount representation structure of a sealing gasket of the electric vehicle according to an embodiment of the present utility model;
FIG. 9 shows a sealing structure for improving noise in an electric vehicle and frequency response functions before and after an upper cover plate of the electric vehicle is improved according to an embodiment of the present utility model;
FIG. 10 illustrates a seal structure for improving noise in an electric vehicle and static ATF test comparison of an upper cover plate of the electric vehicle before and after improvement according to an embodiment of the present utility model;
FIG. 11 shows a seal structure for improving noise in an electric vehicle and a 40km/h noise test comparison of a road test rough asphalt road of the electric vehicle according to one embodiment of the present utility model;
fig. 12 shows a sealing structure for improving noise in an electric vehicle and a road test rough asphalt road 100km/h noise test comparison of the electric vehicle according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a sealing gasket; 2. a cavity; 3. a battery pack; 4. and (3) a floor.
Detailed Description
Preferred embodiments of the present utility model will be described in more detail below. While the preferred embodiments of the present utility model are described below, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
The utility model provides a sealing structure for improving noise in an electric vehicle, which comprises:
the sealing gasket is in a grid shape, is arranged between the upper cover plate of the battery pack of the electric automobile and the floor of the electric automobile, is an elastic sealing gasket and is in a precompression state.
In particular, the structural noise propagation is understood here as the dynamic forces of the tire, which are transmitted to the vehicle body via the suspension, the subframe, causing the vehicle body panel or the battery pack panel to vibrate, the panel radiating the noise into the vehicle. The panel is the response portion of the squealer, which is the typical noise response at a single frequency excitation, and if the body panel modes are reasonably distributed, avoiding the excitation frequency, the noise peaks will be reduced. The modal test is often a measurement frequency response function (Frequency Response Function, FRF). The frequency response function is the ratio of the output response and the input excitation force of the structure. Simultaneously measuring the excitation force and the structural response caused by the excitation force, transforming the measured time domain data from the time domain to the frequency domain through Fast Fourier Transform (FFT), and finally presenting the frequency response function in a complex form through transformation. The maximum value of the frequency response function corresponds to the minimum value of the dynamic stiffness curve, namely, the dynamic stiffness is small at the frequency with large amplitude of the frequency response function, and the structure is easy to excite by small excitation at the frequency. And at the frequency with small frequency response function amplitude, the dynamic stiffness is large, and the structure is difficult or impossible to excite;
therefore, as shown in fig. 1-4, based on the structure to spread noise, the sealing gasket of the sealing structure is designed to be an elastic sealing gasket, is arranged between the upper cover plate of the battery pack of the electric vehicle and the floor of the electric vehicle and is in a precompressed state, and further, the sealing gasket can interfere with the upper cover plate and the floor mutually to squeeze to generate a reaction force, so that the local rigidity of the upper cover plate can be improved, the local mode of the upper cover plate is also improved, the response of the upper cover plate is reduced, and the noise in the vehicle is improved;
the airborne noise is noise generated by the tire and the road surface, propagates in the air, and is transmitted into the vehicle through the vehicle body. When an acoustic wave propagates from one medium to another, at the interface between the two mediums, a portion of the energy is reflected back to the original medium and another portion of the energy propagates through the interface within the other medium;
therefore, as shown in fig. 1-4, based on airborne noise, the sealing gasket of the sealing structure is arranged in a grid shape, the grid-shaped sealing gasket can form interfaces with different acoustic impedances, when sound waves meet the interfaces with different acoustic impedances, scattered reflection can be generated, and further the sound waves are attenuated, so that the sound insulation performance between the battery pack and the floor can be improved, and the noise in the vehicle is further improved;
preferably, the pre-compression of the gasket is 30% -50% of the gasket thickness.
Specifically, the thickness of the sealing gasket can be adjusted according to the gap between the upper cover plate and the floor, so that the sealing gasket can interfere with the upper cover plate and the floor to generate a reaction force.
Preferably, the thickness of the gasket is 30mm and the precompression of the gasket is 10-15mm.
Specifically, as shown in fig. 8, taking a conventional electric vehicle as an example, when the electric vehicle is implemented on a conventional electric vehicle, it is preferable that the thickness of the gasket be 30mm and the precompression amount of the gasket be 10-15mm.
Preferably, the gasket is adhered to the upper cover plate.
In particular, as shown in fig. 2, the bonding manner can play a role in fixing the gasket, and at the same time, the manner is easy to realize.
Preferably, the sealing gasket comprises an outer ring and a division bar, wherein the division bar is arranged inside the outer ring and divides the inner part of the outer ring into a plurality of cavities, and the shape of the outer ring is matched with the shape of the upper cover plate;
the cavity is polygonal.
Specifically, taking the existing electric vehicle as an example, when the electric vehicle is implemented on the existing electric vehicle, as shown in fig. 5-7, the inner part of the outer ring is divided into six small cavities by parting strips, wherein (1) (2) the XY plane top view of the cavity is polygonal, the length of the side a is 310mm, the length of the side b is 341m, the length of the side c is 420mm, the length of the side d is 600mm, and the length of the side e is 600mm; (3) and (4) the XY plane top view of the No. 5 and No. 6 cavities is square, and the side length is 600mm.
Preferably, the gasket is a polyurethane PU foam tape or a closed cell sponge tape.
Specifically, the density of the polyurethane PU foaming belt or the closed-pore sponge belt is 70+/-20 kg/m 3 The permanent deformation is less than or equal to 50 percent, and meets the working requirement of the sealing gasket.
An electric vehicle comprises a sealing structure for improving noise in the electric vehicle.
Specifically, experiments prove that when the electric vehicle runs on a rough asphalt pavement at a constant speed of 40km/h, the sound pressure level of the front outer ear is improved by 4.1dB (A) and the sound pressure level of the inner ear is improved by 4.3dB (A) in a frequency range of 20-70Hz, wherein in the graph 11, FLL represents the outer ear of a driver, FLR represents the inner ear of the driver, an upper line segment is in a state before improvement, and a lower line segment is in a state after improvement; as shown in fig. 12, when the electric vehicle runs on a smooth asphalt pavement at a uniform speed of 100km/h, the sound pressure level of the rear outer ear is improved by 1.6dB (A) and the sound pressure level of the inner ear is improved by 3.3dB (A) in a 400-1000Hz frequency band, wherein in fig. 11, FLL represents the outer ear of a driver, FLR represents the inner ear of the driver, an upper line segment is in a state before improvement, and a lower line segment is in a state after improvement; and further, the problems of high low-frequency noise and high medium-high frequency noise in the running process of the electric vehicle can be effectively solved.
Preferably, the upper cover plate is a long fiber composite plate.
Specifically, experiments prove that when the upper cover plate is a long-fiber composite plate, the local mode of the upper cover plate is 34Hz, and after the scheme is adopted, the local rigidity of the upper cover plate is improved, the local mode is 39Hz, so that the response of the upper cover plate is reduced, and the noise in a vehicle is improved.
Examples
As shown in fig. 1 to 8, the present utility model provides a sealing structure for improving noise in an electric vehicle, the sealing structure comprising:
the sealing gasket 1, the sealing gasket 1 is in a grid shape, the sealing gasket 1 is arranged between an upper cover plate of a battery pack 3 of the electric automobile and a floor 4 of the electric automobile, the sealing gasket 1 is an elastic sealing gasket, and the sealing gasket 1 is in a precompressed state.
In this embodiment, the pre-compression amount of the gasket 1 is 30% -50% of the thickness of the gasket 1.
In this embodiment, the thickness of the gasket 1 is 30mm, and the precompression amount of the gasket 1 is 10-15mm.
In this embodiment, the gasket 1 is adhered to the upper cover plate.
In this embodiment, the gasket 1 includes an outer ring and a division bar, the division bar is disposed inside the outer ring and divides the inner portion of the outer ring into a plurality of cavities 2, and the shape of the outer ring matches with the shape of the upper cover plate.
In this embodiment, the cavity 2 has a polygonal shape.
In this embodiment, the gasket 1 is a polyurethane PU foam tape.
In this embodiment, the gasket 1 is a closed cell sponge band.
An electric vehicle comprises a sealing structure for improving noise in the electric vehicle.
In this embodiment, the upper cover plate is a long fiber composite plate.
In summary, when the sealing structure for improving noise in an electric vehicle is implemented on the electric vehicle, the structural propagation noise can be understood as dynamic force of a tire, and the dynamic force is transmitted to a vehicle body through a suspension and an auxiliary frame, so that a panel of the vehicle body or a battery pack panel vibrates, and the panel radiates noise into the vehicle. The panel is the response portion of the squealer, which is the typical noise response at a single frequency excitation, and if the body panel modes are reasonably distributed, avoiding the excitation frequency, the noise peaks will be reduced. The modal test is often a measurement frequency response function (Frequency Response Function, FRF). The frequency response function is the ratio of the output response and the input excitation force of the structure. Simultaneously measuring the excitation force and the structural response caused by the excitation force, transforming the measured time domain data from the time domain to the frequency domain through Fast Fourier Transform (FFT), and finally presenting the frequency response function in a complex form through transformation. The maximum value of the frequency response function corresponds to the minimum value of the dynamic stiffness curve, namely, the dynamic stiffness is small at the frequency with large amplitude of the frequency response function, and the structure is easy to excite by small excitation at the frequency. And at the frequency with small frequency response function amplitude, the dynamic stiffness is large, and the structure is difficult or impossible to excite;
therefore, based on structure propagation noise, the sealing structure is designed, the sealing gasket 1 of the sealing structure is an elastic sealing gasket and is arranged between the upper cover plate of the battery pack 3 of the electric vehicle and the floor 4 of the electric vehicle and is in a precompressed state, and further, the sealing gasket 1 can interfere with the upper cover plate and the floor 4 mutually to extrude to generate a reaction force, so that the local rigidity of the upper cover plate can be improved, the local mode of the upper cover plate is also improved, the response of the upper cover plate is reduced, and the noise in the vehicle is improved;
the scheme is verified through experiments, and the frequency response function is only influenced by the structural parameters, so that the influence of the structural parameter change on the response characteristic of the system can be reflected. After the sealing gasket 1 is adopted, the frequency response function of the upper cover plate can be influenced. As shown in fig. 9, the amplitude of the improved frequency response function is obviously reduced below 100Hz, which primarily indicates that the scheme has the function of low-frequency filtering.
The airborne noise is noise generated by the tire and the road surface, propagates in the air, and is transmitted into the vehicle through the vehicle body. When an acoustic wave propagates from one medium to another, at the interface between the two mediums, a portion of the energy is reflected back to the original medium and another portion of the energy propagates through the interface within the other medium;
therefore, based on air-borne noise, the sealing gasket 1 of the sealing structure is arranged in a grid shape, the grid-shaped sealing gasket 1 can form interfaces with different acoustic impedances, when sound waves meet the interfaces with different acoustic impedances, scattered reflection can be generated, and further the sound waves are attenuated, so that the sound insulation performance between the battery pack 3 and the floor 4 can be improved, and the noise in a vehicle is further improved;
after the experiment verifies that the sealing gasket 1 is practical between the upper cover plate and the floor 4, as shown in fig. 10, in the static ATF test, the floor 4 measuring point has obvious effect, the frequency band of 400-3150Hz is improved by about 3-5dB, and the sound insulation performance is improved, wherein in fig. 10, the upper line segment is in a state before improvement, and the lower line segment is in a state after improvement.
The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. The utility model provides a seal structure who improves interior noise of electric motor car, this seal structure includes:
the sealing gasket is in a grid shape, the sealing gasket is arranged between an upper cover plate of a battery pack of the electric automobile and a floor of the electric automobile, the sealing gasket is an elastic sealing gasket, and the sealing gasket is in a precompression state.
2. The sealing structure for improving noise in an electric vehicle according to claim 1, wherein the pre-compression amount of the gasket is 30% -50% of the thickness of the gasket.
3. The sealing structure for improving noise in an electric vehicle according to claim 1, wherein the thickness of the gasket is 30mm, and the precompression amount of the gasket is 10-15mm.
4. The sealing structure for improving noise in an electric vehicle according to claim 1, wherein the gasket is adhered to the upper cover plate.
5. The sealing structure for improving noise in an electric vehicle according to claim 1, wherein the sealing gasket comprises an outer ring and a division bar, the division bar is arranged inside the outer ring and divides the inside of the outer ring into a plurality of cavities, and the shape of the outer ring is matched with the shape of the upper cover plate.
6. The sealing structure for improving noise in an electric vehicle according to claim 5, wherein the cavity has a polygonal shape.
7. The sealing structure for improving noise in an electric vehicle according to claim 1, wherein the sealing gasket is a polyurethane PU foam tape.
8. The sealing structure for improving noise in an electric vehicle according to claim 1, wherein the sealing gasket is a closed-cell sponge band.
9. An electric vehicle comprising the sealing structure for improving noise in an electric vehicle according to any one of claims 1 to 8.
10. The electric vehicle of claim 9, characterized in that the upper cover plate is a long fiber composite plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320198898.2U CN219277423U (en) | 2023-02-13 | 2023-02-13 | Sealing structure for improving noise in electric vehicle and electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320198898.2U CN219277423U (en) | 2023-02-13 | 2023-02-13 | Sealing structure for improving noise in electric vehicle and electric vehicle |
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| Publication Number | Publication Date |
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| CN219277423U true CN219277423U (en) | 2023-06-30 |
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| CN202320198898.2U Active CN219277423U (en) | 2023-02-13 | 2023-02-13 | Sealing structure for improving noise in electric vehicle and electric vehicle |
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- 2023-02-13 CN CN202320198898.2U patent/CN219277423U/en active Active
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