Noise insulation device, automobile noise reduction system and automobile

Abstract

The present invention provides a sound insulation device, an automobile noise reduction system, and an automobile. The sound insulation device includes a first sound insulation layer and a second sound insulation layer spaced relative to each other in the thickness direction of the sound insulation device, with multiple magnetic adjustment components disposed within the second sound insulation layer. The device also includes multiple magnetic phonon structures disposed corresponding to the multiple magnetic adjustment components. Each magnetic phonon structure is umbrella-shaped and disposed between the first and second sound insulation layers. The top of each magnetic phonon structure is fixedly connected to the first sound insulation layer, and the outer periphery of the bottom of each magnetic phonon structure abuts the second sound insulation layer. Each magnetic phonon structure forms a space with the second sound insulation layer. The size of the space between each magnetic phonon structure and the second sound insulation layer is adjustable via the magnetic adjustment components. By varying the size of the space between the magnetic phonon structure and the second sound insulation layer in the sound insulation device, this solution can cause the natural frequency of the magnetic phonon structure to change with changes in the sound field frequency, thereby attenuating noise.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile sound insulation and noise reduction, and in particular to a sound insulation device, a noise reduction system and an automobile. Background Art

[0002] When a car is driving, passengers in the passenger compartment are exposed to noise from various sources, such as powertrain noise, road noise, wind noise, intake and exhaust noise, etc. These noises significantly reduce the passengers' driving experience.

[0003] To reduce noise disturbance to passengers, existing technologies often employ large-scale acoustic packing within the vehicle interior. Traditional acoustic packing is a resistive muffler element, whose sound absorption performance is limited by the space and whose ability to suppress low-frequency noise is poor. Research has shown that low-frequency noise below 500Hz is the primary component of noise transmitted through the vehicle body structure into the passenger compartment.

[0004] To reduce low-frequency noise, existing automotive noise reduction systems employ a localized resonant phonon system within the vehicle. This resonant phonon's internal structure consists of an internal oscillator with specific frequency characteristics. Due to the coupling between the oscillator's low-frequency resonance and the elastic waves in the original structure, the elastic waves are prevented from propagating within the resonant phonon structure, creating a bandgap characteristic within a narrow frequency band. The effective frequency band is related to the inherent parameters of the structure. By adjusting the mass and spring stiffness of the internal oscillator, noise of specific frequencies passing through the resonant phonon structure can be effectively attenuated.

[0005] However, the low-frequency noise transmitted into the cabin has a large bandwidth. Furthermore, resonant phonon structures cannot effectively reduce non-stationary noise, such as that generated by the engine during acceleration. Therefore, existing automotive noise reduction systems are still not ideal for suppressing interior noise. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that the existing automobile sound insulation device has poor ability to suppress low-frequency noise and has poor ability to suppress noise generated by the automobile in unstable working conditions.

[0007] To solve the above problems, an embodiment of the present invention discloses a sound insulation device, which includes a first sound insulation layer and a second sound insulation layer arranged at an interval relative to each other in the thickness direction of the sound insulation device, and a plurality of magnetic adjustment components are arranged in the second sound insulation layer; and the sound insulation device also includes a plurality of magnetic phonon structures arranged corresponding to the plurality of magnetic adjustment components, each magnetic phonon structure is umbrella-shaped and is arranged between the first sound insulation layer and the second sound insulation layer; the top of each magnetic phonon structure is fixedly connected to the first sound insulation layer, the outer peripheral edge of the bottom of each magnetic phonon structure abuts against the second sound insulation layer, and each magnetic phonon structure forms a space with the second sound insulation layer; wherein the size of the space between each magnetic phonon structure and the second sound insulation layer is adjustable via the magnetic adjustment component.

[0008] The above solution, by placing a first and second sound insulation layer spaced relative to each other in the thickness direction of the sound insulation device, effectively absorbs noise, thereby improving the noise suppression capability of the vehicle's sound insulation device. Furthermore, multiple magnetic phononic structures are positioned between the first and second sound insulation layers. A magnetic adjustment component within the second sound insulation layer adjusts the size of the space formed by the magnetic phononic structures and the second sound insulation layer. This space can be adjusted based on the frequency of the noise, thereby altering the vibration frequency of the magnetic phononic structures, causing them to change synchronously with the frequency of the noise. This attenuates the primary noise component in the external sound field. The size of the space formed by the magnetic phononic structures and the second sound insulation layer can be adjusted based on the frequency of noise in different frequency bands and operating conditions, improving the vehicle's sound insulation device's ability to suppress various noises. Furthermore, the magnetic adjustment component adjusts the size of the space between the magnetic phononic structures and the second sound insulation layer. The magnetic field strength can be adjusted simply by adjusting the current in the magnetic adjustment component, resulting in faster and more accurate adjustment.

[0009] According to another specific embodiment of the present invention, in the sound insulation device disclosed in the embodiment of the present invention, each magnetic phonon structure includes a plurality of magnetized steel sheets; wherein, one end of each magnetized steel sheet is fixedly connected to each other and then connected to a side of the first sound insulation layer close to the second sound insulation layer; the other end of each magnetized steel sheet is in contact with a side of the second sound insulation layer close to the first sound insulation layer; each magnetized steel sheet is divergently arranged with one end of the magnetized steel sheet as the center, and there is a gap between the other ends of any two adjacent magnetized steel sheets.

[0010] By adopting the above solution, the magnetized steel sheets are arranged to have a gap between the other ends of any two adjacent magnetized steel sheets, thereby reducing the weight of the magnetized steel sheets without affecting the noise reduction effect, thereby playing a positive role in reducing the weight of the entire vehicle.

[0011] According to another specific embodiment of the present invention, in the sound insulation device disclosed in the embodiment of the present invention, each magnetic phonon structure includes four magnetized steel sheets of the same shape and size; wherein the angle between any two adjacent magnetized steel sheets is 90°; and the length of each magnetized steel sheet ranges from 10 mm to 15 mm.

[0012] According to another specific embodiment of the present invention, in the sound insulation device disclosed in the embodiment of the present invention, multiple magnetic phonon structures are periodically arranged along the length and width directions of the sound insulation device; and the sound insulation device also includes a pillar component, the two ends of the pillar component are respectively fixed to the first sound insulation layer and the second sound insulation layer, and the axial direction of the pillar component is parallel to the thickness direction of the sound insulation device; the pillar component is arranged between the magnetized steel sheets corresponding to any two adjacent magnetic phonon structures.

[0013] With this solution, the support components are provided to separate the magnetized steel sheets corresponding to two adjacent magnetic phonon structures, thereby reducing interference between the two adjacent magnetic phonon structures. When each magnetic phonon structure needs to be adjusted individually, the magnetic phonon structures will not affect each other.

[0014] According to another specific embodiment of the present invention, in the sound insulation device disclosed in the embodiment of the present invention, the magnetic force adjustment component is a solenoid; wherein the winding direction of the coil of the solenoid is parallel to the thickness direction of the second sound insulation layer; and the solenoid is arranged at a corresponding position in the space between the magnetic phonon structure and the second sound insulation layer.

[0015] By adopting the above solution, the solenoid can generate a uniform magnetic field, which can enable the magnetic force adjustment component to generate a uniform magnetic field, thereby facilitating adjustment of the size of the space between the magnetic phonon structure and the second sound insulation layer.

[0016] According to another specific embodiment of the present invention, in the sound insulation device disclosed in the embodiment of the present invention, the first sound insulation layer is a silicone membrane; the thickness of the first sound insulation layer ranges from 1.3 mm to 1.7 mm; and the second sound insulation layer is a foam sound insulation layer; the thickness of the second sound insulation layer ranges from 2.8 mm to 3.2 mm; the distance between the first sound insulation layer and the second sound insulation layer ranges from 2.8 mm to 3.2 mm.

[0017] The above solution, using a silicone membrane and foam sound insulation layer, can absorb some of the noise before it reaches the passenger compartment. Furthermore, the silicone membrane and foam sound insulation layer are lightweight, so their installation in a car can reduce noise while meeting the vehicle's lightweight requirements.

[0018] The present invention also provides a noise reduction system for an automobile, comprising a sound insulation device as described in any of the above embodiments; and an information collection device, which collects and sends sound field information inside and outside the automobile; and a control device, which is respectively communicated with the information collection device and the magnetic adjustment component to control the magnitude of the magnetic force generated by the magnetic adjustment component of the sound insulation device according to the sound field information sent by the information collection device.

[0019] By adopting the above scheme, the sound field information inside and outside the car is collected by the information collection device, and the magnitude of the magnetic force generated by the magnetic adjustment component is controlled according to the sound field information, thereby improving the accuracy of the control of the magnetic adjustment component.

[0020] According to another specific embodiment of the present invention, the noise reduction system of an automobile disclosed in the embodiment of the present invention, the control device includes a data processing component and a current control component; wherein the data processing component is respectively communicated with the current control component and the information acquisition device; the data processing component receives sound field information and performs spectral analysis on the sound field information; the current control component controls the current flowing through the magnetic adjustment component according to the analysis results of the spectral analysis.

[0021] According to another specific embodiment of the present invention, in the automobile noise reduction system disclosed in the embodiment of the present invention, the current control component controls the magnitude of the magnetic force generated by the magnetic force adjustment component to adjust the length of the contact portion between the magnetized steel sheet of each magnetic phonon structure of the sound insulation device and the second sound insulation layer of the sound insulation device, and adjust the size of the space between each magnetic phonon structure and the second sound insulation layer.

[0022] By adopting the above scheme, the vibration frequency of the sound insulation device is changed with the change of the noise frequency by adjusting the length of the contact part between the magnetized steel sheet of each magnetic phonon structure of the sound insulation device and the second sound insulation layer of the sound insulation device. Noise can be reduced by such a simple method of only changing the length of the contact part between the magnetized steel sheet and the second sound insulation layer. The structure is simple and the adjustment is convenient.

[0023] The present invention also provides an automobile, comprising the automobile noise reduction system as described in any of the above embodiments, wherein the sound insulation device of the noise reduction system is arranged on a side of the automobile body sheet metal close to and / or away from the cockpit; and the sound insulation device covers the entire body sheet metal.

[0024] By adopting the above solution, a sound insulation device is installed on the entire body sheet metal. When various noises are transmitted from the surrounding of the car into the cockpit, the sound insulation device can be used to isolate the noise from all directions, further improving the noise reduction effect of the car.

[0025] The beneficial effects of the present invention are:

[0026] The sound insulation device provided by this solution utilizes first and second sound insulation layers spaced relative to each other in the thickness direction of the sound insulation device. These layers effectively absorb noise, thereby improving the noise suppression capability of the vehicle's sound insulation device. Furthermore, multiple magnetic phononic structures are disposed between the first and second sound insulation layers. A magnetic adjustment component within the second sound insulation layer adjusts the size of the space formed between the magnetic phononic structures and the second sound insulation layer. This space can be adjusted based on the frequency of the noise, thereby altering the vibration frequency of the magnetic phononic structures, causing them to change synchronously with the frequency of the noise. This attenuates the primary noise component in the external sound field. The size of the space formed between the magnetic phononic structures and the second sound insulation layer can be adjusted based on the frequency of noise in different frequency bands and operating conditions, improving the vehicle's sound insulation device's ability to suppress various noises. Furthermore, the magnetic adjustment component adjusts the size of the space between the magnetic phononic structures and the second sound insulation layer. The magnetic field strength can be adjusted simply by adjusting the current flowing in the magnetic adjustment component, resulting in faster and more accurate adjustments. The sound insulation device provided by this solution changes the size of the space between the magnetic phononic structure and the second sound insulation layer in the sound insulation device. This allows the natural frequency of the magnetic phononic structure to change with the frequency of the sound field, thereby effectively attenuating the main noise components in the sound field.

[0027] Furthermore, the noise reduction system and automobile provided by this solution, because they have the above-mentioned sound insulation device, can effectively suppress noise in various working conditions and frequency bands, thereby improving the driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic structural diagram of a sound insulation device provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the periodic arrangement of magnetic phonon structures in the sound insulation device provided by an embodiment of the present invention;

[0030] Figure 3 1 is a schematic structural diagram of a noise reduction system for an automobile provided by an embodiment of the present invention;

[0031] Figure 4 1 is a schematic diagram of a control process of a noise reduction system for an automobile provided by an embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the local resonance mechanism of the automobile noise reduction system provided by an embodiment of the present invention;

[0033] Figure 6 is a graph illustrating the principle of the local resonance mechanism of the noise reduction system of an automobile provided by an embodiment of the present invention;

[0034] Figure 7It is a diagram of the working principle of the magnetic phonon structure of the sound insulation device provided by an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. First sound insulation layer; 2. Second sound insulation layer; 21. Magnetic force adjustment component; 3. Magnetic phonon structure; 31. Magnetized steel sheet; 4. Support component; 5. Information acquisition device; 6. Control device; 61. Data processing component; 62. Current control component; 7. Sound insulation device. DETAILED DESCRIPTION

[0037] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0040] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0041] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0042] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0043] In order to solve the problem that the existing automobile sound insulation device has poor ability to suppress low-frequency noise and poor ability to suppress noise generated by the automobile in unstable working conditions, this embodiment provides a sound insulation device. Specifically, refer to Figure 1-3 The sound insulation device provided in this embodiment includes a first sound insulation layer and a second sound insulation layer arranged with a relative spacing in the thickness direction of the sound insulation device, and a plurality of magnetic adjustment components are arranged in the second sound insulation layer; and the sound insulation device also includes a plurality of magnetic phonon structures arranged corresponding to the plurality of magnetic adjustment components, each magnetic phonon structure is umbrella-shaped and is arranged between the first sound insulation layer and the second sound insulation layer; the top of each magnetic phonon structure is fixedly connected to the first sound insulation layer, the outer peripheral edge of the bottom of each magnetic phonon structure abuts against the second sound insulation layer, and each magnetic phonon structure forms a space with the second sound insulation layer; wherein the size of the space between each magnetic phonon structure and the second sound insulation layer is adjustable via the magnetic adjustment component.

[0044] The above solution, by placing a first and second sound insulation layer spaced relative to each other in the thickness direction of the sound insulation device, effectively absorbs noise, thereby improving the noise suppression capability of the vehicle's sound insulation device. Furthermore, multiple magnetic phononic structures are positioned between the first and second sound insulation layers. A magnetic adjustment component within the second sound insulation layer adjusts the size of the space formed by the magnetic phononic structures and the second sound insulation layer. This space can be adjusted based on the frequency of the noise, thereby altering the vibration frequency of the magnetic phononic structures, causing them to change synchronously with the frequency of the noise. This attenuates the primary noise component in the external sound field. The size of the space formed by the magnetic phononic structures and the second sound insulation layer can be adjusted based on the frequency of noise in different frequency bands and operating conditions, improving the vehicle's sound insulation device's ability to suppress various noises. Furthermore, the magnetic adjustment component adjusts the size of the space between the magnetic phononic structures and the second sound insulation layer. The magnetic field strength can be adjusted simply by adjusting the current in the magnetic adjustment component, resulting in faster and more accurate adjustment.

[0045] Next, refer to Figure 1-2 The sound insulation device provided by the embodiment of the present invention is described in detail.

[0046] In this embodiment, the sound insulation device includes a first sound insulation layer 1 and a second sound insulation layer 2 that are spaced apart from each other in the thickness direction of the sound insulation device, and a plurality of magnetic force adjustment components 21 are provided in the second sound insulation layer 2 .

[0047] The thickness direction of the sound insulation device is Figure 1 The arrow in the figure shows the y direction.

[0048] Specifically, in this embodiment, the magnetic force adjustment component 21 is a solenoid. The winding direction of the solenoid coil is parallel to the thickness direction of the second sound insulation layer 2. The solenoid is arranged at a corresponding position in the space between the magnetic phononic structure 3 and the second sound insulation layer 2.

[0049] It should be noted that in this embodiment, the magnetic force adjustment component 21 is a component capable of generating magnetic fields of varying strengths. In this embodiment, multiple solenoids are disposed within the second sound insulation layer 2. Because the solenoids generate a uniform magnetic field, the magnetic force adjustment component 21 can generate a uniform magnetic field, facilitating adjustment of the space between the magnetic phononic structure 3 and the second sound insulation layer 2. In this embodiment, each solenoid comprises two to five sets of concentric coils. The induced electromotive force in the coils can be adjusted by adjusting the current flowing therein.

[0050] It should also be noted that in this embodiment, the solenoid is located within the boundary of the magnetic phononic structure 3 in a direction parallel to the thickness of the sound insulation device. This prevents the solenoid from being located too far from the magnetic phononic structure 3, which would require a large current to adjust the space between the magnetic phononic structure 3 and the second sound insulation layer 2, thereby increasing energy consumption.

[0051] Preferably, in this embodiment, the first sound insulation layer 1 is a silicone film. The thickness of the first sound insulation layer 1 ranges from 1.3 mm to 1.7 mm. Specifically, the thickness can be 1.3 mm, 1.45 mm, 1.7 mm, or other values ​​within this range. In this embodiment, the thickness of the first sound insulation layer 1 is set to 1.5 mm.

[0052] The second sound insulation layer 2 is a foam sound insulation layer, and the thickness of the second sound insulation layer 2 ranges from 2.8 mm to 3.2 mm. Specifically, it can be 2.8 mm, 3.05 mm, 3.2 mm, or other values ​​within this range. In this embodiment, the thickness of the second sound insulation layer 2 is set to 3 mm.

[0053] The distance between the first sound insulation layer 1 and the second sound insulation layer 2 ranges from 2.8 mm to 3.2 mm. Specifically, it can be 2.8 mm, 3.05 mm, 3.2 mm, or other values ​​within this range. In this embodiment, the distance between the first sound insulation layer 1 and the second sound insulation layer 2 is set to 3 mm.

[0054] In this embodiment, the silicone membrane and foam sound insulation layer absorb some of the noise before it reaches the passenger compartment. Furthermore, the silicone membrane and foam sound insulation layer are lightweight, and their installation in a vehicle can reduce noise while meeting the vehicle's lightweight requirements.

[0055] The sound insulation device also includes multiple magnetic phononic structures 3, corresponding to the multiple magnetic force adjustment components 21. Each magnetic phononic structure 3 is umbrella-shaped and is positioned between the first sound insulation layer 1 and the second sound insulation layer 2. The top of each magnetic phononic structure 3 is fixedly connected to the first sound insulation layer 1, and the outer edge of the bottom of each magnetic phononic structure 3 abuts the second sound insulation layer 2, forming a space between each magnetic phononic structure 3 and the second sound insulation layer 2.

[0056] Furthermore, the size of the space between each magnetic phononic structure 3 and the second sound insulation layer 2 is adjustable via the magnetic force adjustment component 21 .

[0057] It should be noted that the top of each magnetic phonon structure 3 is Figure 1 The bottom of each magnetic phonon structure 3 is shown in a position Figure 1 The space formed by each magnetic phonon structure 3 and the second sound insulation layer 2 is Figure 1 The space shown in S.

[0058] In this embodiment, the top of each magnetic phonon structure 3 is fixedly connected to the first sound insulation layer 1 by methods including but not limited to bonding, clamping, etc. In this embodiment, bonding is selected because the fixing method is simple and firm.

[0059] Specifically, each magnetic phononic structure 3 includes a plurality of magnetized steel sheets 31 .

[0060] It should be noted that, in order to facilitate control, the size and shape of each magnetized steel sheet 31 are the same. In this embodiment, the shape of the magnetized steel sheet 31 is as follows: Figure 2 The sheet-like structure shown is narrow at the top and wide at the bottom. Of course, those skilled in the art can also set other shapes according to actual needs.

[0061] One end of each magnetized steel sheet 31 is fixedly connected to each other and then connected to the side of the first sound insulation layer 1 close to the second sound insulation layer 2. The other end of each magnetized steel sheet 31 contacts the side of the second sound insulation layer 2 close to the first sound insulation layer 1.

[0062] The magnetized steel sheets 31 are arranged divergently with one end of the magnetized steel sheet 31 , i.e., the top of the magnetized steel sheet 31 as the center, and a gap exists between the other ends of any two adjacent magnetized steel sheets 31 , i.e., the bottoms of the magnetized steel sheets 31 .

[0063] More specifically, each magnetic phononic structure 3 includes four magnetized steel sheets 31 of identical shape and size. The angle between any two adjacent magnetized steel sheets 31 is 90°. The length of each magnetized steel sheet 31 ranges from 10 mm to 15 mm, specifically 10 mm, 12.5 mm, 15 mm, or other values ​​within this range. In this embodiment, the length of each magnetized steel sheet 31 is set to 12 mm. The length of a magnetized steel sheet 31 is the distance from the top to the bottom of the magnetized steel sheet 31.

[0064] In this embodiment, the magnetic phonon structure 3 is configured as Figure 2 The structure shown in which the top is narrower, the bottom is wider, and the bottoms of adjacent magnetized steel sheets 31 do not touch each other reduces the number of magnetized steel sheets 31 provided, thereby reducing the weight of the magnetized steel sheets 31 and playing a positive role in reducing the weight of the entire vehicle.

[0065] In this embodiment, reference Figure 2 , multiple magnetic phonon structures are periodically arranged along the length and width directions of the sound insulation device.

[0066] It should be noted that the size of the space between each magnetic phononic structure 3 and the second sound insulation layer 2 is adjustable via the magnetic force adjustment component 21. By varying the magnitude of the current flowing through the magnetic force adjustment component 21, different magnetic fields are generated around the magnetic force adjustment component 21. This magnetic field exerts varying magnetic forces on the magnetic phononic structure 3, thereby varying the length of the contact portion between the magnetized steel sheet 31 and the second sound insulation layer 2, thereby adjusting the size of the space between the magnetic phononic structure 3 and the second sound insulation layer 2.

[0067] Furthermore, in this embodiment, the size of the space between each magnetic phononic structure 3 and the second sound insulation layer 2 can be individually adjusted. In a car, different sizes of space between the magnetic phononic structure 3 and the second sound insulation layer 2 can be set for the roof, floor, trunk, and other locations, thereby improving the noise reduction effect.

[0068] Preferably, in this embodiment, the sound insulation device further includes a support member 4, the ends of which are respectively fixed to the first sound insulation layer 1 and the second sound insulation layer 2, and the axial direction of the support member 4 is parallel to the thickness direction of the sound insulation device. The support member 4 is disposed between the magnetized steel sheets 31 corresponding to any two adjacent magnetic phononic structures 3.

[0069] In this embodiment, the support component 4 is fixed to the first sound insulation layer 1 and the second sound insulation layer 2 by bonding.

[0070] The support member 4 is mainly used to separate the magnetized steel sheets 31 corresponding to two adjacent magnetic phononic structures 3 to reduce the interference between the two adjacent magnetic phononic structures 3. When each magnetic phononic structure 3 needs to be adjusted separately, the magnetic phononic structures 3 will not affect each other.

[0071] Based on the above-mentioned sound insulation device, the embodiment of the present invention further provides a noise reduction system for an automobile. The noise reduction system for an automobile provided in this embodiment, with reference to Figure 3-4 , including the sound insulation device described in the above embodiment. In addition, the automobile noise reduction system provided in this embodiment also includes an information collection device 5 and a control device 6.

[0072] The information collection device 5 collects and transmits sound field information from inside and outside the vehicle. The control device 6 is in communication with the information collection device 5 and the magnetic adjustment component, respectively, to control the magnetic force generated by the magnetic adjustment component of the sound insulation device 7 based on the sound field information transmitted by the information collection device 5.

[0073] Specifically, the control device 6 includes a data processing component 61 and a current control component 62. The data processing component 61 is in communication connection with the current control component 62 and the information acquisition device 5 respectively.

[0074] The data processing component 61 receives the sound field information and performs spectrum analysis on the sound field information; the current control component 62 controls the magnitude of the current flowing through the magnetic force adjustment component according to the analysis result of the spectrum analysis.

[0075] More specifically, the current control component 62 controls the magnitude of the magnetic force generated by the magnetic force adjustment component to adjust the length of the contact portion between the magnetized steel sheet of each magnetic phonon structure of the sound insulation device 7 and the second sound insulation layer of the sound insulation device 7, and to adjust the size of the space between each magnetic phonon structure and the second sound insulation layer.

[0076] In this embodiment, the information collection device 5 comprises a microphone inside and outside the vehicle, which can be positioned anywhere on the vehicle body as needed to collect sound signals from inside and outside the vehicle and convert these into sound field information for transmission. The control device 6 can utilize the vehicle's own onboard controller, or a separate controller can be provided, which is not limited in this embodiment. The controller can be a small electronic component with control functions, such as a single-chip microcomputer. The current control component 62 is used to adjust the current flowing through the magnetic force adjustment component, thereby adjusting the strength of the magnetic field and, therefore, the magnetic force.

[0077] Next, refer to Figure 5-7 The local resonance mechanism of the automobile noise reduction system provided in this embodiment is described. Figure 5where m and M are masses, k is the spring constant, F is the force applied to the system, F' is the spring force, x1 is the displacement of m, and x2 is the displacement of the system.

[0078] The sound insulation device in this embodiment can be simplified to a system consisting of a mass M and a mass-spring structure (m, k). When the excitation frequency is very low, the internal oscillator, i.e., the magnetic phonon structure 3, and the original system vibrate essentially synchronously. The system's dynamic equivalent mass is the sum of their static masses, i.e., Meff = M + m. At this point, their vibration characteristics are similar to those when they are rigidly connected. As the excitation frequency gradually approaches the oscillator's natural frequency, the system's dynamic equivalent mass is much greater than the sum of their static masses. Within this frequency range, the system's state is unlikely to change with external excitation, resulting in a small response, which in turn dampens the vibration and forms a band gap.

[0079] In the noise reduction system provided by the present invention, reference Figure 7 , the magnetized steel sheet 31 in the magnetic phonon structure 3 of the sound insulation device is equivalent to adding the above-mentioned system to the original structural unit. One end of the magnetized steel sheet 31 is fixed on the silicone membrane, and the other end is attracted to the foam sound insulation layer. The structure is similar to a beam structure with both ends fixed. When the magnetic field force is different, the span l of the beam after attraction also changes (becomes l'). The magnetic phonon structure 3 formed by the magnetized steel sheet 31 has certain resonance characteristics. The vibration frequency equation can be expressed as cosβlchβl=1, and the natural frequency of the beam is Where l is the distance from the fixed end (top) to the pull-in end (bottom) of the magnetized steel sheet 31, A is the equivalent cross-sectional area, and I is the equivalent moment of inertia of the cross section. When l changes, the system's natural frequency also changes, causing the resulting bandgap frequency to shift.

[0080] It should be noted that the Figure 7 In the figure, the dotted line represents the magnetic phononic structure 3 after attraction, and the solid line represents the magnetic phononic structure 3 before attraction. is the distance from the top a to the bottom b of the magnetized steel sheet 31 before attraction, and l' is the distance from the top a to the bottom b of the magnetized steel sheet 31 after attraction. The size of the space S before attraction is larger than the size of the space S after attraction.

[0081] When the control device receives noise signals from inside and outside the vehicle, it can determine the main frequency range of the external sound field noise, and ultimately control the current in the solenoid to change the attraction length of the magnetized steel sheet 31 in the magnetic phonon structure 3, so that the natural frequency of the system changes with the change of the external sound field frequency, effectively attenuating the main noise components in the external sound field.

[0082] Based on the above automobile noise reduction system, an embodiment of the present invention further provides an automobile. The automobile provided in this embodiment includes the automobile noise reduction system described in the above embodiment.

[0083] Specifically, the sound insulation device of the noise reduction system is arranged on a side of the car body sheet metal close to and or away from the cockpit.

[0084] That is to say, in this embodiment, the sound insulation device can be set on the side of the car's body sheet metal close to the cockpit, or on the side of the car's body sheet metal away from the cockpit, or on both the side of the car's body sheet metal close to the cockpit and the side away from the cockpit.

[0085] In this embodiment, in order to reduce costs and relatively effectively reduce noise, a sound insulation device is provided on the side of the automobile sheet metal close to the cockpit.

[0086] It should be noted that, in this embodiment, the first sound insulation layer 1 may be in contact with the automobile sheet metal, or the second sound insulation layer 2 may be in contact with the automobile sheet metal.

[0087] Preferably, the sound insulation covers the entire body sheet metal. In other words, to improve the noise reduction effect of the vehicle, the sound insulation can be installed on the entire body sheet metal. When various noises from the surrounding area of ​​the vehicle enter the cockpit, the sound insulation can be used to block out the noise from all directions.

[0088] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A sound insulation device, characterized in that: The sound insulation device comprises a first sound insulation layer and a second sound insulation layer which are spaced apart from each other in the thickness direction of the sound insulation device, and a plurality of magnetic force adjustment components are arranged in the second sound insulation layer; and The sound insulation device further includes a plurality of magnetic phonon structures corresponding to the plurality of magnetic force adjustment components, each of the magnetic phonon structures is umbrella-shaped and is arranged between the first sound insulation layer and the second sound insulation layer; the top of each of the magnetic phonon structures is fixedly connected to the first sound insulation layer, the outer periphery of the bottom of each of the magnetic phonon structures abuts against the second sound insulation layer, and each of the magnetic phonon structures forms a space with the second sound insulation layer; wherein, The size of the space between each magnetic phonon structure and the second sound insulation layer is adjustable via the magnetic force adjustment component; the size of the space formed by the magnetic phonon structure and the second sound insulation layer can be adjusted according to the frequency of the noise to change the vibration frequency of the magnetic phonon structure, so that the vibration frequency of the magnetic phonon structure changes synchronously with the frequency of the noise.

2. The sound insulation device according to claim 1, wherein: Each of the magnetic phononic structures includes a plurality of magnetized steel sheets; in One end of each of the magnetized steel sheets is fixedly connected to each other and then connected to a side of the first sound insulation layer close to the second sound insulation layer; the other end of each of the magnetized steel sheets is in contact with a side of the second sound insulation layer close to the first sound insulation layer; The magnetized steel sheets are divergently arranged with the one end of the magnetized steel sheet as the center, and a gap exists between the other ends of any two adjacent magnetized steel sheets.

3. The sound insulation device according to claim 2, wherein: Each of the magnetic phonon structures comprises four magnetized steel sheets of the same shape and size; The angle between any two adjacent magnetized steel sheets is 90°; and The length of each magnetized steel sheet ranges from 10 mm to 15 mm.

4. The sound insulation device according to claim 2 or 3, characterized in that: The plurality of magnetic phonon structures are periodically arranged along the length direction and the width direction of the sound insulation device; and The sound insulation device further includes a support component, both ends of which are fixed to the first sound insulation layer and the second sound insulation layer respectively, and the axial direction of the support component is parallel to the thickness direction of the sound insulation device; The support component is arranged between the magnetized steel sheets corresponding to any two adjacent magnetic phonon structures.

5. The sound insulation device according to claim 1, wherein: The magnetic force adjustment component is a solenoid; wherein The winding direction of the solenoid coil is parallel to the thickness direction of the second sound insulation layer; and The solenoid is disposed at a corresponding position in the space between the magnetic phononic structure and the second sound insulation layer.

6. The sound insulation device according to claim 1, wherein: The first sound insulation layer is a silicone film; The thickness of the first sound insulation layer ranges from 1.3 mm to 1.7 mm; and The second sound insulation layer is a foam sound insulation layer; The thickness of the second sound insulation layer ranges from 2.8 mm to 3.2 mm; The distance between the first sound insulation layer and the second sound insulation layer ranges from 2.8 mm to 3.2 mm.

7. A noise reduction system for an automobile, characterized in that: comprising the sound insulation device according to any one of claims 1 to 6; as well as An information collection device, which collects and sends sound field information inside and outside the car; A control device is respectively connected to the information acquisition device and the magnetic force adjustment component for controlling the magnitude of the magnetic force generated by the magnetic force adjustment component of the sound insulation device according to the sound field information sent by the information acquisition device.

8. The automobile noise reduction system according to claim 7, wherein: The control device includes a data processing component and a current control component; wherein The data processing component is communicatively connected with the current control component and the information acquisition device respectively; The data processing component receives the sound field information and performs spectrum analysis on the sound field information; The current control component controls the magnitude of the current flowing through the magnetic force adjustment component according to the analysis result of the spectrum analysis.

9. The automobile noise reduction system according to claim 8, wherein: The current control component controls the magnitude of the magnetic force generated by the magnetic force adjustment component to adjust the length of the contact portion between the magnetized steel sheet of each magnetic phonon structure of the sound insulation device and the second sound insulation layer of the sound insulation device, and adjust the size of the space between each magnetic phonon structure and the second sound insulation layer.

10. An automobile, characterized in that: A noise reduction system for a vehicle according to any one of claims 7 to 9, wherein The sound insulation device of the noise reduction system is arranged on a side of the body sheet metal of the automobile close to and / or away from the cockpit; and The sound insulation device covers the entire body sheet metal.

Images