Local resonance sealing structure, arrangement method and automobile

Abstract

The invention discloses a local resonance sealing structure, an arrangement method and an automobile, and relates to the technical field of automobile sealing. The structure comprises a bubble tube part and a connecting part, the bubble tube part is of a tubular structure, the bubble tube part comprises a plurality of local resonance units arranged in the length direction, each local resonance unit comprises a base body frame, an inner core body and a connecting arm, the base body frame is the tube wall of the bubble tube part, a resonant cavity is formed in the base body frame, and the inner core body is arranged in the resonant cavity. The inner core body is contained in the center of the resonant cavity, and the inner core body is elastically connected with the base body frame through a connecting arm; and the connecting part is fixedly connected to the outer side wall of the bubble tube part. The method comprises the steps of determining parameters of a matrix frame according to the type of the sealing structure; and determining the structural forms of the inner core body and the connecting arms according to the structural form of the base body frame. Vibration isolation can be realized in a broadband range, so that the vibration isolation effect is remarkably improved, and vibration and noise in a vehicle are reduced; the problems that in the prior art, the application range is narrow, and the vibration isolation frequency range is small are solved.

Description

Technical Field

[0001] This invention relates to the field of automotive sealing technology, and more particularly to a localized resonant sealing structure, arrangement method, and automobile. Background Technology

[0002] The noise, vibration, and harshness (NVH) characteristics of automobiles are directly related to their competitiveness and sales, and have therefore gradually gained attention from automakers, becoming an important factor in measuring the quality of automobile design and manufacturing.

[0003] The main function of automotive weatherstripping is to isolate the interior and exterior spaces of the vehicle, preventing external noise, dust, rainwater, and other pollutants from entering the cabin. Weatherstripping also acts as a vibration damper; vibrations from the vehicle structure are attenuated and isolated by the weatherstripping before being transmitted to the doors. Good vibration damping performance of weatherstripping can significantly reduce door vibrations, thereby reducing vibration and noise inside the vehicle.

[0004] The sealing effect of a weatherstripping can be achieved by selecting a rubber material with appropriate hardness, designing a simple hollow cross-section, and ensuring the thickness of the rubber layer. However, this type of weatherstripping has weak vibration isolation performance, and vehicle vibrations can be transmitted to the door through the weatherstripping, causing the door to vibrate significantly and resulting in noticeable interior noise.

[0005] CN219467513U discloses a door frame sealing structure and an automobile. The door frame sealing structure includes a U-shaped opening with a first sidewall and a second sidewall spaced apart from each other, the distance between the first and second sidewalls being 9-10 mm. The first sidewall has multiple first lips spaced apart in the depth direction of the U-shaped opening, and the second sidewall has multiple second lips spaced apart in the depth direction of the U-shaped opening. The multiple second lips correspond one-to-one with the multiple first lips for securing and sealing sheet metal stops. The first sidewall also has an elastic sealing edge near the open end of the U-shaped opening, which flips up towards the closed end of the U-shaped opening. However, this prior art lacks an acoustic noise reduction structure, resulting in poor sound insulation and vibration damping capabilities and effects.

[0006] CN119590187A relates to a sealing strip and an automobile, wherein the sealing strip includes: a sealing part and an acoustic metamaterial structure; the sealing part forms a receiving cavity; the acoustic metamaterial structure is disposed within the receiving cavity; the acoustic metamaterial structure includes a cavity structure and an acoustic metamaterial unit disposed on one side of the cavity structure; wherein the cavity structure has a resonant cavity, the resonant cavity having a first opening near the acoustic metamaterial unit; the acoustic metamaterial unit includes a thin film and a mass block, the thin film sealing the first opening of the resonant cavity, and the mass block being disposed on the side of the thin film away from the resonant cavity. However, this prior art uses a thin film structure, which is susceptible to temperature influences, has high processing difficulty and cost, is difficult to apply at corners or in narrow spaces, and has a relatively small vibration isolation frequency range. Summary of the Invention

[0007] The purpose of this invention is to provide a local resonance sealing structure, arrangement method, and automobile. Based on the principle of local resonance and making full use of the structural feature that the longitudinal dimension of the sealing structure is much larger than the cross-sectional dimension, vibration isolation can be achieved in a wide frequency range, thereby significantly improving the vibration isolation effect and reducing vibration and in-vehicle noise; it solves the problems of narrow application range and small vibration isolation frequency range of the prior art.

[0008] This invention provides the following solutions

[0009] A localized resonant sealing structure includes a bubble tube section and a connecting section. The bubble tube section is a tubular structure and includes a plurality of localized resonant units arranged along its length. Each localized resonant unit includes a base frame, an inner core, and a connecting arm. The base frame is the tube wall of the bubble tube section, and a resonant cavity is provided inside the base frame. The inner core is housed in the center of the resonant cavity, and the inner core and the base frame are suspended and elastically connected by the connecting arm. The connecting section is fixedly connected to the outer wall of the bubble tube section.

[0010] Furthermore, the inner core is a regular block geometric structure, which facilitates processing and calculation. At least three connecting arms are fixedly connected between the inner core and the inner wall of the base frame, because fewer than three connecting arms lack stability. The connecting arms are evenly arranged along the circumference of the cross-section of the inner core, and the arrangement angle of each connecting arm is the same, so that the vibration isolation frequency from all directions is the same or close. The connecting arms are made of elastic material to provide elasticity.

[0011] Furthermore, the local resonant sealing structure includes at least two segments arranged along the length direction, and the local resonant units arranged in two adjacent segments have different bandgap frequencies; so that different segments isolate vibrations for vibrations of different frequencies.

[0012] Furthermore, the local resonant sealing structure includes at least two segments arranged along the length direction, wherein at least one segment contains at least two local resonant units with different bandgap frequencies, and each segment includes local resonant units with bandgap frequencies different from those of adjacent segments; this allows different segments to isolate vibrations at different frequencies while broadening the isolation frequency of certain segments as needed.

[0013] Furthermore, the cross-section of the base frame is ear-shaped, and this shape is set according to the location of the sealing structure and the sealing requirements; the inner core is a spherical structure, and four connecting arms connect the inner core and the base frame. Each connecting arm is a cylindrical structure, and the two ends of the connecting arm are fixedly connected to the outer surface of the inner core and the inner wall of the base frame, respectively; the spherical structure and the cylindrical structure are easy to process, and the spherical inner core is suitable for higher vibration isolation frequencies.

[0014] Furthermore, the local resonance sealing structure is a door sealing strip, and each part of the door sealing strip is made of rubber material with a material density of 650 kg / m3, a Poisson's ratio of 0.4, and an equivalent elastic modulus of 2.3 MPa under compression. Multiple identical local resonance units are arranged at equal intervals within the door sealing strip, with a spacing a = 80 mm. The thickness of the base frame of the local resonance structure is h = 1.6 mm, and the diameter d of the inner core ranges from 1 mm to 5 mm. The diameter of the connecting arm is b = 0.5 mm, and the arrangement angle θ of the connecting arm ranges from 0° to 45°. The combination of these parameters of the local resonance sealing structure is used to reduce the vibration of the door in the 110-240 Hz frequency range.

[0015] Furthermore, the cross-section of the base frame is ear-shaped, and the inner core is a regular polygonal prism structure. The regular polygonal prism structure is also easy to process and calculate, and is mainly for vibrations of medium or low frequency. Multiple connecting arms connect the inner core and the base frame. The number of connecting arms is the same as the number of sides of the inner core. Each connecting arm is a cylindrical structure. The two ends of the connecting arm are fixedly connected to the outer surface of the inner core and the inner wall of the base frame, respectively. The multiple connecting arms are fixedly connected to the centers of multiple sides of the inner core at equal angles. The number of connecting arms and the number of sides of the inner core are obtained through calculation and analysis, and are used to isolate vibrations in a certain frequency band.

[0016] Furthermore, the cross-section of the base frame is ear-shaped, and the inner core is a cylindrical structure. Four connecting arms connect the inner core and the base frame. Each connecting arm is a wedge-shaped structure. The width of the end of the connecting arm that is fixedly connected to the cylindrical surface of the inner core is smaller than the width of the end that is fixedly connected to the inner wall of the base frame. The connecting arms are evenly arranged along the circumference of the cross-section of the inner core, and the arrangement angle of each connecting arm is the same. The shape of the connecting arms affects the stiffness distribution and also affects the resonant frequency. The stiffness of the wedge-shaped connecting arms is gradually changing, and the resonant frequency can be finely adjusted without changing the overall length.

[0017] A method for arranging a localized resonant sealing structure, based on the aforementioned localized resonant sealing structure, includes the following steps:

[0018] The parameters of the base frame are determined according to the type of sealing structure;

[0019] The structural forms of the inner core and connecting arms are determined based on the structural form of the base frame.

[0020] The sealing structure is divided into sections based on its location, and the vibration isolation frequency of each section of the sealing structure is determined.

[0021] Analyze and determine the structural parameters of the inner core and connecting arms, and select appropriate materials;

[0022] Analyze and determine the distribution of local resonant units in each segment of the sealed structure;

[0023] Based on the analysis results, a local resonance sealing structure was fabricated and installed on the corresponding part of the vehicle body.

[0024] An automobile includes the aforementioned localized resonance sealing structure, possessing all the advantages of the aforementioned localized resonance sealing structure.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] The local resonance sealing structure, arrangement method, and automobile provided by this invention adopt the principle of local resonance and make full use of the structural feature that the longitudinal dimension of the sealing structure is much larger than the cross-sectional dimension. By arranging several local resonance units along the longitudinal direction of the sealing structure, based on the principle of local resonance and the variation of the size of the resonance units, it is ensured that the parameters of different local resonance structures are different, which can achieve vibration isolation in a wide frequency range, thereby significantly improving the vibration isolation effect of the sealing strip and reducing vibration and in-vehicle noise. Attached Figure Description

[0027] 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.

[0028] Appendix Figure 1 This is a schematic diagram of the local resonance sealing structure described in this invention;

[0029] Appendix Figure 2 This is a longitudinal cross-sectional schematic diagram of the localized resonant sealing structure described in this invention;

[0030] Appendix Figure 3 This is a schematic diagram of some parameters of the local resonance unit described in this invention;

[0031] Appendix Figure 4 This is a schematic diagram showing the spacing of the local resonant units described in this invention;

[0032] Appendix Figure 5 This is a schematic diagram of the local resonance sealing structure described in Embodiment 4 of the present invention;

[0033] Appendix Figure 6 This is a cross-sectional schematic diagram of the local resonance sealing structure with an annular inner core as described in Embodiment 2 of the present invention;

[0034] Appendix Figure 7This is a cross-sectional schematic diagram of the local resonance sealing structure with an inner core of a regular triangular prism as described in Embodiment 2 of the present invention;

[0035] Appendix Figure 8 This is a cross-sectional schematic diagram of the local resonance sealing structure with an inner core of a regular square prism as described in Embodiment 2 of the present invention;

[0036] Appendix Figure 9 This is a cross-sectional schematic diagram of the local resonance sealing structure with a regular hexagonal prism inner core as described in Embodiment 2 of the present invention;

[0037] Appendix Figure 10 This is a cross-sectional schematic diagram of the local resonant sealing structure of the inner core comprising three small spheres as described in Embodiment 2 of the present invention;

[0038] Appendix Figure 11 This is a schematic diagram of the local resonance sealing structure described in Embodiment 3 of the present invention;

[0039] Appendix Figure 12 A schematic diagram comparing the vibration of a car door using a traditional sealing strip with the localized resonance sealing structure described in this invention;

[0040] Appendix Figure 13 This is a schematic diagram comparing in-vehicle noise levels using a traditional sealing strip with the localized resonance sealing structure described in this invention.

[0041] Appendix Figure 14 This is a schematic diagram illustrating the principle of a localized resonance structure.

[0042] Appendix Figure 15 This is a schematic diagram of the local resonance sealing structure arrangement method described in this invention.

[0043] In the picture:

[0044] 1. Bubble tube section; 100. Local resonance unit; 101. Matrix frame; 102. Inner core; 103. Connecting arm; 104. Small ball; 105. Internal connecting arm; 2. Connecting part; 210. Snap-fit ​​part; 211. Snap-fit ​​groove; 212. Pressing edge; 213. First lip; 214. Second lip; 215. Inverted U-shaped skeleton; 220. Sealing tube wall. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0047] It should be understood that the term "and / or" used in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0048] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0049] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0050] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0051] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0052] Locally resonant structures are artificial structures designed based on the principle of local resonance. By introducing resonant units at the subwavelength scale, they can achieve directional control of sound waves or elastic waves in specific frequency bands.

[0053] When sound waves or elastic waves propagate in a localized resonant structure, they are affected by the internal structure. Some frequency ranges of elastic waves cannot propagate forward through the structure; this frequency range is called the band gap. Elastic waves of other frequency units can propagate forward smoothly through the structure; these frequency segments are called the passband.

[0054] Please see Figure 14 As shown, the unit cell structure of a typical two-dimensional localized resonant phonon crystal generally consists of three components: a matrix, a cladding layer, and a core. Please refer to [link to relevant documentation]. Figure 14 As shown in (a). This three-component localized resonant unit 100 structure can be configured as follows: Figure 14 The model shown in (b) is simplified to an equivalent form.

[0055] The core of a localized resonance structure lies in the local resonance effect of a "mass-spring" system. In the diagram below, the core is generally made of a dense, hard material, providing mass (denoted as m); the cladding is made of a softer material, providing elasticity (denoted as k); and the matrix is ​​generally made of a harder material, enclosing the mk oscillator composed of the core and cladding, which is the direct receiver of vibration (denoted as M).

[0056] The bandgap frequency of a localized resonant structure refers to the frequency range within an acoustic metamaterial where sound wave propagation is prohibited by embedding artificially designed resonant units (such as mass-spring systems, Helmholtz resonators, membrane structures, etc.) and utilizing their localized resonant characteristics. The core mechanism of this bandgap is the strong coupling between the resonant unit and the incident sound wave, which blocks sound wave propagation through energy absorption, reflection, or destructive interference. Compared to the Bragg scattering bandgap, it possesses unique frequency characteristics and design flexibility.

[0057] The specific working principle of a localized resonant structure: Assume the excitation force on the matrix and the reaction force on the oscillator are F and F', respectively, and the displacements of the matrix and the oscillator are X and x, respectively. According to Newton's second law and Hooke's law, we have:

[0058]

[0059]

[0060]

[0061] Treating the matrix and internal oscillator as a whole, the dynamic equivalent mass and displacement frequency response function of the entire system can be obtained as follows:

[0062]

[0063]

[0064] In the formula: ω represents the angular frequency; is the natural frequency of the internal oscillator.

[0065] The dynamic equivalent mass and displacement frequency response function change with frequency. As the external excitation frequency changes, the system exhibits different dynamic equivalent masses and thus different vibration characteristics.

[0066] ① When the excitation frequency is very low, the vibration of the internal resonant units can basically remain synchronized with the matrix, and the dynamic equivalent mass of the system is the sum of their static masses, i.e. At this point, their vibration characteristics are similar to those when they are rigidly connected together.

[0067] ② When the excitation frequency gradually approaches the natural frequency of the resonant element (i.e., When the system's dynamic equivalent mass is much greater than the sum of its static masses, the system's state is difficult to change with external excitation within this frequency range, resulting in a smaller response and thus vibration attenuation and the formation of a band gap. This is because, within this frequency range, the internal resonant elements vibrate in the opposite direction to the matrix, weakening the matrix's vibration.

[0068] ③When (i.e., when local resonance occurs) The system does not respond to external stimuli. This is because the vibration of the matrix is ​​completely canceled out by the reaction force of the internal local resonance, so it remains essentially still.

[0069] ④ When the frequency ω is in [ In the [range], the dynamic equivalent mass of the system gradually decreases from negative infinity to zero, and its vibration characteristics differ from those of conventional materials, thus it is called an extraordinary acoustic material. Elastic waves are reflected or confined within internal resonant units in this range and cannot propagate further. Therefore, this range corresponds to the frequency range of the acoustic bandgap.

[0070] The system's dynamic equivalent mass and vibration characteristics are shown in the table below:

[0071] Table 1

[0072]

[0073] As the above analysis shows, the band gap is caused by the resonance of the internal oscillator, and its upper and lower frequency limits are determined by the natural frequencies of the internal oscillator and the entire structure. Therefore, the frequency range in which the band gap appears can be adjusted by changing the mass and spring of the equivalent simplified model of the unit structure.

[0074] Example 1, please refer to Figure 1 and Figure 2As shown, this embodiment provides a local resonance sealing structure, including a bubble tube section 1 and a connecting section 2. The bubble tube section 1 is a tubular structure, and the bubble tube section 1 includes a plurality of local resonance units 100 arranged along the length direction. Each local resonance unit 100 includes a base frame 101, an inner core 102 and a connecting arm 103. The base frame 101 is the tube wall of the bubble tube section 1, and a resonance cavity is provided inside the base frame 101. The inner core 102 is housed in the center of the resonance cavity, and the inner core 102 is elastically connected to the base frame 101 through the connecting arm 103. The connecting section 2 is fixedly connected to the outer wall of the bubble tube section 1 for connecting with corresponding parts of the vehicle body.

[0075] Based on the principle of local resonance, the base frame 101 is equivalent to the base of the aforementioned local resonance unit 100 structure, the inner core 102 is equivalent to the core of the aforementioned unit structure, providing mass, and the connecting arm 103 is equivalent to the covering layer, providing elasticity; the inner core 102 and the connecting arm 103 form the mk oscillator; the base frame 101 surrounds the oscillator and is the direct receiver of vibration.

[0076] Specifically, the cross-section of the base frame 101 is ear-shaped, the inner core 102 is a spherical structure, and four connecting arms 103 are connected between the inner core 102 and the base frame 101. Each connecting arm 103 is a cylindrical structure, and the two ends of the connecting arm 103 are fixedly connected to the outer surface of the inner core 102 and the inner wall of the base frame 101, respectively. The connecting arms 103 are evenly arranged along the circumference of the cross-section of the inner core 102, and the arrangement angle of each connecting arm 103 is the same.

[0077] Please see Figure 4 As shown, multiple local resonant units 100 are arranged at equal intervals along the length of the tubular cavity inside the bubble tube section 1, and the spacing a is the center distance of the inner core 102 of two adjacent local resonant units 100.

[0078] For a sealed structure containing local resonant units, the frequency of the bandgap is related to the structural form, structural parameters, and material parameters of the local resonant units.

[0079] Please see Figure 3 and Figure 4As shown, in this embodiment, the tube wall of the bubble tube 1 serves as the base frame 101, which ensures sealing performance. The main structural parameter of the frame is its thickness h. The inner core 102 acts as an equivalent mass in the local resonance structure. Its structural form is a sphere, and its main structural parameter is its diameter d. The connecting arm 103 connects the base frame 101 and the inner core 102, and acts as an equivalent stiffness in the local resonance structure. Its structural form is a cylinder, and its main structural parameters include the number n, the cross-sectional diameter b, and the arrangement angle θ. The arrangement angle θ is the acute angle between the line connecting the connection point of the connecting arm 103 and the inner core 102 and the center of the inner core 102, relative to the longitudinal direction of the connecting arm 103. The spacing a of the local resonance units 100 affects the vibration isolation and sound insulation effect.

[0080] Regarding materials, for ease of processing, the inner core 102 and connecting arm 103 can both be made of rubber, as can the base frame 101. Alternatively, different materials can be selected, provided that the overall sealing performance of the sealing structure is not affected and the compression reaction force of the sealing structure is within a reasonable range. For example, the inner core 102 can be made of steel, copper, stone, magnet, plexiglass, or composite materials. For base frame 101 with large compression, a denser metal material can be used to reduce the core's footprint. The inner core 102 can also be made of metal to improve its mass, and then covered with a layer of highly elastic rubber material. The rubber material is vulcanized with the connecting arm 103 and then vulcanized with the outer sealing strip bubble wall. The connecting arm 103 can be made of highly elastic materials such as silicone rubber. The main material parameters include material density, Poisson's ratio, and elastic modulus.

[0081] In some embodiments, the sealing structure is a door sealing strip, and each part of the sealing strip is made of rubber material with a density of 650 kg / m3, a Poisson's ratio of 0.4, and an equivalent elastic modulus of 2.3 MPa under compression.

[0082] The local resonance unit 100 of the above-mentioned sealing strip has a base frame 101 thickness h=1.6mm and a local resonance unit spacing a=80mm; the inner core 102 adopts a spherical structure, and the sphere diameter d ranges from 1mm to 5mm, with 3mm in this embodiment; the connecting arm 103 is a cylindrical structure, with a quantity n=4, a diameter b=0.5mm, and an arrangement angle θ ranging from 0° to 45°, with 45° in this embodiment.

[0083] When the sealing strip with the local resonance unit 100 is installed on the car door, the sound wave is transmitted from outside the car to the door structure and causes the structure to vibrate. After the car door comes into contact with the sealing strip and is compressed, the sound wave with a frequency near the natural frequency of the internal oscillator will excite the local resonance of the internal oscillator of the sealing strip, resulting in the generation of an acoustic band gap, thereby hindering the sound wave from being transmitted to the cabin through the door system.

[0084] Please see Figure 12 and Figure 13 As shown, comparing the in-vehicle noise and door vibration using traditional sealing strips and the sealing strip described in this embodiment, it can be seen that using the sealing strip described in this embodiment can significantly reduce the vibration of the door in the 110-240Hz frequency range, thereby reducing the noise of the entire vehicle at the corresponding frequency.

[0085] For local resonant sealing strip structures, if the structural parameters of all local resonant structures of the sealing strip are consistent, vibration attenuation can only be achieved near a certain frequency. In order to achieve vibration isolation over a wide frequency range, the sealing strip can be divided into several segments, and the structural parameters of each local resonant structure in each segment vary within a certain range.

[0086] In some embodiments, the entire sealing strip can be divided into four segments: the upper window frame segment, the A-pillar and front hinge segment, the B-pillar and door lock segment, and the lower sill segment; please refer to [link / reference]. Figure 2 As shown, the distribution of each local resonant unit 100 on the entire sealing strip can be changed. For example, the distribution of local resonant structural units on each segment of the sealing strip can be either equidistant or non-equidistant.

[0087] In addition to door sealing strips, localized resonance sealing structures can also be used in various sealing strips with bubble tube shapes, such as door opening sealing strips, glass guide channels, rear door sealing strips, and sunroof sealing strips.

[0088] Example 2: This example provides a local resonance sealing structure, including local resonance units 100 with different structural forms.

[0089] Specifically, please refer to Figure 6 As shown, the cross-section of the base frame 101 is ear-shaped, the inner core 102 is a ring structure, and four connecting arms 103 are connected between the inner core 102 and the base frame 101. Each connecting arm 103 is a cylindrical structure, and the two ends of the connecting arm 103 are fixedly connected to the outer surface of the inner core 102 and the inner wall of the base frame 101, respectively. The connecting arms 103 are evenly arranged along the circumference of the cross-section of the inner core 102, and the arrangement angle of each connecting arm 103 is the same.

[0090] Please see Figure 7 As shown, the cross-section of the base frame 101 is ear-shaped, and the inner core 102 is a regular triangular prism structure. Three connecting arms 103 connect the inner core 102 and the base frame 101. Each connecting arm 103 is a cylindrical structure. The two ends of the connecting arm 103 are fixedly connected to the outer surface of the inner core 102 and the inner wall of the base frame 101, respectively. The three connecting arms 103 are fixedly connected to the centers of the three sides of the inner core 102 at equal angles.

[0091] Please see Figure 8As shown, the cross-section of the base frame 101 is ear-shaped, and the inner core 102 is a regular square prism structure. There are four connecting arms 103 connecting the inner core 102 and the base frame 101. Each connecting arm 103 is a cylindrical structure. The two ends of the connecting arm 103 are fixedly connected to the outer surface of the inner core 102 and the inner wall of the base frame 101, respectively. The four connecting arms 103 are fixedly connected to the centers of the four sides of the inner core 102 at equal angles.

[0092] Please see Figure 9 As shown, the cross-section of the base frame 101 is ear-shaped, and the inner core 102 is a regular hexagonal prism structure. There are 6 connecting arms 103 connecting the inner core 102 and the base frame 101. Each connecting arm 103 is a cylindrical structure. The two ends of the connecting arm 103 are fixedly connected to the outer surface of the inner core 102 and the inner wall of the base frame 101, respectively. The 6 connecting arms 103 are fixedly connected to the centers of the six sides of the inner core 102 at equal angles.

[0093] Please see Figure 10 As shown, the cross-section of the base frame 101 is ear-shaped. The inner core 102 includes three identical small balls 104, which are arranged in an equilateral triangle along the cross-section of the base frame 101. The three small balls 104 are fixedly connected in pairs by internal connecting arms 105. The internal connecting arms 105 are cylindrical structures and can be made of materials with high elasticity, such as silicone rubber. Three connecting arms 103 connect the inner core 102 to the base frame 101. Each connecting arm 103 is a cylindrical structure, and its two ends are fixedly connected to the outer surface of the inner core 102 and the inner wall of the base frame 101, respectively. The three connecting arms 103 are fixedly connected to the outermost surfaces of the three small balls 104 of the inner core 102 at equal angles. This structure uses multiple oscillators to broaden the operating frequency band and make the vibration isolation frequency range larger.

[0094] The inner core 102 can also be a cylinder, a regular polyprism, a regular polyhedron, a cone, or other regular structural forms. The structural form of the inner core 102 will affect the level and range of the bandgap frequency. For example, a sphere has a smaller moment of inertia and a higher resonant frequency than a cylinder or prism, and therefore a higher bandgap frequency. The number and connection position of the connecting arms 103 can be arranged according to the shape of the inner core 102, but they are all uniformly set at equal angles along the circumference of the cross-section of the inner core 102.

[0095] Example 3: This example provides a local resonance sealing structure, including local resonance units 100 with different structural forms.

[0096] Specifically, the connecting arm 103 can also adopt different structural forms, such as prism structure, cylindrical structure, etc., with a constant cross-section along the length direction, or a variable cross-section structure, such as the wedge structure provided in this embodiment.

[0097] Please see Figure 11 As shown, the cross-section of the base frame 101 is ear-shaped, and the inner core 102 is a cylindrical structure. Four connecting arms 103 connect the inner core 102 and the base frame 101. Each connecting arm 103 is a wedge-shaped structure. The narrower end of the connecting arm 103 is fixedly connected to the cylindrical surface of the inner core 102, and the wider end of the connecting arm 103 is fixedly connected to the inner wall of the base frame 101. The included angle of the two side walls of the four connecting arms 103 and the width of the narrower end are the same. The connecting arms 103 are evenly arranged around the circumference of the cross-section of the inner core 102, and the arrangement angle of each connecting arm 103 is the same. The arrangement angle θ is the acute angle between the line connecting the connection point of the connecting arm 103 and the inner core 102 and the center of the inner core 102 and the midline of the included angle of the side of the connecting arm 103.

[0098] The connecting arm 103 can be made of rubber or other materials with a certain degree of elasticity.

[0099] Example 4, please refer to Figure 5 As shown, this embodiment provides a localized resonance sealing structure, specifically a car door sealing strip, including the aforementioned bubble tube portion 1 and localized resonance unit 100, and also includes a snap-fit ​​portion 210. The snap-fit ​​portion 210 is connected to the bubble tube portion 1 through sealing tube walls 220 on the upper and lower sides. The snap-fit ​​portion 210 includes an inverted U-shaped snap-fit ​​groove 211. The top wall of the snap-fit ​​groove 211 extends downward to the left with a pressing edge 212. The left inner side wall of the snap-fit ​​groove 211 extends obliquely upward with a first lip 213 and a second lip 214. Edge 213 is located below the second lip edge 214, and the extension length of the first lip edge 213 is greater than that of the second lip edge 214; several second lips 214 are extended on the right inner side wall of the snap-fit ​​groove 211 relative to the left inner side wall, and the first lip edge 213 and the second lip edge 214 are used to snap onto the car door sheet metal; an inverted U-shaped skeleton 215 is embedded in the groove wall of the snap-fit ​​groove 211 to provide snap-fit ​​strength; the right side wall of the snap-fit ​​groove 211, the left side wall of the bubble tube part 1, and the sealing tube walls 220 on the upper and lower sides also constitute a tubular cavity.

[0100] The local resonance unit 100 can be arranged not only on a single-bubble type sealing strip, but also on a double-bubble type sealing strip.

[0101] Example 5, please refer to Figure 15 As shown, this embodiment provides a method for arranging a localized resonant sealing structure, including the following steps:

[0102] The parameters of the base frame 101 are determined according to the type of sealing structure;

[0103] The structural forms of the inner core 102 and the connecting arm 103 are determined according to the structural form of the base frame 101.

[0104] The sealing structure is divided into sections based on its location, and the vibration isolation frequency of each section of the sealing structure is determined.

[0105] Analyze and determine the structural parameters of the inner core 102 and the connecting arm 103, and select appropriate materials;

[0106] Analyze and determine the distribution of local resonant units 100 in each segment of the sealed structure;

[0107] Based on the analysis results, a local resonance sealing structure was fabricated and installed on the corresponding part of the vehicle body.

[0108] Specifically, the types of sealing structures include door sealing strips, door opening sealing strips, glass guide channels, tailgate sealing strips, sunroof sealing strips, and other sealing strips with bubble tube shapes; the parameters of the base frame 101 include structural form, structural parameters, and material parameters.

[0109] The parameters of the inner core 102, connecting arm 103, and base frame 101 are shown in the table below:

[0110] Table 2

[0111]

[0112] Since the sealing structure of each segment is set in a different location, the required vibration isolation frequency is also different. Therefore, local resonance units 100 with different bandgap frequencies can be set in different segments. The local resonance units 100 can be distributed according to the different size of each segment or the different degrees of influence of vibration. Local resonance units 100 with different bandgap frequencies can also be set in the same segment at the same time to achieve broadband vibration isolation.

[0113] The appropriate structural parameters of the inner core 102 and connecting arm 103, as well as the appropriate materials, and the distribution of local resonant units 100 in each segmented sealing structure can be determined by repeatedly calculating, analyzing and verifying using finite element software such as Comsol Multiphysics.

[0114] This embodiment also provides an automobile that includes the above-described local resonance sealing structure and has all the advantages of the above-described local resonance sealing structure.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A localized resonant sealing structure, characterized in that, The device includes a bubble tube section (1) and a connecting section (2). The bubble tube section (1) is a tubular structure. The bubble tube section (1) includes several local resonance units (100) arranged along the length direction. Each local resonance unit (100) includes a base frame (101), an inner core (102) and a connecting arm (103). The base frame (101) is the tube wall of the bubble tube section (1). The base frame (101) is provided with a resonance cavity. The inner core (102) is housed in the center of the resonance cavity. The inner core (102) and the base frame (101) are suspended and elastically connected by the connecting arm (103). The connecting section (2) is fixedly connected to the outer wall of the bubble tube section (1).

2. The localized resonance sealing structure according to claim 1, characterized in that, The inner core (102) is a regular block geometric structure. At least three connecting arms (103) are fixedly connected between the inner core (102) and the inner wall of the base frame (101). The connecting arms (103) are evenly arranged along the circumference of the cross-section of the inner core (102), and the arrangement angle of each connecting arm (103) is the same. The connecting arms (103) are made of elastic material.

3. The localized resonance sealing structure according to claim 2, characterized in that, The local resonant sealing structure includes at least two segments arranged along the length direction, and the local resonant units (100) arranged in two adjacent segments have different bandgap frequencies.

4. The localized resonance sealing structure according to claim 2, characterized in that, The local resonant sealing structure includes at least two segments arranged along the length direction, wherein at least one segment is provided with at least two local resonant units (100) with different bandgap frequencies, and each segment includes a local resonant unit (100) with a bandgap frequency different from that of the adjacent segment.

5. The localized resonance sealing structure according to claim 2, characterized in that, The cross-section of the base frame (101) is ear-shaped, the inner core (102) is a spherical structure, and four connecting arms (103) are connected between the inner core (102) and the base frame (101). Each connecting arm (103) is a cylindrical structure, and the two ends of the connecting arm (103) are fixedly connected to the outer surface of the inner core (102) and the inner wall of the base frame (101), respectively.

6. The localized resonance sealing structure according to claim 5, characterized in that, The local resonance sealing structure is a door sealing strip. Each part of the door sealing strip is made of rubber material with a material density of 650 kg / m3, a Poisson's ratio of 0.4, and an equivalent elastic modulus of 2.3 MPa under compression. Multiple identical local resonance units (100) are arranged at equal intervals inside the door sealing strip. The spacing a of the local resonance units (100) is 80 mm. The thickness h of the base frame (101) of the local resonance structure is 1.6 mm. The diameter d of the inner core (102) ranges from 1 mm to 5 mm. The diameter b of the connecting arm (103) is 0.5 mm. The arrangement angle θ of the connecting arm (103) ranges from 0° to 45°.

7. The localized resonance sealing structure according to claim 2, characterized in that, The cross-section of the base frame (101) is ear-shaped, and the inner core (102) is a regular polygonal prism structure. Multiple connecting arms (103) are connected between the inner core (102) and the base frame (101). The number of connecting arms (103) is the same as the number of sides of the inner core (102). Each connecting arm (103) is a cylindrical structure. The two ends of the connecting arm (103) are fixedly connected to the outer surface of the inner core (102) and the inner wall of the base frame (101), respectively. Multiple connecting arms (103) are fixedly connected to the centers of multiple sides of the inner core (102) at equal angles.

8. The localized resonance sealing structure according to claim 2, characterized in that, The cross-section of the base frame (101) is ear-shaped, and the inner core (102) is a cylindrical structure. Four connecting arms (103) connect the inner core (102) and the base frame (101). Each connecting arm (103) is a wedge-shaped structure. The width of the end of the connecting arm (103) that is fixedly connected to the cylindrical surface of the inner core (102) is smaller than the width of the end that is fixedly connected to the inner wall of the base frame (101). The connecting arms (103) are evenly arranged along the circumference of the cross-section of the inner core (102), and the arrangement angle of each connecting arm (103) is the same.

9. A method for arranging a localized resonant sealing structure, characterized in that, Based on the localized resonant sealing structure as described in any one of claims 1-8, the steps include: The parameters of the base frame (101) are determined according to the type of sealing structure; The structural forms of the inner core (102) and connecting arm (103) are determined based on the structural form of the base frame (101); The sealing structure is divided into sections based on its location, and the vibration isolation frequency of each section of the sealing structure is determined. Analyze and determine the structural parameters of the inner core (102) and connecting arm (103) and select appropriate materials; The distribution of local resonant units (100) in each segment of the sealed structure was analyzed and determined; Based on the analysis results, a local resonance sealing structure was fabricated and installed on the corresponding part of the vehicle body.

10. A car, characterized in that, Includes the localized resonant sealing structure as described in any one of claims 1-8.

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