A multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system

Abstract

This invention discloses a multi-mode, multi-degree-of-freedom mesh-effect amplified damping vibration reduction system, relating to the field of damping vibration reduction and noise reduction technology. It includes: several damping structures, each comprising a damping layer, the damping layer comprising a frame, and within the frame comprising several cantilever arms on the same plane with different orientations at their free ends, and several torsional connecting arms on the same plane with opposite orientations; each cantilever arm has a mass segment at its free end; each torsional connecting arm comprises a central inertia segment, both sides of which are connected to the frame via fixed arms; two fixed arms are eccentrically connected to the central inertia segment and are located on either side of the center of the central inertia segment; each damping layer is connected to a base structure via a supporting structural unit. Using this solution, high-efficiency low-to-medium frequency vibration reduction can be achieved by amplifying the structural damping effect and modulating elastic waves through multi-mode / multi-degree-of-freedom vibration and its coupling effect.

Description

Technical Field

[0001] This invention relates to the field of damping, vibration reduction, and noise reduction technology, specifically to a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. Background Technology

[0002] Plate and shell structures are widely used in vehicles such as aircraft, ships, trains, and automobiles. Their acoustic characteristics directly affect the internal noise environment. Furthermore, these equipment are subjected to complex loads during operation, causing strong vibrations in these thin-walled structures, which may lead to structural fatigue, reduced structural lifespan, and potential safety issues. Consequently, vibration reduction and noise control of plate and shell structures have received widespread attention.

[0003] Damping is an important method in the vibration reduction and noise reduction design of plate and shell structures, offering advantages such as ease of use, good vibration reduction effect at mid-to-high frequencies, and wide operating bandwidth. Generally, damping vibration reduction design can be divided into discrete damping and continuous damping based on its distribution. The former mainly refers to various types of dampers, while the latter includes free damping and constrained damping. Common dampers include resonant dampers, fluid dampers, and passive / active piezoelectric dampers. A typical design concept is a single-degree-of-freedom damped resonant vibration absorber. When applied to plate and shell structures, it is usually installed at locations of strong vibration. Its main drawbacks are a narrow low-frequency operating bandwidth and high requirements for installation location selection. Free damping is achieved by covering a large area of ​​polymer damping material on the surface of the base plate and shell structure. When the base structure vibrates, the free damping layer undergoes tensile and compressive deformation, dissipating energy. It is simple to operate, but its effect is usually relatively weak, especially at low frequencies. Constrained damping adds a constraint layer to the outer surface of free damping. When the base structure vibrates and deforms, the damping layer can undergo significant shear deformation and dissipate energy due to the constraint layer. Compared with free damping, its energy dissipation capacity is significantly increased, but the structural weight increases, the installation requirements are raised, and the low-frequency vibration reduction effect is still relatively limited.

[0004] In recent years, research on phonon crystals and acoustic metamaterials has attracted widespread attention, and related design concepts have become a hot topic and frontier in the field of vibration reduction and noise reduction, demonstrating significant application value. In the area of ​​vibration reduction and noise reduction for plate structures, a typical design involves adding a periodic array of local resonant units to the surface of the plate structure to form an acoustic metamaterial plate structure. Typical local resonant units include bi-component vibration absorbers composed of soft and hard material units, and metal cantilever beam structure vibration absorbers. Generally, designs based on this idea primarily generate elastic wave bandgaps by adding local resonant units, thereby suppressing vibration transmission and reducing radiated noise. While related research also explores the effect of damping, this relies primarily on the designed discrete distributed local resonant structures using soft material units with certain damping, and mainly focuses on bandgap acquisition and widening, making it difficult to effectively suppress low-frequency vibrations. In addition, the common acoustic metamaterial plate structure design uses discretely distributed local resonant units, which is quite inconvenient in practical applications and time-consuming to install; moreover, due to its working principle, it usually requires a large additional mass cost, and it is also difficult to achieve low-frequency, wide-band vibration and noise suppression. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention aims to provide a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. This solution utilizes multi-mode / multi-degree-of-freedom vibration and their coupling effects to achieve amplified structural damping effects and elastic wave-controlled high-efficiency vibration reduction at low and medium frequencies.

[0006] This invention is achieved through the following technical solution:

[0007] A multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system, comprising:

[0008] Several vibration damping structures are provided, each including a damping layer and a frame. Inside the frame are several cantilever arms on the same plane with their free ends facing different directions, and several torsional connecting arms on the same plane and facing opposite directions. Each cantilever arm has a mass segment at its free end. Each torsional connecting arm includes a central inertia segment, with both sides of the central inertia segment connected to the frame via fixed arms. Two fixed arms are eccentrically connected to the central inertia segment and are located on either side of the center of the central inertia segment.

[0009] Each of the damping layers is connected to the base structure via a support structure unit; the support structure unit is used to separate the damping layer from the base structure.

[0010] Compared to existing technologies, the low-frequency vibration reduction effect of discrete damping, continuous damping, and acoustic metamaterial plate structure design is still relatively limited, and there are also difficulties in achieving low-frequency and wide-band vibration and noise suppression. This invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. By adopting this solution, which addresses the needs of lightweight, low-frequency, and wide-band vibration reduction and noise reduction for equipment plate and shell structures, and integrates multi-mode, multi-degree-of-freedom structural resonance and dynamic vibration absorption design, the vibration reduction and noise reduction effect in the mid-to-low frequency range can be significantly improved. In the specific structure, the vibration reduction structure includes a damping layer, which comprises a frame. Inside the frame, several cantilever and torsional connecting arms are respectively arranged. The fixed end of the cantilever is connected to the frame, while the free end is suspended. A mass segment is located at the free end, which is an end structure with a certain mass. Preferably, an enlarged cross-section structure is used. Rectangular, circular, or L-shaped enlarged cross-sections can be used to better utilize the limited additional mass. The mass segment can adjust the resonant frequency of the cantilever. A movable end enlarged structure unit design can also be used. Furthermore, the cantilever arms are all in the same plane, and the free ends face different directions within this plane, thus enabling vibration reduction in multiple degrees of freedom. For vibration reduction, similarly, the torsional connecting arm includes a central inertia segment, with fixed arms on both sides of the central inertia segment being eccentrically connected and located on either side of the center of the central inertia segment. Thus, through the translational and rotational movements of the central inertia segment in different directions, and its coupling with the fixed arms, richer structural resonance can be obtained, and a stronger effect can be applied to the frame, resulting in a more significant vibration reduction effect over a wider low-frequency range. Since several torsional connecting arms are located in the same plane and have different orientations, the vibration reduction effect can be improved in multiple directions. The central inertia segment can also adopt an enlarged cross-section structure, such as a circular, rectangular, or annular shape. The damping layer can be made of high-damping polymer materials such as rubber or plastic, and it is preferable to have the same dimensions in the thickness direction.

[0011] Secondly, in this design, the damping layer is connected to the base structure via supporting structural units, thereby transmitting vibrations and forces. However, the damping layer is also separated from the base structure to reduce constraints on it, allowing for sufficient vibration and deformation. Supporting structural units can be placed in the circumferential area of ​​the frame and at mounting nodes. These units can use the same material as the damping layer or a different, harder material to ensure effective transmission of interaction between the damping layer and the base structure. Furthermore, while supporting structural units can be made of materials with relatively low elastic modulus, such as rubber, it is not recommended to use softer materials or structures with lower stiffness. The main principle is to avoid vibration isolation effects in the desired frequency bands, which would reduce the effect of the mesh-like damping layer on the base structure. Additionally, although the damping layer and supporting structural units are designed independently in this design, they can be integrated into a single design and fabrication.

[0012] In the above scheme, the damping layer can be placed on the surface of the substrate shell structure to be vibration-damped and noise-reduced. When the substrate structure vibrates under dynamic excitation, it causes the mesh-like damping structure to vibrate, generating a reaction force applied to the substrate structure and strong energy dissipation inside the damping structure. Due to the structure of the mesh-like damping layer, its torsional connecting arms and cantilever will undergo multi-mode vibrations such as longitudinal vibration, bending vibration, and torsional vibration, which will correspondingly generate forces and moments acting on the substrate structure in different directions, thereby achieving the effect of suppressing substrate vibration in multiple modes / multi-degrees of freedom. Similarly, due to the structure of the mesh-like damping layer, the torsional connecting arms and cantilever are separated from the substrate structure through the supporting structural unit to ensure that they can generate rich local structural resonances, thereby achieving a significant amplification effect on the reaction force applied to the substrate structure and the energy dissipation inside the damping structure. Its torsional connecting arms and cantilever will resonate with different vibration modes and their coupling modes, thereby significantly enhancing the reaction force / moment applied to the substrate structure. Furthermore, due to the significant amplification effect of structural resonance on vibration response and tensile / compressive / shear deformation, the energy dissipation of the damping material constituting the grid-like damping layer will also be greatly improved. By using cantilever designs with different structural parameters, torsional connecting arm designs with different structural shapes, effective design of vibration modes of different structures, and considering that the elastic modulus of the damping layer material itself is usually much smaller than that of metal materials, combined with reasonable structural parameter settings, grid-like damping structure modes with sufficiently high frequency distribution density can be obtained in the low-frequency range, thereby achieving good vibration reduction and damping amplification effects in the low-frequency range.

[0013] Furthermore, several damping layers are sequentially and compactly connected, arranged in a periodic array; several supporting structural units are arranged in a periodic array on several damping layers. In this scheme, several damping layers are sequentially and compactly connected, arranged in a periodic array, and several supporting structural units are also arranged in a periodic array on the arranged damping layers. That is, the array arrangement can be divided into multiple periodic arrangements, and in special cases, it can also be used as a single period; by extending the vibration reduction system into a periodic array in space, the units are interconnected to form a whole, so that the vibration reduction system has a continuous distribution characteristic in space. In other words, it is not a number of independent small-sized concentrated units, but a sheet that is attached to the installation area of ​​the vibration reduction object, and can be cut to shape according to the specific structural conditions; through the self-adhesive layer or other connection methods, the installation of the damping structure can be conveniently achieved. This vibration reduction system features multi-mode operation, multi-degree-of-freedom structural resonance, high structural resonance frequency distribution density, and spatial distribution continuity. Consequently, it produces significant improvements such as multi-mode multi-degree-of-freedom dynamic vibration absorption, efficient control of local resonance elastic waves, and amplification of tension / compression / shear deformation damping effects. This can significantly enhance the low-frequency vibration reduction and noise reduction effect in thin-walled structures such as plates and shells.

[0014] Furthermore, to adjust the resonant frequency of the cantilever and adapt to vibrations in various frequency bands, the lengths of the cantilever arms are all different. In this scheme, the length of each cantilever arm is selectable and varies; in addition, the mass and cross-sectional shape of the mass segment on the free end of the cantilever arm are selectable, thereby allowing each cantilever arm to adapt to vibrations in various frequency bands through selective combination and control, thus broadening the frequency range under vibration reduction.

[0015] As an optional solution, several torsion connecting arms are respectively disposed at different inner side positions of the frame; several cantilever arms are located within the space enclosed by several torsion connecting arms and the inner side of the frame. In this solution, there can be two torsion connecting arms, which are adjacent to each other and disposed at two inner side positions of the frame, and are parallel to the two inner side positions respectively. In this way, the additional effect generated by the multi-mode multi-degree-of-freedom vibration of the torsion arms in both the lateral and vertical directions acting on the base structure can be realized. Several cantilever arms are disposed in the remaining space of the frame. There can be four cantilever arms, which are orthogonally distributed and have different lengths. In this way, the additional effect generated by longitudinal vibration and torsional vibration along the cantilever axis with different resonant frequencies and different action directions, as well as lateral vibration / bending vibration and torsional vibration in two directions perpendicular to the cantilever axis can be realized. The above design can further save space. Of course, the number, direction, length and other parameters of the torsion connecting arms and cantilever arms can be adjusted.

[0016] As an optional solution, the frame side corresponding to the torsion connecting arm is open; an installation node is provided between two adjacent torsion connecting arms, and both are connected to the installation node through a fixed arm. In this solution, the frame side can be open or closed. When open, an installation node needs to be provided at the top corner of two adjacent open sides to provide a connection point for the torsion connecting arm and the cantilever.

[0017] A further proposed solution involves the periodically arrayed damping layers forming a single, integrally molded structure. That is, the periodically arranged damping layers form a single, integral structure, and then several supporting structural units are sequentially arrayed on these damping layers. Alternatively, a single damping layer can also be a separate, integrally molded structure, such as a frame, cantilever, or torsion arm forming a single, integral structure. By selectively employing integral processing, costs can be saved.

[0018] In a further embodiment, the two ends of the support structure unit are detachably connected to the damping layer and the base structure, respectively.

[0019] As an optional solution, when the supporting structural unit is made of a flexible material, the supporting structural unit consists of several thin layers; both ends of each of these thin layers are connected to the damping layer and the substrate structure respectively through adhesive layers. In this solution, the supporting structural unit preferably uses a flexible material adapted to a single damping layer, such as a thin rubber layer as the supporting structural unit; the supporting structural unit is connected to the damping layer through an inner adhesive layer, and a pre-set adhesive layer that can be pasted onto the surface of the substrate structure and a protective film layer are also provided. The film layer is used to protect the outer adhesive layer and can be peeled off when the mesh-like damping structure is in use. The film layer can be prepared using materials such as laminated paper. This design is adopted because, firstly, both the damping layer and the supporting structural unit have good deformation capabilities. Even if the bottom surface of the supporting structural unit is flat, when it is used in a shell with a certain curvature, it can still achieve a good fit without the need to separately prepare a supporting structural unit with a curved bottom surface, thus having better structural adaptability; secondly, the overall structure has a very small dimension in the thickness direction, occupying less space.

[0020] As an optional solution, when the supporting structure unit is made of rigid material, the supporting structure unit consists of several connecting columns. One end of each connecting column is detachably connected to the damping layer, and the other end of each connecting column is connected to the substrate structure via an adhesive layer. In this solution, rigid material columns are used as the supporting structure unit, such as connecting columns. The supporting structure unit can be connected to the damping layer via an adhesive layer, or the connection can be achieved directly through a tight fit between the two, such as by opening several holes in the damping layer to achieve detachable connection via connecting columns. The supporting structure unit can also be connected to the substrate structure via an adhesive layer. This design has two advantages: first, the supporting structure unit is relatively long, thus increasing the lever arm between the damping layer and the substrate structure, allowing for the application of a larger reaction torque and more effectively suppressing substrate vibration; second, the longer lever arm can also amplify the excitation amplitude of the grid-like damping layer, causing greater tensile / compressive / shear deformation of the damping layer and improving the damping dissipation effect.

[0021] To protect the outermost adhesive layer, a film layer is attached to the adhesive layer away from the damping layer.

[0022] As an optional solution, the vibration reduction structure includes at least two damping layers. In this structure, several damping layers are arranged sequentially at intervals, and adjacent damping layers are connected by the supporting structural unit. In this solution, the structural parameters of the two damping layers can be differentiated, thereby introducing richer structural modes and more effectively suppressing the vibration of the base structure.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] 1. This invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system, which has design effects such as multi-mode action, multi-degree-of-freedom structural resonance, high structural resonance frequency distribution density, and spatial distribution continuity. As a result, it produces significant improvements such as multi-mode, multi-degree-of-freedom dynamic vibration absorption, efficient control of local resonant elastic waves, and amplification of tension / compression / shear deformation damping effects, which can significantly improve the low-frequency vibration reduction and noise reduction effect in thin-walled structures such as plates and shells.

[0025] 2. This invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. Through end-amplified cantilever design with different structural parameters, connecting arm design with different structural shapes, effective design of vibration modes of different structures, and the fact that the elastic modulus of the damping layer material itself is usually much smaller than that of metal materials, combined with reasonable structural parameter settings, a grid-effect damping structure mode with sufficiently high frequency distribution density can be obtained in the low-frequency band, thereby achieving good vibration reduction and damping amplification effects in the low-frequency band.

[0026] 3. This invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. The grid-effect damping layer is connected to the substrate structure to be damped through a supporting structural unit, thereby transmitting vibration and force. However, the damping layer is separated from the substrate structure to reduce the constraint on the damping layer, allowing it to generate sufficient vibration and deformation. The torsional connecting arms and cantilever of the damping layer are separated from the substrate structure to ensure that it can generate rich local structural resonance, thereby achieving a significant amplification effect on the reaction force applied to the substrate structure and the energy dissipation inside the damping structure.

[0027] 4. This invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. The vibration reduction system is periodically arrayed and extended in space, with the units interconnected to form a whole, giving the vibration reduction system a continuous spatial distribution characteristic. In other words, it is not a series of independent small-sized centralized units, but rather a sheet that is attached to the installation area of ​​the vibration reduction object, and its shape can be cut according to the specific structural conditions. Through the self-adhesive layer, the damping structure can be conveniently installed. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0029] Figure 1 The front view of the vibration reduction structure provided by the present invention (using a single-layer damping layer and thin-layer supporting structural units);

[0030] Figure 2 Provided by the present invention Figure 1 Sectional view of AA;

[0031] Figure 3 The adoption of the present invention Figure 1 A schematic diagram of the vibration reduction system formed by the intermediate vibration reduction structure;

[0032] Figure 4 Three-view diagram of the vibration reduction structure provided by the present invention (using a single-layer damping layer and connecting columns as the supporting structural unit);

[0033] Figure 5 The adoption of the present invention Figure 4 A schematic diagram of the vibration reduction system formed by the intermediate vibration reduction structure;

[0034] Figure 6 Three-view diagram of the vibration reduction structure provided by the present invention (using a double-layer damping layer and connecting columns as the supporting structural unit);

[0035] Figure 7 The adoption of the present invention Figure 6 A schematic diagram of the vibration reduction system formed by the intermediate vibration reduction structure;

[0036] Figure 8 This is a schematic diagram of the vibration reduction system provided by the present invention disposed on the inner side of the base structure.

[0037] Figure 9 This is a schematic diagram of the vibration reduction system provided by the present invention installed on a stiffened shell structure.

[0038] The attached diagram shows the markings and corresponding component names:

[0039] 1-Damping layer, 101-Cantilever, 102-Torsion connecting arm, 103-Mounting node, 104-Frame, 2-Supporting structural unit, 3-Adhesive layer, 4-Membrane layer. Detailed Implementation

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0041] Example 1:

[0042] This embodiment 1 provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system, such as... Figures 1-9 Shown, including:

[0043] Several vibration damping structures are provided, each including a damping layer 1, which includes a frame 104. Inside the frame 104 are several cantilever arms 101 on the same plane with their free ends facing different directions, and several torsional connecting arms 102 on the same plane and facing opposite directions. The free ends of the cantilever arms 101 have mass segments. The torsional connecting arms 102 include a central inertia segment, and both sides of the central inertia segment are connected to the frame 104 via fixed arms. Both fixed arms are eccentrically connected to the central inertia segment and are located on either side of the center of the central inertia segment.

[0044] The support structure unit 2 is used to separate the damping layer 1 from the base structure.

[0045] Compared to existing technologies, the low-frequency vibration reduction effect of discrete damping, continuous damping, and acoustic metamaterial plate structure design is still relatively limited, and there are also difficulties in achieving low-frequency and wide-band vibration and noise suppression. This invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. By adopting this solution, which addresses the needs of lightweight, low-frequency, and wide-band vibration reduction and noise reduction for equipment plate and shell structures, and integrates multi-mode, multi-degree-of-freedom structural resonance and dynamic vibration absorption design, the vibration reduction and noise reduction effect in the mid-to-low frequency range can be significantly improved. In the specific structure, the vibration reduction structure includes a damping layer 1, which includes a frame 104. Inside the frame 104, several cantilever arms 101 and torsional connecting arms 102 are respectively arranged. The fixed end of the cantilever arm 101 is connected to the frame 104, while the free end is suspended. A mass segment is provided at the free end, which is an end structure with a certain mass. Preferably, an enlarged cross-section structure is adopted. An enlarged cross-section with rectangular, circular, or L-shaped shapes can be used to better utilize the limited additional mass. The mass segment can adjust the resonant frequency of the cantilever arm 101. A movable end enlarged structure unit design can also be used. Furthermore, the several cantilever arms 101 are all in the same plane, and the free ends face different directions within this plane. Thus, Vibration reduction is achieved in multiple degrees of freedom. Similarly, the torsional connecting arm 102 includes a central inertia segment, with fixed arms on both sides of the central inertia segment being eccentrically connected and located on both sides of the center of the central inertia segment. In this way, through the translational and rotational motions of the central inertia segment in different directions and its coupling with the fixed arms, richer structural resonances can be obtained, and a stronger effect can be applied to the frame 104, thereby achieving a more significant vibration reduction effect in a wider low-frequency range. Since several torsional connecting arms 102 are located in the same plane and have different orientations, the vibration reduction effect can be improved in multiple directions. The central inertia segment can also adopt an enlarged cross-section structure, such as an enlarged cross-section in the shape of a circle, rectangle, or ring. The damping layer 1 can be made of polymer materials with large damping, such as rubber or plastic, and it is preferred to have the same size in the thickness direction.

[0046] Secondly, in this scheme, the damping layer 1 is connected to the base structure through the supporting structural unit 2, thereby transmitting vibration and force. However, the damping layer 1 is also separated from the base structure to reduce constraints on it, allowing for sufficient vibration and deformation. The supporting structural unit 2 can be installed in the circumferential area of ​​the frame 104 and on the mounting nodes 103. The supporting structural unit 2 can use the same material as the damping layer 1, or a harder material of a different material, to ensure effective transmission of the interaction between the damping layer 1 and the base structure. Furthermore, although the supporting structural unit 2 can be made of materials with relatively low elastic modulus, such as rubber, it is not recommended to use softer materials or structures with lower stiffness. The main principle is to avoid vibration isolation effects in the frequency band of interest, which would reduce the effect of the mesh-like damping layer 1 on the base structure. Additionally, although the damping layer 1 and the supporting structural unit 2 are independently designed in this scheme, they can be integrated into a single design and fabrication.

[0047] In the above scheme, the damping layer 1 can be placed on the surface of the substrate shell structure to be vibration-damped and noise-reduced. When the substrate structure vibrates under dynamic excitation, it causes the mesh-like damping structure to vibrate, generating a reaction force applied to the substrate structure and strong energy dissipation inside the damping structure. Based on the structure of the mesh-like damping layer 1, it can be seen that its torsional connecting arm 102 and cantilever 101 will undergo multi-mode vibrations such as longitudinal vibration, bending vibration, and torsional vibration, correspondingly generating forces and moments acting on the substrate structure in different directions, thus achieving multi-mode vibration reduction. The effect of suppressing matrix vibration with multiple degrees of freedom; similarly, the structure of the mesh-like damping layer 1 is used to separate the torsional connecting arm 102 and cantilever 101 from the matrix structure through the supporting structural unit 2, so as to ensure that it can generate rich local structural resonance, thereby realizing the significant amplification effect of the reaction force applied to the matrix structure and the energy dissipation inside the damping structure; its torsional connecting arm 102 and cantilever 101 will resonate with different vibration modes and their coupling modes, thereby significantly enhancing the reaction force / torque applied to the matrix structure. Furthermore, due to the significant amplification effect of structural resonance on vibration response and tensile / compressive / shear deformation, the energy dissipation of the damping material constituting the mesh-like damping layer 1 will also be greatly improved. Moreover, through the design of cantilever 101 with different structural parameters, the design of torsion connecting arm 102 with different structural shapes, the effective design of vibration modes of each structure, and the fact that the elastic modulus of the damping layer 1 material itself is usually much smaller than that of metal materials, combined with reasonable structural parameter settings, a mesh-like damping structure mode with a sufficiently high frequency distribution density can be obtained in the low-frequency band, thereby achieving good vibration reduction and damping amplification effects in the low-frequency band.

[0048] In this embodiment, several damping layers 1 are sequentially and compactly connected, arranged in a periodic array; several supporting structural units 2 are arranged in a periodic array on several damping layers 1. In this scheme, several damping layers 1 are sequentially and compactly connected, arranged in a periodic array, while several supporting structural units 2 are also arranged in a periodic array on the arranged damping layers 1. That is, the array arrangement can be divided into multiple periodic arrangements, and in special cases, it can also be used as a single period; by extending the vibration reduction system into a periodic array in space, the units are interconnected to form a whole, giving the vibration reduction system a continuous spatial distribution characteristic. In other words, it is not several independent small-sized concentrated units, but rather a sheet applied to the installation area of ​​the vibration reduction object, and its shape can be cut according to the specific structural conditions; through the built-in adhesive layer 3 or other connection methods, convenient installation of the damping structure can be achieved. This vibration reduction system features multi-mode operation, multi-degree-of-freedom structural resonance, high structural resonance frequency distribution density, and spatial distribution continuity. Consequently, it produces significant improvements such as multi-mode multi-degree-of-freedom dynamic vibration absorption, efficient control of local resonance elastic waves, and amplification of tension / compression / shear deformation damping effects. This can significantly enhance the low-frequency vibration reduction and noise reduction effect in thin-walled structures such as plates and shells.

[0049] In this embodiment, to adjust the resonant frequency of the cantilever 101 and adapt to vibrations in various frequency bands, the lengths of the cantilever 101 are all different. In this scheme, the length of each cantilever 101 is selectable and different; in addition, the mass and cross-sectional shape of the mass segment on the free end of the cantilever 101 are selectable, so that by selectively combining and adjusting, each cantilever 101 can adapt to vibrations in various frequency bands, thereby broadening the frequency range under vibration reduction.

[0050] As an optional solution, the plurality of torsion connecting arms 102 are respectively disposed at different inner side positions of the frame 104; the plurality of cantilever arms 101 are all located within the space enclosed by the plurality of torsion connecting arms 102 and the inner side of the frame 104. In this design, two torsion connecting arms 102 can be configured, with each arm adjacent to the other and positioned on one of the two inner sides of the frame 104, parallel to the inner sides. This allows for additional effects from the multi-mode, multi-degree-of-freedom vibration of the torsion arms acting on the base structure in both the lateral and vertical directions. Several cantilever arms 101 are then positioned within the remaining space of the frame 104. Four cantilever arms 101 can be configured, orthogonally distributed with varying lengths. This allows for additional effects from longitudinal and torsional vibrations along the axis of the cantilever arms 101 at different resonant frequencies and in different directions, as well as lateral / bending and torsional vibrations in the two directions perpendicular to the axis of the cantilever arms 101. This design further saves space. Of course, the number, direction, and length of the torsion connecting arms 102 and cantilever arms 101 can all be adjusted.

[0051] As an optional solution, the side of the frame 104 corresponding to the torsion connecting arm 102 is open; an installation node 103 is provided between two adjacent torsion connecting arms 102, and both are connected by a fixed arm and the installation node 103. In this solution, the side of the frame 104 can be open or closed. When open, an installation node 103 needs to be provided at the top corner of two adjacent open sides to provide a connection point for the torsion connecting arm 102 and the cantilever 101.

[0052] A further proposed solution is that the periodically arrayed damping layers 1 are integrally molded structures. That is, the periodically arranged damping layers 1 are integral structures, and then the supporting structural units 2 are sequentially arrayed on the damping layers 1. Of course, a single damping layer 1 can also be a separate integral structure, that is, the frame 104, cantilever 101, torsion arm are integral structures, etc. By selectively performing integral processing, costs can be saved.

[0053] In this embodiment, the two ends of the support structure unit 2 are detachably connected to the damping layer 1 and the base structure, respectively.

[0054] Example 2:

[0055] This embodiment 2 is a further optimization based on embodiment 1, such as... Figures 1-7 As shown, multiple configuration methods for the supporting structural unit 2 are provided.

[0056] As an optional solution, when the supporting structural unit 2 is made of flexible material, the supporting structural unit 2 consists of several thin layers; both ends of the several thin layers are connected to the damping layer 1 and the substrate structure respectively through adhesive layers 3. In this solution, the supporting structural unit 2 preferably uses a flexible material adapted to a single damping layer 1, such as using a rubber thin layer as the supporting structural unit 2; the supporting structural unit 2 is connected to the damping layer 1 through the inner adhesive layer 3, and a pre-set adhesive layer 3 that can be pasted onto the surface of the substrate structure and its protective film layer 4 are also provided. The film layer 4 is used to protect the outer adhesive layer 3 and can be peeled off when the mesh-like damping structure is used. The film layer 4 can be prepared using materials such as laminated paper. This design is adopted because, firstly, both the damping layer 1 and the supporting structural unit 2 have good deformation capabilities. Even if the bottom surface of the supporting structural unit 2 is flat, when it is used in a shell with a certain curvature, it can still achieve a good fit without the need to separately prepare a supporting structural unit 2 with a curved bottom surface, thus having better structural adaptability; secondly, the overall structure has a very small dimension in the thickness direction, occupying less space.

[0057] As an optional solution, when the supporting structure unit 2 is made of rigid material, the supporting structure unit 2 consists of several connecting columns. One end of each connecting column is detachably connected to the damping layer 1, and the other end of each connecting column is connected to the substrate structure via an adhesive layer 3. In this solution, rigid material columns are used as the supporting structure unit 2. If connecting columns are used, the supporting structure unit 2 can be connected to the damping layer 1 via the adhesive layer 3, or the connection can be achieved directly through a tight fit between the two. For example, several insertion holes are opened in the damping layer 1 to achieve detachable connection via the connecting columns. The supporting structure unit 2 can also be connected to the substrate structure via the adhesive layer 3. This design has two advantages: first, the supporting structure unit 2 is relatively long, thus increasing the lever arm between the damping layer 1 and the substrate structure, allowing for the application of a larger reaction torque, which more effectively suppresses substrate vibration; second, the longer lever arm can also amplify the excitation amplitude of the mesh-like damping layer 1, causing greater tensile / compressive / shear deformation of the damping layer 1 and improving the damping dissipation effect.

[0058] To protect the outermost adhesive layer 3, a film layer 4 is attached to the adhesive layer 3 away from the damping layer 1.

[0059] Example 3:

[0060] This embodiment 3 is a further optimization based on embodiment 1 or embodiment 2, such as... Figure 6 and Figure 7 As shown, the method of setting the multi-layer damping layer 1 of the vibration reduction structure is provided.

[0061] As an optional solution, the vibration reduction structure includes at least two damping layers 1. In the vibration reduction structure, several damping layers 1 are arranged sequentially at intervals, and adjacent damping layers 1 are connected by the supporting structural unit 2. In this solution, the structural parameters of the two damping layers 1 can be set differently, thereby introducing richer structural modes and more effectively suppressing the vibration of the base structure.

[0062] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system, characterized in that, include: Several vibration damping structures are provided, each including a damping layer (1), the damping layer (1) including a frame (104), the frame (104) including several cantilever (101) on the same plane with different orientations of their free ends, and several torsional connecting arms (102) on the same plane with opposite orientations; the free ends of the cantilever (101) are equipped with mass segments; the torsional connecting arms (102) include a central inertia segment, both sides of which are connected to the frame through fixed arms; both fixed arms are eccentrically connected to the central inertia segment and are located on both sides of the center of the central inertia segment respectively; The support structure unit (2) is used to separate the damping layer (1) from the base structure. Each of the damping layers (1) is connected to the base structure through the support structure unit (2).

2. The multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 1, characterized in that, Several damping layers (1) are connected in a compact sequence and arranged in a periodic array; several supporting structural units (2) are arranged in a periodic array on several damping layers (1).

3. The multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 1, characterized in that, The lengths of the various cantilever (101) are all different.

4. The multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 1, characterized in that, The plurality of torsion connecting arms (102) are respectively disposed at different inner side positions of the frame (104); the plurality of cantilever arms (101) are located within the space enclosed by the plurality of torsion connecting arms (102) and the inner side of the frame (104).

5. The multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 1, characterized in that, The frame (104) corresponding to the torsion connecting arm (102) has an open side; an installation node (103) is provided between two adjacent torsion connecting arms (102), and both are connected to the installation node (103) through a fixed arm.

6. The multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 1, characterized in that, The damping layers (1) arranged in a periodic array are integrally molded structures.

7. The multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 2, characterized in that, When the supporting structure unit (2) is made of a flexible material, the supporting structure unit (2) consists of several thin layers; Both ends of several thin layers are connected to the damping layer (1) and the matrix structure respectively through an adhesive layer (3).

8. The multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 2, characterized in that, When the support structure unit (2) is made of rigid material, the support structure unit (2) consists of several connecting columns. One end of each of the several connecting columns is detachably connected to the damping layer (1), and the other end of each of the several connecting columns is connected to the base structure through an adhesive layer (3).

9. A multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to any one of claims 7 or 8, characterized in that, A film layer (5) is attached to the adhesive layer (3) away from the damping layer (1).

10. A multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 6, characterized in that, The vibration reduction structure includes at least two damping layers (1). In the vibration reduction structure, several damping layers (1) are arranged at intervals in sequence, and adjacent damping layers (1) are connected by the support structure unit (2).

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