Multi-mode multi-degree-of-freedom latticed effect amplification type damping vibration attenuation system

Abstract

The invention discloses a multi-mode multi-degree-of-freedom latticed effect amplification type damping vibration attenuation system, and relates to the technical field of damping vibration attenuation and noise reduction, the multi-mode multi-degree-of-freedom latticed effect amplification type damping vibration attenuation system comprises a plurality of vibration attenuation structures, each vibration attenuation structure comprises a damping layer, and each damping layer comprises a frame body; a plurality of cantilevers and a plurality of torsion connecting arms are arranged in the frame body, wherein the cantilevers are located on the same plane, the free ends of the cantilevers face different directions, and the torsion connecting arms are located on the same plane and face different directions. The free end of the cantilever is provided with a mass section; the torsion connecting arm comprises a middle inertia section, and the two sides of the middle inertia section are connected with the frame body through fixing arms. The two fixed arms are both eccentrically connected with the middle inertia section and located on the two sides of the center of the middle inertia section respectively. And each damping layer is connected with the base body structure through a supporting structure unit. By the adoption of the scheme, through multi-mode / multi-degree-of-freedom vibration and the coupling effect of the multi-mode / multi-degree-of-freedom vibration, structure damping effect amplification and elastic wave regulation and control low and medium frequency efficient vibration reduction are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of damping, vibration reduction and noise reduction, and in particular to a multi-mode and multi-degree-of-freedom grid-like effect amplified damping and vibration reduction system. Background Art

[0002] Plate and shell structures are widely used in aircraft, ships, trains, cars and other vehicles. Their acoustic characteristics have a direct impact on the internal noise environment. At the same time, the related equipment is subjected to complex loads during operation, causing strong vibrations in such thin-walled structures, which may lead to structural fatigue, reduce structural life, and may cause safety problems. Accordingly, the vibration and noise reduction of plate and shell structures has attracted widespread attention.

[0003] Damping treatment is an important means of vibration reduction and noise reduction design for plate and shell structures. It has the advantages of easy use, good medium and high frequency vibration reduction effect, and wide action frequency band. Generally, damping vibration reduction design can be divided into discrete damping and continuous damping according to its distribution. Among them, the former is mainly various types of dampers, and the latter includes free damping and constrained damping. Common dampers include resonant dampers, fluid dampers, passive / active piezoelectric dampers, etc. Among them, the typical design concept is a single-degree-of-freedom damped resonant vibration absorber; when applied to plate and shell structures, it is usually installed in a position with strong vibration. Its main shortcomings are that the low-frequency action frequency band is narrow and the installation position selection requirements are high. Free damping is achieved by applying a large area of ​​polymer damping material to the surface of the base plate and shell structure. When the base structure vibrates, the free damping layer undergoes tensile and compressive deformation and dissipates energy; its operation is simple, but the effect is usually relatively weak, especially for low frequencies. Constrained damping is to add another constraint layer on the outer surface of the free damping. When the base structure vibrates and deforms, the damping layer can undergo obvious shear deformation and dissipate energy due to the limitation of the constraint layer. Compared with the free damping layer, its energy consumption capacity is significantly increased, but the structural weight is increased, the installation requirements are improved, and the low-frequency vibration reduction effect is still relatively limited.

[0004] In recent years, the research on phononic crystals and acoustic metamaterials has received widespread attention, and related design ideas have become hot spots and frontiers in the field of vibration and noise reduction, and have shown great application value. In terms of vibration and noise reduction of plate structures, the typical design is to attach a periodic array of local resonance units on the surface of the plate structure to form an acoustic metamaterial plate structure, where typical local resonance units include dual-component vibration absorbers composed of soft material units and hard material units, metal cantilever beam structure vibration absorbers, etc. Usually, the design based on this idea mainly generates elastic wave bandgap by adding local resonance units, thereby achieving vibration transmission suppression and reducing radiation noise. In related studies, although the influence of damping is also discussed, on the one hand, it relies on the discrete distributed local resonance structure designed and uses soft material units with certain damping. On the other hand, it is still mainly based on bandgap acquisition and widening, and it is difficult to achieve effective suppression of low-frequency vibrations. In addition, the common acoustic metamaterial plate structure design uses discretely distributed local resonance units, which is very 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 and wide-band vibration and noise suppression. Summary of the invention

[0005] The present invention aims to solve the deficiencies of the prior art and to provide a multi-mode, multi-degree-of-freedom grid-like effect amplified damping vibration reduction system. The present invention can achieve high-efficiency vibration reduction in the medium and low frequencies by amplifying the structural damping effect and regulating elastic waves through multi-mode / multi-degree-of-freedom vibration and its coupling.

[0006] The present invention is achieved through the following technical solutions:

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

[0008] A plurality of vibration reduction structures, wherein the vibration reduction structures include a damping layer, the damping layer includes a frame, the frame includes a plurality of cantilevers on the same plane and with free ends in different directions, and a plurality of torsion connecting arms on the same plane and in different directions; the free ends of the cantilevers are provided with mass sections; the torsion connecting arms include a middle inertia section, both sides of the middle inertia section are connected to the frame through fixed arms; the two fixed arms are eccentrically connected to the middle inertia section, and are respectively located on both sides of the center of the middle inertia section;

[0009] Support structure unit, each of the damping layers is connected to the base structure through the support structure unit; the support structure unit is used to separate the damping layer from the base structure.

[0010] Compared with the prior art, the low-frequency vibration reduction effects of discrete damping, continuous damping and acoustic metamaterial plate structure designs are still relatively limited, and it is also difficult to achieve low-frequency and wide-band vibration and noise suppression. The present invention provides a multi-mode and multi-degree-of-freedom grid effect amplification damping and vibration reduction system. By adopting this solution, the needs of lightweight, low-frequency, and wide-band vibration and noise reduction of equipment plate and shell structures are met, and multi-mode and multi-degree-of-freedom structural resonance and dynamic vibration absorption design are integrated to significantly improve the medium and low-frequency vibration and noise reduction effects. In the specific structure, the vibration reduction structure includes a damping layer, and the damping layer includes a frame. Inside the frame, a plurality of cantilevers and torsion connecting arms are respectively arranged, wherein the fixed end of the cantilever is connected to the frame, and the free end is suspended in the air, and a mass section is provided at the free end. The mass section is an end structure with a certain mass. It is preferred to adopt a cross-section enlargement structure. If an enlarged cross-section of a rectangular, circular, L-shaped or other shape is adopted to achieve better utilization of the limited additional mass, the mass section can regulate the resonant frequency of the cantilever, and a movable end enlargement structure unit design can also be adopted; in addition, the plurality of cantilevers are all in the same plane, and the free ends face different directions in the plane, so that the cantilever can be realized in multiple degrees of freedom directions. Similarly, the torsion connecting arm includes a middle inertia section, and the fixed arms on both sides of the middle inertia section are eccentrically connected and located on both sides of the center of the middle inertia section. In this way, through the translational movement and rotational movement of the middle inertia section in different directions and its coupling with the fixed arm, richer structural resonance can be obtained, and a stronger effect applied to the frame can be obtained, thereby achieving a more significant vibration reduction effect in a wider low-frequency band; and several torsion connecting arms are all located in the same plane and are set in different directions, so that the vibration reduction effect can be improved in multiple directions; among them, the middle inertia section can also adopt a cross-section enlargement structure, if a circular, rectangular, annular and other shaped enlarged cross-section is adopted. The damping layer can be made of high-molecular materials with large damping, such as rubber and plastic, and priority is given to having the same size in the thickness direction.

[0011] Secondly, in this scheme, the damping layer is connected to the base structure through the support structure unit, thereby transmitting the effects of vibration and force, but the damping layer and the base structure are separated to reduce the constraints on the damping layer so that it can produce sufficient vibration and deformation; the support structure unit can be set in the circumferential area of ​​the frame and on the installation node. Among them, the support structure unit can use the same material as the damping layer, or a harder material of a different material to ensure the effective transmission of the interaction between the damping layer and the base structure. In addition, although the support structure unit can be prepared using materials with relatively low elastic modulus such as rubber, it is not recommended to use softer materials / lower stiffness structures for the support structure unit. The main principle is to avoid it from producing a vibration isolation effect in the frequency band of interest, but instead reduce the effect of the grid-like damping layer on the base structure. In addition, although the damping layer and the support structure unit are independently set in this scheme, the two can be designed and prepared in an integrated manner.

[0012] In the above scheme, the damping layer can be set on the surface of the base plate and shell structure to be used for vibration and noise reduction; when the base structure vibrates under dynamic excitation, the grid-like damping structure is caused to vibrate, and a reaction force applied to the base structure and strong energy dissipation inside the damping structure are generated; from the structural setting of the grid-like damping layer, it can be seen that its torsion connecting arm and cantilever will undergo multi-mode vibrations such as longitudinal vibration, bending vibration, and torsional vibration, and correspondingly form forces and torques acting in different directions on the base structure, thereby achieving a multi-mode / multi-degree-of-freedom effect of suppressing base vibration; similarly, from the structural setting of the grid-like damping layer, the torsion connecting arm and cantilever are separated from the base structure through the supporting structure unit to ensure that they can generate rich local structural resonances, thereby achieving a significant amplification effect of the reaction force applied to the base structure and the energy dissipation inside the damping structure; its torsion connecting arm and cantilever will resonate with different vibration modes and their coupling modes, thereby significantly enhancing the reaction force / torque applied to the base structure. Moreover, 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 damping layer will also be greatly improved; and through cantilever design with different structural parameters, torsional connecting arm design with different structural shapes, effective design of vibration modes of each structure in different modes, and the elastic modulus of the damping layer material itself is usually much smaller than that of metal material, combined with reasonable structural parameter setting, a grid damping structural 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.

[0013] Furthermore, several of the damping layers are closely connected in sequence and arranged in a periodic array; several of the supporting structure units are arranged in a periodic array on several of the damping layers. In this solution, several of the damping layers are closely connected in sequence and arranged in a periodic array, and several supporting structure units are also arranged in a periodic array on several arranged damping layers. That is, the array arrangement can be divided into multiple periodic arrangements, and can also be used as a single period under special circumstances; the vibration reduction system is formed by extending the periodic array in space, and the units are connected to each other to form a whole, so that the vibration reduction system has a continuous distribution feature in space. In other words, it is not a number of independent small-sized concentrated units, but a piece of affixed to the installation area of ​​the vibration reduction object, and can be cut into shape according to the specific structural conditions; the damping structure can be conveniently installed by means of a self-contained adhesive layer or other connection methods. The vibration reduction system has design effects such as multi-mode action, multi-degree-of-freedom structural resonance, high structural resonance frequency distribution density, and spatial distribution continuity. Furthermore, it produces significant improvements such as multi-mode and multi-degree-of-freedom dynamic vibration absorption, efficient regulation of local resonant elastic waves, and amplification of tension, compression / shear deformation damping effects. It can significantly improve the low-frequency vibration and noise reduction effects in thin-walled structures such as plates and shells.

[0014] Furthermore, in order to adjust the resonant frequency of the cantilever and adapt to the vibration in each frequency band, the lengths of the cantilevers are different. In this solution, the length of each cantilever is optional and different; in addition, the mass and cross-sectional profile of the mass section on the free end of the cantilever are optional, so that each cantilever can be adapted to the vibration in each frequency band through selective combination regulation, so as to broaden the frequency band range under the vibration reduction effect.

[0015] As an optional solution, the several torsion connecting arms are respectively arranged at different inner side positions of the frame; the several cantilevers are located in the space enclosed by the several torsion connecting arms and the inner side of the frame. In this solution, two torsion connecting arms can be arranged, and the two torsion connecting arms are adjacent and arranged at the two inner side positions of the frame, and are respectively parallel to the two inner sides, so that the additional effect caused by the multi-mode multi-degree-of-freedom vibration of the torsion arm acting on the base structure in the lateral and vertical directions can be achieved; the several cantilevers are arranged in the remaining space of the frame, and the cantilevers can be arranged in four, and the four cantilevers are orthogonally distributed and have different lengths, so that the additional effects caused by the longitudinal vibration and torsion vibration along the cantilever axis with different resonant frequencies and different action directions, as well as the lateral vibration / bending vibration and torsion vibration in two directions perpendicular to the cantilever axis can be achieved; the above design can further achieve the effect of saving space; of course, the number, direction, length and other parameters of the torsion connecting arms and cantilevers can be adjusted.

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

[0017] In a further solution, the damping layers arranged in a periodic array are an integrated structure. That is, the damping layers arranged in a periodic array are an integrated structure, and then the supporting structure units are arranged in an array on the damping layers in sequence; of course, a single damping layer can also be used as a separate integrated structure, that is, the frame, cantilever, torsion arm are an integrated structure, etc., and costs can be saved through a number of selective integrated processing.

[0018] In a further solution, 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 structure unit adopts a flexible material, the supporting structure unit is composed of several thin layers; both ends of the several thin layers are respectively connected to the damping layer and the base structure through an adhesive layer. In this solution, the supporting structure unit adopts a flexible material preferably adapted to a single damping layer, such as a rubber thin layer as the supporting structure unit; the supporting structure unit is connected to the damping layer through the inner adhesive layer, and a pre-set adhesive layer that can be pasted to the surface of the base structure and a protective film layer are provided. The film layer is used to protect the outer adhesive layer and is peeled off when the grid-like damping structure is used. The film layer can be prepared using plastic paper or the like. This design is adopted because, firstly, the damping layer and the supporting structure unit both have good deformation capabilities. Even if the bottom surface of the supporting structure unit is a plane, when it is used for a shell with a certain curvature, it can still achieve good fit without separately preparing a supporting structure unit with a curved bottom surface, which has better structural adaptability; secondly, the overall structure is very small in the thickness direction and occupies less space.

[0020] As an optional solution, when the supporting structure unit is made of hard material, the supporting structure unit is a plurality of connecting columns, one end of each of the connecting columns is detachably connected to the damping layer, and the other ends of each of the connecting columns are connected to the base structure through an adhesive layer. In this solution, a hard material column is used as the supporting structure unit, such as a connecting column; the supporting structure unit can be connected to the damping layer through an adhesive layer, or directly connected through a tight fit between the two, such as opening a plurality of jacks on the damping layer to achieve a detachable manner such as plugging through a connecting column; and the supporting structure unit can also be connected to the base structure through an adhesive layer. With this design, firstly, the supporting structure unit is longer, thereby lengthening the force arm between the damping layer and the base structure, and correspondingly a larger reaction torque can be applied, so that the vibration of the base is more effectively suppressed; secondly, the longer force arm can also amplify the excitation amplitude of the grid-shaped damping layer, causing a larger tensile / shear deformation of the damping layer, and improving the damping dissipation effect.

[0021] In order 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 layers of the damping layer, in which a plurality of the damping layers are arranged in sequence and spaced apart, and adjacent damping layers are connected by the supporting structure unit. In this solution, the structural parameters of the two damping layers can be set differently, thereby introducing richer structural modes, so that the vibration of the base structure can be more effectively suppressed.

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

[0024] 1. The present invention provides a multi-mode, multi-degree-of-freedom grid-like 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. Furthermore, it produces significant improvement effects such as multi-mode, multi-degree-of-freedom dynamic vibration absorption, efficient regulation of local resonant elastic waves, and amplification of tension, compression / shear deformation damping effects, which can significantly improve the low-frequency vibration and noise reduction effects of thin-walled structures such as plates and shells.

[0025] 2. The present invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system. Through the design of end amplified cantilevers with different structural parameters, the design of connecting arms with different structural shapes, the effective design of vibrations of different modes of each structure, and the elastic modulus of the damping layer's own material is usually much smaller than that of metal materials, and combined with reasonable structural parameter settings, a grid-like damping structural 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.

[0026] 3. The present invention provides a multi-mode, multi-degree-of-freedom grid-effect amplified damping vibration reduction system, which realizes the connection between the grid-shaped damping layer and the base structure to be damped through the supporting structure unit, thereby transmitting the effects of vibration and force, but separates the damping layer and the base structure to reduce the constraints on the damping layer so that it can produce sufficient vibration and deformation; the torsional connecting arm and cantilever of the damping layer are separated from the base structure to ensure that it can produce rich local structural resonance, thereby achieving a significant amplification effect of the reaction force applied to the base structure and the energy dissipation inside the damping structure.

[0027] 4. The present invention provides a multi-mode, multi-degree-of-freedom grid-like effect amplified damping vibration reduction system. The vibration reduction system is formed by periodic array extension in space, and the units are interconnected to form a whole, so that the vibration reduction system has a continuous distribution feature in space. In other words, it is not a number of independent small-sized concentrated units, but a piece of affixed to the installation area of ​​the vibration reduction object, and the shape can be cut according to the specific structural conditions; the self-contained adhesive layer can realize the convenient installation of the damping structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0029] Figure 1 This is a front view of the vibration reduction structure provided by the present invention (using a single damping layer, and the supporting structure unit using a thin layer);

[0030] Figure 2 The present invention provides Figure 1 Middle AA section view;

[0031] Figure 3 The present invention provides the use of Figure 1 A structural schematic diagram of a vibration reduction system formed by a vibration reduction structure in the middle;

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

[0033] Figure 5 The present invention provides the use of Figure 4 A structural schematic diagram of a vibration reduction system formed by a vibration reduction structure in the middle;

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

[0035] Figure 7 The present invention provides the use of Figure 6 A structural schematic diagram of a vibration reduction system formed by a vibration reduction structure in the middle;

[0036] Figure 8 A schematic diagram of a vibration reduction system provided by the present invention being arranged on the inner side of a base structure;

[0037] Fig. 9 This is a schematic diagram of the vibration reduction system provided by the present invention being arranged on a reinforced shell structure.

[0038] Marks and corresponding parts names in the attached drawings:

[0039] 1-damping layer, 101-cantilever, 102-torsion connecting arm, 103-installation node, 104-frame, 2-support structure unit, 3-adhesive layer, 4-membrane layer. DETAILED DESCRIPTION

[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 embodiments and drawings. The exemplary implementation modes of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0041] Embodiment 1:

[0042] This embodiment 1 provides a multi-mode multi-degree-of-freedom grid-like effect amplification damping vibration reduction system, such as Figure 1-Figure 9 As shown, including:

[0043] A plurality of vibration reduction structures, wherein the vibration reduction structures include a damping layer 1, the damping layer 1 includes a frame 104, the frame 104 includes a plurality of cantilevers 101 on the same plane and with free ends in different directions, and a plurality of torsion connecting arms 102 on the same plane and in different directions; the free ends of the cantilevers 101 are provided with mass sections; the torsion connecting arms 102 include a middle inertia section, both sides of the middle inertia section are connected to the frame 104 through fixed arms; the two fixed arms are eccentrically connected to the middle inertia section, and are respectively located on both sides of the center of the middle inertia section;

[0044] Support structure unit 2, each of the damping layers 1 is connected to the base structure via the support structure unit 2; the support structure unit 2 is used to separate the damping layer 1 from the base structure.

[0045] Compared with the prior art, the low-frequency vibration reduction effects of discrete damping, continuous damping and acoustic metamaterial plate structure designs are still relatively limited, and it is also difficult to achieve low-frequency and wide-band vibration and noise suppression. The present invention provides a multi-mode and multi-degree-of-freedom grid effect amplification damping and vibration reduction system. By adopting this solution, the needs of lightweight, low-frequency, and wide-band vibration and noise reduction of equipment plate and shell structures are met, and multi-mode and multi-degree-of-freedom structural resonance and dynamic vibration absorption design are integrated to significantly improve the medium and low-frequency vibration and noise reduction effects. In the specific structure, the vibration reduction structure includes a damping layer 1, and the damping layer 1 includes a frame 104. Inside the frame 104, a plurality of cantilevers 101 and torsion connecting arms 102 are respectively arranged, wherein the fixed end of the cantilever 101 is connected to the frame 104, and the free end is suspended, and a mass section is provided at the free end. The mass section is an end structure with a certain mass. It is preferred to adopt a cross-section enlargement structure. If an enlarged cross-section of a rectangular, circular, L-shaped or other shape is adopted to achieve better utilization of limited additional mass, the mass section can regulate the resonant frequency of the cantilever 101, and a movable end enlargement structure unit design can also be adopted; in addition, the plurality of cantilevers 101 are all in the same plane, and the free ends face different directions in the plane, so that Vibration reduction is achieved in multiple degrees of freedom directions; similarly, the torsion connecting arm 102 includes a middle inertia segment, and the fixed arms on both sides of the middle inertia segment are eccentrically connected and located on both sides of the center of the middle inertia segment. In this way, through the translational movement and rotational movement of the middle inertia segment in different directions and its coupling with the fixed arm, richer structural resonance can be obtained, and a stronger effect applied to the frame 104 can be obtained, thereby achieving a more significant vibration reduction effect in a wider low-frequency band; and several torsion connecting arms 102 are all located in the same plane and are set in different directions, so that the vibration reduction effect can be improved in multiple directions; wherein, the middle inertia segment can also adopt a cross-section enlargement structure, if a circular, rectangular, annular, etc. enlarged cross section is adopted. The damping layer 1 can be made of a polymer material with greater damping, such as rubber and plastic, and preferably has the same size in the thickness direction.

[0046] Secondly, in this solution, the damping layer 1 is connected to the base structure through the support structure unit 2, thereby transmitting the effects of vibration and force, but the damping layer 1 is separated from the base structure to reduce the constraints on the damping layer 1 so that it can produce sufficient vibration and deformation; the support structure unit 2 can be arranged in the circumferential area of ​​the frame 104 and on the mounting node 103. Among them, the support structure unit 2 can use the same material as the damping layer 1, or a harder material of a different material can be used to ensure the effective transmission of the interaction between the damping layer 1 and the base structure. In addition, although the support structure unit 2 can be prepared using materials with relatively low elastic modulus such as rubber, it is not recommended to use softer materials / structures with lower stiffness for the support structure unit 2. The main principle is to avoid its vibration isolation effect in the frequency band of interest, which reduces the effect of the grid-like damping layer 1 on the base structure. In addition, although the damping layer 1 and the support structure unit 2 are independently arranged in this solution, the two can be designed and prepared in an integrated manner.

[0047] In the above scheme, the damping layer 1 can be set on the surface of the base plate and shell structure to be used for vibration and noise reduction; when the base structure vibrates under dynamic excitation, the grid-like damping structure is caused to vibrate, and a reaction force applied to the base structure and strong energy dissipation inside the damping structure are generated; from the structural setting of the grid-like damping layer 1, it can be seen that the torsional connecting arm 102 and the cantilever 101 will vibrate in multiple modes such as longitudinal vibration, bending vibration, and torsional vibration, and correspondingly form forces and torques in different directions acting on the base structure, thereby playing a multi-mode role. / Multi-degree-of-freedom effect of suppressing base vibration; similarly, the grid-like damping layer 1 is structurally arranged to separate the torsion connecting arm 102 and the cantilever 101 from the base structure through the supporting structure unit 2 to ensure that they can generate abundant local structural resonances, thereby achieving a significant amplification effect of the reaction force applied to the base structure and the energy dissipation inside the damping structure; the torsion connecting arm 102 and the cantilever 101 will resonate with different vibration modes and their coupling modes, thereby significantly enhancing the reaction force / torque applied to the base structure. Moreover, 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 1 will also be greatly improved; and 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 of different modes of each structure, and the elastic modulus of the damping layer 1 material itself is usually much smaller than that of metal material, combined with reasonable structural parameter settings, a grid-like damping structural 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 of the damping layers 1 are closely connected in sequence and arranged in a periodic array; several of the supporting structure units 2 are arranged in a periodic array on the damping layers 1. In this solution, several of the damping layers 1 are closely connected in sequence and arranged in a periodic array, and several supporting structure 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 can also be used as a single period under special circumstances; the vibration reduction system is formed by extending the periodic array in space, and the units are connected to each other to form a whole, so that the vibration reduction system has a continuous distribution feature in space. In other words, it is not a number of independent small-sized concentrated units, but a piece of affixed to the installation area of ​​the vibration reduction object, and can be cut into shape according to the specific structural conditions; the damping structure can be conveniently installed by the self-contained adhesive layer 3 or other connection methods. The vibration reduction system has design effects such as multi-mode action, multi-degree-of-freedom structural resonance, high structural resonance frequency distribution density, and spatial distribution continuity. Furthermore, it produces significant improvements such as multi-mode and multi-degree-of-freedom dynamic vibration absorption, efficient regulation of local resonant elastic waves, and amplification of tension, compression / shear deformation damping effects. It can significantly improve the low-frequency vibration and noise reduction effects in thin-walled structures such as plates and shells.

[0049] In this embodiment, in order to adjust the resonant frequency of the cantilever 101 and adapt to the vibration in each frequency band, the lengths of the cantilevers 101 are all different. In this solution, the length of each cantilever 101 is optional and different; in addition, the mass and cross-sectional profile of the mass section on the free end of the cantilever 101 are both optional, so that through selective combination control, each cantilever 101 can be adapted to the vibration in each frequency band, so as to broaden the frequency band range under the vibration reduction effect.

[0050] As an optional solution, the plurality of torsion connecting arms 102 are respectively arranged at different inner side positions of the frame 104 ; the plurality of cantilevers 101 are located in a space enclosed by the plurality of torsion connecting arms 102 and the inner side of the frame 104 . In the present solution, two torsion connecting arms 102 can be provided, and the two torsion connecting arms 102 are adjacent to each other and are respectively provided at the two inner side edges of the frame 104, and are respectively parallel to the two inner side edges, so that the additional effect caused by the multi-mode and multi-degree-of-freedom vibration of the torsion arm acting on the base structure in the lateral and vertical directions can be realized; a plurality of cantilevers 101 are provided in the remaining space of the frame 104, and the cantilevers 101 can be provided. Four cantilevers 101 are orthogonally distributed and have different lengths, so that the additional effects caused by the longitudinal vibration and torsional vibration along the axis of the cantilever 101 with different resonant frequencies and different action directions, as well as the lateral vibration / bending vibration and torsional vibration in two directions perpendicular to the axis of the cantilever 101 can be realized; the above design can further achieve the effect of saving space; of course, the setting quantity, direction, length and other parameters of the torsion connecting arms 102 and the cantilevers 101 can be adjusted.

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

[0052] In a further solution, the damping layers 1 arranged in a periodic array are an integrated structure. That is, the damping layers 1 arranged in a periodic array are an integrated structure, and then the support structure units 2 are sequentially arranged in an array on the damping layers 1; of course, a single damping layer 1 can also be a separate integrated structure, that is, the frame 104, the cantilever 101, the torsion arm are an integrated structure, etc., and costs can be saved through a number of selective integrated processing.

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

[0054] Embodiment 2:

[0055] This embodiment 2 is further optimized on the basis of embodiment 1, such as Figure 1-Figure 7 As shown, a variety of configuration modes of the supporting structure unit 2 are provided.

[0056] As an optional solution, when the support structure unit 2 is made of flexible material, the support structure unit 2 is composed of several thin layers; both ends of the several thin layers are respectively connected to the damping layer 1 and the base structure through the adhesive layer 3. In this solution, the support structure unit 2 is made of flexible material and preferably adapts to a single damping layer 1, such as a rubber thin layer as the support structure unit 2; the support structure unit 2 is connected to the damping layer 1 through the inner adhesive layer 3, and is preset with an adhesive layer 3 that can be pasted to the surface of the base structure and a protective film layer 4, the film layer 4 is used to protect the outer adhesive layer 3, and is peeled off when the grid-like damping structure is used, and the film layer 4 can be prepared using plastic paper or the like. This design is adopted because, firstly, the damping layer 1 and the support structure unit 2 both have good deformation ability, even if the bottom surface of the support structure unit 2 is a plane, when it is used for a shell with a certain curvature, it can still achieve good fit without separately preparing a support structure unit 2 with a curved bottom surface, which has better structural adaptability; secondly, the overall structure is very small in thickness direction and occupies less space.

[0057] As an optional solution, when the support structure unit 2 is made of hard material, the support structure unit 2 is a plurality of connecting columns, one end of each of the connecting columns is detachably connected to the damping layer 1, and the other end of each of the connecting columns is connected to the base structure through an adhesive layer 3. In this solution, a hard material column is used as the support structure unit 2, such as a connecting column; the support structure unit 2 can be connected to the damping layer 1 through an adhesive layer 3, or can be directly connected through a tight fit between the two, such as opening a plurality of jacks on the damping layer 1 to achieve a detachable manner such as plugging through a connecting column; and the support structure unit 2 can also be connected to the base structure through an adhesive layer 3. With this design, firstly, the support structure unit 2 is longer, so that the force arm between the damping layer 1 and the base structure becomes longer, and a larger reaction torque can be applied accordingly, so that the vibration of the base is more effectively suppressed; secondly, the longer force arm can also play a role in amplifying the excitation amplitude of the grid-shaped damping layer 1, causing a larger tensile / shear deformation of the damping layer 1, and improving the damping dissipation effect.

[0058] In order 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] Embodiment 3:

[0060] This embodiment 3 is further optimized on the basis of embodiment 1 or embodiment 2, such as Figure 6 and Figure 7 As shown, a configuration mode of a multi-layer damping layer 1 of a vibration-damping structure is provided.

[0061] As an optional solution, the vibration reduction structure includes at least two layers of the damping layers 1. In the vibration reduction structure, a plurality of the damping layers 1 are arranged in sequence and spaced apart, and adjacent damping layers 1 are connected by the supporting structure unit 2. In this solution, the structural parameters of the two damping layers 1 can be set differently, thereby introducing richer structural modes, so that the vibration of the base structure can be more effectively suppressed.

[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 and multi-degree-of-freedom grid-like effect amplification damping vibration reduction system, characterized in that: include: A plurality of vibration reduction structures, the vibration reduction structures comprising a damping layer (1), the damping layer (1) comprising a frame (104), the frame (104) comprising a plurality of cantilevers (101) on the same plane and with free ends in different directions, and a plurality of torsion connection arms (102) on the same plane and in different directions; the free ends of the cantilevers (101) are provided with mass sections; the torsion connection arms (102) comprise a middle inertia section, both sides of the middle inertia section are connected to the frame via fixed arms; the two fixed arms are eccentrically connected to the middle inertia section and are respectively located on both sides of the center of the middle inertia section; A supporting structure unit (2), each of the damping layers (1) is connected to the base structure via the supporting structure unit (2); the supporting structure unit (2) is used to separate the damping layer (1) from the base structure.

2. The multi-mode multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 1, characterized in that: The plurality of damping layers (1) are sequentially and compactly connected and arranged in a periodic array; and the plurality of supporting structure units (2) are arranged in a periodic array on the plurality of 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 plurality of cantilevers (101) are 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 connection arms (102) are respectively arranged at different inner side edge positions of the frame (104); and the plurality of cantilevers (101) are located in a space enclosed by the plurality of torsion connection arms (102) and the inner side edge 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 side of the frame (104) corresponding to the torsion connection arm (102) is open; a mounting node (103) is provided between two adjacent torsion connection arms (102), and both are connected via a fixed arm and the mounting node (103).

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

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 flexible material, the supporting structure unit (2) is composed of several thin layers; Both ends of the plurality of thin layers are respectively connected to the damping layer (1) and the base structure via 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 a hard material, the support structure unit (2) is a plurality of connection columns, one end of each of the connection columns is detachably connected to the damping layer (1), and the other ends of each of the connection columns are connected to the base structure via 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. The multi-mode multi-degree-of-freedom grid-effect amplified damping vibration reduction system according to claim 6, characterized in that: The vibration reduction structure comprises at least two damping layers (1). In the vibration reduction structure, a plurality of damping layers (1) are arranged in sequence and at intervals, and adjacent damping layers (1) are connected via the supporting structure unit (2).

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