High-reliability low-frequency broadband coupling damping vibration absorber

Abstract

The invention relates to a high-reliability low-frequency broadband coupling damping vibration absorber which comprises an outer shell and an oscillator system arranged in the outer shell. The oscillator system comprises two oscillator units with different resonant frequencies; the two oscillator units are connected in an inner and outer nesting manner; each vibrator unit comprises a three-dimensional mass block, flexible side edge connecting pieces arranged on the two opposite sides of the three-dimensional mass block respectively, and a spring connecting structure arranged at the bottom of the three-dimensional mass block. In the vibrator system, the vibrator unit located on the outer side is connected with the side wall of the outer shell based on a flexible side edge connecting piece, and the vibrator units arranged inside and outside in a sleeved mode are connected based on the flexible side edge connecting piece of the vibrator unit on the inner side. The two vibrator units are respectively connected with the bottom of the outer shell based on the spring connecting structures. The low-frequency vibration absorption effect is enhanced through coupling of the inner vibrator unit and the outer vibrator unit, the high-frequency vibration absorption effect is considered, and the vibration absorber is compact in structure and high in reliability, impact resistance and creep resistance.

Description

Technical Field

[0001] The invention relates to the field of vibration and noise control, and in particular to a high-reliability low-frequency broadband coupled damping vibration absorber. Background Art

[0002] Structural vibration and noise are widely present in the field of mechanical engineering. Vibration and noise not only directly affect the performance of mechanical devices, but also lead to serious accidents such as loss of control, structural fatigue damage, fracture, explosion and disintegration. Designing materials and structures with vibration suppression characteristics and using them in mechanical equipment structural design is of great significance to improving the overall performance of equipment, enhancing the safety of equipment and extending its service life. Properly designed damping and vibration absorbers are important means to reduce structural vibration.

[0003] The damping effect can effectively reduce the vibration of the structure, which is divided into structural damping and dampers. The structural damping effect depends on the material itself. The damping coefficient of most metal materials is weak. Rubber has a high damping coefficient but a low storage modulus. It is usually only effective at high frequencies and has a weak effect at low frequencies. Dampers are usually used in large-stroke deformation and impact-resistant structures, such as automobile suspensions, bridges and building earthquake resistance, etc. It is difficult to install a large number of complex equipment components to reduce low-frequency broadband vibrations.

[0004] Vibration absorbers are important vibration reduction measures. Undamped frequency-modulated vibration absorbers have excellent effects at vibration absorption frequencies, but their bandwidth is very narrow, and a large additional mass ratio is required to increase the bandwidth. Damped vibration absorbers can effectively control broadband vibration peaks. The "rubber plus mass block" form can be used to design damped vibration absorbers that do not rely on fluid damping, and have a compact structure and high reliability. However, although this type of damped vibration absorber is very mature in theory, there are few practical structures in engineering. The design of low-frequency vibration absorbers for engineering use has the following difficulties: (1) The contradiction between low frequency and impact resistance and creep resistance: The static modulus of rubber is usually only 1 / 5-1 / 8 of the dynamic modulus. The static deformation of rubber vibration absorbers with a frequency below 30Hz is large, and the impact resistance is weak. After a short period of use, it will produce sedimentation and creep, resulting in failure of the vibration absorber. Therefore, it is difficult to reconcile the contradiction between low frequency and impact resistance and creep resistance.

[0005] (2) Difficult to broadbandize: Although the frequency band of the vibration absorber on the system vibration peak becomes wider after increasing the damping, it is only effective near the resonance frequency of the vibration absorber. The total bandwidth is still relatively narrow, and the lower the frequency, the narrower the bandwidth.

[0006] (3) Difficulty in adjusting the damping effect: The damping effect of the vibration absorber designed in the form of "rubber plus mass block" depends entirely on the loss factor of the rubber material itself. The damping effect at a specific frequency is usually large and difficult to adjust. However, in practice, excessive damping will cause the vibration control effect of the vibration absorber at the non-modal peak of the system to weaken or disappear, and it is necessary to find an appropriate damping-frequency coordinated adjustment method.

[0007] (4) Multi-directional effects are difficult to expand: Traditional vibration absorbers can only produce unidirectional vibration suppression, and the multi-directional vibration suppression effect is weak. Summary of the invention

[0008] The object of the present invention is to provide a high-reliability low-frequency broadband coupled damping vibration absorber.

[0009] To achieve the above-mentioned object of the invention, the present invention provides a highly reliable low-frequency broadband coupled damping vibration absorber, comprising: an outer shell, and an oscillator system arranged in the outer shell; The vibrator system includes two vibrator units with different resonance frequencies; The two vibrator units are connected in an inner-outer nested manner; The vibrator unit comprises: a three-dimensional mass block, flexible side connectors respectively arranged on two opposite sides of the three-dimensional mass block, and a spring connection structure arranged at the bottom of the three-dimensional mass block; In the vibrator system, the vibrator unit on the outside is connected to the side wall of the outer shell based on the flexible side connector, and the vibrator units arranged inside and outside are connected based on the flexible side connector of the inner vibrator unit; The two vibrator units are respectively connected to the bottom of the outer shell based on the spring connection structure.

[0010] According to one aspect of the present invention, in the vibrator system, the flexible side connectors of the vibrator units arranged inside and outside are arranged in a cross direction. According to one aspect of the present invention, the flexible side connector comprises: a first connecting steel plate, an interlayer elastic block, and a second connecting steel plate; The interlayer elastic block is arranged between the first connecting steel plate and the second connecting steel plate; The opposite ends of the interlayer elastic block are fixedly connected to the first connecting steel plate and the second connecting steel plate respectively.

[0011] According to one aspect of the present invention, the sandwich elastic block is made of a viscoelastic elastic material having a damping coefficient greater than 0.05 and less than 0.5; The interlayer elastic block is fixed to the first connecting steel plate and the second connecting steel plate by vulcanization connection.

[0012] According to one aspect of the present invention, the spring connection structure comprises: a first end steel plate, a compression spring, and a second end steel plate; The compression spring is disposed between the first end steel plate and the second end steel plate; The opposite ends of the compression spring are fixedly connected to the first end steel plate and the second end steel plate respectively.

[0013] According to one aspect of the present invention, in the vibrator system, the three-dimensional mass block of the vibrator unit at the inner side is a solid cylinder, and the three-dimensional mass block of the vibrator unit at the outer side is a hollow cylinder; In the vibrator system, the spring connection structure of the inner vibrator unit is arranged in the middle of the bottom of the three-dimensional mass block, and a connection cavity for installing and accommodating the upper end of the spring connection structure is arranged in the middle of the bottom of the three-dimensional mass block to reduce the structural size; In the vibrator system, a plurality of the spring connection structures are evenly arranged at the bottom of the three-dimensional mass block of the outer vibrator unit, and a connection cavity for installing and accommodating the upper end of the spring connection structure is provided at the bottom of the three-dimensional mass block to reduce the structural size.

[0014] According to one aspect of the present invention, the outer shell comprises: a bottom plate, a plurality of supporting side plates, and a top plate; In the vibrator system, the flexible side connectors of the vibrator units on the outside are connected to the supporting side plates, and all the spring connection structures are respectively connected to the bottom plate.

[0015] According to one aspect of the present invention, the vibrator system has two translational modes and at least one rotational mode in each of the three-dimensional directions; The frequency ratio between the two translational modes is between 1.5 and 3 times.

[0016] According to one aspect of the present invention, the modal frequency of the vibrator system in the three-dimensional direction is adjusted by changing the first characteristic parameter of the flexible side connection member and / or by changing the second characteristic parameter of the spring connection structure; The first characteristic parameter is at least one of the hardness, shape, and material of the interlayer elastic block; The second characteristic parameter is at least one of the size, material, spring constant, and number of turns of the compression spring.

[0017] According to one aspect of the present invention, the engineering damping ratio of the low-frequency broadband coupled damping vibration absorber is adjusted based on the stiffness ratio of the dynamic stiffness of the sandwich elastic block to the total dynamic stiffness of the low-frequency broadband coupled damping vibration absorber, wherein the total dynamic stiffness of the low-frequency broadband coupled damping vibration absorber is the sum of the dynamic stiffness of the sandwich elastic block and the dynamic stiffness of the compression spring; If the stiffness ratio decreases, the engineering damping ratio decreases, wherein the stiffness ratio is reduced based on reducing the dynamic stiffness of the sandwich elastic block or increasing the dynamic stiffness of the compression spring.

[0018] According to one scheme of the present invention, in the low-frequency broadband coupled damping vibration absorber designed by the present invention, the three-dimensional mass block in the outer layer is connected to the outer shell through a flexible side connector to form a local resonance vibrator; by controlling the shape, hardness, etc. of the sandwich elastic block in the flexible side connector, a vibrator with different resonance frequencies can be obtained, and the three-dimensional mass block in the inner layer and the three-dimensional mass block in the outer layer are also connected through a flexible side connector, so that the inner and outer layer vibrator units are coupled to achieve an excellent vibration absorption effect.

[0019] According to one solution of the present invention, the low-frequency broadband coupled damping vibration absorber provided by the present invention utilizes the shear strain of the flexible side connector to maximize its damping effect and broaden the vibration reduction frequency band of the low-frequency broadband coupled damping vibration absorber.

[0020] According to one solution of the present invention, the low-frequency broadband coupled damping vibration absorbers of the present invention are periodically arranged and installed on a base structure that needs vibration reduction, so that the vibration of the base structure can be effectively controlled.

[0021] According to one solution of the present invention, the shear stiffness and deformation of the interlayer elastic block can be flexibly adjusted by setting the interlayer elastic block as a solid structure or a hollow structure. In particular, the shear stiffness and deformation of the interlayer elastic block can be adjusted more diversely by setting the interlayer elastic block as a hollow structure, and the adjustment method can be more flexible by flexibly setting the setting form and setting position of the hollow part (such as the middle, coaxial arrangement, offset arrangement, etc.).

[0022] According to one solution of the present invention, the present invention effectively ensures the manufacturing convenience, connection strength and stability between components through the provided spring connection structure, and at the same time, effectively avoids the influence on the internal shear strain of the flexible side connector, which is beneficial to ensuring the vibration reduction effect of the present invention.

[0023] According to one solution of the present invention, the low-frequency broadband coupled damping vibration absorber of the present invention has multiple resonance modes in all directions, so that the present invention has the ability of multi-directional vibration absorption.

[0024] According to one solution of the present invention, the present invention can broaden the vibration reduction frequency band by designing vibrator units with different resonance frequencies in the vibrator system and coupling them through high damping materials, and at the same time, can also make greater use of the damping effect of the material.

[0025] According to one scheme of the present invention, the vibration absorber of the present invention contains two vibration absorbing masses, and the vibration absorbing masses are coupled through shear damping, and the external mass block and the side wall of the outer shell are also coupled through shear damping. The coupling of the two vibration absorbing masses enables the entire vibration absorber to produce more than 6-9 low-frequency multi-directional vibration absorbing modes, expanding the vibration reduction bandwidth and effect. At the same time, an embedded spring connection is designed between the bottom of the vibration absorbing mass block and the outer shell to prevent the vibration absorber from failing due to rubber creep and large static deformation. By adjusting the proportion of the rubber shear contribution stiffness to the total stiffness, the overall damping ratio of the vibration absorber at a specific frequency can be linearly adjusted. The entire vibration absorber has a compact structure, and the core components are assembled in modules, which greatly reduces the processing and manufacturing costs when used in large quantities.

[0026] According to one solution of the present invention, the present invention has a compact structure, high reliability, good manufacturing process, takes both low frequency and broadband into consideration, and is easy to manufacture and install, thus solving the problem that existing vibration absorbers are difficult to use in practice due to various shortcomings.

[0027] According to one solution of the present invention, the present invention enhances the low-frequency vibration absorption effect and takes into account the high-frequency vibration absorption effect through the coupling of internal and external vibrator units. The vibration absorber has a compact structure and high reliability, impact resistance and creep resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a perspective view schematically showing a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention; Figure 2 is an exploded view schematically showing a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention; Figure 3 is a cross-sectional view schematically showing a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention; Figure 4 is a longitudinal sectional view schematically showing a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention; Figure 5 is a structural diagram schematically showing a flexible side connector according to an embodiment of the present invention; Figure 6 is a structural diagram schematically showing a spring connection structure according to an embodiment of the present invention; Figure 7 is a bottom view schematically showing a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention; Figure 8It is a schematic representation Figure 7 Cross-sectional view at the AA position; Fig. 9 Schematically represents a translational modal diagram of a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention, wherein (a) represents a translational modal diagram of the low-frequency broadband coupled damping vibration absorber along the Z axis, (b) represents a translational modal diagram of the low-frequency broadband coupled damping vibration absorber along the Y axis, and (c) represents a translational modal diagram of the low-frequency broadband coupled damping vibration absorber along the X axis; Fig.10 Schematically represents a rotational mode diagram of a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention, wherein (a) represents a rotational mode diagram of the low-frequency broadband coupled damping vibration absorber along the Y axis, (b) represents a rotational mode diagram of the low-frequency broadband coupled damping vibration absorber along the Z axis, and (c) represents a rotational mode diagram of the low-frequency broadband coupled damping vibration absorber along the X axis; Fig.11 Schematically represents the vibration spectrum of a low-frequency broadband coupled damping vibration absorber under X, Y, and Z translational excitation according to an embodiment of the present invention; Fig.12 is a model diagram schematically showing a low-frequency broadband coupled damping vibration absorber installed on a floating beam in Example 1 according to an embodiment of the present invention; Fig.13 is a diagram schematically showing the vibration attenuation characteristics of a floating beam by a low-frequency broadband coupled damping vibration absorber in Example 1 according to an embodiment of the present invention; Fig.14 is a diagram schematically showing the vibration attenuation characteristics of a floating beam by a low-frequency broadband coupled damping vibration absorber in Example 2 according to an embodiment of the present invention; Fig.15 The diagram schematically shows the damping adjustment of a low-frequency broadband coupled damping vibration absorber according to an embodiment of the present invention, wherein (a) shows the relationship between the vibration transmission rate of the low-frequency broadband coupled damping vibration absorber and the ratio of the stiffness provided by the interlayer elastic block to the total stiffness, and (b) shows the relationship between the damping ratio of the low-frequency broadband coupled damping vibration absorber and the ratio of the stiffness provided by the interlayer elastic block to the total stiffness. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0032] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, a high-reliability low-frequency broadband coupled damping vibration absorber of the present invention comprises: an outer shell 1, and a vibrator system 2 arranged in the outer shell 1; wherein the vibrator system 2 comprises two vibrator units 21 with different resonance frequencies; in this embodiment, the vibrator system 2 is enclosed in the outer shell 1, and the two vibrator units 21 are connected in an inside-outside nested manner; wherein the vibrator unit 21 comprises: a three-dimensional mass block 211, flexible side connectors 212 respectively arranged on opposite sides of the three-dimensional mass block 211, and a spring connection structure 213 arranged at the bottom of the three-dimensional mass block 211; in this embodiment, the three-dimensional mass block 211 is a rigid structural member. Furthermore, in the vibrator system 2, the vibrator unit 21 on the outside is connected to the side wall of the outer shell 1 based on the flexible side connector 212, and the vibrator units 21 arranged inside and outside are connected based on the flexible side connector 212 of the inner vibrator unit 21; in this embodiment, the outer shell 1 is a rectangular hollow shell as a whole, so that the vibrator unit 21 on the outside can be connected to the two opposite side walls of the outer shell 1, wherein the vibrator unit 21 can be fixed to the outer shell 1 by threaded connection, so as to achieve reliable and flexible installation. Furthermore, the two vibrator units 21 are respectively connected to the bottom of the outer shell 1 based on the spring connection structure 213, so that there is corresponding elastic support in the vertical direction.

[0033] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, according to an embodiment of the present invention, in the vibrator system 2, the arrangement directions of the flexible side connectors 212 of the inner and outer vibrator units 21 are cross-arranged; specifically, the angle between the arrangement directions of the flexible side connectors 212 of the inner and outer vibrator units 21 is a right angle, thereby achieving a circumferentially staggered and regularly (such as uniformly distributed) arrangement of the flexible side connectors 212 of the inner and outer vibrator units 21, which helps to stabilize and facilitate the installation of different vibrator units 21, and also enables the entire vibrator system 2 to exhibit different resonance modes in different directions, effectively optimizing and improving the vibration absorption effect of the present invention.

[0034] Combination Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, according to one embodiment of the present invention, the flexible side connector 212 includes: a first connecting steel plate 212a, a sandwich elastic block 212b and a second connecting steel plate 212c; wherein the sandwich elastic block 212b is arranged between the first connecting steel plate 212a and the second connecting steel plate 212c; in this embodiment, the opposite ends of the sandwich elastic block 212b are respectively fixedly connected to the first connecting steel plate 212a and the second connecting steel plate 212c. Specifically, the sandwich elastic block 212b can be fixed to the first connecting steel plate 212a and the second connecting steel plate 212c by gluing, vulcanization or the like. In this embodiment, the interlayer elastic block 212b can be set to a regular block structure (such as a rectangular block, a cylindrical block, etc.), so that an interlocking groove or an interlocking protrusion can be respectively set on the side of the first connecting steel plate 212a and the second connecting steel plate 212c to achieve a coordinated installation with the interlayer elastic block 212b, so as to further improve the reliability and stability of the fixed connection position and effectively prevent the deformation and falling off of the interlayer elastic block 212b.

[0035] In this embodiment, the first connecting steel plate 212a and the second connecting steel plate 212c are respectively set as rectangular plates, thereby, a fixed connection with an adjacent structure can be achieved by a threaded connector. Among them, the sizes of the first connecting steel plate 212a and the second connecting steel plate 212c are different, wherein the size of the first connecting steel plate 212a is larger than the size of the second connecting steel plate 212c, and then, in the flexible side connector 212 of the vibrator unit 21 on the outside, the first connecting steel plate 212a is connected to the outer three-dimensional mass block 211, and the second connecting steel plate 212c is connected to the side wall of the outer shell 1; further, in order to effectively reduce the space occupied by the flexible side connector 212 at the connection position, a connecting steel plate installation cavity can be set on the outer wall of the outer three-dimensional mass block 211, thereby, the first connecting steel plate 212a can be installed at the bottom of the connecting steel plate installation cavity, and part of the interlayer elastic block 212b is in the connecting steel plate installation cavity. In this embodiment, in order to ensure that the three-dimensional mass block 211 in the outer vibrator unit 21 has sufficient space for movement, the depth of the connecting steel plate installation cavity can be set to achieve accurate arrangement of the position of the three-dimensional mass block 211.

[0036] Furthermore, in the flexible side connector 212 of the inner vibrator unit 21, the first connecting steel plate 212a is connected to the inner three-dimensional mass block 211, and the second connecting steel plate 212c is connected to the side wall of the outer three-dimensional mass block 211; further, in order to effectively reduce the space occupied by the flexible side connector 212 at the connection position, a connecting steel plate installation cavity can be set on the outer wall of the inner three-dimensional mass block 211, thereby, the first connecting steel plate 212a can be installed at the bottom of the connecting steel plate installation cavity, and part of the interlayer elastic block 212b is in the connecting steel plate installation cavity. In this embodiment, in order to ensure that the three-dimensional mass block 211 in the inner vibrator unit 21 has sufficient space for movement, the depth of the connecting steel plate installation cavity can be set to achieve accurate arrangement of the position of the three-dimensional mass block 211.

[0037] In this embodiment, four threaded connection member installation positions are respectively provided on the first connection steel plate 212a and the second connection steel plate 212c to achieve reliable and stable installation.

[0038] Combination Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, according to one embodiment of the present invention, the interlayer elastic block 212b can be set as a solid block or a hollow block. When the interlayer elastic block 212b is set as a hollow block, the hollow portion can penetrate the opposite ends of the interlayer elastic block 212b, wherein the two ends of the interlayer elastic block 212b with openings are respectively connected to the first connecting steel plate 212a and the second connecting steel plate 212c. Of course, in another embodiment, the two ends of the interlayer elastic block 212b with openings may not be connected to the first connecting steel plate 212a and the second connecting steel plate 212c. In another embodiment, when the interlayer elastic block 212b is set as a hollow block, the hollow portion may not penetrate the opposite ends of the interlayer elastic block 212b, so that the interlayer elastic block 212b is a closed hollow structure.

[0039] Of course, in another embodiment, when the interlayer elastic block 212b is configured as a hollow block, the hollow portion may be configured as an integral hollow space, or a grid-dividing method may be used to form regularly distributed grid hollow portions.

[0040] Through the above-mentioned settings, by setting the interlayer elastic block 212b as a solid structure or a hollow structure, the shear stiffness and deformation of the interlayer elastic block 212b can be flexibly adjusted. In particular, by setting the interlayer elastic block 212b as a hollow structure, the adjustment of its shear stiffness and deformation can be more diverse, and the adjustment method can be more flexible by flexibly setting the setting form and setting position of the hollow part (such as the middle, coaxial arrangement, offset arrangement, etc.).

[0041] Combination Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, according to an embodiment of the present invention, the sandwich elastic block 212b is made of a viscoelastic elastic material with a damping coefficient greater than 0.05 and less than 0.5. By setting the damping coefficient of the sandwich elastic block 212b within the above range, the vibration absorption effect of the flexible side connector 212 is fully guaranteed, which is more beneficial to ensuring the structural reliability and stability of the vibration absorption process. If the damping coefficient is too small, it is easy to cause the flexible side connector 212 to have poor creep resistance and fail. If the damping coefficient is too large, it is difficult for the flexible side connector 212 to have corresponding vibration absorption performance.

[0042] Preferably, the sandwich elastic block 212b is made of rubber material. Further, the sandwich elastic block 212b is integrally fixed with the first connecting steel plate 212a and the second connecting steel plate 212c by vulcanization connection, so as to achieve reliable tolerance of the connection position.

[0043] Combination Figure 2 , Figure 4 and Figure 6As shown, according to an embodiment of the present invention, the spring connection structure 213 includes: a first end steel plate 213a, a compression spring 213b and a second end steel plate 213c; wherein the compression spring 213b is arranged between the first end steel plate 213a and the second end steel plate 213c; in this embodiment, the opposite ends of the compression spring 213b are respectively fixedly connected with the first end steel plate 213a and the second end steel plate 213c, and specifically, the opposite ends of the compression spring 213b can be fixed with the first end steel plate 213a and the second end steel plate 213c by welding, bonding, etc. In this embodiment, in order to ensure the installation coaxiality of the first end steel plate 213a, the compression spring 213b and the second end steel plate 213c, they can be pre-arranged in a mutually nested manner so that they can be coaxially arranged, and then welding or bonding is used at the mutually nested position to achieve mutual fixation. In this embodiment, the first end steel plate 213a is circular or rectangular in shape as a whole, and a cylindrical protrusion is provided at one end thereof connected to the compression spring 213b, and the cylindrical protrusion is nested with the compression spring 213b to achieve a corresponding coaxial arrangement. Similarly, the second end steel plate 213c is circular or rectangular in shape as a whole, and a cylindrical protrusion is provided at one end thereof connected to the compression spring 213b, and the cylindrical protrusion is nested with the compression spring 213b to achieve a corresponding coaxial arrangement. Accordingly, a connection hole is provided at the middle position of the first end steel plate 213a, or a plurality of connection holes are provided at equal intervals on the first end steel plate 213a at positions different from the cylindrical protrusion, thereby achieving a fixed connection with the bottom of the three-dimensional mass block 211 by passing through the connection hole through a threaded connector, and accordingly, a connection hole is provided at the middle position of the second end steel plate 213c, or a plurality of connection holes are provided at equal intervals on the second end steel plate 213c at positions different from the cylindrical protrusion, thereby achieving a fixed connection with the bottom of the outer shell 1 by passing through the connection hole through a threaded connector.

[0044] Through the above-mentioned arrangement, the present invention effectively ensures the manufacturing convenience, connection strength and stability between the components through the spring connection structure 213, and at the same time, effectively avoids the influence on the internal shear strain of the flexible side connector 212, which is beneficial to ensuring the vibration reduction effect of the present invention.

[0045] Combination Figure 2 , Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, in the vibrator system 2, the three-dimensional mass block 211 of the vibrator unit 21 on the inner side is a solid cylinder, and the three-dimensional mass block 211 of the vibrator unit 21 on the outer side is a hollow cylinder; specifically, the three-dimensional mass block 211 of the vibrator unit 21 on the inner side can be set as a rectangular parallelepiped ( Figure 1 ), a cylinder or a prism, the three-dimensional mass block 211 of the vibrator unit 21 on the outside can be set as a rectangular cylinder ( Figure 1), cylindrical or prismatic cylinder.

[0046] In this embodiment, in the vibrator system 2, the spring connection structure 213 of the vibrator unit 21 on the inner side is provided with one, and it is arranged in the middle of the bottom of the three-dimensional mass block 211, and a connection cavity 211a for installing and accommodating the upper end of the spring connection structure 213 is provided in the middle of the bottom of the three-dimensional mass block 211, so as to reduce the structural size; in this embodiment, the diameter of the connection cavity 211a is matched with the outer diameter of the first end steel plate 213a of the spring connection structure 213, so as to ensure reliable and stable installation. Further, in the vibrator system 2, a plurality of spring connection structures 213 are evenly arranged at the bottom of the three-dimensional mass block 211 of the vibrator unit 21 on the outer side, and a connection cavity 211a for installing and accommodating the upper end of the spring connection structure 213 is provided at the bottom of the three-dimensional mass block 211, so as to reduce the structural size; similarly, the diameter of the connection cavity 211a at the bottom of the three-dimensional mass block 211 on the outer side is matched with the outer diameter of the first end steel plate 213a of the spring connection structure 213, so as to ensure reliable and stable installation.

[0047] In this embodiment, since the outer three-dimensional mass block 211 is a cylindrical structure, in order to ensure the stability and reliability of its support, a plurality of corresponding spring connection structures 213 can be set to achieve stable support for the outer three-dimensional mass block 211; for example, when the outer three-dimensional mass block 211 is set as a rectangular cylinder, the corresponding spring connection structure 213 can be set to four, and each spring connection structure 213 is arranged in the middle position of the bottom side of the outer three-dimensional mass block 211 to achieve corresponding regular arrangement and stable support. In addition, since the bottom shapes and sizes of the inner and outer three-dimensional mass blocks 211 are different, the radial sizes of the corresponding spring connection structures 213 are also different, so as to achieve the effect of matching the spring connection structure 213 with the three-dimensional mass block 211.

[0048] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, the outer shell 1 includes: a bottom plate 11, a plurality of supporting side plates 12, and a top plate 13; wherein the plurality of supporting side plates 12 are arranged in sequence to form a space for accommodating the vibrator system 2, and the opposite ends of the supporting side plates 12 are detachably connected to the bottom plate 11 and the top plate 13 respectively; in this embodiment, in the vibrator system 2, the flexible side connector 212 of the vibrator unit 21 on the outside is connected to the inner side of the corresponding supporting side plate 12; in the vibrator system 2, the spring connection structure 213 of all the vibrator units 21 are respectively connected to the bottom plate 11.

[0049] In this embodiment, the top plate 13 and the bottom plate 11 are respectively set as rectangular plates, and a plurality of supporting side plates 12 can constitute a rectangular cylinder, wherein the opposite ends are respectively connected to the top plate 13 and the bottom plate 11 by threaded connection; specifically, the annular support 12 has four mutually vertically connected load-bearing plate bodies, wherein the upper and lower ends of each load-bearing plate body are respectively connected by threaded connectors to achieve vertical connection with the top plate 13 and the bottom plate 11. It should be noted that since the three-dimensional mass block 211 in the vibrator system 2 needs to move in the outer shell 1, for this reason, the internal space of the outer shell 1 needs to meet the needs of the three-dimensional mass block 211 for the range of movement to avoid rigid collisions between each other.

[0050] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the resonance frequencies of each three-dimensional mass block 211 in the vibrator system 2 of the low-frequency broadband coupled damping vibration absorber of the present invention are different in each direction, and it contains two low-frequency resonance modes in each translation direction, which are divided into the same-direction vibration and reverse vibration modes of the inner and outer three-dimensional mass blocks 211, and there are a total of 6 low-frequency translation modes. The three-dimensional mass block 211 also has rotation modes around multiple central axes. Therefore, the vibrator system 2 has two translation modes and at least one rotation mode in each three-dimensional direction; further, in order to effectively improve the broadband damping effect of the present invention, the frequency ratio between the two translation modes is 1.5 to 3 times, and although the frequencies of the 6 translation modes in the three directions are different, they are closely spaced, so that the low-frequency effect is maintained in multiple vibration directions, so that the present invention has the ability of multi-directional vibration absorption.

[0051] Combination Figure 5 and Figure 6 As shown, according to an embodiment of the present invention, by changing the first characteristic parameter of the flexible side connector 212 and / or by changing the second characteristic parameter of the spring connection structure 213, the resonance frequency of each vibrator unit 21 in the vibrator system 2 in the three-dimensional direction is adjusted, so as to realize that each mode of the vibrator system 2 in the three-dimensional direction is different. In this embodiment, the first characteristic parameter is at least one of the hardness, shape, and material of the interlayer elastic block 212b; for example, the hardness, shape, and material of the flexible side connector 212 of the inner and outer vibrator units 21 are adjusted to be different, so that the resonance frequencies of the inner and outer vibrator units 21 are different. It should be noted that in other embodiments, the vibrator system 2 can also be set to more (such as three, four, etc.) vibrator units 21 to achieve mutual nesting arrangement, thereby, the same method as above can be adopted to achieve the corresponding flexible adjustment effect.

[0052] In this embodiment, the second characteristic parameter is at least one of the size, material, spring coefficient, and number of turns of the compression spring 213b. The effect of different resonance frequencies of the inner and outer vibrator units 21 can also be achieved by adjusting the second characteristic parameter, which will not be repeated here.

[0053] Furthermore, when there are multiple vibrator units 21, the resonance frequencies of the multiple vibrator units 21 are different, and thus at least one of the shape, volume, material, etc. of the three-dimensional mass block 211 can be set to be different, so as to achieve different resonance frequencies for the vibrator units 21, and then directly affect the resonance frequency of the vibrator system 2, thereby achieving flexible adjustment of the vibration mode in this scheme and the coupling state between different vibrator units 21, thereby producing different vibration reduction effects.

[0054] See also Fig.15 According to one embodiment of the present invention, the damping effect of the low-frequency broadband coupled damping vibration absorber of the present invention can be adjusted by adjusting the proportion of the stiffness provided by the sandwich elastic block 212b in the flexible side connector 212 to the overall stiffness. Taking a certain vibration absorber as an example, the weight of its three-dimensional mass block 211 is , the total stiffness (dynamic stiffness) provided by the sandwich elastic block 212b connected to the solid mass block 211 is , the total stiffness (dynamic stiffness) provided by the compression spring 213b is , the material loss factor of the sandwich elastic block 212b is , then under external displacement excitation, the low-frequency broadband coupled damping vibration absorber of the present invention has a frequency of The vibration transmissibility at is:

[0055] in, represents an imaginary number Furthermore, the engineering damping ratio of the low-frequency broadband coupled damping vibration absorber of the present invention is: .

[0056] Due to the loss factor of the sandwich elastic block 212b It is difficult to adjust and is usually determined by the material formula. Therefore, when the loss factor of the interlayer elastic block 212b is When determined, the damping ratio of the low-frequency broadband coupled damping vibration absorber of the present invention and the total stiffness provided by the sandwich elastic block 212b are Total dynamic stiffness of the system Therefore, after a given resonant frequency, when the damping of the low-frequency broadband coupled damping vibration absorber of the present invention is too large, the damping coefficient can be reduced by increasing the spring stiffness (dynamic stiffness) of the compression spring 213b and reducing the stiffness (dynamic stiffness) of the interlayer elastic block 212b. The transmissibility of the resonance peak of the vibration absorber will also increase as the above ratio decreases, thereby improving the narrowband effect.

[0057] In order to illustrate the effect of the low-frequency broadband coupled damping vibration absorber of the present invention on vibration suppression, based on the above-mentioned setting of the low-frequency broadband coupled damping vibration absorber, the effectiveness of its design is illustrated based on finite element simulation. In the low-frequency broadband coupled damping vibration absorber, the sandwich elastic block 212b in the flexible side connector 212 connected to the outer shell 1 and the three-dimensional mass block 211 in the outer layer is a hollow thin-walled rectangular parallelepiped with a size of 0.04m×0.04m×0.015m and a wall thickness of 0.006m, and its dynamic Young's modulus is 10Mpa; the sandwich elastic block 212b in the flexible side connector 212 connected to the inner and outer three-dimensional mass blocks 211 is a hollow thin-walled rectangular parallelepiped with a size of 0.04m×0.04m×0.015m and a wall thickness of 0.006m.

[0058] Furthermore, by adjusting the stiffness of the compression spring 213b in the spring connection structure 213, the vertical resonance frequency of the inner and outer vibrator units 21 can be adjusted. f 1, the resonant frequency of the outer oscillator unit 21 is f 2, then the optimized relationship is f 2=(1.5~3) f 1. This embodiment only gives an example of the method of the present invention, so that the resonance frequency of the vibrator unit 21 on the inner side is about 10Hz, and the resonance frequency of the vibrator unit 21 on the outer layer is about 25Hz. In this embodiment, in order to achieve a lower resonance frequency of the low-frequency broadband coupled damping vibration absorber, the hardness of the sandwich elastic block 212b in the flexible side connector 212 is too low, and the middle is a hollow design. A spring connection structure 213 needs to be provided under the three-dimensional mass block 211 to prevent the sandwich elastic block 212b in the flexible side connector 212 from creeping due to excessive deformation.

[0059] Combination Fig. 9 and Fig.10As shown, based on the above settings and according to finite element calculation, the Z-axis (vertical direction) translational modal frequencies of the low-frequency broadband coupled damping vibration absorber of the present invention are 10.8Hz (co-directional translation) and 25Hz (reverse translation), respectively. These two modes are the main modes for vibration control; the X-axis translational modal frequencies are 15.8Hz (co-directional translation) and 35.5Hz (reverse translation), respectively, which can be excited under the excitation in the X direction; the Y-axis translational modal frequencies are 11.2Hz (co-directional translation) and 52.7Hz (reverse translation), respectively, which can be excited under the excitation in the Y-axis direction. The rotational modal frequencies around the Z-axis, X-axis and Y-axis are 12.9Hz, 14.5 Hz and 5.5Hz, respectively, and can also be excited under the excitation of bending vibration.

[0060] like Fig.11 As shown, the low-frequency broadband coupled damping vibration absorber proposed by the present invention has a large width of low-frequency resonance peak and a high response peak, and the high-frequency peak also maintains a certain height and width, achieving the overall effect of "appropriately weakening high frequency and significantly enhancing low frequency". Under multi-directional excitation, the vibration absorber has a large low-frequency response, a wide response bandwidth, and multiple low-frequency modes are linked, achieving a low-frequency broadband effect.

[0061] In order to verify the low-frequency and broadband high-efficiency effect of the low-frequency and broadband coupled damping vibration absorber of the present invention, this embodiment installs the low-frequency and broadband coupled damping vibration absorber on a floating beam structure, and evaluates its vibration attenuation effect through finite element simulation.

[0062] Example 1 See also Fig.12 The size of the floating beam used is 300mm×60mm×4000mm, and the material is steel. Vibration isolators are installed at the end and the middle preset position of the floating beam, so that the first-order resonance frequency of the floating beam is about 10Hz. This frequency is usually determined by the actual system. This embodiment only uses this frequency for case analysis; the vibration isolator near the end of the floating beam is fixed to the ground. Considering that the damping ratio of the vibration isolator is 0.1, the low-frequency broadband coupled damping vibration absorber is installed near the left end, and the damping loss factor of the interlayer elastic block 212b in the low-frequency broadband coupled damping vibration absorber is 0.2. The ratio of the effective weight of the low-frequency broadband coupled damping vibration absorber to the total weight of the floating beam is 8%. Excite at any position on the floating beam, and compare the changes in the vibration displacement of the top of the vibration isolator when the low-frequency broadband coupled damping vibration absorber is installed and when the low-frequency broadband coupled damping vibration absorber is not installed. This embodiment shows that after the low-frequency broadband coupled damping vibration absorber is installed, the vibration peak value in the 10-20Hz range decreases by 70%, and the vibration reduction effect is significant. See. Fig.13 .

[0063] Example 2 A floating beam with the same structure as in Example 1 is adopted and the length of the floating beam is increased and the thickness is reduced, and its size is set to 300mm×30mm×8000mm, so as to excite more modes. Vibration isolators are installed at the ends and the middle preset positions of the floating beam so that the first-order resonance frequency of the floating beam is about 10Hz. Considering that the damping ratio of the vibration isolator is set to 0.1, the low-frequency broadband coupled damping vibration absorber is installed near the left end, and the damping loss factor of the interlayer elastic block 212b in the low-frequency broadband coupled damping vibration absorber is 0.2. The ratio of the effective weight of the low-frequency broadband coupled damping vibration absorber to the total weight of the floating beam is 8%. Excite at any position on the floating beam and use the same comparison method as in Example 1. After installing the low-frequency broadband coupled damping vibration absorber, the vibration peaks near 10Hz, 19Hz, 26.5Hz, 32Hz, and 46.75Hz decreased by 70%, 50%, 40%, and 36%, respectively, see Fig.14 ; There is a modal adjustment effect near 30Hz, and the vibration energy is significantly reduced after adjustment, which can be used for line spectrum control. It can be seen that the vibration absorber has a good broadband effect and a strong low-frequency effect, realizing low-frequency, broadband, and high-efficiency vibration control.

[0064] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0065] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly reliable low-frequency broadband coupled damping vibration absorber, characterized in that: include: An outer shell (1), and an oscillator system (2) arranged inside the outer shell (1); The oscillator system (2) comprises two oscillator units (21) with different resonance frequencies; The two vibrator units (21) are connected in an inner-outer nested manner; The vibrator unit (21) comprises: a three-dimensional mass block (211), flexible side connecting members (212) respectively arranged on two opposite sides of the three-dimensional mass block (211), and a spring connecting structure (213) arranged at the bottom of the three-dimensional mass block (211); In the vibrator system (2), the vibrator unit (21) on the outside is connected to the side wall of the outer shell (1) based on the flexible side connection piece (212), and the vibrator units (21) arranged inside and outside are connected based on the flexible side connection piece (212) of the vibrator unit (21) on the inside; The two vibrator units (21) are respectively connected to the bottom of the outer shell (1) based on the spring connection structure (213).

2. The low-frequency broadband coupled damping vibration absorber according to claim 1, characterized in that: In the vibrator system (2), the flexible side connectors (212) of the vibrator units (21) arranged inside and outside are arranged in a cross-arranged direction.

3. The low-frequency broadband coupled damping vibration absorber according to claim 2, characterized in that: The flexible side connecting piece (212) comprises: a first connecting steel plate (212a), an interlayer elastic block (212b) and a second connecting steel plate (212c); The interlayer elastic block (212b) is arranged between the first connecting steel plate (212a) and the second connecting steel plate (212c); The opposite ends of the sandwich elastic block (212b) are respectively fixedly connected to the first connecting steel plate (212a) and the second connecting steel plate (212c).

4. The low-frequency broadband coupled damping vibration absorber according to claim 3, characterized in that: The interlayer elastic block (212b) is made of a viscoelastic elastic material having a damping coefficient greater than 0.05 and less than 0.5; The interlayer elastic block (212b) is fixed to the first connecting steel plate (212a) and the second connecting steel plate (212c) by means of vulcanization connection.

5. The low-frequency broadband coupled damping vibration absorber according to claim 4, characterized in that: The spring connection structure (213) comprises: a first end steel plate (213a), a compression spring (213b) and a second end steel plate (213c); The compression spring (213b) is arranged between the first end steel plate (213a) and the second end steel plate (213c); The opposite ends of the compression spring (213b) are fixedly connected to the first end steel plate (213a) and the second end steel plate (213c), respectively.

6. The low-frequency broadband coupled damping vibration absorber according to claim 5, characterized in that: In the vibrator system (2), the three-dimensional mass block (211) of the vibrator unit (21) located on the inner side is a solid cylinder, and the three-dimensional mass block (211) of the vibrator unit (21) located on the outer side is a hollow cylinder; In the vibrator system (2), the spring connection structure (213) of the inner vibrator unit (21) is arranged in the middle of the bottom of the three-dimensional mass block (211), and a connection cavity (211a) for installing and accommodating the upper end of the spring connection structure (213) is arranged in the middle of the bottom of the three-dimensional mass block (211), so as to reduce the structural size; In the vibrator system (2), a plurality of spring connection structures (213) are evenly arranged at the bottom of the three-dimensional mass block (211) of the vibrator unit (21) located on the outside, and a connection cavity (211a) for mounting and accommodating the upper end of the spring connection structure (213) is provided at the bottom of the three-dimensional mass block (211) to reduce the structural size.

7. The low-frequency broadband coupled damping vibration absorber according to claim 6, characterized in that: The outer shell (1) comprises: a bottom plate (11), a plurality of supporting side plates (12), and a top plate (13); In the vibrator system (2), the flexible side connection piece (212) of the vibrator unit (21) located on the outside is connected to the supporting side plate (12), and all the spring connection structures (213) are respectively connected to the bottom plate (11).

8. The low-frequency broadband coupled damping vibration absorber according to claim 7, characterized in that: The oscillator system (2) has two translation modes and at least one rotation mode in each direction of the three-dimensional direction; The frequency ratio between the two translational modes is between 1.5 and 3 times.

9. The low-frequency broadband coupled damping vibration absorber according to claim 8, characterized in that: By changing a first characteristic parameter of the flexible side connection member (212) and / or by changing a second characteristic parameter of the spring connection structure (213), the modal frequency of the vibrator system (2) in a three-dimensional direction is adjusted; The first characteristic parameter is at least one of the hardness, shape and material of the interlayer elastic block (212b); The second characteristic parameter is at least one of the size, material, spring coefficient, and number of turns of the compression spring (213b).

10. The low-frequency broadband coupled damping vibration absorber according to claim 9, characterized in that: The engineering damping ratio of the low-frequency broadband coupled damping vibration absorber is adjusted based on the stiffness ratio of the dynamic stiffness of the sandwich elastic block (212b) to the total dynamic stiffness of the low-frequency broadband coupled damping vibration absorber, wherein the total dynamic stiffness of the low-frequency broadband coupled damping vibration absorber is the sum of the dynamic stiffness of the sandwich elastic block (212b) and the dynamic stiffness of the compression spring (213b); If the stiffness ratio decreases, the engineering damping ratio decreases, wherein the stiffness ratio is reduced based on reducing the dynamic stiffness of the sandwich elastic block (212b) or increasing the dynamic stiffness of the compression spring (213b).

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