Composite damper based on nonlinear energy trap

Abstract

The invention relates to the technical field of damping energy dissipation and vibration attenuation, and provides a composite damper based on a nonlinear energy sink, which comprises an upper support and a lower support, an upper sliding cavity is arranged on the lower surface of the upper support, a lower sliding cavity is arranged on the upper surface of the lower support, and the lower surface of the upper sliding cavity is slidably connected with the upper surface of a particle damping system. The lower end of the particle damping system is fixedly connected with a power generation system, the lower end of the power generation system is connected with a motor energy consumption system, the lower surface of the motor energy consumption system is slidably connected with the upper surface of the lower sliding cavity, and the upper support and the lower support are connected through a support. Through the combination of multiple mechanisms of a power generation system, a friction steel plate energy dissipation system, a friction pendulum energy dissipation system, a particle damping system and a motor energy dissipation system, effective vibration reduction and energy dissipation in a wide frequency range are achieved, and through the synergistic effect of multiple modes such as friction, piezoelectric effect, memory alloy and electromagnetic energy conversion, the energy dissipation efficiency is improved. And the vibration reduction performance and the energy recovery efficiency are obviously improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of damping energy dissipation vibration reduction, and particularly relates to a composite damper based on a non-linear energy sink. Background Art

[0002] With the development of society, traditional vibration reduction technologies, such as viscous dampers, metal dampers, etc., have certain limitations in dealing with structural vibrations. Especially in high-frequency vibrations and transient impact conditions, the vibration reduction effect is not good. That is: when using a viscous damper, in high-frequency vibrations, due to the inertial and viscous characteristics of the fluid, it may not be able to generate sufficient damping force in time to effectively dissipate energy, resulting in an unsatisfactory vibration reduction effect. For transient impact conditions, the viscous damper requires a certain time to build up the damping force. At the moment of impact, it may not be able to quickly provide sufficient resistance to reduce the response of the structure, and there is a problem of response lag; while using a metal damper, in high-frequency vibrations, due to the short vibration period, the metal damper may not be able to fully exert its energy dissipation ability, resulting in a poor vibration reduction effect. In transient impact conditions, the metal damper will be subjected to a large impact force, and repeated impacts may cause fatigue damage to the metal material, and even damage may occur in a short time, causing the damper to lose its vibration reduction function. In addition, the metal damper may have permanent deformation under large deformations, affecting its subsequent vibration reduction performance. Therefore, the vibration reduction use of dampers under the existing technical conditions is limited and difficult to adapt to various external vibrations, and often can only play a good role under specific working conditions. Especially in the fields of buildings, bridges, and precision equipment, the demand for an efficient and adaptable damper solution is becoming increasingly urgent.

[0003] Based on this, there is an urgent need for a composite damper based on a non-linear energy sink, which should exhibit excellent damping performance and broadband response characteristics. Moreover, this damper integrates the energy absorption function of the non-linear energy sink and the friction energy dissipation function, and can more efficiently absorb and dissipate the structural vibration energy. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a composite damper with a non-linear energy sink, which mainly realizes effective vibration reduction and energy recovery through the energy consumption of the motor energy consumption system and the friction energy dissipation and collision generated by metal particles coated with piezoelectric coatings during the friction pendulum movement.

[0005] The purpose of the present invention is solved by the following technical solutions:

[0006] The present invention provides a composite damper based on a non - linear energy sink, which includes an upper support and a lower support. An upper sliding cavity is arranged on the lower surface of the upper support, and a lower sliding cavity is arranged on the upper surface of the lower support. The lower surface of the upper sliding cavity is slidably connected to the upper surface of a particle damping system. The lower end of the particle damping system is fixedly connected to a power generation system, and the lower end of the power generation system is connected to a motor energy - consuming system. The lower surface of the motor energy - consuming system is slidably connected to the upper surface of the lower sliding cavity. The upper support and the lower support are also connected by a bracket.

[0007] Further, the particle damping system includes a shape - memory alloy cover. The shape - memory alloy cover is filled with metal particles inside. A shape - memory alloy tube is vertically arranged in the middle of the shape - memory alloy cover. The upper end of the shape - memory alloy tube is fixedly connected to the inner side of the upper surface of the shape - memory alloy cover, and the lower end of the shape - memory alloy tube is fixedly connected to the inner side of the lower surface of the shape - memory alloy cover.

[0008] Further, the power generation system is arranged in an upper box body, and the upper end of the upper box body is fixedly connected to the lower end of the particle damping system.

[0009] Preferably, the power generation system includes a compressed glassy carbon mesh. Piezoelectric - coated metal particles are filled inside the compressed glassy carbon mesh. The lower end of the compressed glassy carbon mesh is fixedly connected to an upper friction steel plate. A lower friction steel plate is arranged at an interval below the upper friction steel plate. Two second springs are respectively fixed on both sides of the lower surface of the lower friction steel plate, and the lower ends of the second springs are fixed to the upper end of a lower box body. A copper tube is arranged vertically in the middle of the upper box body. The upper end of the copper tube is fixedly connected to the inner side of the upper surface of the upper box body, and its lower end passes through the compressed glassy carbon mesh, the upper friction steel plate, the lower friction steel plate and the upper surface of the lower box body in sequence and then is connected to the motor energy - consuming system.

[0010] Preferably, a commutator is fixed at the lower end of the copper tube. A first spring is fixedly arranged inside the copper tube. The upper end of the first spring is fixedly connected to the inner side of the upper surface of the upper box body, and its lower end is connected to the coil of the motor energy - consuming system.

[0011] Further, the motor energy - consuming system is arranged in a lower box body. The motor energy - consuming system includes a commutator. The lower end of the commutator is connected to a coil. A magnet is arranged below the coil. The lower end of the magnet is fixedly connected to the lower surface of the lower box body through a fixing seat.

[0012] Preferably, the magnet is a U - shaped magnet, and the coil is arranged in the U - shaped magnet.

[0013] Further, the bracket is an arched compressed glassy carbon bracket.

[0014] Further, the lower surface of the upper sliding cavity and the upper surface of the lower sliding cavity are both arranged in a semi-circular arc shape, and sliding grooves are respectively formed on the lower surface of the upper sliding cavity and the upper surface of the lower sliding cavity. Sliders that are slidably matched with the corresponding sliding grooves are fixedly arranged at the upper end of the particle damping system and the lower end of the motor energy consumption system respectively.

[0015] Further, the particle damping system is a non-linear energy sink particle damper.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) In the particle damping system of the present invention, a non-linear energy sink element is introduced, which has a relatively wide frequency capture range and can effectively cope with vibrations of different frequencies of structures such as buildings.

[0018] (2) The slidable surfaces of the upper and lower sliding cavities in the present invention are in a semi-circular arc shape, and this swingable structure is beneficial to the self-resetting of the overall device.

[0019] (3) In the power generation system of the present invention, compressed glassy carbon is adopted. Compressed glassy carbon has high elastic recovery and certain electrical conductivity. It can cooperate with piezoelectric coating metal particles to improve the vibration damping performance and greatly improve the energy consumption efficiency.

[0020] (4) An arched compressed glassy carbon support is further arranged between the upper and lower supports of the present invention, which can provide greater support stiffness for the whole device, ensure the stability of the device, and can self-reset after deformation.

[0021] (5) Through the arrangement and connection of the compressed glassy carbon net, copper pipe and the first spring, the present invention can utilize the electric energy generated by the collision of piezoelectric coating metal particles, transmit it to the motor energy consumption system for further energy consumption, and improve the energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings here are incorporated into the specification and form a part of the specification, and are used together with the specification to explain the principle of the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the composite damper based on non-linear energy sink of the present invention.

[0025] Among them, 1 - upper support; 2 - lower support; 3 - shape memory alloy cover; 31 - metal particles; 32 - shape memory alloy tube; 4 - upper box body; 5 - compressed glassy carbon net; 51 - piezoelectric coating metal particles; 6 - upper friction plate; 7 - lower friction plate; 8 - second spring; 9 - lower box body; 10 - copper tube; 11 - commutator; 12 - coil; 13 - magnet; 14 - bracket; 15 - fixed seat; 101 - first spring; 111 - upper sliding cavity; 211 - lower sliding cavity. Detailed implementation manners

[0026] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are only examples consistent with some aspects of the present invention detailed in the appended claims.

[0027] To enable those skilled in the art to better understand the technical solutions of the present invention, the following combines the attached Figure 1 drawings and embodiments to further describe the present invention in detail.

[0028] According to an embodiment of the present invention, a composite damper based on a non - linear energy sink of the present invention includes an upper support 1 provided at the upper end and a lower support 2 provided at the lower end. An upper sliding cavity 111 is provided on the lower surface of the upper support 1, and a lower sliding cavity 211 is provided on the upper surface of the lower support 2. The lower surface of the upper sliding cavity 111 is slidably connected to the upper surface of the particle damping system. The lower end of the particle damping system is fixedly connected to a power generation system, and the lower end of the power generation system is connected to a motor energy - consumption system. The lower surface of the motor energy - consumption system is slidably connected to the upper surface of the lower sliding cavity 211. The upper and lower supports 1, 2 and the upper and lower sliding cavities 111, 211 form a friction pendulum system. The particle damping system has the characteristics of a non - linear energy sink. The power generation system is filled with piezoelectric coating metal particles 51 that collide within the compressed glassy carbon net 5 and are converted into electrical energy. Both the upper support 1 and the lower support 2 are rubber supports, which have advantages such as good elasticity and vibration - damping performance, strong adaptability to deformation, high durability, and economy.

[0029] According to an embodiment of the present invention, the lower surface of the upper sliding cavity 111 and the upper surface of the lower sliding cavity 211 are both arranged in a semi - circular arc shape, and sliding grooves are respectively opened on the lower surface of the upper sliding cavity 111 and the upper surface of the lower sliding cavity 211. Sliders that are slidably matched with the corresponding sliding grooves are fixedly provided at the upper end of the particle damping system and the lower end of the motor energy - consumption system respectively.

[0030] According to an embodiment of the present invention, the particle damping system includes a shape memory alloy cover 3. The inside of the shape memory alloy cover 3 is filled with metal particles 31. A shape memory alloy tube 32 is vertically arranged in the middle of the shape memory alloy cover 3. The upper end of the shape memory alloy tube 32 is fixedly connected to the inner side of the upper surface of the shape memory alloy cover 3 by welding, and the lower end of the shape memory alloy tube 32 is also fixedly connected to the inner side of the lower surface of the shape memory alloy cover 3 by welding. By the collision of the metal particles 31 in the friction pendulum structure, the vibration energy can be effectively absorbed and dissipated. Through this particle damping system, the vibration energy of the main structure is absorbed, and these energies are dissipated through the particle damping element inside the non-linear energy well, that is, the metal particles 31 continuously dissipate energy through collision inside the shape memory alloy cover 3.

[0031] According to an embodiment of the present invention, the power generation system is arranged in the upper box body 4. The upper end of the upper box body 4 is fixedly connected to the lower end of the particle damping system, that is, the upper end of the upper box body 4 is fixedly connected to the lower surface of the shape memory alloy cover 3, and can be connected by welding. The power generation system includes a compressed glassy carbon mesh 5. Piezoelectric coating metal particles 51 are filled inside the compressed glassy carbon mesh 5. The lower end of the compressed glassy carbon mesh 5 is fixedly connected to an upper friction steel plate 6. The lower friction steel plate 7 is arranged at intervals below the upper friction steel plate 6. Two second springs 8 are respectively fixed on both sides of the lower surface of the lower friction steel plate 7. The lower ends of the second springs 8 are fixedly connected to the upper end of the lower box body 9. A copper tube 10 is arranged vertically in the middle of the upper box body 4. The upper end of the copper tube 10 is fixedly connected to the inner side of the upper surface of the upper box body 4, and its lower end sequentially passes through the compressed glassy carbon mesh 5, the upper friction steel plate 6, the lower friction steel plate 7 and the upper surface of the lower box body 9 and then is connected to the motor energy consumption system. A commutator 11 is fixed at the lower end of the copper tube 10. A first spring 101 is fixedly arranged inside the copper tube 10. The upper end of the first spring 101 is fixedly connected to the inner side of the upper surface of the upper box body 4, and its lower end is connected to the coil 12 of the motor energy consumption system.

[0032] According to an embodiment of the present invention, the structure of the power generation system of the present invention can also be composed of a three-layer structure: the upper box body 4 is a cubic box body. A copper tube 10 is welded at the central axis of the upper surface of the upper box body 4 and is installed inside the upper box body 4 in sequence below. The first layer is funnel-shaped, with a compressed glassy carbon material partition net on the outside and a certain amount of piezoelectric coating metal particles 51 filled in the middle. Here, the size of the piezoelectric coating metal particles 51 should be larger than the aperture of the partition net; the second layer is an inverted triangular steel plate, welded to the steel tube 10, that is, the upper friction steel plate 6; the third layer is a rectangular steel plate with the same contact area as the upper steel plate, that is, the lower friction steel plate 7, and a pair of second springs 8 are placed on the left and right sides below the lower friction steel plate 7. The above three layers are all penetrated by the copper tube 10. A commutator 11 is welded at the bottom of the copper tube 10, and the commutator 11 is connected to the convex character coil 12. The upper friction steel plate 6, the lower friction steel plate 7 and the second spring 8 form a friction steel plate energy consumption system.

[0033] According to an embodiment of the present invention, the motor energy consumption system is disposed in the lower box body 9. The motor energy consumption system includes a commutator 11. The upper end of the commutator 11 is fixedly connected to the lower end of the copper tube 10. The commutator 11 is also connected to the first spring 101 inside the copper tube 10. That is, the first spring 101 acts as a wire to transfer the current formed after the collision of the piezoelectric coating metal particles 51 from the copper tube 10 to the first spring 101, and the current is transferred to the commutator 11 through the first spring 101. The lower end of the commutator 11 is connected with a coil 12. A magnet 13 is disposed at the lower end of the coil 12. The lower end of the magnet 13 is fixedly connected to the lower surface of the lower box body 9 through a fixing seat 15. Specifically, the magnet 13 is a U-shaped magnet, and the coil 12 is disposed in the U-shaped magnet.

[0034] According to an embodiment of the present invention, the upper support 1 and the lower support 2 are also connected through a bracket 14. The bracket 14 is an arched compression glassy carbon bracket. That is, an arched bracket is added outside the whole device. Both ends of the bracket are located in the upper and lower supports 1 and 2. The arched compression glassy carbon bracket provides a large support stiffness for the whole damper to ensure the stability of the device, and it can be self-reset after deformation.

[0035] According to an embodiment of the present invention, the working principle of the composite damper based on the non-linear energy sink of the present invention is as follows:

[0036] The core of the structure of the present invention is a friction pendulum structure, which includes: an upper support 1, a lower support 2, an upper sliding cavity 111, a lower sliding cavity 211, a particle damping system, a power generation system, and a motor energy consumption system. When an external vibration or impact acts on the device, the upper friction steel plate 6, the lower friction steel plate 7, and the second spring 8 all deform, causing the upper friction steel plate 6 and the lower friction steel plate 7 to contact and generate frictional force, thereby realizing the dissipation of vibration energy. During this process, the piezoelectric coating metal particles 51 coated with piezoelectric materials collide and rub to generate electric energy. The friction and collision contact between the upper friction steel plate 6 and the lower friction steel plate 7 and the piezoelectric coating metal particles 51 enhance the damping effect, thereby realizing effective energy consumption and recovery. The non-linear energy sink of the particle mass damper includes: the metal particles 31 collide in the friction pendulum structure, thereby effectively absorbing and dissipating vibration energy. Through this particle damping system, the vibration energy of the main structure is absorbed, and these energies are dissipated through the particle damping elements inside the non-linear energy sink. The process of converting the electric energy generated by the collision of the piezoelectric coating metal particles 51 with piezoelectric coatings further enhances the efficiency of energy recovery, ensuring the high performance of the whole device.

[0037] In this composite damper, the piezoelectric-coated metal particles 51 with a piezoelectric coating generate electrical energy through their collisions. This electrical energy is connected to the motor energy dissipation system through the copper tube 10 and the first spring 101. The electrical energy forms an electric current through the coil 12 in the motor system, thereby driving the coil 12 to move and dissipating energy. Specifically, the electrical energy is connected to the motor energy dissipation system through the copper tube 10 and the first spring 101. The electric current is generated by the coil 12 in the motor energy dissipation system, and a magnetic field is generated around it, forming an electromagnetic effect. When energized, the coil 12 rotates continuously through the interaction of magnetic fields, thereby dissipating energy. This process can not only effectively convert the collision energy into electrical energy but also further dissipate the energy through the motor energy dissipation system.

[0038] In this composite damper, the upper structure includes a shape memory alloy tube 32, a shape memory alloy cover 3, and metal particles 31. These components are isolated from the motor energy dissipation system and the friction plate energy dissipation system of the device. During the movement of the friction pendulum, the shape memory alloy tube 32 and the shape memory alloy cover 3 deform according to the changes in external vibrations. During the deformation process, it can dissipate energy and reset after the external force is removed, avoiding fatigue and damage during long-term use.

[0039] In this composite damper, the bracket 14 is made of compressed glassy carbon, which can not only provide sufficient support force to ensure the stability of the device but also has the ability to deform and reset, effectively absorbing external impact forces and reducing the influence of external vibrations on the device structure.

[0040] The composite damper based on a non-linear energy sink of the present invention realizes effective vibration reduction and energy dissipation in a wide frequency range through the combination of multiple mechanisms such as a power generation system, a friction steel plate energy dissipation system, a friction pendulum energy dissipation system, a particle damper non-linear energy sink, and a motor energy dissipation system. Through the synergistic effect of multiple methods such as friction, piezoelectric effect, shape memory alloy, and electromagnetic energy conversion, the vibration reduction performance and energy recovery efficiency are significantly improved, and it is applicable to various engineering fields that require high-efficiency vibration reduction and energy recovery.

[0041] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0042] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] It should be understood that the present invention is not limited to the above-described content and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A composite damper based on a non-linear energy sink, characterized in that, It includes an upper support (1) and a lower support (2). An upper sliding cavity (111) is provided on the lower surface of the upper support (1), and a lower sliding cavity (211) is provided on the upper surface of the lower support (2). The lower surface of the upper sliding cavity (111) is slidably connected to the upper surface of the particle damping system. The lower end of the particle damping system is fixedly connected to a power generation system, and the lower end of the power generation system is connected to a motor energy consumption system. The lower surface of the motor energy consumption system is slidably connected to the upper surface of the lower sliding cavity (211). The upper support (1) and the lower support (2) are also connected by a bracket (14).

2. The composite damper based on the non-linear energy sink according to claim 1, wherein The particle damping system includes a shape memory alloy cover (3). The shape memory alloy cover (3) is filled with metal particles (31). A shape memory alloy tube (32) is vertically arranged in the middle of the shape memory alloy cover (3). The upper end of the shape memory alloy tube (32) is fixedly connected to the inner side of the upper surface of the shape memory alloy cover (3), and the lower end of the shape memory alloy tube (32) is fixedly connected to the inner side of the lower surface of the shape memory alloy cover (3).

3. The composite damper based on the non-linear energy sink according to claim 1, wherein The power generation system is arranged in an upper box body (4), and the upper end of the upper box body (4) is fixedly connected to the lower end of the particle damping system.

4. The composite damper based on the non-linear energy sink according to claim 3, characterized in that, The power generation system includes a compressed glassy carbon mesh (5). Piezoelectric coating metal particles (51) are filled in the compressed glassy carbon mesh (5). The lower end of the compressed glassy carbon mesh (5) is fixedly connected to an upper friction steel plate (6). A lower friction steel plate (7) is arranged at intervals below the upper friction steel plate (6). Two second springs (8) are respectively fixed on both sides of the lower surface of the lower friction steel plate (7), and the lower ends of the second springs (8) are fixed to the upper end of a lower box body (9). A copper tube (10) is vertically arranged in the middle of the upper box body (4). The upper end of the copper tube (10) is fixedly connected to the inner side of the upper surface of the upper box body (4), and its lower end sequentially passes through the compressed glassy carbon mesh (5), the upper friction steel plate (6), the lower friction steel plate (7) and the upper surface of the lower box body (9) and then is connected to the motor energy consumption system.

5. The composite damper based on the non-linear energy sink according to claim 4, wherein A commutator (11) is fixed at the lower end of the copper tube (10). A first spring (101) is fixedly arranged inside the copper tube (10). The upper end of the first spring (101) is fixedly connected to the inner side of the upper surface of the upper box body (4), and its lower end is connected to the coil (12) of the motor energy consumption system.

6. The composite damper based on a non-linear energy sink according to claim 1, characterized in that, The motor energy consumption system is arranged in the lower box body (9). The motor energy consumption system includes a commutator (11). The lower end of the commutator (11) is connected to a coil (12). A magnet (13) is arranged below the coil (12). The lower end of the magnet (13) is fixedly connected to the lower surface of the lower box body (9) through a fixing seat (15).

7. The composite damper based on a non-linear energy sink according to claim 6, characterized in that, The magnet (13) is a U-shaped magnet, and the coil (12) is arranged in the U-shaped magnet.

8. The composite damper based on the non-linear energy sink according to claim 1, wherein The bracket (14) is an arched compressed glassy carbon bracket.

9. The composite damper based on the non-linear energy sink according to claim 1, characterized in that The lower surface of the upper sliding cavity (111) and the upper surface of the lower sliding cavity (211) are both arranged in a semi-circular arc shape, and sliding grooves are respectively formed on the lower surface of the upper sliding cavity (111) and the upper surface of the lower sliding cavity (211). Sliders that are slidably matched with the corresponding sliding grooves are fixedly arranged at the upper end of the particle damping system and the lower end of the motor energy consumption system respectively.

10. The composite damper based on a non-linear energy sink according to claim 1, characterized in that, The particle damping system is a non-linear energy sink particle damper.

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