Semi-active modular bistable particle damper

Abstract

The invention relates to a semi-active modular bistable particle damper. The semi-active modular bistable particle damper comprises a particle damping container and damping particles, the particle damping container comprises side plates, a partition plate arranged between the side plates and a movable baffle capable of penetrating through the partition plate. The partition plates divide the particle damping container into a control unit channel and a damping unit channel, a ball screw mechanism is arranged in the control unit channel, bistable partition plates are arranged between the adjacent partition plates of the damping unit channel, and damping particles are arranged between the bistable partition plates and the movable baffle. The bistable partition plate is a buckling plate capable of generating negative stiffness and is provided with a one-way protrusion, and the bistable partition plate can generate elastic buckling under collision of the damping particles and repeatedly jump between a first stable state and a second stable state. Compared with the prior art, the energy consumption of particle collision is increased through the bistable negative stiffness partition plate, and semi-active control based on particle damping is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of civil structure vibration control, and in particular to a semi-active modular bistable particle damper. Background Art

[0002] Particle damper is a nonlinear damper that mainly relies on collision and friction to exert control force on the main structure and achieve energy dissipation. It has the advantages of high robustness and wide vibration reduction bandwidth, and is often used for vibration control in the fields of machinery, aviation and civil engineering. Particle dampers generate momentum exchange through collision, so that the energy of the main structure is transferred to the particles. Studies have found that particle collisions are divided into "beneficial collisions" and "harmful collisions". The former occurs when the particle speed is opposite to the speed of the main structure, which helps to control the vibration, while the latter occurs when the particle speed is in the same direction as the speed of the main structure, which may amplify the vibration of the main structure.

[0003] Studies have found that particle dampers have an optimal collision spacing. Too small a spacing will lead to an increase in "harmful collisions", while too large a spacing will reduce "beneficial collisions". Therefore, when the spacing of the particle damper is the optimal collision spacing, its vibration reduction effect is optimal. However, the optimal collision spacing is related to the vibration response of the main structure, and the vibration response of the main structure is different under different excitations. As a passive control device, the traditional particle damper cannot automatically adjust the collision spacing according to different excitations.

[0004] In addition, the container and particles of the particle damper are usually made of metal, and sometimes the inner wall of the container or the surface of the particles are covered with buffer materials. When the materials of the colliding particles and the container are determined, the momentum exchange and energy consumption are in a trade-off relationship, that is, when the energy consumption is high, the movement of the particles is hindered; when the particle movement is more violent, the energy consumption is less. Therefore, the particle damper with buffer material is difficult to fully play its role when the amplitude is small, while the particle damper without buffer material takes a long time to stop the movement of the particles when the amplitude is large. Both situations will make it difficult to achieve the ideal efficiency of collision energy consumption, and there is also the problem of difficulty in production when covering the particles with buffer materials.

[0005] Therefore, in order to solve the technical problems of the above-mentioned particle damper, such as the immutable collision spacing and the low collision energy consumption efficiency, a new type of particle damper is still to be developed. Summary of the invention

[0006] The purpose of the present invention is to provide a semi-active modular bistable particle damper in order to solve the problems of the traditional particle damper that the collision distance is not variable and the collision energy consumption efficiency is not high.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A semi-active modular bistable particle damper comprises a particle damping container and damping particles that collide and consume energy in the particle damping container, wherein the particle damping container comprises side plates, a plurality of partition plates arranged between the side plates, and a pair of movable baffles that can span and pass through the partition plates;

[0009] The partition plate divides the particle damping container into a control unit channel located in the middle and damping unit channels arranged on both sides of the control unit channel; wherein a ball screw mechanism for driving two movable baffles to move toward each other is arranged in the control unit channel; bistable partition plates are arranged between adjacent partition plates of the damping unit channel, and damping particles are arranged between the bistable partition plates and the movable baffle plates on the corresponding sides;

[0010] The bistable diaphragm is a buckling plate capable of generating negative stiffness and has a unidirectional protrusion. The bistable diaphragm can generate elastic buckling under the collision of damping particles and repeatedly transition between a first stable state and a second stable state.

[0011] Furthermore, the modular bistable particle damper is composed of a plurality of particle damping containers that are horizontally laid and / or vertically stacked.

[0012] Furthermore, the damping particles are spherical metal particles, and the diameter of the damping particles is adapted to the width of the damping unit channel.

[0013] Furthermore, a pair of guide rods are provided between the side plates, and the guide rods respectively pass through the ends of the movable baffle plates and are connected to the side plates on the corresponding sides.

[0014] Furthermore, both ends of the partition plate are provided with sliding grooves for the movable baffle to move.

[0015] Furthermore, the ball screw mechanism includes a screw rod passing through the middle of the movable baffle, a ball nut connected to the middle of the movable baffle, and a motor for driving the screw rod to rotate, and the ball nuts on the same screw rod have opposite rotation directions.

[0016] Furthermore, the thickness of the bistable partition is 1.5-3 mm.

[0017] Furthermore, the rise of the bistable partition is 1.4-1.7 times of its thickness.

[0018] Furthermore, the width of the bistable partition is 1 / 2-2 / 3 of the diameter of the damping particles.

[0019] Furthermore, the bistable partition is composed of a partition core and a partition buffer layer arranged on both sides of the partition core.

[0020] Furthermore, the material of the inner core of the partition is thermoplastic polyurethane.

[0021] Furthermore, the material of the partition buffer layer is foamed polyurethane.

[0022] Furthermore, when the movement speed of the damping particles is relatively low, the damping particles squeeze the partition buffer layer of the bistable partition to absorb a small amount of energy. When the movement speed of the damping particles is relatively high, the damping particles collide with the bistable partition to cause elastic instability and then transition between the first stable state and the second stable state to absorb a large amount of energy.

[0023] Furthermore, in each damping unit channel at the initial stage of vibration, the unidirectional protrusions of the bistable partition are alternately arranged in different directions.

[0024] Furthermore, the modular bistable particle damper is also connected to a control system.

[0025] Furthermore, the control system includes a first sensor, a second sensor and a controller; wherein the first sensor is used to collect external excitations of the main structure, and the second sensor is used to collect structural responses of the main structure; the controller is used to receive and process information collected by the first sensor and the second sensor, and control the ball screw mechanism to change the position of the movable baffle, thereby ensuring that the collision spacing of the damping particles is always in an optimal state.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The two damping particles in the damping unit channel of the particle damper of the present invention can reciprocate between the bistable partition and the movable baffle, and then collide with the bistable partition to cause it to produce elastic buckling and repeatedly jump between the first stable state and the second stable state, thereby achieving continuous energy dissipation. Therefore, the present invention increases the energy consumption of particle collision by using the bistable negative stiffness partition, and solves the problem that the collision spacing of the traditional particle damper is immutable and the "optimal collision" ratio is difficult to control, thereby realizing semi-active control based on particle damping.

[0028] (2) The bistable partition of the present invention has a graded energy dissipation mechanism due to the ingenious arrangement of the inner core and the outer buffer layer. When the damping particles move at a low speed, a small amount of energy is absorbed by squeezing the foamed polyurethane buffer layer on the bistable partition. When the particles move at a high speed, the bistable partition produces elastic instability, deforms from one stable state to another, and absorbs a large amount of energy.

[0029] (3) The bistable partition of the present invention can not only achieve bistable state, but also constrain the bistable partition to only undergo first-order elastic instability through the ratio of the bistable partition's height and thickness. At this time, the deformation of the bistable partition generated by the transition between stable states has little effect on the particle collision distance. Therefore, the deformation of the bistable partition can be ignored when semi-active control is performed to adjust the baffle position. The partition buffer layer on both sides of the bistable partition can not only increase the energy consumption when the particle movement speed is relatively small and reduce the noise of the collision, but also increase the energy consumption generated by the partition when it transitions between stable states through the closing and opening of the pores inside the material.

[0030] (4) The particle damper of the present invention changes the position of the movable baffle by controlling the ball screw mechanism, so that the collision spacing of the damping particles is always in the optimal state under different excitations, thereby generating more "beneficial collisions" and the least "harmful collisions", thereby improving the vibration reduction effect and realizing semi-active control. Other semi-active control schemes may involve changing the temperature, changing the magnetic field, etc., while the present invention uses machinery to realize semi-active control, with clear mechanical principles, fast response speed, low power consumption, simple structure and high reliability.

[0031] (5) The present invention adopts a modular design. The energy dissipation mechanism of each particle damping unit is consistent and the structure is compact. The particle damping units can be stacked vertically, expanded horizontally, or rotated to meet the vibration reduction requirements of different main structures, thereby achieving a better vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of the modular bistable particle damper of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure after a plurality of particle damping containers of the present invention are laid flat and / or stacked.

[0034] Figure 3 It is a top view of the modular bistable particle damper of the present invention.

[0035] Figure 4 It is a front view of the modular bistable particle damper of the present invention.

[0036] Figure 5 It is a side view of the modular bistable particle damper of the present invention.

[0037] Figure 6 It is a cross-sectional view of the bistable separator of the present invention.

[0038] Figure 7 It is a bistable schematic diagram of the bistable separator of the present invention.

[0039] Figure 8It is a block diagram of the semi-active control system of the present invention.

[0040] Description of the markings in the figure:

[0041] 1-particle damping container, 11-side plate, 12-partition plate, 13-movable baffle, 14-guide rod;

[0042] 2- Damping particles;

[0043] 3-Control unit channel;

[0044] 4- Damping unit channel;

[0045] 5-ball screw mechanism, 51-screw, 52-ball nut, 53-motor;

[0046] 6-bistable partition, 61-partition core, 62-partition buffer layer. DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0048] In the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. 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.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0050] Embodiment 1:

[0051] This embodiment provides a semi-active modular bistable particle damper, including a particle damping container 1 and damping particles 2 that dissipate energy by collision in the particle damping container 1 .

[0052] like Figure 1 As shown, the particle damping container 1 of this embodiment comprises side plates 11, a plurality of partition plates 12 arranged between the side plates 11, and a pair of movable baffles 13 that can span and pass through the partition plates 12. The partition plates 12 divide the particle damping container 1 into a control unit channel 3 located in the middle and damping unit channels 4 arranged on both sides of the control unit channel 3, wherein the control unit channel 3 of this embodiment is provided with a ball screw mechanism 5 for driving the two movable baffles 13 to move toward each other.

[0053] In this embodiment, bistable partitions 6 are arranged between adjacent partition plates 12 of the damping unit channel 4, and damping particles 2 are arranged between the bistable partitions 6 and the movable baffles 13 on the corresponding side. The bistable partitions 6 in each damping unit channel 4 are buckling plates capable of generating negative stiffness and have a unidirectional protrusion. The bistable partitions 6 can generate elastic buckling under the collision of the damping particles 2 and repeatedly transition between the first stable state and the second stable state.

[0054] When the main structure vibrates, the damping particles 2 in the particle damper will move relative to the particle damping container 1 due to inertia, and the two damping particles 2 in the damping unit channel 4 will reciprocate between the bistable partition 6 and the movable baffle 13, and then hit the bistable partition 6 to cause elastic buckling and repeatedly transition between the first stable state and the second stable state, thereby achieving continuous energy dissipation. In this embodiment, the position of the movable baffle 13 can also be changed by controlling the ball screw mechanism 5, so that the collision spacing of the damping particles 2 is always in the optimal state, thereby generating more "beneficial collisions", thereby improving the vibration reduction effect and achieving semi-active control.

[0055] Embodiment 2:

[0056] This embodiment provides a semi-active modular bistable particle damper, including a particle damping container 1 and damping particles 2 that dissipate energy by collision in the particle damping container 1 .

[0057] The difference from Example 1 is that Figure 2 As shown, the modular bistable particle damper of this embodiment is composed of a plurality of particle damping containers 1 laid horizontally and / or stacked vertically, and each particle damping container 1 includes a plurality of damping unit channels 4. Since the energy dissipation mechanism in each particle damping container 1 is consistent, the vibration reduction requirements of different main structures can be met by stacking, horizontally expanding or rotating the particle damping container 1, thereby achieving a better vibration reduction effect.

[0058] In order to ensure that the kinetic energy of the main structure is transmitted to the modular bistable particle damper of this embodiment as much as possible, and to generate the greatest possible collision force when the momentum exchange of the collision occurs, the damping particles 2 of this embodiment are spherical metal particles with a larger density, and the diameter of the damping particles 2 is adapted to the width of the damping unit channel 4 to maximize the collision energy consumption of the damping particles 2 in the damping unit channel 4.

[0059] Embodiment 3:

[0060] This embodiment provides a semi-active modular bistable particle damper, including a particle damping container 1 and damping particles 2 that dissipate energy by collision in the particle damping container 1 .

[0061] The difference from the first embodiment is that a pair of guide rods 14 are provided between the side plates 11 of the present embodiment. The guide rods 14 are symmetrically distributed at the end positions of both sides of the particle damping container 1, and the guide rods 14 respectively pass through the ends of the movable baffles 13 and are connected to the side plates 11 on the corresponding sides. In order to facilitate the sliding of the movable baffles 13, both ends of the partition plate 12 are provided with sliding grooves for the movable baffles 13 to move.

[0062] Embodiment 4:

[0063] This embodiment provides a semi-active modular bistable particle damper, including a particle damping container 1 and damping particles 2 that dissipate energy by collision in the particle damping container 1 .

[0064] The difference from Example 1 or 3 is that Figure 3-5 As shown, in order to realize the sliding of the movable baffle 13 toward each other, the ball screw mechanism 5 of this embodiment includes a screw 51, a ball nut 52 and a motor 53. The screw 51 passes through the middle of the movable baffle 13, the ball nut 52 is connected and fixed to the middle of the movable baffle 13, and the motor 53 is used to drive the screw 51 to rotate. In this embodiment, the ball nut 52 on the same screw 51 rotates in opposite directions, so when the motor 53 drives the screw 51 to rotate, the collision spacing of each damping particle 2 is always the same during the movement of the movable baffle 13.

[0065] Embodiment 5:

[0066] This embodiment provides a semi-active modular bistable particle damper, including a particle damping container 1 and damping particles 2 that dissipate energy by collision in the particle damping container 1 .

[0067] The difference from Example 1 is that, in order to ensure that the bistable baffle 6 can produce a bistable deformation of elastic buckling under the collision of the damping particles 2, the thickness of the bistable baffle 6 of this embodiment is 1.5-3mm, the arrow height is 1.6 times the thickness, and the width is 1 / 2 of the diameter of the damping particles 2. It can not only realize the bistable deformation, but also constrain the bistable baffle 6 to only undergo first-order elastic instability.

[0068] like Figure 6-7 As shown, the bistable partition 6 of this embodiment is composed of a partition core 61 and a partition buffer layer 62 arranged on both sides of the partition core 61. The material of the partition core 61 is thermoplastic polyurethane, and the material of the partition buffer layer 62 is foamed polyurethane. The thickness of the partition buffer layers 62 on both sides is the same and is smaller than the thickness of the partition core 61. In each damping unit channel 4 at the initial stage of vibration, the unidirectional protrusions of the bistable partition 6 are alternately arranged in different directions to ensure that the energy dissipation capacity in the two directions is the same at the initial stage of vibration.

[0069] When the movement speed of the damping particles 2 is low, the damping particles 2 squeeze the partition buffer layer 62 of the bistable partition 6 to absorb a small amount of energy. When the movement speed of the damping particles 2 is high, the damping particles 2 collide with the bistable partition 6 to cause elastic instability and then transition between the first stable state and the second stable state to absorb a large amount of energy.

[0070] Embodiment 6:

[0071] This embodiment provides a semi-active modular bistable particle damper, including a particle damping container 1 and damping particles 2 that dissipate energy by collision in the particle damping container 1 .

[0072] The difference from Example 1 is that, in order to realize the semi-active control of the modular bistable particle damper, the modular bistable particle damper of this embodiment is also connected to a control system. The control system includes a first sensor, a second sensor and a controller. Figure 8 As shown, the first sensor is used to collect external excitation of the main structure, and the second sensor is used to collect the structural response of the main structure. The controller is used to receive and process the information collected by the first sensor and the second sensor, and control the ball screw mechanism 5 to change the position of the movable baffle 13, so that the collision distance of the damping particles 2 is always in the optimal state.

[0073] Embodiment 7:

[0074] This embodiment provides a semi-active modular bistable particle damper, which is specifically composed of 16 particle damping containers 1 that are laid flat and stacked together, and mainly controls vibration in a single horizontal direction.

[0075] Each particle damping container 1 includes a guide rod 14, a motor 53, a screw 51, a ball nut 52, a movable baffle 13, a bistable partition 6 and damping particles 2. The damping particles 2 are made of steel with a high density to ensure that the kinetic energy of the main structure is transferred to the damping particles 2 as much as possible, and when the momentum exchange of the collision occurs, the collision force as large as possible can be generated. Guide rods 14 are fixed on both sides of each particle damping container 1. A motor 53 is fixed at the center of the front end of each particle damping container 1, and the screw 51 is connected to the output end of the motor 53 and passes through the center of the particle damping container 1.

[0076] The particle damping container 1 of this embodiment is internally divided into a plurality of damping unit channels 4, and the width 9 of the damping unit channel 4 is equal to the diameter of the damping particle 2. A bistable partition 6 is provided in the center of the damping unit channel 4, and the bistable partition 6 is a buckling plate capable of generating negative stiffness, and two movable baffles 13 are provided at both ends of the damping unit channel 4. The damping particles 2 are placed in the damping unit channel 4 between the two sides of the bistable partition 6 and the movable baffles 13.

[0077] In this embodiment, the movable baffle 13 spans across multiple damping unit channels 4, the guide rod 14 passes through the end of the movable baffle 13, and the screw rod 51 passes through the center of the movable baffle 13. The center of the movable baffle 13 is fixed to the ball nut 52, and the ball nuts 52 connected to the two movable baffles 13 have opposite rotation directions. The ball nut 52, the screw rod 51 and the motor 53 are combined into a ball screw mechanism.

[0078] The thickness of the bistable partition 6 of this embodiment is 2 mm, the sagittal height is about 1.6 times the thickness, and the width of the bistable partition 6 is 1 / 2 of the particle diameter to ensure that the bistable partition 6 can produce a bistable deformation of elastic buckling under the collision of the damping particles 2. The bistable partition 6 is composed of a partition core 61 and a partition buffer layer 62. The material of the partition core 61 is thermoplastic polyurethane, and the material of the partition buffer layer 62 is foamed polyurethane. The unidirectional protrusions of the bistable partition 6 are alternately arranged in different directions to ensure that the energy dissipation capacity in the two directions is the same at the initial stage of vibration.

[0079] Specifically, when the main structure vibrates, the damping particles 2 in the particle damping unit 1 move relative to the particle damping container 1 due to inertia. The two damping particles 2 in the damping unit channel 4 reciprocate between the bistable partition 6 and the movable baffle 13. When the damping particles 2 move at a low speed, they absorb a small amount of energy by squeezing the foamed polyurethane buffer layer on the bistable partition 6; when the damping particles 2 move at a high speed, the bistable partition 6 produces elastic instability, deforms from one stable state to another, and absorbs a large amount of energy. Since there are only two damping particles 2 on both sides of the bistable partition 6, the collision between the two damping particles 2 and the bistable partition 6 always occurs alternately, so that the transition between the stable states can occur repeatedly.

[0080] In this embodiment, thermoplastic polyurethane is used to make the bistable partition core 61 to realize a graded energy consumption mechanism. Thermoplastic polyurethane has a low elastic modulus and good toughness, and is not easily damaged after repeated buckling. Whether the buckling plate can achieve the bistable characteristic is related to the ratio of its sagitta and thickness. The sagitta of the bistable partition 6 is 1.6 times its thickness, which can not only achieve bistable state, but also constrain the bistable partition to only have first-order elastic instability (the bistable partition 6 has only one unidirectional protrusion and is located in the center). At this time, the deformation of the bistable partition 6 caused by the transition between stable states has little effect on the particle collision distance, so the deformation of the bistable partition 6 can be ignored when semi-active control is performed to adjust the baffle position. The foamed polyurethane buffer layer on both sides of the bistable partition 6 can not only increase the energy consumption when the particle movement speed is relatively small, reduce the noise of collision, but also increase the energy consumption generated by the bistable partition 6 when it transitions between stable states.

[0081] The control system block diagram of this embodiment is as follows Figure 8 As shown. The external excitation is obtained by the installed first sensor, the dynamic response of the main structure is obtained by the installed second sensor, the uncontrolled structure response is calculated by the external excitation, and then compared with the actual control structure response to determine whether the target control function is met. The controller controls the motor 53 to rotate according to the comparison result, drives the lead screw 51 to rotate, and changes the position of the movable baffle 13, so that the particle collision distance is always in the optimal state. Since the two ball nuts 52 connected to the movable baffle 13 rotate in opposite directions, the movable baffles 13 in the same damping unit channel 4 move toward each other, so the collision distance of each damping particle 2 is always the same during the movement of the movable baffle 13. By changing the position of the movable baffle 13, the collision distance of the damping particles 2 is always kept optimal under different excitations. When the optimal collision distance is reached, the most "beneficial collisions" and the least "harmful collisions" can be generated, thereby further improving the vibration reduction effect to achieve semi-active control.

[0082] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A semi-active modular bistable particle damper, comprising a particle damping container (1) and damping particles (2) for colliding and consuming energy in the particle damping container (1), characterized in that: The particle damping container (1) comprises side plates (11), a plurality of partition plates (12) arranged between the side plates (11), and a pair of movable baffles (13) capable of spanning and passing through the partition plates (12); The partition plate (12) divides the particle damping container (1) into a control unit channel (3) located in the middle and damping unit channels (4) located on both sides of the control unit channel (3); wherein a ball screw mechanism (5) for driving two movable baffles (13) to move toward each other is provided in the control unit channel (3); a bistable partition plate (6) is provided between adjacent partition plates (12) of the damping unit channel (4), and damping particles (2) are provided between the bistable partition plate (6) and the movable baffle plate (13) on the corresponding side; The bistable diaphragm (6) is a buckling plate capable of generating negative stiffness and having a unidirectional protrusion. The bistable diaphragm (6) can generate elastic buckling under the collision of the damping particles (2) and repeatedly transition between a first stable state and a second stable state.

2. A semi-active modular bistable particle damper according to claim 1, characterized in that: The modular bistable particle damper is composed of a plurality of particle damping containers (1) which are horizontally laid and / or vertically stacked.

3. A semi-active modular bistable particle damper according to claim 1, characterized in that: The damping particles (2) are spherical metal particles, and the diameter of the damping particles (2) is adapted to the width of the damping unit channel (4).

4. A semi-active modular bistable particle damper according to claim 1, characterized in that: A pair of guide rods (14) are provided between the side plates (11), and the guide rods (14) respectively pass through the ends of the movable baffles (13) and are connected to the side plates (11) on the corresponding sides; Both ends of the partition plate (12) are provided with sliding grooves for the movable baffle plate (13) to move.

5. A semi-active modular bistable particle damper according to claim 1, characterized in that: The ball screw mechanism (5) comprises a screw (51) penetrating the middle of the movable baffle (13), a ball nut (52) connected to the middle of the movable baffle (13), and a motor (53) for driving the screw (51) to rotate, wherein the ball nuts (52) on the same screw (51) rotate in opposite directions.

6. A semi-active modular bistable particle damper according to claim 1, characterized in that: The thickness of the bistable partition (6) is 1.5-3 mm, the sagittal height is 1.4-1.7 times the thickness, and the width is 1 / 2-2 / 3 of the diameter of the damping particles (2).

7. A semi-active modular bistable particle damper according to claim 1, characterized in that: The bistable partition (6) is composed of a partition inner core (61) and a partition buffer layer (62) arranged on both sides of the partition inner core (61); The material of the partition inner core (61) is thermoplastic polyurethane, and the material of the partition buffer layer (62) is foamed polyurethane.

8. A semi-active modular bistable particle damper according to claim 7, characterized in that: When the movement speed of the damping particles (2) is relatively low, the damping particles (2) press the partition buffer layer (62) of the bistable partition (6) to absorb a small amount of energy; When the movement speed of the damping particles (2) is relatively high, the damping particles (2) collide with the bistable partition (6) to cause elastic instability and then transition between the first stable state and the second stable state, thereby absorbing a large amount of energy.

9. A semi-active modular bistable particle damper according to claim 1, characterized in that: In each damping unit channel (4) at the initial stage of vibration, the unidirectional protrusions of the bistable partition (6) are alternately arranged in different directions.

10. A semi-active modular bistable particle damper according to claim 1, characterized in that: The modular bistable particle damper is also connected to a control system; The control system comprises a first sensor, a second sensor and a controller; wherein the first sensor is used to collect external excitation of the main structure, and the second sensor is used to collect the structural response of the main structure; the controller is used to receive and process the information collected by the first sensor and the second sensor, and control the ball screw mechanism (5) to change the position of the movable baffle (13), thereby ensuring that the collision distance of the damping particles (2) is always in an optimal state.

Images