A semi-active modular bistable particle damper

Abstract

The present invention relates to a semi-active modular bistable particle damper, comprising a particle damping container and damping particles; the particle damping container comprises side panels, a partition disposed between the side panels, and a movable baffle capable of passing through the partition panels; the partition panels separate the particle damping container into a control unit channel and a damping unit channel, a ball screw mechanism being disposed within the control unit channel, a bistable partition being disposed between adjacent partition panels of the damping unit channel, and damping particles being disposed between the bistable partition and the movable baffle. The bistable partition is a buckling plate capable of generating negative stiffness and having a unidirectional protrusion that can generate elastic buckling under the collision of damping particles and repeatedly transition between a first stable state and a second stable state. Compared to the prior art, the present invention utilizes a bistable negative stiffness partition to increase the energy dissipation of particle collisions, thereby achieving semi-active control based on particle damping.

Description

Technical Field

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

[0002] A particle damper is a nonlinear damper that primarily relies on collision and friction to exert control force on the main structure and dissipate energy. It has the advantages of high robustness and a wide vibration damping bandwidth, and is commonly used for vibration control in the fields of machinery, aviation, and civil engineering. Particle dampers generate momentum exchange through collisions, transferring energy from the main structure to the particles. Research has found that particle collisions can be divided into "beneficial collisions" and "harmful collisions." The former occurs when the particle velocity is opposite to the main structure's velocity, which helps control vibrations, while the latter occurs when the particle velocity is in the same direction as the main structure's velocity and may amplify the main structure's vibrations.

[0003] Research has found an optimal collision spacing for particle dampers. Too small a spacing increases "harmful collisions," while too large a spacing reduces "beneficial collisions." Therefore, when the particle damper spacing is at the optimal collision spacing, its vibration damping effect is optimal. However, this optimal collision spacing is related to the vibration response of the main structure, which varies under different excitations. Traditional particle dampers, as passive control devices, are unable to automatically adjust the collision spacing based on different excitations.

[0004] Furthermore, the container and particles of a particle damper are typically made of metal, sometimes with a cushioning material covering the inner wall of the container or the surface of the particles. Given the materials of the colliding particles and the container, momentum exchange and energy dissipation are in a trade-off relationship: when energy dissipation is high, particle motion is hindered; when particle motion is more intense, energy dissipation is reduced. Consequently, particle dampers with cushioning material struggle to fully function at low amplitudes, while particle dampers without cushioning material take longer to stop particle motion at higher amplitudes. Both scenarios result in less than ideal collision energy dissipation efficiency, and covering the particles with cushioning material also presents production challenges.

[0005] Therefore, in order to solve the technical problems of the above-mentioned particle damper, such as the unchangeable collision spacing and 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 such as the fixed collision distance and low collision energy consumption efficiency.

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

[0008] A semi-active modular bistable particle damper includes a particle damping container and damping particles that dissipate energy by collision within the particle damping container. The particle damping container includes side plates, a plurality of partition plates disposed between the side plates, and a pair of movable baffles capable of spanning and passing 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 located on both sides of the control unit channel; wherein a ball screw mechanism is provided in the control unit channel for driving two movable baffles to move toward each other; bistable partition plates are provided between adjacent partition plates of the damping unit channels, and damping particles are provided 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 baffles 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 separator is 1.5-3 mm.

[0017] Furthermore, the sag 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 separator is composed of a separator core and separator buffer layers arranged on both sides of the separator 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 damping particles move at a low speed, they squeeze the baffle buffer layer of the bistable baffle to absorb a small amount of energy. When the damping particles move at a high speed, they collide with the bistable baffle, causing elastic instability and transition between the first stable state and the second stable state, absorbing 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 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 to change the position of the movable baffle, so 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, thereby impacting the bistable partition to cause elastic buckling and repeated transitions between the first and second stable states, thereby achieving continuous energy dissipation. Therefore, the present invention utilizes the bistable negative stiffness partition to increase the energy dissipation of particle collisions, while simultaneously solving the problems of conventional particle dampers such as the fixed collision spacing and the difficulty in controlling the "optimal collision" ratio, thereby achieving 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, deforming from one stable state to another, and absorbing a large amount of energy.

[0029] (3) The bistable baffle of the present invention not only achieves bistable state, but also constrains the bistable baffle to only first-order elastic instability by regulating the ratio of the bistable baffle's height to thickness. Furthermore, the deformation of the bistable baffle during transitions between stable states has little effect on the particle collision distance. Therefore, the deformation of the bistable baffle can be ignored when semi-actively controlling the baffle position. The baffle buffer layers on both sides of the bistable baffle not only increase energy consumption when the particle movement speed is relatively low and reduce collision noise, but also increase energy consumption during transitions between stable states by closing and opening the pores within 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 an optimal state under different excitations, thereby generating more "beneficial collisions" and minimizing "harmful collisions", thereby improving the vibration reduction effect and achieving semi-active control. Other semi-active control schemes may involve changing temperature, changing the magnetic field, etc., while the present invention uses mechanical means to achieve semi-active control, which has 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 consumption 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 better vibration reduction effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the modular bistable particle damper of the present invention.

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

[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 2 is a cross-sectional view of a bistable separator according to the present invention.

[0038] Figure 7 Schematic diagram of the bistable state of the bistable separator of the present invention.

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

[0040] Description of the marks 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 separator, 61-separator core, 62-separator buffer layer. DETAILED DESCRIPTION

[0047] The present invention is described in detail below with reference to 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", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance; in addition, unless otherwise expressly 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, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled 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, it does not require further definition or explanation in subsequent drawings.

[0050] Example 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 includes side panels 11, a plurality of partition panels 12 disposed between the side panels 11, and a pair of movable baffles 13 capable of spanning and passing through the partition panels 12. The partition panels 12 divide the particle damping container 1 into a control unit channel 3 located in the center and damping unit channels 4 disposed on either side of the control unit channel 3. In this embodiment, a ball screw mechanism 5 is disposed within the control unit channel 3 for driving the two movable baffles 13 to move toward each other.

[0053] In this embodiment, bistable partitions 6 are positioned between adjacent partitions 12 of the damping unit channels 4. Damping particles 2 are positioned between the bistable partitions 6 and the corresponding movable baffles 13. Each bistable partition 6 in each damping unit channel 4 is a buckling plate capable of generating negative stiffness and has a unidirectional protrusion. The bistable partitions 6 are capable of elastically buckling under the impact of the damping particles 2 and repeatedly transitioning between a first stable state and a second stable state.

[0054] When the main structure vibrates, the damping particles 2 in the particle damper 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. This impacts the bistable partition 6, causing it to elastically buckle and repeatedly transition between the first and second stable states, thereby achieving continuous energy dissipation. This embodiment also controls the ball screw mechanism 5 to change the position of the movable baffle 13, ensuring that the collision spacing between the damping particles 2 is always optimal, resulting in more "beneficial collisions" and improving the vibration reduction effect, achieving semi-active control.

[0055] Example 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 number of particle damping containers 1 laid horizontally and / or stacked vertically, each of which includes a number of damping unit channels 4. Because the energy dissipation mechanism within each particle damping container 1 is consistent, the particle damping containers 1 can be stacked, horizontally expanded, or rotated to meet the vibration reduction requirements of different main structures, thereby achieving better vibration reduction effects.

[0058] In order to ensure that the kinetic energy of the main structure is transferred to the modular bistable particle damper of this embodiment as much as possible, and to generate the greatest possible collision force when momentum exchange occurs during a collision, the damping particles 2 of this embodiment are spherical metal particles with a relatively high 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] Example 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] This embodiment differs from Example 1 in that a pair of guide rods 14 are provided between the side panels 11. These guide rods 14 are symmetrically located at the ends of the particle damping container 1. Each guide rod 14 passes through the ends of the movable baffles 13 and connects to the corresponding side panels 11. To facilitate the sliding movement of the movable baffles 13, sliding grooves are provided at both ends of the partition plate 12 for the movable baffles 13 to move.

[0062] Example 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, to achieve the sliding movement of the movable baffle 13, the ball screw mechanism 5 of this embodiment includes a screw 51, a ball nut 52, and a motor 53. The screw 51 extends through the middle of the movable baffle 13, the ball nut 52 is fixedly connected 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 nuts 52 on the same screw 51 rotate in opposite directions. Therefore, when the motor 53 drives the screw 51 to rotate, the collision distance between each damping particle 2 remains the same during the movement of the movable baffle 13.

[0065] Example 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 partition 6 can produce bistable deformation of elastic buckling under the collision of the damping particles 2, the thickness of the bistable partition 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 achieve bistable deformation, but also constrain the bistable partition 6 to only undergo first-order elastic instability.

[0068] like Figure 6-7 As shown, the bistable partition 6 of this embodiment consists of a partition core 61 and partition buffer layers 62 disposed on either side of the partition core 61. The partition core 61 is made of thermoplastic polyurethane, while the partition buffer layers 62 are made of foamed polyurethane. The thickness of the partition buffer layers 62 on both sides is identical and smaller than that of the partition core 61. In the initial stages of vibration, the unidirectional protrusions of the bistable partition 6 are alternately arranged in different directions in each damping unit channel 4 to ensure equal energy dissipation in both directions during the initial stages of vibration.

[0069] When the damping particles 2 move at a low speed, they squeeze the baffle buffer layer 62 of the bistable baffle 6, absorbing a small amount of energy. When the damping particles 2 move at a high speed, they collide with the bistable baffle 6, causing elastic instability and transition between the first stable state and the second stable state, absorbing a large amount of energy.

[0070] Example 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 further 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 excitations from 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 and second sensors, and control the ball screw mechanism 5 to change the position of the movable baffle 13, thereby maintaining the collision spacing of the damping particles 2 at an optimal state.

[0073] Example 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 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 high-density steel to ensure that the kinetic energy of the main structure is transferred to the damping particles 2 as much as possible, and to generate the greatest possible collision force when momentum exchange occurs during a collision. Guide rods 14 are fixed on both sides of each particle damping container 1. A motor 53 is fixed to the center of the front end of each particle damping container 1. A 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 several damping unit channels 4, each with a width 9 equal to the diameter of the damping particles 2. Each damping unit channel 4 is centrally located with a bistable baffle 6, a buckling plate capable of generating negative stiffness. Two movable baffles 13 are located at each end of the damping unit channel 4. The damping particles 2 are positioned within the damping unit channel 4, between the movable baffles 13 and the two sides of the bistable baffle 6.

[0077] In this embodiment, the movable baffle 13 spans across multiple damping unit channels 4. The guide rod 14 passes through the ends of the movable baffle 13, and the screw 51 passes through the center of the movable baffle 13. The center of the movable baffle 13 is fixed to a ball nut 52, and the ball nuts 52 connecting the two movable baffles 13 rotate in opposite directions. The ball nut 52, screw 51, and motor 53 together form a ball screw mechanism.

[0078] In this embodiment, the bistable partition 6 has a thickness of 2 mm and a rise of approximately 1.6 times its thickness. Its width is half the particle diameter, ensuring that it can produce a bistable deformation, resulting in elastic buckling, upon impact with the damping particles 2. The bistable partition 6 consists of a partition core 61 and a partition buffer layer 62. The partition core 61 is made of thermoplastic polyurethane, while the partition buffer layer 62 is made of foamed polyurethane. The unidirectional protrusions of the bistable partition 6 are arranged alternately in different directions to ensure equal energy dissipation in both directions during the initial vibration phase.

[0079] Specifically, when the main structure vibrates, the damping particles 2 within the particle damping unit 1 undergo relative motion with 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 cushioning layer on the bistable partition 6. When the damping particles 2 move at a high speed, the bistable partition 6 undergoes elastic instability, deforming from one stable state to the other, absorbing a large amount of energy. Because there are only two damping particles 2 on either side of the bistable partition 6, the collisions between the two damping particles 2 and the bistable partition 6 always occur alternately, allowing the transition between stable states to occur repeatedly.

[0080] In this embodiment, the bistable partition core 61 is made of thermoplastic polyurethane 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 bistable characteristics is related to the ratio of its sagitta and thickness. The sagitta of the bistable partition 6 is 1.6 times its thickness, which not only can achieve bistability, but also can constrain the bistable partition to only undergo 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 performing semi-active control 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 and reduce the noise of the 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. A first sensor is installed to obtain external excitation, and a second sensor is installed to obtain the dynamic response of the main structure. The uncontrolled structure response is calculated based on the external excitation and then compared with the actual controlled structure response to determine whether it meets the target control function. Based on the comparison result, the controller controls the rotation of the motor 53, driving the screw 51 to rotate, changing the position of the movable baffle 13 to ensure that the particle collision distance is always optimal. Because 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. Therefore, the collision distance between each damping particle 2 remains 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 maintained at the optimal level under different excitations. When the optimal collision distance is reached, the maximum "beneficial collisions" and the minimum "harmful collisions" can be generated, further improving the vibration reduction effect and achieving semi-active control.

[0082] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. 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 absorbing 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); bistable partition plates (6) are provided between adjacent partition plates (12) of the damping unit channel (4), and damping particles (2) are provided between the bistable partition plates (6) and the movable baffle plates (13) on the corresponding sides; The bistable diaphragm (6) is a buckling plate capable of generating negative stiffness and has a unidirectional protrusion. The bistable diaphragm (6) can generate elastic buckling under the collision of the damping particles (2) and repeatedly jump 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) that are horizontally laid and / or vertically stacked.

3. The 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. The 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 (13) to move.

5. The semi-active modular bistable particle damper according to claim 1, characterized in that: The ball screw mechanism (5) comprises a screw rod (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 rod (51) to rotate, wherein the ball nuts (52) on the same screw rod (51) rotate in opposite directions.

6. The 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. The semi-active modular bistable particle damper according to claim 1, characterized in that: The bistable partition (6) is composed of a partition core (61) and a partition buffer layer (62) provided on both sides of the partition 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. The 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), causing elastic instability and transition between the first stable state and the second stable state, thereby absorbing a large amount of energy.

9. The 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. The 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.

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