Parallel type inerter magneto-rheological damping device

Abstract

The utility model relates to a parallel type inerter magneto-rheological damping device, which belongs to the technical field of structural damping control and comprises a magneto-rheological damping element, a ball screw inerter element and a connecting element. The magnetorheological damping element comprises a first cylinder barrel, an end cover, a working piston, a piston rod, a magnet exciting coil, magnetorheological fluid and an energy accumulator, wherein the magnetorheological fluid and the energy accumulator are located in the first cylinder barrel. The ball screw inerter element comprises a ball screw pair, a bearing, a bearing seat, a second cylinder barrel and a flywheel. The magneto-rheological damping element and the ball screw inerter element are combined through the connecting element to form a parallel structure. According to the scheme, the real-time controllable damping function of the magnetorheological fluid damping element and the inertia amplification effect of the ball screw inerter element are effectively utilized, the vibration reduction control frequency band is widened, the damping energy consumption effect is enhanced, meanwhile, adjustability is achieved, the adaptive capacity to external excitation is achieved, and multi-scene application is met.

Description

Technical Field

[0001] This utility model relates to the field of structural vibration reduction and control technology, specifically to a parallel inertial capacitive magnetorheological vibration reduction device. Background Technology

[0002] In recent years, inertial capacitive dampers, as a novel type of passive control device, have shown potential advantages in the efficient control of structural vibrations through different configurations formed by combining inertial containers, springs, and dampers. This is mainly attributed to the inertial mass enhancement mechanism of the inertial container and its frequency-dependent negative stiffness characteristics. However, like traditional passive dampers, passive inertial capacitive dampers can only provide the optimal damping ratio for a single mode of structural vibration, making it difficult to simultaneously achieve optimal control of multiple modes of vibration. Furthermore, passive inertial capacitive dampers cannot dynamically adjust their capacitive and damping coefficients, lacking adaptive control capabilities in response to changes in external loads.

[0003] Magnetorheological dampers possess advantages such as real-time adjustable damping characteristics, large dynamic range, low energy consumption, high reliability, and strong stability, making them one of the most effective semi-active control measures for structural vibration. They can provide superior control effects compared to passive dampers. However, as engineering structures and their components develop towards larger spans and greater heights, they exhibit high flexibility and multi-modal, wide-frequency vibration characteristics under multi-source environmental excitation. This presents new challenges for the application of magnetorheological dampers and for fully realizing their control potential.

[0004] In summary, to meet the higher engineering vibration reduction requirements brought about by the development of large-scale structures, by fully utilizing and exploring the potential advantages of inertial containers and magnetorheological dampers, as well as their organic combination and synergistic work, a new type of high-efficiency vibration control device can be developed to achieve energy efficiency and realize multi-modal, wide-frequency adaptive vibration control of flexible structures and their components. This will have significant engineering application value and broad application prospects. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a parallel inertial capacitive magnetorheological vibration reduction device, which improves the energy consumption efficiency of the magnetorheological damper and achieves better structural vibration reduction control effect by organically combining and coordinating the inertial container and the magnetorheological damper.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a parallel inertial capacitive magnetorheological vibration damping device, comprising:

[0007] Magnetorheological damping elements are used to provide controllable damping;

[0008] Ball screw inertial-capacitive elements are used to provide inertial effects;

[0009] Connecting elements are used to form a parallel vibration damping device.

[0010] Furthermore, the magnetorheological damping element includes a first cylinder and a working piston that moves axially within the first cylinder. The first cylinder is filled with magnetorheological fluid, and an annular damping channel for the flow of magnetorheological fluid is provided between the working piston and the inner wall of the first cylinder. A piston rod is fixedly connected to the working piston, and the top of the piston rod extends out of the first cylinder and is connected to a connecting element.

[0011] Furthermore, the outer wall of the working piston is recessed inward with an annular groove, and an excitation coil is wound inside the annular groove.

[0012] Furthermore, an accumulator is provided at the bottom of the first cylinder. The accumulator includes an energy storage piston whose outer wall is abutted against the inner wall of the first cylinder to block the magnetorheological fluid and moves with the piston of the first cylinder. An energy storage spring is abutted between the energy storage piston and the bottom of the first cylinder.

[0013] Furthermore, the first cylinder is provided with an end cap at the top, and the working piston extends through the end cap and is fixed to the connecting element.

[0014] Furthermore, the ball screw inertia-capacity element includes a second cylinder and a ball screw pair rotatably connected by a bearing. The nut of the ball screw pair is rotatably connected to the bearing to convert the linear motion of the screw into the rotational motion of the nut. One end of the nut passes through the second cylinder and is fixedly connected to a flywheel. One end of the lead screw of the ball screw pair is located inside the second cylinder, and the other end passes through the second cylinder and is connected to a connecting element.

[0015] Furthermore, the ball screw assembly consists of a screw, a nut, and balls, with the balls embedded between the screw and the nut.

[0016] Furthermore, the bearing is mounted on a bearing housing, and the bearing housing is fixedly connected to the second cylinder.

[0017] Furthermore, the first cylinder and the second cylinder are spaced apart and their bottoms are both fixed to the connecting element.

[0018] Furthermore, the connecting element includes a first connecting plate and a second connecting plate that respectively connect the top and bottom of the magnetorheological damping element and the ball screw inertia-capacitance element. The top end of the piston rod and the top end of the lead screw are both fixedly connected to the first connecting plate, and the bottom of the first cylinder and the second cylinder are both fixedly connected to the second connecting plate.

[0019] Furthermore, both the first cylinder and the second cylinder are hollow cylinders, and the piston rod and the lead screw are respectively coaxially arranged with the first cylinder and the second cylinder.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The concept and structure of inertial capacitance are introduced, and the magnetorheological damping element and the ball screw inertial capacitance element are organically combined in parallel so that the two work together, realizing the parallel configuration of damping and inertial capacitance in terms of mechanical principle.

[0022] 2. By utilizing the dynamic and reversible rheological effect of magnetorheological fluid under the action of a magnetic field, real-time control of damping force can be achieved, overcoming the shortcomings of existing passive dampers that have low damping effect and are difficult to adjust outside the design frequency. By implementing a semi-active control strategy on the magnetorheological damping element, a damping force with negative stiffness effect is generated, thereby improving damping performance.

[0023] 3. By utilizing ball screw inertial capacitance elements, the inertial effect can be amplified with a small physical mass, further increasing the actuating displacement of magnetorheological damping elements, significantly improving the energy dissipation capacity of magnetorheological damping elements, and generating negative stiffness inertial force proportional to the square of the excitation frequency, effectively widening the vibration reduction control bandwidth.

[0024] 4. By adjusting the current level of the excitation coil and changing the moment of inertia of the flywheel online, the equivalent damping coefficient and inertia coefficient of the vibration reduction device can be adjusted. This can overcome the lack of adaptive capability of traditional passive vibration reduction devices to external load changes and meet the application requirements of vibration reduction in engineering structures in multiple scenarios.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model.

[0027] In the diagram: 1-First cylinder, 2-End cap, 3-Working piston, 4-Piston rod, 5-Excitation coil, 6-Magnetorheological fluid, 7-Accumulator, 71-Accumulating piston, 72-Accumulating spring, 8-Ball screw pair, 81-Screw, 82-Nut, 83-Ball, 9-Bearing, 10-Bearing housing, 11-Second cylinder, 12-Flywheel, 13-First connecting plate, 14-Second connecting plate, 15-Connecting rod, 16-Annular groove, 17-Annular damping channel. Detailed Implementation

[0028] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0029] like Figure 1 As shown, a parallel inertial-capacitive magnetorheological damping device includes a magnetorheological damping element for providing controllable damping, a ball screw inertial-capacitive element for providing inertial effect, and connecting elements for forming the parallel damping device.

[0030] In this embodiment of the utility model, the magnetorheological damping element is a single-rod structure, including a first cylinder 1, an end cap 2, a working piston 3, a piston rod 4, an excitation coil 5, and a magnetorheological fluid 6 and an accumulator 7 located in the first cylinder 1.

[0031] In this embodiment of the invention, the first cylinder 1 is fixed to the end cap 2, forming a sealed chamber. Both the first cylinder 1 and the second cylinder have connecting rods 15 on their outer bottom ends, and the ends of these connecting rods are threaded externally, thus connecting to the second connecting rod via a thread.

[0032] In this embodiment of the invention, an accumulator 7 is provided at the bottom of the first cylinder 1. The accumulator 7 includes an energy storage piston 71 that can seal the liquid and float up and down, and an energy storage spring 72. The upper chamber of the energy storage piston 71 is filled with magnetorheological fluid 6. One end of the working piston 3 and the piston rod 4 are coaxially connected and coaxially fixed inside the first cylinder 1. The other end of the piston rod 4 extends out of the end cap 2, and the second end is threaded externally. An annular damping channel for the flow of magnetorheological fluid 6 is formed between the outer wall of the working piston 3 and the inner wall of the first cylinder 1. The outer wall of the working piston 3 is provided with an annular groove, and an excitation coil 5 is wound in the annular groove.

[0033] In this embodiment of the utility model, the ball screw inertia-capacity element includes a ball screw assembly 8, a bearing 9, a bearing housing 10, a second cylinder 11, and a flywheel 12.

[0034] In this embodiment of the invention, the ball screw assembly 8 includes a screw 81, a nut 82, and balls 83. The screw 81 and nut 82 are connected in a mating manner, and the balls 83 are embedded between the screw 81 and nut 82, reducing friction through rolling. The first end of the screw 81 is placed inside the second cylinder 11, and the second end extends out of the second cylinder 11, with external threads tapped at its end. The bearing 9 is adapted and installed on the bearing seat 10, which is fixedly connected to the second cylinder 11. The bearing 9 is adapted and connected to the outer wall of the nut 82 of the ball screw assembly 8, realizing the conversion of the linear motion of the screw 81 into the rotational motion of the nut 82. The flywheel 12 is connected to the nut 82 and rotates coaxially with the nut 82. The flywheel 12 is a detachable part, and its moment of inertia can be adjusted by changing the size and physical mass of the flywheel 12. The second cylinder 11 is a hollow cylinder, and its internal space serves as the stroke chamber for the ball screw assembly 8. The stroke of the ball screw assembly 8 is consistent with the stroke of the magnetorheological damping element. A connecting rod is provided on the outer side of the bottom end of the second cylinder 11, and the end of the connecting rod is threaded externally.

[0035] In this embodiment of the invention, the magnetorheological damping element and the ball screw inertia-capacitance element are combined through the connecting element to form a parallel structure. The connecting element includes a first connecting plate 13, a second connecting plate 14, and multiple locking nuts. Each of the first connecting plate 13 and the second connecting plate 14 has two through holes. The through holes of the first connecting plate 13 are respectively adapted to connect to the second end of the piston rod 4 and the second end of the lead screw 81, and are fixed to the second end of the piston rod 4 and the lead screw 81 by threaded connection using locking nuts. The through holes of the second connecting plate 14 are respectively adapted to connect to the connecting rods at the bottom ends of the first cylinder 1 and the second cylinder 11, and are fixed by threaded connection using locking nuts. A connecting screw is installed at the center of each of the first connecting plate 13 and the second connecting plate 14 for connection to the energy-dissipating structure. Rods can be provided on the first and second connecting plates to receive external excitation.

[0036] The working principle of this embodiment is as follows: When the two ends of the device are subjected to external excitation, the piston rod 4 drives the piston to reciprocate axially within the first cylinder 1. A pressure difference is formed in the chambers on both sides of the working piston 3, forcing the magnetorheological fluid 6 to flow reciprocally between the two chambers through the annular damping channel. This generates damping force in a shear valve-type working mode. Simultaneously, the accumulator 7 compensates for the volume change within the first cylinder 1 caused by the piston rod 4 entering and exiting the first cylinder 1. At the same time, the lead screw 81 generates axial relative motion, which is converted into the rotational motion of the nut 82 through the rolling of the ball 83. This motion drives the flywheel 12 to rotate coaxially. Due to the inertial mass of the flywheel 12, an axial inertial force is generated, achieving a greater inertial effect with a smaller physical mass. The combination of the magnetorheological damping element and the ball screw inertial capacitive element amplifies the damping energy dissipation capacity through inertia. When different levels of working current are applied to the excitation coil 5, the magnetic field strength in the damping channel changes accordingly, causing the rheological effect of the magnetorheological fluid 6 in the damping channel to change, thereby adjusting the damping force. By changing the physical mass of the flywheel 12, its inertial force can be changed to achieve the ideal vibration energy dissipation effect and broaden the application range of the vibration reduction device.

[0037] This utility model is not limited to the preferred embodiment described above. Anyone can derive other forms of parallel capacitive magnetorheological vibration damping devices based on the teachings of this utility model. All equivalent variations and modifications made within the scope of the claims of this utility model should be considered within the scope of this utility model.

Claims

1. A parallel inertial capacitive magnetorheological vibration damping device, characterized in that: It includes magnetorheological damping elements and ball screw inertial-capacitive elements, as well as connecting elements for connecting magnetorheological damping elements and ball screw inertial-capacitive elements in parallel. The ball screw inertia-capacity element includes a second cylinder and a ball screw assembly rotatably connected by a bearing. The nut of the ball screw assembly is rotatably connected to the bearing to convert the linear motion of the screw into the rotational motion of the nut. One end of the nut passes through the second cylinder and is fixedly connected to a flywheel. One end of the lead screw of the ball screw assembly is located inside the second cylinder, and the other end passes through the second cylinder and is connected to a connecting element.

2. The parallel inertial capacitive magnetorheological vibration damping device according to claim 1, characterized in that: The magnetorheological damping element includes a first cylinder and a working piston that moves axially within the first cylinder. The first cylinder is filled with magnetorheological fluid. An annular damping channel for the flow of magnetorheological fluid is provided between the working piston and the inner wall of the first cylinder. A piston rod is fixedly connected to the working piston, and the top of the piston rod extends out of the first cylinder and is connected to a connecting element.

3. The parallel inertial capacitive magnetorheological vibration damping device according to claim 2, characterized in that: The outer wall of the working piston is recessed inward with an annular groove, and an excitation coil is wound inside the annular groove.

4. The parallel inertial capacitive magnetorheological vibration damping device according to claim 2, characterized in that: An accumulator is provided at the bottom of the first cylinder. The accumulator includes an energy storage piston whose outer wall is abutted against the inner wall of the first cylinder to block the magnetorheological fluid and moves with the piston of the first cylinder. An energy storage spring is abutted between the energy storage piston and the bottom of the first cylinder.

5. A parallel inertial capacitive magnetorheological vibration damping device according to claim 2, characterized in that: The first cylinder has an end cap at the top, and the working piston passes through the end cap and is fixed to the connecting element.

6. The parallel inertial capacitive magnetorheological vibration damping device according to claim 1, characterized in that: The ball screw assembly consists of a screw, a nut, and balls, with the balls embedded between the screw and the nut.

7. The parallel inertial capacitive magnetorheological vibration damping device according to claim 1, characterized in that: The bearing is mounted on a bearing housing, and the bearing housing is fixedly connected to the second cylinder.

8. A parallel inertial capacitive magnetorheological vibration damping device according to claim 2, characterized in that: The first cylinder and the second cylinder are spaced apart and their bottoms are both fixed to the connecting element.

9. A parallel inertial capacitive magnetorheological vibration damping device according to claim 2, characterized in that: The connecting element includes a first connecting plate and a second connecting plate that respectively connect the top and bottom of the magnetorheological damping element and the ball screw inertia-capacitance element. The top of the piston rod and the top of the screw are both fixedly connected to the first connecting plate, and the bottom of the first cylinder and the second cylinder are both fixedly connected to the second connecting plate.

10. A parallel inertial capacitive magnetorheological vibration damping device according to claim 2, characterized in that: Both the first cylinder and the second cylinder are hollow cylinders, and the piston rod and the lead screw are respectively coaxially arranged with the first cylinder and the second cylinder.

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