Broadband tuning inerter damper oriented to multi-mode control and working method

Abstract

The invention provides a broadband tuning inerter damper oriented to multi-mode control and a working method, and relates to the technical field of vibration control, the broadband tuning inerter damper comprises a first cavity, a second cavity, a rotating shaft and a plurality of groups of cantilever beam type tuning mass damping structures; the cantilever beam type tuned mass damping structure comprises a cantilever beam and a tuned second-order mass block, one end of the cantilever beam is fixedly connected with the rotating shaft, and the other end of the cantilever beam is fixedly connected with the tuned second-order mass block; one end of the rotating shaft is rotationally connected with the first cavity, the other end of the rotating shaft is rotationally connected with the second cavity, and the rotating shaft and the second cavity can generate axial relative displacement; the multiple sets of cantilever beam type tuned mass damping structures are fixedly arranged at the position, located in the first cavity, of the rotating shaft, and tuned second-order masses of all the sets of cantilever beam type tuned mass damping structures are different. According to the invention, multiple vibration modes can be controlled at the same time, and the vibration control effect is improved.

Description

Technical Field

[0001] The present invention relates to the field of vibration control technology, and in particular to a broadband tuned inertia damper for multi-modal control and a working method thereof. Background Art

[0002] When a structure is subjected to environmental loads, vibrations often occur. If the vibration response is too large, it may cause component fatigue or even structural damage. Therefore, in order to improve the service performance of the structure and ensure its safety and reliability, it is particularly important to install vibration reduction devices to absorb or dissipate vibration energy and reduce the structural vibration response. As a commonly used passive control vibration reduction structure, the tuned mass damper absorbs external vibration energy through the resonance of the tuned mass and dissipates it into heat or other forms of energy, thereby effectively suppressing the vibration of the main structure. Its principle is based on the mechanism of vibration absorption and energy dissipation. It can absorb and dissipate the vibration energy of the structure at a specific design frequency, thereby improving the vibration control effect. It has the advantages of simple structure and high reliability.

[0003] However, traditional tuned mass dampers are typically designed and tuned for a single modal frequency of an engineering structure. This means they can only effectively control vibrations at a specific modal frequency. They are unable to effectively control structures with multiple modes, making it impossible to control complex vibrating structures. Furthermore, traditional tuned mass dampers typically require a large mass and stroke to achieve efficient vibration energy absorption. This makes them difficult to apply to some engineering structures, particularly those requiring compact space, such as bridges, and they cannot meet practical engineering requirements. Summary of the Invention

[0004] In order to address at least one of the shortcomings of the prior art, the purpose of the present invention is to provide a broadband tuned inertia damper and working method for multi-modal control, which has a compact structure and can act simultaneously on multiple vibration modes, thereby providing more comprehensive and efficient vibration reduction control for complex engineering structures.

[0005] To achieve the above objectives, according to some embodiments, a first aspect of the present invention provides a broadband tuned inertia damper for multi-modal control, comprising a first cavity, a second cavity, a rotating shaft, and multiple groups of cantilever beam-type tuned mass damping structures;

[0006] The cantilever beam type tuned mass damping structure includes a cantilever beam and a tuned second-order mass block, one end of the cantilever beam is fixedly connected to the rotating shaft, and the other end is fixedly connected to the tuned second-order mass block;

[0007] One end of the rotating shaft is rotatably connected to the first cavity, and the other end is rotatably connected to the second cavity, and can undergo axial relative displacement with the second cavity;

[0008] A plurality of groups of cantilever beam type tuned mass damping structures are fixedly arranged where the rotating shaft is located in the first cavity, and the tuned second-order mass of each group of cantilever beam type tuned mass damping structures is different.

[0009] The second aspect of the present invention provides a working method of a wide-band tuned inertia damper for multi-modal control based on the first aspect, including: when an external force causes the first cavity and the second cavity to move relative to each other along the axial direction of the rotating shaft, the second cavity drives the rotating shaft to rotate, and then drives the cantilever beam type tuned mass damping structure on the rotating shaft to rotate, so that the cantilever beam type tuned mass damping structure resonates at the corresponding target frequency and absorbs the vibration energy at the target frequency.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The present invention provides a broadband tuned inertia damper and operating method for multi-modal control. By introducing a cantilever beam tuned mass damping structure within the inertia container, the requirements for large mass and large stroke of traditional tuned mass dampers are effectively reduced, making the vibration control device more compact and easier to integrate. This not only improves the space utilization efficiency of the device, but also enables it to adapt to narrower and more complex engineering structures, such as bridges and other space-constrained engineering applications. At the same time, by designing multiple groups of cantilever beam tuned mass damping structures with different tuned second-order masses, different tuned second-order masses correspond to different target modal frequencies, thus achieving effective control of multi-modal vibrations. This allows the damper to simultaneously reduce vibrations in multiple vibration modes, meeting the vibration control requirements of complex engineering structures within multiple frequency ranges, thereby providing a more comprehensive vibration control effect.

[0012] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic diagram of the overall structure of a broadband tuned inertia damper for multi-modal control provided by an embodiment of the present invention;

[0015] Figure 2 for Figure 1 AA section view in;

[0016] Among them, the figure marks respectively represent: 11, tuned second-order mass block; 12, cantilever beam; 13, bolt; 14, rotating shaft; 15, left ball bearing; 16, right ball bearing; 21, first cavity; 22, external thread; 23, ball screw nut; 24, second cavity; 25, left end; 26, right end. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0018] The terms "first", "second", etc. in the description of the present invention are used to distinguish different objects, rather than to describe a specific order. Terms such as "upper" and "lower" that indicate orientation are described based on the positional relationship of each part of the structure under normal use. They are only used to describe the relative positional relationship and do not necessarily indicate a limitation on orientation. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0019] In the description of the present invention, "plurality" means two or more. Unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0020] The embodiment of the present invention provides a broadband tuned inertia damper and a working method for multi-modal control, which is mainly used for vibration control of engineering structures, such as Figure 1-Figure 2 As shown, the broadband tuned inertia damper for multi-modal control includes a first cavity 21, a second cavity 24, a rotating shaft 14 and a plurality of cantilever beam type tuned mass damping structures.

[0021] The cantilever beam type tuned mass damping structure includes a cantilever beam 12 and a tuned second-order mass block 11. One end of the cantilever beam 12 is fixedly connected to the rotating shaft 14, and the other end is fixedly connected to the tuned second-order mass block 11.

[0022] One end of the rotating shaft 14 is rotatably connected to the first cavity 21, and the other end is rotatably connected to the second cavity 24, and the rotating shaft 14 can be axially displaced relative to the second cavity 24;

[0023] A plurality of groups of cantilever beam type tuned mass damping structures are fixedly arranged at the position where the rotating shaft 14 is located in the first cavity 21 , and the tuned second-order mass of each group of cantilever beam type tuned mass damping structures is different.

[0024] To address the structural and operating characteristics limitations of traditional tuned mass dampers, embodiments of the present invention provide a novel broadband tuned inertial container damper and operating method. The main improvements are: first, the present invention introduces a cantilever beam tuned mass damping structure within the inertial container. This design effectively absorbs vibration energy by combining the cantilever beam tuned mass damping structure with the resonance tuning of the inertial container. Compared with traditional tuned mass dampers, the device is smaller in mass and more compact in structure, greatly improving the compactness and integration of the device. Second, the present invention achieves multi-modal tuned vibration reduction through a multi-frequency resonance design. Multiple groups of cantilever beam tuned mass damping structures are arranged within the damper, and each group of cantilever beam tuned mass damping structures has a different second-order mass, thereby effectively tuning and reducing vibrations at multiple modal frequencies simultaneously. The rotating axis within the first cavity accommodates multiple cantilever beam-type tuned mass damping structures. Each cantilever beam has identical dimensions but differs in its second-order tuned mass. By adjusting the second-order tuned mass of each cantilever beam-type tuned mass damping structure, the resonant frequency of each cantilever beam-type tuned mass damping structure is varied. This design enables the device to operate simultaneously in multiple vibration modes, providing efficient vibration damping across multiple frequency ranges, thereby providing more comprehensive and efficient vibration control for complex engineering structures. Furthermore, the present invention significantly enhances the energy dissipation capacity of the tuned mass damper by leveraging the dual amplification effect of the inertia chamber. By combining the inertia chamber with the tuned mass damper, the present invention fully utilizes the amplification effect of the inertia chamber, effectively improving the performance of conventional tuned mass dampers. A ball screw assembly converts linear motion into high-speed rotational motion, further amplifying the vibration of the cantilever beam tuned mass damping structure and generating greater inertial force. Furthermore, the ball screw assembly amplifies the second-order mass of the cantilever beam tuned mass damping structure, thereby generating a negative stiffness effect. The negative stiffness effect can promote the movement of the damper and further enhance its energy dissipation capacity, thereby significantly improving the vibration control effect.

[0025] The damper is provided with terminals connected to the external structure at both ends. Figure 1 Take the direction shown as an example, Figure 1The left end is referred to as the left end 25, and the right end is referred to as the right end 26. It should be understood that the "left" and "right" orientations do not limit the structure itself. The left end 25 is fixedly connected to the end of the first cavity 21 away from the rotation axis 14. The right end 26 is fixedly connected to the end of the second cavity 24 away from the rotation axis 14.

[0026] The first cavity 21 is hollow and accommodates the cantilever-type tuned mass damping structure. The rotating shaft 14 is connected to the inner wall of the first cavity 21 via left and right ball bearings 15 and 16, ensuring that only rotational motion occurs between the rotating shaft and the first cavity, avoiding linear motion.

[0027] Multiple groups of cantilever beam-type tuned mass damping structures are fixedly mounted on the outer wall of the portion of the rotating shaft 14 located within the first cavity 21. Each group of cantilever beam-type tuned mass damping structures has the same structure but different tuned second-order masses. The cantilever beam-type tuned mass damping structures include a cantilever beam 12 and a tuned second-order mass block 11. The tuned second-order mass block 11 is fixed to the cantilever beam 12 at one end via bolts 13, thereby forming a cantilever beam structure. The tuned second-order mass block 11 is rigidly connected to the rotating shaft 14 via the cantilever beam 12, ensuring that it can rotate synchronously with the rotating shaft, thereby achieving tuned resonance under the action of external forces.

[0028] The device of the present invention is capable of suppressing multi-modal vibrations and performing effective control, so it is necessary to adjust multiple cantilever beam type tuned mass dampers to different target modal frequencies. The tuned second-order mass between each group of cantilever beam type tuned mass damping structures can be changed by changing the mass of the tuned second-order mass block 11, or by changing the number of the tuned second-order mass blocks 11. In this embodiment, the mass of each tuned second-order mass block 11 is the same, but the number of tuned second-order mass blocks between different groups of cantilever beam type tuned mass damping structures is different. At this time, the geometric dimensions of the cantilever beam 12 of each group of cantilever beam type tuned mass damping structures remain consistent, and the resonant frequency of each group is adjusted by changing the number of tuned second-order mass blocks in the cantilever beam type tuned mass damping structure. For example, in Figure 1 In the structure shown, in the three groups of cantilever beam-type tuned mass damping structures, from left to right, the number of tuned second-order mass blocks is one, two, and three, respectively, so as to achieve resonance at different target modal frequencies.

[0029] In addition, each group of cantilever beam type tuned mass damping structures may also correspond to multiple cantilever beam type tuned mass damping structures with the same tuned second-order mass, and the multiple cantilever beam type tuned mass damping structures are evenly distributed along the circumference of the rotating axis. Figure 2As shown, in this embodiment, the cantilever beam-type tuned mass damping structures are arranged symmetrically around the rotation axis, with each group comprising four tuned mass damping structures. Through this design, multiple groups of cantilever beam-type tuned mass damping structures are tuned to different target modal frequencies. Under the action of an external force, the rotational motion of the rotation axis drives the tuned second-order mass blocks through the cantilever beams. Each group of tuned second-order mass blocks will resonate at its respective target modal frequency, effectively absorbing and dissipating vibration energy at the target modal frequency.

[0030] Only relative rotation but no relative displacement can occur between the rotating shaft 14 and the first cavity 21; while both relative rotation and relative displacement can occur between the rotating shaft 14 and the second cavity 24. Therefore, when external vibration occurs, the relative displacement between the left end 25 and the right end 26 can be converted into rotational motion of the rotating shaft, thereby driving the cantilever beam type tuned mass damping structure to rotate and achieve vibration reduction.

[0031] Specifically, the portion of the rotating shaft 14 that extends beyond the first cavity 21 has an outer surface that is designed as a screw and has external threads 22. The external threads 22 extend to the end of the rotating shaft 14 away from the first cavity 21. A ball screw is used to connect the rotating shaft 14 and the second cavity 24. A ball screw nut 23 is rigidly connected to the interior of the second cavity and is sleeved on the external threads 22 of the rotating shaft 14 to achieve a threaded connection. When an external force acts on the second cavity, the linear motion of the second cavity in the axial direction of the rotating shaft can be converted into rotational motion of the rotating shaft.

[0032] In some embodiments, energy dissipation characteristics can be further enhanced by adding a viscous fluid. For example, by adding a viscous fluid to the first cavity and / or the second cavity (preferably to the first cavity), the system's energy dissipation capacity can be further enhanced by leveraging the interaction between the cantilever-beam tuned mass damper and the rotating shaft during motion. The addition of a viscous fluid can effectively improve the energy dissipation efficiency of the shock absorber.

[0033] Furthermore, the viscous liquid can also be a magnetorheological fluid. In this case, a conductive coil can be further added to the outer surface of the corresponding first cavity and / or second cavity, and the viscosity of the magnetorheological fluid can be changed by controlling the current in the coil, thereby achieving active control of vibration reduction energy consumption.

[0034] The embodiment of the present invention provides a broadband tuned inertia damper for multimodal control. Its core lies in the dual amplification effect provided by the inertia damper, which specifically includes two aspects: a motion amplification effect that converts linear motion into rotational motion, and a mass amplification effect. When the left and right ends undergo relative motion under the action of an external force, the horizontal linear motion is converted into high-speed rotational motion of the rotating shaft via a ball screw assembly, thereby driving the rotational motion of the cantilever beam-type tuned mass damper structure rigidly connected to the rotating shaft. In other words, under the action of the external force, the rotational motion of the cantilever beam-type tuned mass damper structure is amplified. Furthermore, due to the high-speed rotation of the rotating shaft and the cantilever beam-type tuned mass damper structure, they generate a rotational moment of inertia, forming an amplification effect of the tuned second-order mass, i.e., an apparent mass, resulting in a negative stiffness effect. This negative stiffness effect promotes the rotational motion of the cantilever beam-type tuned mass damper structure, further enhancing its energy absorption and dissipation capabilities, and significantly improving the vibration control effect.

[0035] The embodiment of the present invention further provides a method for operating the broadband tuned inertia damper for multi-modal control, including:

[0036] When an external force causes the first cavity and the second cavity to move relative to each other along the axial direction of the rotating shaft, the second cavity drives the rotating shaft to rotate, and then drives the cantilever beam type tuned mass damping structure on the rotating shaft to rotate, so that the cantilever beam type tuned mass damping structure resonates at the corresponding target frequency, thereby absorbing the vibration energy at the target frequency.

[0037] Specifically, when an external force causes the left end and the right end to move away from or approach each other, relative motion occurs between the first cavity and the second cavity. The second cavity drives the rotating shaft to move through the ball screw nut, converting the linear motion into rotational motion, causing the rotating shaft to rotate at high speed. At the same time, the cantilever beam is rigidly connected to the rotating shaft and drives the tuned second-order mass block to rotate. Due to the stiffness of the cantilever beam, during the rotation process, the tuned second-order mass block vibrates relative to the rotating shaft, thereby amplifying its rotational motion. The tuned second-order mass block, the cantilever beam and the rotating shaft are driven by the rotation of the ball screw, generating a large rotational moment of inertia during the rotation process, forming a mass amplification effect, and thus generating a negative stiffness effect. The negative stiffness effect further promotes the rotational motion, significantly enhancing the energy absorption and dissipation capacity of the system, thereby significantly improving the vibration control effect.

[0038] In an embodiment of the present invention, a cantilever beam tuned mass damping structure is introduced into the interior of the inertial container, which can effectively tune and reduce vibrations of multiple modal frequencies at the same time. Multiple groups of cantilever beam tuned mass damping structures can be installed on the rotating shaft of the inertial container. The cantilever beams of each group are of the same size. By adjusting the tuned second-order mass of each group, the resonant frequency of each group of tuned mass damping structures is changed. Each group of tuned mass damping structures can be independently tuned to a single modal frequency. Under the action of an external force, the linear motion is converted into the rotational motion of the cantilever beam tuned mass damping structure and resonates with the target frequency, thereby achieving vibration energy absorption and dissipation of the target modal frequency. By combining multiple groups of tuned mass damping structures and tuning them to different target modal frequencies, the device can function simultaneously on multiple vibration modes, thereby achieving vibration control of the engineering structure at multiple modal frequencies.

[0039] Compared with the existing technology, the embodiment of the present invention provides a broadband tuned inertia damper for multi-modal control, which has the following technical advantages:

[0040] (1) The compactness and integration of the device are improved.

[0041] By introducing a cantilever-beam tuned mass damper (TMD) structure within the inertial vessel, the large mass and stroke requirements of traditional TMDs are reduced, making the vibration control device more compact and easier to integrate. This design not only improves the device's space efficiency but also enables it to be adapted to smaller and more complex engineering structures, such as bridges, where space is limited.

[0042] (2) Significantly enhanced vibration energy absorption and dissipation capabilities.

[0043] The present invention utilizes the dual amplification effect of the inertia chamber to convert linear motion into rotational motion through a ball screw assembly, and enhances the energy dissipation capacity of the tuned mass damper through the negative stiffness effect. This not only significantly improves the vibration energy absorption capacity of traditional tuned mass dampers, but also enables the system to effectively control a wider range of vibration frequencies, thereby improving the overall shock absorption effect of the device.

[0044] (3) Multimodal vibration control is achieved.

[0045] This invention successfully achieves effective multimodal vibration control by designing multiple cantilever beam-type tuned mass damping structures, tuned to different target modal frequencies. This design enables the device to simultaneously damp vibrations in multiple vibration modes, meeting the vibration control requirements of complex engineering structures across multiple frequency ranges, thereby providing a more comprehensive vibration control effect.

[0046] (4) The robustness and adaptability of the device are improved.

[0047] Through its improved dual amplification effect and multimodal tuning design, the present invention maintains high robustness and adaptability in vibration control. Whether under extreme conditions like earthquakes or vibrations with a wide frequency bandwidth, the device operates efficiently, avoiding the detuning issues associated with traditional tuned mass dampers. This significantly enhances the system's stability and reliability in diverse environments.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A broadband tuned inertia damper for multi-modal control, characterized in that: It includes a first cavity, a second cavity, a rotating shaft and multiple groups of cantilever beam type tuned mass damping structures; The cantilever beam type tuned mass damping structure includes a cantilever beam and a tuned second-order mass block, one end of the cantilever beam is fixedly connected to the rotating shaft, and the other end is fixedly connected to the tuned second-order mass block; One end of the rotating shaft is rotatably connected to the first cavity, and the other end is rotatably connected to the second cavity, and can undergo axial relative displacement with the second cavity; A plurality of groups of cantilever beam type tuned mass damping structures are fixedly arranged where the rotating shaft is located in the first cavity, and the tuned second-order mass of each group of cantilever beam type tuned mass damping structures is different.

2. The broadband tuned inertia damper for multi-modal control according to claim 1, characterized in that: In each group of cantilever beam type tuned mass damping structures, the length of the cantilever beams is the same, and the number of tuned second-order mass blocks is different.

3. The broadband tuned inertia damper for multi-modal control according to claim 1, characterized in that: In each group of cantilever beam type tuned mass damping structures, the lengths of the cantilever beams are the same, and the masses of the tuned second-order mass blocks are different.

4. The broadband tuned inertia damper for multi-modal control according to claim 1, characterized in that: Each group of cantilever beam type tuned mass damping structures includes multiple cantilever beam type tuned mass damping structures with the same tuned second-order mass, and the multiple cantilever beam type tuned mass damping structures are evenly distributed along the circumference of the rotating shaft.

5. The broadband tuned inertia damper for multi-modal control according to claim 1, characterized in that: The rotating shaft is connected to the first cavity via a ball bearing.

6. The broadband tuned inertia damper for multi-modal control according to claim 1, characterized in that: The rotating shaft and the second cavity are matched in the form of a ball screw.

7. The broadband tuned inertia damper for multi-modal control according to claim 6, characterized in that: An external thread is provided at the position where the rotating shaft and the second cavity cooperate. A ball screw nut is fixedly provided inside the second cavity, and the ball screw nut cooperates with the external thread.

8. The broadband tuned inertia damper for multi-modal control according to claim 1, characterized in that: A left end is fixedly provided on the first cavity; and / or a right end is fixedly provided on the second cavity.

9. The broadband tuned inertia damper for multi-modal control according to claim 1, characterized in that: The first cavity and / or the second cavity contains viscous liquid.

10. The method for operating a broadband tuned inertia damper for multi-modal control according to any one of claims 1 to 9, characterized in that: include: When an external force causes the first cavity and the second cavity to move relative to each other along the axial direction of the rotating shaft, the second cavity drives the rotating shaft to rotate, and then drives the cantilever beam type tuned mass damping structure on the rotating shaft to rotate, so that the cantilever beam type tuned mass damping structure resonates at the corresponding target frequency and absorbs the vibration energy at the target frequency.

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