A multi-modal control-oriented wide-frequency tuning electrostatically actuated inerter damper and working method

Abstract

The application provides a wide-frequency tuning and inerter damper for multi-modal control and a working method, relates to the technical field of vibration control, and comprises a first cavity, a second cavity, a rotating shaft and multiple groups of cantilever beam type tuning mass damper structures; the cantilever beam type tuning mass damper structure comprises a cantilever beam and a tuning second-order mass block, one end of the cantilever beam is fixedly connected with the rotating shaft, and the other end is fixedly connected with the tuning second-order mass block; one end of the rotating shaft is rotationally connected with the first cavity, the other end is rotationally connected with the second cavity, and axial relative displacement can occur between the rotating shaft and the second cavity; the multiple groups of cantilever beam type tuning mass damper structures are fixedly arranged at the rotating shaft located in the first cavity, and the tuning second-order masses of each group of cantilever beam type tuning mass damper structures are different. The application can realize simultaneous control of multiple vibration modes and improve the vibration control effect.

Description

Technical Field

[0001] This invention relates to the field of vibration control technology, specifically to a wideband tuned inertial capacitive damper for multimodal control and its operating method. Background Technology

[0002] When a structure is subjected to environmental loads, it often vibrates. If the vibration response is too large, it may lead to component fatigue or even structural failure. Therefore, in order to improve the service performance of the structure and ensure its safety and reliability, it is particularly important to install vibration damping devices to absorb or dissipate vibration energy and reduce the structural vibration response. Tuned mass dampers, as a commonly used passive control vibration damping structure, absorb external vibration energy through the resonance of the tuned mass and convert it into heat energy or other forms of energy for dissipation, 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 to target a single modal frequency of the engineering structure. This means that the damper can only effectively control vibrations at a specific modal frequency, and cannot provide effective control for engineering structures with multiple modes, thus failing to control complex vibration structures. Furthermore, traditional tuned mass dampers usually require a large mass and stroke to achieve efficient vibration energy absorption. This makes them unsuitable for some engineering structures, especially bridges and other structures requiring compact space, and unable to meet practical engineering needs. Summary of the Invention

[0004] To address at least one deficiency of the prior art, the present invention aims to provide a wideband tuned inertial capacitive damper and its operating method for multimodal control. The damper has a compact structure and can function 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 wideband tuned inertial-capacitive damper for multimodal control, comprising a first cavity, a second cavity, a rotating shaft, and multiple sets 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 rotation axis, 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 it is capable of axial relative displacement with the second cavity;

[0008] Multiple sets of cantilever beam-type tuned mass damping structures are fixedly installed at the location of the rotation axis within the first cavity, and the tuned second-order mass of each set of cantilever beam-type tuned mass damping structures is different.

[0009] A second aspect of the present invention provides a method for operating a broadband tuned inertial capacitive damper for multimodal control based on the first aspect, comprising: when an external force causes a first cavity and a second cavity to move relative to each other along the axial direction of a rotation axis, the second cavity drives the rotation axis to rotate, thereby driving the cantilever beam type tuned mass damping structure on the rotation axis 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 beneficial effects of the present invention are:

[0011] This invention provides a broadband tuned inertial capacitive damper and its operating method for multimodal control. By introducing a cantilever beam-type tuned mass damping structure inside the inertial container, the requirement for large mass and long stroke in traditional tuned mass dampers is 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 more confined and complex engineering structures, such as bridges and other space-constrained engineering applications. Furthermore, by designing multiple sets of cantilever beam-type tuned mass damping structures with different second-order tuned masses, each corresponding to a different target modal frequency, effective control of multimodal vibration is achieved. This allows the damper to simultaneously reduce vibration in multiple vibration modes, meeting the vibration control requirements of complex engineering structures across multiple frequency ranges, thus providing a more comprehensive vibration control effect.

[0012] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of a wideband tuned inertial capacitive damper for multimodal control provided in an embodiment of the present invention;

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

[0016] In the attached figures, the reference numerals 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 Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] The terms "first," "second," etc., used in this specification are used to distinguish different objects, not to describe a specific order. Terms indicating location, such as "upper" and "lower," are used to describe the relative positional relationship of the structural parts in their normal operating state and do not necessarily limit the location. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. 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 may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0019] In the description of this invention, "a plurality of" means two or more. Unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] This invention provides a wideband tuned inertial capacitive damper and its operating method for multimodal control, mainly used for vibration control of engineering structures, such as... Figures 1-2 As shown, the wideband tuned inertial-capacitive damper for multimodal control includes a first cavity 21, a second cavity 24, a rotating shaft 14, and multiple sets 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 rotation axis 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 is capable of axial relative displacement with the second cavity 24;

[0023] Multiple sets of cantilever beam type tuned mass damping structures are fixedly installed at the location of the rotation axis 14 inside the first cavity 21, and the tuned second-order mass of each set of cantilever beam type tuned mass damping structures is different.

[0024] To address the limitations of traditional tuned mass dampers in terms of structure and operating characteristics, this invention provides a novel broadband tuned inertial capacitive damper and its operating method. The main improvements are as follows: First, this invention introduces a cantilever beam-type tuned mass damping structure inside the inertial container. This design, by combining the cantilever beam-type tuned mass damping structure with the resonant tuning of the inertial container, achieves effective absorption of vibration energy. Compared to traditional tuned mass dampers, this device has a smaller mass and a more compact structure, thus greatly improving its compactness and integration. Second, this invention achieves multi-mode tuning and vibration reduction through a multi-frequency resonance design. Multiple sets of cantilever beam-type tuned mass damping structures are set inside the damper, and each set has a different second-order tuning mass, thereby enabling effective tuning and vibration reduction of multiple modal frequencies simultaneously. The first cavity houses multiple sets of cantilever beam-type tuned mass damping structures on its internal rotating shaft. Each set has the same cantilever beam dimensions but different tuned second-order masses. By adjusting the tuned second-order masses of each set, the resonant frequencies of each cantilever beam-type tuned mass damping structure differ. This design allows the device to function simultaneously across multiple vibration modes, providing efficient vibration reduction across multiple frequency ranges, thus offering more comprehensive and efficient vibration control for complex engineering structures. Furthermore, this invention significantly enhances the energy dissipation capacity of the tuned mass damper based on the dual amplification effect of the inertial container. By combining the inertial container and the tuned mass damper, this invention fully utilizes the amplification effect of the inertial container, effectively improving the performance of traditional tuned mass dampers. The linear motion is converted into high-speed rotational motion via a ball screw assembly, further amplifying the vibration of the cantilever beam tuned mass damping structure, thereby generating greater inertial force. In addition, the ball screw assembly enables second-order mass amplification of the cantilever beam tuned mass damping structure, resulting in a negative stiffness effect. The negative stiffness effect can promote the movement of the damper, further enhancing its energy dissipation capacity, thereby significantly improving the vibration control effect.

[0025] The damper has terminals at both ends that connect to external structures. For ease of description, let's call them... Figure 1 Taking the direction shown as an example, Figure 1The end on the left is called the left end 25, and the end on the right is called the right end 26. It should be understood that the "left" and "right" orientations do not represent any limitation on the structure itself. The left end 25 is fixedly connected to the end of the first cavity 21 away from the end connected to the rotation axis 14. The right end 26 is fixedly connected to the end of the second cavity 24 away from the end connected to the rotation axis 14.

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

[0027] Multiple sets of cantilever beam-type tuned mass damping structures are fixedly installed on the outer wall of the portion of the rotating shaft 14 located inside the first cavity 21. Each set of cantilever beam-type tuned mass damping structures has the same structure, but the tuned second-order mass is different. The cantilever beam-type tuned mass damping structure includes a cantilever beam 12 and a tuned second-order mass block 11. The tuned second-order mass block 11 is fixed to one end of the cantilever beam 12 by bolts 13, thus forming a cantilever beam structure. The tuned second-order mass block 11 is rigidly connected to the rotating shaft 14 through the cantilever beam 12, ensuring that it can rotate synchronously with the rotating shaft, thereby achieving tuned resonance under the action of external force.

[0028] The device of this invention can suppress and effectively control multimodal vibrations, thus requiring the adjustment of multiple cantilever beam-type tuned mass dampers to different target modal frequencies. The tuning second-order mass between each group of cantilever beam-type tuned mass damping structures can be changed by altering the mass of the tuning second-order mass block 11 or by changing the number of tuning second-order mass blocks 11. In this embodiment, the mass of each tuning second-order mass block 11 is the same, but the number of tuning second-order mass blocks between different groups of cantilever beam-type tuned mass damping structures is different. In this case, 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 tuning second-order mass blocks in the cantilever beam-type tuned mass damping structure. For example, in Figure 1 In the structure shown, the number of second-order tuning mass blocks in the three sets of cantilever beam-type tuned mass damping structures, from left to right, are one, two, and three, respectively, thereby achieving resonance at different target modal frequencies.

[0029] Furthermore, each group of cantilever beam-type tuned mass damping structures can also correspond to multiple cantilever beam-type tuned mass damping structures with identical second-order tuned masses, and these multiple cantilever beam-type tuned mass damping structures are uniformly distributed circumferentially along the rotation axis. For example, such as Figure 2As shown, in this embodiment, the cantilever beam type tuned mass damping structure adopts a symmetrical arrangement centered on the rotation axis, with each group specifically including four tuned mass damping structures. Through the above design, multiple groups of cantilever beam type tuned mass damping structures are tuned to different target modal frequencies. Under the action of external force, the rotational motion of the rotation axis drives the movement of the tuned second-order mass blocks through the cantilever beam. Each group of tuned second-order mass blocks will undergo tuned resonance at its respective target modal frequency, thereby effectively absorbing and dissipating the vibrational energy of the target modal frequency.

[0030] The rotating shaft 14 and the first cavity 21 can only rotate relative to each other, but cannot be displaced relative to each other; while the rotating shaft 14 and the second cavity 24 can both rotate relative to each other and be displaced relative to each other. Thus, when external vibration occurs, the relative displacement between the left end 25 and the right end 26 can be converted into the 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 extending beyond the first cavity 21 has a screw-like outer surface with an external thread 22 extending to the end of the rotating shaft 14 furthest from the first cavity 21. The rotating shaft 14 and the second cavity 24 are fitted together using a ball screw mechanism. A ball screw nut 23 is rigidly connected inside the second cavity, and the ball screw nut 23 is fitted onto the external thread 22 of the rotating shaft 14 to achieve a threaded fit. Thus, when an external force is applied to the second cavity, the linear motion of the second cavity along the axial direction of the rotating shaft can be converted into the rotational motion of the rotating shaft.

[0032] In some embodiments, the energy dissipation characteristics can be further improved by adding a viscous fluid. For example, adding a viscous fluid (preferably in the first cavity) to the first cavity and / or the second cavity, and utilizing the interaction between the cantilever beam type tuned mass damper and the rotating shaft during motion, further enhances the energy dissipation capability of the system. The addition of viscous fluid can effectively improve the energy dissipation efficiency of the damping device.

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

[0034] This invention provides a broadband tuned inertial capacitive damper for multimodal control. The core of this invention lies in the dual amplification effect provided by the inertial container, specifically including two aspects: a motion amplification effect that converts linear motion into rotational motion, and a mass amplification effect. When the left and right ends move relative to each other under 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 cantilever beam-type tuned mass damping structure rigidly connected to the rotating shaft to rotate. In other words, under external force, the rotational motion of the cantilever beam-type tuned mass damping structure is amplified. Furthermore, due to the high-speed rotation of the rotating shaft and the cantilever beam-type tuned mass damping structure, they generate rotational moments of inertia, forming an amplification effect of the tuned second-order mass, i.e., apparent mass, thus producing a negative stiffness effect. This negative stiffness effect promotes the rotational motion of the cantilever beam-type tuned mass damping structure, further enhancing its energy absorption and dissipation capabilities, and significantly improving the vibration control effect.

[0035] This invention further provides a method for operating the wideband tuned inertial capacitive damper for multimodal control, including:

[0036] When an external force causes the first cavity and the second cavity to move relative to each other along the axis of rotation, the second cavity drives the axis of rotation to rotate, which in turn drives the cantilever beam type tuned mass damping structure on the axis of rotation to rotate, causing the cantilever beam type tuned mass damping structure to resonate at the corresponding target frequency, thereby absorbing the vibration energy at the target frequency.

[0037] Specifically, when an external force causes the left and right ends to move away from or towards each other, relative motion occurs between the first and second cavities. The second cavity drives the rotating shaft via a ball screw nut, converting linear motion into rotational motion, causing the rotating shaft to rotate at high speed. Simultaneously, the cantilever beam is rigidly connected to the rotating shaft, driving the tuned second-order mass block to rotate. Due to the stiffness of the cantilever beam, the tuned second-order mass block vibrates relative to the rotating shaft during rotation, amplifying its rotational motion. The tuned second-order mass block, cantilever beam, and rotating shaft, driven by the rotation of the ball screw, generate a large rotational moment of inertia during rotation, creating a mass amplification effect and thus a negative stiffness effect. This negative stiffness effect further promotes rotational motion, significantly enhancing the system's energy absorption and dissipation capabilities, thereby significantly improving vibration control performance.

[0038] This invention introduces a cantilever beam-type tuned mass damping structure into the inertial container, enabling effective tuning and vibration reduction of multiple modal frequencies simultaneously. Multiple sets of cantilever beam-type tuned mass damping structures can be installed on the rotation axis of the inertial container. Each set of cantilever beams has the same dimensions. By adjusting the tuning second-order mass of each set, the resonant frequency of each set of tuned mass damping structures is changed. Each set of tuned mass damping structures can be independently tuned to a single modal frequency. Under the action of external force, linear motion is transformed into rotational motion of the cantilever beam tuned mass damping structure, resonating with the target frequency, thereby achieving the absorption and dissipation of vibration energy at the target modal frequency. By combining multiple sets 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 engineering structures at multiple modal frequencies.

[0039] Compared with existing technologies, the broadband tuned inertial capacitive damper for multimodal control provided by this invention has the following technological advantages:

[0040] (1) Improved the compactness and integration of the device.

[0041] By introducing a cantilever beam-type tuned mass damping structure inside the inertial container, the requirements for large mass and long stroke of traditional tuned mass dampers are effectively reduced, making the vibration control device more compact and easier to integrate. This design not only improves the space utilization efficiency of the device, but also enables it to adapt to more confined and complex engineering structures, such as bridges and other space-constrained engineering applications.

[0042] (2) It significantly enhances the ability to absorb and dissipate vibration energy.

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

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

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

[0046] (4) Improved the robustness and adaptability of the device.

[0047] Through improved dual amplification effect and multimodal tuning design, this invention maintains high robustness and adaptability in vibration control. Whether under extreme conditions such as earthquakes or in vibrations with a wide frequency bandwidth, this device operates efficiently, avoiding the detuning problem of traditional tuned mass dampers, thereby significantly enhancing the stability and reliability of the system in different environments.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wideband tuned inertial capacitive damper for multimodal control, characterized in that, It includes a first cavity, a second cavity, a rotating shaft, and multiple sets 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 rotation axis, 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 it is capable of axial relative displacement with the second cavity; Multiple sets of cantilever beam type tuned mass damping structures are fixedly installed at the location of the rotation axis within the first cavity, and the tuned second-order mass of each set of cantilever beam type tuned mass damping structures is different. The number of tuned second-order mass blocks differs among different groups of cantilever beam-type tuned mass damping structures. Each group of cantilever beam type tuned mass damping structures includes multiple cantilever beam type tuned mass damping structures with the same second-order tuned mass, and the multiple cantilever beam type tuned mass damping structures are evenly distributed along the circumference of the rotation axis. The rotating shaft and the first cavity can only rotate relative to each other, but cannot be displaced relative to each other; while the rotating shaft and the second cavity can both rotate relative to each other and be displaced relative to each other.

2. A wideband tuned inertial capacitive damper for multimodal control as described in claim 1, characterized in that, The rotating shaft is connected to the first cavity via a ball bearing.

3. A wideband tuned inertial capacitive damper for multimodal control as described in claim 1, characterized in that, The rotating shaft is fitted to the second cavity using a ball screw mechanism.

4. A wideband tuned inertial capacitive damper for multimodal control as described in claim 3, characterized in that, The rotating shaft is provided with an external thread at the point where it mates with the second cavity. A ball screw nut is fixedly installed inside the second cavity, and the ball screw nut mates with the external thread.

5. A wideband tuned inertial capacitive damper for multimodal control as described in claim 1, characterized in that, A left end is fixedly disposed on the first cavity; and / or a right end is fixedly disposed on the second cavity.

6. A wideband tuned inertial capacitive damper for multimodal control as described in claim 1, characterized in that, The first cavity and / or the second cavity contain a viscous liquid.

7. The operating method of a wideband tuned inertial capacitive damper for multimodal control as described in any one of claims 1-6, characterized in that, include: When an external force causes the first cavity and the second cavity to move relative to each other along the axis of rotation, the second cavity drives the axis of rotation to rotate, which in turn drives the cantilever beam type tuned mass damping structure on the axis of rotation to rotate, causing the cantilever beam type tuned mass damping structure to resonate at the corresponding target frequency and absorb the vibration energy at the target frequency.

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