Plate bridge type semi-active intelligent vibration absorber

Abstract

The application discloses a kind of plate bridge type semi-active intelligent vibration absorber, belong to vibration control technical field, including support frame component, double-output shaft closed-loop drive component, movable hinged support component, plate bridge type mass component and power supply control module;The double-output shaft closed-loop drive component adopts double-output shaft closed-loop screw motor, is fixed in the middle part of support frame component;Movable hinged support component is constituted by connecting rod, connecting frame and roller clamp, is drivenly connected with the screw rod of double-output shaft closed-loop screw motor;Plate bridge type elastic component adopts leaf spring as simply supported beam structure, one end is fixed in support frame component, two ends form movable hinged support point by roller clamp, plate bridge type elastic component changes stiffness by changing hinged support point distance;Multiple groups of mass of mass component are rigidly connected with mass platform, and mass platform is connected with plate bridge type elastic component by mass block.The application has the advantages of wide frequency adaptation, fast response speed, stable vibration absorption effect and high control precision.

Description

Technical Field

[0001] This invention relates to the field of vibration control technology, specifically to a plate bridge type semi-active intelligent vibration absorber. Background Technology

[0002] Vibration is one of the core issues affecting the operational accuracy of industrial equipment, the safety of building structures, and the comfort of vehicles. Vibration absorbers, as passive vibration control devices, effectively absorb the vibration energy of the controlled main structure and suppress resonance response by tuning their own natural frequency to the natural frequency of the controlled main structure. However, traditional passive vibration absorbers have fixed stiffness and mass, and their natural frequency is not adjustable. They can only effectively suppress vibrations of a single frequency. When the vibration frequency of the main structure shifts, or when there is multi-frequency broadband vibration excitation, their vibration absorption effect will decrease significantly or even fail.

[0003] Semi-actively tuned vibration absorbers, by adjusting their stiffness or mass online, can achieve real-time tuning of their natural frequencies, adapting to a wide range of vibration scenarios and becoming a research hotspot in the field of vibration control. Existing vibration absorbers suffer from inflexible adjustment, making frequency matching difficult, and their installation and operation are cumbersome and slow to deploy. Furthermore, existing vibration absorber structures with multiple dynamic masses, each independently arranged, are prone to asynchronous motion, leading to reduced absorption efficiency and difficulty in achieving a high dynamic-to-static ratio, failing to meet the requirements of miniaturization and high absorption force. Therefore, developing a semi-active intelligent vibration absorber with a simple structure, precise stiffness adjustment, fast response speed, good dynamic mass motion consistency, and strong wide-range adaptability has significant engineering application value. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing passive vibration absorbers, such as poor frequency adaptability, complex structure, low adjustment accuracy, and poor dynamic mass motion consistency. It provides a plate bridge type semi-active intelligent vibration absorber, which achieves continuous and precise adjustment of the absorber stiffness through optimized mechanical structure design, while ensuring synchronous motion of the dynamic mass, thereby improving the dynamic-to-static ratio of the absorber and the suppression effect of wideband vibration of 4~13.3 Hz.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A semi-active intelligent vibration absorber with a plate bridge mainly includes a support frame assembly, a dual-output shaft closed-loop motor drive assembly, a movable hinge assembly, a plate bridge dynamic mass assembly, and a power supply control module; the support frame assembly includes a base, an upper frame, a lower frame, side plates, a bottom plate, and a motor bracket, providing an installation and support foundation for the vibration absorber;

[0007] The dual-output-shaft closed-loop motor drive assembly includes a dual-output-shaft closed-loop lead screw motor, a lead screw, a flange, a linear bearing, and a guide rod. The dual-output-shaft closed-loop lead screw motor is fixed to the middle of the base by a motor bracket, and its two output shafts are coaxially connected to the lead screw. The lead screw is connected to the movable hinge assembly via the flange. The guide rod is arranged parallel to the lead screw and fixed to the side plates at both ends, providing linear guidance for the movable hinge assembly. The movable hinge assembly includes a connecting rod, a connecting frame, and a roller clamp bearing. One end of the connecting rod is hinged to the flange on the lead screw, and the other end is fixedly connected to the connecting frame. The connecting frame slides with the guide rod via the linear bearing. The roller clamp is fixed to the connecting frame and rolls in contact with the plate bridge elastic component to form a movable hinge point. The elastic component uses at least one set of leaf springs as a simply supported beam structure. The two ends of the leaf springs are fixed to the side plates of the support frame assembly via clamps. The body of the leaf spring is in contact with the roller clamps on both sides to form two movable hinge points of the simply supported beam.

[0008] The moving mass assembly includes multiple moving mass blocks and a mass platform. The lower end of each moving mass block is fixedly connected to a leaf spring by a fixing clamp, and the upper end is rigidly connected to the mass platform. The mass platform is arranged parallel to the base.

[0009] The power supply control module includes a battery power supply and a closed-loop control module. The closed-loop control module includes a motor driver, a vibration sensor, and a microcontroller. The vibration sensor collects vibration signals from the controlled main structure, and the microcontroller calculates the hinge point position corresponding to the optimal stiffness in real time, and sends a drive command to the motor driver to drive the dual-output shaft closed-loop lead screw motor, thereby achieving closed-loop precise control of the hinge point displacement.

[0010] Furthermore, the two ends of the dual-output shaft closed-loop screw motor are trapezoidal screws with positive and negative teeth, and the movable hinge support components on both sides are symmetrically arranged about the center of the motor. When the motor rotates, the movable hinge support components on both sides move synchronously in opposite directions or in a straight line along the guide rod to ensure the symmetrical displacement of the two movable hinge support points.

[0011] Furthermore, the roller clamp includes a roller bearing and a wear-resistant roller. The roller is mounted on the roller shaft through the roller bearing. The outer circular surface of the roller is in contact with the upper and lower surfaces of the leaf spring to form a gapless rolling hinge structure. Rolling contact can be achieved when the leaf spring is bent and deformed, avoiding damping loss and structural wear caused by sliding friction.

[0012] Furthermore, the blade springs are provided in two sets, symmetrically arranged on the left and right sides of the dual-output shaft closed-loop screw motor. Each set of blade springs corresponds to a set of movable hinge support components and a dynamic mass block. The dynamic mass blocks corresponding to the two sets of blade springs are rigidly connected to the same mass platform.

[0013] Furthermore, the blade spring is made of aluminum alloy, and the support frame assembly, connecting rod, and connecting frame are all made of lightweight resin material, which reduces the fixed mass of the vibration absorber while ensuring structural strength and improving the dynamic-to-static ratio.

[0014] Furthermore, the guide rod includes parallel long guide rods and vertically arranged short guide rods. The long guide rods penetrate the main structure of the connecting frame, and the short guide rods are arranged on both sides of the base plate to assist in guiding the dynamic mass component, ensuring the straightness and stability of the movable hinge component's movement, and avoiding deflection and jamming.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention adopts the principle of simple beam stiffness adjustment. By driving the movable hinge component synchronously with a dual-output shaft closed-loop screw motor, the effective length between the blade spring hinge support points is changed, thereby realizing continuous, wide-range, and high-precision adjustment of the vibration absorber stiffness. This allows the vibration absorber to adapt to wide frequency vibration scenarios and solves the problem of single frequency in traditional passive vibration absorbers.

[0017] This invention adopts a symmetrical drive structure with dual-output positive and negative threaded screws, which can realize synchronous opposing movement of the hinge points on both sides, ensuring that the midpoint position of the simply supported beam remains unchanged. During the stiffness adjustment process, the static balance position of the vibration absorber remains stable, eliminating the need for additional balance compensation, simplifying the control logic and improving the adjustment efficiency.

[0018] This invention unifies multiple sets of dynamic mass blocks and rigidly connects them to a mass platform to form a plate-bridge structure. On the one hand, this significantly increases the effective dynamic mass of the vibration absorber, achieving a high dynamic-to-static ratio design. It can obtain greater vibration absorption force within the same installation space, and the power drive module can be placed on the mass platform to enable rapid installation of the vibration absorber. On the other hand, it ensures that the movement of multiple sets of dynamic mass blocks is completely synchronized, avoiding the decrease in vibration absorption efficiency caused by asynchronous movement of multiple units, and improving the stability of the vibration absorption effect.

[0019] This invention integrates a power supply control module and a dual-output shaft closed-loop motor drive assembly, enabling precise closed-loop control of the hinge point displacement. Combined with real-time acquisition of vibration signals, it can achieve real-time semi-active tuning of the vibration absorber's natural frequency, resulting in fast response speed, high control accuracy, and adaptability to time-varying vibration excitation scenarios, thus possessing wide engineering applicability. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the plate bridge type semi-active intelligent vibration absorber described in this invention.

[0022] Figure 2 This is a schematic diagram of the assembly of the dual-output shaft closed-loop motor drive assembly and the movable hinge assembly described in this invention.

[0023] Figure 3 This is a schematic diagram showing the connection between the elastic component and the dynamic mass component described in this invention;

[0024] Figure 4 This is an enlarged schematic diagram of the roller clamp described in this invention;

[0025] Figure 5 This is a schematic diagram of the roller bearing described in this invention.

[0026] Explanation of markings in the diagram:

[0027] 1-Battery pack, 2-Mass platform, 3-Upper frame, 4-Dual output shaft closed-loop lead screw motor, 5-Side plate, 6-Lower frame, 7-Motor bracket, 8-Flange, 9-Base, 10-Moving mass block, 11-Leaf spring, 12-Lead screw flange, 13-Connecting rod, 14-Lead screw, 15-Long guide rod, 16-Connecting frame, 17-Linear bearing, 18-Roller clamp, 19-Short guide rod, 20-Fixed clamp, 21-Rolling bearing Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0029] like Figures 1 to 5 As shown, the present invention discloses a plate bridge type semi-active intelligent vibration absorber, which mainly includes a support frame assembly, a dual-output shaft closed-loop motor drive assembly, a movable hinge assembly, an elastic assembly, a plate bridge type dynamic mass assembly, and a control module.

[0030] The support frame assembly is the mounting base of the entire vibration absorber, including a base 9, an upper frame 3, a lower frame 6, a side plate 5, and a motor bracket 7. The lower frame 6 and the upper frame 3 are respectively fixed to the upper and lower sides of the base 9 to form a symmetrical frame structure. The side plate 5 is fixed to the left and right ends of the base 9, and the motor bracket 7 is fixed to the center of the base 9 to install the double-output shaft closed-loop screw motor 4.

[0031] The dual-output-shaft closed-loop motor drive assembly is the power core for adjusting the stiffness of the vibration absorber. It includes a dual-output-shaft closed-loop lead screw motor 4, a lead screw 14, a lead screw flange 12, a linear bearing 17, a flange 8, a long guide rod 15, and a short guide rod 19. The dual-output-shaft closed-loop lead screw motor 4 is fixed to the motor bracket 7 by bolts, and its two output shafts are coaxially connected to the lead screw 14. The two lead screws 14 are trapezoidal lead screws with opposite directions of rotation. The lead screw flange 12 is threaded to the lead screw 14 to convert the rotational motion of the lead screw into linear motion. The long guide rod 15 is arranged parallel to the lead screw 14, and both ends are fixed to the side plates 5 on the left and right sides. The short guide rod 19 is vertically fixed to the base plate through the flange 8, forming a guiding structure for the dynamic mass assembly.

[0032] The movable hinge assembly forms a movable hinge point for the leaf spring, enabling adjustment of the effective length of the simply supported beam. It includes a connecting rod 13, a connecting frame 16, and a roller clamp 18. One end of the connecting rod 13 is hinged to the flange 8 via a hinge seat, and the other end is bolted to the connecting frame 16. The connecting frame 16 has bearing mounting holes, and a linear bearing 17 is interference-fitted into these holes. The roller clamp 18 is mounted on the inner end of the connecting frame 16 via a rolling bearing 21. The outer surface of the roller is in close contact with the upper and lower surfaces of the leaf spring 11, forming a gapless rolling hinge point. The movable hinge assemblies on the left and right sides are arranged symmetrically about the center of the dual-output shaft closed-loop lead screw motor 4. When the motor drives the lead screw 14 to rotate, the flanges 8 on both sides drive the movable hinge assemblies to move synchronously in opposite directions, achieving synchronous adjustment of the distance between the two hinge points.

[0033] The elastic component is the elastic unit of the vibration absorber, which adopts two sets of symmetrically arranged leaf springs 11 as a simply supported beam structure; the left and right ends of the leaf springs 11 are fixed to the short guide rods 19 by fixing clamps 20; when the roller hinge fulcrums on both sides move synchronously to both ends, the effective working section length increases and the stiffness of the elastic unit decreases, thereby realizing continuous adjustment of stiffness.

[0034] The plate-bridge type dynamic mass assembly is the inertial unit of the vibration absorber, including four sets of dynamic mass blocks 10 and a mass platform 2. Each set of leaf springs 11 has a set of dynamic mass blocks 10 fixed to its upper and lower sides at the center. The lower end of each dynamic mass block 10 is rigidly connected to the leaf spring 11 via bolts using fixing clamps 20, and the upper end is uniformly connected to the mass platform 2 via bolts. The mass platform 2 is a rectangular flat plate structure, arranged parallel to the base 9, connecting the four sets of dynamic mass blocks 10 into a single inertial unit. This structure, on the one hand, significantly increases the effective dynamic mass of the vibration absorber through the integration of multiple sets of dynamic mass blocks, providing an installation position for the power supply control module and achieving a higher dynamic-to-static ratio within the same installation volume; on the other hand, the rigid connection of the mass platform ensures that the displacement, velocity, and acceleration of all dynamic mass blocks are completely consistent during vibration, avoiding the decrease in vibration absorption efficiency caused by asynchronous movement of multiple units, and preventing the swaying of the dynamic mass blocks, thus improving the working stability of the vibration absorber.

[0035] The power supply control module includes a 24V battery pack 1 and a closed-loop control module. The 24V battery pack 1 is fixed on the mass platform 2 and supplies power to the dual-output shaft closed-loop ball screw motor 4 and the closed-loop control module. The closed-loop control module includes a microcontroller motor driver.

[0036] When the controlled main structure vibrates, the vibration signal is acquired in real time and transmitted to the closed-loop control unit. The control unit calculates the optimal tuning stiffness of the vibration absorber based on the vibration frequency, and then determines the target effective length between the two hinge points of the leaf spring. Subsequently, the control unit sends a drive command to the dual-output shaft closed-loop lead screw motor. The motor drives the positive and negative threaded screws at both ends to rotate, causing the movable hinge components on both sides to move synchronously in opposite directions along the guide rod, moving the roller clamp to the target position, changing the length of the effective working section of the leaf spring, and completing the precise adjustment of the stiffness so that the natural frequency of the vibration absorber is consistent with the vibration frequency of the main structure. At this time, the dynamic mass component of the vibration absorber generates an inertial force opposite to the vibration direction of the main structure, absorbing the vibration energy of the main structure and achieving resonance suppression. When the vibration frequency of the main structure changes, the control unit can drive the motor in real time to adjust the hinge point position, complete the retuning of the natural frequency, and achieve semi-active vibration control in a wide frequency range of 4~13.3 Hz.

[0037] The above description is only one embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment, but it can be considered that various ways of disclosing the principle herein are still within the scope of the claims.

Claims

1. A plate-bridge type semi-active intelligent vibration absorber, characterized by, This includes a support frame assembly, a dual-output shaft closed-loop motor drive assembly, a movable hinged support assembly, a plate bridge-type dynamic mass assembly, and a power supply control module. The support frame assembly provides a mounting support base for the vibration absorber, and the dual-output shaft closed-loop motor drive assembly is fixed in the middle of the support frame assembly; The dual-output-shaft closed-loop motor drive assembly includes a dual-output-shaft closed-loop lead screw motor (4), a lead screw (14), a lead screw flange (12), a flange (8), a linear bearing (17), and a guide rod. The two output shafts of the dual-output-shaft closed-loop lead screw motor (4) are coaxially connected to the lead screw (14). The lead screw (14) is connected to the movable hinge assembly through the lead screw flange (12). The guide rod includes a long guide rod (15) and a short guide rod (19), both of which are arranged parallel to the lead screw (14). The two ends of the long guide rod (15) are fixed to the support frame assembly, and the short guide rod (19) is vertically fixed to the base plate through the flange (8), forming a dynamic mass assembly guide structure. The movable hinge assembly includes a connecting rod (13), a connecting frame (16), and a roller clamp (18). One end of the connecting rod (13) is hinged to the flange (8) through a hinge seat, and the other end is fixedly connected to the connecting frame (16). The connecting frame (16) has a bearing mounting hole, and a linear bearing (17) is interference-fitted into the bearing mounting hole. The long guide rod (15) and the short guide rod (19) pass through the corresponding linear bearing (17) respectively, so that the connecting frame (16) can slide smoothly in a straight line along the guide rod. The roller clamp (18) is installed on the upper end of the connecting frame (16) through a rolling bearing (21). The elastic component is the elastic unit of the vibration absorber. It uses at least one set of leaf springs (11) as a simply supported beam structure. The two ends of the leaf springs (11) are fixed on the short guide rod (19). The rod body of the leaf springs (11) is closely fitted with the outer circular surface of the roller of the roller clamp (18) to form two movable hinge points of the simply supported beam. The plate bridge type dynamic mass assembly includes at least one set of dynamic mass blocks (10) and mass platform (2). The dynamic mass blocks (10) and leaf springs (11) are rigidly connected by bolts through fixing clamps (20). The upper ends of all dynamic mass blocks (10) are rigidly connected to the mass platform (2). The mass platform (2) is a rectangular flat plate structure and is arranged parallel to the base (9) of the support frame assembly. The power supply control module includes a 24V battery pack (1) and a closed-loop control module. The 24V battery pack (1) is fixed on the mass platform (2) to supply power to the dual-output shaft closed-loop ball screw motor (4) and the closed-loop control module. The closed-loop control module includes a motor driver, a vibration sensor, and a microcontroller, which are electrically connected to the dual-output shaft closed-loop ball screw motor (4) and realize closed-loop control.

2. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, The screws (14) at both ends of the dual-output shaft closed-loop screw motor (4) are trapezoidal screws with opposite directions of rotation. The movable hinge components on both sides are arranged symmetrically about the center of the dual-output shaft closed-loop screw motor (4). When the motor rotates, the flanges (8) on both sides drive the movable hinge components to make synchronous opposite or reverse linear movements along the guide rod.

3. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, The rollers of the roller clamp (18) are mounted on the roller shaft via rolling bearings (21). The outer circular surface of the rollers is in close contact with the upper and lower surfaces of the leaf spring (11) to form a gapless rolling hinge structure.

4. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, Two sets of blade springs (11) are provided and symmetrically arranged on the upper and lower sides of the double-output shaft closed-loop screw motor (4). Each set of blade springs (11) corresponds to a set of movable hinge support components and multiple sets of dynamic mass blocks (10). All dynamic mass blocks (10) are rigidly connected to the same mass platform (2).

5. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, The closed-loop control module is connected to the encoder signal of the dual-output-shaft closed-loop lead screw motor (4) to realize closed-loop control of hinge point displacement and real-time semi-active tuning of the vibration absorber's natural frequency.

6. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, The leaf spring (11) is made of spring steel, and the support frame assembly, connecting rod (13), and connecting frame (16) are all made of lightweight resin.

7. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, The long guide rod (15) passes through the main structure of the connecting frame (16), and the short guide rod (19) is vertically fixed to the base plate through the flange (8) to form a dynamic mass component guide structure.

8. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, The support frame assembly includes a base (9), an upper frame (3), a lower frame (6), a side plate (5), and a motor bracket (7). The dual-output closed-loop lead screw motor (4) is fixed to the middle of the base (9) through the motor bracket (7). The side plate (5) is fixed to both ends of the base (9). The two ends of the long guide rod (15) are fixed to the side plate (5). The two ends of the leaf spring (11) are fixed to the short guide rod (19) through the fixing clamp (20).

9. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, The mass platform (2) rigidly connects all the moving mass blocks (10) into an integral inertial unit, providing an installation position for the power supply control module, ensuring that all the moving mass blocks (10) move synchronously, and improving the working stability and dynamic-to-static ratio of the vibration absorber.

10. The plate bridge type semi-active intelligent vibration absorber according to claim 1, characterized in that, By driving the movable hinge assembly synchronously displacement through the double-output shaft closed-loop screw motor (4), the effective length between the two movable hinge points of the blade spring (11) is changed, thereby realizing the continuous adjustment of the vibration absorber stiffness and thus changing the natural frequency of the vibration absorber.

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