Intelligent semi-active dynamic vibration absorber

Abstract

The invention discloses an intelligent semi-active dynamic vibration absorber which comprises an elastic element, a mass block and a rotating translation mechanism, the elastic element is fixedly connected to the top in a shell, the mass block is installed in the shell, the rotating translation mechanism comprises a servo motor, a rotating disc, a connecting rod, a pulley and a sliding block, and the servo motor is connected with the rotating disc. The rotating disc is connected with a sliding block and a connecting pulley through a connecting rod, the connecting pulley is connected with a sliding groove in an elastic rod in a matched mode, the sliding block is connected with a linear sliding rail fixed to a mass block in a matched mode, and a servo motor, a circuit board and a rechargeable battery are installed in the mass block. When the servo motor rotates, the rotating disc drives the connecting rod to move, the connecting rod drives the sliding block and the connecting pulley to move along the sliding groove in the middle of the cross-shaped elastic rod and the linear sliding rail, the distance from the fixed end of the elastic rod to the mass block cantilever beam is changed, and therefore the resonant frequency of the system is changed. The device is compact in structure and small in size, is provided with a power supply and a control circuit board, and facilitates the installation and arrangement of equipment.

Description

Technical Field

[0001] This invention belongs to the field of dynamic vibration absorber technology, specifically an intelligent semi-active dynamic vibration absorber. Background Technology

[0002] A dynamic vibration absorber is a device that uses an additional vibration system to suppress the vibration of a main system. Its core principle is the cancellation of resonant anti-phase energy. A dynamic vibration absorber typically consists of a single-degree-of-freedom vibration system composed of a mass, spring, and damping elements. During operation, the dynamic vibration absorber alters the vibration state of the main system by adjusting its structural form, dynamic parameters, and coupling relationship with the main system. This aims to reduce the forced vibration response of the main system within the desired frequency band. Through the dynamic action of the auxiliary mass, the force generated by the absorber's elastic elements on the main system can counteract some or most of the external excitation force acting on the main system, thus weakening the main system's vibration. Essentially, the vibration energy of the main system is transferred to the dynamic vibration absorber.

[0003] Dynamic vibration absorbers are classified into passive, semi-active, and active types based on whether they require external energy. Passive dynamic vibration absorbers have a simple structure and good vibration reduction effect, but their operating frequency band is very narrow. Active dynamic vibration absorbers, although having a wide operating frequency band, have a complex structure and require high control precision, making them unsuitable for widespread application. Semi-active dynamic vibration absorbers combine the advantages of both: simple structure, easy implementation, good vibration reduction effect, and effective vibration reduction of the main system within a certain frequency range. Therefore, they are widely used in engineering practice. Currently, semi-active dynamic vibration absorbers are available in two forms: adjustable damping and adjustable frequency. The following are the advantages and disadvantages of each type.

[0004] (1) The damping adjustable semi-active dynamic vibration absorber increases the control frequency bandwidth by changing the damping of the structure, but this method can only control vibration at a specific frequency, and increasing the damping will affect the vibration absorption effect.

[0005] (2) The wideband dual-frequency semi-active dynamic vibration absorber involved in patent number ZL202321833386.5 can achieve wideband vibration control of dual frequencies by changing the center of gravity of two mass blocks. However, the patent adopts a cantilever beam structure, the equipment installation volume is large, the vibration absorption effect is poor, and it requires external separate power and control modules. Summary of the Invention

[0006] The present invention proposes an intelligent semi-active dynamic vibration absorber with a built-in rechargeable battery and control circuit board to solve the problems of narrow operating frequency and difficult installation of dynamic vibration absorbers. It also solves the problems of semi-active dynamic vibration absorbers requiring external power supply and separate control system.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: An intelligent semi-active dynamic vibration absorber includes an elastic element, a mass block, a housing, and a rotation and translation mechanism. The elastic element is fixedly connected to the top of the housing, and the mass block is installed inside the housing. The rotation and translation mechanism includes a servo motor, a rotating disk, a connecting rod, a pulley, and a slider. The servo motor is connected to the rotating disk, and the rotating disk is connected to the slider and the connecting pulley via a rotatable connecting rod. The connecting pulley is connected to a groove in the elastic rod of the elastic element, and the slider is connected to a linear slide rail fixed on the mass block. The servo motor, a circuit board, and a rechargeable battery are installed inside the mass block. When the servo motor rotates, it drives the connecting rod to move via the rotating disk. The connecting rod drives the slider and the connecting pulley to move along the groove in the middle of the cross-shaped elastic rod and the linear slide rail, changing the distance from the fixed end of the elastic rod to the cantilever beam of the mass block, thereby changing the resonant frequency of the system.

[0008] Furthermore, the elastic element includes a top cross-shaped elastic rod, and a groove is provided in the middle of the connecting rod of the top cross-shaped elastic rod.

[0009] Furthermore, the top cross-shaped elastic bar is bolted to the top plate of the housing.

[0010] Furthermore, the connecting pulley is connected to the slider via a load-bearing connecting shaft. The connecting pulley can slide freely in the middle groove of the cross elastic rod. The linear slide rail is fixed to the mass block by bolts, and the slider can move linearly on the linear slide rail.

[0011] Furthermore, the servo motor is bolted inside the mass block, which also houses circuit boards and a rechargeable battery, and is sealed by the mass block base.

[0012] Furthermore, it consists of an upper top plate, side plate one, side plate two, and a bottom plate.

[0013] Furthermore, a mass block is connected between the top plate and the bottom plate via a guide shaft, allowing the mass block to move up and down along the guide shaft.

[0014] Furthermore, a linear bearing is installed at each of the four corners of the mass block, and the bottom of the mass block is supported by four bottom support springs.

[0015] Furthermore, when the rotating disk rotates clockwise, it drives the slider, load-bearing connecting shaft, and connecting pulley to move inward toward the cross elastic rod, reducing the length of the cantilever beam and increasing the natural frequency of the dynamic vibration absorber. Conversely, the natural frequency of the dynamic vibration absorber decreases. In conjunction with the built-in PID control system of the dynamic vibration absorber, the control frequency can be tracked when the mechanical characteristic frequency changes.

[0016] Furthermore, this intelligent semi-active dynamic vibration absorber is fixed to the controlled mechanical equipment via a base plate. An acceleration feedback sensor or speed sensor is placed at the fixed position to monitor the characteristic frequency of the controlled mechanical equipment. The acceleration feedback sensor or speed sensor is connected to the PID control system and circuit board. When the mechanical equipment is running, the acceleration feedback sensor or speed sensor will collect the controlled characteristic frequency. When the characteristic frequency changes, the built-in rechargeable battery supplies power to the built-in circuit board and servo motor. The circuit board controls the servo motor to rotate, which drives the connecting rod to move. This causes the slider, load-bearing connecting shaft, and connecting pulley to move along the middle groove of the cross elastic rod, changing the length of the cantilever beam. This makes the natural frequency of the dynamic vibration absorber the same as the vibration frequency of the controlled mechanical equipment, thereby achieving the effect of wide-frequency vibration control.

[0017] Compared with the prior art, the present invention has the following advantages: 1. According to the present invention, the semi-active power vibration absorber has a compact structure, small size, and comes with its own power supply and control circuit board, which facilitates the installation and layout of the equipment.

[0018] 2. According to the present invention, the semi-active dynamic vibration absorber has a wide operating frequency. When the characteristic frequency of the mechanical equipment changes, the natural frequency of the dynamic vibration absorber is made the same as the controlled vibration frequency by changing the length of the cantilever beam, thereby achieving the effect of wide frequency vibration control and realizing vibration frequency tracking control. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the intelligent semi-active dynamic vibration absorber of the present invention; Figure 2 Top view of the intelligent semi-active dynamic vibration absorber (excluding the top and side plates). Figure 3 This is a perspective view of the intelligent semi-active dynamic vibration absorber of the present invention; Figure 4 These are three views of the intelligent semi-active dynamic vibration absorber of the present invention; Wherein: (a) is the front view, (b) is the left view, and (c) is the top view; Figure 5 This is an exploded view of the intelligent semi-active dynamic vibration absorber of the present invention; Figure 6 For the isometric drawing of the rotation and translation mechanism; Figure 7 This is a top view of the rotation and translation mechanism; Figure 8 This is a schematic diagram illustrating the application of the intelligent semi-active dynamic vibration absorber of the present invention; In the diagram: 1. Top elastic rod, 2. Top plate, 3. Load-bearing connecting shaft, 4. Guide shaft, 5. Side plate one, 6. Mass block, 7. Bottom support spring, 8. Base plate, 9. Side plate two, 10. Mass block base, 11. Rechargeable battery, 12. Circuit board, 13. Servo motor, 14. Linear slide rail, 15. Connecting pulley, 16. Slider, 17. Rotary disk, 18. Connecting shaft, 19. Connecting rod, 20. Linear bearing, 21. Rotation and translation mechanism, 22. Acceleration feedback sensor or speed sensor. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 7 As shown in the figure, the novel intelligent semi-active dynamic vibration absorber provided in this embodiment of the invention is mainly composed of an elastic element, a mass block 6, a shell, and a rotation and translation mechanism 21.

[0022] The top cross elastic rod 1 is fixed to the upper top plate 2 by bolts. The middle of the connecting rod of the top cross elastic rod 1 is a sliding groove. The connecting pulley 15 can slide freely in the middle sliding groove of the cross elastic rod 1. The connecting pulley 15 is connected to the slider 16 through the load-bearing connecting shaft 3. The slider 16 can move linearly on the linear slide rail 14. The linear slide rail 14 is fixed to the mass block 6 by bolts. The servo motor 13 is installed inside the mass block 6 by bolts. The circuit board 12 and the rechargeable battery 11 are also installed inside the mass block 6 and sealed by the mass block base 10. The servo motor 13 shaft is connected to the center hole of the rotating disk 17. The servo motor 13 can drive the rotating disk 17 to rotate. The rotating disk 17 is installed on one end of the connecting rod 19 through the connecting shaft 18. The connecting rod 19 can rotate at this end. The other end of the connecting rod 19 is sleeved on the load-bearing connecting shaft 3. The top plate 2, side plate 1 5, side plate 2 9, and bottom plate 8 form the outer shell of the equipment, which plays a supporting and fixing role. The guide shaft 4 is fixed at both ends to the bosses of the top plate 2 and the bottom plate 8. Eight linear bearings 20 are installed at the four corners of the mass block 6. The mass block 6 can move up and down along the guide shaft 4. The bottom of the mass block is supported by four bottom support springs 7.

[0023] When the servo motor 13 rotates, it drives the connecting rod 19 to move via the rotating disk 17. The connecting rod 19 then moves the slider 16, the load-bearing connecting shaft 3, and the connecting pulley 15 along the middle groove of the cross elastic rod 1, changing the distance between the fixed end of the cross elastic rod 1 and the cantilever beam of the mass block 6, thereby changing the resonant frequency of the system. From the top view, the rotating disk 17 rotates clockwise, causing the slider 16, the load-bearing connecting shaft 3, and the connecting pulley 15 to move inward toward the cross elastic rod 1. The length of the cantilever beam decreases, and the natural frequency of the dynamic vibration absorber increases. Conversely, the natural frequency of the dynamic vibration absorber decreases. With the built-in PID control system of the dynamic vibration absorber, the control frequency can be tracked when the mechanical characteristic frequency changes.

[0024] Application Example: Controlling Vibration of Mechanical Equipment like Figure 8 As shown, the novel intelligent semi-active dynamic vibration absorber of the present invention is fixed to the controlled mechanical equipment via the base plate 8. According to the control frequency requirements of the equipment, an acceleration feedback sensor or speed sensor 22 for monitoring the characteristic frequency of the controlled mechanical equipment is arranged at the fixed position of the present invention. The sensor is connected to the present invention. When the mechanical equipment is running, the acceleration feedback sensor or speed sensor 22 will collect the controlled characteristic frequency. When the characteristic frequency changes, the built-in rechargeable battery 11 supplies power to the built-in circuit board 12 and servo motor 13. The circuit board 12 will control the servo motor 13 to rotate, causing the connecting rod 19 to move, so that the slider 16, the load-bearing connecting shaft 3, and the connecting pulley 15 move along the middle groove of the cross elastic rod 1, changing the length of the cantilever beam, so that the natural frequency of the dynamic vibration absorber is the same as the controlled vibration frequency, thereby achieving the effect of wide frequency vibration control.

Claims

1. An intelligent semi-active dynamic vibration absorber, characterized in that: The system comprises an elastic element, a mass block, a housing, and a rotation and translation mechanism. The elastic element is fixedly connected to the top of the housing, and the mass block is installed inside the housing. The rotation and translation mechanism includes a servo motor, a rotating disk, a connecting rod, pulleys, and a slider. The servo motor is connected to the rotating disk, which is connected to the slider and connecting pulleys via a rotatable connecting rod. The connecting pulleys are engaged with a groove in the elastic rod of the elastic element, and the slider is engaged with a linear guide rail fixed on the mass block. The servo motor, circuit board, and rechargeable battery are installed inside the mass block. When the servo motor rotates, it causes the connecting rod to move via the rotating disk. The connecting rod then moves the slider and connecting pulleys along the groove in the middle of the cross-shaped elastic rod and the linear guide rail, changing the distance from the fixed end of the elastic rod to the cantilever beam of the mass block, thereby changing the resonant frequency of the system.

2. The intelligent semi-active dynamic vibration absorber according to claim 1, characterized in that: The elastic element includes a top cross-shaped elastic rod, and a groove is provided in the middle of the connecting rod of the top cross-shaped elastic rod.

3. The intelligent semi-active dynamic vibration absorber according to claim 2, characterized in that: The top cross-shaped elastic bar is bolted to the top plate of the housing.

4. The intelligent semi-active dynamic vibration absorber according to claim 1, characterized in that: The connecting pulley is connected to the slider via a load-bearing connecting shaft. The connecting pulley can slide freely in the middle groove of the cross elastic rod. The linear slide rail is fixed to the mass block by bolts, and the slider can move linearly on the linear slide rail.

5. The intelligent semi-active dynamic vibration absorber according to claim 1, characterized in that: The servo motor is bolted inside the mass block and sealed by the mass block base.

6. The intelligent semi-active dynamic vibration absorber according to claim 1, characterized in that: The outer shell consists of a top plate, side plate one, side plate two, and bottom plate.

7. The intelligent semi-active dynamic vibration absorber according to claim 6, characterized in that: A mass block is connected between the top plate and the bottom plate via a guide shaft, and the mass block can move up and down along the guide shaft.

8. The intelligent semi-active dynamic vibration absorber according to claim 1, characterized in that: The mass block has a linear bearing installed at each of its four corners, and its bottom is supported by four bottom support springs.

9. The intelligent semi-active dynamic vibration absorber according to claim 2, characterized in that: When the rotating disk rotates clockwise, it drives the slider, load-bearing connecting shaft, and connecting pulley to move inward toward the cross elastic rod, reducing the length of the cantilever beam and increasing the natural frequency of the dynamic vibration absorber. Conversely, the natural frequency of the dynamic vibration absorber decreases. In conjunction with the built-in PID control system of the dynamic vibration absorber, it can track the control frequency when the mechanical characteristic frequency changes.

10. The intelligent semi-active dynamic vibration absorber according to claim 9, characterized in that: This intelligent semi-active dynamic vibration absorber is fixed to the controlled mechanical equipment via a base plate. An acceleration feedback sensor or speed sensor is placed at the fixed position to monitor the characteristic frequency of the controlled mechanical equipment. The acceleration feedback sensor or speed sensor is connected to the PID control system and circuit board. When the mechanical equipment is running, the acceleration feedback sensor or speed sensor will collect the controlled characteristic frequency. When the characteristic frequency changes, the built-in rechargeable battery supplies power to the built-in circuit board and servo motor. The circuit board controls the servo motor to rotate, which drives the connecting rod to move. This causes the slider, load-bearing connecting shaft, and connecting pulley to move along the middle groove of the cross elastic rod, changing the length of the cantilever beam. This makes the natural frequency of the dynamic vibration absorber the same as the vibration frequency of the controlled mechanical equipment, thereby achieving the effect of wide-frequency vibration control.

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