A vibration damping mechanism for a floating platform and its application method

Abstract

This invention discloses a vibration damping mechanism for a floating platform and its usage method. The vibration damping mechanism is positioned between a marine buoy and the floating platform. The mechanism includes a mounting plate on the marine buoy, a hopper on the mounting plate, and several sets of electromagnets and rubber columns alternately arranged inside the hopper. The electromagnets have opposite polarities. A contact friction plate, connected to the floating platform, is located at the top of the hopper and passes through the hopper, abutting against the electromagnets or rubber columns. Spring damping components are located on both sides of the contact friction plate, with one end connected to the contact friction plate and the other end connected to the mounting plate. This invention combines active and passive vibration damping, enabling it to adapt to different vibration conditions and improving vibration damping performance and reliability.

Description

Technical Field

[0001] This invention relates to a vibration damping mechanism, and more particularly to a vibration damping mechanism for a floating platform and its method of use. Background Technology

[0002] Floating platforms mounted on buoys can support equipment such as drones and maritime monitoring stations for use at sea. However, the impact of waves can cause significant turbulence on the buoys, leading to vibrations and instability on the floating platform. This poses safety hazards to the drones and other equipment docked on the platform and affects operational efficiency. Currently, drone docking on water relies on the performance of the drones themselves and large ships or large marine operation platforms, placing high demands on the drone equipment's performance and limiting its applicability. Existing vibration reduction methods for floating platforms mainly rely on damping plates and frequency-modulated mass dampers. The damping plate is connected to the floating platform via slings (or booms). When the platform vibrates, the slings move the damping plate, stirring up the still water in deep water. The reaction force provided by the still water suppresses the vibration of the platform. However, when the water in deep water is flowing, the damping plate loses its vibration-damping effect on the platform, and ocean currents are a common phenomenon. A frequency-modulated mass damper consists of a mass block (mass m), a damper, and a spring (stiffness k). When its natural frequency matches the vibration frequency of the platform, the frequency-modulated mass damper has a good vibration reduction effect on the platform. However, when the platform's vibration frequency changes slightly, its vibration reduction effect essentially disappears. This demonstrates that due to the complex and variable marine environment, existing vibration reduction devices have relatively poor vibration reduction performance. Summary of the Invention

[0003] Purpose of the invention: The present invention aims to provide a vibration damping mechanism for a floating platform that combines active and passive vibration damping, thereby improving vibration damping performance and reliability, and its method of use.

[0004] Technical Solution: The present invention discloses a vibration damping mechanism for a floating platform. The vibration damping mechanism is disposed between a marine buoy and a floating platform. The vibration damping mechanism includes an installation plate on the marine buoy, a hopper on the installation plate, and several sets of electromagnets and rubber columns alternately arranged inside the hopper. The electromagnets have opposite polarities to provide mutual repulsion. A contact friction plate connected to the floating platform is provided at the top of the hopper, and the contact friction plate passes through the hopper and abuts against the electromagnets or rubber columns. Spring vibration damping components are respectively provided on both sides of the contact friction plate, with one end of the spring vibration damping component connected to the contact friction plate and the other end connected to the installation plate.

[0005] Preferably, the electromagnet is electrically connected to the control system, and the control system controls the electromagnet to be energized and adjusts the strength of the repulsive force.

[0006] Preferably, an acceleration sensor for detecting the vibration signal of the water platform is provided on the contact friction plate, and the acceleration sensor is electrically connected to the control system.

[0007] Preferably, the contact friction plate is composed of two friction plates symmetrically arranged left and right, and the contact surfaces of the two friction plates are both arc-shaped, which is convenient for contact friction vibration reduction.

[0008] Preferably, the spring vibration reduction component includes an arc-shaped spring vibration reduction piece, the upper end of the spring vibration reduction piece is connected to the contact friction plate, and the lower end is connected to the mounting plate.

[0009] Preferably, a plurality of groups of the spring vibration reduction components are provided and arranged in a fishbone-shaped array.

[0010] Preferably, several groups of the spring vibration reduction components are arranged in sequence from the outside to the inside.

[0011] Preferably, the silo is detachably connected to the mounting plate.

[0012] Preferably, the silo is divided into a front silo and a rear silo. The front silo is arranged on the upper surface of the through hole of the mounting plate, and the rear silo is arranged on the lower surface of the through hole of the mounting plate; the front silo and the rear silo are detachably connected.

[0013] The usage method of a vibration reduction mechanism for a water platform according to the present invention includes the following steps:

[0014] (a) Set the system acceleration threshold as At;

[0015] (b) Compare the measured acceleration As detected by the acceleration sensor provided on the contact friction plate with the system acceleration threshold At;

[0016] (c) When the measured acceleration As < At, the electromagnet in the silo is not powered on. At this time, the contact friction plate, the spring vibration reduction component and the rubber column work together to reduce vibration; the contact friction plates rub against each other and rub against the opening of the silo, and at the same time drive the spring vibration reduction component to generate elastic deformation, and the downward displacement of the contact friction plate drives the electromagnet to squeeze the rubber column, jointly realizing passive vibration reduction;

[0017] (d) When the measured acceleration As ≥ At, the control system controls the electromagnet in the silo to be powered on, and adjusts the repulsion strength of the electromagnet for active vibration suppression, and at the same time the contact friction plate, the spring vibration reduction component and the rubber column jointly perform passive vibration reduction;

[0018] (e) When the measured acceleration As decreases to less than At, the electromagnet stops working, the active vibration reduction ends, and the passive vibration reduction continues to work.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. It applies a hybrid vibration reduction method combining active and passive vibration reduction to a floating platform, adopting different vibration reduction methods according to different wave sizes, thereby achieving significant vibration reduction of the floating platform, improving the vibration reduction performance of the vibration reduction mechanism, and expanding the scope of application; 2. All spring damping plates in the vibration damper form a fishbone array structure, which, combined with biomimetic technology, increases the strength of the vibration reduction mechanism and improves its reliability. Attached Figure Description

[0020] Figure 1 This is a side view of the structure of the present invention;

[0021] Figure 2 This is a front view of the structure of the present invention;

[0022] Figure 3 This is a cross-sectional view of the structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the structural installation of the present invention;

[0024] Figure 5 This is a flowchart illustrating the usage method of the present invention. Detailed Implementation

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown, the present invention discloses a vibration damping mechanism for a floating platform, positioned between a buoy 9 and a floating platform 10. It includes a mounting plate 1, a storage tank 2, a spring damping assembly 3, and a contact friction plate 4. The mounting plate 1 has threaded holes on its lower surface for connection to the upper surface of the buoy 9 using screws. The storage tank 2 is vertically positioned within a through hole on the mounting plate 1. The storage tank 2 contains two sets of alternately arranged electromagnets 5 and rubber columns 6, with the two sets of electromagnets 5 having opposite polarities to provide mutual repulsion. The electromagnets 5 are electrically connected to a control system, which controls the energization of the electromagnets and adjusts the strength of the repulsion. The control system is a microcontroller. The upper surface of the storage tank 2 has a contact friction plate 4, the lower end of which passes through a notch at the upper end of the storage tank 2 and abuts against the electromagnet, while the upper end is fixed to the lower surface of the floating platform 10.

[0027] The contact friction plate 4 consists of two symmetrically arranged friction plates, with both contact surfaces being arc-shaped to facilitate contact friction and vibration reduction. The contact friction plate 4 is equipped with an acceleration sensor 7 for detecting the vibration acceleration signal generated by the impact on the water platform 10. The acceleration sensor 7 is electrically connected to the control system.

[0028] When vibrating, the two friction plates of the contact friction plate 4 rub against each other and rub against the notch of the bin to achieve friction damping, and the up and down movement of the contact friction plate 4 drives the electromagnet 5 to squeeze the rubber column 6 to achieve damping.

[0029] The spring damping component 3 is arranged between the contact friction plate 4 and the mounting plate 1. The spring damping component 3 includes several groups of arc-shaped spring damping pieces in a fishbone array. The upper end of the spring damping piece is connected to the contact friction plate 4, and the lower end is connected to the mounting plate 1. In this embodiment, 3 groups of spring damping pieces are arranged, and they are arranged from the outside to the inside in sequence. The upper end of the left spring damping piece is connected to the left friction plate by screws, and the lower end is connected to the mounting plate by a pressing plate 8 and screws. The upper end of the right spring damping piece is connected to the right friction plate by screws, and the lower end is connected to the mounting plate by a pressing plate 8 and screws.

[0030] For easy disassembly, installation and adjustment of the size of the electromagnet and the rubber column, the bin can be detachably connected to the mounting plate. At the same time, the bin 2 is set as a front bin 21 and a rear bin 22. The front bin 21 is arranged on the upper surface of the through hole of the mounting plate 1, and the rear bin 22 is arranged on the lower surface of the through hole of the mounting plate. The through hole of the mounting plate 1, the inner diameter of the front bin 21, and the inner diameter of the rear bin 22 are the same.

[0031] As Figure 5 shown, the usage method of a vibration damping mechanism for a water platform described in the present invention includes the following steps:

[0032] (1) Set the system acceleration threshold as At;

[0033] (2) When the sea buoy 9 is affected by waves and jolts are transmitted to the water platform 10, the acceleration sensor 7 arranged on the contact friction plate 4 detects the vibration signal of the water platform, and after signal processing, it is transmitted to the single-chip microcomputer; compare the measured acceleration As captured by the single-chip microcomputer with the system acceleration threshold At;

[0034] (3) When the measured acceleration As < At, the single-chip microcomputer controls the electromagnet in the bin to be powered off, and the vibration damping mechanism only performs passive vibration damping, that is, the contact friction plate 4, the spring damping component 3 and the rubber column 6 work simultaneously to jointly achieve passive vibration damping; the contact friction plate 4 is forced to move downward, causing the three groups of spring damping pieces to undergo elastic deformation to relieve a part of the impact force first. The two friction plates rub against each other, and the two friction plates also rub against the notch of the bin. Under the action of friction damping, a part of the energy is dissipated. The downward displacement of the contact friction plate 4 drives the electromagnet to squeeze the rubber column, and the friction damping effect of the rubber column dissipates a part of the energy to achieve basic passive vibration damping;

[0035] (4) When the measured acceleration As≥At, the microcontroller controls the electromagnet in the bin to be energized and adjusts the repulsive force of the electromagnet to actively reduce vibration. The repulsive force between the electromagnets can resist the vibration and impact caused by the large impact force. At the same time, the contact friction plate 4, the spring damping component 3 and the rubber column 6 work together to passively reduce vibration.

[0036] (5) When the measured acceleration As decreases to less than At, the electromagnet stops working, the active vibration reduction ends, and the passive vibration reduction continues to work.

Claims

1. A method of using a vibration damping mechanism for a floating platform, characterized in that, The shock absorption mechanism is arranged between the offshore buoy (9) and the water platform (10). The shock absorption mechanism includes a mounting plate (1) arranged on the offshore buoy (9). A silo (2) is arranged on the mounting plate (1). A number of groups of electromagnets (5) and rubber columns (6) are alternately arranged in the silo (2), and the polar directions of the electromagnets (5) are opposite. A contact friction plate (4) connected to the water platform (10) is arranged at the top of the silo (2). The contact friction plate (4) passes through the silo and abuts against the electromagnet or the rubber column. Spring shock absorption components (3) are respectively arranged on both sides of the contact friction plate (4). One end of the spring shock absorption component (3) is connected to the contact friction plate (4), and the other end is connected to the mounting plate (1). The electromagnet (5) is electrically connected to the control system, and the control system controls the electromagnet (5) to be powered on and adjusts the strength of the repulsive force. An acceleration sensor (7) for detecting the vibration signal of the water platform is arranged on the contact friction plate (4). The acceleration sensor (7) is electrically connected to the control system. The contact friction plate (4) consists of two friction plates symmetrically arranged left and right, and the contact surfaces of the two friction plates are arc-shaped. The spring shock absorption component (3) includes an arc-shaped spring shock absorption piece. The upper end of the spring shock absorption piece is connected to the contact friction plate (4), and the lower end is connected to the mounting plate (1). The usage method includes the following steps: (a)Set the system acceleration threshold as At; (b)Compare the measured acceleration As detected by the acceleration sensor arranged on the contact friction plate with the system acceleration threshold At; (c)When the measured acceleration As < At, the electromagnet in the silo is not powered on. At this time, the contact friction plate (4), the spring shock absorption component (3) and the rubber column (6) work together to absorb shock. The contact friction plate (4) rubs against each other and rubs against the opening of the silo (2), and at the same time drives the spring shock absorption component (3) to undergo elastic deformation. And the downward displacement of the contact friction plate (4) drives the electromagnet to squeeze the rubber column, jointly realizing passive shock absorption; (d) When the measured acceleration At that time, the control system controls the electromagnet in the bin to be energized and adjusts the repulsive force of the electromagnet to actively suppress vibration, while the contact friction plate (4), spring damping assembly (3) and rubber column (6) work together to passively dampen vibration. (e)When the measured acceleration As decreases to be less than At, the electromagnet stops working, the active shock absorption ends, and the passive shock absorption continues to work.

2. The method of using a vibration damping mechanism for a floating platform according to claim 1, characterized in that, A number of groups of the spring shock absorption components (3) are arranged in a fishbone-shaped array.

3. The method of using a vibration damping mechanism for a floating platform according to claim 2, characterized in that, A number of groups of the spring shock absorption components (3) are arranged in sequence from outside to inside.

4. The method of using a vibration damping mechanism for a floating platform according to claim 1, characterized in that, The silo (2) is detachably connected to the mounting plate (1).

5. The method of using a vibration damping mechanism for a floating platform according to claim 4, characterized in that, The silo (2) is divided into a front silo (21) and a rear silo (22). The front silo (21) is arranged on the upper surface of the through hole of the mounting plate (1), and the rear silo (22) is arranged on the lower surface of the through hole of the mounting plate. The front silo (21) and the rear silo (22) are detachably connected.

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