A full-submerged anti-vibration system and method driven by sea water reaction power

Abstract

This invention provides a fully submersible vibration-damping system that uses vibration energy to drive seawater reaction force, comprising: a support frame, a flow guide, and a seawater reaction force turbine and an electromagnetic damper placed within the flow guide. The electromagnetic damper is connected to the seawater reaction force turbine, and the support frame and the flow guide are connected to the seawater reaction force turbine. The flow guide and the seawater reaction force turbine are mounted on the outside of the columns of the floating platform to be vibration-damped via the support frame. The flow guide restricts the direction of seawater flow, and the seawater reaction force turbine provides a counterforce based on the inflowing seawater to prevent the flow guide from sinking or floating. The electromagnetic damper provides rotational damping for the seawater reaction force turbine. This invention solves the problems of poor vibration reduction effect and high cost of existing floating wind turbines.

Description

Technical Field

[0001] This invention relates to the field of offshore floating wind turbine technology, and in particular to a fully submersible anti-vibration system and method that uses vibration energy to drive seawater reaction force. Background Technology

[0002] Offshore floating wind turbines can efficiently convert high-quality wind energy at sea into a continuous supply of clean electricity. Based on semi-submersible floating platforms, offshore wind turbines do not directly contact the seabed, so they are widely used in deep-sea areas.

[0003] However, due to the massive structure of offshore floating wind turbines, they are subject to the coupled effects of wind and wave loads, making long-term vibration of the turbine body and platform unavoidable. Prolonged vibration can cause material fatigue, and in severe cases, lead to tipping over or structural fracture, posing a significant safety hazard.

[0004] Currently, commonly used vibration reduction devices and methods for floating wind turbines mainly include: mooring systems, tuned mass dampers, and high-strength structures. Mooring systems for offshore floating wind turbines can only limit the displacement of the floating platform within a certain range, and their vibration reduction and anti-vibration effect on the rigid body vibration of the offshore floating wind turbine is poor. Tuned mass dampers are limited by their operating frequency and are ineffective in the face of complex and variable offshore wind and wave conditions; secondly, during the movement of the mass block, it is prone to collisions with other structures, causing damage to the wind turbine. Increasing the overall strength of the floating wind turbine would increase manufacturing and transportation costs, reducing investment returns. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a fully submersible anti-vibration system and method that uses vibration energy to drive seawater reaction force, which solves the problems of poor vibration reduction effect and high cost of floating wind turbines in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A fully submersible vibration-resistant system that uses vibration energy to drive seawater reaction force, comprising:

[0008] Support frame, fairing, and seawater reaction force turbine and electromagnetic damper placed inside the fairing;

[0009] The electromagnetic damper is connected to the seawater reaction force turbine, and the bracket and the guide shroud are connected to the seawater reaction force turbine.

[0010] The flow guide and the seawater reaction force turbine are mounted on the outside of the column of the floating platform to be vibration-damped via a bracket. The flow guide is used to restrict the direction of seawater flow, and the seawater reaction force turbine is used to provide a reverse force to prevent the flow guide from sinking or floating based on the inflowing seawater. The electromagnetic damper is used to provide rotational damping for the seawater reaction force turbine.

[0011] Preferably, the fairing and the seawater reaction turbine are installed below the horizontal plane.

[0012] Preferably, the electromagnetic damper is coaxially connected to the seawater reaction force turbine.

[0013] Preferably, the flow guide and the seawater reaction force turbine are installed along the radial direction of the floating platform to be vibration-damped.

[0014] A fully submersible vibration-resistant method that uses vibration energy to drive seawater reaction force includes:

[0015] The relative velocity difference between the guide fairing and the seawater is obtained based on the vibration of the floating platform to be vibration-damped.

[0016] The reaction force is generated by utilizing the relative velocity difference between the fairing and the seawater;

[0017] The reaction force is used to resist vibration of the floating platform to be damped.

[0018] Preferably, obtaining the relative velocity difference between the guide fairing and the seawater based on the vibration of the floating platform to be vibration-damped includes:

[0019] The vertical buoyancy of the fairing is obtained based on the vibration of the floating platform to be vibration-damped.

[0020] The relative velocity difference between the shroud and the seawater is obtained based on the vertical buoyancy and the seawater flow velocity.

[0021] Preferably, the formula for calculating the vertical buoyancy velocity of the fairing is:

[0022]

[0023] Where v is the vertical buoyancy velocity of the fairing, and r is the horizontal distance from the fairing to the rigid oscillation center of the floating platform. The angular velocity of the swaying vibration of the floating platform to be vibration-damped.

[0024] Preferably, the formula for calculating the reaction force is:

[0025]

[0026] c represents the overall damping of the vibration-damping system, and M represents the reaction force.

[0027] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0028] This invention provides a fully submersible vibration-damping system and method that uses vibration energy to drive seawater reaction force. By installing vibration-damping devices on the floating platform to be vibration-damped, this invention abstracts the dynamic system of the floating platform-seawater-vibration-damping device, utilizes the platform's own vibration energy to reduce its own vibration, improves the vibration reduction effect of the floating wind turbine, and reduces the vibration reduction cost of the floating wind turbine. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0030] Figure 1 This is a schematic diagram of the first structure of a fully submersible anti-vibration system that uses vibration energy to drive seawater reaction force, provided in an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the second structure of a fully submersible anti-vibration system that uses vibration energy to drive seawater reaction force, provided in an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the principle and flow of a fully submersible anti-vibration system that uses vibration energy to drive seawater reaction force, provided by an embodiment of the present invention.

[0033] Figure 4 A dynamic schematic diagram of a fully submersible vibration-resistant system that uses vibration energy to drive seawater reaction force, provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram illustrating the working mechanism of a fully submersible vibration-resistant system that uses vibration energy to drive seawater reaction force in response to abnormal vibrations on a floating platform, as provided in an embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the installation of the vibration-damping device provided in an embodiment of the present invention on an offshore wind turbine.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1- Flood fairing, 2- Seawater reaction force turbine, 3- Electromagnetic damper, 4- Support frame, 5- Wind turbine body, 6- Column of floating platform, 7- Vibration damping device. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] A fully submersible vibration-damping system and method that uses vibration energy to drive seawater reaction force solves the problems of poor vibration reduction effect and high cost of existing floating wind turbines.

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1-2 As shown, the present invention provides a fully submersible vibration-resistant system that uses vibration energy to drive seawater reaction force, comprising:

[0042] Support 4, flow guide 1, seawater reaction force turbine 2 and electromagnetic damper 3 placed inside flow guide 1;

[0043] The electromagnetic damper 3 is connected to the seawater reaction force turbine 2, and the bracket 4 and the guide shroud 1 are connected to the seawater reaction force turbine 2.

[0044] The flow guide 1 and the seawater reaction force turbine 2 are mounted on the outside of the column of the floating platform to be vibration-damped via a bracket 4. The flow guide 1 is used to restrict the direction of seawater flow, and the seawater reaction force turbine 2 is used to provide a reverse force to prevent the flow guide 1 from sinking or floating according to the inflowing seawater. The electromagnetic damper 3 is used to provide rotational damping for the seawater reaction force turbine 2.

[0045] The flow guide shroud 1, the seawater reaction force turbine 2, and the electromagnetic damper 3 together constitute the vibration damping device 7.

[0046] The vibration damping device 7 is used to generate a reaction force based on the self-vibration force of the floating platform to be damped and the seawater, and to use the reaction force to dampen the floating platform to be damped.

[0047] Furthermore, this embodiment also discloses the specific working principle of a fully submersible anti-vibration system that uses vibration energy to drive seawater reaction force: starting from the working environment of a floating wind turbine, it utilizes the dynamic characteristics of seawater itself. Specifically, it uses the vibration energy of the floating platform itself as the driving energy, understanding the floating platform as a rigid system and the seawater and vibration damping device as elastic systems, requiring no additional energy input. Therefore, the entire floating platform, seawater, and anti-vibration device 7 can be equivalent to a single-mass, multi-spring, and multi-damped dynamic system. In this system, the reaction force of the seawater comes from the impact kinetic energy of the relative velocity difference between the floating platform and the seawater, which is equivalent to the restoring force of a spring. The system is provided with equivalent damping by controlling the relative flow velocity of the seawater, and the power source is the rigid swaying vibration force of the floating platform itself.

[0048] Specifically, such as Figure 3 As shown, when the floating platform experiences abnormal rigid swaying vibration, the platform's own vibration energy is transmitted to the vibration damping device 7 through the support 4. The vibration damping device 7, driven by the support 4, has a relative velocity difference with the surrounding seawater. Under the action of the relative velocity difference, the seawater impacts the turbine blades and generates a reaction force. The electromagnetic damper 3 generates rotational damping, limiting the turbine blade speed and seawater flow. Under the reaction force of the seawater, the turbine rotates, which can be equivalent to damping to dissipate the kinetic energy of the sea. The vibration energy of the floating platform is reduced, and the vibration is controlled.

[0049] Specifically, the vibration damping device 7 is installed below the water surface. The entire device is installed below the water surface, therefore it is fully submersible.

[0050] Furthermore, such as Figure 4 As shown, the floating platform is understood as a rigid system, while the seawater and vibration damping device are understood as elastic systems, requiring no additional energy input. Therefore, the entire floating platform, seawater, and vibration damping device 7 can be equivalent to a dynamic system with a single mass, multiple springs, and multiple damping.

[0051] Furthermore, such as Figure 5 As shown, when the mass in the system vibrates and sways, it generates a linear velocity at the edge, and the sea and water anti-vibration system generates a reaction force, which is equivalent to the spring restoring force and damping force in the dynamic system.

[0052] Specifically, when the semi-submersible platform of the offshore wind turbine experiences rigid swaying vibration, the fully submersible anti-vibration device 7 installed on the outside of the column of the platform foundation moves vertically up and down under the influence of the platform, and there is a relative speed difference with the seawater.

[0053] Driven by the velocity difference, seawater surges into the guide shield 1 of the vibration damping device 7, subsequently impacting the blades of the seawater reaction turbine 2, providing a counterforce to prevent the vibration damping device 7 from floating or sinking. The guide shield 1 serves to restrict the direction of seawater flow, fully utilizing the impact force of the seawater. This part can be considered as an equivalent spring in the dynamic system of the floating platform-seawater-vibration damping device 7. The electromagnetic damper 3 is coaxially connected to the seawater reaction turbine 2, providing rotational damping for the turbine, thereby controlling the turbine's speed and torque. A portion of the seawater's kinetic energy driving the turbine's rotation is dissipated. This part can be considered as equivalent damping in the dynamic system of the floating platform-seawater-vibration damping device 7.

[0054] Furthermore, Figure 6 This is a schematic diagram of the installation of vibration damping devices on an offshore wind turbine, including the wind turbine body 5, a semi-submersible floating platform, and vibration damping devices 7. The vibration damping devices 7 are installed on the outside of the floating platform's columns, below sea level.

[0055] Furthermore, the vibration damping device 7 and the support 4 are installed radially along the floating platform to be damped.

[0056] This embodiment also provides a fully submersible vibration-resistant method that uses vibration energy to drive seawater reaction force, including:

[0057] The relative velocity difference between the vibration damping device 7 and the seawater is obtained based on the vibration of the floating platform to be damped.

[0058] The reaction force is obtained by utilizing the relative velocity difference and based on the vibration-damping device 7;

[0059] The reaction force is used to resist vibration of the floating platform to be damped.

[0060] Furthermore, obtaining the relative velocity difference between the vibration-damping device 7 and the seawater based on the vibration of the floating platform to be vibration-damped includes:

[0061] The vertical buoyancy of the vibration damping device 7 is obtained based on the vibration of the floating platform to be damped.

[0062] The relative velocity difference between the vibration-damping device 7 and the seawater is obtained based on the vertical buoyancy velocity and the seawater flow velocity.

[0063] Specifically, when the angular velocity of the floating platform is constant, the formula for calculating the vertical buoyancy velocity of the anti-vibration device 7 is as follows:

[0064]

[0065] Where v is the vertical buoyancy velocity of the vibration damping device 7, and r is the horizontal distance from the vibration damping device 7 to the rigid sway center of the floating platform. The angular velocity of the swaying vibration of the floating platform to be vibration-damped.

[0066] Specifically, the formula for calculating the reaction force is:

[0067]

[0068] c represents the overall damping of the vibration damping system, and M represents the reaction force. When the vibration damping device is furthest from the center of the floating platform's overturning and swaying, it provides the maximum resistance torque, and the direction of the resistance torque is opposite to the direction of the platform's swaying vibration.

[0069] The beneficial effects of this invention are as follows:

[0070] This invention fully considers the working environment of offshore wind turbines, utilizing the natural characteristics of seawater and avoiding numerous complex structures. It uses the vibrational energy of the floating platform itself as the driving energy, treating the floating platform as a rigid system and the seawater and vibration damping device as elastic systems, requiring no additional energy input. The reaction force generated by the relative velocity difference between the platform and the seawater during its swaying vibration is equivalent to the restoring force and damping force of an anti-vibration spring, improving the vibration reduction effect of the floating wind turbine and reducing its vibration reduction cost.

[0071] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0072] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A fully submersible vibration-damping method using vibration energy to drive seawater reaction force, the method being implemented based on a fully submersible vibration-damping system using vibration energy to drive seawater reaction force, characterized in that, The fully submersible vibration-resistant system that uses vibration energy to drive seawater reaction force includes: Support frame, fairing, and seawater reaction force turbine and electromagnetic damper placed inside the fairing; The electromagnetic damper is connected to the seawater reaction force turbine, and the bracket and the guide shroud are connected to the seawater reaction force turbine. The flow guide and the seawater reaction force turbine are mounted on the outside of the column of the floating platform to be vibration-damped via a bracket. The flow guide is used to restrict the direction of seawater flow, and the seawater reaction force turbine is used to provide a reverse force to prevent the flow guide from sinking or floating according to the inflowing seawater. The electromagnetic damper is used to provide rotational damping for the seawater reaction force turbine. The method includes: The relative velocity difference between the guide fairing and the seawater is obtained based on the vibration of the floating platform to be vibration-damped. The reaction force is generated by utilizing the relative velocity difference between the fairing and the seawater; The reaction force is used to resist vibration of the floating platform to be damped; The process of obtaining the relative velocity difference between the guide fairing and the seawater based on the vibration of the floating platform to be vibration-damped includes: The vertical buoyancy of the fairing is obtained based on the vibration of the floating platform to be vibration-damped. The relative velocity difference between the shroud and the seawater is obtained based on the vertical buoyancy and the seawater flow velocity.

2. The fully submersible vibration-resistant method using vibration energy to drive seawater reaction force according to claim 1, characterized in that, The fairing and the seawater reaction turbine are installed below the horizontal plane.

3. The fully submersible vibration-resistant method using vibration energy to drive seawater reaction force according to claim 1, characterized in that, The electromagnetic damper is coaxially connected to the seawater reaction force turbine.

4. The fully submersible vibration-resistant method using vibration energy to drive seawater reaction force according to claim 1, characterized in that, The flow guide and the seawater reaction force turbine are installed along the radial direction of the floating platform to be vibration-damped with the support.

5. The fully submersible vibration-resistant method using vibration energy to drive seawater reaction force according to claim 1, characterized in that, The formula for calculating the vertical buoyancy velocity of the fairing is: ； Where v is the vertical buoyancy velocity of the fairing, and r is the horizontal distance from the fairing to the rigid oscillation center of the floating platform to be vibration-damped. The angular velocity of the swaying vibration of the floating platform to be vibration-damped.

6. The fully submersible vibration-resistant method using vibration energy to drive seawater reaction force according to claim 5, characterized in that, The formula for calculating the reaction force is: ； c represents the overall damping of the vibration-damping system, and M represents the reaction force.

Images