Multi-stage vibration reduction device and vibration reduction method for floating type offshore wind turbine platform

Abstract

The invention discloses a multi-stage vibration reduction device and method for a floating offshore wind turbine platform, and relates to the technical field of vibration reduction of offshore wind turbine platforms. The multi-stage vibration reduction device comprises a multi-stage vibration reduction mechanism arranged in a buoy; the multi-stage vibration reduction mechanism comprises a mass block, and a first-stage vibration reduction mechanism, a second-stage vibration reduction mechanism and a third-stage vibration reduction mechanism which are sequentially arranged from top to bottom; the mass block is used for being arranged in the buoy. The invention discloses a vibration reduction method for a floating type offshore wind turbine platform. According to the vibration reduction method, in the horizontal direction, a mass block is matched with a first-stage vibration reduction mechanism and a second-stage vibration reduction mechanism to achieve vibration reduction and energy consumption; in the vertical direction, the mass block is matched with the first-stage vibration reduction mechanism, the second-stage vibration reduction mechanism and the third-stage vibration reduction mechanism to achieve vibration reduction and energy consumption. Multi-stage horizontal and vertical vibration reduction can be achieved, large-amplitude vibration of the offshore wind turbine platform is effectively restrained, and potential safety hazards are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction of offshore wind turbine platforms, and particularly to a multi-stage vibration reduction device and method for a floating offshore wind turbine platform. Background Technique

[0002] With the continuous development of the global economy, the demand for energy is constantly climbing. Traditional fossil energy faces many problems such as resource depletion and environmental pollution. As a clean and renewable energy, offshore wind power has become one of the important choices for energy transformation.

[0003] As the development and utilization of offshore wind power resources in shallow waters gradually approaches saturation, the deep sea area provides a broader space for the large-scale development of offshore wind power. Coupled with the richer deep sea wind energy resources, higher and more stable wind speeds, the construction of offshore wind farms is gradually moving towards the deep sea. In the deep sea area, floating wind turbine foundations are usually used, and their foundation forms mainly include four types: barge type, semi-submersible type, column type, and tension leg type.

[0004] Floating wind turbines will bear long-term dynamic loads such as wind, waves, and currents in a complex marine environment. Especially under the action of strong storm loads, the floating wind turbine foundation platform will generate large-amplitude horizontal and vertical vibrations. If not controlled, it will bring great potential safety hazards to the safety of the unit. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-stage vibration reduction device and method for a floating offshore wind turbine platform to solve the problems existing in the above-mentioned prior art, achieve multi-stage vibration reduction in the horizontal and vertical directions, effectively suppress the large-amplitude vibration of the offshore wind turbine platform, and reduce potential safety hazards.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention provides a multi-stage vibration damping device for a floating offshore wind turbine platform, including a multi-stage vibration damping mechanism, which is used to be arranged in a floating cylinder; the multi-stage vibration damping mechanism corresponds to the floating cylinder one by one; the multi-stage vibration damping mechanism includes a mass block and a first-stage vibration damping mechanism, a second-stage vibration damping mechanism and a third-stage vibration damping mechanism arranged in sequence from top to bottom; the mass block is used to be arranged in the floating cylinder; the first-stage vibration damping mechanism includes a plurality of first elastic elements and a plurality of first dampers; the first elastic elements can elastically deform, one end of the first elastic elements is used to be fixedly connected to the inner wall of the floating cylinder, and the other end of the first elastic elements can be fixedly connected to the mass block; one end of the first damper has a telescopic piston rod, the free end of the piston rod forms one end of the first damper, one end of the first damper can be rotatably connected to the mass block with a point as the rotation center, and the other end of the first damper is used to be rotatably connected to the inner wall of the floating cylinder with a point as the rotation center; the second-stage vibration damping mechanism includes a housing, a core column and at least one annular vibration damper; the housing is used to be arranged in the floating cylinder and is connected to the inner wall of the floating cylinder through a connecting piece; the housing has a through hole penetrating up and down, the core column is arranged in the through hole, and the upper end of the core column is fixedly connected to the mass block; the annular vibration damper includes a plurality of second elastic elements, one end of each second elastic element is fixedly connected to the inner side wall of the through hole, and the other end of each second elastic element is fixedly connected to the outer side wall of the core column; each annular vibration damper is distributed up and down along the axis of the through hole; the third-stage vibration damping mechanism includes a rotating gear set, the rotating gear set is arranged in the floating cylinder, and the rotating gear set has a driving gear that can rotate; a rack is fixedly arranged at the lower end of the core column, and the driving gear meshes with the rack.

[0008] Preferably, it further includes a ballast water injection mechanism; the ballast water injection mechanism includes a controller, a water pump and a plurality of wave sensors; the water pump is used to be fixed on the connecting frame of the offshore wind turbine platform; one water inlet of the water pump is communicated with seawater, the other water inlet of the water pump is provided with a plurality of branch pipes, the branch pipes correspond to the floating cylinders one by one, and the end of the branch pipe is used to be communicated with the ballast water tank of the floating cylinder; the wave sensors correspond to the floating cylinders one by one, and the controller is communicatively connected to the water pump and each wave sensor; the water pump can inject water into the ballast water tank of the floating cylinder through the branch pipe or pump out the water in the ballast water tank of the floating cylinder through the branch pipe.

[0009] Preferably, the primary vibration damping mechanism includes an annular bracket, a plurality of the first elastic elements, and a plurality of the first dampers; the center of gravity of the mass block is located on the axis of the buoy; and the mass block is fixedly connected to the annular bracket; the first elastic elements are in an inclined posture, in the axial direction of the buoy, the upper end of the first elastic element is used for being fixedly connected to the inner wall of the buoy, and the lower end of the first elastic element is fixedly connected to the annular bracket; each of the first elastic elements is circumferentially distributed around the axis of the buoy; when the mass block is in a static state, the axis of the first damper is in a horizontal state, and universal ball heads for rotating around a point are provided at both ends of the first damper for connecting to the inner side wall of the buoy and the annular bracket.

[0010] Preferably, each of the first elastic elements and each of the first dampers are respectively circumferentially and uniformly distributed around the axis of the buoy; and one of the first dampers is provided between two adjacent ones of the first elastic elements.

[0011] Preferably, the core column includes an upper core rod, a longitudinal vibration damping and restoring device, and a lower core rod which are connected in sequence from top to bottom; the upper end of the upper core rod is fixedly connected to the mass block, and each of the annular dampers is arranged between the outer side wall of the upper core rod and the inner side wall of the through hole; the longitudinal vibration damping and restoring device includes an upper connecting plate, a lower connecting plate, and a plurality of longitudinal restoring elastic elements; the upper connecting plate is fixedly connected to the lower end of the upper core rod; each of the longitudinal restoring elastic elements is arranged between the upper connecting plate and the lower connecting plate, the longitudinal restoring elastic elements can elastically deform, the upper end of the longitudinal restoring elastic element is fixedly connected to the upper connecting plate, and the lower end of the longitudinal restoring elastic element is fixedly connected to the lower connecting plate; a limiting annular surface is arranged in the through hole, and the limiting annular surface can limit the lower connecting plate from moving towards the side of the limiting annular surface away from the upper core rod; the upper end of the lower core rod is fixedly connected to the lower connecting plate, and a rack is arranged at the lower end of the lower core rod.

[0012] Preferably, an annular stabilizing frame is fixedly arranged in the through hole; the connecting member includes a plurality of second dampers; each of the second dampers is circumferentially distributed around the axis of the housing; the second dampers are in an inclined posture, in the axial direction of the buoy, the upper end of the second damper is rotationally connected to the outer side wall of the housing around a point, and the lower end of the second damper is rotationally connected to the annular stabilizing frame around a point.

[0013] Preferably, the rotating gear set includes a ring gear, a central gear, the main gear, and a plurality of planetary gears; the ring gear can be fixedly connected to the inner wall of the floating barrel through a fixing frame; the central gear is coaxial with the ring gear, and the central gear can rotate relative to the ring gear around the axis of the ring gear; the main gear is fixedly connected coaxially with the central gear; each of the planetary gears is circumferentially distributed outside the outer wall of the central gear and between the inner wall of the ring gear around the axis of the central gear, and each of the planetary gears meshes with both the central gear and the ring gear, and each of the planetary gears is rotatably connected to a linkage frame.

[0014] Preferably, the rotating gear set further includes a rotating disk, the rotating disk is rotatably arranged in the floating barrel around a first axis, and the first axis is coaxial with the axis of the ring gear; the rotating disk is connected to one of the planetary gears through a connecting rod, and the planetary gear is rotatably arranged on the connecting rod; the connecting rod is fixedly connected to both the rotating disk and the linkage frame.

[0015] Preferably, the ballast water injection mechanism further includes a plurality of water level sensors communicatively connected to the controller; the water level sensors correspond to the floating barrels one by one; one of the water level sensors is respectively arranged in the ballast water tank of each floating barrel.

[0016] The present invention also provides a vibration reduction method for a floating offshore wind turbine platform, adopting the multi-stage vibration reduction device of the floating offshore wind turbine platform as described in any one of the above, including the following steps:

[0017] In the horizontal direction, the mass block generates a horizontal movement in the floating barrel. In the primary vibration reduction mechanism, each of the first elastic elements and each of the first dampers can generate a damping force in the horizontal direction to dissipate the energy of the horizontal movement of the mass block; in the secondary vibration reduction mechanism, the horizontal movement of the mass block drives the core column to synchronously generate a horizontal movement, and each of the second elastic elements of the annular damper can generate a damping force in the horizontal direction to dissipate the energy of the horizontal movement of the core column.

[0018] Vertically, the mass block generates vertical movement within the buoy. In the primary vibration damping mechanism, each of the first elastic elements and each of the first dampers can generate damping forces in the vertical direction to dissipate the energy of the mass block's vertical movement. In the secondary vibration damping mechanism, the vertical movement of the mass block drives the core column to synchronously generate vertical movement. Each of the second elastic elements of the annular damper can generate damping forces in the vertical direction to dissipate the energy of the core column's vertical movement. In the tertiary vibration damping mechanism, the vertical movement of the core column can drive the rack to move vertically and drive the main gear to rotate. The meshing of the main gear and the rack can generate damping forces in the vertical direction, and through the rotation of each gear of the rotating gear set, the energy of the rack's vertical movement is dissipated.

[0019] The present invention has achieved the following technical effects compared with the prior art:

[0020] The multi-stage vibration damping device of the floating offshore wind turbine platform provided by the present invention weakens the vibration of the buoy in the horizontal and vertical directions through the cooperation of the mass block with the primary vibration damping mechanism, secondary vibration damping mechanism, and tertiary vibration damping mechanism. Each of the first elastic elements and each of the first dampers of the primary vibration damping mechanism can provide damping forces in the horizontal and vertical directions to suppress the movement in the horizontal and vertical directions. Each of the second elastic elements of the annular damper of the secondary vibration damping mechanism can provide damping forces in the horizontal and vertical directions to the core column, thereby suppressing its movement in the horizontal and vertical directions and achieving the vibration damping effect. When the rack moves vertically, the rotating gear set of the tertiary vibration damping mechanism can generate mechanical energy consumption through the friction between the main gear and the rack, etc., to suppress the vertical movement of the rack in the vertical direction. Each vibration damping mechanism works together to form a multi-stage collaborative vibration damping and hierarchical energy consumption effect, effectively suppressing the large-amplitude vibration of the offshore wind turbine platform and reducing potential safety hazards. Moreover, the overall assembly is convenient and can be installed on land without offshore operations, which is convenient for installation and saves manpower and material resources.

[0021] The present invention also provides a vibration damping method for a floating offshore wind turbine platform. Through a multi-stage collaborative energy consumption mechanism formed by multiple vibration damping mechanisms, dynamic vibration suppression is achieved in the horizontal and vertical directions, providing core technical support for the long-term stable operation of the floating wind turbine under harsh sea conditions. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the overall structure of the multi-stage vibration damping device for a floating offshore wind turbine platform provided by the present invention;

[0024] Figure 2 For Figure 1 Schematic diagram of the structure installed on the floating offshore wind turbine platform;

[0025] Figure 3 Top view of the structure inside a single floating cylinder in the multi-stage vibration damping device for a floating offshore wind turbine platform provided by the present invention;

[0026] Figure 4 Internal structure schematic diagram of the secondary vibration damping mechanism in the multi-stage vibration damping device for a floating offshore wind turbine platform provided by the present invention;

[0027] Figure 5 For Figure 4 Top view;

[0028] Figure 6 Schematic diagram of the structure of the multi-stage vibration damping device for a floating offshore wind turbine platform provided by the present invention excluding the ballast water injection mechanism;

[0029] Figure 7 Structural diagram of a floating wind turbine installed with the multi-stage vibration damping device for a floating offshore wind turbine platform provided by the present invention;

[0030] Figure 8 For Figure 7 Partial structural cross-sectional view.

[0031] In the figure:

[0032] 10 - Mass block;

[0033] 20 - Primary vibration damping mechanism; 21 - First elastic element; 22 - First damper;

[0034] 30 - Secondary vibration damping mechanism; 31 - Outer shell; 311 - Limiting ring surface; 32 - Upper core rod; 33 - Longitudinal vibration damping and reset device; 34 - Ring-shaped damper; 35 - Rack; 36 - Second damper; 37 - Universal ball head;

[0035] 40 - Ring-shaped stabilizing frame;

[0036] 50 - Tertiary vibration damping mechanism; 51 - Main driving gear; 52 - Central gear; 53 - Planet gear; 531 - Linkage frame; 54 - Ring gear; 55 - Rotating disk; 551 - Connecting rod;

[0037] 60 - Ballast water injection mechanism; 61 - Controller; 62 - Water pump; 621 - Branch pipe; 63 - Wave sensor; 64 - Water level sensor;

[0038] 70 - Floating cylinder; 71 - Connecting frame. Specific implementation manners

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] The purpose of the present invention is to provide a multi-stage vibration damping device and method for a floating offshore wind turbine platform, so as to solve the problems existing in the prior art, achieve multi-stage horizontal and vertical vibration damping, effectively suppress the large-amplitude vibration of the offshore wind turbine platform, and reduce potential safety hazards.

[0041] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0042] Embodiment 1

[0043] This embodiment provides a multi-stage vibration damping device for a floating offshore wind turbine platform, as Figures 1 to 8As shown in the figure, it includes a multi-stage damping mechanism, which is used to be arranged in the buoy 70; the multi-stage damping mechanism corresponds to the buoy 70 one by one; the multi-stage damping mechanism includes a mass block 10 and a first-stage damping mechanism 20, a second-stage damping mechanism 30, and a third-stage damping mechanism 50 arranged successively from top to bottom; the mass block 10 is used to be arranged in the buoy 70; the first-stage damping mechanism 20 includes a plurality of first elastic elements 21 and a plurality of first dampers 22; the first elastic elements 21 can elastically deform, one end of the first elastic element 21 is used to be fixedly connected to the inner wall of the buoy 70, and the other end of the first elastic element 21 can be fixedly connected to the mass block 10; one end of the first damper 22 has a telescopic piston rod, the free end of the piston rod forms one end of the first damper 22, one end of the first damper 22 can be rotatably connected to the mass block 10 with a point as the rotation center, and the other end of the first damper 22 is used to be rotatably connected to the inner wall of the buoy 70 with a point as the rotation center (the first elastic elements 21 and the first dampers 22 can be arranged with a horizontal axis or an inclined axis. When the mass block 10 generates longitudinal movement, the first elastic elements 21 and the first dampers 22 can be pulled to make their axes inclined. The first elastic elements 21 and the first dampers 22 in the inclined state can generate damping forces in all directions through their longitudinal component forces and horizontal component forces); the second-stage damping mechanism 30 includes a housing 31, a core column, and at least one annular damper 34; the housing 31 is used to be arranged in the buoy 70 and is connected to the inner wall of the buoy 70 through a connecting piece; the housing 31 has a through hole penetrating up and down, the core column is inserted into the through hole, and the upper end of the core column is fixedly connected to the mass block 10; the annular damper 34 includes a plurality of second elastic elements, one end of each second elastic element is fixedly connected to the inner side wall of the through hole, and the other end of each second elastic element is fixedly connected to the outer side wall of the core column; each annular damper 34 is distributed up and down along the axis of the through hole; the third-stage damping mechanism 50 includes a rotating gear set, the rotating gear set is arranged in the buoy 70, and the rotating gear set has a main gear 51 that can rotate; a rack 35 is fixedly arranged at the lower end of the core column, and the main gear 51 meshes with the rack 35.

[0044] The vibration reduction of the floating barrel 70 in the horizontal and vertical directions is achieved through the cooperation of the mass block 10, the first-level vibration reduction mechanism 20, the second-level vibration reduction mechanism 30, and the third-level vibration reduction mechanism 50. Each first elastic element 21 and each first damper 22 of the first-level vibration reduction mechanism 20 can provide damping forces for the mass block 10 in the horizontal and vertical directions, so as to suppress the movement in the horizontal and vertical directions. Each second elastic element of the annular damper 34 of the second-level vibration reduction mechanism 30 can provide damping forces for the core column in the horizontal and vertical directions, thereby suppressing its movement in the horizontal and vertical directions and achieving the vibration reduction effect. When the rotating gear set of the third-level vibration reduction mechanism 50 moves the rack 35 in the vertical direction, mechanical energy consumption is generated through the friction between the main gear 51 and the rack 35, etc., to suppress the vertical movement of the rack 35 in the vertical direction. Each vibration reduction mechanism works together to form a multi-level collaborative vibration reduction and hierarchical energy consumption effect, effectively suppressing the large-amplitude vibration of the offshore wind turbine platform and reducing potential safety hazards. Moreover, the overall assembly is convenient, and it can be installed on land without offshore operations, which is convenient for installation and saves manpower and material resources.

[0045] Among them, the relevant settings of the mass block 10 are described as follows:

[0046] Specifically, the mass block 10 adopts a spherical structure.

[0047] Specifically, the center of gravity of the mass block 10 coincides with the center of gravity of the annular support.

[0048] Specifically, a mating annular groove can be provided at the position of the mass block 10 corresponding to the annular support for installation.

[0049] Among them, the relevant settings of the first-level vibration reduction mechanism 20 are described as follows:

[0050] In an alternative embodiment of the present embodiment, preferably, as Figures 1 to 3 and Figure 6 shown, the first-level vibration reduction mechanism 20 includes an annular support, a plurality of first elastic elements 21, and a plurality of first dampers 22; the center of gravity of the mass block 10 is located on the axis of the floating barrel 70; and the mass block 10 is fixedly connected to the annular support; the first elastic elements 21 are in an inclined posture. In the axial direction of the floating barrel 70, the upper end of the first elastic element 21 is fixedly connected to the inner wall of the floating barrel 70, and the lower end of the first elastic element 21 is fixedly connected to the annular support; each first elastic element 21 is circumferentially distributed around the axis of the floating barrel 70; when the mass block 10 is in a static state, the axis of the first damper 22 is in a horizontal state (that is, the axis of the first damper 22 is perpendicular to the axis of the floating barrel 70 and lies on a horizontal plane), and universal ball heads 37 for point rotation centers are provided at both ends of the first damper 22 for connection with the inner side wall of the floating barrel 70 and the annular support.

[0051] In an alternative embodiment of the present embodiment, preferably, as Figures 1 to 3 andFigure 6 As shown, each first elastic element 21 and each first damper 22 are respectively circumferentially and uniformly distributed around the axis of the floating drum 70; and one first damper 22 is arranged between two adjacent first elastic elements 21.

[0052] Specifically, the first elastic element 21 can be a spring, and the first damper 22 is of the damper structure and type currently used for an offshore wind turbine platform, such as a hydraulic damper or a viscous damper, etc., which will not be elaborated here too much.

[0053] Specifically, both ends of the first elastic element 21 can be respectively connected to the corresponding positions through a rigid block.

[0054] Among them, the relevant setting description of the secondary vibration reduction mechanism 30:

[0055] In an alternative solution of this embodiment, preferably, as Figure 4 and Figure 5 shown, the core column includes an upper core rod 32, a longitudinal vibration reduction and reset device 33, and a lower core rod that are connected in sequence from top to bottom; the upper end of the upper core rod 32 is fixedly connected to the mass block 10, and each annular vibration reducer 34 (the annular vibration reducer 34 includes an inner ring plate, an outer ring plate, and a plurality of horizontally arranged second elastic elements located between the inner ring plate and the outer ring plate) is arranged between the outer side wall of the upper core rod 32 and the inner side wall of the through hole; the longitudinal vibration reduction and reset device 33 includes an upper connecting plate, a lower connecting plate, and a plurality of longitudinal reset elastic elements; the upper connecting plate is fixedly connected to the lower end of the upper core rod 32; each longitudinal reset elastic element is arranged between the upper connecting plate and the lower connecting plate, the longitudinal reset elastic element can elastically deform, the upper end of the longitudinal reset elastic element is fixedly connected to the upper connecting plate, and the lower end of the longitudinal reset elastic element is fixedly connected to the lower connecting plate; a limiting ring surface 311 is arranged in the through hole, and the limiting ring surface 311 can limit the lower connecting plate from moving towards the side away from the upper core rod 32; the upper end of the lower core rod is fixedly connected to the lower connecting plate, and a rack 35 is arranged at the lower end of the lower core rod.

[0056] Specifically, the longitudinal reset elastic element is a longitudinally arranged spring; the lower end of the through hole is a small hole for the lower core rod to pass through, and the constricted plane at the upper end of the small hole forms the limiting ring surface 311.

[0057] In an alternative solution of this embodiment, preferably, as Figure 1 , Figure 2 and Figure 6As shown, an annular stabilizing frame 40 is fixedly arranged inside the through hole; the connecting member includes a plurality of second dampers 36; the second dampers 36 are circumferentially distributed around the axis of the housing 31; the second dampers 36 are in an inclined posture, and in the axial direction of the floating cylinder 70, the upper end of the second damper 36 is rotatably connected to the outer side wall of the housing 31 with a point as the rotation center, and the lower end of the second damper 36 is rotatably connected to the annular stabilizing frame 40 with a point as the rotation center.

[0058] Specifically, both ends of the second damper 36 are also universal ball structures, that is, the same universal ball head 37 structure.

[0059] Specifically, when the mass block 10 swings in the vertical direction under the influence of the floating cylinder 70, the mass block 10 will drive the core column to move vertically, stretching the second elastic elements (such as horizontally arranged springs) up and down, thereby suppressing the vertical movement of the core column to a certain extent and weakening the swing of the mass block 10; similarly, when the mass block 10 swings horizontally, the core column will laterally squeeze the second elastic elements, thereby suppressing the horizontal swing of the core column; so the second elastic elements can suppress the movement in both the horizontal and vertical directions to achieve the vibration reduction effect; the setting of the longitudinal vibration reduction and reset device 33 makes a vertical force act on the housing 31 when the lower connecting plate moves to the limiting ring surface 311, and the second dampers 36 arranged around the housing 31 perform secondary vibration reduction.

[0060] Among them, the relevant settings of the three - stage vibration reduction mechanism 50 are described as follows:

[0061] In an alternative solution of this embodiment, preferably, as Figure 1 、 Figure 2 and Figure 6 shown, the rotating gear set includes a gear ring 54, a central gear 52, a leading gear 51 and a plurality of planetary gears 53; the gear ring 54 can be fixedly connected to the inner wall of the floating cylinder 70 through a fixing frame (the gear ring 54 is fixed on the annular stabilizing frame 40 through a fixing frame); the central gear 52 is coaxial with the gear ring 54, and the central gear 52 can rotate relative to the gear ring 54 around the axis of the gear ring 54; the leading gear 51 is fixedly coaxial with the central gear 52 (the leading gear 51 is fixedly connected to the central gear 52 through a connecting rod, and a through hole is arranged at the position of the connecting rod on the linkage frame 531); the planetary gears 53 are circumferentially distributed around the axis of the central gear 52 between the outer side wall of the central gear 52 and the inner side wall of the gear ring 54, and the planetary gears 53 are meshed with both the central gear 52 and the gear ring 54, and each planetary gear 53 is rotatably connected to the linkage frame 531.

[0062] Specifically, the rack 35 moves downward, driving the main gear 51 to rotate, synchronously driving the central gear 52 to rotate, and thus driving the planetary gears 53 to rotate. When the three planetary gears 53 rotate, they can both form self-rotation and revolution around the axis of the gear ring 54. When they revolve, they drive the rotating disc 55 to rotate. Through the frictional mechanical energy consumption of the main gear 51 and the rack 35, the central gear 52 and each planetary gear 53, and the planetary gear 53 and the gear ring 54, the vertical movement of the mass block 10 is jointly inhibited.

[0063] Specifically, one side of the gear ring 54 can be set to be closed. At this time, the central gear 52 is rotationally arranged on the closed surface of the gear ring 54 through a shaft, and the central gear 52 is coaxially fixed with the main gear 51 through a connecting shaft rod; each planetary gear 53 is located between the central gear 52 and the ring teeth of the gear ring 54, and each planetary gear 53 is connected together through a linkage frame 531 and can be fixed on the opening side of the gear ring 54 through an annular retaining ring, thereby restricting each planetary gear 53 from disengaging from the opening side of the gear ring 54 (the annular retaining ring does not affect the rotation of the linkage frame 531).

[0064] In an alternative embodiment of the present embodiment, preferably, as Figure 1 , Figure 2 and Figure 6 shown, the rotating gear set further includes a rotating disc 55. The rotating disc 55 is rotationally arranged in the floating drum 70 around a first axis (the rotating disc 55 is connected to the annular stabilizing frame 40 through another fixing frame), and the first axis is coaxial with the axis of the gear ring 54; the rotating disc 55 is connected to a planetary gear through a connecting rod 551, and the planetary gear is rotationally arranged on the connecting rod 551; the connecting rod 551 is fixedly connected to both the rotating disc 55 and the linkage frame 531.

[0065] Among them, the relevant settings of the ballast water injection mechanism 60 are described as follows:

[0066] In an alternative embodiment of the present embodiment, preferably, as Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, it further includes a ballast water injection mechanism 60; the ballast water injection mechanism 60 includes a controller 61 (the controller 61 can be arranged in the upper cavity of one of the pontoons 70), a water pump 62 and a plurality of wave sensors 63; the water pump 62 is used to be fixed on the connecting frame 71 of the offshore wind turbine platform (on the platform of the connecting frame 71); one water inlet of the water pump 62 is communicated with seawater, and the other water inlet of the water pump 62 is provided with a plurality of branch pipes 621, the branch pipes 621 correspond to the pontoons 70 one by one, and the end of the branch pipe 621 is used to be communicated with the ballast water tank of the pontoon 70; the wave sensors 63 correspond to the pontoons 70 one by one, and the controller 61 is communicatively connected with the water pump 62 and each wave sensor 63; the water pump 62 can inject water into the ballast water tank of the pontoon 70 through the branch pipe 621 or pump out the water in the ballast water tank of the pontoon 70 through the branch pipe 621 (that is, the water pump 62 selects an existing pump structure that can rotate forward to realize the pumping function and can also rotate reversely to realize the water absorption function).

[0067] In an alternative embodiment of the present embodiment, preferably, as Figure 2 shown, the ballast water injection mechanism 60 further includes a plurality of water level sensors 64 communicatively connected with the controller 61; the water level sensors 64 correspond to the pontoons 70 one by one; a water level sensor 64 is respectively arranged in the ballast water tank of each pontoon 70. The water level sensor 64 can monitor the water level in the ballast water tank, such as setting a minimum water level limit to ensure the stability of the pontoon 70; when the water level is lower than the minimum water level, the controller 61 pumps seawater into the ballast water tank by controlling the water pump 62 to ensure that the pontoon 70 does not capsize.

[0068] Specifically, the pontoon 70 has an upper cavity and a lower cavity, and the upper cavity and the lower cavity are separated by a partition; the upper cavity is used to install a multi-stage vibration damping mechanism; the lower cavity forms the ballast water tank of the pontoon 70.

[0069] Specifically, to ensure the smoothness of water inlet into the ballast water tank; an inlet and outlet and an exhaust port are opened on the side wall of the pontoon 70; the end of the branch pipe 621 is connected to the inlet and outlet, and a first electric control valve is arranged at the exhaust port, and the electric control valve is communicatively connected with the controller 61; when water is being filled into the ballast water tank, the first electric control valve can be opened to allow the gas in the ballast water tank to be discharged from the exhaust port, making the water inlet smoother.

[0070] Specifically, to ensure the smoothness of water drainage from the ballast water tank; a first communication hole is opened on the partition, and a second communication hole can be opened on the top of the pontoon 70 (the top of the pontoon 70 is higher than the sea level); a second electric control valve is arranged on the first communication hole, and a third electric control valve is arranged on the second communication hole, and the controller 61 is communicatively connected with the second electric control valve and the third electric control valve. When the water pump 62 discharges the water in the ballast water tank, outside air enters the ballast water tank through the first communication hole and the second communication hole to ensure the smoothness of water drainage from the ballast water tank.

[0071] Specifically, the wave sensor 63 can be any existing sensor capable of monitoring the size of waves, such as a force sensor. When the waves are large, the impact force on the force sensor is large; when the waves are small, the impact force on the force sensor is small. When the waves are large, the controller 61 controls the water pump 62 to pump seawater into the ballast tank, thereby increasing the draft depth of each buoy 70 and lowering its center of gravity. When the waves are small, the controller 61 controls the water pump 62 to pump out the seawater in the ballast tank, reducing the draft depth of the buoy 70.

[0072] Specifically, the wave sensor 63 can be arranged on the outer side wall of the buoy 70 at one-third of the distance from the bottom and distributed in a circumferential array.

[0073] Specifically, to reduce the rusting of the device and extend its service life, anti-rust treatment can be carried out on each necessary component, such as applying anti-rust oil to the inner wall of the buoy 70 and other related components.

[0074] Embodiment 2

[0075] This embodiment provides a vibration reduction method for a floating offshore wind turbine platform, which adopts the multi-stage vibration reduction device of the floating offshore wind turbine platform as in Embodiment 1, including the following steps:

[0076] In the horizontal direction, the mass block 10 generates horizontal movement in the buoy 70. In the primary vibration reduction mechanism 20, each first elastic element 21 and each first damper 22 can generate horizontal damping force to dissipate the energy of the horizontal movement of the mass block 10. In the secondary vibration reduction mechanism 30, the horizontal movement of the mass block 10 drives the core column to synchronously generate horizontal movement. Each second elastic element of the annular damper 34 can generate horizontal damping force to dissipate the energy of the horizontal movement of the core column.

[0077] In the vertical direction, the mass block 10 generates vertical movement in the buoy 70. In the primary vibration reduction mechanism 20, each first elastic element 21 and each first damper 22 can generate vertical damping force to dissipate the energy of the vertical movement of the mass block 10. In the secondary vibration reduction mechanism 30, the vertical movement of the mass block 10 drives the core column to synchronously generate vertical movement. Each second elastic element of the annular damper 34 can generate vertical damping force to dissipate the energy of the vertical movement of the core column. In the tertiary vibration reduction mechanism 50, the vertical movement of the core column can drive the rack 35 to move vertically and drive the main gear 51 to rotate. The meshing of the main gear 51 and the rack 35 can generate vertical damping force, and the energy of the vertical movement of the rack 35 is dissipated through the rotation of each gear of the rotating gear set.

[0078] A multi-level collaborative energy dissipation mechanism formed by multiple vibration damping mechanisms realizes dynamic vibration suppression in the horizontal and vertical directions, providing core technical support for the long-term stable operation of floating wind turbines in harsh sea conditions.

[0079] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A multi-stage vibration damping device for a floating offshore wind turbine platform, characterized in that: It includes a multi-stage vibration damping mechanism, and the multi-stage vibration damping mechanism is used to be arranged inside the buoy; the multi-stage vibration damping mechanism corresponds to the buoy one by one; The multi-stage vibration damping mechanism includes a mass block and a first-stage vibration damping mechanism, a second-stage vibration damping mechanism and a third-stage vibration damping mechanism arranged in sequence from top to bottom; The mass block is used to be arranged inside the buoy; The first-stage vibration damping mechanism includes a plurality of first elastic elements and a plurality of first dampers; the first elastic elements can elastically deform, one end of the first elastic elements is used to be fixedly connected to the inner wall of the buoy, and the other end of the first elastic elements can be fixedly connected to the mass block; one end of the first damper has a telescopic piston rod, the free end of the piston rod forms one end of the first damper, one end of the first damper can be rotatably connected to the mass block with a point as the rotation center, and the other end of the first damper is used to be rotatably connected to the inner wall of the buoy with a point as the rotation center; The second-stage vibration damping mechanism includes a housing, a core column and at least one annular vibration damper; the housing is used to be arranged inside the buoy and is connected to the inner wall of the buoy through a connecting piece; the housing has a through hole penetrating up and down, the core column is arranged in the through hole, and the upper end of the core column is fixedly connected to the mass block; the annular vibration damper includes a plurality of second elastic elements, one end of each second elastic element is fixedly connected to the inner side wall of the through hole, and the other end of each second elastic element is fixedly connected to the outer side wall of the core column; each annular vibration damper is distributed up and down along the axis of the through hole; The third-stage vibration damping mechanism includes a rotating gear set, the rotating gear set is arranged inside the buoy, and the rotating gear set has a driving gear that can rotate; a rack is fixedly arranged at the lower end of the core column, and the driving gear meshes with the rack.

2. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 1, characterized in that: It also includes a ballast water injection mechanism; The ballast water injection mechanism includes a controller, a water pump and a plurality of wave sensors; the water pump is used to be fixed on the connecting frame of the offshore wind turbine platform; one water inlet of the water pump is communicated with seawater, the other water inlet of the water pump is provided with a plurality of branch pipes, the branch pipes correspond to the buoys one by one, and the end of the branch pipe is used to be communicated with the ballast water tank of the buoy; the wave sensors correspond to the buoys one by one, and the controller is communicatively connected to the water pump and each wave sensor; The water pump can inject water into the ballast water tank of the buoy through the branch pipe or pump out the water in the ballast water tank of the buoy through the branch pipe.

3. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 1, characterized in that: The first-stage vibration damping mechanism includes an annular bracket, a plurality of the first elastic elements and a plurality of the first dampers; The center of gravity of the mass block is located on the axis of the buoy; and the mass block is fixedly connected to the annular bracket; The first elastic elements are in an inclined posture. In the axial direction of the buoy, the upper end of the first elastic elements is used to be fixedly connected to the inner wall of the buoy, and the lower end of the first elastic elements is fixedly connected to the annular bracket; each first elastic element is circumferentially distributed around the axis of the buoy; When the mass block is in a static state, the axis of the first damper is in a horizontal state, and universal ball heads for point rotation centers are provided at both ends of the first damper for connection with the inner side wall of the floating drum and the annular bracket.

4. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 3, characterized in that: Each of the first elastic elements and each of the first dampers are circumferentially and uniformly distributed around the axis of the floating drum; and one of the first dampers is provided between two adjacent first elastic elements.

5. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 1, characterized in that: The core column includes an upper core rod, a longitudinal shock absorber and a lower core rod connected in sequence from top to bottom; The upper end of the upper core rod is fixedly connected to the mass block, and each of the annular shock absorbers is arranged between the outer side wall of the upper core rod and the inner side wall of the through hole; The longitudinal shock absorber includes an upper connecting plate, a lower connecting plate and a plurality of longitudinal restoring elastic elements; the upper connecting plate is fixedly connected to the lower end of the upper core rod; each of the longitudinal restoring elastic elements is arranged between the upper connecting plate and the lower connecting plate, the longitudinal restoring elastic element can elastically deform, the upper end of the longitudinal restoring elastic element is fixedly connected to the upper connecting plate, and the lower end of the longitudinal restoring elastic element is fixedly connected to the lower connecting plate; a limiting annular surface is arranged in the through hole, and the limiting annular surface can limit the lower connecting plate from moving to the side of the limiting annular surface away from the upper core rod; The upper end of the lower core rod is fixedly connected to the lower connecting plate, and a rack is arranged at the lower end of the lower core rod.

6. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 1, characterized in that: An annular stabilizing frame is fixedly arranged in the through hole; The connecting member includes a plurality of second dampers; each of the second dampers is circumferentially distributed around the axis of the outer shell; the second dampers are in an inclined posture, and in the axial direction of the floating drum, the upper end of the second damper is rotatably connected to the outer side wall of the outer shell with a point as the rotation center, and the lower end of the second damper is rotatably connected to the annular stabilizing frame with a point as the rotation center.

7. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 1, characterized in that: The rotating gear set includes a toothed ring, a central gear, the main gear and a plurality of planetary gears; The toothed ring can be fixedly connected to the inner wall of the floating drum through a fixing frame; The central gear is coaxial with the toothed ring, and the central gear can rotate relative to the toothed ring around the axis of the toothed ring; The main gear is coaxially fixed to the central gear; Each of the planetary gears is circumferentially distributed around the axis of the central gear between the outer side wall of the central gear and the inner side wall of the toothed ring, and the planetary gears are meshed with both the central gear and the toothed ring, and each of the planetary gears is rotatably connected to a linkage frame.

8. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 7, characterized in that: The rotating gear set further includes a rotating disk, the rotating disk is rotatably arranged in the floating drum around a first axis, and the first axis is coaxial with the axis of the toothed ring; The rotating disk is connected to one of the planetary gears through a connecting rod, and the planetary gear is rotatably arranged on the connecting rod; the connecting rod is fixedly connected to both the rotating disk and the linkage frame.

9. The multi-stage vibration damping device of the floating offshore wind turbine platform according to claim 2, characterized in that: The ballast water injection mechanism further includes a plurality of water level sensors communicatively connected to the controller; The water level sensors correspond to the floating drums one by one; one of the water level sensors is respectively arranged in the ballast water tank of each floating drum.

10. A vibration damping method for a floating offshore wind turbine platform, characterized in that: Adopt the multi-stage vibration damping device of the floating offshore wind turbine platform according to any one of claims 1 to 9, comprising the following steps: In the horizontal direction, the mass block generates horizontal movement in the floating cylinder. In the primary vibration damping mechanism, each of the first elastic elements and each of the first dampers can generate a damping force in the horizontal direction to dissipate the energy of the horizontal movement of the mass block; In the secondary vibration damping mechanism, the horizontal movement of the mass block drives the core column to synchronously generate horizontal movement. Each of the second elastic elements of the annular vibration damper can generate a damping force in the horizontal direction to dissipate the energy of the horizontal movement of the core column; In the vertical direction, the mass block generates vertical movement in the floating cylinder. In the primary vibration damping mechanism, each of the first elastic elements and each of the first dampers can generate a damping force in the vertical direction to dissipate the energy of the vertical movement of the mass block; in the secondary vibration damping mechanism, the vertical movement of the mass block drives the core column to synchronously generate vertical movement. Each of the second elastic elements of the annular vibration damper can generate a damping force in the vertical direction to dissipate the energy of the vertical movement of the core column; in the tertiary vibration damping mechanism, the vertical movement of the core column can drive the rack to move vertically and drive the main gear to rotate. The meshing of the main gear and the rack can generate a damping force in the vertical direction, and the energy of the vertical movement of the rack is dissipated through the rotation of each gear of the rotating gear set.

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