A wind wave combined power generation device and test device and method
By designing a wind-wave combined power generation device, a multi-field coupling simulation of wind, waves, and mooring was achieved, solving the problem that existing test devices cannot take into account the coupling effect of wind turbines, wave energy devices, and mooring systems. This improved the accuracy and adaptability of test data and optimized the structural stability and durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUN YAT SEN UNIV
- Filing Date
- 2026-05-06
- Publication Date
- 2026-07-28
AI Technical Summary
Existing model tests of marine energy power generation devices cannot take into account the coupling effect of wind turbines, wave energy devices, and mooring systems, resulting in significant differences between test data and actual marine environments. This makes it impossible to provide reliable test data support and hinders the process of structural optimization and engineering.
Design a wind and wave combined power generation device, including a semi-submersible platform, a dual-rotor wind turbine, a wave energy capture mechanism and an energy harvesting system, and integrate a multi-dimensional data acquisition system to realize multi-field coupling simulation of wind, waves and mooring. The device is fixed in the test pool by the mooring system to accurately obtain structural stress and energy conversion parameters.
It achieves accurate simulation of wind and wave combined power generation devices, significantly improves the test accuracy and reliability of test data, adapts to test scenarios of different power levels and sizes, optimizes structural stability and durability, and meets the needs of long-term repeated testing.
Smart Images
Figure CN122467327A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of marine renewable energy equipment testing technology, and particularly relates to a wind and wave combined power generation device, testing device and method. Background Technology
[0002] As offshore energy development extends into deep waters, wind and wave combined power generation devices have become a research hotspot in the field of marine energy equipment due to their ability to simultaneously capture wind and wave energy and improve overall energy utilization efficiency. Their model testing devices are core tools for verifying the rationality of equipment design, optimizing structural parameters, and reducing engineering risks. Currently, model tests of marine energy power generation devices mostly focus on single energy forms (wind or wave energy) or on traditional single-rotor, fixed mooring structures, and related technologies have achieved initial application.
[0003] However, existing devices cannot simultaneously account for the coupling effects of wind turbines, wave energy devices, and mooring systems, and their operating conditions differ significantly from those in actual marine environments, leading to substantial discrepancies between experimental data and prototype devices. These shortcomings prevent existing experimental devices from providing reliable experimental data support for single-point moored dual-rotor wind-wave combined power generation devices, thus hindering the structural optimization and engineering progress of such equipment.
[0004] Therefore, it is necessary to design a wind and wave combined power generation device, experimental apparatus, and method to solve the above problems. Summary of the Invention
[0005] The purpose of this invention is to provide a wind-wave combined power generation device, test apparatus, and method to achieve multi-field coupling simulation of wind, waves, and mooring, accurately obtain structural stress, motion performance, and energy conversion parameters similar to the prototype device, and provide a reliable test platform for the design optimization and performance verification of such devices.
[0006] To achieve the above objectives, the present invention provides the following solution: a wind and wave combined power generation device, comprising: The semi-submersible platform is secured in the test pool by a mooring system. A dual-rotor fan mechanism is fixedly mounted on the top of the semi-submersible platform mechanism; A wave energy capture mechanism is installed on the semi-submersible platform mechanism, and the wave energy capture mechanism is used to absorb wave energy in the pool. An energy harvesting system is connected to the wave energy capture mechanism, and the energy harvesting system is used to receive and store the wave energy absorbed by the wave energy capture mechanism. A data acquisition system is installed on the semi-submersible platform mechanism, the dual-rotor wind turbine mechanism, the wave energy capture mechanism, and the energy harvesting system, and the data acquisition system is connected to a data acquisition terminal.
[0007] A wind-wave combined power generation device based on the present invention. The semi-submersible platform mechanism includes three semi-submersible floating bodies, which are arranged in a "pin" shape. Lower crossbeams, middle crossbeams, and upper crossbeams are fixedly connected between two adjacent semi-submersible floating bodies. The lower crossbeams, middle crossbeams, and upper crossbeams are arranged at intervals from bottom to top. The dual-rotor fan mechanism is fixedly connected to the tops of two adjacent semi-submersible floating bodies. A connection mechanism is fixedly connected to the top of the outer side wall of the third semi-submersible floating body. The mooring system is fixedly connected to the connection mechanism. The bottom end of the wave energy float is fixedly connected with a heaving plate, and the lower crossbeam is fixedly connected between the two heaving plates.
[0008] A wind-wave combined power generation device based on the present invention. The connection mechanism includes an upper support ring and a lower support ring. The upper support ring and the lower support ring are fixedly sleeved on the top of the outer side wall of the semi-submersible floating body. The upper support ring and the lower support ring are arranged at intervals up and down. The outer side wall of the upper support ring is fixedly connected with a steel arm, which is horizontally arranged. One end of an inclined first support arm is fixedly connected to the top of the steel arm, and the other end of the first support arm is fixedly connected to the top end of the semi-submersible floating body. One end of an inclined second support arm is fixedly connected to the bottom of the steel arm, and the other end of the second support arm is fixedly connected to the outer side wall of the lower support ring. One end of the steel arm far away from the upper support ring is rotatably connected with a single point mooring disc through a bearing. A plurality of fairlead holes are opened on the single point mooring disc, and the mooring system is fixedly connected to the single point mooring disc through the fairlead holes.
[0009] A wind-wave combined power generation device based on the present invention. The mooring system includes a plurality of mooring chains, which correspond to the fairlead holes one by one. One end of the mooring chain is fixedly connected in the fairlead hole, and the other end of the mooring chain is fixedly connected to the bottom wall of the water pool.
[0010] A wind-wave combined power generation device based on the present invention. The dual-rotor fan mechanism includes two tower barrels. The bottom end of the tower barrel is fixedly connected to the top end of the semi-submersible floating body. The tops of the two tower barrels are far away from each other and a stay cable is fixedly connected between them. A stay cable is fixedly connected between the top end of the tower barrel and the top end of the semi-submersible floating body provided with the connection mechanism. A fan is arranged at the top end of the tower barrel. A first support rib plate is arranged between the bottom end of the tower barrel and the top end of the semi-submersible floating body, and a second support rib plate is arranged between the top end of the tower barrel and the fan.
[0011] According to the present invention, a wind and wave combined power generation device includes a wave energy capture mechanism comprising multiple wave energy floats, which are evenly arranged along the length of the central crossbeam. A third support arm is fixedly connected to the bottom end of each wave energy float, and a second rotating joint is rotatably connected to the other end of the third support arm. The second rotating joint is fixedly connected to the central crossbeam, and the energy harvesting system is fixedly connected to the top end of each wave energy float.
[0012] According to the present invention, a wind and wave combined power generation device includes an energy harvesting system comprising multiple energy harvesting hydraulic rods, each corresponding to a wave energy float. A first rotating joint is rotatably connected to the bottom end of each energy harvesting hydraulic rod, and the first rotating joint is fixedly connected to the top end of each wave energy float. A third rotating joint is rotatably connected to the top end of each energy harvesting hydraulic rod. Multiple third rotating joints are jointly fixedly connected to a transverse support beam. The transverse support beam is fixedly connected to the top end of an upper crossbeam via multiple vertical support beams. The rodless cavity of each energy harvesting hydraulic rod is connected to a hydraulic cylinder via a pipeline.
[0013] According to the present invention, a wind and wave combined power generation device is provided with stroke adjustment components between the bottom end of the energy harvesting hydraulic rod and the first rotary joint, and between the top end of the energy harvesting hydraulic rod and the third rotary joint.
[0014] A test apparatus for a wind-wave combined power generation device, used for testing the wind-wave combined power generation device.
[0015] A test method for a wind-wave combined power generation device, based on a test apparatus for the wind-wave combined power generation device, includes the following steps: Complete the assembly of the semi-submersible platform mechanism and adjust it to the target draft using counterweights; Install a dual-rotor wind turbine mechanism, precisely adjust the blade pitch angle, and connect and integrate the float of the wave energy capture mechanism with the hydraulic cylinder and pipeline of the energy harvesting system. Deploy the mooring system, arrange the mooring chains as required, and adjust the pretension; Various sensors of the data acquisition system are installed in key parts such as the semi-submersible platform structure, the dual-rotor fan structure, the mooring chain and the energy harvesting system, and the cables are connected to the data acquisition terminal.
[0016] Compared with the prior art, the present invention has the following advantages and technical effects: 1. Achieve multi-field coupled simulation of wind, waves and mooring, filling experimental gaps: Through the collaborative design of the dual-rotor wind turbine mechanism, wave energy capture mechanism and energy harvesting system, mooring system and semi-submersible platform mechanism, the limitations of independent simulation of each system in existing devices are broken, and the coupling mechanism of wind, waves and mooring constraints in the marine environment can be accurately reproduced.
[0017] 2. Significantly improves testing accuracy and greatly enhances data reliability: The device integrates a multi-dimensional high-precision data acquisition system, which can simultaneously collect key parameters such as wind turbine torque, mooring pull, and platform attitude.
[0018] 3. Improved adaptability and versatility, expanding test scenarios: Through modular design, the wave energy capture mechanism, energy harvesting system and mooring system can be finely adjusted according to test requirements, and are compatible with test scenarios of wind turbines of different power levels, floats of different sizes and mooring schemes, without the need for overall reconstruction of the device.
[0019] 4. Structural stability and durability optimization: Under simulated wind speeds of 1-12 m / s and wave heights of 0.2-1.5 m, the device operates continuously for a long time without structural deformation, meeting the requirements for long-term repeated testing. Attached Figure Description
[0020] 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.
[0021] Figure 1 This is an isometric view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is a schematic diagram of the energy harvesting system of the present invention; Figure 6 This is a schematic diagram of the mooring system of the present invention; Figure 7 This is a top view of the mooring system of the present invention; Figure 8 This is a schematic diagram of the arrangement of the present invention within the water tank; Figure 9 Comparison of platform motion under different wave cycles in extreme working conditions; Figure 10 For the platform motion acceleration under extreme working conditions of wind and regular waves; Figure 11 For platform mooring force under extreme working conditions of wind and regular waves.
[0022] Among them, 1. lower crossbeam; 2. semi-submersible floating body; 3. middle crossbeam; 4. wave energy float; 5. energy harvesting hydraulic rod; 6. first support rib plate; 7. tower barrel; 8. fan; 9. stay cable; 10. second support rib plate; 11. transverse support beam; 12. support beam connection seat; 13. first support arm; 14. steel arm; 15. bearing; 16. single point mooring disk; 17. fairlead; 18. second support arm; 19. upper support ring; 20. lower support ring; 21. stroke adjuster; 22. first rotary joint; 23. third support arm; 24. second rotary joint; 25. third rotary joint; 26. reinforcing gusset plate; 27. vertical support beam; 28. upper crossbeam; 29. heaving plate. Specific embodiments
[0023] 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.
[0024] 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 embodiments.
[0025] Refer to Figures 1 to 11 As shown, the present invention provides a combined wind and wave power generation device, including: A semi-submersible platform mechanism, which is fixed in the test pool through a mooring system; A dual-rotor fan mechanism, which is fixedly arranged on the top of the semi-submersible platform mechanism; A wave energy capture mechanism, which is arranged on the semi-submersible platform mechanism and is used to absorb the wave energy in the pool; An energy intake system, which is传动连接 with the wave energy capture mechanism and is used to receive the wave energy absorbed by the wave energy capture mechanism and store it; A data acquisition system, which is arranged on the semi-submersible platform mechanism, the dual-rotor fan mechanism, the wave energy capture mechanism, and the energy intake system, and the data acquisition system is connected to a data acquisition terminal.
[0026] Further, the semi-submersible platform mechanism includes three semi-submersible floating bodies 2, which are arranged in a "pin" shape. A lower crossbeam 1, a middle crossbeam 3, and an upper crossbeam 28 are fixedly connected between two adjacent semi-submersible floating bodies 2. The lower crossbeam 1, the middle crossbeam 3, and the upper crossbeam 28 are arranged at intervals from bottom to top in sequence. The dual-rotor fan mechanism is fixedly connected to the tops of two adjacent semi-submersible floating bodies 2. A connecting mechanism is fixedly connected to the top of the outer side wall of the third semi-submersible floating body 2, and the mooring system is fixedly connected to the connecting mechanism.
[0027] Furthermore, the connecting mechanism includes an upper support ring 19 and a lower support ring 20. The upper support ring 19 and the lower support ring 20 are fixedly sleeved on the top of the outer wall of the semi-submersible body 2. The upper support ring 19 and the lower support ring 20 are arranged vertically at intervals. A steel arm 14 is fixedly connected to the outer wall of the upper support ring 19. The steel arm 14 is horizontally arranged. One end of a first support arm 13 is fixedly connected to the top of the steel arm 14 at an incline. The other end of the first support arm 13 is fixedly connected to the top of the semi-submersible body 2. One end of a second support arm 18 is fixedly connected to the bottom of the steel arm 14 at an incline. The other end of the second support arm 18 is fixedly connected to the outer wall of the lower support ring 20. A single-point mooring disk 16 is rotatably connected to the end of the steel arm 14 away from the upper support ring 19 through a bearing 15. The single-point mooring disk 16 has multiple cable guide holes 17. The mooring system is fixedly connected to the single-point mooring disk 16 through the cable guide holes 17.
[0028] Furthermore, the mooring system includes multiple mooring chains, each corresponding to a guide hole 17. One end of the mooring chain is fixedly connected to the guide hole 17, and the other end of the mooring chain is fixedly connected to the bottom wall of the pool.
[0029] The experimental setup employed a catenary single-point mooring system. Limited by the actual water depth of 4.5m in the pool (corresponding to a prototype depth of 162m), the anchor chain parameters and arrangement radius were specifically optimized. The mooring system consisted of three mooring chains radially distributed at 120° intervals. Each mooring chain component included a wire rope, counterweights, a simulated spring, shackles, and a universal joint. Since the linear density of the main wire rope of the model mooring chain could not directly meet the weight similarity requirements, weights were added at equal intervals to the wire rope for mass compensation. Simultaneously, to simulate the axial stiffness characteristics of the prototype anchor chain, a galvanized spring with matching stiffness characteristics was connected in series in the middle section of the mooring chain, and tension / compression sensors were installed at this point to monitor tension changes. Furthermore, to eliminate the interference of mooring line torsion on tension measurement, a universal joint structure was used at the connection between the mooring line and the platform.
[0030] Furthermore, the dual-rotor fan mechanism includes two towers 7, the bottom of which is fixedly connected to the top of the semi-submersible body 2. The tops of the two towers 7 are far apart from each other and are fixedly connected by a cable 9. The top of the tower 7 is fixedly connected to the top of the semi-submersible body 2, which is equipped with a connecting mechanism, by a cable 9. A fan 8 is installed at the top of the tower 7.
[0031] The wind turbine's eight blades are made of carbon fiber composite material and feature an internal hollow lightweight design. The blade's aerodynamic shape is precisely divided into 18 sections along its span, with a circular transition at the blade root to accommodate connection requirements. The remaining sections are designed based on the 1.8MW blade airfoil, and smooth connections between airfoils are achieved using a smooth surface algorithm. In terms of manufacturing, a precision mold was first designed based on the optimized aerodynamic shape, followed by carbon fiber layup, heat curing, demolding, and polishing. Finally, a single-piece molding process was used to complete the process. The prototype blade is 47.52m long and weighs 6625.152kg. The manufactured model blade is 1.23m long, with a measured weight controlled at 142g, perfectly matching the theoretical design value with 0% error. This not only ensures the model meets geometric and weight similarity requirements but also effectively guarantees the accuracy of the moment of inertia, thus meeting the critical experimental requirements for gyroscopic torque similarity.
[0032] Tower 7 has a total length of 1.552m and an effective vertical height of 1.37625m. To meet the stiffness similarity criteria in aeroelastic coupling tests, tower 7 is made of AL2024 aluminum alloy tubing. This material possesses low density, high strength, and suitable elastic modulus characteristics, enabling it to effectively simulate the structural response of the prototype. In terms of structural design, to facilitate precision machining, the inner diameter of tower 7 is set to a constant 12mm, while stiffness simulation is achieved by varying the outer diameter. Specifically, the prototype tower is divided into 10 segments along its height. Based on the scaling relationship of the section modulus of each segment, the corresponding model outer diameter is calculated. CNC machining technology is used to perform segmented variable cross-section machining on the outer surface of the aluminum alloy tubing. This effectively ensures the consistency of tower 7 with the prototype in distributed stiffness characteristics, thereby accurately reflecting the elastic deformation characteristics of the tower under wind and wave loads.
[0033] As a large-mass component located at the top of Tower 7, the nacelle's inertial characteristics significantly influence the load distribution of Tower 7 and the overall motion response of the machine. Therefore, the nacelle model design not only needs to adhere to weight similarity principles but also ensures that its mass distribution is highly consistent with the prototype. The nacelle integrates the main shaft, couplings, bearings, drive motors, and various sensors. To achieve lightweight control, the nacelle shell is precision-machined and welded from AL2024 aluminum alloy sheet, featuring a hollow design. This alloy shell possesses excellent rigidity and strength, accurately transmitting the wind turbine thrust to the six-dimensional force sensor at the top of the tower. In the drivetrain arrangement, the front end of the nacelle main shaft connects to the wind turbine hub, and the rear end connects to the torque sensor and control motor sequentially via couplings, ensuring concentricity of all components. The main shaft axis is tilted at 0° to the horizontal plane, maintaining consistency with the prototype's geometry. Through optimized layout and precision machining of internal components such as sensors, couplings, and motors, geometric similarity between the model nacelle's center of gravity and the prototype was successfully achieved.
[0034] The propeller hub assembly consists of a main structure, three blade connecting supports, a pitch collar, and structural connecting bolts. To control quality, all components are precision-machined from aluminum alloy using CNC machining. The pitch mechanism is designed for manual adjustment; the pitch collar is bolted to the blade connecting seats and features a 360° graduated dial manufactured using electro-injection technology. This dial allows for rotation around the aerodynamic axis of the blades to adjust the pitch angle with an accuracy of 0.2°, meeting the precise control requirements of the experiment under various operating conditions.
[0035] Furthermore, the wave energy capture mechanism includes multiple wave energy floats 4, which are evenly arranged along the length of the central crossbeam 3. One end of a third support arm 23 is fixedly connected to the bottom of the wave energy float 4, and the other end of the third support arm 23 is rotatably connected to a second rotating joint 24. The second rotating joint 24 is fixedly connected to the central crossbeam 3, and the energy harvesting system is fixedly connected to the top of the wave energy float 4.
[0036] The wave energy float 4 is fabricated using high-density resin material through 3D printing. To ensure the structural strength and rigidity of the model under wave impact loads, an aluminum alloy skeleton is embedded inside the wave energy float 4 for reinforcement. The top of the wave energy float 4 is designed with a dedicated connecting lug structure, which is rigidly connected to the energy harvesting system through a high-strength bolt assembly, thereby ensuring that the motion of the wave energy float 4 can be effectively transmitted to the energy harvesting system.
[0037] Furthermore, the energy harvesting system includes multiple energy harvesting hydraulic rods 5, each corresponding to a wave energy float 4. The bottom end of the energy harvesting hydraulic rod 5 is rotatably connected to a first rotary joint 22, which is fixedly connected to the top end of the wave energy float 4. The top end of the energy harvesting hydraulic rod 5 is rotatably connected to a third rotary joint 25, and multiple third rotary joints 25 are jointly fixedly connected to a transverse support beam 11. The transverse support beam 11 is fixedly connected to the top end of an upper crossbeam 28 via multiple vertical support beams 27. The rodless cavity of the energy harvesting hydraulic rod 5 is connected to a hydraulic cylinder via a pipeline.
[0038] A support beam connecting seat 12 is provided between the bottom end of the vertical support beam 27 and the top end of the upper crossbeam 28. A reinforcing elbow plate 26 is provided between the top end of the vertical support beam 27 and the bottom end of the transverse support beam 11.
[0039] Furthermore, stroke adjustment components 21 are provided between the bottom end of the energizing hydraulic rod 5 and the first rotary joint 22, and between the top end of the energizing hydraulic rod 5 and the third rotary joint 25.
[0040] The energy harvesting system includes multiple sets of energy-harvesting hydraulic rods hinged to the wave energy capture model, and a hydraulic energy storage unit connected to the pipelines of the energy-harvesting hydraulic rods. The energy harvesting system is designed based on the principle of hydraulic pumping energy storage. The system mainly consists of energy-harvesting hydraulic rods 5, hydraulic energy storage cylinders, and a fluid transmission pipeline network. The energy-harvesting hydraulic rods 5 are precision cylinders with a stroke of 200mm and a cylinder diameter of 20mm, installed between the wave energy float 4 and the floating platform to capture the heave motion energy of the wave energy float 4. The hydraulic energy storage cylinder consists of three sets of large-capacity cylinders with a stroke of 500mm and a cylinder diameter of 100mm, arranged on the trailer platform to store the converted hydraulic energy in water. Flexible PVC hoses are used to connect the various components to accommodate the multi-degree-of-freedom movement of the model in water.
[0041] In the hydraulic circuit design, four energizing hydraulic rods 5 are grouped together. The pipeline of each energizing hydraulic rod 5 is connected to the inlet and outlet branches via a tee connector, and a check valve is installed in the pipeline to control the fluid flow and prevent backflow. The inlet is positioned below the water surface in the pool, while the outlet is connected to the collection unit. The collection unit uses a five-way valve to combine the four outputs into a single pipeline, which ultimately connects to the hydraulic accumulator. Under wave excitation, the wave energy float 4 generates oscillating motion, driving the energizing hydraulic rods 5 to reciprocate: during the extension stroke (water intake process), a negative pressure is formed in the cavity of the energizing hydraulic rod 5, drawing fluid from the pool through the inlet check valve; during the compression stroke (drainage process), the high-pressure fluid is forced into the accumulator through the outlet check valve and the collection pipeline. As the fluid volume accumulates in the accumulator, it gradually lifts the load counterweight on the upper part of the cylinder. This process achieves a two-stage energy conversion: first, wave energy is converted into the relative motion kinetic energy of wave energy float 4 and platform, then into fluid pressure energy, and finally stored in the form of gravitational potential energy of counterweight.
[0042] After each set of operating condition tests, the fluid in the accumulator cylinder needs to be drained to reset the system and prepare for the next test. In addition, given that the complex hydraulic pipeline system has a certain mass and stiffness, which may cause parasitic interference to the motion response of the floating device, a special bracket suspension with flexible spring connection was used in the experiment to fix the pipeline system to the trailer platform, so as to minimize the impact of the pipeline on the dynamic characteristics of the model.
[0043] Furthermore, the bottom of the wave energy float 4 is fixedly connected to a heave plate 29, and the lower crossbeam 1 is fixedly connected between the two heave plates 29.
[0044] The semi-submersible platform mechanism was designed and manufactured using digital processes to ensure that the model meets the requirements of weight similarity and rotational inertia similarity, while also satisfying basic geometric similarity criteria. The main structure of the model was first constructed using fiberglass sheets to build the inner framework of the semi-submersible floats 2 and the heave plate 29, followed by a fiberglass coating and curing process to enhance the structural strength and watertightness of the platform. The top of the platform uses box-shaped beams made of aluminum alloy to connect the three semi-submersible floats 2. This design not only ensures the overall structural rigidity of the platform but also provides a convenient interface for the installation and mounting of the wave energy floats 4.
[0045] Furthermore, a first support rib 6 is provided between the bottom end of the tower 7 and the top end of the semi-submersible hull 2, and a second support rib 10 is provided between the top end of the tower 7 and the fan 8.
[0046] For the measurement of key performance parameters of the wind turbine, various sensor arrangement schemes were employed in the experiment. The experiment characterized the rotor thrust by collecting data on the horizontal forces acting on the overall nacelle structure. Given that the wind load on the nacelle itself is a small, high-order quantity relative to the rotor thrust, this measurement data can accurately reflect the main dynamic characteristics of the rotor's axial thrust under complex environmental loads. A six-dimensional force sensor is rigidly connected between the tower and the nacelle via a flange to measure the thrust and bending moment transmitted to the top of the tower; a torque sensor is connected in series between the main shaft and the motor via an aluminum alloy coupling to monitor aerodynamic torque in real time; and an acceleration sensor is bonded and fixed directly below the center of gravity of the nacelle to capture the dynamic response of the nacelle. At the tower base, to accurately obtain the bending moment at the tower bottom, the upper surface of the six-dimensional force sensor is bolted to the bottom flange of the tower, and the lower surface is fixed to the floating platform via an adapter flange. Structural reinforcing ribs are provided at the connection to eliminate measurement errors caused by flange loosening, and optical motion capture markers are also arranged at the bottom of the tower. In addition, taking into account the structural characteristics of the dual-rotor wind turbine, three inclined cables connect the two wind turbines and the wind turbine and the front tower respectively, and the pretension is adjusted by tensioners. Tension and compression sensors are connected in series on the cables to monitor the tension changes in real time.
[0047] Considering that the mass and stiffness of the cables leading from numerous sensors might interfere with the model's dynamic characteristics, a cable management scheme was adopted in the experiment. The cable bundles were bound and fixed along the surface of the tower, ensuring neatness while allowing sufficient flexibility to avoid restricting the tower's elastic deformation. Finally, the cables were flexibly connected to the trailer's data acquisition terminal at the base of the tower via brackets, lifting rings, and a spring suspension system. This minimized the additional damping and stiffness impact of the cables on the model system's motion, ensuring the authenticity and reliability of the experimental data.
[0048] After developing the models of each subsystem, the overall device was assembled and debugged. First, the modules were assembled into a whole, and the device was weighed using a crane scale. After deducting the additional mass of the slings and other components, the total amount of ballast lead blocks required was determined based on the theoretical total weight of the scaled-down model. Then, referring to the mass distribution data calculated using CATIA 3D modeling, the ballast lead blocks were precisely distributed into the three main pontoons. After completing the cable support arrangement, the draft of the three pontoons was finely adjusted by adjusting the reserved ballast at the top of the platform until the surface fluctuations stabilized within ±1mm of the draft line when the pontoons were subjected to minor disturbances in still water, marking the completion of draft adjustment.
[0049] In the final test setup, the platform floated in the test waters between the trailer and the aeration system, positioned using three mooring lines. One end of each mooring line was connected to the cable guide hole of a single-point mooring disc, while the other end was connected to a weight sunk to the bottom of the pool for fixation. To ensure the reliability and safety of data acquisition, all sensor cables were bundled and organized on the platform before being suspended along the anchor chain connecting to the trailer and led to the trailer's control console, where they were connected to the data acquisition system and power supply. During the cabling process, special attention was paid to leading the cables out from the balanced position, with an appropriate length allowance. This was to avoid the cables being taut and creating additional constraints on the platform's movement, and to prevent excessively long cables from dangling into the water and causing safety hazards, thus ensuring that the test could be conducted safely and without interference.
[0050] The data acquisition system is used to simultaneously acquire the motion attitude of the semi-submersible platform model, the aerodynamic thrust of the dual-rotor wind turbine model, the tower torque, the tower top torque, the wind turbine speed, the wind turbine torque, the nacelle acceleration, the energy conversion parameters of the energy harvesting system, and the mooring tension of the mooring system model.
[0051] Experimental example: This embodiment, based on a 1:36 scale, constructs a model test device and conducts experiments on a 1.8MW dual-rotor wind-wave combined power generation prototype device. The specific process is as follows: 1. Device assembly and commissioning (1) Semi-submersible platform assembly: Fiberglass boards are used to build the main pontoon and the inner frame of the heave plate. Fiberglass is coated and cured. Aluminum alloy box beams are welded. Ballast lead blocks are arranged in the pontoon according to CATIA three-dimensional modeling data. The pontoon is finely adjusted to the target draft to ensure that the surface fluctuation is stable within ±1mm of the draft line after disturbance in still water.
[0052] (2) Installation of dual rotor wind turbine: The carbon fiber blades are laid up in a mold, heated and cured, and molded together. They are then assembled with the aluminum alloy blade hub and the blade pitch angle is adjusted to the initial position (accuracy 0.2°). The main shaft, coupling, torque sensor and control motor inside the nacelle are arranged concentrically. The aluminum alloy hollow shell is welded and connected to the tower through the six-dimensional force sensor at the top of the tower. The tower is CNC machined into a 10-segment variable cross-section structure. The bottom is fixed to the platform through the adapter flange and the six-dimensional force sensor. The cable is connected between the two wind turbines and to the front tower and tensioned.
[0053] (3) Energy harvesting system and float installation: 12 resin floats are embedded in aluminum alloy frames and 3D printed. They are connected to hydraulic working cylinders by bolts. Every 4 working cylinders form a group and are connected to the five-way collection unit through a three-way valve and a one-way valve. They are then connected to the energy storage cylinders (3 groups) with flexible PVC pipes. The pipelines are suspended on the trailer platform by brackets, rings and springs.
[0054] (4) Mooring system deployment: Three mooring chains are arranged radially at 120°. Weights are added at equal intervals on the steel wire ropes to compensate for the mass. A galvanized spring and a tension / compression sensor are connected in series in the middle section. One end is connected to the platform mooring plate via a universal joint, and the other end is fixed to the bottom of the pool with a counterweight. The pretension is adjusted to the design value.
[0055] (5) Data acquisition system layout: Six-dimensional force sensors are installed at the top and base of the tower, torque sensors are connected in series on the main shaft, acceleration sensors are bonded below the center of gravity of the nacelle, tension and compression sensors are connected in series on the stay cables and mooring chains, and optical motion capture markers are arranged at the bottom of the tower; cables are tied and fixed along the tower tube and flexibly connected to the trailer data acquisition terminal through the tower bottom spring suspension system.
[0056] 2. Experimental process and data comparison Test conditions: wind speed 4.64 m / s, wave height 0.15 m, wave period 1.6 s, 2.2 s, 3.0 s.
[0057] Experimental process: The wind generator and wave generator were started to simulate the sea wind and wave environment. The main shaft torque, nacelle acceleration, wind turbine thrust, tower root bending moment, stay cable and mooring chain tension, energy storage cylinder line displacement and other parameters were recorded synchronously through the data acquisition system.
[0058] 3. Device optimization and adaptability By adjusting the pitch angle (0.2° precision step), mooring chain pretension, and PTO system hydraulic pipeline pressure, it can adapt to different operating conditions such as wind speed of 1-12m / s and wave height of 0.5-1.5m, meeting the multi-condition performance verification requirements of single-point moored dual-rotor wind and wave combined power generation device.
[0059] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0060] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope of the present invention.
Claims
1. A wind and wave combined power generation device, characterized in that, Comprising: A semi-submersible platform mechanism, fixed in the test pool through a mooring system; A dual-rotor fan mechanism, fixedly arranged on the top of the semi-submersible platform mechanism; A wave energy capture mechanism, arranged on the semi-submersible platform mechanism, and the wave energy capture mechanism is used to absorb the wave energy in the pool; An energy intake system, drivingly connected to the wave energy capture mechanism, and the energy intake system is used to receive the wave energy absorbed by the wave energy capture mechanism and store it; A data acquisition system, arranged on the semi-submersible platform mechanism, the dual-rotor fan mechanism, the wave energy capture mechanism, and the energy intake system, and the data acquisition system is connected to a data acquisition terminal.
2. The wind and wave combined power generation device according to claim 1, characterized in that, The semi-submersible platform mechanism includes three semi-submersible floating bodies (2), and the three semi-submersible floating bodies (2) are arranged in a "pin" shape. A lower cross beam (1), a middle cross beam (3), and an upper cross beam (28) are fixedly connected between two adjacent semi-submersible floating bodies (2). The lower cross beam (1), the middle cross beam (3), and the upper cross beam (28) are arranged at intervals from bottom to top in sequence. The dual-rotor fan mechanism is fixedly connected to the tops of two adjacent semi-submersible floating bodies (2). A connecting mechanism is fixedly connected to the top of the outer side wall of the third semi-submersible floating body (2), and the mooring system is fixedly connected to the connecting mechanism; the bottom end of the wave energy float (4) is fixedly connected with a heaving plate (29), and the lower cross beam (1) is fixedly connected between the two heaving plates (29).
3. The wind and wave combined power generation device according to claim 2, characterized in that, The connecting mechanism includes an upper support ring (19) and a lower support ring (20). The upper support ring (19) and the lower support ring (20) are fixedly sleeved on the top of the outer side wall of the semi-submersible floating body (2). The upper support ring (19) and the lower support ring (20) are arranged at intervals up and down. A steel arm (14) is fixedly connected to the outer side wall of the upper support ring (19). The steel arm (14) is horizontally arranged. One end of an inclined first support arm (13) is fixedly connected to the top of the steel arm (14), and the other end of the first support arm (13) is fixedly connected to the top of the semi-submersible floating body (2). One end of an inclined second support arm (18) is fixedly connected to the bottom of the steel arm (14), and the other end of the second support arm (18) is fixedly connected to the outer side wall of the lower support ring (20). One end of the steel arm (14) away from the upper support ring (19) is rotatably connected to a single point mooring disc (16) through a bearing (15). A plurality of fairlead holes (17) are formed in the single point mooring disc (16), and the mooring system is fixedly connected to the single point mooring disc (16) through the fairlead holes (17).
4. A wind and wave combined power generation device according to claim 3, characterized in that, The mooring system includes a plurality of mooring chains, and the mooring chains correspond to the fairlead holes (17) one by one. One end of the mooring chain is fixedly connected in the fairlead hole (17), and the other end of the mooring chain is fixedly connected to the bottom wall of the pool.
5. A wind and wave combined power generation device according to claim 2, characterized in that, The dual-rotor fan mechanism includes two towers (7), the bottom of the towers (7) is fixedly connected to the top of the semi-submersible body (2), the tops of the two towers (7) are far apart from each other and are fixedly connected by a cable (9), the top of the towers (7) is fixedly connected to the top of the semi-submersible body (2) which is provided with the connecting mechanism, and a fan (8) is provided at the top of the towers (7). A first support rib (6) is provided between the bottom end of the tower (7) and the top end of the semi-submersible body (2), and a second support rib (10) is provided between the top end of the tower (7) and the fan (8).
6. A wind and wave combined power generation device according to claim 2, characterized in that, The wave energy capture mechanism includes multiple wave energy floats (4), which are evenly arranged along the length of the middle crossbeam (3). The bottom end of each wave energy float (4) is fixedly connected to one end of a third support arm (23), and the other end of the third support arm (23) is rotatably connected to a second rotating joint (24). The second rotating joint (24) is fixedly connected to the middle crossbeam (3), and the energy harvesting system is fixedly connected to the top end of the wave energy float (4).
7. A wind and wave combined power generation device according to claim 6, characterized in that, The energy harvesting system includes multiple energy harvesting hydraulic rods (5), each corresponding to a wave energy float (4). The bottom end of each energy harvesting hydraulic rod (5) is rotatably connected to a first rotating joint (22), which is fixedly connected to the top end of the wave energy float (4). The top end of each energy harvesting hydraulic rod (5) is rotatably connected to a third rotating joint (25), and multiple third rotating joints (25) are fixedly connected to a transverse support beam (11). The transverse support beam (11) is fixedly connected to the top end of the upper crossbeam (28) through multiple vertical support beams (27). The rodless cavity of the energy harvesting hydraulic rod (5) is connected to a hydraulic cylinder through a pipeline.
8. A wind and wave combined power generation device according to claim 7, characterized in that, A stroke adjustment component (21) is provided between the bottom end of the energizing hydraulic rod (5) and the first rotary joint (22), and between the top end of the energizing hydraulic rod (5) and the third rotary joint (25).
9. A test apparatus for a wind-wave combined power generation device, used to test the wind-wave combined power generation device according to any one of claims 1-8.
10. A test method for a wind-wave combined power generation device, based on the test apparatus for the wind-wave combined power generation device as described in claim 9, characterized in that, Includes the following steps: Complete the assembly of the semi-submersible platform mechanism and adjust it to the target draft using counterweights; Install a dual-rotor wind turbine mechanism, precisely adjust the blade pitch angle, and connect and integrate the float of the wave energy capture mechanism with the hydraulic cylinder and pipeline of the energy harvesting system. Deploy the mooring system, arrange the mooring chains as required, and adjust the pretension; Various sensors of the data acquisition system are installed in key parts such as the semi-submersible platform structure, the dual-rotor fan structure, the mooring chain and the energy harvesting system, and the cables are connected to the data acquisition terminal.