Method and apparatus for calculating the energy transfer efficiency of multi-drum wind turbines for high-altitude wind power

Abstract

This invention relates to the field of high-altitude wind power technology, and more particularly to a method and apparatus for calculating the energy transfer efficiency of multi-drum systems used in high-altitude wind power. The method involves inputting the physical parameters of the cable and m drums into pre-defined CAE software for simulation to obtain the energy transfer efficiency of the multi-drum system. This enables rapid and efficient calculation of energy transfer efficiency, reveals the core factors affecting the energy transfer performance of multi-drum systems, provides a theoretical basis and data reference for the design of multi-drum energy distribution devices, improves energy transfer efficiency, and achieves energy conservation and emission reduction.

Description

Technical Field

[0001] This invention relates to the field of high-altitude wind power technology, and in particular to a method and apparatus for calculating the energy transfer efficiency of multi-drum systems in high-altitude wind power. Background Technology

[0002] In the field of key technologies and equipment for high-altitude wind power generation with large umbrella-shaped roadbeds, current methods mainly rely on experimental measurements to obtain the energy transfer efficiency of the drums, thereby evaluating the overall performance of the energy transfer structure. While these experimental methods offer high accuracy and can directly reflect the performance level of the energy transfer structure, they are costly to implement, and the results of a single experiment are only valid for a specific structure or operating condition, thus having certain limitations. Therefore, this invention proposes a method and apparatus for calculating the energy transfer efficiency of multiple drums in high-altitude wind power to address the aforementioned technical problems. Summary of the Invention

[0003] This invention describes a method and apparatus for calculating the energy transfer efficiency of multi-drum wind turbines in high-altitude wind power, which can quickly and efficiently calculate the energy transfer efficiency of the drums.

[0004] According to a first aspect, the present invention provides a method for calculating the energy transfer efficiency of a multi-drum system for high-altitude wind power, comprising:

[0005] Obtain the physical parameters of the cable and m rollers; wherein, at least some of the rollers are wound with one turn of cable, one end of the cable is connected to the umbrella assembly of the high-altitude wind power, and m≥3;

[0006] The physical parameters are input into a preset CAE software for simulation to obtain the energy transfer efficiency of the multi-roller system.

[0007] According to a second aspect, the present invention provides a calculation device for the energy transfer efficiency of a multi-drum system in high-altitude wind power, comprising:

[0008] The acquisition unit is configured to acquire physical parameters of the cable and m rollers; wherein at least a portion of the rollers are wound with one turn of cable, one end of the cable is connected to the umbrella assembly of the high-altitude wind power, and m≥3;

[0009] The simulation unit is configured to input the physical parameters into a preset CAE software for simulation to obtain the energy transfer efficiency of the multi-roller system.

[0010] The method and apparatus for calculating the energy transfer efficiency of multi-drum wind power provided by the present invention obtain the energy transfer efficiency of the multi-drum by inputting the physical parameters of the cable and m drums into a preset CAE software for simulation. This enables rapid and efficient calculation of energy transfer efficiency, reveals the core factors affecting the energy transfer performance of multi-drum, provides a theoretical basis and data reference for the design of multi-drum energy distribution devices, improves energy transfer efficiency, and achieves energy saving and consumption reduction. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A flowchart illustrating a method for calculating the energy transfer efficiency of a multi-drum system for high-altitude wind power according to one embodiment is shown.

[0013] Figure 2 A schematic block diagram of a calculation device for multi-drum energy transfer efficiency for high-altitude wind power is shown according to one embodiment;

[0014] Figure 3 A schematic diagram of the energy transfer process in a multi-roller full-process simulation according to one embodiment is shown;

[0015] Figure 4 A schematic diagram of a roller principle according to one embodiment is shown;

[0016] Figure 5 A schematic diagram of the assembly position of the roller and cable according to one embodiment is shown;

[0017] Figure 6 A schematic diagram of simulated boundary conditions for a roller and cable according to one embodiment is shown;

[0018] Figure 7 A schematic diagram of simulation results for a roller and cable according to one embodiment is shown. Detailed Implementation

[0019] The solution provided by the present invention will now be described with reference to the accompanying drawings.

[0020] Figure 1 This diagram illustrates a flowchart of a method for calculating the energy transfer efficiency of a multi-drum system for high-altitude wind power according to one embodiment. It is understood that this method can be executed by any device, equipment, platform, or cluster of devices with computing and processing capabilities. Figure 1 As shown, the method includes:

[0021] Step 101: Obtain the physical parameters of the cable and m rollers; wherein, at least some of the rollers are wound with one turn of cable, and one end of the cable is connected to the umbrella assembly of the high-altitude wind power, m≥3;

[0022] Step 102: Input the physical parameters into the preset CAE software for simulation to obtain the energy transfer efficiency of the multi-roller system.

[0023] In this embodiment, the energy transfer efficiency of the multi-roller system is obtained by inputting the physical parameters of the cable and m rollers into a preset CAE software for simulation. This allows for rapid and efficient calculation of energy transfer efficiency, reveals the core factors affecting the energy transfer performance of the multi-roller system, provides a theoretical basis and data reference for the design of multi-roller energy distribution devices, improves energy transfer efficiency, and achieves energy saving and consumption reduction.

[0024] It should be noted that the multi-drum energy distribution device is used to convert the linear motion energy of ultra-long cables in high-altitude wind power into rotary motion energy. The cable is wound around multiple drums to achieve energy "diversion," and a planetary gear transmission system is used to "converge" the energy from the multiple drums. Its power comes from the high-altitude parachute ladder at one end of the cable. The driving friction generated by the cable winding around the drum surface drives the drums to rotate, which in turn drives the planetary gear system, thereby powering an external generator and realizing the power transmission process throughout the entire high-altitude wind power operation.

[0025] Compared to experimental measurement methods, if CAE technology and theory can be integrated, and feasibility can be verified through a small number of experiments, then CAE simulation-based energy conversion efficiency prediction methods have advantages such as low execution cost, short implementation cycle, and wide applicability.

[0026] In one embodiment of the present invention, the physical parameters include the cross-sectional radius of the drum, the height of the drum, the envelope angle between the drum and the cable, the material parameters of the drum and the cable, the equivalent coefficient of friction between the drum and the cable, the tension of the cable before entering the drum, the axial velocity of the cable and the diameter of the cable, and the material parameters include density, elastic modulus and Poisson's ratio.

[0027] In one embodiment of the present invention, step 102 may specifically include:

[0028] The physical parameters are input into the preset CAE software for simulation to obtain the torque and speed of each roller;

[0029] The energy transfer efficiency of the multi-drum system is obtained based on the tension of the cable before it enters the drum, the axial velocity of the cable, the torque and rotational speed of each drum.

[0030] In one embodiment of the present invention, the energy transfer efficiency is calculated using the following formula:

[0031]

[0032] In the formula, η is the energy transfer efficiency, and T i Let n be the torque of the i-th roller. i Let be the rotational speed of the i-th drum, Q1 be the tension of the cable before it enters the drum, and v be the axial velocity of the cable.

[0033] In the actual simulation process, firstly, a model of the winding of rollers and cables is drawn using 3D modeling software such as Solidworks as the model material. The number of rollers is m, generally m=5. The specific winding method is as follows: Figure 3 As indicated by the label.

[0034] like Figure 4 As shown, a simulation scheme for a multi-roller distribution device is designed based on an ideal structure of a regular polygon to simplify complex calculations. The size of the roller structure is limited to the red area, and the bottom must not exceed the yellow dotted line, otherwise interference will occur. The calculation formula is as follows:

[0035] Please continue reading Figure 3 An assembly was constructed for the simulation example. Solid elements were used for the rollers and support frames to ensure simulation accuracy, while beam elements were used for the cables to improve computational efficiency. The envelope angle was 144 degrees. The blue segment represents the area not in contact with the rollers, and the length of this segment was calculated using the following formula:

[0036] Based on the established model, the data is imported into Abaqus (the default CAE software, but other CAE software can also be used, without specific limitations) using the common file format x_t, and then assembled. The outer surface of one side of each roller is coupled to a separate reference point; for example... Figure 5 As shown, a fixed reference point is used to set boundary conditions, with an initial cable tension of 100 tons, and the cable tail end is fixed. The groove pitch parameter of the drum in this invention is consistent with the initial cable pitch parameter, and this parameter determines the cable assembly movement position on the connecting drum, i.e.

[0037] Next, the material properties of the cable and drum in the simulation are set: density, elastic modulus, Poisson's ratio, etc., and the cross-sectional properties of the beam elements are defined, including the cable diameter, etc. The calculation parameters required for the simulation are also set, defining the global friction coefficient (i.e., the equivalent friction coefficient) based on the penalty function, with a tangential friction coefficient of 0.2 and normal contact as hard contact. The drum is meshed as a C3D8R hexahedral eight-node mesh, and the cable as a T3D2 two-node linear three-dimensional truss element mesh, as shown below. Figure 6 As shown. Inputting the above physical parameters into the CAE software yields the following result. Figure 7 The simulation results are shown below. Figure 7 It can be seen that the tension of the cable decreases with each passing roller (i.e., the length of the arrow represents the magnitude of the tension). Finally, in the basic example, the number of rollers involved in the work is changed according to the wind speed, the rope winding method is changed, and the number of working rollers is reduced without disassembling the rollers. The initial steps are repeated, and the cable winding method corresponding to the highest energy transfer efficiency is obtained through simulation calculation.

[0038] In one embodiment of the present invention, the m rollers are arranged in a regular polygon and satisfy the following formula:

[0039]

[0040] In the formula, R1 is the distance from the center of the roller to the center of the circle formed by all the roller centers, R c Where is the radius of the drum, L is the total length of the cable not in contact with the drum, and P is the radius of the drum. r Pz is the pitch of a single turn of the cable helix, θ is the axial movement distance of the cable on the next connecting drum, and θ is the pitch of a single turn of the cable helix. b The envelope angle of a single roller.

[0041] In summary, this invention develops an energy distribution model for cables and multiple rollers based on the friction process of cable-roller winding. A complete multi-roller energy transfer prediction simulation program is established using CAE technology to calculate efficiency losses during energy transfer. This allows for rapid and accurate acquisition of the amount of work done by different rollers and energy transfer efficiency under varying wind speeds. Based on multiple modes of cable winding around rollers, this invention combines simulation technology with scientific, efficient, and intelligent methods to cross-verify with theoretical calculations. This enables rapid optimization of cable winding methods, improving the engineering's adaptability to changes in the external environment while reducing experimental testing costs. Under suitable conditions, this invention can approximate the actual transmission process of a multi-roller energy distribution device by increasing computational load (increasing the number of grids and reducing the number of analysis steps). Compared to methods that obtain multi-roller energy transfer data experimentally, the prediction method proposed in this invention has advantages such as wide applicability, fast prediction speed, and low implementation cost. It can shorten the design and calculation cycle of multi-roller energy transfer devices and reduce development costs. Compared with other methods, such as designing multi-roller energy transfer devices based on experience, the multi-roller energy transfer design method proposed in this invention based on finite element simulation has a more scientific theoretical design basis and a more intelligent and convenient design process, which helps to improve overall performance and enhance product competitiveness.

[0042] The foregoing has described specific embodiments of the invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0043] According to another embodiment, the present invention provides a calculation device for the energy transfer efficiency of a multi-drum system for high-altitude wind power. Figure 2 A schematic block diagram of a calculation device for multi-drum energy transfer efficiency in high-altitude wind power is shown according to one embodiment. It will be understood that this device can be implemented by any apparatus, device, platform, or cluster of devices with computing and processing capabilities. Figure 2 As shown, the device includes an acquisition unit 201 and a simulation unit 202. The main functions of each component are as follows:

[0044] The acquisition unit 201 is configured to acquire physical parameters of the cable and m rollers; wherein at least a portion of the rollers are wound with a single turn of cable, one end of the cable is connected to the umbrella assembly of the high-altitude wind power, and m ≥ 3;

[0045] The simulation unit 202 is configured to input the physical parameters into a preset CAE software for simulation to obtain the energy transfer efficiency of the multi-roller.

[0046] In a preferred embodiment, the physical parameters include the cross-sectional radius of the drum, the height of the drum, the envelope angle between the drum and the cable, the material parameters of the drum and the cable, the equivalent coefficient of friction between the drum and the cable, the tension of the cable before entering the drum, the axial velocity of the cable, and the diameter of the cable. The material parameters include density, elastic modulus, and Poisson's ratio.

[0047] In a preferred embodiment, the simulation unit is configured to perform the following operations:

[0048] The physical parameters are input into a preset CAE software for simulation to obtain the torque and rotational speed of each roller;

[0049] The energy transfer efficiency of the multi-drum system is obtained based on the tension of the cable before it enters the drum, the axial velocity of the cable, the torque and rotational speed of each drum.

[0050] In a preferred embodiment, the energy transfer efficiency is calculated using the following formula:

[0051]

[0052] In the formula, η is the energy transfer efficiency, and T i Let n be the torque of the i-th roller. i Let be the rotational speed of the i-th drum, Q1 be the tension of the cable before it enters the drum, and v be the axial velocity of the cable.

[0053] In a preferred embodiment, the m rollers are arranged in a regular polygon and satisfy the following formula:

[0054]

[0055] In the formula, R1 is the distance from the center of the roller to the center of the circle formed by all the roller centers, R c Where is the radius of the drum, L is the total length of the cable not in contact with the drum, and P is the radius of the drum. r Pz is the pitch of a single turn of the cable helix, θ is the axial movement distance of the cable on the next connecting drum, and θ is the pitch of a single turn of the cable helix. b Let be the envelope angle of a single roller.

[0056] According to another embodiment, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed in a computer, causes the computer to perform a combination Figure 1 The method described.

[0057] According to another embodiment, an electronic device is also provided, including a memory and a processor, wherein the memory stores executable code, and when the processor executes the executable code, it implements a combination... Figure 1 The method described.

[0058] The various embodiments in this invention are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0059] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this invention can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium.

[0060] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calculating the energy transfer efficiency of multi-drum systems used in high-altitude wind power, characterized in that, include: Obtain the physical parameters of the cable and m rollers; wherein, at least some of the rollers are wound with one turn of cable, one end of the cable is connected to the umbrella assembly of the high-altitude wind power, and m≥3; The physical parameters are input into a preset CAE software for simulation to obtain the energy transfer efficiency of the multi-roller system. The physical parameters include the cross-sectional radius of the drum, the height of the drum, the envelope angle between the drum and the cable, the material parameters of the drum and the cable, the equivalent coefficient of friction between the drum and the cable, the tension of the cable before entering the drum, the axial velocity of the cable, and the diameter of the cable. The material parameters include density, elastic modulus, and Poisson's ratio. The step of inputting the physical parameters into preset CAE software for simulation to obtain the energy transfer efficiency of the multi-roller includes: The physical parameters are input into a preset CAE software for simulation to obtain the torque and rotational speed of each roller; The energy transfer efficiency of the multi-drum system is obtained based on the tension of the cable before it enters the drum, the axial velocity of the cable, the torque and rotational speed of each drum. The energy transfer efficiency is calculated using the following formula: In the formula, η is the energy transfer efficiency, and T i Let n be the torque of the i-th roller. i Let be the rotational speed of the i-th drum, Q1 be the tension of the cable before it enters the drum, and v be the axial velocity of the cable.

2. The method according to claim 1, characterized in that, m rollers are arranged in a regular polygon and satisfy the following formula: In the formula, R1 is the distance from the center of the roller to the center of the circle formed by all the roller centers, R c Where is the radius of the drum, L is the total length of the cable not in contact with the drum, and P is the radius of the drum. r Pz is the pitch of a single turn of the cable helix, θ is the axial movement distance of the cable on the next connecting drum, and θ is the pitch of a single turn of the cable helix. b The envelope angle of a single roller.

3. A calculation device for the energy transfer efficiency of multi-drum systems in high-altitude wind power, characterized in that, include: The acquisition unit is configured to acquire physical parameters of the cable and m rollers; wherein at least a portion of the rollers are wound with one turn of cable, one end of the cable is connected to the umbrella assembly of the high-altitude wind power, and m≥3; The simulation unit is configured to input the physical parameters into a preset CAE software for simulation to obtain the energy transfer efficiency of the multi-roller. The physical parameters include the cross-sectional radius of the drum, the height of the drum, the envelope angle between the drum and the cable, the material parameters of the drum and the cable, the equivalent coefficient of friction between the drum and the cable, the tension of the cable before entering the drum, the axial velocity of the cable, and the diameter of the cable. The material parameters include density, elastic modulus, and Poisson's ratio. The simulation unit is used to perform the following operations: The physical parameters are input into a preset CAE software for simulation to obtain the torque and rotational speed of each roller; The energy transfer efficiency of the multi-drum system is obtained based on the tension of the cable before it enters the drum, the axial velocity of the cable, the torque and rotational speed of each drum. The energy transfer efficiency is calculated using the following formula: In the formula, η is the energy transfer efficiency, and T i Let n be the torque of the i-th roller. i Let be the rotational speed of the i-th drum, Q1 be the tension of the cable before it enters the drum, and v be the axial velocity of the cable.

4. The apparatus according to claim 3, characterized in that, m rollers are arranged in a regular polygon and satisfy the following formula: In the formula, R1 is the distance from the center of the roller to the center of the circle formed by all the roller centers, R c Where is the radius of the drum, L is the total length of the cable not in contact with the drum, and P is the radius of the drum. r Pz is the pitch of a single turn of the cable helix, θ is the axial movement distance of the cable on the next connecting drum, and θ is the pitch of a single turn of the cable helix. b The envelope angle of a single roller.

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