A method, system and storage medium for checking and optimizing wind power gearbox strength

Abstract

The present invention discloses a method, system and storage medium for strength verification and optimization of a wind turbine gearbox. The present invention simulates and tests the stresses induced on a support shaft and a support shaft hole in a modeled wind turbine gearbox through finite element software, optimizes the structure with risks, thereby ensuring that the structural design of the support shaft and the support shaft hole that meets the requirements can be finally obtained, thereby improving the service life of the wind turbine gearbox.

Description

Technical Field

[0001] The present invention relates to the field of wind power gearbox structures, and in particular to a method, system and storage medium for strength verification and optimization of a wind power gearbox. Background Art

[0002] Wind energy is a representative type of renewable energy. It is of great significance to protect the environment and maintain ecological balance, as well as to reduce dependence on conventional energy and improve the energy structure. The working principle of wind turbines is that the blades convert wind energy into kinetic energy, which is transmitted to the generator through the transmission system. The generator generates electrical energy and inputs it into the power grid. Among them, the reliability of the transmission system is particularly important. In the case of wind turbine shutdown, transmission chain failure accounts for a large proportion. Therefore, making the transmission system work more reliably is an important measure to extend the power generation time of wind turbines.

[0003] Therefore, it is necessary to test and optimize the structure of the transmission system in the wind turbine gearbox, select the solution with the best strength structure, and ensure the stability of the transmission system. This application proposes a solution to this problem. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a method, system and storage medium for strength verification and optimization of a wind turbine gearbox, which can detect and optimize the strength of the support shaft and support shaft hole in the wind turbine gearbox, and finally obtain a structure of the support shaft and support shaft hole that meets the requirements.

[0005] Technical solution: The method for checking and optimizing the strength of a wind turbine gearbox described in the present invention specifically comprises the following steps:

[0006] S1: Use mapping software to build the geometric model of the wind turbine gearbox;

[0007] S2: Import the geometric model into the finite element software and establish the finite element model;

[0008] S3: Define the unit types of each component of the wind turbine gearbox in the finite element software;

[0009] S4: Define the material properties of each component of the wind turbine gearbox;

[0010] S5: Apply load to the finite element model so that the front bearing seat and the rear bearing seat in the wind turbine gearbox are subjected to bending moment, and the primary gear ring is subjected to torque;

[0011] S6: Apply constraints to the finite element model and fix both sides of the support axis;

[0012] S7: Submit the finite element model to the finite element software for solution, extract the support shaft stress, compare the allowable force of the support shaft material, and evaluate the risk of support shaft fracture; extract the stress of the torque arm support shaft hole, compare the allowable force of the torque arm material, and evaluate the risk of torque arm support shaft hole crushing;

[0013] S8: Based on the assessment results of the risk of support shaft fracture and the risk of torque arm support shaft hole crushing, the structure of the support shaft or support shaft hole with risks is optimized;

[0014] S9: Repeat the process of S1-S7, compare the evaluation results of the support shaft fracture risk and the torque arm support shaft hole crush risk after optimization with those before optimization, and confirm the optimization plan.

[0015] Preferably, the geometric model in S1 includes a support shaft, a torque arm, a ring gear and a middle box.

[0016] Preferably, the unit types of various components of the wind turbine gearbox in S3 are all solid units.

[0017] Preferably, the structure of the support shaft in S7 is optimized by replacing the traditional step structure support shaft with a support shaft with an optical axis structure; the structure of the support shaft hole is optimized by providing an unloading groove at the position where the support shaft hole is connected to the gear ring.

[0018] Preferably, the unloading groove is a groove with an arc-shaped cross-section.

[0019] Beneficial effects:

[0020] (1) The present invention uses finite element analysis to analyze the stress of the support shaft and the support shaft hole, conducts structural strength testing, and assesses risks.

[0021] (2) The present invention solves the problem of stress concentration by replacing the support shaft of the traditional step structure with an optical shaft, thereby reducing the stress borne by the support shaft;

[0022] (3) The present invention reduces the stress of the support shaft hole opening and reduces the risk of the support shaft hole being crushed by setting the unloading groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the finite element model of the wind turbine gearbox in the finite element software;

[0024] Figure 2 It is a schematic diagram of the bending moment force on the front bearing seat and the rear bearing seat when the finite element model applies load;

[0025] Figure 3 It is a schematic diagram of the torque force borne by the primary gear ring when the finite element model applies load;

[0026] Figure 4 It is a schematic diagram of applying constraints to the finite element model and fixing both sides of the support shaft;

[0027] Figure 5 It is the stress condition of the support shaft output by the finite element analysis software before optimization;

[0028] Figure 6 It is the stress condition of the support shaft hole output by the finite element analysis software before optimization;

[0029] Figure 7 is a side sectional view of the support shaft and the support shaft hole after optimization;

[0030] Figure 8 yes Figure 3 Enlarged view of point A in the middle;

[0031] Fig. 9 It is the stress condition of the support shaft output by the optimized finite element analysis software;

[0032] Fig.10 It is the stress condition of the support shaft hole output by the optimized finite element analysis software. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific embodiments.

[0034] The specific steps of the method for checking and optimizing the strength of a wind turbine gearbox of the present invention are as follows:

[0035] S1: Use drawing software to build a geometric model of the wind turbine gearbox, where the geometric model includes a support shaft, a torque arm, a gear ring and a middle box;

[0036] S2: Import the geometric model into the finite element software and establish a finite element model, such as Figure 1 As shown;

[0037] S3: Define the unit types of each component of the wind turbine gearbox in the finite element software, all of which use solid units;

[0038] S4: define the material properties of each component of the wind turbine gearbox. In this embodiment, the torque arm and the middle box body are made of ductile iron with a representative grade of QT400, and the support shaft and the gear ring are made of structural steel;

[0039] S5: Apply loads to the finite element model, such as Figure 2-3 As shown, the front bearing seat and the rear bearing seat in the wind power gearbox are subjected to bending moment, and the primary gear ring is subjected to torque;

[0040] S6: Apply constraints to the finite element model and fix both sides of the support axis, such as Figure 4 As shown;

[0041] S7: Submit the finite element model to the finite element software for solution and extract the support shaft stress, such as Figure 5 As shown, the axial stress of the support shaft is 438Mpa at this time. Since the support shaft structure here adopts the traditional stepped structure, the diameter of the support shaft is large in the middle and small at both ends. The rounded corners of the two diameter transition areas are stress concentration areas. According to the measured results, it can be found that the stone stress is relatively large, and there is a risk of fracture.

[0042] Extract the stress of the torque arm support shaft hole, such as Figure 6 As shown, the stress of the support shaft hole is 202Mpa. Since the support shaft twists in the support shaft hole in the traditional structure, the stress borne by the hole mouth area is greater than that of the middle area. According to the measured structure, the support shaft hole also has the risk of collapse.

[0043] S8: According to the actual stress borne by the support shaft and the torque arm support shaft hole, the structure of the support shaft and the support shaft hole is optimized, such as Figure 7-8 As shown, a support shaft with an optical axis structure is used to replace a support shaft with a traditional step structure. In this case, the support shaft does not have steps, and there is no stress concentration problem. At the same time, the structure of the support shaft hole is optimized to set an unloading groove at the position where the support shaft hole is connected to the gear ring. The unloading groove is a groove with a circular arc section. Such a design can reduce the stress of the hole and reduce the risk of crushing.

[0044] S9: Repeat the process of S1-S7, such as Figure 9-10 As shown, after the optimization, the support shaft of the optical axis structure cooperates with the setting of the unloading groove, and the measured stress of the support shaft is 268Mpa, and the stress of the support shaft hole is 196Mpa, both of which are greatly improved compared with before optimization. This optimization scheme meets the requirements.

[0045] This embodiment also provides a system for checking and optimizing the strength of a wind turbine gearbox support shaft, comprising a network interface, a memory and a processor, wherein the network interface is used to receive and send signals during the process of sending and receiving information with other external network elements; the memory is used to store computer program instructions that can be run on the processor; and the processor is used to execute the steps of the above-mentioned method for checking and optimizing the strength of a wind turbine gearbox when running the computer program instructions.

[0046] The present embodiment also provides a computer storage medium, which stores a computer program, and the method described above can be implemented when the processor executes the computer program. The computer readable medium can be considered to be tangible and non-temporary. Non-limiting examples of non-temporary tangible computer-readable media include non-volatile memory circuits (such as flash memory circuits, erasable programmable read-only memory circuits or mask read-only memory circuits), volatile memory circuits (such as static random access memory circuits or dynamic random access memory circuits), magnetic storage media (such as analog or digital tapes or hard drives) and optical storage media (such as CDs, DVDs or Blu-ray discs), etc. The computer program includes processor executable instructions stored on at least one non-temporary tangible computer-readable medium. The computer program may also include or rely on stored data. The computer program may include a basic input / output system (BIOS) that interacts with the hardware of a special-purpose computer, a device driver that interacts with a specific device of a special-purpose computer, one or more operating systems, user applications, background services, background applications, etc.

[0047] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0048] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

Claims

1. A method for checking and optimizing the strength of a wind turbine gearbox, characterized in that: The specific steps include: S1: Use mapping software to build the geometric model of the wind turbine gearbox; S2: Import the geometric model into the finite element software and establish the finite element model; S3: Define the unit types of each component of the wind turbine gearbox in the finite element software; S4: Define the material properties of each component of the wind turbine gearbox; S5: Apply load to the finite element model so that the front bearing seat and the rear bearing seat in the wind turbine gearbox are subjected to bending moment, and the primary gear ring is subjected to torque; S6: Apply constraints to the finite element model and fix both sides of the support axis; S7: Submit the finite element model to the finite element software for solution, extract the support shaft stress, compare the allowable stress of the support shaft material, and evaluate the risk of support shaft fracture; Extract the stress of the torque arm support shaft hole, compare it with the allowable stress of the torque arm material, and evaluate the risk of torque arm support shaft hole crushing; S8: Based on the assessment results of the risk of support shaft fracture and the risk of torque arm support shaft hole crushing, the structure of the support shaft or support shaft hole with risks is optimized, specifically: The structure of the support shaft with risks is optimized by replacing the traditional step-structure support shaft with a support shaft with a smooth shaft structure; the structure of the support shaft hole with risks is optimized by setting an unloading groove at the position where the support shaft hole is connected to the gear ring; S9: Repeat the process of S1-S7, compare the evaluation results of the support shaft fracture risk and the torque arm support shaft hole crush risk after optimization with those before optimization, and confirm the optimization plan.

2. A method for checking and optimizing the strength of a wind turbine gearbox according to claim 1, characterized in that: The geometric model in S1 includes a support shaft, a torque arm, a ring gear and a middle box.

3. A method for checking and optimizing the strength of a wind turbine gearbox according to claim 1, characterized in that: The unit types of various components of the wind turbine gearbox in S3 are all solid units.

4. A method for checking and optimizing the strength of a wind turbine gearbox according to claim 1, characterized in that: The unloading groove is a groove with a circular arc cross section.

5. A system for checking and optimizing the strength of a wind turbine gearbox, characterized in that: The system comprises a network interface, a memory and a processor, wherein: The network interface is used to receive and send signals during the process of sending and receiving information with other external network elements; The memory is used to store computer program instructions that can be executed on the processor; The processor is used to execute a method for checking and optimizing the strength of a wind turbine gearbox according to any one of claims 1 to 4 when running the computer program instructions.

6. A computer storage medium, characterized in that: The computer storage medium stores a method for checking and optimizing the strength of a wind turbine gearbox, and when the method for checking and optimizing the strength of a wind turbine gearbox is executed by at least one processor, the method for checking and optimizing the strength of a wind turbine gearbox according to any one of claims 1 to 4 is implemented.

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