Finite element analysis method for lower box body of wind power speed reducer
The lower box of the wind power reducer is analyzed in detail through the Workbench software based on the finite element analysis method, which solves the problem of inaccurate calculation of the lower box strength in the existing technology, and achieves the effect of precise design and improving equipment reliability and load-bearing capacity.
Patent Information
- Application Number
- CN202510416135.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2025-06-27
AI Technical Summary
The prior art is difficult to accurately calculate the strength of the box under the wind power reducer, resulting in inaccurate design and affecting the reliability and load-bearing capacity of the equipment.
The Workbench software is used to analyze the lower box in detail based on the finite element analysis method. The precise analysis of the strength of the lower box is achieved by establishing component models, assigning physical properties to the material, setting constraints and boundary conditions, performing grid division and solving calculations.
Through this method, the strength of the box can be more accurately analyzed, precise design can be achieved, and the reliability and load-bearing capacity of the wind power reducer can be improved.
Smart Images
Figure CN120217796A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of yaw and pitch control reducers for wind turbines, and in particular to a finite element analysis method for a lower casing of a wind turbine reducer. Background Art
[0002] With the rapid development of the wind power industry in recent years, the technical level of the wind power industry has been improved year by year. At present, the capacity of wind turbines in my country has gradually developed from less than 1MW to 5-10MW, and even 26MW offshore wind turbines have been successfully installed.
[0003] The high power of wind turbines means that the load-bearing capacity and reliability of the yaw and pitch reducer inside the wind turbine are required to be higher. As one of the key parts that bear the main force inside the yaw and pitch reducer, the lower box needs to have a higher load-bearing capacity, and the accuracy of the calculation of the lower box is crucial.
[0004] At first, the industry was almost unable to accurately calculate the strength of the lower box structure, and could only verify it through reducer loading tests, which required a lot of time and effort. In recent years, the industry has begun to use finite element analysis software for simulation analysis, but there is no detailed description or regulation of the accurate algorithm for the lower box. Summary of the invention
[0005] The purpose of the present invention is to provide a finite element analysis method for the lower box of a wind turbine reducer. The method is based on Workbench software and adopts a finite element analysis method to specify the analysis method of the lower box in detail, so that the strength of the lower box can be analyzed more accurately to achieve precise design.
[0006] In order to achieve the above object, the present invention adopts the following technical scheme: A finite element analysis method for a lower box of a wind power reducer comprises the following steps: UG modeling: Establish the lower box component model according to the design parameters and interface dimensions of the yaw pitch reducer; Model import: export the model in UG to a general format model of step or x_t, and then import it into Workbench; Given materials: Based on the commonly used materials of wind turbine yaw and pitch reducers, assign material physical properties to each part; Connection settings: For two parts with fixed relative positions, binding constraints are used; for two parts with relative displacement, friction connection is used, and the friction coefficient is given according to the actual situation; Meshing: The overall patch conformal method is used, and the geometric size is controlled; for key parts, the surface mesh is divided; for key parts, the mesh is encrypted; finally, the mesh quality of the overall model is controlled; Apply boundaries: According to the working environment of the wind power yaw and pitch reducer, the applied boundary conditions need to be consistent with the working forces of the reducer to ensure the accuracy of the boundary conditions; Solve the calculation: Set the Von-Mises equivalent stress, total deformation, and yield strain of the lower housing; Convergence verification: Conduct convergence verification for the maximum stress part calculated for the first time; Result analysis: Analyze the calculated stress and deformation, correct the model according to the calculation results, and correct the connection settings according to the calculation results.
[0007] In actual application, the lower housing component model includes: a lower housing body and an open gear; the open gear is connected to the lower housing body through a spline, and the open gear is provided with an inner ring of a small tapered roller bearing, an outer ring of a small tapered roller bearing, an inner ring of a large tapered roller bearing, and an outer ring of a large tapered roller bearing in the inner region of the lower housing body; the open gear is connected with a large gear ring in the outer region of the lower housing body; the lower housing body has a spigot and an upper flange surface.
[0008] Among them, according to the commonly used materials of the wind power yaw and pitch reducer, when assigning material physical properties to each of its parts, set the material elastic modulus and Poisson's ratio in the software, and the relevant material properties are set according to the relevant national standards of the materials.
[0009] Specifically, for two parts with a fixed relative position, use a bonded constraint; the open gear is bonded to the inner ring of the small tapered roller bearing and the inner ring of the large tapered roller bearing; For two parts with relative displacement, use a frictional connection, and the friction coefficient is given according to the actual situation; the inner ring of the small tapered roller bearing is frictionally connected to the outer ring of the small tapered roller bearing, and the friction coefficient is given as 5E-02; the inner ring of the large tapered roller bearing is frictionally connected to the outer ring of the large tapered roller bearing, and the friction coefficient is given as 5E-02.
[0010] Furthermore, the overall patch conforming method is adopted, and hexahedral mesh control or tetrahedral mesh control is used for the lower housing body; when controlling the geometric dimensions, the overall mesh size is controlled; for key parts, such as the fillet at the bearing mating surface of the lower housing body, the fillet below the spigot of the lower housing body, the fillet of the rib plate of the lower housing body, and the stressed part of the bearing position, surface mesh meshing treatment is carried out; for key parts, such as the fillet at the bearing mating surface of the lower housing body, the fillet below the spigot of the lower housing body, the fillet of the rib plate of the lower housing body, and the stressed part of the bearing position, mesh refinement is carried out; finally, the mesh quality of the overall model is controlled.
[0011] Furthermore, when applying the boundary, the boundary conditions are as follows: adding fixed constraints or tight compression support constraints at the rabbet of the lower box body; adding fixed constraints to the large gear ring; adding the ultimate torque Tmax at the spline of the open gear, and the ultimate torque Tmax is directly given by the customer; adding the ultimate torque Tmax at the upper flange surface of the lower box body.
[0012] Compared with the prior art, the finite element analysis method for the lower box body of the wind power reducer of the present invention has the following advantages: In the finite element analysis method for the lower box body of the wind power reducer provided by the present invention, since the lower box body component model is established according to the design parameters and interface dimensions of the yaw and pitch reducers; the model in UG is exported as a general format model of step or x_t, and then imported into Workbench; according to the commonly used materials of the wind power yaw and pitch reducers, the material physical properties are assigned to each of its parts; for two parts with a fixed relative position, a bonded constraint is adopted; for two parts with relative displacement, a frictional connection is adopted, and the friction coefficient is given according to the actual situation; the overall patch conforming method is adopted and the geometric dimensions are controlled; for key parts, surface mesh meshing is performed; for key parts, mesh encryption is performed; finally, the mesh quality of the overall model is controlled; according to the working environment of the wind power yaw and pitch reducers, the applied boundary conditions need to be consistent with the working forces of the reducer to ensure the accuracy of the boundary conditions; the Von-Mises equivalent stress, total deformation and yield strain of the lower box body are set for solution; for the part with the maximum stress calculated for the first time, convergence verification is performed; the calculated stress and deformation are analyzed, and the model is corrected according to the calculation results, and the connection settings are corrected according to the calculation results; therefore, the finite element analysis method for the lower box body of the wind power reducer provided by the present invention is based on the Workbench software and adopts the finite element analysis method to specify the analysis method of the lower box body in detail, so as to be able to analyze the strength of the lower box body more accurately to achieve precise design. Description of the Drawings
[0013] Figure 1 It is a schematic flow chart of the finite element analysis of the lower box body based on the Workbench software in the finite element analysis method for the lower box body of the wind power reducer provided by the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the lower box body component model in the finite element analysis method for the lower box body of the wind power reducer provided by the embodiment of the present invention.
[0014] Reference Signs: 1 - Open gear; 2 - Lower housing body; 3 - Inner ring of small tapered roller bearing; 4 - Outer ring of small tapered roller bearing; 5 - Inner ring of large tapered roller bearing; 6 - Outer ring of large tapered roller bearing; 7 - Large gear ring; 1a - Spline; 2a - Stopper; 2b - Upper flange surface. Specific embodiments
[0015] In order to solve the problems commonly existing in the art, such as heavy weight of the lower housing, large redundancy, and large deformation of the stressed parts, the embodiments of the present invention are based on the Workbench software. By analyzing the actual stress of the lower housing, a static analysis method for the lower housing is proposed, which can achieve accurate calculation and design of the lower housing.
[0016] For the convenience of understanding, the following combines the accompanying drawings of the specification to describe in detail the finite element analysis method for the lower housing of the wind power reducer provided by the embodiments of the present invention.
[0017] The embodiments of the present invention provide a finite element analysis method for the lower housing of a wind power reducer, as Figure 1 shown, including the following steps: Step S1, UG modeling: Establish a component model of the lower housing according to the design parameters and interface dimensions of the yaw and pitch reducer. Step S2, Model import: Export the model in UG as a general format model of step or x_t, and then import it into Workbench. Step S3, Assign materials: According to the commonly used materials of the wind power yaw and pitch reducer, assign material physical properties to each of its parts. Step S4, Connection setting: For two parts with a fixed relative position, use a bonded constraint; for two parts with relative displacement, use a frictional connection, and the friction coefficient is given according to the actual situation. Step S5, Mesh generation: Overall, use the patch conforming method and perform geometric size control; for key parts, perform surface mesh dissection; for key parts, perform mesh refinement; finally, control the mesh quality of the overall model. Step S6, Apply boundaries: According to the working environment of the wind power yaw and pitch reducer, the applied boundary conditions need to be consistent with the working stress of the reducer to ensure the accuracy of the boundary conditions. Step S7, Solve and calculate: Set to solve the Von-Mises equivalent stress, total deformation, and yield strain of the lower housing. Step S8, Convergence verification: For the maximum stress part calculated for the first time, perform convergence verification (the purpose is to verify mesh independence, that is, to better and truly and effectively obtain the true stress and deformation of the lower housing). Step S9, Result Analysis: Analyze the calculated stress and deformation, correct the model according to the calculation results, and correct the connection settings according to the calculation results.
[0018] Compared with the prior art, the finite element analysis method for the lower box body of the wind power reducer according to the embodiment of the present invention has the following advantages: In the finite element analysis method for the lower box body of the wind power reducer provided by the embodiment of the present invention, since the lower box body component model is established according to the design parameters and interface dimensions of the yaw and pitch reducers; the model in UG is exported as a general format model of step or x_t, and then imported into Workbench; according to the commonly used materials of the wind power yaw and pitch reducers, the material physical properties are assigned to each of its parts; for two parts with a fixed relative position, a bonded constraint is adopted; for two parts with relative displacement, a friction connection is adopted, and the friction coefficient is given according to the actual situation; the overall patch conforming method is adopted and geometric dimension control is carried out; for key parts, surface mesh meshing is carried out; for key parts, mesh encryption is carried out; finally, the mesh quality of the overall model is controlled; according to the working environment of the wind power yaw and pitch reducers, the applied boundary conditions need to be consistent with the working force of the reducer to ensure the accuracy of the boundary conditions; the Von-Mises equivalent stress, total deformation and yield strain of the lower box body are set for solution; for the maximum stress part calculated for the first time, convergence verification is carried out; the calculated stress and deformation are analyzed, the model is corrected according to the calculation results, and the connection settings are corrected according to the calculation results; therefore, the finite element analysis method for the lower box body of the wind power reducer provided by the embodiment of the present invention, which is based on the Workbench software and adopts the finite element analysis method, specifies the lower box body analysis method in detail, so as to be able to analyze the strength of the lower box body more accurately to achieve precise design.
[0019] In actual application, as Figure 2 shown, the above-mentioned lower box body component model may include: a lower box body body 2 and an open gear 1; the open gear 1 can be connected to the lower box body body 2 through a spline 1a, and a small tapered roller bearing inner ring 3, a small tapered roller bearing outer ring 4, a large tapered roller bearing inner ring 5 and a large tapered roller bearing outer ring 6 can be arranged in the inner area of the open gear 1 located in the lower box body body 2; a large gear ring 7 can be connected to the outer area of the open gear 1 located in the lower box body body 2; the lower box body body 2 can have a spigot 2a and an upper flange surface 2b.
[0020] Among them, when assigning the material physical properties to each part according to the commonly used materials of the wind power yaw and pitch reducers, the material elastic modulus and Poisson's ratio can be set in the software, and the relevant material properties are set according to the relevant national standards of the materials.
[0021] Specifically, for two parts with a fixed relative position, a binding constraint can be adopted; for example, the open gear 1, the inner ring 3 of the small tapered roller bearing, and the inner ring 5 of the large tapered roller bearing can adopt a binding connection; For two parts with relative displacement, a friction connection can be adopted, and the friction coefficient is given according to the actual situation; for example, the inner ring 3 of the small tapered roller bearing and the outer ring 4 of the small tapered roller bearing can adopt a friction connection, and the friction coefficient can be given as 5E-02; for example, the inner ring 5 of the large tapered roller bearing and the outer ring 6 of the large tapered roller bearing can adopt a friction connection, and the friction coefficient can be given as 5E-02.
[0022] Furthermore, the patch conforming method is adopted as a whole. For the lower box body 2, hexahedron mesh control can be preferably adopted or tetrahedron mesh control can be adopted secondly; when controlling the geometric dimensions, the overall mesh size is controlled, and it is avoided that the overall mesh is too large to affect the authenticity of the calculation; to avoid the stress concentration phenomenon that does not conform to the actual situation caused by uneven mesh division, for key parts, the fillet at the bearing mating surface in the lower box body 2, the lower fillet of the rabbet 2a of the lower box body 2, the fillet of the rib plate of the lower box body 2, and the stressed part of the bearing position are subjected to surface mesh dissection; for key parts, the fillet at the bearing mating surface in the lower box body 2, the lower fillet of the rabbet 2a of the lower box body 2, the fillet of the rib plate of the lower box body 2, and the stressed part of the bearing position are subjected to mesh encryption; finally, the mesh quality of the overall model is controlled.
[0023] Even further, when applying the boundary, the boundary conditions can be: adding a fixed constraint or a tight compression support constraint at the rabbet 2a of the lower box body 2; adding a fixed constraint to the large gear ring 7; adding the ultimate torque Tmax at the spline 1a of the open gear 1, and the ultimate torque Tmax is directly given by the customer; adding the ultimate torque Tmax at the upper flange surface 2b of the lower box body 2.
[0024] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A finite element analysis method for the lower box of a wind turbine reducer, characterized in that: The following steps are involved: UG modeling: Establish the lower box component model according to the design parameters and interface dimensions of the yaw pitch reducer; Model import: export the model in UG to a general format model of step or x_t, and then import it into Workbench; Given materials: Based on the commonly used materials of wind turbine yaw and pitch reducers, assign material physical properties to each part; Connection settings: For two parts with fixed relative positions, binding constraints are used; for two parts with relative displacement, friction connection is used, and the friction coefficient is given according to the actual situation; Meshing: The overall meshing method is patch conformal, and geometric size control is performed; For key parts, perform surface mesh division; for key parts, perform mesh encryption; finally, control the mesh quality of the overall model; Apply boundary: According to the working environment of wind turbine yaw pitch reducer, the applied boundary conditions need to be consistent with the working force of the reducer to ensure the accuracy of the boundary conditions; Solution calculation: Set to solve the Von-Mises effect force, total deformation and yield strain of the lower box; Convergence verification: Convergence verification is performed on the maximum stress position calculated for the first time; Result analysis: Analyze the calculated stress and deformation, and modify the model and connection settings based on the calculation results.
2. The finite element analysis method for the lower box of a wind power reducer according to claim 1 is characterized in that: The lower box component model includes: a lower box body and an open gear; the open gear is connected to the lower box body through a spline, and the open gear is located in the internal area of the lower box body and is provided with a small tapered roller bearing inner ring, a small tapered roller bearing outer ring, and a large tapered roller bearing inner ring and a large tapered roller bearing outer ring; the open gear is located in the external area of the lower box body and is connected with a large gear ring; the lower box body has a stop and an upper flange surface.
3. The finite element analysis method for the lower box of a wind power reducer according to claim 1 is characterized in that: According to the commonly used materials of wind turbine yaw pitch reducer, when assigning material physical properties to each part, the material elastic modulus and Poisson's ratio are set in the software, and the relevant material properties are set in accordance with the relevant material national standards.
4. The finite element analysis method for the lower box of a wind power reducer according to claim 2 is characterized in that: For two parts with fixed relative positions, binding constraints are adopted; the open gear and the inner ring of the small tapered roller bearing and the inner ring of the large tapered roller bearing are connected by binding; For two parts with relative displacement, friction connection is adopted, and the friction coefficient is given according to actual conditions; the inner ring of the small tapered roller bearing and the outer ring of the small tapered roller bearing are frictionally connected, and the friction coefficient is given as 5E-02; the inner ring of the large tapered roller bearing and the outer ring of the large tapered roller bearing are frictionally connected, and the friction coefficient is given as 5E-02.
5. The finite element analysis method for the lower box of a wind power reducer according to claim 2 is characterized in that: The patch conformal method is adopted as a whole, and the hexahedral mesh control or tetrahedral mesh control is adopted for the lower box body; when the geometric dimension control is performed, the mesh size is controlled as a whole; for the key parts, the fillet of the lower box body and the bearing mating surface, the fillet below the stop of the lower box body, the fillet of the rib plate of the lower box body, and the stress-bearing part of the bearing seat, the surface mesh division processing is performed; for the key parts, the fillet of the lower box body and the bearing mating surface, the fillet below the stop of the lower box body, the fillet of the rib plate of the lower box body, and the stress-bearing part of the bearing seat, the mesh encryption processing is performed; finally, the mesh quality of the overall model is controlled.
6. The finite element analysis method for the lower box of a wind power reducer according to claim 2 is characterized in that: When applying the boundary, the boundary conditions are: adding a fixed constraint or a tight compression support constraint at the stop of the lower box body; adding a fixed constraint to the large ring gear; adding a limit torque Tmax at the spline of the open gear, and the limit torque Tmax is directly given by the customer; adding a limit torque Tmax at the upper flange surface of the lower box body.