Blade root stud fatigue damage calculation method, device and equipment and storage medium

Abstract

The invention discloses a blade root stud fatigue damage calculation method and device, equipment and a storage medium, and relates to the technical field of mechanical engineering, and the method comprises the steps: obtaining a blade root stud calculation model, and replacing a target structure in the blade root stud calculation model to obtain a simplified model; acquiring a grid model based on the simplified model, rigidly coupling a beam unit corresponding to a solid stud in the grid model with a nut and a screw sleeve, and flexibly coupling a variable-diameter section with a fillet in the grid model with the beam unit to obtain a target finite element model; and performing size parameterization on key structure parameters in different structure parameters corresponding to the target finite element model to obtain a target structure parameter combination, and calculating blade root stud fatigue damage corresponding to the preset blade root stud when the variable-diameter section with the fillet is at the ultimate strength based on the target structure parameter combination. The beam unit is rigidly coupled with the nut and the threaded sleeve, and the variable-diameter section with the fillet is flexibly coupled with the beam unit, so that the modeling is more accurate, and the obtained fatigue damage is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical engineering, and in particular to a blade root stud fatigue damage calculation method, device, equipment and storage medium. Background Art

[0002] The ultimate and fatigue parametric optimization analysis of wind turbine blade root studs is an important research topic. Wind turbine blade bolts are generally thin rod double-ended studs with variable diameters. The maximum ultimate strength of the blade root studs is generally at the variable diameter, and the maximum fatigue damage is generally at the thread. Therefore, the ultimate and fatigue parametric optimization analysis of the blade root studs is of great significance to improving the reliability and life of wind turbines.

[0003] Existing technical solutions generally use Hypermesh or APDL (ANSYS Parametric Design Language) for modeling. The studs are modeled using equal-section beam elements with different cross-sectional areas, and the variable diameter is simplified to one or more equal-section beam elements. The influence of the variable cross-section and the fillet at the transition point is ignored, which will lead to certain errors in the calculation results and affect the accuracy of the ultimate strength and fatigue strength. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a blade root stud fatigue damage calculation method, device, equipment and storage medium, which can rigidly couple the beam unit with the nut and the screw sleeve, and flexibly couple the variable diameter fillet with the beam unit, so as to make the modeling more accurate, thereby making the obtained fatigue damage more accurate. The specific scheme is as follows:

[0005] In a first aspect, the present application provides a method for calculating blade root stud fatigue damage, comprising:

[0006] Modeling the preset blade root stud using preset modeling software and different structural parameters of components in the preset blade root stud to obtain a corresponding blade root stud calculation model, and replacing the target structure in the blade root stud calculation model using preset geometry software to obtain a corresponding simplified model;

[0007] A mesh model is obtained based on the simplified model, and beam units corresponding to the solid studs in the mesh model are rigidly coupled with the nuts and the screw sleeves respectively, and a radius reducing section with rounded corners corresponding to the solid studs in the mesh model is flexibly coupled with the beam units to obtain a target finite element model;

[0008] According to the preset geometric software, key structural parameters among the different structural parameters corresponding to the target finite element model are dimensionally parameterized to obtain a corresponding target structural parameter combination, and based on the target structural parameter combination, the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded variable diameter section is at the ultimate strength is calculated.

[0009] Optionally, the using of preset modeling software and different structural parameters of components in the preset blade root stud to model the preset blade root stud comprises:

[0010] Acquiring the different structural parameters of the components in the preset blade root stud, and determining parameter ranges of the different structural parameters;

[0011] The preset blade root stud is modeled according to the preset modeling software and the parameter range; wherein any structural parameter among the different structural parameters has the parameter range corresponding to itself.

[0012] Optionally, the replacing the target structure in the blade root stud calculation model by using preset geometry software includes:

[0013] Using the preset geometry software, the bearing rollers in the blade root stud calculation model are replaced with a target number of preset rod units, and using the preset geometry software, the solid stud in the blade root stud calculation model is cut into the rounded reduced diameter section, the stud thread section and the stud thin rod section;

[0014] The stud threaded section and the stud thin rod section are replaced with the beam unit to obtain the beam unit threaded section and the beam unit thin rod section.

[0015] Optionally, acquiring a grid model based on the simplified model includes:

[0016] The hub in the simplified model is set as a circular hub prosthesis, and the blade in the simplified model is set as a blade root flange, a bolt sleeve and a blade ply to obtain a corresponding simplified blade, and a parametric optimization analysis is performed based on the circular hub prosthesis and the simplified blade to obtain optimal structural parameters according to the corresponding analysis results;

[0017] The simplified model is calibrated and calculated according to the optimal structural parameters to obtain the grid model corresponding to the simplified model.

[0018] Optionally, the beam unit corresponding to the solid stud in the grid model is rigidly coupled with the nut and the screw sleeve respectively, and the diameter-changing section with rounded corners corresponding to the solid stud in the grid model is flexibly coupled with the beam unit, including:

[0019] The beam unit threaded section of the solid stud in the grid model is rigidly coupled with the nut and the screw sleeve respectively, and the rounded diameter reducing section of the blade root stud in the grid model is flexibly coupled with the beam unit threaded section and the beam unit thin rod section respectively.

[0020] Optionally, the step of performing dimension parameterization on key structural parameters among the different structural parameters corresponding to the target finite element model to obtain corresponding target structural parameters includes:

[0021] Dimensionally parameterizing the key structural parameters among the different structural parameters corresponding to the target finite element model to obtain the ultimate strength of the radius-changing section with rounded corners and the stress increment of the beam unit thread section in the target finite element model under different structural parameter conditions;

[0022] The stress increment ranking of the beam unit thread segment is obtained according to the ultimate strength and the thread stress increment, and the target structural parameter combination is obtained according to the stress increment ranking.

[0023] Optionally, the calculating, based on the target structural parameter combination, the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded variable diameter section is at the ultimate strength includes:

[0024] loading a target assembly preload corresponding to the target finite element model according to the target structural parameter combination, and acquiring a thread stress increment curve corresponding to the preset blade root stud according to the target assembly preload;

[0025] The blade root stud fatigue damage corresponding to the preset blade root stud when the rounded reduced diameter section is at the ultimate strength is calculated according to the thread growth stress curve and the target fatigue calculation algorithm.

[0026] In a second aspect, the present application provides a blade root stud fatigue damage calculation device, comprising:

[0027] A simplified model acquisition module, used to model the preset blade root stud by using preset modeling software and different structural parameters of components in the preset blade root stud to obtain a corresponding blade root stud calculation model, and to replace a target structure in the blade root stud calculation model by using preset geometry software to obtain a corresponding simplified model;

[0028] A finite element model acquisition module, used for acquiring a mesh model based on the simplified model, rigidly coupling the beam units corresponding to the solid studs in the mesh model with the nuts and the screw sleeves respectively, and flexibly coupling the filleted reduced diameter sections corresponding to the solid studs in the mesh model with the beam units, so as to obtain a target finite element model;

[0029] A fatigue damage calculation module is used to parameterize the dimensions of key structural parameters among the different structural parameters corresponding to the target finite element model according to the preset geometric software to obtain a corresponding target structural parameter combination, and calculate the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded variable diameter section is at the ultimate strength based on the target structural parameter combination.

[0030] In a third aspect, the present application provides an electronic device, including:

[0031] Memory, used to store computer programs;

[0032] A processor is used to execute the computer program to implement the aforementioned blade root stud fatigue damage calculation method.

[0033] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the aforementioned blade root stud fatigue damage calculation method.

[0034] In the present application, the preset blade root stud is first modeled using preset modeling software and different structural parameters of components in the preset blade root stud to obtain a corresponding blade root stud calculation model, and the target structure in the blade root stud calculation model is replaced using preset geometric software to obtain a corresponding simplified model, and then a mesh model is obtained based on the simplified model, and the beam units corresponding to the solid stud in the mesh model are rigidly coupled with the nut and the screw sleeve respectively, and the rounded diameter reducing section corresponding to the solid stud in the mesh model is flexibly coupled with the beam unit to obtain a target finite element model, and finally, the key structural parameters among the different structural parameters corresponding to the target finite element model are dimensionally parameterized according to the preset geometric software to obtain a corresponding target structural parameter combination, and the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded diameter reducing section is at the ultimate strength is calculated based on the target structural parameter combination. It can be seen that the present application obtains a finite element model by rigidly coupling the beam units corresponding to the solid studs in the grid model with the nuts and the screw sleeves respectively, and flexibly coupling the reduced diameter sections with rounded corners corresponding to the solid studs in the grid model with the beam units, thereby avoiding the problem of inaccurate modeling caused by ignoring the influence of the reduced diameter rounded corners, and ensuring the accuracy of the obtained finite element model; by using an accurate finite element model to obtain structural parameters, and then calculating the fatigue damage corresponding to the blade root studs, the accuracy of the calculation results is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 A flow chart of a blade root stud fatigue damage calculation method provided in this application;

[0037] Figure 2 A schematic flow chart of a specific blade root stud fatigue damage calculation method provided in this application;

[0038] Figure 3 A schematic diagram of a blade root stud model provided in this application;

[0039] Figure 4 A schematic diagram of a detailed model of a blade root part provided for this application;

[0040] Figure 5 A simplified model schematic diagram of a blade root part provided in this application;

[0041] Figure 6 A schematic diagram of a blade root stud coupling method provided in this application;

[0042] Figure 7 A schematic diagram of a coupling model of a blade root stud and a rounded reducing section provided in this application;

[0043] Figure 8 A schematic diagram of a blade root stud finite element model provided in this application;

[0044] Fig. 9 A partial schematic diagram of a blade root stud finite element model provided in this application;

[0045] Fig.10 A schematic diagram of fatigue damage of a blade root stud under a condition of variable diameter fillet change provided in the present application; wherein (a) is a schematic diagram of the change of variable diameter limit stress, and (b) is a schematic diagram of the change of fatigue damage of the blade root stud;

[0046] Fig.11 A schematic diagram of fatigue damage of a blade root stud under the condition of a change in thickness of a connecting disc provided in the present application; wherein (a) is a schematic diagram of the change in the limit stress of the variable diameter, and (b) is a schematic diagram of the change in fatigue damage of the blade root stud;

[0047] Fig.12A schematic diagram of fatigue damage of a blade root stud under the condition of a change in the depth of a bolt sleeve countersink provided in this application; wherein (a) is a schematic diagram of the change in the limit stress of the variable diameter, and (b) is a schematic diagram of the change in fatigue damage of the blade root stud;

[0048] Fig.13 A schematic diagram of fatigue damage of a blade root stud under the condition of a thin rod diameter change provided in the present application; wherein (a) is a schematic diagram of the change of the limit stress of the diameter change, and (b) is a schematic diagram of the change of fatigue damage of the blade root stud;

[0049] Fig.14 A schematic diagram of bolt stress calculation results provided for this application;

[0050] Fig.15 A schematic diagram of the structure of a blade root stud fatigue damage calculation device provided in this application;

[0051] Fig.16 A structural diagram of an electronic device provided for this application. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] At present, when modeling the blade root stud, the stud is modeled using equal-section beam units of different cross-sectional areas, and the variable diameter is simplified to one or more equal-section beam units. This modeling method ignores the influence of the variable cross-section and the fillet at the transition, thereby reducing the accuracy of the ultimate strength accuracy and fatigue strength calculation results. To this end, the present application provides a blade root stud fatigue damage calculation method, which makes the modeling more accurate by rigidly coupling the beam unit with the nut and the screw sleeve, and flexibly coupling the fillet variable diameter section with the beam unit, so that the obtained fatigue damage is more accurate.

[0054] See also Figure 1 As shown, an embodiment of the present invention discloses a method for calculating fatigue damage of a blade root stud, comprising:

[0055] Step S11, using preset modeling software and different structural parameters of components in the preset blade root stud to model the preset blade root stud to obtain a corresponding blade root stud calculation model, and using preset geometry software to replace the target structure in the blade root stud calculation model to obtain a corresponding simplified model.

[0056] In this embodiment, the process of blade root stud fatigue damage calculation is as follows: Figure 2As shown, a geometric model is established in a geometric module, that is, a process of modeling a blade root stud using different structural parameters of components in the blade root stud in a preset modeling software, specifically including: obtaining the different structural parameters of the components in the preset blade root stud, and determining the parameter ranges of the different structural parameters; modeling the preset blade root stud according to the preset modeling software and the parameter range; wherein any structural parameter in the different structural parameters has a parameter range corresponding to itself; for example, obtaining the radius R of the variable diameter fillet in the blade root stud, the thickness H of the connecting disk, and the countersink of the bolt sleeve; The hole depth L and the thin rod diameter D are determined, and the value ranges of the corresponding structural parameters of the above-mentioned different parts are determined. It can be understood that the structural parameters of each different part have a corresponding parameter range. For example, the value range of the radius R of the variable diameter fillet determined according to the actual modeling situation is 0-400mm, the value range of the thickness H of the connecting disk is 0-80mm, the value range of the bolt sleeve countersink depth L is 350-550mm, and the value range of the thin rod diameter D is 30-34mm. The blade root stud is modeled according to the parameter ranges of different parts to obtain the following: Figure 3 The corresponding blade root stud calculation model shown in FIG. Figure 4 As shown; it can be understood that, in addition to the above four key components and their corresponding key structural parameters, there are other different components in the blade root stud, such as hub dummy, pitch bearing, nut, blade root flange, bolt sleeve, blade root stud, blade ply and other structures. By using preset modeling software, such as Solidworks or UG (Unigraphics NX, a modeling tool) and other software, each component is modeled according to the blade root design parameters and geometric structure dimensions, and finally the above blade root stud calculation model can be obtained. It should be noted that the above Figure 4 The foam strip in the blade root structure shown in FIG. 1 will not affect the accuracy of subsequent fatigue calculations, so the modeling of the foam strip can be omitted. Finally, the following is obtained: Figure 5 The simplified blade root stud calculation model of the blade root part is shown. After the above blade root stud calculation model is established, the Workbench static analysis module needs to be used to set the material, elastic modulus and Poisson's ratio of each component in the blade root stud calculation model for subsequent use.

[0057] In this embodiment, the process of replacing the target structure of the blade root stud calculation model by using the preset collection software specifically includes: using the preset geometry software to replace the bearing rollers in the blade root stud calculation model with the preset rod units of the target number, and using the preset geometry software to cut the solid stud in the blade root stud calculation model into a radius-changing section with a rounded corner, a stud thread section and a stud thin rod section; replacing the stud thread section and the stud thin rod section with beam units to obtain beam unit thread sections and beam unit thin rod sections, the above target structure is the bearing roller and the solid stud in the blade root calculation model; specifically, opening the SpaceClaim geometry software of the above static analysis module, importing the blade root stud calculation model established by Solidworks or UG, and cutting and cleaning the model in SpaceClaim, according to ISO12681 (International Organization for Standardization The bearing rollers are simplified according to the standardization (i.e., an international standard). A single roller is simplified to a preset number, such as 7 compressible rod units with equivalent stiffness. A simplified rod unit of the bearing is established in SpaceClaim. The stud variable diameter section is cut apart, and the threaded section and thin rod section therein are set as Beam188 units, i.e., beam units. After replacing the above structure, the simplified model corresponding to the blade root stud calculation model is obtained. By setting the key structure in the blade root stud calculation model as the target geometric unit, the physical properties of the obtained simplified model are closer to the blade root stud.

[0058] Step S12, obtaining a mesh model based on the simplified model, rigidly coupling the beam units corresponding to the solid studs in the mesh model with the nuts and the sleeves respectively, and flexibly coupling the rounded reduced diameter sections corresponding to the solid studs in the mesh model with the beam units to obtain a target finite element model.

[0059] In this embodiment, it is first necessary to open the Mechanical of the above-mentioned static analysis module, assign the material, elastic modulus, Poisson's ratio and other properties of the components in the above-mentioned blade root stud calculation model to the simplified model, set the unit type of the roller link unit in the model, set the corresponding load points and contact relationships of the model, and divide the mesh to obtain a mesh model. It should be noted that the amount of meshes required for some component structures in the simplified model is large, and the meshing process is relatively cumbersome. In addition, affected by the hub structure, multiple angles need to be calculated when calculating bolt fatigue, which is time-consuming. Therefore, without affecting the calculation accuracy, a hub prosthesis simplified as a ring (circumferentially symmetrical) and a simplified blade simplified as a blade root flange, a bolt sleeve and a blade layer can be used to perform parametric optimization analysis first, and finally perform verification calculations on the complex model. That is, some component structures are equivalently replaced to simplify the meshing calculation process. For example, the process of obtaining the mesh model corresponding to the blade root stud using the simplified model specifically includes: setting the hub in the simplified model to a ring-shaped hub prosthesis, setting the blade in the simplified model to a blade root flange, a bolt sleeve and a blade layer to obtain the corresponding simplified blade, and performing parametric optimization analysis based on the ring-shaped hub prosthesis and the simplified blade to obtain the optimal structural parameters according to the corresponding analysis results; verifying the simplified model according to the optimal structural parameters to obtain the mesh model corresponding to the simplified model, and then obtaining the target finite element model by adding constraints, bolt preloads and loads.

[0060] In this embodiment, the process of rigidly coupling the beam unit in the grid model with the nut and the screw sleeve, and flexibly coupling the filleted diameter reduction section corresponding to the solid stud in the grid model with the beam unit specifically includes: rigidly coupling the beam unit threaded section of the solid stud in the grid model with the nut and the screw sleeve, and flexibly coupling the filleted diameter reduction section of the blade root stud in the grid model with the beam unit threaded section and the beam unit thin rod section; specifically, Figure 6 As shown in the model, the root beam element threaded section is rigidly coupled with the nut and the screw sleeve by using multiple turns of beam elements with a certain stiffness, and the filleted variable diameter section is flexibly coupled with the beam element threaded section and the beam element thin rod section to ensure that the interaction force and displacement between these components can be accurately transmitted during the calculation process. This can more accurately simulate the influence of the fillet of the variable cross-section and its transition in the actual structure and improve the accuracy of the calculation results. Figure 7The figure shows the model of the coupling part after the coupling is completed. By simplifying the hub into a circular ring prosthesis and using the simplified circular ring hub prosthesis (circumferentially symmetrical) to perform parametric optimization analysis first, and then finally performing verification calculations on the complex model, the workload of the meshing process is reduced and the efficiency of mesh model construction is improved; by coupling the entity of the blade root stud with the beam unit, the influence of the variable cross-section and the fillet at the transition in the actual structure is accurately simulated, thereby improving the accuracy of the calculation results.

[0061] Step S13, parameterizing the dimensions of key structural parameters among the different structural parameters corresponding to the target finite element model according to the preset geometric software to obtain a corresponding target structural parameter combination, and calculating the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded variable diameter section is at the ultimate strength based on the target structural parameter combination.

[0062] In this embodiment, Figure 8 and Fig. 9 The figure shows a process of parameterizing the size of key structural parameters in different structural parameters corresponding to the target finite element model according to the target finite element model obtained from the mesh model to obtain the corresponding target structural parameter combination, which specifically includes: parameterizing the size of the key structural parameters in different structural parameters corresponding to the target finite element model to obtain the ultimate strength of the filleted variable diameter section and the stress increment of the beam unit thread section in the target finite element model under different structural parameter conditions; obtaining the stress increment sorting of the beam unit thread section according to the ultimate strength and the thread stress increment, and obtaining the target structural parameter combination according to the stress increment sorting; specifically, in SpaceClaim, the factors affecting the ultimate strength of the blade root variable diameter and the thread stress are sorted. The key structural parameters of the increment and fatigue strength, namely, the above R, H, L, and D are parameterized in size, and the target finite element model is loaded with the maximum bolt assembly preload and ultimate load. The parametric solution function of Workbench is used to obtain the variable diameter ultimate strength and thread stress increment of the blade root stud under different structural parameters, and the thread stress increment ranking when the ultimate strength of the blade root stud just meets the required requirements is obtained, wherein the minimum thread stress increment is the target structural parameter combination in which the ultimate strength just meets the allowable requirements and the fatigue damage of the blade root stud is minimized; for example, in a specific implementation, the above variable diameter fillet R is parameterized, that is, the variable diameter fillet R is used as a variable, and H, L, and D are any fixed values ​​within the range, to obtain the following: Fig.10 The variable diameter limit strength and thread stress increment of the blade root stud under different variable diameter fillet conditions shown in FIG. 1 are shown in FIG. 2 . In another specific embodiment, the thickness H of the connecting disk is parameterized, that is, the thickness H of the connecting disk is used as a variable, and R, L, and D are any fixed values ​​within a range, and the following is obtained: Fig.11The variable diameter ultimate strength and thread stress increment of the blade root stud under different connection disk thickness conditions shown in the figure; in the third specific implementation manner, the bolt sleeve countersink depth L is parameterized, that is, the bolt sleeve countersink depth L is used as a variable, and R, H, and D are any fixed values ​​within the range, and the following is obtained: Fig.12 The variable diameter ultimate strength and thread stress increment of the blade root stud under different connection disk thickness conditions shown in the figure; in the fourth specific implementation method, the thin rod diameter D is parameterized, that is, the thin rod diameter D is used as a variable, and R, H, and L are any fixed values ​​within the range, and the following is obtained: Fig.13 The reduced diameter ultimate strength and thread stress increment of the blade root stud under different slender rod diameter conditions are shown.

[0063] The above process of calculating the fatigue damage of the blade root stud according to the target structural parameters specifically includes: loading the target assembly preload corresponding to the target finite element model according to the target structural parameters, and obtaining the thread stress increment curve corresponding to the preset blade root stud according to the target assembly preload; calculating the blade root stud fatigue damage corresponding to the preset blade root stud when the radius-changing section is at the ultimate strength according to the thread stress increment curve and the target fatigue calculation algorithm; specifically, according to the target structural parameters obtained in the above process, reloading the minimum assembly preload corresponding to the target finite element model, that is, the above target assembly preload, the applied external load range (min~0~max) needs to envelope the fatigue load range, extracting the external load and the blade root stud thread stress increment curve, and calculating the cumulative fatigue damage of the thread through the MarkoV fatigue load and SN curve (that is, the fatigue-life curve) by linear interpolation, that is, the target fatigue calculation algorithm, wherein the bolt stress calculation result in the above process is as follows Fig.14 By parameterizing the dimensions of different key structural parameters, the optimal solutions for blade root variable diameter ultimate strength, thread stress increment and fatigue strength under different structural parameters can be automatically obtained when solving in Mechanical, which greatly improves modeling efficiency and analysis efficiency and reduces design costs.

[0064] It can be seen that, in this application, by setting the key structure in the blade root stud calculation model as the target geometric unit, the physical properties of the obtained simplified model are closer to the blade root stud; by coupling the entity of the blade root stud with the beam unit, the influence of the variable cross-section and the fillet at the transition in the actual structure is accurately simulated, thereby improving the accuracy of the calculation results.

[0065] See also Fig.15 As shown, the embodiment of the present application discloses a blade root stud fatigue damage calculation device, comprising:

[0066] A simplified model acquisition module 11 is used to model the preset blade root stud by using preset modeling software and different structural parameters of components in the preset blade root stud to obtain a corresponding blade root stud calculation model, and to replace the target structure in the blade root stud calculation model by using preset geometric software to obtain a corresponding simplified model;

[0067] A finite element model acquisition module 12 is used to acquire a mesh model based on the simplified model, rigidly couple the beam units corresponding to the solid studs in the mesh model with the nuts and the screw sleeves respectively, and flexibly couple the reduced diameter sections with rounded corners corresponding to the solid studs in the mesh model with the beam units, so as to obtain a target finite element model;

[0068] The fatigue damage calculation module 13 is used to parameterize the size of the key structural parameters among the different structural parameters corresponding to the target finite element model according to the preset geometric software to obtain the corresponding target structural parameter combination, and calculate the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded variable diameter section is at the ultimate strength based on the target structural parameter combination.

[0069] It can be seen that the present application obtains a finite element model by rigidly coupling the beam units in the grid model corresponding to the blade root stud with the nut and the screw sleeve respectively, and flexibly coupling the rounded variable diameter section in the grid model with the beam units, thereby avoiding the problem of inaccurate modeling caused by ignoring the influence of the variable diameter fillet, and ensuring the accuracy of the obtained finite element model; by using an accurate finite element model to obtain structural parameters, and then calculating the fatigue damage corresponding to the blade root stud, the accuracy of the calculation results is guaranteed.

[0070] In some specific embodiments, the simplified model acquisition module 11 may specifically include:

[0071] a parameter range determination unit, configured to obtain the different structural parameters of the components in the preset blade root stud and determine parameter ranges of the different structural parameters;

[0072] A model building unit is used to model the preset blade root stud according to the preset modeling software and the parameter range; wherein any structural parameter among the different structural parameters has the parameter range corresponding to itself.

[0073] In some specific implementations, the simplified model acquisition module 11 may specifically include:

[0074] A first structural replacement unit is used to replace the bearing rollers in the blade root stud calculation model with a target number of preset rod units using the preset geometric software, and to cut the solid stud in the blade root stud calculation model into the rounded reduced diameter section, the stud thread section and the stud thin rod section using the preset geometric software;

[0075] The second structural replacement unit is used to replace the stud threaded section and the stud thin rod section with the beam unit to obtain the beam unit threaded section and the beam unit thin rod section.

[0076] In some specific implementations, the finite element model acquisition module 12 may specifically include:

[0077] A parametric analysis unit is used to set the hub in the simplified model as a circular hub prosthesis, and set the blade in the simplified model as a blade root flange, a bolt sleeve and a blade ply to obtain a corresponding simplified blade, and perform a parametric optimization analysis based on the circular hub prosthesis and the simplified blade to obtain optimal structural parameters according to the corresponding analysis results;

[0078] A grid model acquisition unit is used to perform verification calculation on the simplified model according to the optimal structural parameters to obtain the grid model corresponding to the simplified model.

[0079] In some specific implementations, the finite element model acquisition module 12 may specifically include:

[0080] The component coupling unit is used to rigidly couple the beam unit threaded section of the solid stud in the grid model with the nut and the screw sleeve respectively, and to flexibly couple the rounded reduced diameter section of the blade root stud in the grid model with the beam unit threaded section and the beam unit thin rod section respectively.

[0081] In some specific implementations, the fatigue damage calculation module 13 may specifically include:

[0082] A stress increment acquisition unit, used for parameterizing the key structural parameters among the different structural parameters corresponding to the target finite element model, so as to obtain the ultimate strength of the radius-changing section with rounded corners and the stress increment of the beam unit thread section in the target finite element model under different structural parameter conditions;

[0083] A structural parameter combination acquisition unit is used to acquire the stress increment ranking of the beam unit thread segment according to the ultimate strength and the thread stress increment, and acquire the target structural parameter combination according to the stress increment ranking.

[0084] In some specific implementations, the fatigue damage calculation module 13 may specifically include:

[0085] an incremental curve acquisition unit, configured to load a target assembly preload corresponding to the target finite element model according to the target structural parameter combination, and acquire a thread stress incremental curve corresponding to the preset blade root stud according to the target assembly preload;

[0086] A fatigue damage acquisition unit is used to calculate the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded reduced diameter section is at the ultimate strength according to the thread growth stress curve and a target fatigue calculation algorithm.

[0087] Furthermore, the present application also discloses an electronic device. Fig.16 This is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content in the diagram cannot be regarded as any limitation on the scope of use of the present application.

[0088] Fig.16 The present invention provides a schematic diagram of the structure of an electronic device 20 provided in an embodiment of the present application. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 is used to store a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the blade root stud fatigue damage calculation method disclosed in any of the aforementioned embodiments. In addition, the electronic device 20 in this embodiment may specifically be an electronic computer.

[0089] In this embodiment, the power supply 23 is used to provide working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present application, and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0090] In addition, the memory 22 as a carrier for storing resources may be a read-only memory, a random access memory, a disk or an optical disk, etc. The resources stored thereon may include an operating system 221, a computer program 222, etc., and the storage method may be temporary storage or permanent storage.

[0091] The operating system 221 is used to manage and control the hardware devices and computer program 222 on the electronic device 20, and may be Windows Server, Netware, Unix, Linux, etc. In addition to the computer program that can be used to complete the blade root stud fatigue damage calculation method executed by the electronic device 20 disclosed in any of the aforementioned embodiments, the computer program 222 may further include a computer program that can be used to complete other specific tasks.

[0092] Furthermore, the present application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the blade root stud fatigue damage calculation method disclosed above is implemented. For the specific steps of the method, reference may be made to the corresponding contents disclosed in the above embodiments, and no further description will be given here.

[0093] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0094] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0095] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0096] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0097] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for calculating blade root stud fatigue damage, characterized in that: include: Modeling the preset blade root stud using preset modeling software and different structural parameters of components in the preset blade root stud to obtain a corresponding blade root stud calculation model, and replacing the target structure in the blade root stud calculation model using preset geometry software to obtain a corresponding simplified model; A mesh model is obtained based on the simplified model, and beam units corresponding to the solid studs in the mesh model are rigidly coupled with the nuts and the screw sleeves respectively, and a radius reducing section with rounded corners corresponding to the solid studs in the mesh model is flexibly coupled with the beam units to obtain a target finite element model; According to the preset geometric software, key structural parameters among the different structural parameters corresponding to the target finite element model are dimensionally parameterized to obtain a corresponding target structural parameter combination, and based on the target structural parameter combination, the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded variable diameter section is at the ultimate strength is calculated.

2. The blade root stud fatigue damage calculation method according to claim 1, characterized in that: The method of modeling the preset blade root stud by using preset modeling software and different structural parameters of components in the preset blade root stud comprises: Acquiring the different structural parameters of the components in the preset blade root stud, and determining parameter ranges of the different structural parameters; The preset blade root stud is modeled according to the preset modeling software and the parameter range; wherein any structural parameter among the different structural parameters has the parameter range corresponding to itself.

3. The blade root stud fatigue damage calculation method according to claim 1, characterized in that: The replacing the target structure in the blade root stud calculation model by using preset geometry software includes: Using the preset geometry software, the bearing rollers in the blade root stud calculation model are replaced with a target number of preset rod units, and using the preset geometry software, the solid stud in the blade root stud calculation model is cut into the rounded reduced diameter section, the stud thread section and the stud thin rod section; The stud threaded section and the stud thin rod section are replaced with the beam unit to obtain the beam unit threaded section and the beam unit thin rod section.

4. The blade root stud fatigue damage calculation method according to claim 1, characterized in that: The step of acquiring a grid model based on the simplified model comprises: The hub in the simplified model is set as a circular hub prosthesis, and the blade in the simplified model is set as a blade root flange, a bolt sleeve and a blade ply to obtain a corresponding simplified blade, and a parametric optimization analysis is performed based on the circular hub prosthesis and the simplified blade to obtain optimal structural parameters according to the corresponding analysis results; The simplified model is calibrated and calculated according to the optimal structural parameters to obtain the grid model corresponding to the simplified model.

5. The blade root stud fatigue damage calculation method according to claim 1, characterized in that: The beam units corresponding to the solid studs in the grid model are rigidly coupled with the nuts and the screw sleeves respectively, and the reduced diameter sections with rounded corners corresponding to the solid studs in the grid model are flexibly coupled with the beam units, including: The beam unit threaded section of the solid stud in the grid model is rigidly coupled with the nut and the screw sleeve respectively, and the rounded diameter reducing section of the blade root stud in the grid model is flexibly coupled with the beam unit threaded section and the beam unit thin rod section respectively.

6. The blade root stud fatigue damage calculation method according to claim 1, characterized in that: The step of parameterizing the size of the key structural parameters among the different structural parameters corresponding to the target finite element model to obtain a corresponding target structural parameter combination includes: Dimensionally parameterizing the key structural parameters among the different structural parameters corresponding to the target finite element model to obtain the ultimate strength of the radius-changing section with rounded corners and the stress increment of the beam unit thread section in the target finite element model under different structural parameter conditions; The stress increment ranking of the beam unit thread segment is obtained according to the ultimate strength and the thread stress increment, and the target structural parameter combination is obtained according to the stress increment ranking.

7. The blade root stud fatigue damage calculation method according to any one of claims 1 to 6, characterized in that: The calculating, based on the target structural parameter combination, the blade root stud fatigue damage corresponding to the preset blade root stud when the radius-changing section with rounded corners is at the ultimate strength comprises: loading a target assembly preload corresponding to the target finite element model according to the target structural parameter combination, and acquiring a thread stress increment curve corresponding to the preset blade root stud according to the target assembly preload; The blade root stud fatigue damage corresponding to the preset blade root stud when the rounded reduced diameter section is at the ultimate strength is calculated according to the thread growth stress curve and the target fatigue calculation algorithm.

8. A blade root stud fatigue damage calculation device, characterized in that: include: A simplified model acquisition module, used to model the preset blade root stud by using preset modeling software and different structural parameters of components in the preset blade root stud to obtain a corresponding blade root stud calculation model, and to replace a target structure in the blade root stud calculation model by using preset geometry software to obtain a corresponding simplified model; A finite element model acquisition module, used for acquiring a mesh model based on the simplified model, rigidly coupling the beam units corresponding to the solid studs in the mesh model with the nuts and the screw sleeves respectively, and flexibly coupling the filleted reduced diameter sections corresponding to the solid studs in the mesh model with the beam units, so as to obtain a target finite element model; A fatigue damage calculation module is used to parameterize the dimensions of key structural parameters among the different structural parameters corresponding to the target finite element model according to the preset geometric software to obtain a corresponding target structural parameter combination, and calculate the blade root stud fatigue damage corresponding to the preset blade root stud when the rounded variable diameter section is at the ultimate strength based on the target structural parameter combination.

9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the blade root stud fatigue damage calculation method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Used to store a computer program, which, when executed by a processor, implements the blade root stud fatigue damage calculation method according to any one of claims 1 to 7.

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