Bolt connection dynamics modeling method, device, equipment, storage medium and product

Abstract

The invention discloses a bolt connection dynamic modeling method, device and equipment, a storage medium and a product, and relates to the technical field of draught fans, in the disclosed bolt connection dynamic modeling method, a micro-convex body with the elastic-plastic deformation capacity on the joint surface of a connected piece is simulated through a virtual medium, and the virtual medium is used for simulating the micro-convex body with the elastic-plastic deformation capacity on the joint surface of the connected piece; the method comprises the following steps: determining initial parameter information of a joint surface of a connected piece; and determining characteristic parameters of the virtual medium according to the initial parameter information, and constructing a bolt connection dynamic model through the characteristic parameters. According to the method, the micro-convex body with the elastic-plastic deformation capacity is simulated through the virtual medium, and the determined elastic material of the virtual medium corresponds to the rigidity characteristic of the joint surface of the connected piece; according to the bolt connection dynamic model established by the invention, the rigidity characteristic of the joint surface of the connected piece due to vibration can be reflected through the elastic material of the virtual medium, so that the dynamic modeling precision of the fan is effectively improved, and the reliability of simulation guidance optimization is further improved.

Description

Technical Field

[0001] The present application relates to the field of wind turbine technology, and in particular to a method, device, equipment, storage medium and product for bolt connection dynamics modeling. Background Art

[0002] At present, because wind turbines need to be frequently disassembled and repaired, the fixed connection between large and medium-sized structural parts of wind turbines is mostly bolted, which destroys the continuity of the wind turbine system structure. Therefore, the dynamic contact characteristics of bolted connections in various places in the wind turbine have an important influence on the accurate establishment of the wind turbine dynamics model.

[0003] When establishing the dynamic model of the fan system, the bolt connection with a fixed connection function is usually regarded as a binding (rigid) connection. However, the above method will ignore the stiffness characteristics of the joint surface of the connected parts due to vibration. Under actual working conditions, when the joint surface of the connected parts is subjected to alternating loads, it will produce local micro-vibrations and show certain stiffness characteristics. Therefore, the prior art adopts a binding (rigidity) simplified processing method, which will reduce the accuracy of the bolt connection dynamic modeling in the fan dynamic model to a certain extent, and then reduce the accuracy of the fan dynamic model, resulting in low reliability of simulation-guided optimization.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of this application is to provide a method, device, equipment, storage medium and product for bolt connection dynamic modeling, aiming to solve the technical problem that the existing technology will reduce the accuracy of bolt connection dynamic modeling to a certain extent, thereby reducing the accuracy of the fan dynamic model, resulting in low reliability of simulation-guided optimization.

[0006] To achieve the above object, the present application provides a method for dynamic modeling of bolted connection, which is applied to a wind turbine generator set, wherein the wind turbine generator set includes a plurality of connected parts connected by bolts, and micro-convex bodies with elastic-plastic deformation ability on the joint surfaces of the connected parts are simulated using virtual media, and the method includes:

[0007] Determining initial parameter information of the joint surface of the connected parts;

[0008] Determining characteristic parameters of the virtual medium according to the initial parameter information, wherein the characteristic parameters correspond to the stiffness characteristics of the joint surface of the connected component;

[0009] A bolt connection dynamics model is constructed using the characteristic parameters.

[0010] In one embodiment, the step of determining the characteristic parameters of the virtual medium according to the initial parameter information includes:

[0011] Determining the mechanical characteristic parameters of the joint surface of the connected parts based on the initial parameter information;

[0012] Determining the physical property parameters of the virtual medium through the mechanical characteristic parameters;

[0013] Determine current design parameters based on the initial parameter information, wherein the current design parameters include first design parameters corresponding to the connected member and second design parameters corresponding to the bolt;

[0014] Determining geometric parameters of the virtual medium using the current design parameters;

[0015] The characteristic parameters of the virtual medium are determined according to the physical property parameters and the geometric parameters.

[0016] In one embodiment, the step of determining the physical property parameters of the virtual medium by using the mechanical characteristic parameters includes:

[0017] Determining the contact stiffness of the joint surface of the connected parts according to the mechanical characteristic parameters;

[0018] Determining a modulus parameter of the virtual medium according to the contact stiffness;

[0019] Determining the density of the virtual medium according to the density of each of the connected components;

[0020] The physical property parameters of the virtual medium are determined by the contact stiffness, the modulus parameter, the density and a preset Poisson's ratio.

[0021] In one embodiment, the contact stiffness includes normal compression contact stiffness and shear contact stiffness, the simulation parameters include elastic simulation parameters and shear modulus parameters, and the step of determining the modulus parameters of the virtual medium according to the contact stiffness includes:

[0022] Determining the normal compressive contact stiffness in the vertical direction of the joint surface of the connected parts according to the mechanical parameters;

[0023] Determine the shear contact stiffness in a direction parallel to the joint surface of the connected parts according to the mechanical parameters;

[0024] determining the elastic modulus parameter of the virtual medium based on the normal compressive contact stiffness;

[0025] The shear modulus parameter of the virtual medium is determined based on the shear contact stiffness.

[0026] In one embodiment, the step of determining the geometric parameters of the virtual medium by using the current design parameters includes:

[0027] Acquire a preset parameter prediction model, wherein the preset parameter prediction model represents a nonlinear mapping relationship between a design parameter and a geometric diameter of the virtual medium;

[0028] Predicting a current geometric diameter of the virtual medium corresponding to the current design parameters by using the preset size prediction model;

[0029] Obtaining a preset thickness of the virtual medium;

[0030] The geometric parameters of the virtual medium are determined according to the current geometric diameter and the preset thickness.

[0031] In one embodiment, before the step of obtaining the preset size prediction model, the method further includes:

[0032] Obtain design parameters corresponding to different connected parts and different bolts;

[0033] Selecting sample points from the design parameters;

[0034] Determine the bolt influence area diameter under different design parameters according to the sample points;

[0035] Constructing a bolt connection simulation data set according to the diameter of each bolt influence area;

[0036] Model training is performed through the sample points and the bolt connection simulation data set to obtain a preset size prediction model that characterizes the nonlinear mapping relationship between the design parameters and the geometric diameter of the virtual medium.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a bolt connection dynamics modeling device, the device comprising:

[0038] An information determination module, used to determine initial parameter information of the joint surface of the connected parts;

[0039] A virtual medium module, used to determine characteristic parameters of a virtual medium according to the initial parameter information, wherein the characteristic parameters correspond to the stiffness characteristics of the joint surface of the connected member;

[0040] The model building module is used to build a bolt connection dynamic model through the characteristic parameters.

[0041] In addition, to achieve the above-mentioned objectives, the present application also proposes a bolt connection dynamic modeling device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the bolt connection dynamic modeling method as described above.

[0042] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the bolt connection dynamic modeling method described above are implemented.

[0043] In addition, to achieve the above-mentioned purpose, the present application also proposes a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the bolt connection dynamics modeling method as described above are implemented.

[0044] One or more technical solutions proposed in this application have at least the following technical effects:

[0045] The scheme disclosed in the present application is applied to a wind turbine generator set, which includes a plurality of connected parts connected by bolts, and the micro-convex bodies with elastic-plastic deformation ability on the joint surfaces of the connected parts are simulated by virtual media. The present application determines the initial parameter information of the joint surfaces of the connected parts; determines the characteristic parameters of the virtual medium according to the initial parameter information, and constructs a bolt connection dynamic model through the characteristic parameters. Since the present application simulates the micro-convex bodies with elastic-plastic deformation ability through virtual media, the elastic material of the determined virtual medium corresponds to the stiffness characteristics of the joint surfaces of the connected parts. Therefore, compared with the prior art that adopts a simplified binding processing method that ignores the stiffness characteristics, the bolt connection dynamic model established by the present application can reflect the stiffness characteristics of the joint surfaces of the connected parts due to vibration through the elastic material of the virtual medium, making the bolt connection dynamic model more accurate, thereby effectively improving the accuracy of wind turbine dynamic modeling, and further improving the reliability of simulation-guided optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0047] In order to more clearly illustrate the embodiments of the present application 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 It is a schematic diagram of bolt connection in a wind turbine generator set;

[0049] Figure 2 This is a schematic diagram of the flow chart of the first embodiment of the bolt connection dynamics modeling method of the present application;

[0050] Figure 3 This is a schematic diagram of microscopic contact of a bolt connection in the first embodiment of the bolt connection dynamics modeling method of the present application;

[0051] Figure 4 This is a schematic diagram of a virtual medium equivalent model in the first embodiment of the bolt connection dynamics modeling method of the present application;

[0052] Figure 5 This is a schematic flow chart of a second embodiment of the bolt connection dynamics modeling method of the present application;

[0053] Figure 6 This is a schematic diagram of a bolt connection dynamics model in the second embodiment of the bolt connection dynamics modeling method of the present application;

[0054] Figure 7 This is a schematic flow chart of a third embodiment of the bolt connection dynamics modeling method of the present application;

[0055] Figure 8 A schematic diagram of the experimental design sample points in the third embodiment of the bolt connection dynamics modeling method of the present application;

[0056] Fig. 9 This is a schematic diagram of the module structure of the bolt connection dynamics modeling device of this application;

[0057] Fig.10 Schematic diagram of the equipment structure of the hardware operating environment involved in the bolt connection dynamics modeling method in the embodiment of the present application.

[0058] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0059] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0060] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0061] The main solution of the embodiment of the present application is: the micro-convex bodies with elastic-plastic deformation ability on the joint surfaces of the connected parts are simulated using virtual media, and the bolt connection dynamics modeling equipment determines the initial parameter information of the joint surfaces of the connected parts; the characteristic parameters of the virtual medium are determined according to the initial parameter information, and the characteristic parameters correspond to the stiffness characteristics of the joint surfaces of the connected parts; the bolt connection dynamics model is constructed through the characteristic parameters.

[0062] In this embodiment, for ease of description, the bolt connection dynamics modeling device is used as the execution subject for explanation below.

[0063] At present, because wind turbines need to be frequently disassembled and repaired, the fixed connection between large and medium-sized structural parts of wind turbines is mostly bolted, which destroys the continuity of the wind turbine system structure. Therefore, the dynamic contact characteristics of bolted connections in wind turbines have an important influence on the accurate establishment of bolt connection dynamics models.

[0064] like Figure 1 As shown, Figure 1 The figure is a schematic diagram of bolt connection in a wind turbine generator set. When establishing the dynamic model of the wind turbine system, for bolts with a fixed connection function, when the connected parts A and B are connected by bolts, the bolt connection is usually regarded as a binding (rigid) connection, ignoring the stiffness characteristics of the joint surface of the connected parts due to vibration. However, when the joint surface of the connected parts (the surface where the connected parts A and B contact each other) is subjected to alternating loads, local micro-vibrations will occur, showing certain stiffness characteristics. Therefore, the above method will reduce the accuracy of the bolt connection dynamic modeling to a certain extent, resulting in low reliability of simulation-guided optimization.

[0065] The present application provides a solution, which simulates micro-convex bodies with elastic-plastic deformation ability through virtual media, that is, the micro-convex bodies are equivalent to virtual media, and the elastic material of the determined virtual medium corresponds to the stiffness characteristics of the joint surfaces of the connected parts. Therefore, compared with the prior art that adopts the simplified binding processing method of ignoring the stiffness characteristics, the bolt connection dynamic model established in the present application can reflect the stiffness characteristics of the joint surfaces of the connected parts due to vibration through the elastic material of the virtual medium, making the bolt connection dynamic model more accurate, thereby effectively improving the accuracy of the fan dynamic modeling, and then improving the reliability of simulation-guided optimization.

[0066] It should be noted that the executor of this embodiment can be a computing service device with bolt connection dynamics modeling, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device that can realize the above functions, a bolt connection dynamics modeling device, etc. The following takes the bolt connection dynamics modeling device as an example to illustrate this embodiment and the following embodiments.

[0067] Based on this, an embodiment of the present application provides a method for dynamic modeling of bolt connections. In this embodiment, the method for dynamic modeling of bolt connections is applied to a wind turbine generator set, wherein the wind turbine generator set includes a plurality of connected parts connected by bolts, and the micro-convex bodies with elastic-plastic deformation ability on the joint surfaces of the connected parts are simulated using virtual media. Figure 2 , Figure 2 This is a schematic flow chart of the first embodiment of the bolt connection dynamics modeling method of the present application.

[0068] In this embodiment, the bolt connection dynamics modeling method includes steps S10 to S30:

[0069] Step S10, determining initial parameter information of the connecting surface of the connected parts.

[0070] like Figure 3 As shown, Figure 3 This is a schematic diagram of the microscopic contact of the bolt connection in the first embodiment of the bolt connection dynamics modeling method of the present application. Figure 3 In the example, two connected parts, namely, connected parts A and connected parts B, are taken as examples. Connected parts A and connected parts B can be connected by a number of bolts, and the surfaces of connected parts A and connected parts B that contact each other are the bonding surfaces, namely, the above-mentioned connected parts bonding surfaces. Since the bonding surfaces of the connected parts have a certain surface roughness, namely, there are a large number of micro-convex bodies, the contact of the bonding surfaces of the connected parts is not completely continuous at the microscopic level, but is composed of countless tiny point contacts, which are mainly formed by the contact between the micro-convex bodies on the bonding surfaces of the connected parts. When in contact, each micro-convex body will show stiffness mechanical properties in three orthogonal directions (i.e., the three directions of x, y, and z), and these stiffness properties describe the ability of the micro-convex body to resist deformation in all directions when subjected to external forces. Since the sizes and shapes of the micro-convex bodies are different, their stiffness in different directions may also be different. In order to simplify the analysis, the prior art usually ignores this part, but adopts a binding simplification processing method, which leads to the inaccurate dynamic modeling of the bolt connection in the wind turbine dynamics model, thereby reducing the accuracy of the wind turbine dynamics model.

[0071] like Figure 4 As shown, Figure 4 This is a schematic diagram of the virtual medium equivalent model in the first embodiment of the bolt connection dynamic modeling method of the present application. Although the specific shapes and sizes of each micro-protrusion may be different, they are all formed by the same processing process, material properties, and use environment. In the presence of a large number of micro-protrusions, each micro-protrusion has statistical consistency in mechanical properties. Based on this, a virtual medium equivalent model can be established to simulate the dynamic performance of bolted connections. In the virtual medium equivalent model, the comprehensive effect of all micro-protrusions is simplified and equivalent to a layer of virtual material, namely, the virtual medium. The virtual medium represents the comprehensive effect of a large number of micro-protrusions on the joint surface of the connected parts on a macroscopic scale. Therefore, the complex behaviors of each micro-protrusion during the contact process, such as elastic-plastic deformation and energy dissipation, can be simplified and uniformly processed through the virtual medium.

[0072] It should be noted that the above initial parameter information may be parameters related to the size of the connected parts, the size of the bolts, and the mechanical properties of the joint surface of the connected parts.

[0073] In a specific implementation, the above mechanical characteristic parameters can be input into the bolt connection dynamics modeling device by a technician, or collected by the bolt connection dynamics modeling device through a corresponding collection device.

[0074] Step S20: determining characteristic parameters of the virtual medium according to the initial parameter information, wherein the characteristic parameters correspond to the stiffness characteristics of the joint surface of the connected component.

[0075] It should be noted that the above characteristic parameters may be parameters describing the elastic response of the virtual material when subjected to external forces (ie, the ability to generate and recover deformation), and reflect the ability of the virtual medium to resist deformation.

[0076] In a specific implementation, the above-mentioned bolt connection dynamics equipment can determine the mechanical properties of the joint surfaces of the connected parts according to the initial parameter information, and assign certain characteristic parameters to the virtual material based on the mechanical properties. The characteristic parameters are used to simulate the mechanical response of the joint surfaces of the connected parts when subjected to external forces. The mechanical response includes the ability to resist deformation (stiffness) and the ability to dissipate energy (damping). Therefore, the stiffness characteristics of the joint surfaces of the connected parts can be reflected through the characteristic parameters.

[0077] Step S30: constructing a bolt connection dynamics model using the characteristic parameters.

[0078] In a specific implementation, after determining the characteristic parameters of the virtual medium, the above-mentioned bolt connection dynamics device can collect the corresponding data of the wind turbine generator set to construct a bolt connection dynamics model, so that the wind turbine dynamics model constructed by the bolt connection dynamics model can accurately predict the performance of the wind turbine under different working conditions, such as output power, efficiency, vibration characteristics, etc. Since the characteristic parameters of the virtual medium are used in the process of constructing the bolt connection dynamics model, it can reflect the stiffness characteristics of the joint surface of the connected parts due to vibration, and the model accuracy is relatively high.

[0079] The bolt connection dynamic modeling method provided in this embodiment is applied to a wind turbine generator set, which includes a plurality of connected parts connected by bolts, and the micro-convex bodies with elastic-plastic deformation ability on the joint surface of the connected parts are simulated by virtual media. In this embodiment, the initial parameter information of the joint surface of the connected parts is determined; the characteristic parameters of the virtual medium are determined according to the initial parameter information, and the bolt connection dynamic model is constructed through the characteristic parameters. Since the present embodiment simulates the micro-convex bodies with elastic-plastic deformation ability through the virtual medium, the elastic material of the determined virtual medium corresponds to the stiffness characteristics of the joint surface of the connected parts. Therefore, compared with the prior art that adopts the simplified binding processing method of ignoring the stiffness characteristics, the bolt connection dynamic model established in this embodiment can reflect the stiffness characteristics of the joint surface of the connected parts due to vibration through the elastic material of the virtual medium, making the bolt connection dynamic model more accurate, thereby effectively improving the accuracy of the wind turbine dynamic modeling, and further improving the reliability of simulation-guided optimization.

[0080] Based on the first embodiment of the present application, the second embodiment of the present application is proposed. In the second embodiment of the present application, the same or similar contents as those of the first embodiment can be referred to the above introduction, and will not be repeated later. Figure 5 , Figure 5 This is a schematic flow chart of the second embodiment of the bolt connection dynamics modeling method of the present application.

[0081] In this embodiment, the step of determining the characteristic parameters of the virtual medium according to the initial parameter information may include steps S201 to S205:

[0082] Step S201: determining the mechanical characteristic parameters of the joint surfaces of the connected parts based on the initial parameter information.

[0083] It should be noted that the above-mentioned mechanical characteristic parameters may be parameters characterizing the rigidity and damping characteristics of the joint surface of the connected parts.

[0084] Step S202: determining the physical property parameters of the virtual medium through the mechanical characteristic parameters.

[0085] It should be noted that the above-mentioned physical property parameters may be elastic material parameters describing the physical quantities of the virtual medium, including elastic modulus parameters, shear modulus parameters, Poisson's ratio and density of the virtual medium. The above-mentioned elastic modulus parameters may be physical quantities of the virtual medium's ability to resist elastic deformation when subjected to external forces; the above-mentioned shear modulus parameters may be physical quantities of the virtual medium's ability to resist shear deformation when subjected to shear forces; the above-mentioned Poisson's ratio may be the ratio of the lateral normal strain to the axial normal strain when the virtual medium is subjected to unidirectional tension or compression; the above-mentioned density may be the ratio of the mass of the virtual medium to its volume.

[0086] In a specific implementation, the above-mentioned bolt connection dynamic modeling device can determine the elastic modulus parameters and shear modulus parameters of the virtual medium through the stiffness in the mechanical characteristic parameters, determine the Poisson's ratio of the virtual medium through the gap between each connected part, and determine the density of the virtual medium through the density of each connected part.

[0087] In a feasible implementation, step S202 may include steps S2021 to S2024:

[0088] Step S2021, determining the contact stiffness of the joint surfaces of the connected parts according to the mechanical characteristic parameters.

[0089] It should be noted that the above-mentioned contact stiffness may be a parameter of the ability of the connected parts to resist contact deformation under the action of external forces.

[0090] Step S2022: determining a modulus parameter of the virtual medium according to the contact stiffness.

[0091] In a specific implementation, the modulus parameters may be elastic modulus parameters and shear modulus parameters. The bolt connection dynamics modeling device may determine the contact stiffness of the connected parts in different directions, and infer the elastic modulus parameters and shear modulus parameters of the virtual medium through the contact stiffness.

[0092] Further, in this embodiment, the contact stiffness includes normal compression contact stiffness and shear contact stiffness, the simulation parameters include elastic simulation parameters and shear modulus parameters, and step S2022 may include steps S20221 to S20224:

[0093] Step S20221, determining the normal compressive contact stiffness in the vertical direction of the joint surface of the connected parts according to the mechanical parameters.

[0094] It should be noted that the above-mentioned normal compression contact stiffness may be the ability of the joint surface of the connected parts to resist compression deformation when the two connected parts are compressed in the normal direction.

[0095] Step S20222: determining the shear contact stiffness in a direction parallel to the joint surface of the connected parts according to the mechanical parameters.

[0096] It is understandable that the above-mentioned shear contact stiffness may be the ability of the joint surface of the connected parts to resist shear deformation when subjected to a tangential force (ie, shear force).

[0097] In the specific implementation, the Yoshimura Yoshitaka method can be used to obtain the normal compression contact stiffness and shear contact stiffness. A feasible way is that the above-mentioned bolt connection dynamics modeling device can integrate the equivalent normal stiffness per unit area over the entire connector joint surface to solve the normal contact stiffness in the vertical direction, and integrate the equivalent tangential stiffness per unit area over the entire connector joint surface to solve the shear contact stiffness in the parallel direction.

[0098] In addition, the normal compression contact stiffness and shear contact stiffness can also be determined by contact fractal theory and other methods.

[0099] Step S20223: determining the elastic modulus parameter of the virtual medium based on the normal compression contact stiffness.

[0100] Step S20224: determining the shear modulus parameter of the virtual medium based on the shear contact stiffness.

[0101] In a specific implementation, the basic theory of material mechanics can be combined with specific simulation or experimental data to establish the mathematical relationship between normal compression contact stiffness and elastic modulus parameters and the mathematical relationship between shear contact stiffness and shear modulus parameters, and the corresponding elastic modulus parameters and shear modulus parameters can be inferred by substituting the normal compression contact stiffness and shear contact stiffness. The above data relationships include but are not limited to Hooke's law, contact mechanics equations, etc.

[0102] Step S2023: Determine the density of the virtual medium according to the density of each of the connected components.

[0103] In a specific implementation, the density of the virtual medium can be calculated using the following density formula:

[0104]

[0105] Where ρ is the density of the virtual medium, ρ1 is the density of the connected part A, ρ2 is the density of the connected part B, ν1 is the volume of the connected part A, and ν2 is the volume of the connected part B.

[0106] Among them, the above-mentioned connected part A and the connected part B correspond to Figure 3 The connected parts are shown.

[0107] Step S2024: determining the physical property parameters of the virtual medium through the contact stiffness, the modulus parameter, the density and a preset Poisson's ratio.

[0108] It should be noted that the preset Poisson's ratio may be a preset value. Since there are a large number of gaps between the connected parts, when a small elastic deformation occurs in any direction, the deformation of the irregular micro-convex bodies in other directions is mainly to fill the gaps, so the small deformation in other directions can be ignored, and the Poisson's ratio is set to zero to obtain the preset Poisson's ratio.

[0109] In a specific implementation, the above-mentioned bolt connection dynamics modeling device can obtain the physical property parameters of the virtual medium after determining the contact stiffness, modulus parameters (i.e., elastic modulus parameters and shear modulus parameters), density and preset Poisson's ratio of the virtual medium.

[0110] Step S203: determining current design parameters based on the initial parameter information, wherein the current design parameters include first design parameters corresponding to the connected member and second design parameters corresponding to the bolt.

[0111] It should be noted that the first design parameter can be the currently used connected component (such as Figure 3 The second design parameters may be the design parameters of the bolts currently connecting the connected parts, including the bolt tension and bolt pre-tightening force.

[0112] For ease of understanding, refer to Figure 6 To explain, Figure 6 This is a schematic diagram of the bolt connection dynamics model in the second embodiment of the bolt connection dynamics modeling method of the present application. Figure 6 In the figure, the example of the connected parts A and B connected by two bolts is taken. Through the virtual medium (i.e., the virtual material unit in the figure), a bolt connection dynamic equivalent model consisting of the connected parts A, the connected parts B and the virtual medium can be constructed. In the bolt connection dynamic model, the connected joint surface corresponding to each bolt can be equivalent to a layer of flat cylindrical virtual medium. The diameter D of the virtual medium is affected by design parameters such as the thickness of the connected parts, the friction coefficient of the contact surface, the bolt diameter, and the bolt preload. Different design parameters will result in different diameters D of the virtual material.

[0113] In a specific implementation, the design parameters of the connected parts and bolts may be included in the initial parameter information, and the bolt connection dynamics model may parse the initial parameter information to determine the current design parameters of the connected parts and bolts currently in use.

[0114] Step S204: determining geometric parameters of the virtual medium according to the current design parameters.

[0115] Step S205: determining characteristic parameters of the virtual medium according to the physical property parameters and the geometric parameters.

[0116] It should be noted that the above-mentioned geometric parameters may be parameters describing the size of the virtual medium, including the geometric diameter and thickness of the virtual medium.

[0117] It is understandable that if Figure 6 As shown in the figure, the dynamic equivalent model of bolt connection based on virtual medium can describe the dynamics of virtual medium in different directions (i.e. Figure 6 The anisotropic parameters of the virtual medium in the x, y, and z directions are the elastic modulus parameters, shear modulus parameters, Poisson's ratio, density, and geometric parameters (i.e., geometric diameter and thickness) that describe the virtual medium. The geometric diameter is the surface diameter of the virtual medium in the x and y directions, and the thickness is the height of the virtual medium in the z direction.

[0118] In a specific implementation, the bolt connection dynamics modeling device can establish the corresponding relationship between different design parameters and the geometric parameters of the virtual medium through experiments. After determining the current design parameters, the geometric parameters of the virtual medium corresponding to the current design parameters can be obtained. Among them, the characteristic parameters of the virtual medium can be the physical property parameters and geometric parameters of the virtual medium.

[0119] This embodiment determines the mechanical characteristic parameters of the joint surfaces of the connected parts based on the initial parameter information; determines the physical property parameters of the virtual medium through the mechanical characteristic parameters; determines the current design parameters based on the initial parameter information; determines the geometric parameters of the virtual medium through the current design parameters; determines the characteristic parameters of the virtual medium according to the physical property parameters and the geometric parameters, so as to accurately establish a dynamic equivalent model of the bolt connection, so that the virtual medium can accurately simulate the stiffness characteristics and damping characteristics of the connected joint surfaces, thereby improving the accuracy of the dynamic model of the bolt connection.

[0120] Based on the second embodiment of the present application, the third embodiment of the present application is proposed. In the third embodiment of the present application, the same or similar contents as those of the first embodiment and the second embodiment can be referred to the above introduction, and will not be repeated in the following. Figure 7 To explain, Figure 7 This is a schematic flow chart of the third embodiment of the bolt connection dynamics modeling method of the present application.

[0121] In this embodiment, step S204 may include steps S2041 to S2044:

[0122] Step S2041, obtaining a preset parameter prediction model, wherein the preset parameter prediction model represents a nonlinear mapping relationship between a design parameter and a geometric diameter of the virtual medium.

[0123] In a specific implementation, the above-mentioned bolt connection dynamic model can obtain a large number of design parameters of the used connected parts and bolts, as well as the geometric diameters of the virtual medium corresponding to different design parameters. The model is trained by constructing training data through the obtained design parameters and geometric diameters, and a preset parameter prediction model that characterizes the nonlinear mapping relationship between the design parameters and the geometric diameter of the virtual medium is obtained. The preset parameter prediction model can feedback the geometric diameter of the corresponding virtual medium based on the input design parameters.

[0124] In a feasible implementation manner, before the step of obtaining the preset size prediction model, steps S2041A to S2041E are also included:

[0125] Step S2041A, obtaining design parameters corresponding to different connected parts and different bolts.

[0126] In a specific implementation, the bolt connection dynamics modeling device can obtain first design parameters of a large number of connected parts and second design parameters corresponding to the bolts connected.

[0127] Step S2041B: selecting sample points from the design parameters.

[0128] In the specific implementation, based on the idea of ​​describing global characteristics with sample characteristics, sample points that can represent the overall characteristics of the design parameters can be selected from each design parameter through experimental design (such as orthogonal experimental design, optimal Latin hypercube experimental design, etc.), so as to significantly improve the representativeness of the design parameters and provide strong support for subsequent data analysis and model building.

[0129] like Figure 8 As shown, Figure 8 Schematic diagram of the experimental design sample points in the third embodiment of the bolt connection dynamics modeling method of the present application. Figure 8 This is just an example and is not intended to limit the present solution. Figure 8 In the design, the thickness of the connected parts, the friction coefficient of the contact surface, the bolt diameter, and the bolt preload can be used as design parameters, the size parameter (i.e., the size of any design parameter) can be used as the horizontal coordinate, and the spacing parameter can be used as the vertical coordinate, that is, the size can be adjusted at different spacings. Then, the design sample points can be determined through experimental design, that is, representative sample points can be selected from the design parameters.

[0130] It should be noted that the above-mentioned orthogonal experimental design can be used to arrange experiments using an orthogonal table, and the optimal level combination of each factor can be found through a small number of experiments, which can ensure that different levels of each design parameter appear evenly in the experiment and there are comprehensive combination opportunities between any two design parameters.

[0131] It is understandable that the above optimal Latin hypercube experimental design can select sample points by over-optimization criteria (such as maximizing the minimum distance), so that the sample points are more evenly distributed in the design space, thereby improving the prediction accuracy and robustness of the model.

[0132] Step S2041C: determining the bolt influence area diameter under different design parameters according to the sample points.

[0133] Step S2041D: constructing a bolt connection simulation data set according to the diameter of each bolt influence area.

[0134] It should be noted that, under different design parameters, the diameter of the area affected by the bolt on the joint surface of the connected parts is different, and the diameter of the area affected can be the geometric diameter of the virtual medium.

[0135] In a specific implementation, the bolt connection dynamics modeling device can obtain the bolt influence area diameter corresponding to different sample points, set the influence area diameter, that is, the geometric diameter of the virtual medium, to the same data set to construct a bolt connection simulation data set.

[0136] Step S2041E: Model training is performed using the sample points and the bolt connection simulation data set to obtain a preset size prediction model that characterizes a nonlinear mapping relationship between design parameters and a geometric diameter of the virtual medium.

[0137] In a specific implementation, the above-mentioned bolt connection dynamic modeling device can use sample points as model input and the bolt connection simulation data set as model output to construct training samples, and iteratively train the initial model (such as a deep neural network model, a machine learning model or other model) through the training samples to obtain a preset size prediction model that characterizes the nonlinear mapping relationship between the design parameters and the geometric diameter of the virtual medium.

[0138] In addition, during the model training process, if the model used is a deep learning network model, the error between the geometric diameter prediction value fed back by the model and the actual geometric diameter can be determined, and the error can be back-propagated through the gradient descent algorithm to adjust the weights and biases between the hidden layers in the model, thereby reducing the model error and improving the model accuracy.

[0139] Step S2042: predicting the current geometric diameter of the virtual medium corresponding to the current design parameters by using the preset size prediction model.

[0140] In a specific implementation, after the predicted size prediction model is trained, the above-mentioned bolt connection dynamics modeling device can input the current design parameters into the predicted size prediction model, and the predicted size prediction model predicts the current geometric diameter of the virtual medium corresponding to the current design parameters.

[0141] Step S2043, obtaining a preset thickness of the virtual medium.

[0142] Step S2044: determining the geometric parameters of the virtual medium according to the current geometric diameter and the preset thickness.

[0143] In a specific implementation, the thickness of the virtual medium should satisfy the thickness of the upper and lower connected parts (such as Figure 3 The deformation of the connected parts A and B in the figure should be coordinated, that is, each connected part has the same displacement. At the same time, the thickness of the virtual medium should not be too different from the dimensions in other directions, which will lead to an ill-conditioned equation when solving the thickness. Based on this, the thickness of the virtual medium of the diameter part can be set to a preset value, such as 1mm, to obtain the preset thickness.

[0144] The geometric parameters of the virtual medium include a current geometric diameter and a preset thickness. Therefore, after the current geometric diameter and the preset thickness are determined, the current geometric diameter and the preset thickness can be used as the geometric parameters of the virtual medium.

[0145] This embodiment constructs a preset size prediction model by selecting sample points from the design parameters. The preset size prediction model predicts the current geometric diameter of the virtual medium corresponding to the current design parameters, and determines the geometric parameters of the virtual medium through the current geometric diameter and the preset thickness, thereby effectively improving the degree of automation in constructing the dynamic equivalent model of the bolt connection corresponding to the virtual medium, thereby improving the efficiency of constructing the dynamic model of the bolt connection. The invention is simple to use and has a wide range of applications.

[0146] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the bolt connection dynamic modeling method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0147] This application also provides a bolt connection dynamics modeling device, please refer to Fig. 9 , Fig. 9 This is a schematic diagram of the module structure of the bolt connection dynamics modeling device of this application.

[0148] like Fig. 9 As shown, the bolt connection dynamics modeling device includes:

[0149] The information determination module 10 is used to determine the initial parameter information of the joint surface of the connected parts.

[0150] The virtual medium module 20 is used to determine characteristic parameters of the virtual medium according to the initial parameter information, wherein the characteristic parameters correspond to the stiffness characteristics of the joint surface of the connected component.

[0151] The model building module 30 is used to build a bolt connection dynamics model through the characteristic parameters.

[0152] The bolt connection dynamics modeling device provided by the present application adopts the bolt connection dynamics modeling method in the above embodiment, which can solve the technical problem that the prior art will reduce the accuracy of bolt connection dynamics modeling to a certain extent, thereby reducing the accuracy of the fan dynamics model, resulting in low reliability of simulation guidance optimization. Compared with the prior art, the beneficial effects of the bolt connection dynamics modeling device provided by the present application are the same as the beneficial effects of the bolt connection dynamics modeling method provided by the above embodiment, and the other technical features in the bolt connection dynamics modeling device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0153] The present application provides a bolt connection dynamics modeling device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the bolt connection dynamics modeling method in the above-mentioned embodiment one.

[0154] Reference below Fig.10 , Fig.10 The schematic diagram of the device structure of the hardware operating environment involved in the bolt connection dynamics modeling method in the embodiment of the present application shows a schematic diagram of the structure of the bolt connection dynamics modeling device suitable for implementing the embodiment of the present application. The xxx device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Fig.10 The xxx device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0155] like Fig.10As shown, the bolt connection dynamics modeling device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM: Read Only Memory) 1002 or the program loaded from the storage device 1003 to the random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the xxx device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the bolt connection dynamics modeling device to communicate wirelessly or wired with other devices to exchange data. Although the bolt connection dynamics modeling device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or provided alternatively.

[0156] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0157] The bolt connection dynamics modeling device provided by the present application adopts the bolt connection dynamics modeling method in the above embodiment, which can solve the technical problem that the accuracy of the bolt connection dynamics modeling is reduced to a certain extent, thereby reducing the accuracy of the fan dynamics model, resulting in low reliability of simulation guidance optimization. Compared with the prior art, the beneficial effects of the bolt connection dynamics modeling device provided by the present application are the same as the beneficial effects of the bolt connection dynamics modeling method provided by the above embodiment, and the other technical features in the bolt connection dynamics modeling device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0158] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0159] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0160] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the bolt connection dynamics modeling method in the above-mentioned embodiment.

[0161] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0162] The computer-readable storage medium may be included in the bolt connection dynamics modeling device; or may exist independently without being assembled into the bolt connection dynamics modeling device.

[0163] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the bolt connection dynamics modeling device, the bolt connection dynamics modeling device: determines the initial parameter information of the joint surface of the connected parts; determines the characteristic parameters of the virtual medium according to the initial parameter information, and the characteristic parameters correspond to the stiffness characteristics of the joint surface of the connected parts; and constructs the bolt connection dynamics model through the characteristic parameters.

[0164] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0165] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0166] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0167] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned bolt connection dynamic modeling method, and can solve the technical problem that the accuracy of bolt connection dynamic modeling is reduced to a certain extent, thereby reducing the accuracy of the fan dynamic model, resulting in low reliability of simulation-guided optimization. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the bolt connection dynamic modeling method provided in the above-mentioned embodiment, and will not be repeated here.

[0168] The present application also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps of the bolt connection dynamics modeling method as described above are implemented.

[0169] The computer program product provided by the present application can solve the technical problem that the accuracy of the bolt connection dynamic modeling is reduced to a certain extent, thereby reducing the accuracy of the fan dynamic model, resulting in low reliability of simulation-guided optimization. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the bolt connection dynamic modeling method provided by the above embodiment, and will not be elaborated here.

[0170] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for dynamic modeling of bolt connection, characterized in that: The method is applied to a wind turbine generator set, wherein the wind turbine generator set includes a plurality of connected parts connected by bolts, and micro-convex bodies with elastic-plastic deformation ability on the joint surfaces of the connected parts are simulated using virtual media, and the method includes: Determining initial parameter information of the joint surface of the connected parts; Determining characteristic parameters of the virtual medium according to the initial parameter information, wherein the characteristic parameters correspond to the stiffness characteristics of the joint surface of the connected component; A bolt connection dynamics model is constructed using the characteristic parameters.

2. The bolt connection dynamics modeling method according to claim 1, characterized in that: The step of determining the characteristic parameters of the virtual medium according to the initial parameter information comprises: Determining the mechanical characteristic parameters of the joint surface of the connected parts based on the initial parameter information; Determining the physical property parameters of the virtual medium through the mechanical characteristic parameters; Determine current design parameters based on the initial parameter information, wherein the current design parameters include first design parameters corresponding to the connected member and second design parameters corresponding to the bolt; Determining geometric parameters of the virtual medium using the current design parameters; The characteristic parameters of the virtual medium are determined according to the physical property parameters and the geometric parameters.

3. The bolt connection dynamics modeling method according to claim 2, characterized in that: The step of determining the physical property parameters of the virtual medium by using the mechanical characteristic parameters comprises: Determining the contact stiffness of the joint surface of the connected parts according to the mechanical characteristic parameters; Determining a modulus parameter of the virtual medium according to the contact stiffness; Determining the density of the virtual medium according to the density of each of the connected components; The physical property parameters of the virtual medium are determined by the contact stiffness, the modulus parameter, the density and a preset Poisson's ratio.

4. The bolt connection dynamics modeling method according to claim 3, characterized in that: The contact stiffness includes normal compression contact stiffness and shear contact stiffness, the simulation parameters include elastic simulation parameters and shear modulus parameters, and the step of determining the modulus parameters of the virtual medium according to the contact stiffness includes: Determining the normal compressive contact stiffness in the vertical direction of the joint surface of the connected parts according to the mechanical parameters; Determine the shear contact stiffness in a direction parallel to the joint surface of the connected parts according to the mechanical parameters; determining the elastic modulus parameter of the virtual medium based on the normal compressive contact stiffness; The shear modulus parameter of the virtual medium is determined based on the shear contact stiffness.

5. The bolt connection dynamics modeling method according to claim 2, characterized in that: The step of determining the geometric parameters of the virtual medium by using the current design parameters comprises: Acquire a preset parameter prediction model, wherein the preset parameter prediction model represents a nonlinear mapping relationship between a design parameter and a geometric diameter of the virtual medium; Predicting a current geometric diameter of the virtual medium corresponding to the current design parameters by using the preset size prediction model; Obtaining a preset thickness of the virtual medium; The geometric parameters of the virtual medium are determined according to the current geometric diameter and the preset thickness.

6. The bolt connection dynamics modeling method according to claim 5, characterized in that: Before the step of obtaining the preset size prediction model, the method further includes: Obtain design parameters corresponding to different connected parts and different bolts; Selecting sample points from the design parameters; Determine the bolt influence area diameter under different design parameters according to the sample points; Constructing a bolt connection simulation data set according to the diameter of each bolt influence area; Model training is performed through the sample points and the bolt connection simulation data set to obtain a preset size prediction model that characterizes the nonlinear mapping relationship between the design parameters and the geometric diameter of the virtual medium.

7. A bolt connection dynamics modeling device, characterized in that: The device comprises: An information determination module, used to determine initial parameter information of the joint surface of the connected parts; A virtual medium module, used to determine characteristic parameters of a virtual medium according to the initial parameter information, wherein the characteristic parameters correspond to the stiffness characteristics of the joint surface of the connected member; The model building module is used to build a bolt connection dynamic model through the characteristic parameters.

8. A bolt connection dynamics modeling device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the bolt connection dynamics modeling method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the bolt connection dynamics modeling method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the method for dynamic modeling of a bolt connection according to any one of claims 1 to 6 are implemented.

Images