A method, device and equipment for determining the pressing amount of a bearing end cover of a wind turbine generator system and a storage medium

Abstract

This application discloses a method, apparatus, equipment, and storage medium for determining the bearing end cover clamping amount of a wind turbine generator set, relating to the wind power field. The method includes: determining various operating conditions of the target wind turbine generator set; determining the ultimate load and equivalent fatigue load based on the operating conditions; determining the preload of each bearing; using a dynamic transmission chain model to determine the bearing life corresponding to each bearing preload to obtain a first target relationship and a second target relationship; the first target relationship is the relationship between bearing life and operating clearance, and the second target relationship is the relationship between operating clearance and bearing preload; determining a third target relationship based on a static transmission chain model; determining the target end cover clamping amount based on the ultimate load and equivalent fatigue load; the third target relationship is the relationship between bearing preload and end cover clamping amount; and determining the final end cover clamping amount based on the third target relationship, the first target relationship, and the second target relationship. This application ensures that the calculated end cover clamping amount is applicable to wind turbine generator bearings.

Description

Technical Field

[0001] This invention relates to the field of wind power, and in particular to a method, apparatus, equipment and storage medium for determining the bearing end cover clamping amount of a wind turbine generator set. Background Technology

[0002] With the trend towards larger wind turbine units, the span of the drivetrain system is increasing, making the use of O-type single-row tapered roller bearings a preferred solution. Ensuring correct bearing installation to guarantee the unit reaches its design life of 20 to 25 years, thereby avoiding power generation losses and on-site replacement costs due to premature failure, is of paramount importance. Currently, the calculation methods for the clamping amount in wind turbine double tapered roller bearing arrangements only consider the pre-tightening process in the design calculations, resulting in low efficiency of the finite element modeling method used in the calculations. The use of solid rollers and poor calculation convergence lead to premature failure of the wind turbine drive system, lacking accurate guidance for the practical application of wind turbine bearings.

[0003] In summary, ensuring that the calculated clamping amount is applicable to wind turbine bearings to reduce the impact on the service life of the wind turbine drive system is a problem that urgently needs to be solved. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method, apparatus, equipment, and storage medium for determining the bearing end cover clamping amount of a wind turbine generator set, which can ensure that the calculated clamping amount is applicable to the wind turbine generator set bearings to reduce the impact on the service life of the wind turbine transmission system. The specific solution is as follows:

[0005] In a first aspect, this application discloses a method for determining the clamping amount of the bearing end cover of a wind turbine generator set, including:

[0006] Determine the operating conditions of the target wind turbine under the specified design standards, determine the time-series load and ultimate load of the target wind turbine based on the operating conditions, and process the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load of a preset number of target turbines.

[0007] The preload of each bearing is determined based on a preset preload setting method, and the bearing life of the target bearing of the target wind turbine corresponding to each bearing preload is determined using the dynamic transmission chain model of the target wind turbine, so as to obtain a first target relationship and a second target relationship; the first target relationship is the relationship between the bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance and the bearing preload.

[0008] The third target relationship of the target wind turbine is determined based on the static transmission chain model of the target wind turbine, and the target end cap clamping amount is determined based on the ultimate load and the equivalent fatigue load; the third target relationship is the relationship between the bearing preload and the end cap clamping amount.

[0009] Based on the third target relationship, the target bearing preload corresponding to the target end cap clamping amount is determined, and based on the first target relationship and the second target relationship, the target bearing life corresponding to the target bearing preload is determined, so as to determine whether the target bearing life meets the preset bearing life condition, and when the target bearing life meets the preset bearing life condition, the target end cap clamping amount is determined as the final end cap clamping amount.

[0010] Optionally, the step of determining the time-series load and ultimate load of the target wind turbine based on the operating conditions, and processing the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load of a preset target number of turbines, includes:

[0011] Based on the operating conditions, determine the wind turbine torque, wind turbine bending moment, time-series load, ultimate load, and duration distribution of each operating condition of the target wind turbine in the stationary coordinate system at the hub center.

[0012] The time-series load is equivalently segmented based on the wind turbine torque, the wind turbine bending moment, the time-series load, and the duration distribution of each operating condition to determine the equivalent fatigue load of a preset target number of groups.

[0013] Optionally, before determining the bearing life of the target bearing of the target wind turbine corresponding to the preload of each bearing using the dynamic transmission chain model corresponding to the target wind turbine, the method further includes:

[0014] The dynamic transmission chain model is established using a pre-defined first boundary condition. The dynamic transmission chain model includes a hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, front and rear end covers, and gearbox interface. The first boundary condition is a boundary condition constructed based on equivalent fatigue load, transmission chain gravity load, and tower degrees of freedom.

[0015] Optionally, determining the bearing life of the target bearing of the target wind turbine corresponding to the preload of each bearing using the dynamic transmission chain model corresponding to the target wind turbine, in order to obtain the first target relationship and the second target relationship, includes:

[0016] The life index of the single-row tapered roller bearing of the target wind turbine is determined by using the dynamic transmission chain model corresponding to the preload of each bearing, and the bearing life is determined based on the life index to obtain the first target relationship and the second target relationship.

[0017] Optionally, before determining the third target relationship of the target wind turbine based on the static transmission chain model of the target wind turbine, the method further includes:

[0018] The static transmission chain model is established using pre-defined second boundary conditions and temperature boundary conditions. The static transmission chain model is spatially discretized, and the material properties of the static transmission chain model are set based on the material properties of the target wind turbine.

[0019] The static transmission chain model includes a hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, gearbox interface, bolts, and pins. The second boundary condition of the static transmission chain model is a boundary condition constructed based on all degrees of freedom of the main shaft and hub mounting surface, the preload of the rear end cover locking bolts and the preload of the gear ring bolts and the connecting bolts between the planetary carrier and the main shaft.

[0020] Optionally, determining the target end cap clamping amount based on the ultimate load and the equivalent fatigue load includes:

[0021] Remove all constraints on the spindle and hub mounting surfaces, and constrain the tower's degrees of freedom;

[0022] Gravity is applied to the static transmission chain model based on the actual center of gravity of the transmission chain of the target wind turbine, and the equivalent fatigue load is applied at the center of the hub to obtain the first axial contact information.

[0023] The equivalent fatigue load applied to the center of the hub is changed to the ultimate load to obtain the second axial contact information;

[0024] The target end cap clamping amount is determined based on the first axial contact information and the second axial contact information.

[0025] Optionally, determining the target end cap clamping amount based on the first axial contact information and the second axial contact information includes:

[0026] Based on the first axial contact information and the second axial contact information, determine whether the target area ratio corresponding to the current end cap clamping amount is less than the preset area ratio.

[0027] If the target area ratio is smaller than the preset area ratio, the end cap clamping amount is increased to obtain a new end cap clamping amount, and the process jumps to the step of establishing the static transmission chain model using the preset second boundary conditions and temperature boundary conditions.

[0028] The target area ratio is the ratio of the effective contact pressure area to the preset contact area, and the effective contact pressure area is the area where the contact pressure is greater than the preset contact pressure.

[0029] Secondly, this application discloses a device for determining the bearing end cover clamping amount of a wind turbine generator set, comprising:

[0030] The load processing module is used to determine the operating conditions of the target wind turbine under the specified design standards, determine the time-series load and ultimate load of the target wind turbine based on the operating conditions, and process the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load of a preset number of target turbines.

[0031] The target relationship determination module is used to determine the preload of each bearing based on a preset preload setting method, and to determine the bearing life of the target bearing of the target wind turbine corresponding to each bearing preload using the dynamic transmission chain model of the target wind turbine, so as to obtain a first target relationship and a second target relationship; the first target relationship is the relationship between the bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance and the bearing preload;

[0032] The target clamping amount determination module is used to determine the third target relationship of the target wind turbine based on the static transmission chain model of the target wind turbine, and to determine the target end cap clamping amount based on the ultimate load and the equivalent fatigue load; the third target relationship is the relationship between the bearing preload and the end cap clamping amount;

[0033] The final clamping amount determination module is used to determine the target bearing preload corresponding to the target end cap clamping amount based on the third target relationship, and to determine the target bearing life corresponding to the target bearing preload based on the first target relationship and the second target relationship, so as to determine whether the target bearing life meets the preset bearing life condition, and to determine the target end cap clamping amount as the final end cap clamping amount when the target bearing life meets the preset bearing life condition.

[0034] Thirdly, this application discloses an electronic device, comprising:

[0035] Memory, used to store computer programs;

[0036] A processor is used to execute the computer program to implement the aforementioned method for determining the bearing end cover clamping amount of a wind turbine generator set.

[0037] Fourthly, this application discloses a computer-readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the aforementioned method for determining the bearing end cover clamping amount of a wind turbine generator set.

[0038] In this application, when determining shaft preload, the operating conditions of the target wind turbine under specified design standards are determined. Based on these operating conditions, the sequential load and ultimate load of the target wind turbine are determined. The sequential load is then processed based on the duration distribution of each operating condition to determine the equivalent fatigue load for a preset target number of wind turbines. The preload of each bearing is determined based on a preset preload setting method. The bearing life of the target bearing corresponding to each bearing preload is determined using the dynamic transmission chain model of the target wind turbine, thus obtaining a first target relationship and a second target relationship. The first target relationship is the relationship between the bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance. The relationship between the bearing preload and the end cap clamping amount is determined based on the static transmission chain model of the target wind turbine, and the target end cap clamping amount is determined based on the ultimate load and the equivalent fatigue load. The third target relationship is the relationship between the bearing preload and the end cap clamping amount. The target bearing preload corresponding to the target end cap clamping amount is determined based on the third target relationship, and the target bearing life corresponding to the target bearing preload is determined based on the first target relationship and the second target relationship. It is then determined whether the target bearing life meets the preset bearing life condition, and the target end cap clamping amount is determined as the final end cap clamping amount when the target bearing life meets the preset bearing life condition. As can be seen, this application obtains the equivalent fatigue load by processing the time-series load of the target wind turbine under the specified design standards, determines the first and second target relationships using the dynamic transmission chain model of the target wind turbine, and determines the third target relationship using the static transmission chain model. This allows the target end cap clamping amount to be determined using the previously obtained equivalent fatigue load and ultimate load. Based on the third target relationship, the target bearing preload corresponding to the target end cap clamping amount is determined. Then, based on the second target relationship, the operating clearance corresponding to the target bearing preload is determined, and based on the first target relationship, the bearing life corresponding to the operating clearance is determined, which is also the target bearing life corresponding to the target end cap clamping amount. Finally, when the target bearing life reaches the expected bearing life, the target end cap clamping amount is determined as the final end cap clamping amount, thus ensuring that the calculation results of the clamping amount are applicable to the wind turbine bearings and reducing the impact on the service life of the wind turbine transmission system. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0040] Figure 1 This application discloses a flowchart of a method for determining the bearing end cover clamping amount of a wind turbine generator set.

[0041] Figure 2 This is a schematic flowchart of a method for determining the bearing end cover clamping amount of a wind turbine generator set disclosed in this application.

[0042] Figure 3 This application provides a schematic diagram of a stationary coordinate system at the center of a wheel hub.

[0043] Figure 4 This is a schematic diagram illustrating the relationship between bearing preload and end cap clamping amount disclosed in this application.

[0044] Figure 5 This is a schematic diagram of a target area when the proportion of the target area disclosed in this application is smaller than the preset proportion of the target area;

[0045] Figure 6 This is a schematic diagram of a target area when the proportion of the target area disclosed in this application is greater than the preset proportion of the target area;

[0046] Figure 7 This is a schematic diagram of a bearing end cover clamping amount determination device for a wind turbine generator set disclosed in this application.

[0047] Figure 8 This is a structural diagram of an electronic device disclosed in this application. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Current methods for calculating the clamping amount in double tapered roller bearing arrangements for wind turbines suffer from low efficiency due to the finite element modeling method used in the calculations, which only considers the pre-tightening process. Furthermore, the use of solid rollers and poor convergence in the calculations lead to premature failure of the wind turbine drive system, lacking accurate guidance for practical applications of wind turbine bearings. To address these issues, this application discloses a method for determining the clamping amount of bearing end caps in wind turbine generator sets. This method ensures that the calculated clamping amount is applicable to wind turbine bearings, reducing the impact on the service life of the wind turbine drive system.

[0050] See Figure 1 As shown in the figure, an embodiment of the present invention discloses a method for determining the bearing end cover clamping amount of a wind turbine generator set, including:

[0051] Step S11: Determine the operating conditions of the target wind turbine under the specified design standards, determine the time-series load and ultimate load of the target wind turbine based on the operating conditions, and process the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load of the preset target group number.

[0052] In this embodiment, as Figure 2 As shown, the first step is to process the wind turbine operating load. Specifically, this involves determining the operating conditions of the target wind turbine under specified design standards. Based on these operating conditions, the time-series load and ultimate load of the target wind turbine are determined. The time-series load is then processed based on the duration distribution of the operating conditions to obtain the equivalent fatigue load for the preset number of target turbines. The specific process may include: using wind turbine dynamics simulation software to calculate the operating conditions of the target wind turbine under specified design standards (such as IEC61400-1, the wind power design standard published by the International Electrotechnical Commission), thereby obtaining the equivalent fatigue load for the target turbine. Figure 3 The diagram shows the distribution of wind turbine torque, bending moment, time-series loads, and duration of various operating conditions in a stationary coordinate system at the hub center. Based on this distribution, the time-series loads are equivalently segmented to determine a preset target number of equivalent fatigue load groups, where the preset target number is not less than 300. Simultaneously, extreme values ​​are extracted from the time-series loads, specifically the maximum and minimum values ​​of My, Mz, Myz and Fx, Fy, Fz, Fyz during the operation of the target wind turbine, as well as the values ​​of other mechanical components at that moment.

[0053] Step S12: Determine the preload of each bearing based on the preset preload setting method, and determine the bearing life of the target bearing of the target wind turbine corresponding to each bearing preload using the dynamic transmission chain model of the target wind turbine, so as to obtain the first target relationship and the second target relationship; the first target relationship is the relationship between the bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance and the bearing preload.

[0054] In this embodiment, before determining the bearing life of the target bearings of the target wind turbine corresponding to the preload of each bearing using the dynamic transmission chain model corresponding to the target wind turbine, it is necessary to establish a dynamic transmission chain model using pre-set first boundary conditions. The dynamic transmission chain model includes the hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, front and rear end covers, and gearbox interface. The first boundary conditions are based on equivalent fatigue load, transmission chain gravity load, and the tower's degrees of freedom. The process of building the dynamic transmission chain model can be performed using dynamic analysis software. In one specific implementation, the equivalent fatigue load will be used as the wind load at the hub center, and all degrees of freedom at the tower end will be constrained.

[0055] In this embodiment, after determining different bearing preloads based on a preset preload setting method, the bearing life of the target bearings of the target wind turbine corresponding to each bearing preload is determined using the dynamic transmission chain model corresponding to the target wind turbine, to obtain a first target relationship and a second target relationship. Specifically, this may include: determining the life index (i.e., L10 life, the number of revolutions or hours that 90% of a group of bearings with the same appearance will complete or exceed before expected fatigue) of the single-row tapered roller bearings of the target wind turbine corresponding to each bearing preload using the dynamic transmission chain model corresponding to the target wind turbine. These single-row tapered roller bearings are the bearings on the main shaft of the target wind turbine, and the bearing life is determined based on the life index to obtain the first target relationship and the second target relationship. Since the first target relationship is the relationship between bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance and the bearing preload, a relationship between bearing life and bearing preload can be established based on the first and second target relationships.

[0056] Step S13: Determine the third target relationship of the target wind turbine based on the static transmission chain model of the target wind turbine, and determine the target end cap clamping amount based on the ultimate load and the equivalent fatigue load; the third target relationship is the relationship between the bearing preload and the end cap clamping amount.

[0057] In this embodiment, determining the third target relationship of the target wind turbine based on its static transmission chain model requires establishing the static transmission chain model using pre-defined second boundary conditions and temperature boundary conditions. The static transmission chain model is then spatially discretized, and its material properties are set based on the material properties of the target wind turbine. The static transmission chain model includes a hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, gearbox interface, bolts, and pins. The single-row tapered roller bearing is the bearing on the main shaft of the target wind turbine. The second boundary conditions of the static transmission chain model are constructed based on all degrees of freedom of the main shaft and hub mounting surface, the preload of the rear end cover locking bolts, the preload of the gear ring bolts, and the preload of the planetary carrier and main shaft connecting bolts. The process of building the static transmission chain model can be performed using finite element method analysis software. When spatially discretizing the static transmission chain model, the model is spatially discretized according to the actual calculation accuracy and computer hardware performance. In the spatial discretization, the inner and outer rings of the bearing and the surrounding contact parts are volume-divided. The number of spatial discretization nodes is consistent in the axial and circumferential directions. The material properties include the actual material density, Poisson's ratio, Young's modulus, coefficient of thermal expansion, etc. The temperature boundary conditions are determined based on the temperature of the bearing and the surrounding structure.

[0058] In one specific implementation, the bearing rollers in the static transmission chain model are simplified to spring elements, and the roller stiffness calculation method refers to ISO 16281; the contact between the bearing and the surrounding structure is hard contact, the interference fit is set according to the design value, and the friction coefficient is taken according to the actual bearing material and the surrounding structure material; the bolt modeling method refers to VDI 2230; the initial interference fit between the bearing and the surrounding structure is calculated according to the design assembly dimensions, and the interference friction contact is established in the finite element model. The interference fit is calculated based on the width variation coefficients K1 (front bearing inner ring - spindle), K2 (rear bearing inner ring - spindle), K3 (front bearing outer ring - bearing housing), and K4 (rear bearing outer ring - bearing housing). Multiplying the initial interference fit by the corresponding width variation coefficients at each position yields the predicted displacement of the rear bearing inner ring. The clearance between the inner ring of the rear bearing and the locking end cover is set to... , The variable to be calculated is the end cap clamping amount. The initial interference fit of the surrounding structure can be calculated and verified based on the upper and lower limits of the actual machining error.

[0059] After establishing a static transmission chain model using the second boundary condition, the relative displacements of the inner and outer rings of the front and rear bearings can be extracted based on this model and denoted as Y1 and Y2 respectively. This yields the third objective relationship, namely the relationship between the bearing preload and the end cap clamping amount. Figure 4As shown. The target end cap clamping amount can then be determined based on the ultimate load and equivalent fatigue load. Specifically, this can include: removing constraints on all degrees of freedom of the main shaft and hub mounting surface, and constraining the degrees of freedom of the tower; applying gravity to the static transmission chain model based on the actual center of gravity of the target wind turbine's transmission chain, and applying an equivalent fatigue load at the hub center to obtain first axial contact information; changing the equivalent fatigue load applied to the hub center to the ultimate load to obtain second axial contact information; and determining the target end cap clamping amount based on the first and second axial contact information. Here, the axial contact information refers to the axial contact information between the bearing and the main shaft, and the end cap bearing housing.

[0060] In this embodiment, determining the target end cap clamping amount based on the first axial contact information and the second axial contact information can specifically include: determining whether the target area ratio corresponding to the current end cap clamping amount is less than a preset area ratio based on the first axial contact information and the second axial contact information; if the target area ratio is less than the preset area ratio, increasing the end cap clamping amount to obtain a new end cap clamping amount, and then proceeding to the step of establishing a static transmission chain model using preset second boundary conditions and temperature boundary conditions; wherein, the target area ratio is the ratio of the effective contact pressure area to the preset contact area, and the effective contact pressure area is the area where the contact pressure is greater than the preset contact pressure, such as when the contact pressure is greater than 10000Pa, the area can be determined as the effective contact pressure area. Figure 5 This refers to a situation where the proportion of the target area is not less than the preset proportion of the target area. Figure 6 This refers to a situation where the proportion of the target area is less than the proportion of the preset area.

[0061] Step S14: Determine the target bearing preload corresponding to the target end cap clamping amount based on the third target relationship, and determine the target bearing life corresponding to the target bearing preload based on the first target relationship and the second target relationship, so as to determine whether the target bearing life meets the preset bearing life condition, and determine the target end cap clamping amount as the final end cap clamping amount when the target bearing life meets the preset bearing life condition.

[0062] In this embodiment, since the first target relationship is the relationship between operating clearance and bearing life, the second target relationship is the relationship between bearing preload and operating clearance, and the third target relationship is the relationship between end cap clamping amount and bearing preload, after determining the target end cap clamping amount, the target bearing preload corresponding to the target end cap clamping amount can be determined based on the third target relationship. Then, the target operating clearance corresponding to the target bearing preload is determined using the second target relationship, and finally, the target bearing life corresponding to the target operating clearance is determined using the first target relationship. Thus, the target bearing life corresponding to the target end cap clamping amount is determined, and then it can be determined whether the target bearing life meets the preset bearing life condition. If the target bearing life does not meet the preset bearing life condition, a new target end cap clamping amount needs to be determined, and it needs to be determined whether the bearing life corresponding to the new target end cap clamping amount meets the preset bearing life condition. If the target bearing life meets the preset bearing life condition, the target end cap clamping amount can be determined as the final end cap clamping amount.

[0063] Understandably, if the bearing on the main shaft is a double-row tapered roller bearing, the dynamic transmission chain model and the static transmission chain model should also be adjusted accordingly. The first objective relationship is the relationship between the bearing life and the bearing preload corresponding to the life index of the double-row tapered roller bearing. In other words, due to the different specific structures of actual wind turbine units, the dynamic transmission chain model and the static transmission chain model will be different. Correspondingly, the specific parameters of the first objective relationship, the second objective relationship, and the third objective relationship will also change due to the difference in the dynamic transmission chain model and the static transmission chain model. However, since the independent and dependent variables of each objective relationship have not changed, the final end cover clamping amount suitable for the target wind turbine unit can still be determined based on the first objective relationship, the second objective relationship, and the third objective relationship.

[0064] As can be seen, this application obtains the equivalent fatigue load by processing the time-series load of the target wind turbine under the specified design standards, determines the first and second target relationships using the dynamic transmission chain model of the target wind turbine, and determines the third target relationship using the static transmission chain model. This allows the target end cap clamping amount to be determined using the previously obtained equivalent fatigue load and ultimate load. Based on the third target relationship, the target bearing preload corresponding to the target end cap clamping amount is determined. Then, based on the second target relationship, the operating clearance corresponding to the target bearing preload is determined, and based on the first target relationship, the bearing life corresponding to the operating clearance is determined, which is also the target bearing life corresponding to the target end cap clamping amount. Finally, when the target bearing life reaches the expected bearing life, the target end cap clamping amount is determined as the final end cap clamping amount, thus ensuring that the calculation results of the clamping amount are applicable to the wind turbine bearings and reducing the impact on the service life of the wind turbine transmission system.

[0065] See Figure 7As shown, this application discloses a device for determining the bearing end cover clamping amount of a wind turbine generator set, comprising:

[0066] The load processing module 11 is used to determine the operating conditions of the target wind turbine under the specified design standards, determine the time-series load and ultimate load of the target wind turbine based on the operating conditions, and process the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load of a preset target group.

[0067] The target relationship determination module 12 is used to determine the preload of each bearing based on a preset preload setting method, and to determine the bearing life of the target bearing of the target wind turbine corresponding to each bearing preload using the dynamic transmission chain model of the target wind turbine, so as to obtain a first target relationship and a second target relationship; the first target relationship is the relationship between the bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance and the bearing preload;

[0068] The target clamping amount determination module 13 is used to determine the third target relationship of the target wind turbine based on the static transmission chain model of the target wind turbine, and to determine the target end cap clamping amount based on the ultimate load and the equivalent fatigue load; the third target relationship is the relationship between the bearing preload and the end cap clamping amount;

[0069] The final clamping amount determination module 14 is used to determine the target bearing preload corresponding to the target end cap clamping amount based on the third target relationship, and to determine the target bearing life corresponding to the target bearing preload based on the first target relationship and the second target relationship, so as to determine whether the target bearing life meets the preset bearing life condition, and to determine the target end cap clamping amount as the final end cap clamping amount when the target bearing life meets the preset bearing life condition.

[0070] As can be seen, this application obtains the equivalent fatigue load by processing the time-series load of the target wind turbine under the specified design standards, determines the first and second target relationships using the dynamic transmission chain model of the target wind turbine, and determines the third target relationship using the static transmission chain model. This allows the target end cap clamping amount to be determined using the previously obtained equivalent fatigue load and ultimate load. Based on the third target relationship, the target bearing preload corresponding to the target end cap clamping amount is determined. Then, based on the second target relationship, the operating clearance corresponding to the target bearing preload is determined, and based on the first target relationship, the bearing life corresponding to the operating clearance is determined, which is also the target bearing life corresponding to the target end cap clamping amount. Finally, when the target bearing life reaches the expected bearing life, the target end cap clamping amount is determined as the final end cap clamping amount, thus ensuring that the calculation results of the clamping amount are applicable to the wind turbine bearings and reducing the impact on the service life of the wind turbine transmission system.

[0071] In one specific embodiment, the load processing module 11 may include:

[0072] The operating condition analysis submodule is used to determine the wind turbine torque, wind turbine bending moment, time-series load, ultimate load, and duration distribution of each operating condition of the target wind turbine in the stationary coordinate system at the hub center based on the operating conditions.

[0073] The load processing submodule is used to perform equivalent segmentation processing on the time-series load based on the wind turbine torque, the wind turbine bending moment, the time-series load, and the duration distribution of each of the operating conditions to determine the equivalent fatigue load of a preset target number of groups.

[0074] In one specific embodiment, the device may further include:

[0075] The first transmission chain model building module is used to establish the dynamic transmission chain model using a pre-set first boundary condition. The dynamic transmission chain model includes a hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, front and rear end covers, and gearbox interface. The first boundary condition is a boundary condition constructed based on equivalent fatigue load, transmission chain gravity load, and tower degrees of freedom.

[0076] In one specific embodiment, the target relationship determination module 12 may include:

[0077] The first relationship determination submodule is used to determine the life index of the single-row tapered roller bearing of the target wind turbine corresponding to the preload of each bearing using the dynamic transmission chain model of the target wind turbine, and to determine the bearing life based on the life index, so as to obtain the first target relationship and the second target relationship.

[0078] In one specific embodiment, the device may further include:

[0079] The second transmission chain model building module is used to establish the static transmission chain model using the pre-set second boundary conditions and temperature boundary conditions, to spatially discretize the static transmission chain model, and to set the material properties of the static transmission chain model based on the material properties of the target wind turbine.

[0080] The static transmission chain model includes a hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, gearbox interface, bolts, and pins. The second boundary condition of the static transmission chain model is a boundary condition constructed based on all degrees of freedom of the main shaft and hub mounting surface, the preload of the rear end cover locking bolts and the preload of the gear ring bolts and the connecting bolts between the planetary carrier and the main shaft.

[0081] In one specific embodiment, the target clamping amount determination module 13 may specifically include:

[0082] The constraint modification submodule is used to remove constraints on all degrees of freedom of the main shaft and hub mounting surface, and to constrain the degrees of freedom of the tower.

[0083] The first axial contact information acquisition submodule is used to apply gravity to the static transmission chain model based on the actual center of gravity of the transmission chain of the target wind turbine, and apply the equivalent fatigue load at the hub center to obtain the first axial contact information.

[0084] The second axial information acquisition submodule is used to change the equivalent fatigue load applied to the center of the hub into the ultimate load in order to obtain the second axial contact information.

[0085] The end cap clamping amount determination submodule is used to determine the target end cap clamping amount based on the first axial contact information and the second axial contact information.

[0086] In one specific embodiment, the end cap clamping amount determination submodule may specifically include:

[0087] The region ratio determination unit is used to determine whether the target region ratio corresponding to the current end cap pressing amount is less than the preset region ratio based on the first axial contact information and the second axial contact information.

[0088] The static model reconstruction unit is used to increase the end cap clamping amount to obtain a new end cap clamping amount if the target area ratio is smaller than the preset area ratio, and then jump to the step of establishing the static transmission chain model using the preset second boundary conditions and temperature boundary conditions.

[0089] The target area ratio is the ratio of the effective contact pressure area to the preset contact area, and the effective contact pressure area is the area where the contact pressure is greater than the preset contact pressure.

[0090] Furthermore, embodiments of this application also disclose an electronic device, Figure 8 This is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content of the diagram should not be construed as limiting the scope of this application.

[0091] Figure 8 This is a schematic diagram of the structure of an electronic device 20 provided in an embodiment of this application. Specifically, the electronic device 20 may 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 stores a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the method for determining the bearing end cover clamping amount of a wind turbine generator disclosed in any of the foregoing embodiments. Alternatively, the electronic device 20 in this embodiment may specifically be a computer.

[0092] In this embodiment, the power supply 23 is used to provide operating 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 external devices, and the communication protocol it follows can be any communication protocol applicable to the technical solution of this application, and is not specifically limited here; the input / output interface 25 is used to acquire 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.

[0093] In addition, the memory 22, as a carrier for resource storage, can be a read-only memory, random access memory, disk, or optical disk, etc. The resources stored thereon can include an operating system 221, computer programs 222, etc., and the storage method can be temporary storage or permanent storage.

[0094] The operating system 221 is used to manage and control the various hardware devices on the electronic device 20 and the computer program 222, which may be Windows Server, Netware, Unix, Linux, etc. In addition to including a computer program capable of performing the method for determining the bearing end cover clamping amount of a wind turbine generator set executed by the electronic device 20 as disclosed in any of the foregoing embodiments, the computer program 222 may further include computer programs capable of performing other specific tasks.

[0095] Furthermore, this application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, it implements the aforementioned method for determining the bearing end cover clamping amount of a wind turbine generator set. Specific steps of this method can be found in the corresponding content disclosed in the foregoing embodiments, and will not be repeated here.

[0096] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0097] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0098] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0099] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0100] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for determining the clamping amount of the bearing end cover of a wind turbine generator set, characterized in that, include: Determine the operating conditions of the target wind turbine under the specified design standards, determine the time-series load and ultimate load of the target wind turbine based on the operating conditions, and process the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load of a preset number of target turbines. The preload of each bearing is determined based on a preset preload setting method, and the bearing life of the target bearing of the target wind turbine corresponding to each bearing preload is determined using the dynamic transmission chain model of the target wind turbine, so as to obtain a first target relationship and a second target relationship; the first target relationship is the relationship between the bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance and the bearing preload. The third target relationship of the target wind turbine is determined based on the static transmission chain model of the target wind turbine, and the target end cap clamping amount is determined based on the ultimate load and the equivalent fatigue load; the third target relationship is the relationship between the bearing preload and the end cap clamping amount. Based on the third target relationship, the target bearing preload corresponding to the target end cap clamping amount is determined, and based on the first target relationship and the second target relationship, the target bearing life corresponding to the target bearing preload is determined, so as to determine whether the target bearing life meets the preset bearing life condition, and when the target bearing life meets the preset bearing life condition, the target end cap clamping amount is determined as the final end cap clamping amount.

2. The method for determining the bearing end cover clamping amount of a wind turbine generator set according to claim 1, characterized in that, The step of determining the time-series load and ultimate load of the target wind turbine based on the operating conditions, and processing the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load for a preset number of target turbines, includes: Based on the operating conditions, determine the wind turbine torque, wind turbine bending moment, time-series load, ultimate load, and duration distribution of each operating condition of the target wind turbine in the stationary coordinate system at the hub center. The time-series load is equivalently segmented based on the wind turbine torque, the wind turbine bending moment, the time-series load, and the duration distribution of each operating condition to determine the equivalent fatigue load of a preset target number of groups.

3. The method for determining the bearing end cover clamping amount of a wind turbine generator set according to claim 1, characterized in that, Before determining the bearing life of the target bearing of the target wind turbine corresponding to the preload force of each bearing using the dynamic transmission chain model corresponding to the target wind turbine, the method further includes: The dynamic transmission chain model is established using a pre-defined first boundary condition. The dynamic transmission chain model includes a hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, front and rear end covers, and gearbox interface. The first boundary condition is a boundary condition constructed based on equivalent fatigue load, transmission chain gravity load, and tower degrees of freedom.

4. The method for determining the bearing end cover clamping amount of a wind turbine generator set according to claim 3, characterized in that, The step of determining the bearing life of the target bearing of the target wind turbine corresponding to the preload of each bearing using the dynamic transmission chain model corresponding to the target wind turbine, in order to obtain the first target relationship and the second target relationship, includes: The life index of the single-row tapered roller bearing of the target wind turbine is determined by using the dynamic transmission chain model corresponding to the bearing preload of each bearing, and the bearing life is determined based on the life index to obtain the first target relationship and the second target relationship.

5. The method for determining the bearing end cover clamping amount of a wind turbine generator set according to any one of claims 1 to 4, characterized in that, Before determining the third target relationship of the target wind turbine based on the static transmission chain model of the target wind turbine, the method further includes: The static transmission chain model is established using pre-set second boundary conditions and temperature boundary conditions. The static transmission chain model is spatially discretized, and the material properties of the static transmission chain model are set based on the material properties of the target wind turbine. The static transmission chain model includes a hub, main shaft, bearing housing, front frame, yaw bearing, tower top, single-row tapered roller bearing, gearbox interface, bolts, and pins. The second boundary condition of the static transmission chain model is a boundary condition constructed based on all degrees of freedom of the main shaft and hub mounting surface, the preload of the rear end cover locking bolts and the preload of the gear ring bolts and the connecting bolts between the planetary carrier and the main shaft.

6. The method for determining the bearing end cover clamping amount of a wind turbine generator set according to claim 5, characterized in that, Determining the target end cap clamping amount based on the ultimate load and the equivalent fatigue load includes: Remove all constraints on the spindle and hub mounting surfaces, and constrain the tower's degrees of freedom; Gravity is applied to the static transmission chain model based on the actual center of gravity of the transmission chain of the target wind turbine, and the equivalent fatigue load is applied at the center of the hub to obtain the first axial contact information; The equivalent fatigue load applied to the center of the hub is changed to the ultimate load to obtain the second axial contact information; The target end cap clamping amount is determined based on the first axial contact information and the second axial contact information.

7. The method for determining the bearing end cover clamping amount of a wind turbine generator set according to claim 6, characterized in that, Determining the target end cap clamping amount based on the first axial contact information and the second axial contact information includes: Based on the first axial contact information and the second axial contact information, determine whether the target area ratio corresponding to the current end cap clamping amount is less than the preset area ratio. If the target area ratio is smaller than the preset area ratio, the end cap clamping amount is increased to obtain a new end cap clamping amount, and the process jumps to the step of establishing the static transmission chain model using the preset second boundary conditions and temperature boundary conditions. The target area ratio is the ratio of the effective contact pressure area to the preset contact area, and the effective contact pressure area is the area where the contact pressure is greater than the preset contact pressure.

8. A device for determining the clamping amount of a bearing end cover in a wind turbine generator set, characterized in that, include: The load processing module is used to determine the operating conditions of the target wind turbine under the specified design standards, determine the time-series load and ultimate load of the target wind turbine based on the operating conditions, and process the time-series load based on the duration distribution of each operating condition to determine the equivalent fatigue load of a preset number of target turbines. The target relationship determination module is used to determine the preload of each bearing based on a preset preload setting method, and to determine the bearing life of the target bearing of the target wind turbine corresponding to each bearing preload using the dynamic transmission chain model of the target wind turbine, so as to obtain a first target relationship and a second target relationship; the first target relationship is the relationship between the bearing life and the operating clearance of the target bearing, and the second target relationship is the relationship between the operating clearance and the bearing preload; The target clamping amount determination module is used to determine the third target relationship of the target wind turbine based on the static transmission chain model of the target wind turbine, and to determine the target end cap clamping amount based on the ultimate load and the equivalent fatigue load; the third target relationship is the relationship between the bearing preload and the end cap clamping amount; The final clamping amount determination module is used to determine the target bearing preload corresponding to the target end cap clamping amount based on the third target relationship, and to determine the target bearing life corresponding to the target bearing preload based on the first target relationship and the second target relationship, so as to determine whether the target bearing life meets the preset bearing life condition, and to determine the target end cap clamping amount as the final end cap clamping amount when the target bearing life meets the preset bearing life condition.

9. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the method for determining the bearing end cap clamping amount of a wind turbine generator as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Used to store a computer program, wherein the computer program, when executed by a processor, implements the method for determining the bearing end cover clamping amount of a wind turbine generator set as described in any one of claims 1 to 7.

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