Method, device and equipment for determining compression amount of bearing end cover of wind generating set and storage medium

Abstract

The invention discloses a method, a device and equipment for determining the compression amount of a bearing end cover of a wind generating set and a storage medium, and relates to the field of wind power, and the method comprises the following steps: determining each operation condition of a target wind generating set, and determining a limit load and an equivalent fatigue load based on the operation conditions; determining the pre-tightening force of each bearing, and determining the bearing life corresponding to the pre-tightening force of each bearing by using a dynamic transmission chain model to obtain a first target relationship and a second target relationship; the first target relation is the relation between the bearing life and the operation clearance, and the second target relation is the relation between the operation clearance and the bearing pre-tightening force; determining a third target relationship based on the statics transmission chain model, and determining a target end cover compression amount based on the limit load and the equivalent fatigue load; the third target relation is the relation between the bearing pre-tightening force and the end cover pressing amount; and based on the third target relationship, the first target relationship and the second target relationship, determining the compression amount of the terminal cover. The calculation result of the compression amount of the end cover is ensured to be suitable for the wind turbine generator set bearing.

Description

Technical Field

[0001] The present invention relates to the field of wind power, and in particular to a method, a device, a equipment and a storage medium for determining the pressing amount of a bearing end cover of a wind power generator set. Background Art

[0002] With the development trend of large-scale wind turbines, the span of the transmission chain system increases, and the use of single-row tapered roller bearings with O-type arrangement has become one of the preferred solutions. Ensuring the correct installation of the bearings to ensure that the unit reaches the design life of 20 or even 25 years to avoid power generation loss and on-site replacement costs caused by premature failure has become a top priority. In the current calculation method of the clamping amount of the double tapered roller bearing arrangement for wind power, only the pre-tightening process is considered in the design calculation of determining the clamping amount, resulting in low efficiency of the finite element modeling method used in the calculation, the use of solid rollers and poor calculation convergence, resulting in the wind turbine transmission system being prone to premature failure, and lack of accurate guidance for the actual application of wind turbine bearings.

[0003] In summary, how to ensure that the calculation results of the clamping amount are applicable to the wind turbine bearings to reduce the impact on the service life of the wind turbine transmission system is an urgent problem to be solved. Summary of the invention

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

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

[0006] Determine each operating condition of the target wind turbine set under a specified design standard, determine the time series load and the limit load of the target wind turbine set based on the operating condition, 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 number of groups;

[0007] The preload force of each bearing is determined based on a preset preload force setting method, and the bearing life of the target bearing of the target wind turbine set corresponding to each bearing preload force is determined using a dynamic transmission chain model corresponding to the target wind turbine set, 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 force;

[0008] Determining a third target relationship of the target wind turbine generator set based on a static transmission chain model of the target wind turbine generator set, and determining a target end cover compression amount based on the limit load and the equivalent fatigue load; the third target relationship is a relationship between the bearing preload and the end cover compression amount;

[0009] The target bearing preload corresponding to the target end cover 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 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 cover clamping amount is determined as the final end cover clamping amount.

[0010] Optionally, determining the time series load and the limit load of the target wind turbine generator set based on the operating condition, 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 groups includes:

[0011] Determine the wind turbine torque, wind turbine bending moment, time series load, limit load and duration distribution of each of the operating conditions of the target wind turbine set in a hub center stationary coordinate system based on the operating conditions;

[0012] 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, the time series load is equivalently divided to determine equivalent fatigue loads of a preset target number of groups.

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

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

[0015] Optionally, the determining the bearing life of the target bearing of the target wind turbine set corresponding to each bearing preload force by using the dynamic transmission chain model corresponding to the target wind turbine set 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 set corresponding to each bearing preload force is determined by using the dynamic transmission chain model corresponding to the target wind turbine set, 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 group based on the static transmission chain model of the target wind turbine group, the method further includes:

[0018] Establishing the static transmission chain model by using the preset second boundary condition and temperature boundary condition, spatially discretizing the static transmission chain model, and setting the material properties of the static transmission chain model based on the material properties of the target wind turbine;

[0019] Among them, the static transmission chain model includes a wheel hub, a main shaft, a bearing seat, a front frame, a yaw bearing, a tower top, a single-row tapered roller bearing, a gearbox interface part, 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 the hub mounting surface, the preload force of the rear end cover locking bolts and the preload force of the ring gear bolts, and the planetary carrier and main shaft connecting bolts.

[0020] Optionally, determining the target end cover compression amount based on the limit load and the equivalent fatigue load includes:

[0021] Unconstraining all degrees of freedom of the main shaft and the hub mounting surface, and constraining the degrees of freedom of the tower;

[0022] Applying gravity to the static transmission chain model based on the actual center of gravity of the transmission chain of the target wind turbine generator set, and applying the equivalent fatigue load to the center of the hub to obtain first axial contact information;

[0023] changing the equivalent fatigue load applied to the hub center into the limit load to obtain second axial contact information;

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

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

[0026] Determining whether the target area ratio corresponding to the current end cover pressing amount is less than a preset area ratio based on the first axial contact information and the second axial contact information;

[0027] If the target area ratio is less than the preset area ratio, the end cover pressing amount is increased to obtain a new end cover pressing amount, and the process jumps to the step of establishing the static transmission chain model by using the preset second boundary condition and temperature boundary condition;

[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 an area where the contact pressure is greater than the preset contact pressure.

[0029] In a second aspect, the present application discloses a device for determining the compression amount of a bearing end cover of a wind turbine generator set, comprising:

[0030] A load processing module, used to determine various operating conditions of a target wind turbine generator set under a specified design standard, determine a sequential load and a limit load of the target wind turbine generator set based on the operating conditions, and process the sequential load based on the duration distribution of each of the operating conditions to determine an equivalent fatigue load of a preset target number of groups;

[0031] A target relationship determination module, used to determine the preload force of each bearing based on a preset preload force setting method, and to determine the bearing life of the target bearing of the target wind turbine group corresponding to each bearing preload force using a dynamic transmission chain model corresponding to the target wind turbine group, 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 force;

[0032] a target clamping amount determination module, configured to determine a third target relationship of the target wind turbine generator set based on a static transmission chain model of the target wind turbine generator set, and determine a target end cover clamping amount based on the limit load and the equivalent fatigue load; the third target relationship being a relationship between the bearing preload and the end cover clamping amount;

[0033] A final clamping amount determination module is used to determine the target bearing preload corresponding to the target end cover 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 cover clamping amount as the final end cover clamping amount when the target bearing life meets the preset bearing life condition.

[0034] In a third aspect, the present application discloses an electronic device, comprising:

[0035] Memory, used to store computer programs;

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

[0037] In a fourth aspect, the present 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 tightening amount of the bearing end cover of a wind turbine generator set.

[0038] In the present application, when determining the shaft system preload, the various operating conditions of the target wind turbine set under the specified design standard are determined, the timing load and the limit load of the target wind turbine set are determined based on the operating conditions, and the timing load is processed based on the duration distribution of each of the operating conditions to determine the equivalent fatigue load of a preset target number of groups; 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 set corresponding to each bearing preload is determined using the dynamic transmission chain model corresponding to the target wind turbine set 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 operating clearance. and the bearing preload; based on the static transmission chain model of the target wind turbine group, a third target relationship of the target wind turbine group is determined, and based on the limit load and the equivalent fatigue load, a target end cover clamping amount is determined; the third target relationship is the relationship between the bearing preload and the end cover clamping amount; based on the third target relationship, a target bearing preload corresponding to the target end cover clamping amount is determined, and based on the first target relationship and the second target relationship, a target bearing life corresponding to the target bearing preload is determined 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 cover clamping amount is determined as the final end cover clamping amount. It can be seen that the present application obtains an equivalent fatigue load by processing the time series load of the target wind turbine under the prescribed design standard, determines the first target relationship and the second target relationship using the dynamic transmission chain model of the target wind turbine, and determines the third target relationship using the static transmission chain model, so as to determine the target end cover clamping amount using the equivalent fatigue load and limit load obtained previously, thereby determining the target bearing preload corresponding to the target end cover clamping amount based on the third target relationship, and then determining the operating clearance corresponding to the target bearing preload based on the second target relationship, and determining the bearing life corresponding to the operating clearance based on the first target relationship, that is, the target bearing life corresponding to the target end cover clamping amount, and finally determining the target end cover clamping amount as the final end cover clamping amount when the target bearing life can reach the expected bearing life, thereby ensuring that the calculation result of the clamping amount is applicable to the wind turbine bearing, reducing the impact on the service life of the wind turbine transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0040] Figure 1 A flow chart of a method for determining the compression amount of a bearing end cover of a wind turbine generator set disclosed in the present application;

[0041] Figure 2 A schematic flow chart of a method for determining the compression amount of a bearing end cover of a wind turbine generator set disclosed in the present application;

[0042] Figure 3 A schematic diagram of a hub center stationary coordinate system provided in this application;

[0043] Figure 4 A schematic diagram of the relationship between a bearing preload and an end cover compression amount disclosed in the present application;

[0044] Figure 5 A schematic diagram of a target area disclosed in the present application when the target area ratio is smaller than a preset area ratio;

[0045] Figure 6 A schematic diagram of a target area when the target area ratio disclosed in the present application is greater than a preset area ratio;

[0046] Figure 7 A schematic diagram of the structure of a device for determining the compression amount of a bearing end cover of a wind turbine generator set disclosed in the present application;

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

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the current method for calculating the compression amount of the double tapered roller bearing arrangement for wind power, only the pre-tightening process is considered in the design calculation of determining the compression amount, resulting in low efficiency of the finite element modeling method used in the calculation, the use of solid rollers and poor calculation convergence, which makes the wind turbine transmission system prone to premature failure and lacks accurate guidance for the actual application of wind turbine bearings. In order to solve the above technical problems, the present application discloses a method for determining the compression amount of the bearing end cover of a wind turbine generator set, which can ensure that the calculation result of the compression amount is applicable to the wind turbine bearing to reduce the impact on the service life of the wind turbine transmission system.

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

[0051] Step S11, determining various operating conditions of the target wind turbine group under the specified design standard, determining the timing load and the limit load of the target wind turbine group based on the operating conditions, and processing the timing load based on the duration distribution of each of the operating conditions to determine the equivalent fatigue load of a preset target number of groups.

[0052] In this embodiment, Figure 2 As shown, first, the wind turbine operating load needs to be processed. Specifically, the operating conditions of the target wind turbine set under the specified design standard are determined, so as to determine the timing load and limit load of the target wind turbine set based on the operating conditions, so as to process the timing load based on the duration distribution of the operating conditions to obtain the equivalent fatigue load of the preset target number of groups. The specific process may include: using the wind turbine dynamics simulation software to calculate the operating conditions of the target wind turbine set under the specified design standard (such as IEC61400-1, the wind power design standard issued by the International Electrotechnical Commission), so as to obtain Figure 3 The wind turbine torque, wind turbine bending moment, time series load and duration distribution of each operating condition in the hub center stationary coordinate system are shown, and then the time series load is equivalently divided based on the wind turbine torque, wind turbine bending moment, time series load and duration distribution of the operating condition to determine the equivalent fatigue load of the preset target number of groups, where the preset target number of groups is not less than 300. At the same time, the extreme value extraction of the time series load is performed, that is, the maximum and minimum values ​​of My, Mz, Myz and Fx, Fy, Fz, Fyz when the target wind turbine is running are extracted, as well as the values ​​of other mechanical components at this moment.

[0053] Step S12, determining the preload force of each bearing based on a preset preload force setting method, and using the dynamic transmission chain model corresponding to the target wind turbine group to determine the bearing life of the target bearing of the target wind turbine group corresponding to each bearing preload force, 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 force.

[0054] In this embodiment, before using the dynamic transmission chain model corresponding to the target wind turbine to determine the bearing life of the target bearing of the target wind turbine corresponding to each bearing preload, it is also necessary to use a pre-set first boundary condition to establish a dynamic transmission chain model; wherein, the dynamic transmission chain model includes a hub, a main shaft, a bearing seat, a front frame, a yaw bearing, a tower top, a single-row tapered roller bearing, front and rear end covers, and a gearbox interface part, and the first boundary condition is a boundary condition constructed based on equivalent fatigue loads, transmission chain gravity loads, and the degrees of freedom of the tower. The process of building a dynamic transmission chain model can be carried out using dynamic analysis software. In a specific embodiment, the equivalent fatigue load will be used as the wind load at the center of the hub, and all degrees of freedom at the end of the tower will be constrained.

[0055] In this embodiment, after different bearing preload forces are determined based on the preset preload force setting method, the bearing life of the target bearing of the target wind turbine set corresponding to each bearing preload force is determined using the dynamic transmission chain model corresponding to the target wind turbine set to obtain the first target relationship and the second target relationship, which may specifically include: using the dynamic transmission chain model corresponding to the target wind turbine set to determine 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 fatigue is expected to occur) of the single-row tapered roller bearing of the target wind turbine set corresponding to each bearing preload force, the single-row tapered roller bearing is a bearing on the main shaft of the target wind turbine set, 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 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 force, the relationship between the bearing life and the bearing preload force can be established based on the first target relationship and the second target relationship.

[0056] Step S13, determining a third target relationship of the target wind turbine group based on the static transmission chain model of the target wind turbine group, and determining a target end cover clamping amount based on the limit load and the equivalent fatigue load; the third target relationship is the relationship between the bearing preload and the end cover clamping amount.

[0057] In this embodiment, the third target relationship of the target wind turbine is determined based on the static transmission chain model of the target wind turbine. It is also necessary to establish the static transmission chain model using the pre-set second boundary condition and temperature boundary condition, discretize the static transmission chain model in space, and then set the material properties of the static transmission chain model based on the material properties of the target wind turbine. Among them, the static transmission chain model includes a hub, a main shaft, a bearing seat, a front frame, a yaw bearing, a tower top, a single-row tapered roller bearing, a gearbox interface part, bolts, and pins. The single-row tapered roller bearing is a bearing on the main shaft of the target wind turbine; 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 the hub mounting surface, the preload of the rear end cover locking bolts and the preload of the ring gear bolts and the planetary frame and main shaft connecting bolts. The process of building a static transmission chain model can be carried out using finite element analysis software. When the static transmission chain model is spatially discretized, the static transmission chain 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 divided into bodies. The number of spatial discrete nodes in the axial and circumferential directions is consistent. The material properties include the density, Poisson's ratio, Young's modulus, thermal expansion coefficient, etc. of the actual material. The temperature boundary condition is the boundary condition determined based on the temperature of the bearing and the surrounding structure.

[0058] In a specific implementation, the bearing rollers of the static transmission chain model are simplified to spring units, and the roller stiffness calculation method refers to ISO16281; the contact between the bearing and the surrounding structure is hard contact, the interference 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 VDI2230; the initial interference between the bearing and the surrounding structure is calculated according to the design assembly dimensions, and interference friction contact is established in the finite element model. Calculated according to the front bearing inner ring-spindle width variation coefficient K1, the rear bearing inner ring-spindle width variation coefficient K2, the front bearing outer ring-bearing seat width variation coefficient K3, and the rear bearing outer ring-bearing seat width variation coefficient K4. Multiply the initial interference with the corresponding width variation coefficient at each position to obtain the predicted displacement of the rear bearing inner ring. , set the clearance between the inner ring of the rear bearing and the locking end cover to , is the calculation variable, i.e. the end cap clamping amount. Among them, the initial interference of the surrounding structure can be calculated and verified according to the upper and lower limits of the actual processing error.

[0059] After using the second boundary condition and establishing the static transmission chain model, the relative displacements of the inner and outer rings of the front and rear bearings can be extracted based on the static transmission chain model and recorded as Y1 and Y2 respectively, thereby obtaining the third target relationship, that is, the relationship between the bearing preload and the end cover clamping amount, as shown in Figure 4As shown. After that, the target end cap clamping amount can be determined based on the limit load and equivalent fatigue load, which can specifically include: canceling the constraints on all degrees of freedom of the main shaft and the 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 transmission chain of the target wind turbine, and applying an equivalent fatigue load to the center of the hub to obtain the first axial contact information; changing the equivalent fatigue load applied to the center of the hub to the limit load to obtain the second axial contact information; determining the target end cap clamping amount based on the first axial contact information and the second axial contact information. Among them, the axial contact information is the axial contact information between the bearing and the main shaft and the end cap bearing seat.

[0060] In this embodiment, the target end cap compression amount is determined based on the first axial contact information and the second axial contact information, which may specifically include: judging whether the target area ratio corresponding to the current end cap compression amount is less than the 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, then increasing the end cap compression amount to obtain a new end cap compression amount, and jumping to the step of establishing a static transmission chain model using the preset second boundary condition and temperature boundary condition; 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 the contact pressure is greater than 10000Pa, then the area can be determined to be an effective contact pressure area. Figure 5 That is, the target area ratio is not less than the preset area ratio. Figure 6 That is, a situation where the target area ratio is smaller than the preset area ratio.

[0061] Step S14, determining the target bearing preload corresponding to the target end cover clamping amount based on the third target relationship, and determining 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 when the target bearing life meets the preset bearing life condition, determining the target end cover clamping amount as the final end cover clamping amount.

[0062] In this embodiment, since the first target relationship is the relationship between the operating clearance and the bearing life, the second target relationship is the relationship between the bearing preload and the operating clearance, and the third target relationship is the relationship between the end cover clamping amount and the bearing preload, after determining the target end cover clamping amount, the target bearing preload corresponding to the target end cover clamping amount can be determined based on the third target relationship, and 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, thereby determining the target bearing life corresponding to the target end cover clamping amount, 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, it is necessary to determine a new target end cover clamping amount and determine whether the bearing life corresponding to the new target end cover clamping amount meets the preset bearing life condition; if the target bearing life meets the preset bearing life condition, the target end cover clamping amount can be determined as the final end cover clamping amount.

[0063] It is understandable that 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 target relationship is the relationship between the bearing life corresponding to the life index of the double-row tapered roller bearing and the bearing preload. That is to say, due to the different specific structures of the actual wind turbines, the constructed dynamic transmission chain model and the static transmission chain model will be different. Accordingly, the specific parameters of the first target relationship, the second target relationship and the third target relationship will also change due to the differences between the dynamic transmission chain model and the static transmission chain model. However, since the independent variables and dependent variables of each target relationship have not changed, the final cover compression amount suitable for the target wind turbine can still be determined based on the first target relationship, the second target relationship and the third target relationship.

[0064] It can be seen that the present application obtains an equivalent fatigue load by processing the time series load of the target wind turbine under the prescribed design standard, determines the first target relationship and the second target relationship using the dynamic transmission chain model of the target wind turbine, and determines the third target relationship using the static transmission chain model, so as to determine the target end cover clamping amount using the equivalent fatigue load and limit load obtained previously, thereby determining the target bearing preload corresponding to the target end cover clamping amount based on the third target relationship, and then determining the operating clearance corresponding to the target bearing preload based on the second target relationship, and determining the bearing life corresponding to the operating clearance based on the first target relationship, that is, the target bearing life corresponding to the target end cover clamping amount, and finally determining the target end cover clamping amount as the final end cover clamping amount when the target bearing life can reach the expected bearing life, thereby ensuring that the calculation result of the clamping amount is applicable to the wind turbine bearing, reducing the impact on the service life of the wind turbine transmission system.

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

[0066] A load processing module 11 is used to determine various operating conditions of a target wind turbine generator set under a specified design standard, determine a time series load and a limit load of the target wind turbine generator set based on the operating conditions, and process the time series load based on the duration distribution of each operating condition to determine an equivalent fatigue load of a preset target number of groups;

[0067] The target relationship determination module 12 is used to determine the preload force of each bearing based on a preset preload force setting method, and to determine the bearing life of the target bearing of the target wind turbine group corresponding to each bearing preload force using the dynamic transmission chain model corresponding to the target wind turbine group, 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 force;

[0068] A target clamping amount determination module 13 is used to determine a third target relationship of the target wind turbine generator set based on a static transmission chain model of the target wind turbine generator set, and to determine a target end cover clamping amount based on the limit load and the equivalent fatigue load; the third target relationship is a relationship between the bearing preload and the end cover clamping amount;

[0069] The final clamping amount determination module 14 is used to determine the target bearing preload corresponding to the target end cover 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 cover clamping amount as the final end cover clamping amount when the target bearing life meets the preset bearing life condition.

[0070] It can be seen that the present application obtains an equivalent fatigue load by processing the time series load of the target wind turbine under the prescribed design standard, determines the first target relationship and the second target relationship using the dynamic transmission chain model of the target wind turbine, and determines the third target relationship using the static transmission chain model, so as to determine the target end cover clamping amount using the equivalent fatigue load and limit load obtained previously, thereby determining the target bearing preload corresponding to the target end cover clamping amount based on the third target relationship, and then determining the operating clearance corresponding to the target bearing preload based on the second target relationship, and determining the bearing life corresponding to the operating clearance based on the first target relationship, that is, the target bearing life corresponding to the target end cover clamping amount, and finally determining the target end cover clamping amount as the final end cover clamping amount when the target bearing life can reach the expected bearing life, thereby ensuring that the calculation result of the clamping amount is applicable to the wind turbine bearing, reducing the impact on the service life of the wind turbine transmission system.

[0071] In a specific implementation, the load processing module 11 may specifically include:

[0072] An operating condition analysis submodule, for determining the wind turbine torque, wind turbine bending moment, sequential load, limit load and duration distribution of each operating condition of the target wind turbine in a hub center stationary coordinate system based on the operating condition;

[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 operating condition to determine the equivalent fatigue load of a preset target number of groups.

[0074] In a 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 preset first boundary condition; the dynamic transmission chain model includes a hub, a main shaft, a bearing seat, a front frame, a yaw bearing, a tower top, a single-row tapered roller bearing, front and rear end covers, and a gearbox interface part, and the first boundary condition is a boundary condition constructed based on equivalent fatigue loads, transmission chain gravity loads and the degrees of freedom of the tower.

[0076] In a specific implementation, the target relationship determination module 12 may specifically 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 group corresponding to each bearing preload force by using the dynamic transmission chain model corresponding to the target wind turbine group, and determine the bearing life based on the life index to obtain the first target relationship and the second target relationship.

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

[0079] a second transmission chain model building module, used to establish the static transmission chain model by using a preset second boundary condition and a temperature boundary condition, spatially discretize the static transmission chain model, and set the material properties of the static transmission chain model based on the material properties of the target wind turbine;

[0080] Among them, the static transmission chain model includes a wheel hub, a main shaft, a bearing seat, a front frame, a yaw bearing, a tower top, a single-row tapered roller bearing, a gearbox interface part, 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 the hub mounting surface, the preload force of the rear end cover locking bolts and the preload force of the ring gear bolts, and the planetary carrier and main shaft connecting bolts.

[0081] In a specific implementation, the target compression amount determination module 13 may specifically include:

[0082] A constraint modification submodule, used to cancel the constraints on all degrees of freedom of the main shaft and the hub mounting surface, and constrain the degrees of freedom of the tower;

[0083] A first axial contact information acquisition submodule, used for applying gravity to the static transmission chain model based on the actual center of gravity of the transmission chain of the target wind turbine generator set, and applying the equivalent fatigue load at the center of the hub to obtain first axial contact information;

[0084] A second axial information acquisition submodule, used for changing the equivalent fatigue load applied to the center of the hub into the limit load to obtain second axial contact information;

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

[0086] In a specific implementation, the end cap compression amount determination submodule may specifically include:

[0087] an area ratio judgment unit, configured to judge whether a target area ratio corresponding to a current end cover pressing amount is less than a preset area ratio based on the first axial contact information and the second axial contact information;

[0088] A statics model reconstruction unit, configured to increase the end cover pressing amount to obtain a new end cover pressing amount if the target area ratio is less than the preset area ratio, and jump to the step of establishing the statics transmission chain model by using the preset second boundary condition and temperature boundary condition;

[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 an area where the contact pressure is greater than the preset contact pressure.

[0090] Furthermore, the present application also discloses an electronic device. Figure 8 This is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content in the diagram cannot be regarded as any limitation on the scope of use of the present application.

[0091] Figure 8 A schematic diagram of the structure of an electronic device 20 provided in an embodiment of the present application. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 is used to store a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the method for determining the tightening amount of the bearing end cover of a wind turbine generator set disclosed in any of the aforementioned embodiments. In addition, the electronic device 20 in this embodiment may specifically be an electronic computer.

[0092] In this embodiment, the power supply 23 is used to provide working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present application, and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs and is not specifically limited here.

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

[0094] The operating system 221 is used to manage and control the hardware devices and computer program 222 on the electronic device 20, and can be Windows Server, Netware, Unix, Linux, etc. In addition to the computer program that can be used to complete the method for determining the bearing end cover compression amount of the wind turbine generator set executed by the electronic device 20 disclosed in any of the aforementioned embodiments, the computer program 222 can further include computer programs that can be used to complete other specific tasks.

[0095] Furthermore, the present application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the aforementioned method for determining the bearing end cover compression amount of a wind turbine generator set disclosed above is implemented. The specific steps of the method can be referred to the corresponding contents disclosed in the aforementioned embodiments, and will not be repeated here.

[0096] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0097] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0098] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0099] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0100] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for determining the compression amount of a bearing end cover of a wind turbine generator set, characterized in that: include: Determine each operating condition of the target wind turbine set under a specified design standard, determine the time series load and the limit load of the target wind turbine set based on the operating condition, 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 number of groups; The preload force of each bearing is determined based on a preset preload force setting method, and the bearing life of the target bearing of the target wind turbine set corresponding to each bearing preload force is determined using a dynamic transmission chain model corresponding to the target wind turbine set, 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 force; Determining a third target relationship of the target wind turbine generator set based on a static transmission chain model of the target wind turbine generator set, and determining a target end cover compression amount based on the limit load and the equivalent fatigue load; the third target relationship is a relationship between the bearing preload and the end cover compression amount; The target bearing preload corresponding to the target end cover 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 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 cover clamping amount is determined as the final end cover clamping amount.

2. The method for determining the compression amount of the bearing end cover of a wind turbine generator set according to claim 1, characterized in that: The determining of the time series load and the limit load of the target wind turbine generator set based on the operating condition, 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 groups, includes: Determine the wind turbine torque, wind turbine bending moment, time series load, limit load and duration distribution of each of the operating conditions of the target wind turbine set in a hub center stationary coordinate system based on the operating conditions; 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, the time series load is equivalently divided to determine equivalent fatigue loads of a preset target number of groups.

3. The method for determining the compression amount of the bearing end cover 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 group corresponding to each bearing preload force by using the dynamic transmission chain model corresponding to the target wind turbine group, the method further includes: The dynamic transmission chain model is established using a preset first boundary condition; the dynamic transmission chain model includes a hub, a main shaft, a bearing seat, a front frame, a yaw bearing, a tower top, a single-row tapered roller bearing, front and rear end covers, and a gearbox interface part, and the first boundary condition is a boundary condition constructed based on equivalent fatigue loads, transmission chain gravity loads, and the degrees of freedom of the tower.

4. The method for determining the compression amount of the bearing end cover of a wind turbine generator set according to claim 3 is characterized in that: The method of using the dynamic transmission chain model corresponding to the target wind turbine group to determine the bearing life of the target bearing of the target wind turbine group corresponding to each bearing preload force 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 group corresponding to each bearing preload force is determined by using the dynamic transmission chain model corresponding to the target wind turbine group, 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 pressing amount of the bearing end cover 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 generator set based on the static transmission chain model of the target wind turbine generator set, the method further includes: Establishing the static transmission chain model by using the preset second boundary condition and temperature boundary condition, spatially discretizing the static transmission chain model, and setting the material properties of the static transmission chain model based on the material properties of the target wind turbine; Among them, the static transmission chain model includes a wheel hub, a main shaft, a bearing seat, a front frame, a yaw bearing, a tower top, a single-row tapered roller bearing, a gearbox interface part, 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 the hub mounting surface, the preload force of the rear end cover locking bolts and the preload force of the ring gear bolts, and the planetary carrier and main shaft connecting bolts.

6. The method for determining the pressing amount of the bearing end cover of a wind turbine generator set according to claim 5, characterized in that: The determining of the target end cover compression amount based on the limit load and the equivalent fatigue load comprises: Unconstraining all degrees of freedom of the main shaft and the 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 transmission chain of the target wind turbine generator set, and applying the equivalent fatigue load to the center of the hub to obtain first axial contact information; changing the equivalent fatigue load applied to the hub center into the limit load to obtain second axial contact information; The target end cap compression amount is determined based on the first axial contact information and the second axial contact information.

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

8. A device for determining the pressing amount of a bearing end cover of a wind turbine generator set, characterized in that: include: A load processing module, used to determine various operating conditions of a target wind turbine generator set under a specified design standard, determine a sequential load and a limit load of the target wind turbine generator set based on the operating conditions, and process the sequential load based on the duration distribution of each of the operating conditions to determine an equivalent fatigue load of a preset target number of groups; A target relationship determination module, used to determine the preload force of each bearing based on a preset preload force setting method, and to determine the bearing life of the target bearing of the target wind turbine group corresponding to each bearing preload force using a dynamic transmission chain model corresponding to the target wind turbine group, 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 force; a target clamping amount determination module, configured to determine a third target relationship of the target wind turbine generator set based on a static transmission chain model of the target wind turbine generator set, and determine a target end cover clamping amount based on the limit load and the equivalent fatigue load; the third target relationship being a relationship between the bearing preload and the end cover clamping amount; A final clamping amount determination module is used to determine the target bearing preload corresponding to the target end cover 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 cover clamping amount as the final end cover 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 is used to execute the computer program to implement the method for determining the tightening amount of the bearing end cover of a wind turbine generator set 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 when the computer program is executed by a processor, the method for determining the tightening amount of the bearing end cover of a wind turbine generator set according to any one of claims 1 to 7 is implemented.

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