Fan bolt group axial force measuring method and system based on limited monitoring points and electronic equipment

Abstract

The invention relates to a fan bolt group axial force measurement method and system based on limited monitoring points and electronic equipment. The method comprises the steps that a limited number of ultrasonic axial force measurement sensors are arranged according to a target installation mode; measuring signals of the N ultrasonic axial force measuring sensors are collected, and an initial bolt load data set is obtained; constructing an inversion calculation condition; performing cyclic interpolation based on an inversion calculation condition and the initial bolt load data set to obtain load distribution data of the bolt set; and processing the load distribution data of the bolt group according to a set value to obtain target load data of the bolt group. According to the method, the stress conditions of all the bolts can be inversely calculated only by measuring the axial force of limited bolts, so that the monitoring cost is greatly reduced, and the method is suitable for fan monitoring. Meanwhile, a data basis is provided for evaluation of the fatigue state of the bolt and backstepping of the overall load state of the fan.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power detection equipment, and more specifically, to a method, system and electronic equipment for measuring the axial force of a wind turbine bolt group based on limited monitoring points. Background Art

[0002] Bolts are important connecting structural parts widely used in wind turbines, such as towers, wind turbine blades and other key parts. During the service of wind turbines, due to the randomness of wind loads, the axial force transmitted to each bolt also changes in real time, causing the bolts to be in an alternating load state, which is prone to fatigue failure and fracture. Therefore, real-time monitoring of the axial force data of the bolts is of great significance to the safety of wind turbines.

[0003] At present, the monitoring and measurement methods of bolt axial force are relatively mature, such as ultrasonic-based axial force measurement methods, pressure sensor-based axial force measurement methods, etc. The ultrasonic-based axial force measurement method has attracted widespread attention due to its advantages such as high measurement accuracy and no need to change the bolt fastening connection structure. However, these methods have one thing in common: they all require the sensor to be placed on the target bolt. For a wind turbine, a wind turbine has nearly a thousand bolt connections, and a wind turbine tower flange also has hundreds of bolts. If all bolts are to be monitored, hundreds of channels of monitoring equipment are required, resulting in expensive monitoring costs and not suitable for wind turbine monitoring. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method, system and electronic equipment for measuring the axial force of a fan bolt group based on limited monitoring points in view of the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for measuring the axial force of a fan bolt group based on limited monitoring points, comprising the following steps:

[0006] A finite number of ultrasonic axial force measurement sensors are set according to the target installation method; the finite number of ultrasonic axial force measurement sensors includes: N ultrasonic axial force measurement sensors;

[0007] Collecting measurement signals of the N ultrasonic axial force measurement sensors to obtain an initial bolt load data set;

[0008] Structural inversion calculation conditions;

[0009] Perform cyclic interpolation based on the inverse calculation conditions and the initial bolt load data group to obtain load distribution data of the bolt group;

[0010] The load distribution data of the bolt group is processed according to the set value to obtain the target load data of the bolt group.

[0011] In the method for measuring the axial force of a fan bolt group based on limited monitoring points according to the present invention, the provision of a limited number of ultrasonic axial force measurement sensors according to the target installation method includes:

[0012] Determine a bolt group to be monitored; the number of bolts in the bolt group is M;

[0013] N ultrasonic axial force measurement sensors are evenly spaced on N bolts, and the first ultrasonic axial force measurement sensor is arranged on the first bolt in a group of M bolts; wherein N and M are integers, and N≤M.

[0014] In the method for measuring the axial force of a fan bolt group based on limited monitoring points described in the present invention, collecting the measurement signals of the N ultrasonic axial force measurement sensors to obtain the initial bolt load data group includes:

[0015] Collect and record measurement signals of N ultrasonic axial force measurement sensors to obtain N bolt load data;

[0016] The initial bolt load data set is obtained by subtracting the initial installation pre-tightening force of the bolt from the N bolt load data.

[0017] In the wind turbine bolt group axial force measurement method based on limited monitoring points described in the present invention, the structural inversion calculation conditions include:

[0018] splicing N1 initial bolt load data groups to obtain a first load data group;

[0019] Construct an interpolation sequence array;

[0020] Use the sinc function to construct the interpolation array;

[0021] Sets the interpolated data group that stores the interpolated bolt data.

[0022] In the wind turbine bolt group axial force measurement method based on limited monitoring points of the present invention, the cyclic interpolation based on the inversion calculation condition and the initial bolt load data group to obtain the load distribution data of the bolt group includes the following steps:

[0023] Step S01: when the cycle amount is 0, the offset is obtained by calculating according to the length of the sequence number array, the sequence number array, the number of bolts in the bolt group, and the number of ultrasonic axial force measurement sensors;

[0024] Step S02: performing calculation according to the interpolation array, the offset, the first load data group and the interpolated data group to obtain an interpolated bolt load data group;

[0025] Step S03: Repeat steps S01 to S02 according to the set cycle amount to obtain the load distribution data of the bolt group.

[0026] In the wind turbine bolt group axial force measurement method based on limited monitoring points of the present invention, the load distribution data of the bolt group is processed according to the set value to obtain the target load data of the bolt group, which includes:

[0027] According to the set value, the target load data of the bolt group is obtained by taking out the load distribution data of the bolt group according to the sequence number.

[0028] In the fan bolt group axial force measurement method based on limited monitoring points described in the present invention, N is greater than or equal to 8; N1 is an odd number, and the minimum value of N1 is 5.

[0029] In the method for measuring the axial force of a fan bolt group based on limited monitoring points described in the present invention, the method further includes:

[0030] Collecting real-time monitoring signals of the N ultrasonic axial force measurement sensors;

[0031] Reconstruct data based on the real-time monitoring signal to obtain real-time load data of the bolt group;

[0032] Comparing the target load data of the bolt group with the real-time load data of the bolt group;

[0033] Whether the bolt load in the bolt group is abnormal is determined based on the comparison result.

[0034] The present invention further provides a fan bolt group axial force measurement system based on limited monitoring points, which is applied to the above-mentioned fan bolt group axial force measurement method based on limited monitoring points, comprising:

[0035] A setting unit is used to set a finite number of ultrasonic axial force measurement sensors according to a target installation mode; the finite number of ultrasonic axial force measurement sensors includes: N ultrasonic axial force measurement sensors;

[0036] A data acquisition unit, used to collect measurement signals of the N ultrasonic axial force measurement sensors to obtain an initial bolt load data set;

[0037] An inversion calculation construction unit is used to construct inversion calculation conditions;

[0038] A load distribution calculation unit, used for performing cyclic interpolation based on the inverse calculation condition and the initial bolt load data group to obtain load distribution data of the bolt group;

[0039] The target load calculation unit is used to process the load distribution data of the bolt group according to a set value to obtain the target load data of the bolt group.

[0040] The present invention also provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the above-mentioned method for measuring the axial force of a fan bolt group based on limited monitoring points by calling the computer program stored in the memory.

[0041] The wind turbine bolt group axial force measurement method, system and electronic equipment based on limited monitoring points implemented in the present invention have the following beneficial effects: including: setting a limited number of ultrasonic axial force measurement sensors according to the target installation method; collecting measurement signals of N ultrasonic axial force measurement sensors to obtain an initial bolt load data group; constructing an inversion calculation condition; performing cyclic interpolation based on the inversion calculation condition and the initial bolt load data group to obtain the load distribution data of the bolt group; processing the load distribution data of the bolt group according to the set value to obtain the target load data of the bolt group. Through the present invention, only the axial force of a limited number of bolts needs to be measured to inversely calculate the stress conditions of all bolts, thereby greatly reducing the monitoring cost, and is suitable for wind turbine monitoring. At the same time, it also provides a data basis for the evaluation of the fatigue state of the bolt itself and the reverse calculation of the overall load state of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0043] Figure 1 It is a flow chart of a method for measuring the axial force of a fan bolt group based on limited monitoring points provided by the present invention;

[0044] Figure 2 It is a schematic diagram of the arrangement of the flange bolt group change and the ultrasonic axial force measurement sensor provided by the present invention;

[0045] Figure 3 It is the bolt axial force data collected by the eight-channel axial force system provided by the present invention;

[0046] Figure 4 The axial force data provided by the present invention is the axial force data for interpolation inversion spliced ​​from the measured axial force data;

[0047] Figure 5 It is a sinc function used to filter out unnecessary components in the inversion process provided by the present invention;

[0048] Figure 6 is the reconstructed data obtained by using the inversion algorithm provided by the present invention;

[0049] Figure 7It is the load data of all bolts of the flange obtained according to the bolt number and position;

[0050] Figure 8 It is the reconstructed data under abnormal load obtained by using the inversion algorithm;

[0051] Fig. 9 It is the load data of all bolts of the flange under abnormal load obtained according to the bolt number and position;

[0052] Fig.10 It is a logic block diagram of the fan bolt group axial force measurement system at limited monitoring points provided by the present invention. DETAILED DESCRIPTION

[0053] 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.

[0054] Based on the force law of the bolt group, the present invention uses the data of a limited number of monitoring points and obtains the load data of a whole circle of bolts on the flange through an inversion method, thereby greatly reducing the safety monitoring cost of the bolts and making it suitable for fan monitoring.

[0055] refer to Figure 1 , Figure 1 A schematic flow chart of a method for measuring the axial force of a fan bolt group based on limited monitoring points provided by the present invention.

[0056] Specifically, Figure 1 As shown, the method for measuring the axial force of a fan bolt group based on limited monitoring points includes the following steps:

[0057] Step S101: a limited number of ultrasonic axial force measurement sensors are set according to a target installation method.

[0058] The finite number of ultrasonic axial force measurement sensors includes: N ultrasonic axial force measurement sensors.

[0059] In an embodiment of the present invention, setting a limited number of ultrasonic axial force measurement sensors according to the target installation method includes: determining a bolt group to be monitored; the number of bolts in the bolt group is M; N ultrasonic axial force measurement sensors are evenly spaced on the N bolts, and the first ultrasonic axial force measurement sensor is set on the first bolt in the M bolt group; wherein N and M are integers, and N≤M.

[0060] Specifically, the flange bolt group to be monitored is selected, wherein the number of bolt groups is M, and the bolt numbers are numbered B i Then, N ultrasonic axial force measurement sensors are evenly spaced and arranged on the N bolts. The N ultrasonic axial force measurement sensors are numbered P, i (i=1,2,...,N), where the first sensor P1 is arranged on the B1 bolt.

[0061] Step S102: collecting measurement signals of N ultrasonic axial force measurement sensors to obtain an initial bolt load data set.

[0062] In an embodiment of the present invention, collecting measurement signals of N ultrasonic axial force measurement sensors to obtain an initial bolt load data group includes: collecting and recording measurement signals of N ultrasonic axial force measurement sensors to obtain N bolt load data; subtracting the initial installation preload of the bolt from the N bolt load data to obtain the initial bolt load data group.

[0063] Specifically, the bolt load data collected by N ultrasonic axial force measurement sensors are recorded, and the preload force during bolt installation (i.e., the initial installation preload force of the bolt) is subtracted to obtain the initial bolt load data set. The initial bolt load data set can be expressed as:

[0064] Fg0=[F1,F2,...,F N ]-F0;

[0065] Fg0 is the initial bolt load data set, F1, F2, ..., F N They are P1, P2, ..., P N Collected bolt load data.

[0066] Step S103: construct inversion calculation conditions.

[0067] In an embodiment of the present invention, constructing the inversion calculation conditions includes: splicing N1 initial bolt load data groups to obtain a first load data group; constructing an interpolation sequence array; using the sinc function to construct an interpolation array; setting an interpolation data group for storing interpolated bolt data. Here, splicing N1 initial bolt load data groups means connecting N1 initial bolt load data groups together. For example, an array length N = 5, and the load data group is [1,2,3,4,5]; connect N1 such load arrays together, if N1 = 3, then the spliced ​​data group becomes [1,2,3,4,5,1,2,3,4,5,1,2,3,4,5].

[0068] Specifically, N1 initial bolt load data sets are spliced ​​to obtain a first load data set. The first load data set can be expressed as:

[0069] Fg1=[Fg0,Fg0...,Fg0];

[0070] Fg1 is the first load data group, wherein the length of Fg1 is T0=N*N1.

[0071] Construct a sequence number array for interpolation. Let T = M*N1, then the sequence number array is t = [-T+1, -T+1, ..., T-1].

[0072] The interpolation array is constructed using the sinc function, and the interpolation array is: h = sinc (t / M*N). This function can filter out data components that are not suitable for interpolation.

[0073] Set the data group to store the interpolated bolt data. The interpolated data group can be expressed as:

[0074] Fg2=[0,0,...,0];

[0075] Fg2 is the interpolated data group, and the length of Fg2 is T=M*N1.

[0076] Step S104: performing cyclic interpolation based on the inverse calculation conditions and the initial bolt load data group to obtain load distribution data of the bolt group.

[0077] In the embodiment of the present invention, performing cyclic interpolation based on the inverse calculation conditions and the initial bolt load data group to obtain the load distribution data of the bolt group includes the following steps:

[0078] Step S01: when the cycle amount is 0, the offset is obtained by calculating according to the length of the sequence number array, the sequence number array, the number of bolts in the bolt group, and the number of ultrasonic axial force measurement sensors;

[0079] Step S02: performing calculations according to the interpolation array, the offset, the first load data set and the interpolated data set to obtain an interpolated bolt load data set;

[0080] Step S03: Repeat steps S01 to S02 according to the set cycle amount to obtain the load distribution data of the bolt group.

[0081] Specifically, after completing the construction of the reaction calculation conditions in step S103, the cyclic interpolation can be started. Specifically:

[0082] When the loop index = 0, calculate the offset:

[0083] t_shift=t(T-index*M / N:2T-index*M / N);

[0084] The bolt load array after calculation and interpolation is:

[0085] Fg2=Fg2+Fg1(index+1)*h(t_shift);

[0086] Set the cycle index = 1, 2....(T-1), repeat the above steps, and finally obtain the bolt load distribution data Fg2.

[0087] Step S105: Process the load distribution data of the bolt group according to the set value to obtain the target load data of the bolt group.

[0088] In an embodiment of the present invention, the load distribution data of the bolt group is processed according to the set value to obtain the target load data of the bolt group, including: according to the set value, the target load data of the bolt group is obtained by taking out the load distribution data of the bolt group according to the sequence number.

[0089] Optionally, in the embodiment of the present invention, the value is set to dx. dx is rounded to N1 / 2, and the final load data of the bolt group is taken out from the Fg2 matrix according to the sequence number, that is, the target load data of the bolt group is F B , F B The values ​​of are as follows:

[0090] F B =Fg2(dx*M+1:dx*M+M)+F0;

[0091] In the embodiment of the present invention, N is greater than or equal to 8; N1 is an odd number, and the minimum value of N1 is 5. It should be noted that the larger the value of N, the better, wherein the maximum value of N is N=M, and the minimum value is 8.

[0092] Furthermore, in an embodiment of the present invention, the method for measuring the axial force of a wind turbine bolt group based on limited monitoring points also includes: collecting real-time monitoring signals of N ultrasonic axial force measurement sensors; reconstructing data based on the real-time monitoring signals to obtain real-time load data of the bolt group; comparing the target load data of the bolt group with the real-time load data of the bolt group; and judging whether the bolt load in the bolt group is abnormal based on the comparison results.

[0093] The present invention is described below with reference to a specific embodiment.

[0094] Embodiment 1:

[0095] Step A1: A wind turbine tower flange bolt group has 64 bolts, numbered B1, B2, ..., B64. An eight-channel ultrasonic axial force monitoring system is arranged at the ends of the bolts in sequence. The eight sensors are numbered P1, P2, ..., P8, and the P1 sensor is arranged on the B1 bolt. The other sensors are arranged at equal intervals (i.e., arranged at equal intervals along the circumference). Figure 2 As shown in the figure, the initial installation preload of the bolt is set to 550KN.

[0096] Step A2: When the fan is subjected to a certain wind load, the axial force transmitted to the bolt is measured by the ultrasonic sensor and recorded as F = [593.3KN, 598.2KN, 575.0KN, 537.1KN, 506.7KN, 501.7KN, 525.0KN, 562.9KN], and plotted into a dot graph, such as Figure 3 As shown, the initial installation preload force is subtracted from the recorded data, that is, Fg0=F-F0 is recorded for subsequent interpolation operations.

[0097] Step A3: Concatenate 5 sets of repeated Fg0 to obtain an array Fg1, whose length is T0=N*N1=40. Draw a dot graph, as shown in the figure below: Figure 4 As shown;

[0098] Step A4: Set T = M*N1 = 320, construct the serial number array t = [-319, -318, ..., 319] for interpolation, and then use the sinc function to construct the interpolation array, h = sinc (t / 8), and then plot it as follows Figure 5 As shown, this function is used to filter out data components that are not suitable for interpolation;

[0099] Step A5: Set the array Fg2 for storing interpolated bolt data to [0, 0, ..., 0], and the length of Fg2 is T = 320;

[0100] Step A6: Start the loop interpolation. When the loop index = 0, calculate the offset:

[0101] t_shift=t(T-index*8:2T-index*8);

[0102] The bolt load array after calculation and interpolation is:

[0103] Fg2=Fg2+Fg1(index+1)*h(t_shift);

[0104] Step A7: Set the cycle index = 1, 2....(T-1), repeat step A6, and finally obtain the bolt load distribution data Fg2 (i.e. the load distribution data of the bolt group) as follows: Figure 6 As shown, we can see that the data located in the center has higher inversion accuracy, while the data located at the edge has a certain inversion error. Therefore, the intermediate data will be taken for further processing. Set dx to N1 / 2, that is, dx = 2, and take out the final load data (that is, target load data) of the bolt group from the Fg2 matrix according to the sequence number:

[0105] FB =Fg2(129:192)+F0;

[0106] Plot the load distribution of the bolt as Figure 7 As shown. Figure 7 The load conditions of all bolts can be seen, and the direction of the wind load at this moment can be determined based on the location of the maximum load, that is, the 8th bolt is bearing the maximum load on the windward side.

[0107] Embodiment 2:

[0108] In the same monitoring scenario, if the load of a bolt is abnormal, the axial force of other bolts will increase, thus causing the monitoring data of the bolts to change. At this time, the recorded eight-channel bolt axial force data is F = [593.3KN, 599.2KN, 585.0KN, 637.1KN, 606.7KN, 511.7KN, 529.0KN, 562.9KN]. Using the solution of the present invention, the reconstructed load data can be obtained as follows: Figure 8 As shown, the data of 64 bolts of the flange are extracted as follows Fig. 9 It can be seen that the distribution form of the bolt load has undergone an obvious change, so the present invention can also be used to determine whether there are bolts with abnormal loads.

[0109] refer to Fig.10 , Fig.10 The present invention provides a logic block diagram of a wind turbine bolt group axial force measurement system based on limited monitoring points. The wind turbine bolt group axial force measurement system based on limited monitoring points can be applied to a wind turbine bolt group axial force measurement method based on limited monitoring points disclosed in an embodiment of the present invention.

[0110] Specifically, Fig.10 As shown, the wind turbine bolt group axial force measurement system based on limited monitoring points includes:

[0111] The setting unit 11 is used to set a finite number of ultrasonic axial force measurement sensors according to a target installation method; the finite number of ultrasonic axial force measurement sensors includes: N ultrasonic axial force measurement sensors.

[0112] The data acquisition unit 12 is used to collect measurement signals of N ultrasonic axial force measurement sensors to obtain an initial bolt load data set.

[0113] The inversion calculation construction unit 13 is used to construct inversion calculation conditions.

[0114] The load distribution calculation unit 14 is used to perform cyclic interpolation based on the inverse calculation conditions and the initial bolt load data group to obtain the load distribution data of the bolt group.

[0115] The target load calculation unit 15 is used to process the load distribution data of the bolt group according to the set value to obtain the target load data of the bolt group.

[0116] Specifically, the specific coordination operation process between the various units in the fan bolt group axial force measurement system based on limited monitoring points can refer to the above-mentioned fan bolt group axial force measurement method based on limited monitoring points, which will not be repeated here.

[0117] In addition, an electronic device of the present invention includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program to implement any of the above methods for measuring the axial force of a wind turbine bolt group based on limited monitoring points. Specifically, according to an embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed by an electronic device and when executed, it executes the above functions defined in the method of the embodiment of the present invention. The electronic device in the present invention can be a terminal such as a notebook, a desktop, a tablet computer, a smart phone, or a server.

[0118] In addition, a storage medium of the present invention stores a computer program thereon, and when the computer program is executed by a processor, any one of the above methods for measuring the axial force of a wind turbine bolt group based on limited monitoring points is implemented. Specifically, it should be noted that the above storage medium of the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0119] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0120] 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.

[0121] 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 the present invention.

[0122] 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.

[0123] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for measuring the axial force of a fan bolt group based on limited monitoring points, characterized in that: The following steps are involved: A finite number of ultrasonic axial force measurement sensors are set according to the target installation method; the finite number of ultrasonic axial force measurement sensors includes: N ultrasonic axial force measurement sensors; Collecting measurement signals of the N ultrasonic axial force measurement sensors to obtain an initial bolt load data set; Structural inversion calculation conditions; Perform cyclic interpolation based on the inverse calculation conditions and the initial bolt load data group to obtain load distribution data of the bolt group; The load distribution data of the bolt group is processed according to the set value to obtain the target load data of the bolt group.

2. The method for measuring the axial force of a fan bolt group based on limited monitoring points according to claim 1 is characterized in that: The method of setting a limited number of ultrasonic axial force measurement sensors according to the target installation method includes: Determine a bolt group to be monitored; the number of bolts in the bolt group is M; N ultrasonic axial force measurement sensors are evenly spaced on N bolts, and the first ultrasonic axial force measurement sensor is arranged on the first bolt in a group of M bolts; wherein N and M are integers, and N≤M.

3. The method for measuring the axial force of a fan bolt group based on limited monitoring points according to claim 1 is characterized in that: The collecting the measurement signals of the N ultrasonic axial force measurement sensors to obtain the initial bolt load data set includes: Collect and record measurement signals of N ultrasonic axial force measurement sensors to obtain N bolt load data; The initial bolt load data set is obtained by subtracting the initial installation pre-tightening force of the bolt from the N bolt load data.

4. The method for measuring the axial force of a fan bolt group based on limited monitoring points according to claim 1 is characterized in that: The structural inversion calculation conditions include: splicing N1 initial bolt load data groups to obtain a first load data group; Construct an interpolation sequence array; Use the sinc function to construct the interpolation array; Sets the interpolated data group that stores the interpolated bolt data.

5. The method for measuring the axial force of a fan bolt group based on limited monitoring points according to claim 4 is characterized in that: The performing cyclic interpolation based on the inverse calculation condition and the initial bolt load data group to obtain the load distribution data of the bolt group comprises the following steps: Step S01: when the cycle amount is 0, the offset is obtained by calculating according to the length of the sequence number array, the sequence number array, the number of bolts in the bolt group, and the number of ultrasonic axial force measurement sensors; Step S02: performing calculation according to the interpolation array, the offset, the first load data group and the interpolated data group to obtain an interpolated bolt load data group; Step S03: Repeat steps S01 to S02 according to the set cycle amount to obtain the load distribution data of the bolt group.

6. The method for measuring the axial force of a fan bolt group based on limited monitoring points according to claim 1 is characterized in that: The processing of the load distribution data of the bolt group according to the set value to obtain the target load data of the bolt group includes: According to the set value, the target load data of the bolt group is obtained by taking out the load distribution data of the bolt group according to the sequence number.

7. The method for measuring the axial force of a fan bolt group based on limited monitoring points according to claim 4 is characterized in that: The N is greater than or equal to 8; the N1 is an odd number, and the minimum value of the N1 is 5.

8. The method for measuring the axial force of a fan bolt group based on limited monitoring points according to any one of claims 1 to 7, characterized in that: The method further comprises: Collecting real-time monitoring signals of the N ultrasonic axial force measurement sensors; Reconstruct data based on the real-time monitoring signal to obtain real-time load data of the bolt group; Comparing the target load data of the bolt group with the real-time load data of the bolt group; Whether the bolt load in the bolt group is abnormal is determined based on the comparison result.

9. A wind turbine bolt group axial force measurement system based on limited monitoring points, applied to the wind turbine bolt group axial force measurement method based on limited monitoring points according to any one of claims 1 to 8, characterized in that: include: A setting unit, used for setting a limited number of ultrasonic axial force measurement sensors according to a target installation mode; The finite number of ultrasonic axial force measurement sensors includes: N ultrasonic axial force measurement sensors; A data acquisition unit, used to collect measurement signals of the N ultrasonic axial force measurement sensors to obtain an initial bolt load data set; An inversion calculation construction unit is used to construct inversion calculation conditions; A load distribution calculation unit, used for performing cyclic interpolation based on the inverse calculation condition and the initial bolt load data group to obtain load distribution data of the bolt group; The target load calculation unit is used to process the load distribution data of the bolt group according to a set value to obtain the target load data of the bolt group.

10. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the method for measuring the axial force of a wind turbine bolt group based on limited monitoring points as described in any one of claims 1 to 7 by calling the computer program stored in the memory.

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