Fan anchor rod damage monitoring method and system

Abstract

The invention belongs to the technical field of wind power fan foundations, and provides a fan anchor rod damage monitoring method and system.The method comprises the steps that firstly, in a three-dimensional model, position information of a preset target sensor, a first sensor, a second sensor, a third sensor and a fourth sensor at initial time and position information after a preset time period are determined; then, according to the position information of the third sensor and the fourth sensor, the section rotation angle of the fan foundation is determined; the curvature radius and curvature of the anchor rod to be measured are obtained according to the position data of the target sensor and the third sensor and the position data of the first sensor and the second sensor; and finally, according to the curvature radius, the curvature and the strain, the axial force, the transverse load and the bending moment are obtained, the damage condition of the anchor rod is judged, the anchor rod is not affected by deeply buried soil, complex stress and other external factors, the anchor rod can be monitored in real time, reliable information can be provided before damage occurs, corresponding reinforcing measures can be taken in time, and the safety of the anchor rod is improved. And the property loss risk is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine foundations, and in particular relates to a method and system for monitoring wind turbine anchor damage. Background Art

[0002] With the development of green buildings and prefabricated buildings, the field of wind turbine foundation construction has developed rapidly. Since the loads borne by the wind turbine foundation mainly include the wind load on the blades and tower, the deadweight of the wind turbine unit and the operating load, it will bear a large horizontal load and vertical load in the actual working process, and there will be a coupling effect between the foundation and the foundation when an earthquake occurs. In order to ensure the sustainable use of wind turbines and avoid unnecessary loss of personnel and property, real-time monitoring of wind turbine foundations is particularly important.

[0003] As an important anchoring component, anchor rods have been widely used in wind turbine foundations. However, during operation, they are deeply buried in the soil, subjected to complex forces and subject to much interference from other external factors. They are highly concealed, resulting in the current monitoring method being unable to monitor the anchor rods in actual projects in real time, and unable to monitor the deformation of anchor rods in real time. As a result, in actual engineering applications, due to insufficient monitoring of the bending deformation of anchor rods, corresponding reinforcement measures cannot be taken in a timely and effective manner before damage occurs, resulting in unnecessary property losses. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a wind turbine anchor damage monitoring method and system. The present invention first determines, in a three-dimensional model, the position information of a preset target sensor, a first sensor, a second sensor, a third sensor and a fourth sensor at an initial time, as well as the position information after a preset time period; then, according to the position information of the third sensor and the fourth sensor at the initial time, as well as the position information after a preset time period, the cross-sectional angle of the wind turbine foundation is determined; when the cross-sectional angle is greater than a set threshold, the curvature radius and curvature of the anchor to be measured are obtained according to the position data of the target sensor and the third sensor, the first sensor and the second sensor after the initial time and the preset time period; finally, according to the curvature radius, the curvature and the strain, the axial force, the lateral load and the bending moment are obtained; the anchor damage is judged according to the axial force, the lateral load and the bending moment, which is not affected by deep burial, complex force and other external factors, and can monitor the anchor in actual engineering in real time.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, the present invention provides a method for monitoring wind turbine anchor damage, comprising:

[0007] A method for monitoring wind turbine anchor failure, comprising:

[0008] Obtain design drawing information and three-dimensional point cloud data of the wind turbine foundation, preset position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor at different positions, and the strain of the anchor rod to be measured;

[0009] A three-dimensional model of the wind turbine foundation is established according to the design drawing information and the three-dimensional point cloud data; in the three-dimensional model, the position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor at the initial time and the position information after a preset time period are determined;

[0010] Determine the cross-sectional rotation angle of the wind turbine foundation according to the position information of the third sensor and the fourth sensor at the initial time and the position information after the preset time period; when the cross-sectional rotation angle is greater than the set threshold, obtain the curvature radius and curvature of the anchor rod to be measured according to the position data of the target sensor and the third sensor, the first sensor and the second sensor after the initial time and the preset time period;

[0011] According to the curvature radius, curvature and strain, the axial force, lateral load and bending moment are obtained; according to the axial force, lateral load and bending moment, the damage of the anchor rod is judged.

[0012] Furthermore, a target sensor is set at the intersection where the central axis of the wind turbine foundation and the center line of the bottom plate thickness intersect; a first sensor and a second sensor are set in sequence from top to bottom on the upper and lower contact surfaces between the anchor rod and the bottom plate along the line connecting the center point of the anchor rod and the center point of the wind turbine foundation to the edge line of the anchor rod, perpendicular to the center line point and parallel to the axis of the anchor rod; a third sensor is set in the anchor rod at the point where the straight line connecting the center point of the anchor rod and the center point of the wind turbine foundation to the edge line of the anchor rod, perpendicular to the center line point and parallel to the axis of the anchor rod intersects the center line of the plate thickness; a fourth sensor is set at the edge line of the anchor rod with the central axis of the anchor rod as the axis of symmetry with the third sensor.

[0013] Furthermore, a coordinate system is established with the target sensor as the origin and the horizontal direction of the wind turbine foundation as the x-axis, and the angle between the straight line where the third sensor and the fourth sensor are located at the initial time and the straight line where the third sensor and the fourth sensor are located at the preset time in the coordinate system is determined as the cross-sectional angle of the central cross-section of the anchor rod.

[0014] Furthermore, the bending moment is equal to the product of the shear force and the distance between the anchor rod and the bottom plate of the wind turbine foundation divided by a set constant; the shear force is equal to the product of the user's elastic modulus, the section resistance bending moment, the maximum strain representative value and the preset constant, and then divided by the value of the distance between the anchor rod and the bottom plate of the wind turbine foundation.

[0015] Furthermore, the axial force is equal to the product of the strain and the cross-sectional area of ​​the anchor rod; and the strain is equal to the product of the elastic modulus and the maximum strain representative value.

[0016] Furthermore, the basis for judging the damage of anchor bolts based on axial force, lateral load and bending moment is as follows:

[0017]

[0018] N0=πDf m L a ;

[0019] Where D is the diameter of the anchor rod; f m is the interfacial bond strength between the anchor body and the rock and soil; L a is the length of the anchoring section; N u is the ultimate axial force of the anchor rod; A is the cross-sectional area of ​​the anchor rod; W is the bending section coefficient; σ e is the yield strength of the anchor rod; N0, Q0 and M0 are the axial force, bending moment and shear force respectively.

[0020] In a second aspect, the present invention further provides a wind turbine anchor damage monitoring system, comprising:

[0021] The data acquisition module is configured to: obtain design drawing information and three-dimensional point cloud data of the wind turbine foundation, position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor preset at different positions, and the strain of the anchor rod to be measured;

[0022] The three-dimensional model building module is configured to: build a three-dimensional model of the wind turbine foundation according to the design drawing information and the three-dimensional point cloud data; in the three-dimensional model, determine the position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor at the initial time, and the position information after a preset time period;

[0023] The curvature radius and curvature determination module is configured to: determine the cross-sectional rotation angle of the wind turbine foundation according to the position information of the third sensor and the fourth sensor at the initial time and the position information after the preset time period; when the cross-sectional rotation angle is greater than the set threshold, obtain the curvature radius and curvature of the anchor rod to be measured according to the position data of the target sensor and the third sensor, the first sensor and the second sensor after the initial time and the preset time period;

[0024] The monitoring module is configured to: obtain the axial force, lateral load and bending moment according to the curvature radius, curvature and strain; and judge the damage of the anchor rod according to the axial force, lateral load and bending moment.

[0025] In a third aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the wind turbine anchor damage monitoring method described in the first aspect.

[0026] In a fourth aspect, the present invention further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein when the processor executes the program, the steps of the wind turbine anchor damage monitoring method described in the first aspect are implemented.

[0027] In a fifth aspect, the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the wind turbine anchor damage monitoring method described in the first aspect are implemented.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the present invention, firstly, in a three-dimensional model, the position information of a preset target sensor, a first sensor, a second sensor, a third sensor and a fourth sensor at an initial time, as well as the position information after a preset time period, are determined; then, according to the position information of the third sensor and the fourth sensor at the initial time, as well as the position information after a preset time period, the cross-sectional rotation angle of the wind turbine foundation is determined; when the cross-sectional rotation angle is greater than a set threshold value, the curvature radius and the curvature of the anchor rod to be tested are obtained according to the position data of the target sensor and the third sensor, the first sensor and the second sensor after the initial time and the preset time period; finally, according to the curvature radius, the curvature and the strain, the axial force, the lateral load and the bending moment are obtained; the damage condition of the anchor rod is judged according to the axial force, the lateral load and the bending moment, which is not affected by deep burial, complex force and interference from other external factors, and can monitor the anchor rods in actual projects in real time, provide reliable information before damage occurs, so as to make corresponding reinforcement measures in time, thereby reducing the risk of property loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0031] Figure 1 is a flow chart of the method of embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the anchor rod structure of Example 1 of the present invention;

[0033] Figure 3 This is a detailed diagram of the anchor rod structure of Example 1 of the present invention;

[0034] Figure 4 This is the anchor rod arrangement diagram of Example 1 of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0037] Embodiment 1:

[0038] The present embodiment provides a method for monitoring the damage of wind turbine anchor rods. First, the design drawing information and three-dimensional point cloud data of the wind turbine foundation are obtained, and a three-dimensional model of the wind turbine foundation is constructed based on the design drawing information of the wind turbine foundation and the three-dimensional point cloud data; the position information of each sensor node at different times is obtained according to the three-dimensional model; wherein two specific measuring anchor rods are grouped as a group and respectively installed on the edge of the beam-slab wind turbine foundation, and each group of anchor rods to be measured is a measuring unit; a target sensor is set at the intersection of the central axis of the wind turbine foundation and the center line of the plate thickness; a sensor is set at each specific measuring anchor rod of each group The upper and lower contact surfaces of the rod and the plate are along the line connecting the center point of the anchor rod and the center point of the wind turbine foundation to the edge line of the specific measuring anchor rod. The straight lines perpendicular to the center point and parallel to the axis of the specific measuring anchor rod are the first sensor and the second sensor from top to bottom; the third sensor is set in each group of each specific measuring anchor rod, where the point where the straight line perpendicular to the center point and parallel to the axis of the specific measuring anchor rod intersects with the center line of the plate thickness; the fourth sensor is set with the center axis of the specific measuring anchor rod as the axis of symmetry with the third sensor and located on the edge line of the specific measuring anchor rod. Then, in the initial time period, take each group of specific measuring anchor rods as a unit, take the target sensor as the origin, the target sensor and the third sensor (fourth sensor) as the x-axis and the central axis of the wind turbine foundation as the y-axis to obtain the vertical coordinate data of the target sensor and the third sensor, the second sensor and the first target sensor, and the third sensor and the fourth sensor, and read the above data values ​​respectively; read the above coordinate data again in a preset time period; measure the cross-sectional rotation angle of the wind turbine foundation by the third sensor and the fourth sensor, and determine whether the cross-sectional rotation angle is greater than the dynamic threshold. If the cross-sectional rotation angle is greater than the dynamic threshold, calculate the curvature radius and curvature of the specific anchor rod to be measured in the preset time period based on the position data of the target sensor and the third sensor, the first sensor and the second sensor read in the initial time period and the preset time period; calculate the axial force, lateral load and bending moment of each cross section after measuring the strain through the fiber grating, and record and save the above data. If the specified value is exceeded, the system will sound an alarm and give the specific damage location. The specific steps of the method are:

[0039] S1. Obtain the design drawings of the wind turbine foundation and collect the three-dimensional point cloud data of the wind turbine foundation during the construction process; after obtaining the design drawings and three-dimensional point cloud data, use BIM technology to construct a three-dimensional model of the wind turbine foundation.

[0040] S2. Processing of monitoring equipment:

[0041] In this embodiment, for the beam-slab wind turbine foundation, two specific measuring anchor rods are installed between each adjacent beam at the outer edge of the bottom plate of the wind turbine foundation. The specific measuring anchor rods are wrapped with three fiber gratings pasted at equal intervals along the axial direction of the anchor rod, and the surrounding fiber gratings are distributed at the midpoint of the specific measuring anchor rod anchored on the bottom plate, marked as D m , where n is the specific survey anchor number.

[0042] Optionally, during the construction of the wind turbine foundation, point cloud data is collected, and specific measuring anchors are arranged between each adjacent beam at the edge of the wind turbine foundation bottom plate. The specific measuring anchors are made by pasting fiber gratings on the surface of the anchor along the longitudinal direction of the anchor axis, wrapping the fiber gratings around the center of the anchor, and then wrapping them with a stainless steel shell. Two adjacent specific measuring anchors are taken as a unit and numbered clockwise.

[0043] It should be noted that during the construction process, not only point cloud data must be collected, but also sensors and specific measurement anchors must be installed, and then the soil must be backfilled.

[0044] S3. The construction of the wind turbine foundation is completed and a three-dimensional building model is established, which is recorded as the initial time t0. At the initial time, the coordinate information s0, s1, s2, s3 and s4 of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor are read respectively with the target sensor as the origin, and recorded and saved, where the coordinates take the horizontal direction as the x-axis.

[0045] S4. Within the preset time period t1, read the position information s of the target sensor, the first sensor, the second sensor, the third sensor, and the fourth sensor again. ’ 0,s ’ 1.s ’ 2.s ’ 3 and s ’ 4. Read and save.

[0046] S5. Take the target sensor as the origin and determine the length of the initial time s3s4 and the preset time s in the coordinate system of the horizontal x-axis of the wind turbine foundation. ’ 3s ’ 4 length; extend s3s4 and s ’ 3s ’ 4The length of the two line segments, through s3s4 and s ’ 3s ’ The angle between the two line segments 4 gives the cross-sectional rotation angle of the central cross section of the anchor rod, which is denoted as β1.

[0047] The cross-sectional rotation angle is recorded and stored, and sent to the computer; if the cross-sectional rotation angle β1 does not exceed the threshold, the relevant contents in steps S4 to S5 are repeated, that is, after a preset time is recorded as t2, the cross-sectional rotation angle β2 is calculated again according to the above process, and so on; if the cross-sectional rotation angle β2 exceeds the threshold, it is determined that the wind turbine foundation settlement exceeds the specified range and the next step of analysis and calculation is carried out.

[0048] S6. When the cross-section rotation angle exceeds the threshold, the shear deformation and axial force of the anchor center are monitored first. The specific process is to calculate the horizontal displacement s of the center point of the specific measurement anchor from the initial time period to the preset time period through the program. ’ 3s ’ 0-s3s0, the length is recorded as R2; at this time, let the radius of curvature be R, the curvature be θ, θ ’ is half of the curvature θ. The Pythagorean theorem can be used to solve the equations:

[0049]

[0050] Wherein, L is the distance between the specific measuring anchor rod and the bottom plate of the wind turbine foundation; R1 is the distance from the center of the circle to the initial time of the third sensor.

[0051] By solving the equations together, we can find the values ​​of the radius of curvature R and R1, and thus θ ’ :

[0052]

[0053] Thus, the value of the curvature θ is calculated.

[0054] Knowing the curvature θ and the radius of curvature R, the distance L at which the specific measuring anchor is fixed to the wind turbine foundation base plate can be determined:

[0055]

[0056] It should be noted that, in this embodiment, ds n As D1 is a unit, the annotations in each unit do not affect each other, so steps S7 to S10 are described by taking D1 as an example.

[0057] S7. Since the specific measuring anchor is equipped with a fiber Bragg grating, the shear strain of the specific measuring anchor during deformation can be measured, which is denoted as ε1, ε2, ε3, and the axial strain, which is denoted as ε1 ’ , ε2 ’ , ε3 ’ . Measure and store at preset time periods.

[0058] S8. The shear strain and axial strain are transmitted to the computer for calculation. According to the bending deformation theory, it can be obtained that:

[0059]

[0060] In the formula,

[0061] From formula (1), we can get:

[0062]

[0063]

[0064] Among them, ds1, ds2, and ds3 represent the positions 1, 2, and 3 of the grating installation in D1 respectively. After the anchor rod is bent, the longitudinal length change value α of this position is the angle of the grating 1 rotated clockwise to the shear direction.

[0065] Substituting the curvature radius R calculated by formula (3) into (6) to obtain d1, d2, and d3, the maximum strain representative value is calculated according to formula (8):

[0066] If the anchor rod is regarded as a simply supported beam at both ends, the shear force it receives can be regarded as a simply supported beam model under concentrated load, so the mid-span bending moment of the anchor rod is:

[0067]

[0068] Where E is the elastic modulus and W is the section's resistance to bending moment.

[0069] The shear force F acting on the specific measuring anchor rod and the bending moment M at the center point of the anchor rod can be calculated by formula (9)-formula (12) and recorded and stored in the computer.

[0070] S9, read the three fiber Bragg gratings of the specific measurement anchor axial distribution, and read the corresponding values, which are ε'1, ε'2, and ε'3 respectively, and calculate the representative value of its axial strain by formula (8): Substitute into formula (13) and formula (14):

[0071]

[0072] N0=σ·A (14)

[0073] Where E is the elastic modulus. The axial force N0 of the anchor is calculated, recorded and stored in the computer.

[0074] S10. The shear force, bending moment and axial force of the anchor bolt center point are calculated by the above steps, and then the damage is judged by formula (15) to formula (17):

[0075]

[0076] N0=πDf m L a (17)

[0077] Where D is the diameter of the anchor rod; f m is the interfacial bond strength between the anchor body and the rock and soil; L a is the length of the anchoring section; N u is the ultimate axial force of the anchor rod; A is the cross-sectional area of ​​the anchor rod; W is the bending section coefficient; σ e is the yield strength of the anchor rod; N0, Q0, and M0 are the axial force, bending moment, and shear force at a certain point, respectively. Since only the shear force and bending moment at the center point of the anchor rod are measured in this embodiment, Q0 and M0 are recorded as the shear force and bending moment values ​​at the center point.

[0078] The obtained axial force, shear force, and bending moment are respectively substituted into formula (15)-formula (17). If formula (15)-formula (17) are satisfied, the next preset time cycle is entered until it is no longer satisfied. If any formula in formula (15)-formula (17) is not satisfied, it is regarded as anchor failure, and an alarm is transmitted to the client and displayed in the three-dimensional model.

[0079] And during the destruction period, the initial time s3s4 and the preset time s will be measured again ’ 3s ’ After the length of 4, measure the moment of failure and the inclination angle of the wind turbine foundation.

[0080] Embodiment 2:

[0081] Based on Example 1, this embodiment provides a method for monitoring the damage of wind turbine anchor rods. During the construction of the wind turbine foundation, point cloud data is collected, and a specific measuring anchor rod is arranged in the middle of each adjacent beam at the edge of the wind turbine foundation bottom plate. The above-mentioned specific measuring anchor rod is a fiber Bragg grating attached to the surface of the anchor rod along the longitudinal direction of the anchor rod axis, and the fiber Bragg grating is wrapped around the center point of the anchor rod, and then wrapped with a stainless steel shell. Two adjacent specific measuring anchor rods are taken as a unit and numbered clockwise.

[0082] After installing the above-mentioned specific measuring anchor rods, sensors are arranged at specific positions of the wind turbine foundation, and the positions include: the target sensor is set at the intersection of the central axis of the wind turbine foundation and the center line of the plate thickness; the first sensor and the second sensor are set from top to bottom along the line connecting the center point of the anchor rod and the center point of the wind turbine foundation to the edge line of the specific measuring anchor rod, and the straight line perpendicular to the center point and parallel to the axis of the specific measuring anchor rod is set; the third sensor is set at the point where the straight line perpendicular to the center point and parallel to the axis of the specific measuring anchor rod intersects with the center line of the plate thickness in each group of specific measuring anchor rods; the fourth sensor is set at the edge line of the specific measuring anchor rod with the central axis of the specific measuring anchor rod as the axis of symmetry with the third sensor. After arranging the above-mentioned sensors, the soil is backfilled and the next measurement is carried out.

[0083] The design drawings of the wind turbine foundation are obtained and three-dimensional cloud data are collected, characteristic information of the wind turbine foundation is extracted from the design drawings of the wind turbine foundation and the collected point cloud data, and a three-dimensional model of the wind turbine foundation is constructed according to the characteristic information; and the position information of the sensor is marked at the corresponding position of the model, and the coordinate system of the wind turbine foundation is constructed with the target sensor as the origin and the straight line where the target sensor and the third sensor are located, that is, the center line of the bottom plate of the wind turbine foundation, as the x-axis.

[0084] According to the wind turbine foundation coordinate system, at the initial time, that is, when the construction is completed and the equipment is operating normally, the coordinate information of each sensor is read and recorded and stored; then, the position coordinate information of each sensor is read and stored again within a preset time period.

[0085] According to the coordinate information of the third sensor and the fourth sensor at the initial time and the preset time, the cross-sectional angle of the surface on which they are located is calculated, and the cross-sectional angle of each specific measurement anchor rod is transmitted to the computer to determine whether it exceeds the threshold. If not, the above operation is repeated in the next preset time; if it exceeds the threshold, the stress state of the anchor rod is monitored.

[0086] Optionally, based on the measurement value exceeding the threshold range, the coordinate information of the target sensor, the first sensor, the second sensor, and the third sensor at the initial time and the preset time are read to calculate the radius of curvature and the curvature of the central section of the anchor rod when the anchor rod is bent and deformed. Then, the shear strain at the center point of the anchor rod and the axial strain of the anchor rod are measured respectively by fiber grating, and the shear force, bending moment, and axial force of the specific measurement anchor rod are calculated by finding the representative values ​​of the axial strain and the shear strain.

[0087] Optionally, based on the calculated value, a discriminant formula is substituted to determine whether damage has occurred. If no damage has occurred, the above content will be repeated at the next preset time. If damage has occurred, the damaged anchor rod and the type of damage will be displayed in the three-dimensional building model, and an alarm will be sent to the client to issue a warning. The above-mentioned tilt state of the wind turbine foundation will be repeated to provide a scientific basis for the subsequent maintenance and reinforcement of the wind turbine foundation.

[0088] Optionally, the overturning state of the wind turbine foundation and the stress on the anchor rods of the wind turbine foundation can be reflected through reinforcement parts. Here, it refers to specific measuring anchor rods installed on the bottom plate of the wind turbine foundation, which not only play the role of reinforcing the wind turbine foundation but also can monitor the stress on the anchor rods in real time. The stress state and even damage of the anchor rods can reflect the stress state and overturning degree of the wind turbine foundation.

[0089] By combining point cloud data with a three-dimensional model based on the wind turbine foundation design drawings, and placing sensors at specific locations during the construction process and collecting point cloud data, it is possible to monitor and collect data during the construction process, visualize the wind turbine foundation construction process and the monitoring process, and facilitate visual management of the wind turbine foundation in the later stage; and construct a coordinate system for the wind turbine based on the layout of the sensors.

[0090] The axial force, shear force, and bending moment of each specific measured anchor rod on the foundation of the wind turbine are obtained by calculation and transmitted to the computer for damage judgment, providing reliable data support for wind turbine damage. By processing the data of the third and fourth sensors at the initial time and the preset time, the cross-sectional rotation angle of the center cross section of the anchor rod is obtained, and the average value of each unit is calculated and transmitted to the computer to determine whether it is a threshold value. If it does not exceed the threshold value, the above operation is repeated; if it exceeds the threshold value, the next step of calculation and judgment is performed. By reading the position information of the target sensor and the first sensor, the second sensor, and the third sensor at the initial time and the preset time, the axial force, shear force, and bending moment of the anchor rod in the preset time period are calculated, and the above data are transmitted to the computer. And judge whether it is damaged according to the discriminant. It should be noted that if any one of the discriminants is met, it is considered to be damaged, and the data will be transmitted to the client and an alarm will be issued; if all discriminants are not met, the above operation will be repeated in the next preset time period. When a specific measuring anchor is damaged, the damage point will be displayed in the three-dimensional model of the wind turbine foundation and the damage type will be marked. The previous operation will be repeated to read the coordinate information of the third sensor and the fourth sensor in the damage time period and the initial time period, and the cross-sectional rotation angle of the anchor center will be obtained by calculation. The average value of each unit will be calculated and transmitted to the computer, thereby reflecting the overturning state of the wind turbine foundation.

[0091] Embodiment 2:

[0092] This embodiment provides a wind turbine anchor damage monitoring system, including:

[0093] The data acquisition module is configured to: obtain design drawing information and three-dimensional point cloud data of the wind turbine foundation, position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor preset at different positions, and the strain of the anchor rod to be measured;

[0094] The three-dimensional model building module is configured to: build a three-dimensional model of the wind turbine foundation according to the design drawing information and the three-dimensional point cloud data; in the three-dimensional model, determine the position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor at the initial time, and the position information after a preset time period;

[0095] The curvature radius and curvature determination module is configured to: determine the cross-sectional rotation angle of the wind turbine foundation according to the position information of the third sensor and the fourth sensor at the initial time and the position information after the preset time period; when the cross-sectional rotation angle is greater than the set threshold, obtain the curvature radius and curvature of the anchor rod to be measured according to the position data of the target sensor and the third sensor, the first sensor and the second sensor after the initial time and the preset time period;

[0096] The monitoring module is configured to: obtain the axial force, lateral load and bending moment according to the curvature radius, curvature and strain; and judge the damage of the anchor rod according to the axial force, lateral load and bending moment.

[0097] The working method of the system is the same as the wind turbine anchor damage monitoring method in Example 1, and will not be repeated here.

[0098] Embodiment 3:

[0099] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the wind turbine anchor damage monitoring method described in Example 1 and / or Example 2 are implemented.

[0100] Embodiment 4:

[0101] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, the steps of the wind turbine anchor damage monitoring method described in Example 1 are implemented.

[0102] Embodiment 5:

[0103] This embodiment provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the wind turbine anchor damage monitoring method described in Example 1 are implemented.

[0104] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A method for monitoring wind turbine anchor failure, characterized in that: include: Obtain design drawing information and three-dimensional point cloud data of the wind turbine foundation, preset position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor at different positions, and the strain of the anchor rod to be measured; Establish a 3D model of the wind turbine foundation based on the design drawing information and 3D point cloud data; In the three-dimensional model, determining position information of the target sensor, the first sensor, the second sensor, the third sensor, and the fourth sensor at an initial time, and position information after a preset time period; Determine the cross-sectional rotation angle of the wind turbine foundation according to the position information of the third sensor and the fourth sensor at the initial time and the position information after a preset time period; When the cross-sectional rotation angle is greater than a set threshold, the curvature radius and curvature of the anchor rod to be measured are obtained according to the position data of the target sensor and the third sensor, the first sensor and the second sensor after the initial time and the preset time period; According to the curvature radius, curvature and strain, the axial force, lateral load and bending moment are obtained; according to the axial force, lateral load and bending moment, the damage of the anchor rod is judged.

2. A wind turbine anchor failure monitoring method as claimed in claim 1, characterized in that: A target sensor is set at the intersection where the central axis of the wind turbine foundation and the center line of the bottom plate thickness intersect; a first sensor and a second sensor are set in sequence from top to bottom on the upper and lower contact surfaces between the anchor rod and the bottom plate along the line connecting the center point of the anchor rod and the center point of the wind turbine foundation to the edge line of the anchor rod, perpendicular to the center line point and parallel to the axis of the anchor rod; a third sensor is set in the anchor rod at the point where the straight line connecting the center point of the anchor rod and the center point of the wind turbine foundation to the edge line of the anchor rod, perpendicular to the center line point and parallel to the axis of the anchor rod intersects the center line of the plate thickness; a fourth sensor is set at the edge line of the anchor rod with the central axis of the anchor rod as the axis of symmetry with the third sensor.

3. A wind turbine anchor failure monitoring method as claimed in claim 1, characterized in that: A coordinate system is established with the target sensor as the origin and the horizontal direction of the wind turbine foundation as the x-axis. The angle between the straight line where the third sensor and the fourth sensor are located at the initial time and the straight line where the third sensor and the fourth sensor are located at the preset time in the coordinate system is determined as the cross-sectional angle of the central cross-section of the anchor rod.

4. A wind turbine anchor failure monitoring method as claimed in claim 1, characterized in that: The bending moment is equal to the product of the shear force and the distance between the anchor rod and the bottom plate of the wind turbine foundation divided by a set constant; the shear force is equal to the product of the user's elastic modulus, the section resistance bending moment, the maximum strain representative value and the preset constant, and then divided by the value of the distance between the anchor rod and the bottom plate of the wind turbine foundation.

5. A wind turbine anchor failure monitoring method as claimed in claim 4, characterized in that: The axial force is equal to the product of the strain and the cross-sectional area of ​​the anchor rod; the strain is equal to the product of the elastic modulus and the representative value of the maximum strain.

6. A wind turbine anchor failure monitoring method according to claim 1, characterized in that: The basis for judging the damage of anchor bolts according to axial force, lateral load and bending moment is: Where D is the diameter of the anchor rod; f m is the interfacial bond strength between the anchor body and the rock and soil; L a is the length of the anchoring section; N u is the ultimate axial force of the anchor rod; A is the cross-sectional area of ​​the anchor rod; W is the bending section coefficient; σ e is the yield strength of the anchor rod; N0, Q0 and M0 are the axial force, bending moment and shear force respectively.

7. A wind turbine anchor failure monitoring system, characterized in that: include: The data acquisition module is configured to: obtain design drawing information and three-dimensional point cloud data of the wind turbine foundation, position information of the target sensor, the first sensor, the second sensor, the third sensor and the fourth sensor preset at different positions, and the strain of the anchor rod to be measured; The three-dimensional model building module is configured to: build a three-dimensional model of the wind turbine foundation according to the design drawing information and the three-dimensional point cloud data; In the three-dimensional model, determining position information of the target sensor, the first sensor, the second sensor, the third sensor, and the fourth sensor at an initial time, and position information after a preset time period; The curvature radius and curvature determination module is configured to: determine the cross-sectional rotation angle of the wind turbine foundation according to the position information of the third sensor and the fourth sensor at the initial time and the position information after a preset time period; When the cross-sectional rotation angle is greater than a set threshold, the curvature radius and curvature of the anchor rod to be measured are obtained according to the position data of the target sensor and the third sensor, the first sensor and the second sensor after the initial time and the preset time period; The monitoring module is configured to: obtain the axial force, lateral load and bending moment according to the curvature radius, curvature and strain; and judge the damage of the anchor rod according to the axial force, lateral load and bending moment.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the wind turbine anchor damage monitoring method as described in any one of claims 1 to 6 are implemented.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the steps of the wind turbine anchor damage monitoring method as described in any one of claims 1-6 are implemented.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the wind turbine anchor damage monitoring method as described in any one of claims 1 to 6 are implemented.

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