A device for monitoring corrosion and early warning of dynamic response failure of offshore wind turbine tower

Abstract

The application provides a kind of offshore wind turbine tower corrosion monitoring and dynamic response fault early warning device, it is related to wind power generation operation and maintenance equipment technical field.The ultrasonic sensor device measures the thickness data information of wind turbine tower, the data acquisition card temporarily stores the thickness data, the multi-channel signal preprocessing module pre-processes the thickness data information, the data transmission unit transmits the thickness data information obtained by each ultrasonic sensor device to the corrosion monitoring server in the splash zone, the first atmospheric zone, the second atmospheric zone and the cabin, and the corrosion monitoring server processes the obtained thickness data information to monitor corrosion and dynamically respond to fault early warning in real time.During the process of real-time corrosion monitoring and dynamic response fault early warning, the disturbance measurement result caused by the change of the external environment of the wind turbine tower is avoided;The situation that the degree of rust layer surface peeling is taken as a random disturbance and cannot be accurately predicted is avoided, and the measurement result error is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power operation and maintenance equipment, and particularly relates to a device for monitoring corrosion of a tower of an offshore wind turbine and early warning of dynamic response failure. BACKGROUND

[0002] Corrosion of a tower of a wind turbine by seawater and salt mist is one of main factors affecting structural safety of offshore wind power equipment, and the corrosion of the tower has a great influence on overall dynamic characteristics of the wind turbine, and the tower also has a serious safety risk under extreme loads before the corrosion degree of the tower reaches a margin allowance.

[0003] In the prior art, the following defects exist in the corrosion monitoring of the tower of the wind turbine: on the one hand, the measurement result is disturbed by environmental changes; on the other hand, the degree of surface peeling of the corrosion layer is sensitive, and the degree of surface peeling of the corrosion layer as a random disturbance cannot be accurately predicted, resulting in a large error of the measurement result.

[0004] Therefore, the above technical problems need to be further solved. SUMMARY

[0005] The purpose of the embodiment of the present application is to provide a device for monitoring corrosion of a tower of an offshore wind turbine and early warning of dynamic response failure, so as to avoid disturbance of the measurement result caused by changes in the external environment of the tower of the wind turbine in the process of real-time corrosion monitoring and early warning of dynamic response failure, and avoid the case that the degree of surface peeling of the corrosion layer as a random disturbance cannot be accurately predicted, thereby reducing the error of the measurement result.

[0006] To solve the above technical problems, the embodiment of the present application provides the following technical scheme:

[0007] The present application provides a device for monitoring corrosion of a tower of an offshore wind turbine and early warning of dynamic response failure, comprising:

[0008] A magnetic attraction fixing seat unit is arranged on the inner side wall of a splash zone, a first atmospheric zone and a second atmospheric zone of the tower of the wind turbine;

[0009] A measurement unit is arranged in the magnetic attraction fixing seat unit;

[0010] A data transmission unit is arranged in the splash zone, the first atmospheric zone, the second atmospheric zone and a nacelle, the data transmission unit is in communication connection with the measurement unit and transmits thickness data information acquired by the measurement unit;

[0011] An erosion monitoring server is arranged in the cabin and is in communication connection with the data transmission unit, receives the thickness data information acquired by the measurement unit and processes the thickness data information to realize real-time erosion monitoring and dynamic response failure early warning.

[0012] The measurement unit comprises:

[0013] An ultrasonic sensing device is arranged in the interior of the magnetic fixing seat unit and is connected with the magnetic fixing seat unit, and is used for measuring the thickness data information of the fan tower.

[0014] A data acquisition card is arranged in the interior of the magnetic fixing seat unit and is in communication connection with the ultrasonic sensing device, and temporarily stores the thickness data.

[0015] A multi-channel signal preprocessing module is arranged in the interior of the magnetic fixing seat unit and is in signal connection with the data acquisition card, and pre-processes the thickness data information.

[0016] Further, the magnetic fixing seat unit comprises:

[0017] A base is connected with the inner side wall of the fan tower in the splash zone, the first atmospheric zone and the second atmospheric zone, respectively.

[0018] A magnetic assembly is arranged on the base and is connected with the base.

[0019] A shell assembly is connected with the base.

[0020] A distance adjusting assembly is connected with the shell assembly.

[0021] Further, the magnetic assembly comprises:

[0022] A vacuum chuck is arranged on the base close to the side of the fan tower and is adsorbed on the inner side wall of the fan tower.

[0023] A first through hole is arranged on the base and is horizontally through.

[0024] A first tray is arranged in the first through hole close to the side of the fan tower.

[0025] A magnet is arranged in the interior of the vacuum chuck and is close to the side of the fan tower.

[0026] A screw cap is connected with the surface thread of the first through hole through the thread on the outer surface of the side wall of the screw cap, and the screw cap is connected with the first tray when being in the interior of the first through hole.

[0027] a second through hole, surrounded by the base.

[0028] Further, the shell assembly comprises:

[0029] a shell, connected to the base;

[0030] a first shell piece, disposed inside the shell and connected to the shell;

[0031] a first opening part, disposed at an end of the first shell piece close to the base side;

[0032] a third through hole, disposed at the center of the shell.

[0033] Further, the distance adjusting assembly comprises:

[0034] a gasket, slidingly connected to the first shell piece and perpendicular to the first shell piece;

[0035] a screw, passing through the third through hole and connected to the surface of the gasket away from the base side;

[0036] a spring piece, connected to the surface of the gasket away from the screw side, and an end of the spring piece away from the gasket side connected to the ultrasonic sensor device.

[0037] Further, the data transmission unit comprises:

[0038] a first router, disposed on the inner side wall of the wind turbine tower in the splash zone and in communication connection with all the ultrasonic sensor devices in the splash zone;

[0039] a second router, disposed on the inner side wall of the wind turbine tower in the first atmospheric zone and in communication connection with all the ultrasonic sensor devices in the first atmospheric zone, and in communication connection with the first router;

[0040] a third router, disposed on the inner side wall of the wind turbine tower in the second atmospheric zone and in communication connection with all the ultrasonic sensor devices in the second atmospheric zone, and in communication connection with the second router;

[0041] a coordinator, disposed in the nacelle and in communication connection with the third router and the corrosion monitoring server.

[0042] Further, the corrosion monitoring server comprises:

[0043] A data processing module is in communication connection with the coordinator, and according to the data information transmitted by the first router, the second router, the third router and the coordinator, the corrosion thickness of each ultrasonic sensing device node is calculated by the reflection echo time of each ultrasonic sensing device node according to the functional relationship between the tower drum wall thickness and the reflection echo time.

[0044] A storage module is in communication connection with the data processing module.

[0045] A digital twin module is in communication connection with the data processing module, and a tower drum three-dimensional model and a mechanical digital twin model are constructed according to the corrosion thickness of each ultrasonic sensing device node.

[0046] A dynamic response simulation module is in communication connection with the digital twin module, the storage module and a meteorological private network, and according to the meteorological data provided by the meteorological private network, the meteorological conditions in the next two hours are divided into 6 load levels and 4 turbulence levels, and 24 working conditions are divided, and 24 loads preset for predicting the load condition of the wind turbine are built in for the 24 working conditions, the wind turbine is simulated for dynamic response according to the wall thickness loss rate and the load curve, the dynamic response in the next two hours is predicted, and it is judged whether the safety threshold is exceeded, and the machine is stopped when the safety threshold is exceeded.

[0047] A visualization module is in communication connection with the dynamic response simulation module and the digital twin module, and based on the initial tower drum size structure data, the data of the tower drum three-dimensional model and the mechanical digital twin model, and the data in the dynamic response simulation module, a visualization three-dimensional model for specifically displaying the corrosion conditions of the splash zone, the first atmospheric zone and the second atmospheric zone is established, and an alarm is sent to the maintenance personnel when the safety threshold is exceeded.

[0048] Further, 4 turns of 4 ultrasonic sensing devices are arranged in the splash zone, the first atmospheric zone and the second atmospheric zone respectively, and each turn of 4 ultrasonic sensing devices is regarded as a beam element.

[0049] Further, the generation process of the mechanical digital twin model is as follows:

[0050] A statics model of each beam element is established, the stiffness matrix of each beam element is superimposed into a total stiffness matrix to obtain a statics model of the complete tower drum, and inertia force and damping force are introduced to obtain a model of the mechanical digital twin.

[0051] The statics model is as follows:

[0052]

[0053] Wherein, w1 and θ1 are boundary conditions, E' is a slowly varying time function considering corrosion, E' / E = 1-0.857D;

[0054]

[0055]

[0056] …

[0057] The statics model of the complete tower drum is:

[0058]

[0059] The model of the mechanical digital twin is:

[0060]

[0061] Further, the dynamic response simulation module comprises a weight loss rate model describing the corrosion degree of steel material, a weight loss rate model of a splash zone steel structure, an elastic modulus degradation model of a corroded steel material, a section bending stiffness model after corrosion, and a dynamics model of a wind turbine generator;

[0062] The weight loss rate model describing the corrosion degree of steel material is:

[0063] D = [W(0)-W(t)] / W(0)

[0064] In the formula, W(0) is the initial mass of the tower drum; and W(t) is the mass of the splash zone steel structure after corrosion;

[0065] Each beam element is an equal cross-section circular ring, and since the length of each beam element is short, the influence of the taper of the tower drum on the cross-section thereof can be ignored, and at this time, the weight loss rate model of the splash zone steel structure is:

[0066]

[0067] In the formula, l is the length of the splash zone of the tower drum, ρ is the density of the steel material of the tower drum, R is the outer diameter size of the tower drum when the corrosion age is 0 years, r is the inner diameter size of the tower drum, and d t is the corrosion thickness of the splash zone of the tower drum;

[0068] The elastic modulus degradation model of the corroded steel material is:

[0069]

[0070] In the formula, E is the elastic modulus of the steel structure material of the tower drum before corrosion, and E' is the elastic modulus of the steel structure material of the tower drum after corrosion;

[0071] The section bending stiffness model after corrosion is:

[0072]

[0073] The dynamic model of the wind turbine is;

[0074]

[0075] In the formula, {x} is a displacement vector {x} = {x, z, a, q, x tmd} T , is a velocity vector, is an acceleration vector, [M] is a mass matrix, [C] is a damping matrix, [K] is a stiffness matrix, [D] is a load matrix, and {F} is a load vector.

[0076] Compared with the prior art, the offshore wind turbine tower corrosion monitoring and dynamic response fault early warning device provided by the first aspect of the present application, the ultrasonic sensor equipment, the data acquisition card and the multi-channel signal preprocessing module are respectively arranged on the inner side walls of the splash zone, the first atmospheric zone and the second atmospheric zone of the wind turbine tower through the magnetic attraction fixing seat units. The ultrasonic sensor equipment measures the thickness data information of the wind turbine tower, the data acquisition card temporarily stores the thickness data, the multi-channel signal preprocessing module preprocesses the thickness data information, the data transmission unit transmits the thickness data information obtained by each ultrasonic sensor equipment to the corrosion monitoring server in the splash zone, the first atmospheric zone, the second atmospheric zone and the cabin, and the corrosion monitoring server processes the obtained thickness data information to realize real-time corrosion monitoring and dynamic response fault early warning. Thus, on the one hand, the disturbance measurement result caused by the change of the external environment of the wind turbine tower is avoided during the real-time corrosion monitoring and dynamic response fault early warning process; on the other hand, the situation that the rust layer surface spalling degree cannot be accurately predicted as a random disturbance is avoided, thereby reducing the measurement result error. BRIEF DESCRIPTION OF DRAWINGS

[0077] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like reference numerals refer to like elements throughout. In the drawings:

[0078] Figure 1 A partial cross-sectional view of the offshore wind turbine tower corrosion monitoring and dynamic response fault early warning device is schematically shown;

[0079] Figure 2 A schematic view of the data transmission unit is schematically shown;

[0080] Figure 3 A schematic view of the measurement unit is schematically shown;

[0081] Figure 4 schematic diagram of a magnetic attraction fixing seat unit is shown;

[0082] Figure 5 a schematic diagram of a corrosion monitoring server is shown;

[0083] BRIEF DESCRIPTION OF DRAWINGS

[0084] 1, magnetic attraction fixing seat unit; 11, base; 12, magnetic attraction assembly; 121, vacuum chuck; 122, first through hole; 123, rotating cover; 124, magnet piece; 125, first tray; 126, second through hole; 13, shell assembly; 131, shell; 132, first shell piece; 133, third through hole; 134, first opening part; 14, distance adjusting assembly; 141, gasket; 142, spring piece; 143, screw;

[0085] 2, measurement unit; 21, ultrasonic wave sensing device; 22, data acquisition card; 23, multi-channel signal preprocessing module;

[0086] 3, splash zone;

[0087] 4, first atmospheric zone;

[0088] 5, second atmospheric zone;

[0089] 6, engine room;

[0090] 7, corrosion monitoring server; 71, data processing module; 72, storage module; 73, digital twin module; 74, dynamic response simulation module; 75, visualization module;

[0091] 8, coordinator;

[0092] 9, data transmission unit; 91, first router; 92, second router; 93, third router. DETAILED DESCRIPTION

[0093] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art. If not specifically mentioned, the technical means used in the examples are conventional means known to those skilled in the art.

[0094] It should be noted that the technical terms or scientific terms used in the present application should be understood as the general meaning understood by the skilled person in the field to which the present application belongs, unless otherwise specified. In this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. The terms "connected", "connected" and the like should be interpreted broadly, for example, it can be a fixed connection, or a detachable connection, or an integral; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium. The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0095] The embodiment of the present application provides a kind of offshore wind turbine tower corrosion monitoring and dynamic response fault early warning device, combine Figure 1 、 Figure 2 And Figure 3The offshore wind turbine tower corrosion monitoring and dynamic response fault early warning device comprises a magnetic attraction fixing seat unit 1, a measuring unit 2, a data transmission unit 9 and a corrosion monitoring server 7. The measuring unit 2 comprises an ultrasonic sensor device 21, a data acquisition card 22 and a multi-channel signal preprocessing module 23. The magnetic attraction fixing seat unit 1 is arranged on the inner side wall of the splash zone 3, the first atmospheric zone 4 and the second atmospheric zone 5 of the wind turbine tower respectively. The measuring unit 2 is arranged in the magnetic attraction fixing seat unit 1. The data transmission unit 9 is arranged in the splash zone 3, the first atmospheric zone 4, the second atmospheric zone 5 and the nacelle 6 simultaneously. The data transmission unit 9 is in communication connection with the measuring unit 2 and transmits the thickness data information acquired by the measuring unit 2. The corrosion monitoring server 7 is arranged in the nacelle 6. The corrosion monitoring server 7 is in communication connection with the data transmission unit 9, receives the thickness data information acquired by the measuring unit 2 transmitted by the data transmission unit 9 and processes the thickness data information to realize real-time corrosion monitoring and dynamic response fault early warning. The ultrasonic sensor device 21 is arranged in the magnetic attraction fixing seat unit 1 and connected with the magnetic attraction fixing seat unit 1. The ultrasonic sensor device 21 is used for measuring the thickness data information of the wind turbine tower. The data acquisition card 22 is arranged in the magnetic attraction fixing seat unit 1 and connected with the ultrasonic sensor device 21. The data acquisition card 22 temporarily stores the thickness data. The multi-channel signal preprocessing module 23 is arranged in the magnetic attraction fixing seat unit 1 and connected with the data acquisition card 22. The multi-channel signal preprocessing module 23 pre-processes the thickness data information.

[0096] In the embodiment, the ultrasonic sensor device 21, the data acquisition card 22 and the multi-channel signal preprocessing module 23 are arranged on the inner side wall of the splash zone 3, the first atmospheric zone 4 and the second atmospheric zone 5 of the wind turbine tower through the magnetic attraction fixing seat units 1 respectively. The ultrasonic sensor device 21 measures the thickness data information of the wind turbine tower. The data acquisition card 22 temporarily stores the thickness data. The multi-channel signal preprocessing module 23 pre-processes the thickness data information. The data transmission unit 9 transmits the thickness data information acquired by the ultrasonic sensor device 21 to the corrosion monitoring server 7 in the splash zone 3, the first atmospheric zone 4, the second atmospheric zone 5 and the nacelle 6. The corrosion monitoring server 7 processes the acquired thickness data information to realize real-time corrosion monitoring and dynamic response fault early warning. Thus, on the one hand, the disturbance measurement result caused by the change of the external environment of the wind turbine tower is avoided in the process of real-time corrosion monitoring and dynamic response fault early warning. On the other hand, the situation that the degree of rust layer surface peeling cannot be accurately predicted as a random disturbance is avoided, and the measurement result error is reduced.

[0097] The multi-channel signal preprocessing module 23 performs preprocessing on the raw data measured by the ultrasonic sensor 21, including signal amplification, filtering, RMS conversion, and A / D conversion. The signal amplification function is implemented by the AD620 chip circuit, the filtering function by the OP07 chip circuit, and the RMS conversion function by the AD737 chip circuit.

[0098] In a specific embodiment, such as Figure 4 As shown, the magnetic mounting unit 1 includes a base 11, a magnetic assembly 12, a shell assembly 13, and an adjustable distance assembly 14. The base 11 is connected to the inner wall of the wind turbine tower in the splash zone 3, the first atmospheric zone 4, and the second atmospheric zone 5, respectively. The magnetic assembly 12 is mounted on and connected to the base 11. The shell assembly 13 is connected to the base 11. The adjustable distance assembly 14 is connected to the shell assembly 13.

[0099] In this embodiment, the shell assembly 13 is connected to the base 11, so that a sealed space is formed between the inner wall of the wind turbine tower, the base 11, the shell assembly 13 and the pitch adjustment assembly 14 for placing the ultrasonic sensing device 21, the data acquisition card 22 and the multi-channel signal preprocessing module 23.

[0100] The base 11, shell assembly 13, and pitch adjustment assembly 14 are fixed to the inner walls of the splash zone 3, first atmospheric zone 4, and second atmospheric zone 5 of the wind turbine tower by magnetic attachment assembly 12.

[0101] In this invention, the splash zone 3, the first atmospheric zone 4, and the second atmospheric zone 5 of the wind turbine tower are specifically as follows:

[0102] Splash zone 3: The bottom is the base of the tower, and the top is 15m above the average still water level.

[0103] One way to divide the first atmospheric region 4 and the second atmospheric region 5 is as follows: the annual average salt spray deposition rate is 95 mg / m³. -2 d -1 If the altitude is located in the second 1 / 3 region from top to bottom, then the annual average salt spray deposition rate is 95 mg / m². -2 d -1 Above this altitude is Zone 5 of the second atmosphere, with an average annual salt spray deposition rate of 95 mg / m³. -2 d -1 Below this altitude is the first atmospheric region, zone 4.

[0104] Another way to divide the first atmospheric region 4 and the second atmospheric region 5 is as follows:

[0105] The area above splash zone 3 is the atmospheric zone. This atmospheric zone is divided into three equal parts by length. The average annual salt spray deposition rate is 95 mg / m³. -2 d -1If the altitude position is located in the first 1 / 3 region from top to bottom, then the first 1 / 3 region is the second atmospheric region 5, and the second and third 1 / 3 regions are the first atmospheric region 4.

[0106] If the average annual salt spray deposition rate is 95 mg / m³ -2 d -1 If the altitude position is located in the third 1 / 3 region from top to bottom, then the first and second 1 / 3 regions are the second atmospheric region 5, and the third 1 / 3 region is the first atmospheric region 4.

[0107] In a specific embodiment, such as Figure 4 As shown, the magnetic suction assembly 12 includes a vacuum suction cup 121, a first through hole 122, a first tray 125, a magnet 124, a cap 123, and a second through hole 126. The vacuum suction cup 121 is disposed on the base 11 near the wind turbine tower and is attached to the inner wall of the wind turbine tower. The first through hole 122 is horizontally disposed on the base 11. The first tray 125 is disposed within the first through hole 122 near the wind turbine tower. The magnet 124 is disposed inside the vacuum suction cup 121 and near the wind turbine tower. The cap 123 is threaded to the surface of the first through hole 122 via a thread on the outer surface of its sidewall, and the cap 123 is connected to the first tray 125 when inside the first through hole 122. The second through hole 126 is formed by the base 11.

[0108] In this embodiment, the base 11 is adsorbed onto the inner wall of the wind turbine tower using a vacuum suction cup 121, while a magnet 124 located in the first tray 125 magnetically connects to the inner wall of the metal wind turbine tower. This secures the base 11, shell assembly 13, and pitch adjustment assembly 14 more firmly to the inner walls of the splash zone 3, first atmospheric zone 4, and second atmospheric zone 5 of the wind turbine tower. It also facilitates the installation and removal of the base 11, making maintenance easier.

[0109] In a specific embodiment, such as Figure 4 As shown, the shell assembly 13 includes a shell 131, a first shell member 132, a first opening 134, and a third through hole 133. The shell 131 is connected to the base 11. The first shell member 132 is disposed inside the shell 131 and connected to the shell 131. The first opening 134 is located at the end of the first shell member 132 near the base 11. The third through hole 133 is located at the center of the shell 131.

[0110] In this embodiment, the base 11 is connected to the end of the housing 131 near the base 11, and the first opening 134 is sleeved on the base 11.

[0111] In a specific embodiment, such as Figure 4As shown, the distance adjusting assembly 14 includes a gasket 141, a screw 143 and a spring member 142. The gasket 141 is in sliding connection with the first shell member 132 and is perpendicular to the first shell member 132. The screw 143 is connected to the surface of the gasket 141 away from the base 11 through the third through hole 133. The spring member 142 is connected to the surface of the gasket 141 away from the screw 143, and the end of the spring member 142 away from the gasket 141 is connected to the ultrasonic sensing device 21.

[0112] In the embodiment, one end of the ultrasonic sensing device 21 is directly connected to the inner side wall of the fan tower drum after passing through the first opening part 134 and the second through hole 126, and the other end of the ultrasonic sensing device 21 is connected to the spring member 142 in the first shell member 132. During installation, the gasket 141 is moved in the first shell member 132 by rotating the screw 143, and the extension and contraction of the spring member 142 are driven, so that the position of the ultrasonic sensing device 21 is fixed by the spring member 142. Moreover, the actual wall thickness of the tower drum is directly measured by using the ultrasonic sensing device 21, so that the corrosion degree is easily measured.

[0113] In the embodiment, in combination with Figure 1 and Figure 2 , the data transmission unit 9 includes a first router 91, a second router 92, a third router 93 and a coordinator 8. The first router 91 is arranged on the inner side wall of the fan tower drum in the splash zone 3 and is in communication connection with all the ultrasonic sensing devices 21 in the splash zone 3. The second router 92 is arranged on the inner side wall of the fan tower drum in the first atmospheric zone 4 and is in communication connection with all the ultrasonic sensing devices 21 in the first atmospheric zone 4, and the second router 92 is also in communication connection with the first router 91. The third router 93 is arranged on the inner side wall of the fan tower drum in the second atmospheric zone 5 and is in communication connection with all the ultrasonic sensing devices 21 in the second atmospheric zone 5, and the second router 92 is also in communication connection with the second router 92. The coordinator 8 is arranged in the nacelle 6 and is in communication connection with the third router 93 and the corrosion monitoring server 7.

[0114] In the embodiment, each ultrasonic sensing device 21 on the inner side wall of the fan tower drum in the splash zone 3 transmits the obtained raw thickness data information and the preprocessed thickness data information to the second router 92 through the first router 91.

[0115] Each ultrasonic sensing device 21 on the inner side wall of the fan tower drum in the first atmospheric zone 4 transmits the obtained raw thickness data information and the preprocessed thickness data information to the third router 93 through the second router 92, and the second router 92 also transmits the data information in the first router 91 to the third router 93.

[0116] Each ultrasonic sensing device 21 located on the inner side wall of the fan tower drum in the second atmospheric zone 5 will transmit the raw thickness data information and the pre-processed thickness data information obtained by the third router 93 to the corrosion monitoring server 7 through the coordinator 8, and at the same time, the third router 93 will also transmit the data information in the second router 92 to the third router 93.

[0117] The pre-processing of the raw thickness data information obtained by each ultrasonic sensing device 21 through the multi-channel signal pre-processing module 23 is equivalent to pre-processing the raw thickness data information obtained by each ultrasonic sensing device 21. When the tower drum outer wall is corroded, the tower drum outer wall surface is no longer a smooth surface and presents an irregular corrosion surface. The ultrasonic wave in the ultrasonic sensing device 21 will appear a certain degree of diffuse reflection state on the tower drum outer wall surface, which will cause the measured node monitoring tower drum wall thickness data to fluctuate and be disordered, and will bring uncertainty to the wall thickness loss rate obtained by linear fitting. Therefore, it is necessary to pre-process the raw thickness data information obtained by each ultrasonic sensing device 21 through the pre-processing process in the prior art. Since the pre-processing process in the prior art is a mature prior art, in order to avoid redundancy, it will not be described in detail.

[0118] Exemplarily, the fan tower drum wall thickness data measured by the ultrasonic sensing device 21 in the splash zone 3, the first atmospheric zone 4 and the second atmospheric zone 5 is transmitted to the corrosion monitoring server 7 through the data wireless transmission device based on ZigBee wireless transmission technology. By deploying ZigBee wireless terminals in each measurement node of the ultrasonic sensing device 21, the tower drum wall thickness data obtained by each measurement node is fed back to the corrosion monitoring server 7 in real time through the tree topology.

[0119] In specific embodiments, in combination with Figure 1 and Figure 5The corrosion monitoring server 7 comprises a data processing module 71, a storage module 72, a digital twin module 73, a dynamic response simulation module 74 and a visualization module 75. The data processing module 71 is in communication connection with the coordinator 8, and according to the data information transmitted by the first router 91, the second router 92 and the third router 93 and the coordinator 8, the corrosion thickness of each ultrasonic sensor device 21 node is calculated according to the functional relationship between the tower wall thickness and the reflected echo time through the reflected echo time of each ultrasonic sensor device 21 node. The storage module 72 is in communication connection with the data processing module 71. The digital twin module 73 is in communication connection with the data processing module 71, and a tower three-dimensional model and a mechanical digital twin model are constructed according to the corrosion thickness of each ultrasonic sensor device 21 node. The dynamic response simulation module 74 is in communication connection with the digital twin module 73 and the storage module 72 and the meteorological private network at the same time, and according to the meteorological data provided by the meteorological private network, the future two hours of meteorological conditions are divided into 6 load levels and 4 turbulence levels, and 24 working conditions are divided, and 24 kinds of loads for predicting the load condition of the wind turbine are built in for the 24 kinds of working conditions, the wind turbine is dynamically simulated according to the wall thickness loss rate and the load curve, the dynamic response in the future two hours is predicted, whether the safety threshold is exceeded is judged, and the machine is stopped when the safety threshold is exceeded. The visualization module 75 is in communication connection with the dynamic response simulation module 74 and the digital twin module 73 at the same time, and based on the initial tower size structure data, the tower three-dimensional model and the mechanical digital twin model data and the data in the dynamic response simulation module 74, a visual three-dimensional model for specifically displaying the corrosion condition of the splash zone 3, the first atmospheric zone 4 and the second atmospheric zone 5 is established, and an alarm is sent to the maintenance personnel when the safety threshold is exceeded.

[0120] In the present embodiment, all data information in the third router 93 is transmitted to the data processing module 71 via the coordinator 8. The digital twin module 73 constructs a tower tube three-dimensional model and a mechanical digital twin model according to the corrosion thickness of each ultrasonic sensor device 21 node in the data processing module 71. The dynamic response simulation module 74 divides the future two hours of weather conditions into 6 load levels and 4 turbulence levels according to the weather data provided by the meteorological private network, and divides 24 working conditions, and 24 loads for predicting the load condition of the wind turbine generator are built in for the 24 working conditions. According to the wall thickness loss rate and the load curve, and in combination with the models in the digital twin module 73, the dynamic response simulation of the wind turbine generator is carried out, the dynamic response in the future two hours is predicted, and it is judged whether the safety threshold is exceeded and the machine is stopped when the safety threshold is exceeded. The storage module 72 stores the data information in the data processing module 71 and the dynamic response simulation module 74. The visualization module 75 establishes a visual three-dimensional model for specifically displaying the corrosion condition of the splash zone 3, the first atmospheric zone 4, and the second atmospheric zone 5 based on the initial tower tube size structure data, the data of the tower tube three-dimensional model and the mechanical digital twin model, and the data in the dynamic response simulation module 74, and sends an alarm to the maintenance personnel when the safety threshold is exceeded.

[0121] Exemplarily, the corrosion monitoring server 7 calculates the corrosion thickness at each measurement node, refines the difference value, and constructs a tower tube three-dimensional model and a mechanical digital twin model according to the corrosion thickness of each ultrasonic sensor device 21 node through the digital twin module 73. The dynamic response simulation module 74 divides the future two hours of wind speed and turbulence data weather conditions into 6 load levels and 4 turbulence levels according to the weather data provided by the meteorological private network, and divides 24 working conditions, and 24 loads for predicting the load condition of the wind turbine generator are built in for the 24 working conditions. According to the wall thickness loss rate and the load curve, the dynamic response simulation of the wind turbine generator is carried out, and a visual three-dimensional model for specifically displaying the corrosion condition of the splash zone 3, the first atmospheric zone 4, and the second atmospheric zone 5 is established for risk assessment. When the dynamic response of the wind turbine generator under the future two hours of weather conditions exceeds the vibration warning threshold, a shutdown instruction is sent to stop the machine, and a fault warning is sent to the maintenance personnel. More specifically, when the inner and outer wall corrosion thickness exceeds 2.5 mm and the tower foundation bending stiffness is lower than the warning value, the machine is stopped in time and an alarm is sent to the maintenance personnel. Thus, online monitoring of tower tube corrosion and health state warning of the tower tube, as well as dynamic response warning, are realized.

[0122] Since the tower cylinder corrosion rate is a slowly varying function of time, the change of the corrosion thickness of the tower cylinder in a short time interval is negligible, therefore, the present application adopts a mathematical statistical method to fit the true tower cylinder wall thickness value according to all prior measurement data measured by a single node ultrasonic sensor within 5 minutes. The principle framework is as follows: first, the generalized likelihood ratio algorithm is used to quantify the change of WTLR statistical distribution with time. Second, the cumulative log-likelihood Z of the finite measurement subset is determined. Third, given the detection probability of 95% and the confidence level of 95%, the derivative of the cumulative log-likelihood Z is determined to determine the annual wall thickness loss rate of the tower cylinder. Thus, the corrosion thickness of the inner and outer walls in each corrosion area of the tower cylinder is calculated. Since the specific technical solutions in this principle framework are prior art, in order to avoid repetition, they will not be described in detail.

[0123] In specific embodiments, as shown in Figure 1 The 4 ultrasonic sensor devices 21 in each turn are regarded as a beam element.

[0124] In this embodiment, since 4 turns are arranged in the splash zone 3, the first atmospheric zone 4 and the second atmospheric zone 5, and there are 4 ultrasonic sensor devices 21 in each turn, there are 16 ultrasonic sensor devices 21 uniformly arranged in the splash zone 3, 16 ultrasonic sensor devices 21 uniformly arranged in the first atmospheric zone 4, and 16 ultrasonic sensor devices 21 uniformly arranged in the second atmospheric zone 5. Thus, the magnetic attraction type multi-point array arrangement is realized on the inner side wall of the tower cylinder, the influence of the external environment on the measurement accuracy is reduced, and the measurement accuracy, reliability, stability and service life are improved.

[0125] Since the 4 ultrasonic sensor devices 21 in each turn are regarded as a beam element, there are 12 beam elements in the splash zone 3, the first atmospheric zone 4 and the second atmospheric zone 5.

[0126] In specific embodiments, the generation process of the mechanical digital twin model is as follows:

[0127] A statics model of each beam element is established, the stiffness matrix of each beam element is superimposed into a total stiffness matrix to obtain a statics model of the complete tower cylinder, and inertia force and damping force are introduced to obtain a model of the mechanical digital twin;

[0128] The statics model is as follows:

[0129]

[0130] Where w1 and θ1 are boundary conditions, E' is a slowly varying time function considering corrosion, and E' / E = 1-0.857D.

[0131]

[0132]

[0133] …

[0134] The stiffness matrix of each beam element is superimposed into a total stiffness matrix, and the statics model of the complete tower drum is:

[0135]

[0136] The inertia force and damping force are introduced, and the model of the mechanical digital twin is completed:

[0137]

[0138] In the embodiment, the statics model and the model of the mechanical digital twin of each beam element in the splash zone, the first atmospheric zone and the second atmospheric zone are the same, and only different actual parameters need to be substituted.

[0139] In specific embodiments, the dynamic response simulation module includes a weight loss rate model describing the corrosion degree of steel, a splash zone steel structure weight loss rate model, an elastic modulus degradation model of corroded steel, a section bending stiffness model after corrosion, and a wind turbine generator dynamics model.

[0140] The weight loss rate model describing the corrosion degree of steel is:

[0141] D = [W(0) - W(t)] / W(0)

[0142] In the formula, W(0) is the initial mass of the tower drum; W(t) is the mass of the splash zone steel structure after corrosion;

[0143] Each beam element is an equal cross-section circular ring. Since the length of each beam element is short, the influence of the taper of the tower drum on its cross-section can be ignored. At this time, the splash zone steel structure weight loss rate model is:

[0144]

[0145] In the formula, l is the length of the splash zone of the tower drum, p is the density of the steel of the tower drum, R is the outer diameter size of the tower drum when the corrosion age is 0 years, r is the inner diameter size of the tower drum, d t is the corrosion thickness of the splash zone of the tower drum;

[0146] The elastic modulus degradation model of the corroded steel is:

[0147]

[0148] In the formula, E is the elastic modulus of the steel structure material of the tower drum before corrosion, E' is the elastic modulus of the steel structure material of the tower drum after corrosion;

[0149] The section bending stiffness model after corrosion is:

[0150]

[0151] The dynamics model of the wind turbine is:

[0152]

[0153] In the formula, {x} is a displacement vector {x}={x,z,α,θ,x tmd} T , is a velocity vector, is an acceleration vector, [M] is a mass matrix, [C] is a damping matrix, [K] is a stiffness matrix, [D] is a load matrix, and {F} is a load vector.

[0154] In the application, the ultrasonic sensor device 21 is located on the inner side wall of the tower drum, the magnetic attraction fixing seat unit 1 makes the detection end of the ultrasonic sensor device 21 directly contact with the inner side wall of the tower drum, and the measurement accuracy is increased; and an eddy current sensor is not needed to be arranged on each of the inner wall and the outer wall of the tower drum, so that the coaxiality requirement of the eddy current probes of the inner wall and the outer wall of the tower drum is avoided.

[0155] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, and all of them should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for offshore wind turbine tower corrosion monitoring and dynamic response failure warning, characterized in that, include: The magnetic fixing units are respectively installed on the inner walls of the splash zone, the first atmospheric zone, and the second atmospheric zone of the wind turbine tower; The measuring unit is disposed within the magnetic fixing base unit; A data transmission unit is simultaneously disposed in the splash zone, the first atmospheric zone, the second atmospheric zone, and the cabin. The data transmission unit is communicatively connected to the measurement unit and transmits the thickness data information acquired by the measurement unit. A corrosion monitoring server is installed inside the cabin. The corrosion monitoring server is communicatively connected to the data transmission unit, receives the thickness data information obtained by the measurement unit from the data transmission unit, and processes the thickness data information to perform real-time corrosion monitoring and dynamic response fault early warning. The measurement unit includes: An ultrasonic sensor is installed inside and connected to the magnetic fixing base unit. The ultrasonic sensor is used to measure the thickness data of the wind turbine tower. A data acquisition card is installed inside the magnetic fixing base unit and is communicatively connected to the ultrasonic sensing device, while temporarily storing the thickness data. A multi-channel signal preprocessing module is disposed inside the magnetic fixing base unit and is connected to the data acquisition card for signal processing, and performs preprocessing on the thickness data information. The data transmission unit includes: The first router is installed on the inner wall of the wind turbine tower located in the splash zone and is communicatively connected to all the ultrasonic sensing devices in the splash zone. The second router is installed on the inner wall of the wind turbine tower located in the first atmospheric zone and is communicatively connected to all the ultrasonic sensing devices in the first atmospheric zone. The second router is also communicatively connected to the first router. The third router is installed on the inner wall of the wind turbine tower located in the second atmospheric zone and is communicatively connected to all the ultrasonic sensing devices in the second atmospheric zone. The second router is also communicatively connected to the third router. The coordinator is located inside the cabin and is communicatively connected to the third router and the corrosion monitoring server. The corrosion monitoring server includes: The data processing module is communicatively connected to the coordinator, and calculates the corrosion thickness of each ultrasonic sensing device node based on the data information transmitted by the first router, the second router, the third router, and the coordinator, according to the functional relationship between the tower wall thickness and the reflection echo time, and through the reflection echo time of each ultrasonic sensing device node. The storage module is communicatively connected to the data processing module; The digital twin module is communicatively connected to the data processing module and constructs a three-dimensional model and a mechanical digital twin model of the tower based on the corrosion thickness of each ultrasonic sensing device node. The dynamic response simulation module is in communication connection with the digital twin module and the storage module and a meteorological private network, divides the meteorological conditions in the next two hours into 6 load levels and 4 turbulence levels and divides out 24 working conditions according to the meteorological data provided by the meteorological private network, and pre-sets 24 loads for predicting the load conditions of the wind turbine in the 24 working conditions, performs dynamic response simulation on the wind turbine according to the wall thickness loss rate and the load curve, predicts the dynamic response in the next two hours, judges whether the safety threshold is exceeded, and stops the machine when the safety threshold is exceeded; The visualization module is in communication connection with the dynamic response simulation module and the digital twin module, and establishes a visual three-dimensional model for specifically displaying the corrosion conditions of the splash zone, the first atmospheric zone and the second atmospheric zone based on the initial tower size structure data, the tower three-dimensional model, the data of the mechanical digital twin model and the data in the dynamic response simulation module, and sends an alarm to the maintenance personnel when the safety threshold is exceeded.

2. The offshore wind turbine tower corrosion monitoring and dynamic response failure warning device according to claim 1, characterized in that The magnetic attraction fixing seat unit comprises: a base connected to the inner side wall of the wind turbine tower in the splash zone, the first atmospheric zone and the second atmospheric zone; a magnetic attraction assembly arranged on the base and connected to the base; a shell assembly connected to the base; a distance adjusting assembly connected to the shell assembly.

3. The offshore wind turbine tower corrosion monitoring and dynamic response failure warning device according to claim 2, characterized in that The magnetic attraction assembly comprises: a vacuum chuck arranged on the base near the wind turbine tower side and adsorbed on the inner side wall of the wind turbine tower; a first through hole arranged horizontally on the base; a first tray arranged in the first through hole near the wind turbine tower side; a magnet arranged inside the vacuum chuck and near the wind turbine tower side; a screw cap connected to the first tray by threads on the outer surface of the screw cap side wall and the surface of the first through hole when the screw cap is inside the first through hole; a second through hole surrounded by the base.

4. The offshore wind turbine tower corrosion monitoring and dynamic response failure warning device according to claim 2, characterized in that, The shell assembly comprises: a shell connected to the base; a first shell connected to the shell and arranged inside the shell; a first opening part arranged at the end of the first shell near the base side; a third through hole arranged at the center of the shell.

5. The offshore wind turbine tower corrosion monitoring and dynamic response failure warning device according to claim 4, characterized in that The distance adjusting assembly comprises: a gasket in sliding connection with the first shell and perpendicular to the first shell; a screw connected to the surface of the gasket away from the base side through the third through hole; a spring connected to the surface of the gasket away from the screw side, and the end of the spring away from the gasket side is connected to the ultrasonic sensor device.

6. The offshore wind turbine tower corrosion monitoring and dynamic response failure warning device according to claim 1, characterized in that, Four turns of four ultrasonic sensor devices are arranged in the splash zone, the first atmospheric zone and the second atmospheric zone respectively, and each turn of four ultrasonic sensor devices is regarded as a beam unit.

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