Microprobe technology-based offshore wind power tower corrosion detection method and system

Abstract

The invention relates to an offshore wind power tower tube corrosion detection method and system based on a microprobe technology, and the method comprises the following steps: placing a microprobe corrosion detection device on a to-be-detected offshore wind power tower tube, and setting a probe interval between a signal transmitting probe and a signal receiving probe according to the thickness of an anticorrosive coating of the offshore wind power tower tube and the corrosion condition; in the process that the microprobe corrosion detection device moves on the offshore wind power tower drum to be detected, the signal emission probe emits an alternating current signal according to a preset frequency, and the emitted alternating current signal is propagated by taking the anti-corrosion coating as a medium and penetrates through the coating to enter the main body steel structure; the emitted alternating current signal is transmitted in the main body steel structure and then returns to the signal receiving probe through the anti-corrosion coating; the alternating current signals collected by the signal receiving probe are analyzed, metal resistance and capacitance effect equivalent capacitance values of the main body steel structure in the offshore wind power tower are obtained, and the corrosion conditions of the main body steel structure and the anticorrosive coating of the offshore wind power tower are judged according to the obtained metal resistance and equivalent capacitance values.

Description

Technical Field

[0001] The present application relates to the technical field of material corrosion detection, and more specifically, to a method and system for detecting corrosion of an offshore wind power tower based on microprobe technology. Background Art

[0002] In recent years, the global energy structure has been continuously transformed towards low-carbon and environmental protection. Renewable energy technologies represented by wind power generation have been widely used, among which offshore wind power generation is currently the fastest-growing green energy technology. However, offshore wind turbines face severe challenges of seawater corrosion, especially the tower materials of offshore wind turbines face various corrosion failures. The towers of offshore wind turbines are in a marine environment with high humidity and high salt fog all year round, and are easily affected by harsh environments such as seawater, atmospheric corrosion, and waves, resulting in variable equipment corrosion conditions. In severe cases, they may even cause safety accidents, resulting in casualties and economic losses. Corrosion monitoring technology can monitor the corrosion rate and state of equipment in real time and continuously, ensuring that corrosion problems are discovered and handled in a timely manner without affecting the safe and stable operation of the equipment system, thereby ensuring the safe operation of offshore wind turbines, extending the service life of equipment, and reducing maintenance costs and potential accident risks. In addition, corrosion monitoring can also help understand the formation process and control effect of corrosion, evaluate the operating life of equipment, and provide a scientific basis for formulating reasonable maintenance strategies. Therefore, in order to ensure the long-term stable operation and safe production of offshore wind turbines, it is necessary to use appropriate detection technology to conduct safety assessment of the corrosion of offshore wind turbines.

[0003] However, among the existing corrosion monitoring technologies, contact probe detection technology requires physical contact to measure the corrosion state of the material. This method has obvious defects for towers protected by coatings. It is destructive to the tower materials of offshore wind turbines covered with coatings. The probe needs to penetrate the coating, which will not only destroy the integrity of the coating, but also may cause the internal steel to be exposed to the corrosive environment, causing more serious corrosion, which is contrary to the principle of long-term stable service of offshore wind turbines. Secondly, methods such as the resistance probe method (hanging piece weight loss method) that use the corrosion of the probe to indirectly indicate the corrosion of the outer wall cannot directly and accurately detect the corrosion of the tower. Its credibility is not high and it cannot provide accurate data support for maintenance and repair work. Finally, although the emerging electromagnetic signal imaging technology can visualize the defects of metal structures to a certain extent, they usually lack quantitative evaluation of the degree of corrosion. At the same time, metal magnetic corrosion products will also interfere with the propagation of electromagnetic signals, thereby affecting the accuracy of the detection results.

[0004] The prior art, such as the Chinese patent application with the publication number "CN112343775A", discloses an on-line corrosion monitoring method for the tower barrel of an offshore wind turbine. The metal corrosion condition of the outer wall of the tower barrel of the offshore wind turbine is monitored through resistance probes, a corrosion data acquisition and transmission system, and a data processing system. The resistance probe technology is adopted. The resistance probes are installed on the outer wall of the tower barrel. The on-line probe corrosion measuring instrument in the on-site monitoring instrument cabinet collects, amplifies, and converts the signals, and then transmits them to the data processing system after processing. The data processing system is a computer in the monitoring room. The corrosion depth is calculated through Ohm's law.

[0005] The problems existing in the above prior art are that this method adopts the resistance probe technology, which can only detect the corrosion condition of the outer wall of the tower barrel, and the resistance probes need to be fixedly installed, and the detection process is relatively fixed, and it is impossible to detect the corrosion condition of the tower barrel in different regions. Summary of the Invention

[0006] To solve the above technical problems, the present invention proposes an offshore wind power tower barrel corrosion detection method and system based on microprobe technology.

[0007] The technical solution of the present invention is as follows:

[0008] The present invention proposes an offshore wind power tower barrel corrosion detection method based on microprobe technology, including the following steps:

[0009] Step S1, place the microprobe corrosion detection device on the offshore wind power tower barrel to be measured. The probes of the microprobe corrosion detection device include: a signal transmitting probe and a signal receiving probe. Set the probe interval between the signal transmitting probe and the signal receiving probe according to the thickness and corrosion condition of the anti-corrosion coating of the offshore wind power tower barrel.

[0010] Step S2, during the movement of the microprobe corrosion detection device on the offshore wind power tower barrel to be measured, the signal transmitting probe emits an alternating current signal at a preset frequency. The emitted alternating current signal propagates through the anti-corrosion coating of the wind power tower barrel and penetrates the coating into the main steel structure of the wind power tower barrel.

[0011] Step S3, after the emitted alternating current signal is conducted in the main steel structure of the wind power tower barrel, it returns to the signal receiving probe through the anti-corrosion coating of the wind power tower barrel. At this time, the anti-corrosion coating of the wind power tower barrel forms a capacitance effect in the loop.

[0012] Step S4, analyze the alternating current signal collected by the signal receiving probe to obtain the metal resistance and the equivalent capacitance value of the capacitance effect of the main steel structure in the offshore wind power tower barrel. Judge the corrosion condition of the main steel structure and the anti-corrosion coating of the offshore wind power tower barrel according to the obtained metal resistance and equivalent capacitance value.

[0013] As a preferred embodiment, the microprobe corrosion detection device further includes: a magnetic adsorption climbing mechanism, a control and analysis integration mechanism, and a solar cell; wherein, the magnetic adsorption climbing mechanism is used to drive the microprobe corrosion detection device to move on the offshore wind turbine tower; the control and analysis integration mechanism is used to control the microprobe corrosion detection device and collect and analyze the corrosion conditions of the main steel structure and the anti-corrosion coating of the offshore wind turbine tower; and the solar cell is used to provide electrical energy for the entire microprobe corrosion detection device.

[0014] As a preferred embodiment, the probe spacing of the signal emission probe and the signal reception probe of the microprobe corrosion detection device is set according to the thickness and corrosion conditions of the anti-corrosion coating of the offshore wind turbine tower. The initial probe spacing is set according to the design specifications of the wind turbine tower and the experience of previous similar projects. During the movement of the microprobe corrosion detection device, the probe spacing is adjusted according to the real-time monitored data. The specific adjustment basis is as follows:

[0015]

[0016] In the formula: L is the distance between the signal emission probe and the signal reception probe; ε0 and ε S are the vacuum permittivity and the relative permittivity of the anti-corrosion coating respectively; S2 is the contact area between the emission probe and the reception probe and the anti-corrosion coating; C is the equivalent capacitance value of the capacitance effect formed by the steel structure, the anti-corrosion coating, and the emission and reception microprobes; d is the thickness of the anti-corrosion coating; and k is a correction factor.

[0017] As a preferred embodiment, the calculation methods of the metal resistance and the equivalent capacitance value are as follows:

[0018]

[0019] In the formula: R is the resistance value of the metal resistance of the main steel structure in the CRC series circuit; ρ is the resistivity of the main steel structure; L is the distance between the emission probe and the reception probe; S1 is the conductive cross-sectional area of the main steel structure; C is the equivalent capacitance value of the capacitance effect formed by the steel structure, the anti-corrosion coating, and the emission and reception microprobes; ε0 and ε S are the vacuum permittivity and the relative permittivity of the anti-corrosion coating respectively; S2 is the contact area between the emission probe and the reception probe and the anti-corrosion coating, and d is the thickness of the anti-corrosion coating.

[0020] On the other hand, the present invention also provides an offshore wind turbine tower corrosion detection system based on microprobe technology, including:

[0021] Device setting and initialization module: Place the microprobe corrosion detection device on the offshore wind turbine tower to be measured. The probes of the microprobe corrosion detection device include a signal transmitting probe and a signal receiving probe. Set the probe interval between the signal transmitting probe and the signal receiving probe according to the thickness and corrosion condition of the anti-corrosion coating of the offshore wind turbine tower.

[0022] Electrical signal transmitting module: During the movement of the microprobe corrosion detection device on the offshore wind turbine tower to be measured, the signal transmitting probe emits an alternating current signal at a preset frequency. The emitted alternating current signal propagates through the anti-corrosion coating of the wind turbine tower as a medium and penetrates the coating into the main steel structure of the wind turbine tower.

[0023] Electrical signal receiving module: The emitted alternating current signal is conducted in the main steel structure of the wind turbine tower and then returns to the signal receiving probe through the anti-corrosion coating of the wind turbine tower. At this time, the anti-corrosion coating of the wind turbine tower forms a capacitance effect in the circuit.

[0024] Corrosion condition analysis and processing module: Analyze the alternating current signal collected by the signal receiving probe to obtain the metal resistance of the main steel structure in the offshore wind turbine tower and the equivalent capacitance value of the capacitance effect. Judge the corrosion conditions of the main steel structure and the anti-corrosion coating of the offshore wind turbine tower according to the obtained metal resistance and equivalent capacitance value.

[0025] As a preferred embodiment, the microprobe corrosion detection device further includes a magnetic adsorption climbing mechanism, a control and analysis integration mechanism, and a solar cell. Among them, the magnetic adsorption climbing mechanism is used to drive the microprobe corrosion detection device to move on the offshore wind turbine tower; the control and analysis integration mechanism is used to control the microprobe corrosion detection device and collect and analyze the corrosion conditions of the main steel structure and the anti-corrosion coating of the offshore wind turbine tower; the solar cell is used to provide electrical energy for the entire microprobe corrosion detection device.

[0026] As a preferred embodiment, in the device setting and initialization module, set the probe interval between the signal transmitting probe and the signal receiving probe of the microprobe corrosion detection device according to the thickness and corrosion condition of the anti-corrosion coating of the offshore wind turbine tower. The initial probe interval is set according to the design specifications of the wind turbine tower and the experience of previous similar projects. During the movement of the microprobe corrosion detection device, adjust the probe interval according to the real-time monitored data. The specific adjustment basis is:

[0027]

[0028] In the formula: L is the distance between the signal transmitting probe and the signal receiving probe; ε0 and ε S are the vacuum permittivity and the relative permittivity of the anti-corrosion coating respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating; C is the equivalent capacitance value of the capacitance effect formed by the steel structure, the anti-corrosion coating, and the transmitting and receiving microprobes; d is the thickness of the anti-corrosion coating; k is the correction coefficient.

[0029] As a preferred embodiment, in the corrosion situation analysis and processing module, the calculation methods of the metal resistance and the equivalent capacitance value are as follows:

[0030]

[0031] In the formula: R is the resistance value of the metal resistance of the main steel structure in the CRC series circuit; ρ is the resistivity of the main steel structure; L is the distance between the transmitting probe and the receiving probe; S1 is the conductive cross-sectional area of the main steel structure; C is the equivalent capacitance value of the capacitance effect formed by the steel structure, the anti-corrosion coating, and the transmitting and receiving micro-probes; ε0 and ε S are the vacuum permittivity and the relative permittivity of the anti-corrosion coating respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating, and d is the thickness of the anti-corrosion coating.

[0032] On the other hand, the present invention also provides an electronic device, on which a computer program is stored, and when the computer program is executed by a processor, it implements a method for detecting corrosion of an offshore wind turbine tower based on micro-probe technology as described in any embodiment of the present invention.

[0033] On the other hand, the present invention also provides a computer-readable medium for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement a method for detecting corrosion of an offshore wind turbine tower based on micro-probe technology as described in any embodiment of the present invention.

[0034] The present invention has the following beneficial effects:

[0035] 1. The corrosion detection method proposed by the present invention belongs to a non-destructive detection method. It adopts the micro-probe alternating current capacitance signal detection principle and can be detected without penetrating the coating, thus avoiding damage to the coating and protecting the integrity of the tower.

[0036] 2. The corrosion detection method proposed by the present invention has stability, directness, and accuracy. By using the mature probe electrical signal detection technology, it can reduce the interference of external factors. The alternating current signal emitted by the micro-probe penetrates the coating and returns, directly detecting the corrosion situation of the main steel structure of the tower, providing direct and accurate corrosion state information, and improving the credibility of the detection.

[0037] 3. The corrosion detection method proposed by the present invention adopts a self-powered and mobile detection scheme. It uses a solar cell for self-power supply, solves the energy problem of the mobile detection device, and at the same time, the use of a magnetic adsorption climbing mechanism enables the detection device to move to various areas of the tower, realizing comprehensive and real-time monitoring. Description of the Drawings

[0038] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0039] Figure 1 Schematic diagram of the method flow of the present invention;

[0040] Figure 2 Schematic diagram of the microprobe corrosion detection device installed on the wind turbine tower (the magnetic adsorption climbing mechanism is not shown).

[0041] The reference numerals in the figure are represented as:

[0042] 1. Signal emission probe; 2. Signal reception probe; 3. Control and analysis integration mechanism; 4. Solar cell; 5. Anticorrosion coating; 6. Main steel structure of the wind turbine tower. Specific embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0044] It should be understood that the step numbers used in the text are only for convenient description and do not limit the execution order of the steps.

[0045] It should be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless otherwise clearly specified in the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0046] The terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0047] The term "and / or" refers to any combination and all possible combinations of one or more of the associated listed items and includes these combinations.

[0048] Embodiment 1:

[0049] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will describe the technical solutions of the present invention clearly and completely in conjunction with specific embodiments of the present application and with reference to the attached Figure 1 , and make a clear and complete description of the technical solutions of the present invention.

[0050] To solve the problems of the prior art, the present invention provides a method for detecting corrosion of an offshore wind turbine tower based on microprobe technology, including the following steps:

[0051] Step S1: Place the microprobe corrosion detection device on the offshore wind turbine tower to be measured. The probes of the microprobe corrosion detection device include a signal transmitting probe and a signal receiving probe, and set the probe interval between the signal transmitting probe and the signal receiving probe according to the thickness and corrosion condition of the anti-corrosion coating of the offshore wind turbine tower.

[0052] The microprobe corrosion detection device further includes a magnetic adsorption climbing mechanism, a control and analysis integration mechanism, and a solar cell. Among them, the magnetic adsorption climbing mechanism is used to drive the microprobe corrosion detection device to move on the offshore wind turbine tower; the control and analysis integration mechanism is used to control the microprobe corrosion detection device and collect and analyze the corrosion conditions of the main steel structure and anti-corrosion coating of the offshore wind turbine tower; the solar cell is used to provide electrical energy for the entire microprobe corrosion detection device.

[0053] The probe interval between the signal transmitting probe and the signal receiving probe of the microprobe corrosion detection device is set according to the thickness and corrosion condition of the anti-corrosion coating of the offshore wind turbine tower. The initial probe interval is set according to the design specifications of the wind turbine tower and the experience of previous similar projects. During the movement of the microprobe corrosion detection device, the probe interval is adjusted according to the real-time monitored data. The specific adjustment basis is:

[0054]

[0055] In the formula: L is the distance between the signal transmitting probe and the signal receiving probe; ε0, ε S are the vacuum permittivity and the relative permittivity of the anti-corrosion coating respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating; C is the equivalent capacitance value of the capacitance effect formed by the steel structure, the anti-corrosion coating, and the transmitting and receiving microprobes; d is the thickness of the anti-corrosion coating; k is the correction coefficient.

[0056] Step S2: During the movement of the microprobe corrosion detection device on the offshore wind turbine tower to be measured, the signal transmitting probe emits an alternating current signal at a preset frequency. The emitted alternating current signal is propagated through the anti-corrosion coating of the wind turbine tower as a medium and penetrates the coating into the main steel structure of the wind turbine tower.

[0057] The signal transmitting probe emits an alternating current signal at a preset frequency. The expression of the alternating current signal is:

[0058]

[0059] Where: u(t) and i(t) are the instantaneous voltage and current values of the AC signal; U and I are the effective values of the voltage and current of the AC signal respectively; ω is the preset angular frequency; t is the duration experienced by the AC signal starting from the emission time.

[0060] Step S3, the emitted AC signal is conducted in the main steel structure of the wind turbine tower and then returns to the signal receiving probe through the anti-corrosion coating of the wind turbine tower. At this time, the anti-corrosion coating of the wind turbine tower forms a capacitance effect in the loop.

[0061] The anti-corrosion coating of the wind turbine tower forms a capacitance effect in the loop, causing a phase change in the AC signal. Specifically:

[0062]

[0063] Where: i C (t) is the instantaneous value of the AC current passing through the capacitor C; u c (t) is the instantaneous voltage value across the capacitor C; C is the equivalent capacitance value of the capacitance effect formed by the steel structure, the anti-corrosion coating, and the transmitting and receiving micro-probes. is the voltage change rate;

[0064] The expression of the capacitive reactance effect is:

[0065]

[0066] Where: X C is the capacitive reactance; f is the frequency of the electrical signal, and the relationship with the angular frequency of the electrical signal is ω = 2πf.

[0067] Step S4, analyze the AC signal collected by the signal receiving probe to obtain the metal resistance of the main steel structure in the offshore wind turbine tower and the equivalent capacitance value of the capacitance effect, and judge the corrosion conditions of the main steel structure and the anti-corrosion coating of the offshore wind turbine tower according to the obtained metal resistance and equivalent capacitance value.

[0068] As Figure 2 shown, the AC signal is emitted by the signal transmitting probe, conducted through the anti-corrosion coating to the inside of the main steel structure of the offshore wind turbine tower, and then returns to the signal receiving probe through the anti-corrosion coating. Its conduction process can be simplified as experiencing a CRC series circuit, and the instantaneous relationship of the circuit is as follows:

[0069]

[0070] u = u(t) R + u C1 (t) + u C2 (t);

[0071] Where: u is the total voltage of the CRC series circuit; u R is the instantaneous voltage value across the metal resistance of the main steel structure in the CRC series circuit; u C1 (t), u C2 (t) are the instantaneous voltage values across the capacitors formed by the electrical signal passing through the anti-corrosion coating once and twice, respectively;

[0072] According to Kirchhoff's voltage law in phasor form, we have:

[0073]

[0074] Where: is the total voltage vector of the CRC series circuit; is the voltage vector across the metal resistance of the main steel structure in the CRC series circuit; are the voltage phasors across the primary and secondary capacitors, respectively; is the current vector of the CRC series circuit; R is the resistance value of the metal resistance of the main steel structure in the CRC series circuit; j is the imaginary unit.

[0075] According to the phasor change of the AC signal, the metal resistance and the equivalent capacitance value of the capacitance effect in the tower can be calculated. The calculation methods of the metal resistance and the equivalent capacitance value are as follows:

[0076]

[0077] Where: R is the resistance value of the metal resistance of the main steel structure in the CRC series circuit; ρ is the resistivity of the main steel structure; L is the distance between the transmitting probe and the receiving probe; S1 is the conductive cross-sectional area of the main steel structure; C is the equivalent capacitance value of the capacitance effect formed by the steel structure, the anti-corrosion coating, and the transmitting and receiving micro-probes; ε0, ε S are the vacuum permittivity and the relative permittivity of the anti-corrosion coating, respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating, and d is the thickness of the anti-corrosion coating. Due to the corrosion effect, when the metal corrodes, the thickness will decrease, resulting in an increase in the metal resistance. Corrosion will also cause a decrease in the density of the anti-corrosion coating or a loss of thickness, etc. In this case, its permittivity will increase and the detection distance will decrease, resulting in an increase in capacitance. The corrosion conditions of the main steel structure and the anti-corrosion coating of the offshore wind turbine tower are judged according to the changes in the metal resistance and the equivalent capacitance value.

[0078] Example 2:

[0079] This example provides an offshore wind turbine tower corrosion detection system based on micro-probe technology, including:

[0080] Device setting and initialization module: Place the microprobe corrosion detection device on the offshore wind turbine tower to be measured. The probes of the microprobe corrosion detection device include a signal transmitting probe and a signal receiving probe. Set the probe interval between the signal transmitting probe and the signal receiving probe according to the thickness and corrosion condition of the anti-corrosion coating of the offshore wind turbine tower.

[0081] Electrical signal transmitting module: During the movement of the microprobe corrosion detection device on the offshore wind turbine tower to be measured, the signal transmitting probe emits an alternating current signal at a preset frequency. The emitted alternating current signal propagates through the anti-corrosion coating of the wind turbine tower as a medium and penetrates the coating into the main steel structure of the wind turbine tower.

[0082] Electrical signal receiving module: After the emitted alternating current signal is conducted in the main steel structure of the wind turbine tower, it returns to the signal receiving probe through the anti-corrosion coating of the wind turbine tower. At this time, the anti-corrosion coating of the wind turbine tower forms a capacitance effect in the circuit.

[0083] Corrosion condition analysis and processing module: Analyze the alternating current signal collected by the signal receiving probe to obtain the metal resistance of the main steel structure in the offshore wind turbine tower and the equivalent capacitance value of the capacitance effect. Judge the corrosion conditions of the main steel structure and the anti-corrosion coating of the offshore wind turbine tower according to the obtained metal resistance and equivalent capacitance value.

[0084] Embodiment 3:

[0085] This embodiment provides an electronic device with a computer program stored thereon. When the computer program is executed by a processor, it implements a method for detecting corrosion of an offshore wind turbine tower based on microprobe technology as described in any embodiment of the present invention.

[0086] Embodiment 4:

[0087] This embodiment provides a computer-readable medium for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement a method for detecting corrosion of an offshore wind turbine tower based on microprobe technology as described in any embodiment of the present invention.

[0088] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent the situations of A existing alone, A and B existing simultaneously, and B existing alone. Where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0089] Those of ordinary skill in the art can realize that the various units and algorithm steps described in the embodiments disclosed herein can be implemented by a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present application.

[0090] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0091] In several embodiments provided by the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs that can store program codes.

[0092] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for detecting corrosion of offshore wind turbine towers based on microprobe technology, characterized in that: The following steps are involved: Step S1, placing a microprobe corrosion detection device on the offshore wind turbine tower to be tested, wherein the probes of the microprobe corrosion detection device include: a signal transmitting probe and a signal receiving probe, and the probe interval between the signal transmitting probe and the signal receiving probe is set according to the thickness of the anti-corrosion coating of the offshore wind turbine tower and the corrosion condition; Step S2, when the microprobe corrosion detection device moves on the offshore wind turbine tower to be tested, the signal transmitting probe sends out an AC signal at a preset frequency, and the AC signal is transmitted through the wind turbine tower anti-corrosion coating as a medium and penetrates the coating into the main steel structure of the wind turbine tower; Step S3, the AC signal is transmitted in the main steel structure of the wind turbine tower and then returns to the signal receiving probe through the wind turbine tower anti-corrosion coating. At this time, the wind turbine tower anti-corrosion coating forms a capacitive effect in the loop; Step S4, analyzing the AC signal collected by the signal receiving probe to obtain the metal resistance and capacitance effect equivalent capacitance value of the main steel structure in the offshore wind turbine tower, and judging the corrosion condition of the main steel structure and anti-corrosion coating of the offshore wind turbine tower according to the obtained metal resistance and equivalent capacitance values.

2. According to claim 1, a method for detecting corrosion of offshore wind turbine towers based on microprobe technology is characterized in that: The microprobe corrosion detection device also includes: a magnetic climbing mechanism, a control and analysis integrated mechanism and a solar cell; wherein the magnetic climbing mechanism is used to drive the microprobe corrosion detection device to move on the offshore wind turbine tower; the control and analysis integrated mechanism is used to control the microprobe corrosion detection device and collect and analyze the corrosion conditions of the main steel structure and anti-corrosion coating of the offshore wind turbine tower; the solar cell is used to provide electrical energy for the entire microprobe corrosion detection device.

3. The offshore wind turbine tower corrosion detection method based on microprobe technology according to claim 1 is characterized by: The probe interval of the signal transmitting probe and the signal receiving probe of the microprobe corrosion detection device is set according to the thickness of the anti-corrosion coating of the offshore wind turbine tower and the corrosion condition. The initial probe interval is set according to the design specifications of the wind turbine tower and the experience of previous similar projects. The probe interval of the microprobe corrosion detection device is adjusted according to the real-time monitoring data during the movement. The specific adjustment is based on: Where: L is the distance between the signal transmitting probe and the signal receiving probe; ε0, ε S are the vacuum dielectric constant and the relative dielectric constant of the anti-corrosion coating respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating; C is the equivalent capacitance value of the capacitance effect composed of the steel structure, anti-corrosion coating, transmitting and receiving microprobes; d is the thickness of the anti-corrosion coating; k is the correction factor.

4. The offshore wind turbine tower corrosion detection method based on microprobe technology according to claim 1 is characterized by: The calculation method of the metal resistance and equivalent capacitance value is: Where: R is the resistance of the metal resistor of the main steel structure in the CRC series circuit; ρ is the resistivity of the main steel structure; L is the distance between the transmitting probe and the receiving probe; S1 is the conductive cross-sectional area of ​​the main steel structure; C is the equivalent capacitance value of the capacitance effect composed of the steel structure, anti-corrosion coating, transmitting and receiving microprobes; ε0, ε S are the dielectric constant of vacuum and the relative dielectric constant of anti-corrosion coating respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating, and d is the thickness of the anti-corrosion coating.

5. An offshore wind power tower corrosion detection system based on microprobe technology, characterized in that: include: The device setting and initialization module is used to place the microprobe corrosion detection device on the offshore wind power tower to be tested. The probes of the microprobe corrosion detection device include: a signal transmitting probe and a signal receiving probe. The probe interval between the signal transmitting probe and the signal receiving probe is set according to the thickness of the anti-corrosion coating of the offshore wind power tower and the corrosion condition. The electric signal transmitting module, when the microprobe corrosion detection device moves on the offshore wind turbine tower to be tested, the signal transmitting probe sends out an AC signal at a preset frequency. The AC signal is transmitted through the wind turbine tower anti-corrosion coating as a medium and penetrates the coating into the main steel structure of the wind turbine tower. The AC signal from the electrical signal receiving module is transmitted in the main steel structure of the wind turbine tower and then returns to the signal receiving probe through the wind turbine tower anti-corrosion coating. At this time, the wind turbine tower anti-corrosion coating forms a capacitive effect in the loop; The corrosion analysis and processing module analyzes the AC signal collected by the signal receiving probe to obtain the metal resistance and equivalent capacitance value of the main steel structure in the offshore wind turbine tower, and judges the corrosion condition of the main steel structure and anti-corrosion coating of the offshore wind turbine tower based on the obtained metal resistance and equivalent capacitance values.

6. The offshore wind power tower corrosion detection system based on microprobe technology according to claim 5 is characterized by: The microprobe corrosion detection device also includes: a magnetic climbing mechanism, a control and analysis integrated mechanism and a solar cell; wherein the magnetic climbing mechanism is used to drive the microprobe corrosion detection device to move on the offshore wind turbine tower; the control and analysis integrated mechanism is used to control the microprobe corrosion detection device and collect and analyze the corrosion conditions of the main steel structure and anti-corrosion coating of the offshore wind turbine tower; the solar cell is used to provide electrical energy for the entire microprobe corrosion detection device.

7. The offshore wind power tower corrosion detection system based on microprobe technology according to claim 5 is characterized by: In the device setting and initialization module, the probe interval of the signal transmitting probe and the signal receiving probe of the microprobe corrosion detection device is set according to the thickness of the anti-corrosion coating of the offshore wind power tower and the corrosion condition. The initial probe interval is set according to the design specifications of the wind turbine tower and the experience of previous similar projects. During the movement of the microprobe corrosion detection device, the probe interval is adjusted according to the real-time monitoring data. The specific adjustment is based on: Where: L is the distance between the signal transmitting probe and the signal receiving probe; ε0, ε S are the vacuum dielectric constant and the relative dielectric constant of the anti-corrosion coating respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating; C is the equivalent capacitance value of the capacitance effect composed of the steel structure, anti-corrosion coating, transmitting and receiving microprobes; d is the thickness of the anti-corrosion coating; k is the correction factor.

8. The offshore wind power tower corrosion detection system based on microprobe technology according to claim 5 is characterized by: In the corrosion analysis and processing module, the metal resistance and equivalent capacitance are calculated as follows: Where: R is the resistance of the metal resistor of the main steel structure in the CRC series circuit; ρ is the resistivity of the main steel structure; L is the distance between the transmitting probe and the receiving probe; S1 is the conductive cross-sectional area of ​​the main steel structure; C is the equivalent capacitance value of the capacitance effect composed of the steel structure, anti-corrosion coating, transmitting and receiving microprobes; ε0, ε S are the dielectric constant of vacuum and the relative dielectric constant of anti-corrosion coating respectively; S2 is the contact area between the transmitting probe and the receiving probe and the anti-corrosion coating, and d is the thickness of the anti-corrosion coating.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, an offshore wind power tower corrosion detection method based on microprobe technology as described in any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, an offshore wind power tower corrosion detection method based on microprobe technology as described in any one of claims 1 to 4 is implemented.

Images