CN113464380B - Tower drum safety performance determination method, device, equipment and storage medium - Google Patents
Tower drum safety performance determination method, device, equipment and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The application relates to a method, a device, equipment and a storage medium for determining the safety performance of a tower barrel, in particular to the field of new energy. The method comprises the following steps: acquiring target video data; performing data processing on the target video data to obtain a target vibration frequency of the target tower drum; and comparing the target vibration frequency of the target tower drum with the original natural frequency of the target tower drum, and determining the safety performance of the target tower drum. According to the scheme, the safety performance of the target tower drum can be determined only by acquiring the video data of the target tower drum within the appointed time, the free shaking of the tower drum is not required to be stimulated, and the detection efficiency of the safety of the tower drum is improved.
Description
Technical Field
The invention relates to the field of new energy, in particular to a method, a device, equipment and a storage medium for determining the safety performance of a tower barrel.
Background
In the field of new energy, wind power generation plays an important role as renewable energy power generation with the most mature technology except hydroelectric power generation.
After the wind turbine generator system is put into operation, the tower section of thick bamboo is not hard up with impeller resonance, tower section of thick bamboo crackle, the connecting bolt between the tower section of thick bamboo is not hard up, the fan basis is connected not hard up or is connected the rigidity not enough, and the manufacturing parameter of tower section of thick bamboo does not accord with design parameter and so on, all can threaten the healthy operation of a tower section of thick bamboo, and difficult discovery is patrolled and examined at the daily operation of fan to above problem simultaneously, probably makes fan tower section of thick bamboo take a trouble continuous operation. In order to detect the safety of the tower, a person skilled in the art usually excites the tower to largely shake freely and then measures the vibration condition of the tower by means of an emergency stop mode when the unit operates, so as to determine the safety of the tower according to the frequency of the free shake of the tower.
In the above scheme, the wind turbine generator needs to be suddenly stopped after being operated when the tower barrel is measured every time, and the detection efficiency is low.
Disclosure of Invention
The application provides a method and a device for determining the safety performance of a tower drum, computer equipment and a storage medium.
In one aspect, a method for determining the safety performance of a tower is provided, where the method includes:
acquiring target video data; the target video data is used for indicating the vibration condition of the target tower drum within a specified time;
performing data processing on the target video data to obtain a target vibration frequency of the target tower drum; the target vibration frequency is used for indicating the vibration frequency of the target tower drum under the excited condition corresponding to the target video data;
comparing the target vibration frequency of the target tower drum with the original natural frequency of the target tower drum, and determining the safety performance of the target tower drum; the original natural frequency is used for indicating the vibration frequency of the target tower under the specified excited condition.
In another aspect, an apparatus for determining tower safety performance is provided, the apparatus comprising:
the video data acquisition module is used for acquiring target video data; the target video data is used for indicating the vibration condition of the target tower drum within a specified time;
the vibration frequency acquisition module is used for carrying out data processing on the target video data to acquire the target vibration frequency of the target tower drum;
the safety performance determining module is used for comparing the target vibration frequency of the target tower drum with the original natural frequency of the target tower drum and determining the safety performance of the target tower drum; the original natural frequency is used for indicating the vibration frequency of the target tower under the specified excited condition.
In one possible implementation manner, the security performance determination module is configured to,
when the difference between the target vibration frequency and the original natural frequency is within a first threshold range, determining the target tower drum as a safe state;
or,
when the difference between the target vibration frequency and the original natural frequency is within a second threshold value range, determining the target tower drum to be in an unsafe state;
wherein a maximum of the first threshold range and the second threshold range is less than a measurement threshold.
In one possible implementation, when the target tower includes a replaced component, the safety performance determination module further includes:
a first threshold determination unit configured to determine the first threshold according to a replaced component in the target tower.
In a possible implementation manner, the target video data further includes an environmental parameter; the environment parameter is used for indicating the environment information of the target tower drum when the target video is obtained;
the vibration frequency acquisition module includes:
the candidate vibration acquisition unit is used for performing data processing on at least two sections of continuous video clips in the target video data to respectively acquire at least two candidate vibration frequencies of the target tower;
and the target vibration determining unit is used for processing the at least two candidate vibration frequencies according to the environment parameters of the continuous video clips corresponding to the candidate vibration frequencies respectively to determine the target vibration frequency.
In a possible implementation manner, the vibration frequency obtaining module further includes:
determining the candidate vibration frequency of the at least two candidate vibration frequencies, wherein the environment parameter of the corresponding continuous video clip meets the environment threshold condition, as an available vibration frequency;
and carrying out error elimination processing on the available vibration frequency, and determining the target vibration frequency.
In one possible implementation manner, the at least two candidate vibration frequencies include a first candidate vibration frequency;
the candidate vibration acquisition unit includes:
a continuous frame image acquisition subunit, configured to acquire each continuous image frame in the first continuous video segment;
the image feature extraction subunit is used for performing image feature extraction on each continuous image frame to respectively obtain image feature points of each continuous image frame;
and the candidate vibration obtaining subunit is configured to determine a first candidate vibration frequency corresponding to the first continuous video segment according to distance information between corresponding image feature points in each continuous image frame.
In another aspect, a computer device is provided, where the computer device includes a processor and a memory, where the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the tower security performance determination method described above.
In yet another aspect, a computer-readable storage medium is provided, and at least one instruction is stored in the storage medium and loaded and executed by a processor to implement the tower security performance determination method described above.
In yet another aspect, a computer program product or computer program is provided, the computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and executes the computer instructions, so that the computer device executes the tower safety performance determination method.
The technical scheme provided by the application can comprise the following beneficial effects:
the vibration frequency corresponding to the target tower drum can be obtained by analyzing the target video data acquired by the target tower drum, and at the moment, the vibration frequency of the target tower drum under the specified excited condition can be compared with the vibration frequency obtained by video analysis to determine whether the performance of the target tower drum is greatly changed or not so as to determine the safety of the target tower drum. Therefore, the safety performance of the target tower drum can be determined only by acquiring the video data of the target tower drum within the designated time, the free shaking of the tower drum is not required to be stimulated, and the detection efficiency of the safety of the tower drum is improved.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram illustrating a tower security determination system in accordance with an exemplary embodiment;
FIG. 2 is a method flow diagram illustrating a method for tower safety performance determination in accordance with an exemplary embodiment;
FIG. 3 is a method flow diagram illustrating a method for tower safety performance determination in accordance with an exemplary embodiment;
FIG. 4 is a schematic diagram of a motion state acquisition method according to the embodiment shown in FIG. 3;
FIG. 5 is a chart illustrating a tower vibration frequency according to the embodiment shown in FIG. 3;
FIG. 6 is a flow diagram illustrating a method for tower safety determination, according to an exemplary embodiment;
FIG. 7 is a block diagram illustrating a configuration of a tower security determination apparatus in accordance with an exemplary embodiment;
fig. 8 shows a block diagram of a computer device according to an exemplary embodiment of the present application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
It should be understood that "indication" mentioned in the embodiments of the present application may be a direct indication, an indirect indication, or an indication of an association relationship. For example, a indicates B, which may mean that a directly indicates B, e.g., B may be obtained by a; it may also mean that a indicates B indirectly, e.g. a indicates C, by which B may be obtained; it can also mean that there is an association between a and B.
In the description of the embodiments of the present application, the term "correspond" may indicate that there is a direct correspondence or an indirect correspondence between the two, may also indicate that there is an association between the two, and may also indicate and be indicated, configure and configured, and so on.
In the embodiment of the present application, "predefining" may be implemented by saving a corresponding code, table, or other manners that may be used to indicate related information in advance in a device (for example, including a terminal device and a network device), and the present application is not limited to a specific implementation manner thereof.
FIG. 1 is a schematic structural diagram illustrating a tower security determination system in accordance with an exemplary embodiment. The tower security determination system includes a server 110 and image capturing devices 120.
Each image capturing device 120 is configured to capture video image data of a corresponding target tower, so as to process the video image data and obtain the security performance of the target tower.
Optionally, the image acquisition device includes a data processor with high performance, and after the image acquisition device acquires video image data of a target tower, the acquired video image data of the target tower can be processed by the data processor, so as to obtain the security performance of the target tower and send the security performance to the server for storage.
Optionally, after the image acquisition device acquires the video image data of the target tower drum, the video image data of the target tower drum may be directly sent to the server, and the data processor in the server processes the video data of the target tower drum to obtain the security performance of the target tower drum.
Optionally, the image capturing device is an image capturing device with high frame rate video image capturing capability (such as a high-speed camera or other terminal devices with high-speed camera capturing capability), and when the target tower is captured by the image capturing device with high frame rate video image capturing capability, more detailed tower motion conditions can be obtained, so as to improve the safety performance of the target tower determined according to the video image data.
Optionally, the target tower is a wind tower, i.e. a tower for wind power generation, which mainly plays a supporting role in the wind turbine generator system and absorbs the vibration of the wind turbine generator system.
Optionally, the server may be an independent physical server, a server cluster formed by a plurality of physical servers, or a distributed system, and may also be a cloud server that provides technical computing services such as cloud service, a cloud database, cloud computing, a cloud function, cloud storage, network service, cloud communication, middleware service, domain name service, security service, CDN, and a big data and artificial intelligence platform.
Optionally, the system may further include a management device, where the management device is configured to manage the system (e.g., manage connection states between the modules and the server, and the management device is connected to the server through a communication network. Optionally, the communication network is a wired network or a wireless network.
Optionally, the wireless network or wired network described above uses standard communication techniques and/or protocols. The network is typically the internet, but may be any other network including, but not limited to, a local area network, a metropolitan area network, a wide area network, a mobile, a limited or wireless network, a private network, or any combination of virtual private networks. In some embodiments, data exchanged over the network is represented using techniques and/or formats including hypertext markup language, extensible markup language, and the like. All or some of the links may also be encrypted using conventional encryption techniques such as secure sockets layer, transport layer security, virtual private network, internet protocol security, and the like. In other embodiments, custom and/or dedicated data communication techniques may also be used in place of, or in addition to, the data communication techniques described above.
FIG. 2 is a method flow diagram illustrating a method for tower safety performance determination, according to an exemplary embodiment. The method is performed by a computer device, which may be the server 110 in the tower security determination system as shown in FIG. 1. As shown in fig. 2, the method for determining the tower safety performance may include the following steps:
The target video data is used to indicate the vibration condition of the target tower in a specified time.
The target video data is obtained by image acquisition equipment acquiring images of a target tower barrel within a specified time period. The motion condition of the target tower recorded in the target video data may represent a vibration condition of the target tower in a specified time, such as a frequency of the vibration of the target tower, an amplitude of the vibration, and the like.
The target vibration frequency is used for indicating the vibration frequency of the target tower drum under the excited condition corresponding to the target video data;
the target vibration frequency is obtained according to the target video data, that is, the target vibration frequency may be used to indicate a vibration condition of a target tower in a time period corresponding to the target video data. That is, according to the target video data, the vibration condition of the target tower recorded in the target video data can be determined.
And step 203, comparing the target vibration frequency of the target tower drum with the original natural frequency of the target tower drum, and determining the safety performance of the target tower drum.
The raw natural frequency is indicative of a frequency of vibration of the target tower under the specified excited conditions.
Optionally, the original natural frequency is preset when the target tower leaves the factory.
When the target vibration frequency of the target tower shown in the target video data is determined according to the target video data, the target vibration frequency can be compared with the original natural frequency of the target tower to determine whether the target tower has frequency deviation.
Because the original natural frequency indicates the vibration frequency of the target tower under the specified excited condition, and when the target tower is in normal operation, when the tower of the wind driven generator is influenced by wind power, an air vortex is formed at the rear end of the wind driven generator, and the air vortex can cause the tower of the wind driven generator to vibrate, and the vibration frequency generated by the tower of the wind driven generator under the influence of the vortex under normal conditions should be fixed (namely, the original natural frequency), when the target vibration frequency deviates from the original natural frequency (namely, when the target tower has frequency deviation), it indicates that some parts of the target tower, even the whole tower, do not meet preset engineering parameters, and the target tower has potential safety hazard.
Therefore, when the vibration condition of the target tower in a specified time is determined according to the target video data, whether the target tower has frequency deviation in a specified time period can be determined by comparing the target vibration frequency with the original natural frequency, and therefore whether the target tower is safe can be determined.
In summary, the target video data acquired by the target tower drum is analyzed, so that the vibration frequency corresponding to the target tower drum can be obtained, and at this time, the vibration frequency of the target tower drum under the specified excited condition can be compared with the vibration frequency obtained according to the video analysis, so as to determine whether the performance of the target tower drum is greatly changed, so as to determine the safety of the target tower drum. Therefore, the safety performance of the target tower drum can be determined only by acquiring the video data of the target tower drum within the designated time, the free shaking of the tower drum is not required to be stimulated, and the detection efficiency of the safety of the tower drum is improved.
FIG. 3 is a method flow diagram illustrating a method for tower safety performance determination, according to an exemplary embodiment. The method is performed by a computer device, which may be the server 110 in the tower security determination system as shown in FIG. 1. As shown in fig. 3, the method for determining the tower safety performance may include the following steps:
The target video data is obtained by carrying out image acquisition on the target tower drum within a specified time period through image acquisition equipment. The target video data comprises video image frames which are sequenced based on image acquisition time, and the video image frames are used for recording the motion condition of the target tower drum at the acquisition time of the video image frames.
Optionally, the target video data further includes an environmental parameter; the environmental parameter is used for indicating the environmental information of the target tower drum when the target video is acquired.
When the image acquisition of the target tower drum is carried out through the image acquisition equipment, the environmental parameters in the target video data can be acquired through other sensor equipment in the image acquisition equipment at the same time, so that the environmental information of the target tower drum when the target video data is acquired can be recorded and recorded.
The motion condition of the target tower is easily affected by the surrounding environment, for example, extreme weather such as strong wind and high temperature may cause an unexpected influence on the motion process of the target tower, and the motion condition of the target tower under the extreme condition cannot directly represent the motion condition of the target tower under the normal operation condition. Therefore, when image acquisition of the target tower drum is carried out through the image acquisition equipment, the environmental parameters corresponding to the target video data are obtained, so that interference of accidental factors on the motion condition of the target tower drum is eliminated, and the accuracy of motion analysis of the target tower drum is improved.
Optionally, the environmental parameters include a wind direction and a wind speed in the target video data.
When the target tower is a tower of a wind turbine, the working environment of the target tower is usually in existence of a certain wind force, and the target tower vibrates along with the vortex formed by the wind force. Therefore, when the vibration condition of the target tower drum within the specified time is recorded through the target video data, the wind direction and the wind speed in the environment where the target tower drum is located can be recorded through the sensor device at the same time to serve as the working environment when the target tower drum vibrates.
Optionally, the environmental parameter further includes distance information between the target tower and the image acquisition device.
After the distance information of the image acquisition equipment is recorded, the size information of the target tower drum can be determined according to the parameters such as the focal length of the image acquisition equipment, so that the vibration amplitude of the target tower drum during vibration can be judged according to the size information of the target tower drum, and the vibration condition of the target tower drum can be recorded more accurately.
When the target vibration frequency of the target tower drum needs to be obtained, candidate vibration frequencies corresponding to the continuous video segments can be obtained through the continuous video segments in the target video data, so that errors caused by measurement can be reduced according to the candidate vibration frequencies, and the target vibration frequency closest to the real vibration frequency can be obtained.
In one possible implementation, the at least two candidate vibration frequencies include a first candidate vibration frequency; acquiring each continuous image frame in a first continuous video segment; extracting image characteristics of each continuous image frame to respectively obtain image characteristic points of each continuous image frame; and determining a first candidate vibration frequency corresponding to the first continuous video clip according to the distance information between the corresponding image characteristic points in each continuous image frame.
And the image feature points in the continuous frame images are points of which the pixel difference on the target tower drum meets specified conditions.
That is, image feature extraction is performed on each continuous image frame to obtain image feature points of each continuous image frame, which may be implemented by the following steps:
for a first image frame in each continuous image frame, acquiring the pixel value of each pixel point in the first image frame, and determining the pixel point of which the pixel value is higher than the pixel values of surrounding pixel points in the first image frame as an image characteristic point;
for a second image frame in each continuous image frame, taking the pixel value of each pixel point in the second image frame, and determining the pixel point of which the pixel value is higher than the pixel values of surrounding pixel points in the second image frame as an image characteristic point; the second image frame is a video image frame adjacent to the first image frame;
taking the image characteristic point which is closest to each image characteristic point of the first image frame in each image characteristic point of the second image frame as the characteristic point of the second image frame corresponding to the image characteristic point of the first image frame, thereby establishing the corresponding relation of the image characteristic points between the first image frame and the second image frame;
determining the movement condition of a target tower drum between the first image frame and the second image frame according to the distance information between the corresponding image feature points between the first image frame and the second image frame;
similarly, the motion condition of the target tower drum between the second image frame and the third image frame can be obtained, and when the motion condition of the target tower drum between each image frame is obtained, the vibration frequency of the target tower drum can be obtained.
Please refer to fig. 4, which illustrates a schematic diagram of a motion situation acquiring method according to an embodiment of the present application. When a first image frame in each continuous image frame is subjected to feature extraction, pixel points with pixel values higher than those of surrounding pixel points in the first image frame can be determined as image feature points, and a first feature map 401 containing each image feature point of the first image frame is obtained. Similarly, the image feature points of the first image frame in the second feature map 402 also indicate the position of the target tower at the image feature points in the second image frame.
The first feature map 401 and the second feature map 402 are fitted to obtain a fitted feature map 403, from the fitted feature map 403, the position relationship and the distance between the corresponding image feature points can be obtained, and the movement condition of the target tower between the first image frame and the second image frame can be determined according to the position relationship and the distance between the corresponding image feature points.
In a possible implementation manner, a tower vibration oscillogram corresponding to the first continuous video segment is constructed according to distance information between corresponding image feature points in each continuous image frame; and carrying out data processing on the tower vibration oscillogram corresponding to the first continuous video clip to obtain a first candidate vibration frequency corresponding to the first continuous video clip.
When the distance information between the corresponding image feature points in each continuous image frame is acquired, the motion condition of the target tower in the first continuous video segment can be known, so that a tower vibration oscillogram corresponding to the first continuous video segment is constructed to indicate the vibration condition of the target tower.
In a possible implementation manner, when distance information between corresponding image feature points in each continuous image frame is acquired, weighted average processing is performed according to the distance information between the corresponding image feature points in two consecutive frames in each continuous image frame to obtain the distance information between the two consecutive frame images, and a tower vibration oscillogram corresponding to the first continuous video segment is constructed according to the distance information between the consecutive frame images.
For example, for a first image frame and a second image frame in succession, there are five image feature points in the first image frame; there are also five corresponding image feature points in the second image frame, and at this time, the correspondence between the feature points between the first image frame and the second image frame may be determined, and the distance between the corresponding image feature points may be obtained. When the distances between the five pairs of image feature points are obtained, weighted averaging may be performed on the distances between the five pairs of image feature points (for example, direct averaging may be performed when all weights are set to 1, or the distance between the feature point and the center point of the target tower may be used as a weight), so as to obtain distance information between the first image frame and the second image frame.
In a possible implementation manner, when a tower drum vibration oscillogram is constructed according to the distance information between each continuous image frame, time-frequency analysis may be performed on the tower drum vibration oscillogram to obtain a frequency spectrum of the tower drum vibration oscillogram, and the vibration frequency of the tower drum vibration oscillogram is determined in the frequency spectrum of the vibration oscillogram.
Refer to FIG. 5, which illustrates a tower vibration frequency diagram according to an embodiment of the present application.
After the distance information between each continuous image frame of the continuous video segment is acquired, the vibration waveform 501 of the tower drum within the time of the continuous video segment can be constructed according to the distance information between the continuous image frames.
After the vibration waveform 501 of the tower is obtained, a time-frequency analysis (for example, fast fourier transform) may be performed on the vibration waveform map to obtain a frequency spectrum 502 of the tower, where the frequency spectrum 502 of the tower indicates a vibration frequency that may exist in the target tower. The frequency spectrum 502 of the tower shown in fig. 5 is a partial enlarged view obtained by enlarging and displaying a frequency spectrum curve with a frequency of about 0.5 (the frequency spectrum 502 of the tower actually may display the amplitude of each frequency from 0 scale, which is not shown in the figure), that is, the frequency spectrum 502 of the tower shown in fig. 5 is enlarged and displayed with a frequency of about 0.5, so as to more clearly represent the magnitude relationship between the frequency amplitudes with a frequency of about 0.5.
Optionally, after the frequency spectrogram of the tower drum is obtained through time-frequency analysis, the frequency with the maximum amplitude in the frequency spectrogram can be used as the target vibration frequency of the target tower drum.
In one possible implementation, an average or median between the at least two candidate vibration frequencies is determined, and the average or median between the candidate vibration frequencies is determined as the target vibration frequency.
In a possible implementation manner, the candidate vibration frequency, of the at least two candidate vibration frequencies, at which the environmental parameter of the corresponding continuous video segment meets the environmental threshold condition is determined as the available vibration frequency; and carrying out error elimination processing on the available vibration frequency, and determining the target vibration frequency.
Wherein the environmental threshold condition is used for indicating the credibility of the working environment of the target tower indicated by the continuous video segment.
For example, when the environmental threshold condition is that the wind speed is less than 20 meters per second, the environmental parameters of the continuous video segments indicate that the wind speed in the working environment of the target tower drum is less than 20 meters per second in the continuous video segments, the environmental parameters of the continuous video segments meet the environmental threshold condition, and the working environment of the target tower drum meets the preset working condition and is not affected by the extreme environment. Therefore, when the wind speed of the working environment of the target tower is less than 20 meters per second, the candidate vibration frequency of the target tower in the continuous video segment is credible, and the candidate vibration frequency is determined as the available vibration frequency.
For another example, when the environmental threshold condition is that the temperature is lower than 40 degrees, the continuous video segment may include temperature information (i.e., an environmental parameter) collected by a temperature sensor, and when the temperature sensor in the continuous video segment indicates that the temperature information is higher than 40 degrees, it is obvious that the target tower may have performance deviation due to high temperature, thereby affecting the confidence level of the candidate vibration frequency, and the environmental parameter may be considered not to satisfy the environmental threshold condition. When the temperature sensor in the continuous video segment indicates that the temperature information is lower than 40 degrees, the environmental parameter of the continuous video segment indicates that the target tower is in a reasonable working environment, so that the target vibration frequency corresponding to the continuous video segment can be determined as the available vibration frequency.
In one possible implementation, when multiple available vibration frequencies are obtained, measurement errors in the multiple available vibration frequencies may be eliminated by taking an average value to determine the target vibration frequency.
Optionally, when the multiple available vibration frequencies are obtained, the available vibration frequencies of the multiple available vibration frequencies, of which the vibration frequencies exceed the specified frequency range, may be deleted, and the remaining available vibration frequencies may be averaged to eliminate the system error and the measurement error in the available frequencies, so as to determine the target vibration frequency.
And 304, comparing the target vibration frequency of the target tower drum with the original natural frequency of the target tower drum, and determining the safety performance of the target tower drum.
The raw natural frequency is indicative of a frequency of vibration of the target tower under the specified excited conditions.
The tower barrel on the wind driven generator is a tower rod of the wind driven generator, and mainly plays a supporting role in the wind driven generator set and absorbs the vibration of the set. Under normal working environment, when the target tower receives excitation of different wind power, the generated vibration frequency only changes within a very small vibration frequency range and can be regarded as almost unchanged, and therefore, the original natural frequency is used for indicating the vibration frequency of the target tower in a normal working range.
When the target tower barrel has the problems of damaged parts and the like, the target vibration frequency generated when the target tower barrel is excited by wind power may deviate from the original natural frequency, so that the safety performance of the target tower barrel can be determined by comparing the target vibration frequency with the original natural frequency, and whether the target tower barrel has potential safety hazards or not can be judged.
In one possible implementation, when the difference between the target vibration frequency and the original natural frequency is within a first threshold range, determining the target tower as a safe state;
or,
when the difference between the target vibration frequency and the original natural frequency is within a second threshold value range, determining the target tower drum to be in an unsafe state;
wherein a maximum value of the first threshold range and the second threshold range is less than a measurement threshold.
When the difference between the target vibration frequency and the original natural frequency is within the first threshold range, it indicates that the vibration absorption condition of the target tower meets the condition in normal operation, and at this time, the target tower can be determined to be in a safe state.
Optionally, the first threshold range refers to being less than or equal to the first threshold. When the difference between the target vibration frequency and the original natural frequency is smaller than or equal to a first threshold, it indicates that the difference between the target vibration frequency and the original natural frequency is small, and the difference between the target vibration frequency and the original natural frequency is within a controllable range, so it can be considered that the target tower is in a safe state when the difference between the target vibration frequency and the original natural frequency is smaller than or equal to the first threshold.
When the difference between the target vibration frequency and the original natural frequency is within the second threshold value range, the vibration condition of the target tower drum is not satisfied with the condition in normal operation, and the target tower drum can be determined to be in an unsafe state.
Alternatively, the second threshold range may be a range greater than the first threshold and less than the measurement threshold.
When the difference between the target vibration frequency and the original natural frequency is greater than a first threshold and smaller than a measurement threshold, it is indicated that the deviation between the target vibration frequency and the original natural frequency exceeds a controllable range, and at this time, a potential safety hazard may exist in the target tower; when the difference between the target vibration frequency and the original natural frequency is greater than or equal to the measurement threshold, the difference between the target vibration frequency and the original natural frequency exceeds the vibration range of the target tower drum, so that the target vibration frequency obtained through the target video data may be abnormal, and at this time, the target vibration frequency corresponding to the target video data needs to be obtained again.
For example, the first threshold may be 1hz, the measurement threshold may be 10hz, and when the difference between the target vibration frequency and the original natural frequency is 0.5hz, that is, the difference between the target vibration frequency and the original natural frequency is less than or equal to the first threshold (within the first threshold range), the target tower may be considered to be in a safe state;
when the difference between the target vibration frequency and the original natural frequency is 5hz, the difference between the target vibration frequency and the original natural frequency is larger than a first threshold (1hz) and smaller than a measurement threshold (10hz), namely the difference between the target vibration frequency and the original natural frequency is within a second threshold range, and the target tower is in an unsafe state;
when the difference between the target vibration frequency and the original natural frequency is 15hz and is greater than the measurement threshold (10hz), the difference between the target vibration frequency and the original natural frequency exceeds the possible vibration range of the target tower, so that the target vibration frequency obtained through the target video data may be abnormal, and at this time, the target vibration frequency corresponding to the target video data needs to be obtained again.
In one possible implementation, the first threshold range is determined based on the replaced components in the target tower when the target tower contains the replaced components.
Optionally, when the first threshold range is less than or equal to the first threshold, the first threshold range may be determined only by determining the first threshold according to the replaced component in the tower.
When the target tower contains the replaced component, the replaced component in the target tower can be considered to be the detected component, and the component has no potential safety hazard. Comparing the target tower containing the replaced component with the target tower containing only the non-replaced component, when the vibration frequency offsets of the target tower and the target tower containing only the non-replaced component (i.e., the difference between the target vibration frequency and the original natural frequency) are both 10%, the target tower containing the non-replaced component may be caused by the loss of each non-replaced component; whereas a target tower containing a replaced component will experience a 10% vibration frequency offset due to only partial loss of the non-replaced component.
The vibration offset corresponding to the target tower with the replaced components exists, and the characterized loss is the loss of the part of the unchanged components, so that in order to avoid the potential safety hazard of the target tower caused by excessive loss of the part of the unchanged components, a first threshold value needs to be determined according to the replaced components of the tower.
In one possible implementation, the first threshold is determined by weighting the safety threshold according to a proportion of the replaced components of the tower.
For example, when the percentage of replaced components of the tower is 20%, then the first threshold value for the tower may be an 80% safety threshold value.
Alternatively, the proportion of the replaced components may be the proportion of the number of each component in the tower.
Alternatively, the proportion of the replaced component may be the impact proportion of the performance.
That is, each replaced component may have a different degree of impact on the performance of the tower, such as a bulky replaced component having a greater impact on the performance of the tower.
In summary, the target video data acquired by the target tower drum is analyzed, so that the vibration frequency corresponding to the target tower drum can be obtained, and at this time, the vibration frequency of the target tower drum under the specified excited condition can be compared with the vibration frequency obtained according to the video analysis, so as to determine whether the performance of the target tower drum is greatly changed, so as to determine the safety of the target tower drum. Therefore, the safety performance of the target tower drum can be determined only by acquiring the video data of the target tower drum within the designated time, the free shaking of the tower drum is not required to be stimulated, and the detection efficiency of the safety of the tower drum is improved.
After the wind turbine generator system is put into operation, the tower drum resonates with the impeller, cracks of the tower drum, a connecting bolt between the tower drums is loosened, the wind turbine foundation is connected loosely or the connection rigidity is insufficient, the manufacturing parameters and the design parameters of the tower drum are not consistent, the healthy operation of the tower drum can be threatened, meanwhile, the problems are not easy to find in the daily operation and inspection process of the wind turbine, and the wind turbine tower drum can operate continuously with diseases.
An important technical parameter of tower section of thick bamboo structure is the natural frequency of a tower section of thick bamboo, and through the hidden danger factor analysis discovery to influencing the operation of fan tower section of thick bamboo safety and stability, tower section of thick bamboo resonance, the crackle, connecting bolt is not hard up, basic connection rigidity is not enough etc., all can lead to the whole rigidity decline of a tower section of thick bamboo, and then lead to tower section of thick bamboo natural frequency to reduce, so for safety, the health condition of efficient monitoring wind turbine generator system tower section of thick bamboo, compare with the design natural frequency through monitoring wind turbine generator system tower section of thick bamboo natural frequency, and continuously pay attention to the trend of change of natural frequency, measure the frequency of rocking under the tower section of thick bamboo running state simultaneously, can directly reflect the health condition of a tower section of thick bamboo.
The conventional mode of monitoring tower section of thick bamboo natural frequency uses vibration detecting instrument, steps on the tower by the professional and measures after, for more accurate measuring tower section of thick bamboo all directions natural frequency, need through the mode of scram when the unit operation, arouses that the tower section of thick bamboo freely rocks the back by a wide margin and measures, and this kind of mode has very big potential safety hazard to the measurement personnel, and detection efficiency is lower moreover.
With the development of science and technology, the micro-vibration of equipment can be captured and vibration analysis can be carried out through the technology based on visual enhancement, the safety of detection personnel can be well guaranteed through non-contact monitoring, only a special high-speed camera is needed to be used for shooting a video file under the slight free swing of a unit, the detection on the safety performance of a tower can be completed through the technical scheme in the embodiment shown in fig. 3, and the working safety and the working efficiency are greatly improved.
FIG. 6 is a flow diagram illustrating a tower security determination, according to an exemplary embodiment. The tower safety performance determination method may be performed by the tower safety determination system shown in fig. 1, and may include the following steps.
And acquiring the environmental parameters of the image acquisition equipment when the image acquisition equipment acquires the continuous video clips through a temperature sensor, a wind sensor and the like corresponding to the image acquisition equipment. In addition, after the target tower to be detected is determined, factory parameters (i.e., including the original natural frequency) of the target tower may also be acquired, so that the target tower may be detected later.
And step 620, acquiring vibration video data of the tower.
After the parameter information of the target tower drum is determined, video data of the target tower drum can be acquired through the image acquisition equipment, and a plurality of continuous video clips of the target tower drum in a specified time period are acquired.
And step 630, issuing a tower safety report.
After a plurality of continuous video segments of the target tower in a specified time period are obtained, video data processing may be performed on the plurality of continuous video segments through the technical scheme described in the embodiment shown in fig. 3, so as to obtain the target vibration frequency of the target tower.
After the target vibration frequency of the target tower is obtained, the target vibration frequency and the obtained original natural frequency of the target tower can be analyzed to see whether the measured value (i.e., the target vibration frequency) is highly consistent with the theoretical value (i.e., the original vibration frequency). And a tower barrel safety report is issued according to the theoretical value and the measured value. Namely, when the theoretical value is matched with the measured value, the target tower drum is considered to be in a safe state, and when the matching degree of the theoretical value and the measured value is low, the target tower drum is considered to be in an unsafe state, so that potential safety hazards exist.
FIG. 7 is a block diagram illustrating a configuration of a tower security capability determination apparatus in accordance with an exemplary embodiment. This tower section of thick bamboo security performance confirms device includes:
a video data obtaining module 701, configured to obtain target video data; the target video data is used for indicating the vibration condition of the target tower drum within a specified time;
a vibration frequency obtaining module 702, configured to perform data processing on the target video data to obtain a target vibration frequency of the target tower; the target vibration frequency is used for indicating the vibration frequency of the target tower drum under the excited condition corresponding to the target video data;
a safety performance determining module 703, configured to compare a target vibration frequency of the target tower and an original natural frequency of the target tower, and determine the safety performance of the target tower; the original natural frequency is used for indicating the vibration frequency of the target tower under the specified excited condition.
In one possible implementation, the security performance determination module is configured to,
when the difference between the target vibration frequency and the original natural frequency is within a first threshold range, determining the target tower drum as a safe state;
or,
when the difference between the target vibration frequency and the original natural frequency is within a second threshold value range, determining the target tower drum to be in an unsafe state;
wherein a maximum of the first threshold range and the second threshold range is less than a measurement threshold.
In one possible implementation, when the target tower includes a replaced component, the safety performance determination module further includes:
a first threshold determination unit configured to determine the first threshold according to a replaced component in the target tower.
In a possible implementation manner, the target video data further includes an environmental parameter; the environment parameter is used for indicating the environment information of the target tower drum when the target video is obtained;
the vibration frequency acquisition module includes:
the candidate vibration acquisition unit is used for performing data processing on at least two sections of continuous video clips in the target video data to respectively acquire at least two candidate vibration frequencies of the target tower;
and the target vibration determining unit is used for processing the at least two candidate vibration frequencies according to the environment parameters of the continuous video clips corresponding to the candidate vibration frequencies respectively to determine the target vibration frequency.
In a possible implementation manner, the vibration frequency obtaining module further includes:
determining the candidate vibration frequency of the at least two candidate vibration frequencies, wherein the environment parameter of the corresponding continuous video clip meets the environment threshold condition, as an available vibration frequency;
and carrying out error elimination processing on the available vibration frequency, and determining the target vibration frequency.
In one possible implementation manner, the at least two candidate vibration frequencies include a first candidate vibration frequency;
the candidate vibration acquisition unit includes:
a continuous frame image acquisition subunit, configured to acquire each continuous image frame in the first continuous video segment;
the image feature extraction subunit is used for performing image feature extraction on each continuous image frame to respectively obtain image feature points of each continuous image frame;
and the candidate vibration obtaining subunit is configured to determine a first candidate vibration frequency corresponding to the first continuous video segment according to distance information between corresponding image feature points in each continuous image frame.
In summary, the target video data acquired by the target tower drum is analyzed, so that the vibration frequency corresponding to the target tower drum can be obtained, and at this time, the vibration frequency of the target tower drum under the specified excited condition can be compared with the vibration frequency obtained according to the video analysis, so as to determine whether the performance of the target tower drum is greatly changed, so as to determine the safety of the target tower drum. Therefore, the safety performance of the target tower drum can be determined only by acquiring the video data of the target tower drum within the designated time, the free shaking of the tower drum is not required to be stimulated, and the detection efficiency of the safety of the tower drum is improved.
Fig. 8 illustrates a block diagram of a computer device 800 according to an exemplary embodiment of the present application. The computer device may be implemented as a server in the above-mentioned aspects of the present application. The computer apparatus 800 includes a Central Processing Unit (CPU) 801, a system Memory 804 including a Random Access Memory (RAM) 802 and a Read-Only Memory (ROM) 803, and a system bus 805 connecting the system Memory 804 and the CPU 801. The computer device 800 also includes a mass storage device 806 for storing an operating system 809, application programs 810 and other program modules 811.
The mass storage device 806 is connected to the central processing unit 801 through a mass storage controller (not shown) connected to the system bus 805. The mass storage device 806 and its associated computer-readable media provide non-volatile storage for the computer device 800. That is, the mass storage device 806 may include a computer-readable medium (not shown) such as a hard disk or Compact Disc-Only Memory (CD-ROM) drive.
Without loss of generality, the computer readable media may comprise computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes RAM, ROM, Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), flash Memory or other solid state Memory technology, CD-ROM, Digital Versatile Disks (DVD), or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage, or other magnetic storage devices. Of course, those skilled in the art will appreciate that the computer storage media is not limited to the foregoing. The system memory 804 and mass storage device 806 as described above may be collectively referred to as memory.
The computer device 800 may also operate as a remote computer connected to a network via a network, such as the internet, in accordance with various embodiments of the present disclosure. That is, the computer device 800 may be connected to the network 808 through the network interface unit 807 attached to the system bus 805, or may be connected to another type of network or remote computer system (not shown) using the network interface unit 807.
The memory further includes at least one computer program, which is stored in the memory, and the central processing unit 801 executes the at least one computer program to implement all or part of the steps of the methods according to the above embodiments.
In an exemplary embodiment, a computer readable storage medium is also provided for storing at least one computer program, which is loaded and executed by a processor to implement all or part of the steps of the above method. For example, the computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a Compact Disc Read-Only Memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.
In an exemplary embodiment, a computer program product or a computer program is also provided, which comprises computer instructions, which are stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computer device to perform all or part of the steps of the method described in any of the embodiments of fig. 2 or fig. 3.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. A tower safety performance determination method, characterized in that the method comprises:
acquiring target video data; the target video data is used for indicating the vibration condition of the target tower drum within a specified time;
processing data of at least two sections of continuous video clips in the target video data to respectively obtain at least two candidate vibration frequencies of the target tower drum;
processing the at least two candidate vibration frequencies according to the environment parameters of the continuous video clips respectively corresponding to the candidate vibration frequencies, and determining the target vibration frequency of the target tower drum; the target vibration frequency is used for indicating the vibration frequency of the target tower drum under the excited condition corresponding to the target video data; the target video data also comprises environmental parameters; the environment parameter is used for indicating the environment information of the target tower drum when the target video is obtained;
comparing the target vibration frequency of the target tower drum with the original natural frequency of the target tower drum, and determining the safety performance of the target tower drum; the original natural frequency is used for indicating the vibration frequency of the target tower drum under a specified excited condition;
wherein the processing the at least two candidate vibration frequencies according to the environment parameters of the continuous video segments respectively corresponding to the candidate vibration frequencies to determine the target vibration frequency of the target tower drum includes:
determining the candidate vibration frequency of the at least two candidate vibration frequencies, the environment parameter of the corresponding continuous video clip meeting the environment threshold condition, as an available vibration frequency;
and carrying out error elimination processing on the available vibration frequency, and determining a target vibration frequency.
2. The method as claimed in claim 1, wherein the comparing the target vibration frequency of the target tower and the original natural frequency of the target tower to determine the safety performance of the target tower comprises:
when the difference between the target vibration frequency and the original natural frequency is within a first threshold range, determining the target tower drum as a safe state;
or,
when the difference between the target vibration frequency and the original natural frequency is within a second threshold value range, determining the target tower barrel as an unsafe state;
wherein a maximum of the first threshold range and the second threshold range is less than a measurement threshold.
3. The method as claimed in claim 2, wherein when the target tower contains a replaced component; the method further comprises the following steps:
determining the first threshold range based on the replaced components in the target tower.
4. The method according to any one of claims 1 to 3, wherein the at least two candidate vibration frequencies comprise a first candidate vibration frequency;
the data processing of at least two sections of continuous video clips in the target video data to respectively obtain at least two candidate vibration frequencies of the target tower cylinder includes:
acquiring each continuous image frame in a first continuous video segment;
extracting image features of each continuous image frame to respectively obtain image feature points of each continuous image frame;
and determining a first candidate vibration frequency corresponding to the first continuous video clip according to the distance information between the corresponding image feature points in each continuous image frame.
5. The method according to claim 4, wherein the determining the first candidate vibration frequency corresponding to the first continuous video segment according to the distance information between the corresponding image feature points in the respective continuous image frames comprises:
constructing a tower vibration oscillogram corresponding to the first continuous video clip according to the distance information between the corresponding image characteristic points in each continuous image frame;
and carrying out data processing on the tower vibration oscillogram corresponding to the first continuous video clip to obtain a first candidate vibration frequency corresponding to the first continuous video clip.
6. A tower safety determination apparatus, the apparatus comprising:
the video data acquisition module is used for acquiring target video data; the target video data is used for indicating the vibration condition of the target tower drum within a specified time;
the vibration frequency acquisition module is used for carrying out data processing on at least two sections of continuous video clips in the target video data and respectively acquiring at least two candidate vibration frequencies of the target tower drum;
the vibration frequency acquisition module is further used for processing the at least two candidate vibration frequencies according to the environment parameters of the continuous video clips respectively corresponding to the candidate vibration frequencies to determine a target vibration frequency of the target tower drum; the target vibration frequency is used for indicating the vibration frequency of the target tower drum under the excited condition corresponding to the target video data; the target video data also comprises environmental parameters; the environment parameter is used for indicating the environment information of the target tower barrel when the target video is obtained;
the safety performance determining module is used for comparing the target vibration frequency of the target tower drum with the original natural frequency of the target tower drum and determining the safety performance of the target tower drum; the original natural frequency is used for indicating the vibration frequency of the target tower drum under a specified excited condition;
the vibration frequency obtaining module is further configured to determine, as an available vibration frequency, a candidate vibration frequency of the at least two candidate vibration frequencies, where an environmental parameter of a corresponding continuous video segment meets an environmental threshold condition;
and carrying out error elimination processing on the available vibration frequency, and determining a target vibration frequency.
7. A computer device, characterized in that the computer device comprises a processor and a memory, wherein at least one instruction is stored in the memory, and the at least one instruction is loaded and executed by the processor to implement the tower security performance determination method as claimed in any one of claims 1 to 5.
8. A computer-readable storage medium having stored thereon at least one instruction which is loaded and executed by a processor to implement the tower security performance determination method of any of claims 1 to 5.
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