CN113638852A - Device and method for monitoring inclination of fan tower barrel - Google Patents
Device and method for monitoring inclination of fan tower barrel Download PDFInfo
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- CN113638852A CN113638852A CN202110984582.1A CN202110984582A CN113638852A CN 113638852 A CN113638852 A CN 113638852A CN 202110984582 A CN202110984582 A CN 202110984582A CN 113638852 A CN113638852 A CN 113638852A
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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
Abstract
The invention discloses a fan tower inclination monitoring device and method, and belongs to the technical field of new energy power generation. The first rigid connecting rod is hinged with the bottom of the fan tower barrel through a first hinge arranged below the horizontal ground; the two ends of the lever are respectively hinged with the first rigid connecting rod and the second rigid connecting rod, the first rigid connecting rod and the second rigid connecting rod are positioned on the same side of the lever, and the arm lengths of the first rigid connecting rod and the second rigid connecting rod are equal; the second rigid connecting rod is fixedly connected with the double-slit screen; the single-color light source, the single-slit screen, the double-slit screen and the receiving screen are sequentially arranged, the single-color light emitted by the single-color light source is diffracted into coherent light through the single-slit screen, and interference fringes with alternate light and shade are formed on the receiving screen after the interference of the double-slit screen; the camera continuously monitors the interference fringes and is connected with a computer. The invention can improve the monitoring precision and sensitivity of the wind turbine tower and improve the safety of the wind turbine tower.
Description
Technical Field
The invention belongs to the technical field of new energy power generation, and particularly relates to a fan tower inclination monitoring device and method.
Background
In recent years, wind turbine tower collapse accidents frequently occur, and severe negative social influences can be generated while huge economic losses are brought to wind power enterprises. From the source of wind turbine tower inversion, foundation cracking, tower inclination, uneven settlement and the like are the most important reasons; the potential safety hazards are a long gradual change process, particularly the inclination of a tower drum, and are difficult to accurately find through observation of human eyes. Therefore, timely and effective monitoring and measurement of the inclination of the tower barrel are main solutions for avoiding wind turbine tower collapse.
The existing device for monitoring the inclination of the tower barrel of the fan mainly adopts an inclination angle sensor, but the mode also has certain defects, and the requirement on the accuracy and the long-term stability of the sensor is high. In recent years, image recognition technology is applied to the field of wind turbine tower monitoring. However, the disadvantage of the tower inclination determination by simply using the image recognition technology is that the requirement on the resolution of the picture is high, and the small displacement at the early stage of the wind turbine tower is difficult to be reflected obviously through the image.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a device and a method for monitoring the inclination of a wind turbine tower, which can improve the monitoring accuracy and sensitivity of the wind turbine tower and improve the safety of the wind turbine tower.
The invention is realized by the following technical scheme:
the invention discloses a fan tower inclination monitoring device which comprises a first hinge, a first rigid connecting rod, a receiving screen, a monochromatic light source, a single-slit screen, a double-slit screen, a camera, a computer, a lever and a second rigid connecting rod, wherein the first hinge is connected with the receiving screen;
the first rigid connecting rod is hinged with the bottom of the fan tower barrel through a first hinge arranged below the horizontal ground; the two ends of the lever are respectively hinged with the first rigid connecting rod and the second rigid connecting rod, the first rigid connecting rod and the second rigid connecting rod are positioned on the same side of the lever, and the arm lengths of the first rigid connecting rod and the second rigid connecting rod are equal; the second rigid connecting rod is fixedly connected with the double-slit screen; the single-color light source, the single-slit screen, the double-slit screen and the receiving screen are sequentially arranged, the single-color light emitted by the single-color light source is diffracted into coherent light through the single-slit screen, and interference fringes with alternate light and shade are formed on the receiving screen after the interference of the double-slit screen; the camera continuously monitors the interference fringes and is connected with a computer.
Preferably, the receiving screen, the monochromatic light source, the single-slit screen, the double-slit screen and the camera are all arranged in the monitoring room, and the monitoring room is fixedly connected with the ground.
Preferably, the width of the double slit screen is less than or equal to 0.1 mm.
Preferably, the distance between the double-slit screen and the receiving screen is L, the distance between the centers of the double slits on the double-slit screen is d, and L/d is more than 50.
Preferably, the wavelength of the monochromatic light emitted by the monochromatic light source is 390-710 nm.
Preferably, the number of bright stripes in the field of view of the camera is greater than or equal to 4.
Preferably, the camera is mounted with a microscope lens.
The invention discloses a method for monitoring the inclination of a fan tower drum by adopting the fan tower drum inclination monitoring device, which comprises the following steps:
the monochromatic light source continuously emits monochromatic light, the monochromatic light is diffracted into coherent light through the single slit screen, interference fringes with alternate light and shade are formed on the receiving screen after the interference of the double slit screen, and the interference fringes are continuously monitored by the camera; when the tower barrel is inclined, the first hinge and the first rigid connecting rod are displaced, and after the displacement is subjected to leverage, the second rigid connecting rod is also displaced, so that the position of the double-slit screen is driven to change, the distance between the double-slit screen and the receiving screen is changed, and the distance between light and dark stripes on the receiving screen is changed; and capturing information of the change of the distance between the light and the dark stripes by the camera, sending the information to the computer, and calculating to obtain the angular displacement value of the tower drum of the fan.
Preferably, the distance between the double-slit screen and the receiving screen is L, the distance between the centers of the double slits on the double-slit screen is d, and the distance between the centers of two adjacent bright stripes
When the wind turbine tower barrel inclines and displaces delta h, the distance between the centers of two corresponding adjacent bright stripes changes
Preferably, a plurality of sets of the wind turbine tower inclination monitoring devices are circumferentially and uniformly distributed at the same depth below the wind turbine tower.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a fan tower cylinder inclination monitoring device, which is based on the light double-slit interference theory, and is used for establishing a connection between the bottom inclination displacement of a tower cylinder and the plane displacement of double slits, wherein the distance between light and dark stripes on a receiving screen is changed due to the change of the distance from the double slits to the receiving screen, and the inclination displacement condition of the tower cylinder can be reversely deduced by measuring the change of the stripe distance. The device disclosed by the invention has the advantages that the inclination monitoring of the fan tower drum is realized by utilizing an optical measurement method, the device has higher measurement precision compared with other modes, the device is simple to construct, the cost of each part is lower, the realization is easy, the monitoring precision and sensitivity of the fan tower drum can be obviously improved, and the safety of the fan tower drum is improved.
Furthermore, the receiving screen, the monochromatic light source, the single-slit screen, the double-slit screen and the camera are arranged in the monitoring room, so that all components can be protected, and meanwhile, the interference of surrounding stray signals is avoided.
Furthermore, the slit width of the double slit screen is less than or equal to 0.1mm, so that the wavelength of incident light is ensured to be in a comparable range, and the interference phenomenon is more obvious.
Furthermore, the ratio of the distance between the double-slit screen and the receiving screen to the distance between the double slits on the double-slit screen is more than 50, so that the measurement result has higher resolution.
Furthermore, the wavelength of the monochromatic light emitted by the monochromatic light source is 390-710 nm, so that the optical signal is easier to capture by a camera.
Further, the number of bright stripes in the visual field of the camera is more than or equal to 4, so that the accuracy of the measurement result is ensured.
Furthermore, the camera is provided with the microscope lens, so that the resolution of the monitoring camera can be improved, and the monitoring precision is improved.
The method for monitoring the inclination of the fan tower drum by adopting the fan tower drum inclination monitoring device disclosed by the invention can effectively improve the monitoring accuracy and sensitivity of the fan tower drum and the safety of the fan tower drum, and has a good application prospect.
Furthermore, a plurality of sets of devices are circumferentially and uniformly distributed at the same depth below the fan tower drum, so that the inclined displacement of the fan tower drum in different directions can be monitored.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the measurement principle of the present invention;
fig. 3 is a schematic view of the working process of the present invention.
In the figure: 1-a fan tower; 2-horizontal ground; 3-a first hinge; 4-a first rigid connecting rod; 5-a receiving screen; 6-a monochromatic light source; 7-single slit screen; 8-double slit screen; 9-a camera; 10-a monitoring room; 11-a data transmission line; 12-a computer; 13-a second hinge; 14-a third hinge; 15-a lever; 16-second rigid connecting rod.
Detailed Description
Based on the optical interference theory, two or more rows of light waves are mutually superposed when meeting in space, and are always strengthened in some regions and always weakened in other regions to form a stable strong and weak distribution phenomenon. The invention utilizes the principle to measure the tiny displacement of the inclination of the fan tower barrel 1.
The invention will now be described in further detail with reference to the following drawings and specific examples, which are intended to be illustrative and not limiting:
referring to fig. 1, in the wind turbine tower inclination monitoring device of the present invention, a monitoring room 10 is disposed within 20cm near the bottom of the wind turbine tower 1 for arranging a light path, and the size of the monitoring room 10 is preferably such that the light path can be arranged. The bottom of the fan tower barrel 1 is provided with a first hinge 3, the first hinge 3 is arranged below the horizontal ground 2, and the first hinge 3 is connected with a first rigid connecting rod 4. The monochromatic light source 6 with fixed wavelength is arranged at the top of the monitoring chamber 10, and the monochromatic light emitted by the monochromatic light source 6 firstly passes through the single slit screen 7 and is diffracted into coherent light through the single slit S. After the coherent light passes through the double-slit screen 8, the coherent light forms alternate light and dark stripes on the receiving screen 5 after double-slit interference. The single slit screen 7 and the receiving screen 5 are fixed to the inner wall surface of the monitoring chamber 10. Since the monitoring room 10 is fixed on the ground near the wind turbine tower 1, it can be considered that when the wind turbine tower 1 is in an inclined displacement, the position of the monitoring room 10 does not change, that is, the positions of the single slit screen 7 and the receiving screen 5 do not change. The double slit screen 8 is fixed to a second rigid connecting rod 16. The first rigid connecting rod 4 and the second rigid connecting rod 16 are connected with the lever 15 through the second hinge 13 and the third hinge 14, respectively. When the wind turbine tower barrel 1 inclines, the first hinge 3 and the first rigid connecting rod 4 displace delta h, the displacement is converted into the displacement of the second rigid connecting rod 16 through the lever 15, and the position of the double-slit screen 8 correspondingly changes, so that the distance from the double slit to the receiving screen 5 changes. The lever 15 has equal arm length at both ends and performs reverse equivalent transmission on the generated displacement. According to the principle of double-slit interference, the distance between the double slits and the receiving screen 5 is changed, so that the distance between light and dark stripes on the receiving screen 5 is changed. The oblique displacement information of the wind turbine tower 1 can be obtained by capturing the information of the light and dark stripes on the receiving screen 5.
As shown in fig. 3, when in actual use, the monitorAfter the measuring device is installed according to the structure, the distance between each part is adjusted. The camera is mounted directly below the lower receiving screen 5 of the monitoring room 10. Information of the light and dark stripes on the receiving screen 5 is captured by the camera 9. For more accurate results, the camera 9 is typically used with a microscope. Firstly, calibrating a measuring view field of the camera 9, and determining the actual distance corresponding to each pixel point on an acquired image. The field of view of the camera 9 is adjusted so that at least 4 bright stripes appear inside the field of view. When the distance between the two slits is d and the distance between the double slit screen 8 and the receiving screen 5 is L, the distance between the centers of the two adjacent bright stripes
As shown in fig. 2. The field of view of the camera 9 is calibrated, and the resolution of the image captured by the camera 9, i.e. the actual distance corresponding to each pixel, is determined. When the wind turbine tower barrel 1 is inclined and displaced by delta h, the distance between the centers of two corresponding adjacent bright stripes changes
Through measuring Δ x, the calculation of the inclination displacement Δ h of the wind turbine tower 1 can be realized.
It should be noted that the width of the slit on the double slit screen 8 is comparable to the wavelength of light, and the slit width is generally not more than 0.1 mm. In order to obtain a high resolution of the measurement results, the ratio of the distance L between the double slit screen 8 and the receiving screen 5 to the distance d between the two slits is greater than 50. In order to make the optical signal easier to be captured by the camera 9, the wavelength of the monochromatic light is between 390-710 nm in the visible light range.
The data captured by the camera 9 is transmitted to the computer 12 through the data transmission line 11, and the computer 12 processes the obtained interference image data through an image recognition technology and automatically calculates to obtain the inclination displacement delta h of the fan tower 1. When Δ h exceeds the security domain value set by the system, the computer 12 issues an alarm.
In order to measure the inclination of the wind turbine tower 1 from multiple directions, a set of monitoring device of the invention is respectively installed at the bottom of the wind turbine tower 1 every 90 degrees. Signals of the four sets of monitoring devices are all accessed into the computer 12, and the computer 12 respectively calculates and processes data and judges the settlement displacement condition of the tower drum 1 of the wind turbine in each direction. If the inclined displacement of a certain position exceeds the safety threshold, alarming and prompting the inclined position.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (10)
1. The device for monitoring the inclination of the tower cylinder of the fan is characterized by comprising a first hinge (3), a first rigid connecting rod (4), a receiving screen (5), a monochromatic light source (6), a single-slit screen (7), a double-slit screen (8), a camera (9), a computer (12), a lever (15) and a second rigid connecting rod (16);
the first rigid connecting rod (4) is hinged with the bottom of the fan tower cylinder (1) through a first hinge (3) arranged below the horizontal ground; two ends of the lever (15) are respectively hinged with the first rigid connecting rod (4) and the second rigid connecting rod (16), the first rigid connecting rod (4) and the second rigid connecting rod (16) are positioned on the same side of the lever (15), and the arm lengths of the first rigid connecting rod and the second rigid connecting rod are equal; the second rigid connecting rod (16) is fixedly connected with the double-slit screen (8); the monochromatic light source (6), the single slit screen (7), the double slit screen (8) and the receiving screen (5) are sequentially arranged, the monochromatic light emitted by the monochromatic light source (6) is diffracted into coherent light through the single slit screen (7), and interference fringes with alternate light and shade are formed on the receiving screen (5) after the interference of the double slit screen (8); the interference fringes are continuously monitored by a camera (9), and the camera (9) is connected with a computer (12).
2. The wind turbine tower inclination monitoring device according to claim 1, wherein the receiving screen (5), the monochromatic light source (6), the single slit screen (7), the double slit screen (8) and the camera (9) are all arranged in a monitoring room (10), and the monitoring room (10) is fixedly connected with the ground.
3. The wind turbine tower inclination monitoring device according to claim 1, wherein the width of the double slit screen (8) is less than or equal to 0.1 mm.
4. The wind turbine tower inclination monitoring device according to claim 1, wherein the distance between the double slit screen (8) and the receiving screen (5) is L, the distance between the centers of the double slits on the double slit screen (8) is d, and L/d > 50.
5. The wind turbine tower inclination monitoring device according to claim 1, wherein the monochromatic light source (6) emits monochromatic light with a wavelength of 390-710 nm.
6. The wind turbine tower inclination monitoring device according to claim 1, wherein the number of bright stripes in the field of view of the camera (9) is greater than or equal to 4.
7. The wind turbine tower inclination monitoring device according to claim 1, characterised in that the camera (9) is fitted with a micro lens.
8. The method for monitoring the inclination of the wind turbine tower by using the wind turbine tower inclination monitoring device as claimed in any one of claims 1 to 7 is characterized by comprising the following steps:
the monochromatic light source (6) continuously emits monochromatic light, the monochromatic light is diffracted into coherent light through the single-slit screen (7), interference is carried out through the double-slit screen (8), light and shade alternate interference fringes are formed on the receiving screen (5), and the interference fringes are continuously monitored by the camera (9); when the tower barrel inclines, the first hinge (3) and the first rigid connecting rod (4) displace, and after the displacement is acted by the lever (15), the second rigid connecting rod (16) also displaces, and simultaneously drives the position of the double-slit screen (8) to change, so that the distance between the double-slit screen (8) and the receiving screen (5) changes, and the distance between light and dark stripes on the receiving screen (5) changes; the camera (9) captures information of the change of the distance between the light stripe and the dark stripe and sends the information to the computer (12), and the inclination displacement value of the fan tower barrel (1) is obtained through calculation.
9. According to the rightThe method for monitoring the inclination of the fan tower drum by adopting the device for monitoring the inclination of the fan tower drum as claimed in claim 8, wherein the distance between the double-slit screen (8) and the receiving screen (5) is L, the distance between the centers of the double slits on the double-slit screen (8) is d, and the distance between the centers of two adjacent bright stripes
When the wind turbine tower barrel (1) is inclined and displaced by delta h, the distance between the centers of two corresponding adjacent bright stripes changes
10. The method for monitoring the inclination of the wind turbine tower by using the wind turbine tower inclination monitoring device according to claim 8, wherein a plurality of sets of the wind turbine tower inclination monitoring devices are circumferentially and uniformly distributed at the same depth below the wind turbine tower (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110984582.1A CN113638852A (en) | 2021-08-25 | 2021-08-25 | Device and method for monitoring inclination of fan tower barrel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110984582.1A CN113638852A (en) | 2021-08-25 | 2021-08-25 | Device and method for monitoring inclination of fan tower barrel |
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| CN113638852A true CN113638852A (en) | 2021-11-12 |
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| CN202110984582.1A Pending CN113638852A (en) | 2021-08-25 | 2021-08-25 | Device and method for monitoring inclination of fan tower barrel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109733A (en) * | 2021-11-23 | 2022-03-01 | 北京华能新锐控制技术有限公司 | Wind turbine generator system tower section of thick bamboo detection device |
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| JP2000205819A (en) * | 1999-01-13 | 2000-07-28 | Olympus Optical Co Ltd | Optical displacement sensor |
| CN101183017A (en) * | 2007-12-07 | 2008-05-21 | 华中科技大学 | Laser phase grating interference displacement sensor |
| CN107421464A (en) * | 2017-07-25 | 2017-12-01 | 苏州大学 | High-precision interference-type dibit phase grating displacement transducer for measuring surface form |
| CN112414455A (en) * | 2020-11-08 | 2021-02-26 | 华能通辽风力发电有限公司 | System and method for distinguishing deformation and foundation settlement of wind turbine tower |
| CN113250916A (en) * | 2021-06-29 | 2021-08-13 | 中国华能集团清洁能源技术研究院有限公司 | Fan tower barrel inclination monitoring device and method based on light interference |
-
2021
- 2021-08-25 CN CN202110984582.1A patent/CN113638852A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000205819A (en) * | 1999-01-13 | 2000-07-28 | Olympus Optical Co Ltd | Optical displacement sensor |
| CN101183017A (en) * | 2007-12-07 | 2008-05-21 | 华中科技大学 | Laser phase grating interference displacement sensor |
| CN107421464A (en) * | 2017-07-25 | 2017-12-01 | 苏州大学 | High-precision interference-type dibit phase grating displacement transducer for measuring surface form |
| CN112414455A (en) * | 2020-11-08 | 2021-02-26 | 华能通辽风力发电有限公司 | System and method for distinguishing deformation and foundation settlement of wind turbine tower |
| CN113250916A (en) * | 2021-06-29 | 2021-08-13 | 中国华能集团清洁能源技术研究院有限公司 | Fan tower barrel inclination monitoring device and method based on light interference |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109733A (en) * | 2021-11-23 | 2022-03-01 | 北京华能新锐控制技术有限公司 | Wind turbine generator system tower section of thick bamboo detection device |
| CN114109733B (en) * | 2021-11-23 | 2023-10-27 | 北京华能新锐控制技术有限公司 | Wind turbine generator system tower section of thick bamboo detection device |
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