CN112942450A - Method and system for monitoring fatigue damage of foundation ring type fan - Google Patents
Method and system for monitoring fatigue damage of foundation ring type fan Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The embodiment of the invention provides a method and a system for monitoring fatigue damage of a foundation ring type fan foundation, and relates to the field of fan foundation fatigue monitoring systems. Aims to improve the effect of determining the fatigue damage of the foundation ring type fan. The method comprises the steps of obtaining the rotating speed of a hub representing the bottom load of a fan tower; acquiring the levelness of the foundation ring; and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring according to the rotating speed and the levelness of the hub. The fatigue damage monitoring system for the foundation of the foundation ring type wind turbine comprises a foundation ring, a detector and a controller, wherein the detector and the controller are in mutual communication. The equivalent flexibility coefficient obtained through the equivalent load hub rotating speed and the levelness can feed back the basic damage degree of the fan more accurately, and the damage assessment effect is improved.
Description
Technical Field
The invention relates to the field of a fan foundation fatigue monitoring system, in particular to a method and a system for monitoring fatigue damage of a foundation ring type fan foundation.
Background
With the annual increase of the time for putting the wind turbine into operation, the traditional foundation ring type wind turbine foundation generally has the phenomenon of concrete damage caused by wind-induced fatigue. The main performance is as follows: firstly, a large separation crack exists between a main wind direction foundation ring and concrete; secondly, crushing peripheral concrete of a main wind direction foundation ring (the foundation ring is a section of the lowest surface of a wind turbine tower cylinder embedded into the concrete), and expanding the range of a crushing area downwards and outwards year by year; thirdly, the tower barrel of the wind turbine generator generates inclined swing due to the looseness of the lower part, so that the peripheral concrete of the foundation ring forms powder due to looseness and abrasion, and a slurry bleeding phenomenon is generated after water enters from the cracks; fourthly, the steel bars penetrating the cylinder on the windward side of the main wind direction are in contact collision with the foundation ring due to the looseness of the tower cylinder, so that serious fatigue brittle failure is caused. Fifthly, the concrete around the flange below the main wind direction foundation ring forms a cavity after long-term abrasion.
The fan foundation damage is a gradual change and hidden process which is not easy to discover manually. If the foundation damage is not found timely, great risk is brought to the normal and safe operation of the fan. The manual field detection is high in cost, limited by factors such as seasons and topography, large in detection data contingency, not comprehensive enough, and incapable of finding problems in time.
Disclosure of Invention
The invention aims to provide a method for monitoring the fatigue damage of the foundation of the ring type wind turbine, which can improve the effect of damage assessment on the fatigue damage of the foundation of the ring type wind turbine.
The invention also aims to provide a system for monitoring the fatigue damage of the foundation ring type wind turbine, which can improve the effect of determining the fatigue damage of the foundation ring type wind turbine foundation.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a method for monitoring fatigue damage of a foundation ring type fan, which comprises the following steps:
acquiring the rotating speed of a hub representing the bottom load of a fan tower;
acquiring the levelness of the foundation ring;
and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the basic ring according to the rotating speed of the hub and the levelness.
In addition, the method for monitoring the fatigue damage of the foundation ring type wind turbine provided by the embodiment of the invention also has the following additional technical characteristics:
optionally, the step of obtaining the levelness of the foundation ring includes:
acquiring a first position parameter representing the highest point position of the foundation ring and a second position parameter representing the lowest point position of the foundation ring;
and obtaining the levelness of the basic ring according to the first position parameter and the second position parameter.
Optionally, the method for monitoring fatigue damage of the foundation of the ring wind turbine further includes:
acquiring a wind direction angle and a yaw error;
the step of obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring according to the rotating speed of the hub and the levelness comprises the following steps:
and obtaining the equivalent flexibility coefficient representing the fatigue damage degree of the preset position in the circumferential direction of the foundation ring according to the wind direction angle, the yaw error, the hub rotating speed, the first position parameter and the second position parameter.
Optionally, the step of obtaining the hub rotation speed representing the bottom load of the tower of the wind turbine includes:
acquiring a plurality of hub rotating speeds in a preset time period;
the step of obtaining a first position parameter representing a highest point position of the foundation ring and a second position parameter representing a lowest point position of the foundation ring comprises:
acquiring a plurality of first position parameters and a plurality of second position parameters within the preset time period;
the step of obtaining the wind direction angle and the yaw error comprises the following steps:
acquiring a plurality of wind direction angles and a plurality of yaw errors in the preset time period;
the step of obtaining the equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring at the preset position according to the wind direction angle, the yaw error, the hub rotating speed, the first position parameter and the second position parameter comprises the following steps:
and obtaining the equivalent flexibility coefficient with the maximum numerical value corresponding to any one preset position in the preset time period according to the plurality of wind direction angles, the plurality of yaw errors, the plurality of first position parameters, the plurality of second position parameters and the plurality of hub rotating speeds.
Optionally, the method for monitoring fatigue damage of the foundation of the ring wind turbine further includes:
and outputting an annular diagram representing the equivalent flexibility coefficient of any preset position on the circumference of the basic ring according to the equivalent flexibility coefficient with the maximum value corresponding to any preset position in the preset time period.
Optionally, the method for monitoring fatigue damage of the foundation of the ring wind turbine further includes:
and alarming according to the result obtained by comparing the equivalent flexibility coefficient with a preset flexibility coefficient.
Optionally, the step of giving an alarm according to a result obtained by comparing the equivalent compliance coefficient with a preset compliance coefficient includes;
and when the value of the equivalent flexibility coefficient is larger than the value of the preset flexibility coefficient, alarming.
Optionally, the equivalent compliance coefficient δ is s/n, s is levelness, and n is hub rotation speed.
The embodiment of the invention also provides a basic ring type wind turbine foundation fatigue damage monitoring system, which comprises a basic ring, a detector and a controller, wherein the detector is communicated with the basic ring, the basic ring is arranged at the bottom of the wind turbine tower, the detector is arranged on the basic ring, and the detector is used for detecting the levelness of the basic ring;
the controller is used for acquiring the hub rotating speed representing the bottom load of the fan tower; and acquiring the levelness of the foundation ring; and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring according to the rotating speed of the hub and the levelness.
Optionally, the detector comprises a first detector and a second detector;
the first detector is used for detecting and obtaining a first position parameter representing the highest point position of the foundation ring, and the second detector is used for detecting and obtaining a second position parameter representing the lowest point position of the foundation ring;
the controller is used for obtaining the levelness of the basic ring according to the first position parameter and the second position parameter.
The method and the system for monitoring the fatigue damage of the foundation ring type wind turbine have the advantages that:
the method for monitoring the fatigue damage of the foundation ring type fan can feed back the damage degree of the foundation of the fan more accurately and improve the damage assessment effect through the equivalent flexibility coefficient obtained by the rotating speed and the levelness of the equivalent load hub.
By adopting the method, the effect of determining the fatigue damage of the foundation ring type fan can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a block flow diagram of a method for monitoring fatigue damage of a foundation ring wind turbine according to a first embodiment of the present invention;
FIG. 2 is a block flow diagram of a method for monitoring fatigue damage of a foundation ring wind turbine according to a second embodiment of the present invention;
FIG. 3 is a partial block flow diagram of a method for monitoring fatigue damage of a foundation ring wind turbine according to an embodiment of the present invention;
FIG. 4 is a block flow diagram of a method for monitoring fatigue damage of a foundation ring wind turbine according to a third embodiment of the present invention;
FIG. 5 is a flowchart of a method for monitoring fatigue damage of a foundation ring wind turbine according to a fourth embodiment of the present invention;
FIG. 6 is a ring diagram of the output of the basic ring wind turbine basic fatigue damage monitoring method provided by the embodiment of the present invention;
FIG. 7 is a block diagram of a basic ring wind turbine foundation fatigue damage monitoring system according to an embodiment of the present invention.
Icon: 100-a controller; 200-detector.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
In recent years, most of fan foundation health monitoring services are separated from fans, and the inclination condition of a fan foundation ring is reflected by sensor data alone. The monitored data result cannot feed back the concrete damage degree of the wind turbine foundation. The method and the system for monitoring the fatigue damage of the foundation ring type wind turbine provided by the embodiment can improve the problems.
The method for monitoring fatigue damage of foundation ring type wind turbine foundation provided by the embodiment is described in detail with reference to fig. 1 to 6.
Referring to fig. 1, an embodiment of the present invention provides a method for monitoring fatigue damage of a foundation of a ring wind turbine, including:
s1: acquiring the levelness of the foundation ring;
s2: acquiring the rotating speed of a hub representing the bottom load of a fan tower;
s4: and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring according to the rotating speed and the levelness of the hub.
The derivation process of the hub rotating speed representing the bottom load of the wind turbine tower is as follows:
wind-induced fatigue of wind turbine foundation concrete is likely to cause degradation of the shear strength of the interface between the steel foundation ring and the concrete surrounding the steel foundation ring, which is represented by irreversible surface shear stiffness K. The concrete breaks away from the crack, the crushing and the peripheral wearing cavity of the lower flange, so that a calculation model of an interface based on wind-induced fatigue damage can be established, namely:
K＝F(UH，ρ，H，Cf1 Cp……)/S
f is the wind turbine tower bottom load, S is the base ring levelness, UH is the average wind speed, ρ is the air density, H is the height from ground to hub center, Cf1 is the wind coefficient, Cp is the wind coefficient of the tower, A is the reference area of the blade, and D (z) is the tower diameter.
Inverting the above formula, and taking the flexibility coefficient delta 1 as a discrimination parameter, namely:
δ1＝S/F
however, in practical engineering, it is difficult to accurately determine the bottom load F of the wind turbine tower by directly using a formula.
Because the reason for the levelness S of the foundation ring is the bottom load F of the fan tower, the levelness S of the foundation ring has strong correlation with the bottom load F of the fan tower.
The inventor analyzes the levelness and the hub rotating speed through a Pearson linear correlation function and a Spireman grade correlation coefficient under 6 different working conditions of starting, stopping, yawing, a high-speed stable section, a rotating speed stable section, a low-speed stable section and the like of the prototype through a screened prototype, and obtains that the hub rotating speed n also has strong correlation with the levelness S of a basic ring, so that the hub rotating speed n can be regarded as the equivalent load of the bottom load F of the fan tower.
Therefore, the equivalent flexibility coefficient delta is obtained as s/n, wherein s is the levelness and n is the rotating speed of the hub.
Through obtaining wheel hub rotational speed and levelness, obtain equivalent compliance coefficient, equivalent compliance coefficient can feed back the impaired degree of fan basis more accurately. The monitoring effect is improved.
Referring to fig. 2, the method for monitoring fatigue damage of the foundation of the ring-type wind turbine further includes:
s3: acquiring a wind direction angle and a yaw error;
step S4 includes:
s41: and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the preset position in the circumferential direction of the foundation ring according to the wind direction angle, the yaw error, the rotating speed of the hub and the levelness.
And positioning to any preset position on the circumferential direction of the foundation ring through the real-time wind direction angle and the difference value of the yaw error. And when the positioning is carried out, the equivalent flexibility coefficient is obtained through the rotating speed and the levelness of the hub, so that the equivalent flexibility coefficient corresponding to the preset position in real time is obtained, and the positioning and damage assessment are completed. The monitored data result can be fed back to the specific damage position of the wind turbine foundation.
Referring to fig. 3, in the present embodiment, step S1 includes:
s11: acquiring a first position parameter representing the highest point position of the foundation ring and a second position parameter representing the lowest point position of the foundation ring;
s12: and obtaining the levelness of the basic ring according to the first position parameter and the second position parameter.
And measuring the difference value between the highest point and the lowest point by static leveling in the foundation ring to obtain the levelness of the foundation ring. And synchronously acquiring and analyzing real-time dynamic displacement signals of the highest point and the lowest point of the foundation ring and the rotating speed parameters of the hub of the fan unit. The cost is very low. And synchronizing signals are convenient to analyze. Comprehensively reflecting the wind-induced fatigue damage degree of the foundation concrete of the foundation ring type wind turbine.
Referring to fig. 4, in the present embodiment, step S41 includes:
s411: and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the preset position in the circumferential direction of the foundation ring according to the wind direction angle, the yaw error, the rotating speed of the hub, the first position parameter and the second position parameter.
And positioning to any preset position on the circumferential direction of the foundation ring through the real-time wind direction angle and the difference value of the yaw error. And when the positioning is carried out, the equivalent flexibility coefficient is obtained through the rotating speed of the hub, the first position parameter and the second position parameter, so that the equivalent flexibility coefficient corresponding to the preset position in real time is obtained, and the positioning and loss assessment are completed. The monitored data result can be fed back to the specific damage position of the wind turbine foundation.
Referring to fig. 5, in the present embodiment, step S2 includes:
s21: acquiring a plurality of hub rotating speeds in a preset time period;
step S11 includes:
s111: acquiring a plurality of first position parameters and a plurality of second position parameters within a preset time period;
step S3 includes:
s31: acquiring a plurality of wind direction angles and a plurality of yaw errors in a preset time period;
step S411 includes:
s4111: and obtaining the equivalent flexibility coefficient with the maximum numerical value corresponding to any preset position in a preset time period according to the plurality of wind direction angles, the plurality of yaw errors, the plurality of first position parameters, the plurality of second position parameters and the plurality of hub rotating speeds.
And correspondingly obtaining an equivalent flexibility coefficient of a preset position by the wind direction angle, the yaw error, the hub rotating speed, the first position parameter and the second position parameter at the same moment. And in a preset time period, a plurality of equivalent flexibility coefficients are correspondingly obtained at the same preset position, and the equivalent flexibility coefficient with the largest value is selected as the equivalent flexibility coefficient of the preset position. Any preset position in the circumferential direction of the basic ring correspondingly selects the equivalent flexibility coefficient with the largest value as the equivalent flexibility coefficient of the preset position, so that the difference of the equivalent flexibility coefficients between any preset positions in the circumferential direction of the basic ring can be reflected to the greatest extent. So that the damage can be located quickly.
And determining the damage position of the foundation and the maximum damage degree of each area by combining the wind direction angle, the yaw error, the rotating speed of the hub and the levelness of the foundation ring.
With reference to fig. 5, in this embodiment, the method for monitoring fatigue damage of the foundation ring wind turbine further includes:
s4112: and outputting an annular diagram representing the equivalent flexibility coefficient of any preset position in the circumferential direction of the basic ring according to the equivalent flexibility coefficient with the maximum value corresponding to any preset position in the preset time period.
Referring to fig. 6, a 360-degree ring is used for representing the circumferential position of the basic ring by 360 degrees, then equivalent flexibility coefficients of different preset positions are obtained in a preset time period, the equivalent flexibility coefficients of different preset positions are indicated at different preset positions on the 360-degree ring, and the indicated equivalent flexibility coefficient is the maximum value of the position in the preset time period.
According to the annular graph, the basic damage position and the maximum damage degree of each area can be rapidly identified.
In other embodiments, a real-time annular diagram can be output according to the real-time equivalent compliance coefficient of the preset position, and the basic damage condition can be observed in real time. And finally judging the equivalent flexibility coefficient annular graph with the maximum value according to the preset position in the preset time period.
Referring to fig. 1 again, in this embodiment, the method for monitoring fatigue damage of the foundation ring wind turbine further includes:
s5: and alarming according to the result obtained by comparing the equivalent flexibility coefficient with the preset flexibility coefficient. Practical early warning values can be provided, and an intelligent effect can be achieved.
Specifically, step S5 includes; and when the value of the equivalent flexibility coefficient is larger than the value of the preset flexibility coefficient, alarming. Specifically, when δ > [ δ ], an alarm is given. [ delta ] is the critical delta value.
When an alarm occurs, the annular diagram is combined, a database of a period of time can be obtained, and information such as the damage process of the foundation, the corresponding time and working condition when large damage occurs and the like is analyzed by the background, so that the foundation damage reason can be analyzed and the reinforcement scheme can be determined in the later period.
The method for monitoring the fatigue damage of the foundation ring type wind turbine provided by the embodiment at least has the following advantages:
by utilizing the rotating speed and the levelness of the hub, the damage can be accurately determined, and the basic damage degree can be timely and truly fed back.
Through wind direction angle, driftage error, wheel hub rotational speed, first position parameter and second position parameter, realized the location, the damage to fan basis damage.
And a database of a period of time is called, and information such as the basic damage process, the corresponding time and working condition when large damage occurs and the like is analyzed in the background, so that the damage reason can be traced.
And setting early warning parameters to realize the self-energy early warning of the wind turbine foundation.
Referring to fig. 7, an embodiment of the present invention further provides a system for monitoring fatigue damage of a foundation ring type wind turbine foundation, where the system for monitoring fatigue damage of a foundation ring type wind turbine foundation includes a foundation ring, a detector 200 and a controller 100, where the controller 100 is configured to execute the method for monitoring fatigue damage of a foundation ring type wind turbine foundation.
The base ring is arranged at the bottom of the wind turbine tower, the detector 200 is arranged on the base ring, and the detector 200 is used for detecting the levelness of the base ring;
the controller 100 is configured to obtain a hub rotation speed representing a bottom load of the wind turbine tower; and acquiring the levelness of the foundation ring; and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the basic ring according to the rotating speed and the levelness of the hub.
"communication" includes wired connections as well as wireless connections. The detector 200 and the controller 100 may be in signal transmission in a wired or wireless manner. After the detector 200 detects the levelness of the foundation ring, the levelness of the foundation ring is transmitted to the controller 100, the controller 100 acquires the levelness of the foundation ring, and the equivalent flexibility coefficient is obtained by combining the acquired rotating speed of the hub.
In this embodiment, the detector 200 includes a first detector and a second detector;
the first detector is used for detecting and obtaining a first position parameter representing the highest point position of the foundation ring, and the second detector is used for detecting and obtaining a second position parameter representing the lowest point position of the foundation ring;
the controller 100 is configured to obtain the levelness of the foundation ring according to the first position parameter and the second position parameter.
After the first detector detects the first position parameter, the first position parameter is transmitted to the controller, after the second detector detects the first position parameter, the second position parameter is transmitted to the controller, and after the controller receives 100 the first position parameter and the second position parameter, the equivalent flexibility coefficient is obtained by combining the obtained rotating speed of the hub.
The fatigue damage monitoring system for the foundation of the foundation ring type fan can improve the effect of determining the fatigue damage of the foundation ring type fan foundation by executing the method for monitoring the fatigue damage of the foundation ring type fan foundation.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A fatigue damage monitoring method for a foundation of a foundation ring type wind turbine is characterized by comprising the following steps:
acquiring the rotating speed of a hub representing the bottom load of a fan tower;
acquiring the levelness of the foundation ring;
and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the basic ring according to the rotating speed of the hub and the levelness.
2. The method for monitoring fatigue damage of foundation ring type wind turbine foundation of claim 1, wherein the step of obtaining the levelness of the foundation ring comprises:
acquiring a first position parameter representing the highest point position of the foundation ring and a second position parameter representing the lowest point position of the foundation ring;
and obtaining the levelness of the basic ring according to the first position parameter and the second position parameter.
3. The method for monitoring fatigue damage to a foundation of a ring wind turbine according to claim 2, wherein the method for monitoring fatigue damage to a foundation of a ring wind turbine further comprises:
acquiring a wind direction angle and a yaw error;
the step of obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring according to the rotating speed of the hub and the levelness comprises the following steps:
and obtaining the equivalent flexibility coefficient representing the fatigue damage degree of the preset position in the circumferential direction of the foundation ring according to the wind direction angle, the yaw error, the hub rotating speed, the first position parameter and the second position parameter.
4. The method for monitoring fatigue damage of foundation ring wind turbine foundation of claim 3, wherein said step of obtaining a hub speed characterizing a wind turbine tower bottom load comprises:
acquiring a plurality of hub rotating speeds in a preset time period;
the step of obtaining a first position parameter representing a highest point position of the foundation ring and a second position parameter representing a lowest point position of the foundation ring comprises:
acquiring a plurality of first position parameters and a plurality of second position parameters within the preset time period;
the step of obtaining the wind direction angle and the yaw error comprises the following steps:
acquiring a plurality of wind direction angles and a plurality of yaw errors in the preset time period;
the step of obtaining the equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring at the preset position according to the wind direction angle, the yaw error, the hub rotating speed, the first position parameter and the second position parameter comprises the following steps:
and obtaining the equivalent flexibility coefficient with the maximum numerical value corresponding to any one preset position in the preset time period according to the plurality of wind direction angles, the plurality of yaw errors, the plurality of first position parameters, the plurality of second position parameters and the plurality of hub rotating speeds.
5. The method for monitoring fatigue damage to a foundation of a ring wind turbine according to claim 4, wherein the method for monitoring fatigue damage to a foundation of a ring wind turbine further comprises:
and outputting an annular diagram representing the equivalent flexibility coefficient of any preset position on the circumference of the basic ring according to the equivalent flexibility coefficient with the maximum value corresponding to any preset position in the preset time period.
6. The method for monitoring fatigue damage of foundation ring wind turbine foundation of any one of claims 1 to 5, further comprising:
and alarming according to the result obtained by comparing the equivalent flexibility coefficient with a preset flexibility coefficient.
7. The method for monitoring the fatigue damage of the foundation ring type fan foundation according to claim 6, wherein the step of alarming according to the result obtained by comparing the equivalent compliance coefficient with a preset compliance coefficient comprises;
and when the value of the equivalent flexibility coefficient is larger than the value of the preset flexibility coefficient, alarming.
8. The method for monitoring the fatigue damage of the foundation ring type fan foundation according to any one of claims 1 to 5, wherein the equivalent compliance coefficient δ is s/n, s is levelness, and n is the rotation speed of the hub.
9. A fatigue damage monitoring system for a foundation of a ring-type wind turbine foundation is characterized by comprising a foundation ring, a detector (200) and a controller (100), wherein the detector (200) is communicated with the controller, the foundation ring is used for being arranged at the bottom of a wind turbine tower, the detector (200) is arranged on the foundation ring, and the detector (200) is used for detecting the levelness of the foundation ring;
the controller (100) is used for acquiring the rotating speed of a hub representing the bottom load of the fan tower; and acquiring the levelness of the foundation ring; and obtaining an equivalent flexibility coefficient representing the fatigue damage degree of the foundation ring according to the rotating speed of the hub and the levelness.
10. The foundation ring wind turbine foundation fatigue damage monitoring system of claim 9, wherein the detector (200) comprises a first detector (200) and a second detector (200);
the first detector (200) is used for detecting and obtaining a first position parameter which is used for representing the highest point position of the foundation ring, and the second detector (200) is used for detecting and obtaining a second position parameter which is used for representing the lowest point position of the foundation ring;
the controller (100) is used for obtaining the levelness of the basic ring according to the first position parameter and the second position parameter.
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| CN118241708A (en) * | 2024-05-29 | 2024-06-25 | 湖南科技大学 | Land wind turbine foundation damage degree monitoring, early warning and assessment method |
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