CN113758700A - Wind power blade fatigue test system - Google Patents
Wind power blade fatigue test system Download PDFInfo
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- CN113758700A CN113758700A CN202111112910.5A CN202111112910A CN113758700A CN 113758700 A CN113758700 A CN 113758700A CN 202111112910 A CN202111112910 A CN 202111112910A CN 113758700 A CN113758700 A CN 113758700A
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- traction rope
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention discloses a wind power blade fatigue test system, which comprises: the device comprises a driving system, a strain monitoring system and a controller. The driving system comprises a clamp, a servo motor and a traction rope roller device. The clamp is sleeved on the blade, the servo motor drives the traction rope roller device to rotate, and a traction rope in the traction rope roller device is tied on the clamp. The strain monitoring system comprises a plurality of groups of strain gauges and a strain tester, wherein the strain gauges are attached to the blades, and the strain tester is used for acquiring measurement data of the strain gauges. The controller is in communication connection with the strain tester and controls the motion state of the servo motor. By utilizing the system, the motion states of the rotation quantity, the rotation speed and the like of the servo motor can be adjusted in real time according to the strain data detected by the strain monitoring system, so that the strain value required by the test meets the set requirement, and the efficiency and the accuracy of the test are improved.
Description
Technical Field
The invention relates to a fatigue testing system for a wind power blade.
Background
With the trend of high power of the wind generating set, the large-scale development of the wind power blade is driven from the internal aspect. The fatigue test is a key link for verifying the large blade type. During the fatigue test, the data of strain, displacement and the like of each section position of the blade need to be monitored in real time, whether the fatigue test bending moment of the blade reaches a target bending moment value or not is calculated through the strain data fed back in real time, and when the deviation between the test bending moment value and the target bending moment is overlarge, the target bending moment is reached by adjusting the vibration frequency or the amplitude of the excitation equipment. At present, the frequency or amplitude of vibration exciter control software is manually adjusted according to the comparison between real-time strain and theoretical strain, and the debugging process is long in period and low in accuracy. Since the fatigue test is usually a 24-hour uninterrupted test, it is necessary to ensure that a tester must monitor and debug the frequency and amplitude in real time before monitoring the computer.
The existing blade resonance fatigue testing system generally adopts the following methods: 1. the rotary centrifugal type has the following disadvantages: the amplitude of the blade can hardly be adjusted in the loading process, and the eccentric mass block reduces the natural frequency of the blade testing system; the reciprocating inertia type has the following disadvantages: the inertia additional force increases the extra power of the motor, and the reciprocating mass block reduces the natural frequency of the blade testing system; hydraulic, its disadvantages are: the heating is serious, the fatigue life of the components is short, and the cost is high.
Disclosure of Invention
The invention aims to overcome the defects that a wind power blade fatigue testing system in the prior art is long in debugging period and testing equipment and a method are long, and provides a wind power blade fatigue testing system capable of solving the problems.
The invention solves the technical problems through the following technical scheme:
a wind turbine blade fatigue test system is characterized by comprising:
the driving system comprises a clamp, a servo motor and a traction rope roller device, the clamp is sleeved on the blade, the servo motor drives the traction rope roller device to rotate, and a traction rope in the traction rope roller device is tied on the clamp;
the strain monitoring system comprises a plurality of groups of strain gauges and a strain tester, wherein the strain gauges are attached to the blades and used for acquiring measurement data of the strain gauges;
and the controller is in communication connection with the strain tester and controls the motion state of the servo motor.
Preferably, the wind power blade fatigue test system further comprises a distance meter for detecting the amplitude of the blade, and the distance meter is in communication connection with the controller.
Preferably, the wind power blade fatigue test system further comprises a sensor acquisition system, wherein the sensor acquisition system comprises a temperature and humidity sensor and a wind meter, and the temperature and humidity sensor and the wind meter are in communication connection with the controller.
Preferably, the driving system further comprises a fixed pulley, the servo motor, the traction rope roller device and the fixed pulley are fixed on a workbench, and the traction rope passes through the fixed pulley and is connected to the clamp.
Preferably, each group of the driving system comprises two servo motors and two traction rope roller devices, a row of connecting holes are formed below the clamp, and the two traction ropes are tied to the connecting holes on two sides below the clamp respectively.
Preferably, the wind power blade fatigue test system comprises a plurality of groups of driving systems, and the plurality of clamps are respectively sleeved at different positions of the blade.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: by utilizing the system, the motion states of the rotation quantity, the rotation speed and the like of the servo motor can be adjusted in real time according to the strain data detected by the strain monitoring system, so that the strain value required by the test meets the set requirement, and the efficiency and the accuracy of the test are improved.
Drawings
FIG. 1 is a schematic structural diagram of a wind turbine blade fatigue testing system connected with a blade according to a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of a wind turbine blade fatigue testing system in a preferred embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a driving system in a preferred embodiment of the present invention.
Description of reference numerals:
Traction rope drum device 130
Hauling rope 131
Fixed pulley 140
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Fig. 1 and 2 show a wind turbine blade fatigue testing system comprising: a drive system 100, a strain monitoring system 200, and a controller 300. The drive system 100 includes a clamp 110, a servomotor 120, and a pull-cord reel apparatus 130. The clamp 110 is sleeved on the blade 10, the servo motor 120 drives the pull rope roller device 130 to rotate, and the pull rope 131 in the pull rope roller device 130 is tied on the clamp 110. The strain monitoring system 200 includes a plurality of sets of strain gages 210 and strain gauges (not shown) with the strain gages 210 attached to the blade 10 and the strain gauges being used to obtain measurement data for the strain gages 210. The controller 300 is in communication with the strain gauge and controls the motion state of the servo motor 120.
When the fatigue test of the wind power blade is performed, the strain gauge 210 is firstly attached to the positions of the maximum chord length section, the transition of the blade root section from a circle to an airfoil-shaped region, the lap transition region of different structural materials or the dangerous section during the structural design, the PS surface main beam, the SS surface main beam, the PS surface rear edge, the SS surface rear edge, the blade front edge and the like. The clamp 110 is fitted over the blade 10 and connected to the servo motor 120 and the pull-cord reel device 130. The clamp 110 is mainly used to protect the blade 10 from damage caused by the drag rope 131 directly tied to the blade 10. The controller 300 sets the initial rotation speed, rotation amount, and forward and reverse rotation period of the servo motor 120, starts the servo motor 120, and pulls the blade 10 to vibrate up and down through the pulling rope 131. The strain amount of the wind turbine blade 10 at the initial set value is detected by the strain tester and data is transmitted to the controller 300, the controller 300 compares the actual strain value with the target strain value, and adjusts the rotating speed, the rotating amount and the forward and reverse rotating period of the servo motor 120. Through repeated detection and adjustment, the deviation between the actual strain value and the target strain value of the blade 10 is finally smaller than 2%, and the blade can be considered to be adjusted to the position at the moment, so that a continuous dynamic test can be performed. The system can realize automatic adjustment of vibration strain, shorten debugging time and stabilize a strain curve. And the vibration times can be automatically recorded, and can be accumulated and recorded when the machine is stopped and restarted.
In order to ensure the accuracy and safety of the test, the wind turbine blade fatigue testing system further comprises a distance meter 400 for detecting the amplitude of the blade 10, and the distance meter 400 is in communication connection with the controller 300. When the amplitude of the blade 10 is less than or exceeds the predetermined value, the controller 300 will alarm and take corresponding emergency measures.
In addition, the fatigue test is closely related to factors such as temperature, humidity and wind speed, and in the scheme, the wind power blade fatigue test system further comprises a sensor acquisition system 500, the sensor acquisition system 500 comprises a temperature and humidity sensor (not shown in the figure) and a wind meter (not shown in the figure), and the temperature and humidity sensor and the wind meter are in communication connection with the controller 300. The accuracy of the dynamic test can be further improved by increasing data such as temperature, humidity, wind speed and the like.
In this embodiment, the driving system 100 further includes a fixed pulley 140, the servo motor 120, the pull rope roller device 130 and the fixed pulley 140 are fixed on the worktable, and the pull rope 131 passes through the fixed pulley 140 and is connected to the clamp 110. The fixed pulley 140 can be used for driving the clamp 110 at any position without changing the positions of the servo motor 120 and the traction rope drum device 130, so that the universality of the system is improved, and the labor intensity of the test is reduced.
As shown in fig. 3, each set of driving system 100 includes two servo motors 120 and two pull rope drum devices 130, a row of connection holes 111 is formed below the clamp 110, and two pull ropes 131 are tied to the connection holes 111 at both sides of the lower portion of the clamp 110. The two hauling ropes 131 are used for driving, so that the hauling force can be increased on one hand, and the blade 10 can be prevented from being twisted due to the single hauling rope 131 on the other hand.
In order to better simulate the motion state of the blade 10 under the real working condition, the wind turbine blade fatigue testing system includes a plurality of sets of driving systems 100, and a plurality of clamps 110 are respectively sleeved at different positions of the blade 10.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (6)
1. A wind turbine blade fatigue testing system, characterized in that it includes:
the driving system comprises a clamp, a servo motor and a traction rope roller device, the clamp is sleeved on the blade, the servo motor drives the traction rope roller device to rotate, and a traction rope in the traction rope roller device is tied on the clamp;
the strain monitoring system comprises a plurality of groups of strain gauges and a strain tester, wherein the strain gauges are attached to the blades and used for acquiring measurement data of the strain gauges;
and the controller is in communication connection with the strain tester and controls the motion state of the servo motor.
2. The wind blade fatigue testing system of claim 1, further comprising a rangefinder for detecting an amplitude of the blade, the rangefinder communicatively coupled to the controller.
3. The wind turbine blade fatigue testing system of claim 2, further comprising a sensor acquisition system, wherein the sensor acquisition system comprises a temperature and humidity sensor and a wind meter, and the temperature and humidity sensor and the wind meter are in communication connection with the controller.
4. The wind turbine blade fatigue testing system of claim 3, wherein the driving system further comprises a fixed pulley, the servo motor, the pull rope roller device and the fixed pulley are fixed on a worktable, and the pull rope passes through the fixed pulley and is connected to the clamp.
5. The wind turbine blade fatigue testing system according to claim 4, wherein each set of the driving system comprises two servo motors and two traction rope roller devices, a row of connecting holes are formed below the clamp, and two traction ropes are tied to the connecting holes on two sides below the clamp respectively.
6. The wind blade fatigue testing system of claim 5, wherein the wind blade fatigue testing system comprises a plurality of sets of drive systems, and a plurality of the clamps are respectively sleeved at different positions of the blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111112910.5A CN113758700A (en) | 2021-09-23 | 2021-09-23 | Wind power blade fatigue test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111112910.5A CN113758700A (en) | 2021-09-23 | 2021-09-23 | Wind power blade fatigue test system |
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| Publication Number | Publication Date |
|---|---|
| CN113758700A true CN113758700A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111112910.5A Pending CN113758700A (en) | 2021-09-23 | 2021-09-23 | Wind power blade fatigue test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705473A (en) * | 2022-06-07 | 2022-07-05 | 中国飞机强度研究所 | Airplane vibration superposition fatigue strength testing system and low-rigidity load applying method thereof |
-
2021
- 2021-09-23 CN CN202111112910.5A patent/CN113758700A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705473A (en) * | 2022-06-07 | 2022-07-05 | 中国飞机强度研究所 | Airplane vibration superposition fatigue strength testing system and low-rigidity load applying method thereof |
| CN114705473B (en) * | 2022-06-07 | 2022-08-26 | 中国飞机强度研究所 | Airplane vibration superposition fatigue strength testing system and low-rigidity load applying method thereof |
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