CN115371925A - Wind power blade double-point synchronous excitation method and device based on ground seesaw structure support - Google Patents
Wind power blade double-point synchronous excitation method and device based on ground seesaw structure support Download PDFInfo
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- CN115371925A CN115371925A CN202211010181.7A CN202211010181A CN115371925A CN 115371925 A CN115371925 A CN 115371925A CN 202211010181 A CN202211010181 A CN 202211010181A CN 115371925 A CN115371925 A CN 115371925A
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- 230000005284 excitation Effects 0.000 title claims abstract description 17
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 230000007306 turnover Effects 0.000 claims abstract description 8
- 238000011068 loading method Methods 0.000 claims description 42
- 238000009661 fatigue test Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 19
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a wind power blade double-point synchronous excitation method and device based on ground seesaw structure support. When the vibration exciter works, the two vibration exciter speed reducers work under the driving of a motor, the output shafts of the speed reducers enable the swing arms to do rotary motion to generate exciting force, the magnetic grid motion positions detected by the magnetic grid sensors in the vibration exciters I and II are transmitted to control software, the rotating speeds of the two vibration exciters are adjusted to keep the phase difference at 180 degrees, so that the vibration exciters II and the swing arms of the vibration exciters I are controlled to alternately rotate up and down to operate, the rocker turnover mechanism drives the connecting rods to stably move up and down, the blades are forced to vibrate in the direction of the mounting surfaces of the vibration exciters, and finally resonance is achieved. The whole set of excitation device is separated from the blade, so that mechanical coupling errors caused by the device are avoided, blade tension and reverse supporting force can be provided, and the fatigue life testing and detecting efficiency is improved.
Description
The invention belongs to the technical field of wind power blade testing, and relates to a wind power blade fatigue testing loading device with excellent comprehensive performance.
Background
The wind power blade is used as a main part of a wind driven generator for receiving wind energy, the design life of the wind power blade is as long as 20 years, research shows that fatigue damage is the main failure mode of the blade due to the influence of alternating load for a long time, and fatigue test is carried out to verify the performance and the service life of the blade to be the most effective mode. At present, a vibration exciter is generally placed on a blade in a blade fatigue test, and the blade is driven by the vibration exciter to realize resonance, so that the blade continuously vibrates up and down, and the fatigue life of the blade is tested. With the development of wind power technology, the size of the blade is also getting bigger and bigger, and because the blade fatigue test usually requires that the bending moment of the blade meets the test standard, in order to make the vibration bending moment of the wind power blade reach the target value, measures such as increasing the power of a vibration exciter, increasing a mass block, and strengthening the strength of a clamp are usually adopted. These measures cause the weight of the vibration exciter to be too heavy, so that the additional mass of the section where the vibration exciter is located is too large, and the deviation of the local bending moment from the target value is too large. As the weight of the vibration exciter is added to the weight of the tested wind power blade, the resonance frequency of the whole testing system is reduced, and the testing period is prolonged.
Therefore, how to design a novel wind power blade fatigue test loading device for eliminate vibration exciter and counter weight when carrying out blade fatigue life and detect and influence the blade, the technical problem that technical staff in the field need to solve urgently.
Disclosure of Invention
Aiming at the defects of the existing testing technology of the fatigue loading test of the wind power blade, the invention provides a wind power blade double-point synchronous excitation method and device based on the ground seesaw structure support, which can effectively reduce the gravity distance generated by a vibration exciter and a counter weight to the blade, effectively improve the resonance frequency of a testing system, and efficiently exert the loading efficiency of the vibration exciter, thereby better measuring the fatigue performance of the blade and shortening the testing period.
The invention is realized through the following technical scheme, and discloses a method and a device for fatigue loading of a wind power blade, wherein the structure of the loading device is shown in figure 1. In the figure: 1 blade, 2 vibration exciter I, 3 wane tilting mechanism, 4 bases, 5 vibration exciter II, 6 connecting rods, 7 motors, 8 speed reducers, 9 magnetic grids, 10 magnetic grid sensors, 11 sensor mounting bases, 12 vibration exciter mounting bases, 13 eccentric mass blocks and 14 swing arms.
The components of the structure of fig. 1 are described.
The loading device is connected with the blades, provides power through the vibration exciter and completes a certain fatigue test and mainly comprises a steel structure tool and a vibration exciting module.
The steel structure tool mainly comprises a base, a connecting rod, a rotating shaft, a wane turnover mechanism and a vibration exciter base.
The base of the fatigue loading device is fixed on the ground through the high-strength bolt, the upper end of the base is provided with the rotating shaft which is used for connecting the base with the wane turnover mechanism, the torque generated by the vibration exciter can be converted into pulling fatigue of the blade, and the two sides of the high-hardness alloy rotating shaft are provided with the limiting baffle plates, so that the safety of the fatigue loading device is ensured.
The vibration exciter base is connected with the wane tilting mechanism, and the vibration exciter can integrally adjust the required arm of force as required, so that the fatigue loading of different blade loads is realized.
The two vibration exciters comprise motors, speed reducers, vibration exciter bases, swing arms and eccentric mass blocks, the vibration exciters further comprise magnetic grids, sensor mounting bases and magnetic grid sensors, the magnetic grid sensors in the vibration exciters detect the movement positions of the magnetic grids and transmit the movement positions to control software, and the rotation speed is adjusted to enable the phase difference of the swing arms to be kept at 180 degrees all the time.
The wind power blade passes through flange and threaded connection in loading device's connecting rod, and whole wane tilting mechanism is long 10 meters, and upper and lower maximum stroke angle is 60 degrees, and upper and lower maximum stroke distance is 5 meters, and this structure can satisfy hectometer level wind power blade's fatigue test.
The whole loading device can provide a loading force of 0-1000KN, and the design structure of the loading device meets the requirements of safety, applicability and durability.
A loading device for a wind power blade fatigue test comprises the following loading method:
(1) The balance weight of the vibration exciter is adjusted according to the overall size of the wind power blade, so that the required torque under different working conditions is adapted;
(2) Mounting the test blade on a test device through a connecting rod by using a high-strength bolt and glass fiber, wherein the test blade is positioned right above a loading device;
(3) And after all installation works are checked, controlling the motor to operate through the control of the computer monitoring interface, wherein the motor is fastened in the vibration exciter base through a threaded hole, the speed reducer is fastened in the vibration exciter base through a threaded hole, and the input shaft of the speed reducer is concentric with the output shaft of the motor and is connected with the output shaft of the motor through a key slot. The swing arm is matched with the output shaft of the speed reducer through a key groove, the swing arm and the speed reducer are tightly and firmly fixed on the output shaft of the speed reducer through a threaded hole, the through hole of the swing arm is connected with the eccentric mass block, so that different loads can be adapted by adjusting the eccentric mass block, and the loading device drives the blades to reciprocate up and down to finally realize resonance;
(4) The loading device and the blade continuously resonate, the alternating cycle borne by the blade is continuously increased, and finally the yield limit is reached until the fracture is finished.
Based on the designed loading mode and device, the fatigue bearing capacity and the damage condition of the tested blade are obtained, the analysis result can be used as the evaluation index of the blade performance, and a theoretical basis is provided for the subsequent blade material fatigue strength enhancement design.
Compared with the prior art, the invention has the beneficial effects that:
(1) The loading device is separated from the blade body, so that the additional weight of the excitation equipment to the blade is eliminated, the resonance frequency of the whole test system tends to an ideal state, the test result is compensated well, the test period is shortened, the test result is reliable, and the overall benefit is increased;
(2) The yield limit of the blade reaching the fatigue failure can be accurately obtained, and the performance of the blade is favorably improved;
(3) The traditional fatigue testing device only has unidirectional tension to the blade, the bending stress of the other side mostly depends on the resilience of the blade, the excitation device and the blade are difficult to resonate at the same frequency, the device can provide downward tension of the blade and upward supporting force, and the loading device can resonate at the same frequency with the blade.
Drawings
FIG. 1 is a schematic view of the overall configuration of the fatigue loading apparatus of the present invention;
FIG. 2 is a detailed structural schematic diagram of the fatigue loading device of the present invention;
FIG. 3 is a flowchart of a fatigue loading method.
The reference numbers:
the vibration exciter comprises a blade 1, a vibration exciter I2, a seesaw turnover mechanism 3, a base 4, a vibration exciter II 5, a connecting rod 6, a motor 7, a speed reducer 8, a magnetic grid 9, a magnetic grid sensor 10, a sensor mounting base 11, a vibration exciter mounting base 12, an eccentric mass block 13 and a swing arm 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to specific embodiments.
As shown in fig. 1, in the loading device, 1 is a blade, 2 is a vibration exciter i, 3 is a wane turnover mechanism, 4 is a base, 5 is a vibration exciter ii, 6 is a connecting rod, 7 is a motor, 8 is a speed reducer, 9 is a magnetic grid, 10 is a magnetic grid sensor, 11 is a sensor mounting base, 12 is a vibration exciter mounting base, 13 is an eccentric mass block, and 14 is a swing arm. Base 4 is connected with wind-powered electricity generation blade 1, and wind-powered electricity generation blade 1 is connected with 6 connecting rods, and vibration exciter I2 contains motor 7, speed reducer 8, vibration exciter base 12, swing arm 14, eccentric quality piece 13, magnetic grid 9, sensor mount pad 11, magnetic grid sensor 10, and vibration exciter II 5 contains motor 7, speed reducer 8, vibration exciter base 12, swing arm 14, eccentric quality piece 13, vibration exciter base 12 is connected with speed reducer 8, and speed reducer 8 is connected with motor 7 and is connected with swing arm 14, sensor mount pad 11, and swing arm 14 is connected with eccentric quality piece 13, and sensor mount pad 11 is connected with magnetic grid sensor 10.
The specific implementation of the loading method and the loading device for the fatigue loading of the wind power blade is shown in fig. 2, and for the developed wind power blade, the alternating force and the elapsed time of the blade when the yield limit is reached can be accurately obtained by using the loading method and the loading device, and meanwhile, the loading method and the loading device can also be used as a basis for optimizing the structure of the blade.
The specific implementation steps of the blade fatigue loading are as follows:
(1) Connecting the blade with a connecting rod according to a wind power blade test sample piece provided by a certain unit, and measuring the space required by a loading device;
(2) Controlling a motion controller and a frequency converter by adopting an upper computer monitoring interface through Ethernet communication, and further adjusting the frequency of a vibration exciter according to the blade waving amplitude and frequency;
(3) Connecting a test blade with a fatigue loading device, wherein the blade is positioned above loading equipment;
(4) Controlling the rotating speed of the motor to further control the frequency of the vibration exciter, enabling the blade to start waving from a standstill state, finally forming resonance with the loading device, collecting data recorded by the loaded pressure sensor and the loaded displacement sensor, and controlling the motor to be synchronous by collecting data of the grating transmitter;
(5) And the alternating stress borne by the blade is circularly and gradually increased until the yield limit is reached, the blade is broken until the end, and the bearing capacity of the blade reaching the maximum yield limit is obtained.
Based on the designed loading method and device, a blade fatigue loading test is carried out to measure the fatigue limit of the blade, the analysis result can be used as an evaluation index of the performance of the blade, a theoretical basis is provided for the subsequent strengthening design of the blade, the service life of the blade is prolonged, and the probability of catastrophic collapse of the wind power blade caused by fatigue damage of the blade is reduced.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a wind-powered electricity generation blade two-point synchronization excitation method and device based on ground "seesaw" structural support, its device includes base, wind-powered electricity generation blade, wane tilting mechanism, connecting rod, vibration exciter I, vibration exciter II, converter, its characterized in that:
wane tilting mechanism has the flange mounting hole, vibration exciter I, II all contain motor, speed reducer, vibration exciter base, swing arm, eccentric mass piece, magnetic grid, sensor mount pad, magnetic grid sensor, the connecting rod has the through-hole to pass through bearing connection wane tilting mechanism, the motor has mounting hole and keyway, the speed reducer has mounting hole and screw hole, the swing arm has the through-hole, eccentric quality has the through-hole soon, the magnetic grid has the fixed orifices, the sensor mount pad has the fixed orifices, the magnetic grid sensor has the mounting hole, fatigue test device passes through the connecting rod and links to each other with the blade, wholly places in blade below and blade separation.
2. The wind power blade double-point synchronous excitation device based on the ground seesaw structural support as claimed in claim 1, wherein the base is connected with the seesaw turnover mechanism, and is connected with the connecting rod through the bearing mounting hole to connect the blade, unlike the traditional wind power blade double-point synchronous excitation device directly connected to the blade itself.
3. The wind power blade double-point synchronous excitation device based on the ground seesaw structural support according to claim 1, wherein the vibration exciter base is fastened on the seesaw turnover mechanism through threads, the motor is fastened in the vibration exciter base through a threaded hole, the speed reducer is fastened in the vibration exciter base through a threaded hole, and the speed reducer input shaft is concentric with the motor output shaft and is connected through a key slot.
4. The wind power blade double-point synchronous excitation device based on the ground seesaw structure support is characterized in that the swing arm is matched with a speed reducer output shaft through a key groove, the swing arm and the speed reducer are tightly and firmly fixed on the speed reducer output shaft through threaded holes, the swing arm through hole is connected with the eccentric mass block, the eccentric mass block can be adjusted according to the load size, and the magnetic grid is tightly and firmly fixed in the speed reducer output shaft through a mounting hole, so that the synchronous motion of the magnetic grid and the speed reducer is realized.
5. The wind power blade double-point synchronous excitation device based on the ground seesaw structure support is characterized in that the sensor mounting seat is welded on the speed reducer and is arranged in the vibration exciters I and II, and the magnetic grid sensor is mounted on the sensor mounting seat through a threaded hole, so that the function of recording the position of the magnetic grid by the magnetic grid sensor is realized.
6. The wind power blade double-point synchronous excitation device based on the ground seesaw structure support is characterized in that in the loading method, the vibration exciter and the blade are installed separately, and damage of the vibration exciter to the blade due to self weight and torque generated in the operation process is reduced.
7. The wind power blade double-point synchronous vibration excitation device based on the ground seesaw structure support according to claim 1, the traditional fatigue testing device only has one-way tension on the blade, the bending stress on the other side is mostly dependent on the resilience of the blade, the vibration excitation device and the blade are difficult to resonate at the same frequency, the device not only can provide downward tension for the blade, but also can provide upward supporting force, and the loading device can resonate at the same frequency as the blade.
8. The wind power blade double-point synchronous excitation device based on the ground seesaw structure support as claimed in claim 1, wherein the phase difference between the two motors is kept at 180 degrees, and further the motion tracks of the swing arms on the two motors are 180 degrees apart, so that the seesaw turnover mechanism can do constant reciprocating motion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211010181.7A CN115371925A (en) | 2022-08-23 | 2022-08-23 | Wind power blade double-point synchronous excitation method and device based on ground seesaw structure support |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211010181.7A CN115371925A (en) | 2022-08-23 | 2022-08-23 | Wind power blade double-point synchronous excitation method and device based on ground seesaw structure support |
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| Publication Number | Publication Date |
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| CN115371925A true CN115371925A (en) | 2022-11-22 |
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| CN202211010181.7A Pending CN115371925A (en) | 2022-08-23 | 2022-08-23 | Wind power blade double-point synchronous excitation method and device based on ground seesaw structure support |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4412704A1 (en) * | 1994-04-13 | 1995-10-19 | Erich Gerards | Test apparatus for generating oscillations over range of frequency |
| JP2000227392A (en) * | 1999-02-05 | 2000-08-15 | Saginomiya Seisakusho Inc | Torsion/bending combined load-testing machine |
| JP2001305010A (en) * | 2000-04-25 | 2001-10-31 | Kyoei Technica Kk | Vibration stroke setting mechanism of inspection device for buffer |
| CN1687740A (en) * | 2005-04-22 | 2005-10-26 | 中国矿业大学 | Wear test method of twisting jiggle of generating micro iamplitude of vibration, and testing machine |
| CN101017129A (en) * | 2006-11-17 | 2007-08-15 | 中国矿业大学 | Multifunctional micro friction wear testing machine |
| CN101144764A (en) * | 2007-09-11 | 2008-03-19 | 中北大学 | Dynamic and static mechanics integrated test platform |
| CN103512732A (en) * | 2012-06-15 | 2014-01-15 | 上海同韵环保能源科技有限公司 | Wind turbine generator system wind turbine blade fatigue loading test device and method |
| CN104515662A (en) * | 2013-10-08 | 2015-04-15 | 郑州大学 | Amplitude continuously adjustable mechanical shaker |
| CN111645877A (en) * | 2020-05-07 | 2020-09-11 | 南京华航翼飞行器技术有限公司 | Seesaw type rotor wing fatigue test device and working method thereof |
-
2022
- 2022-08-23 CN CN202211010181.7A patent/CN115371925A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4412704A1 (en) * | 1994-04-13 | 1995-10-19 | Erich Gerards | Test apparatus for generating oscillations over range of frequency |
| JP2000227392A (en) * | 1999-02-05 | 2000-08-15 | Saginomiya Seisakusho Inc | Torsion/bending combined load-testing machine |
| JP2001305010A (en) * | 2000-04-25 | 2001-10-31 | Kyoei Technica Kk | Vibration stroke setting mechanism of inspection device for buffer |
| CN1687740A (en) * | 2005-04-22 | 2005-10-26 | 中国矿业大学 | Wear test method of twisting jiggle of generating micro iamplitude of vibration, and testing machine |
| CN101017129A (en) * | 2006-11-17 | 2007-08-15 | 中国矿业大学 | Multifunctional micro friction wear testing machine |
| CN101144764A (en) * | 2007-09-11 | 2008-03-19 | 中北大学 | Dynamic and static mechanics integrated test platform |
| CN103512732A (en) * | 2012-06-15 | 2014-01-15 | 上海同韵环保能源科技有限公司 | Wind turbine generator system wind turbine blade fatigue loading test device and method |
| CN104515662A (en) * | 2013-10-08 | 2015-04-15 | 郑州大学 | Amplitude continuously adjustable mechanical shaker |
| CN111645877A (en) * | 2020-05-07 | 2020-09-11 | 南京华航翼飞行器技术有限公司 | Seesaw type rotor wing fatigue test device and working method thereof |
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