CN110231162A - The method for testing fatigue of wind electricity blade - Google Patents
The method for testing fatigue of wind electricity blade Download PDFInfo
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- CN110231162A CN110231162A CN201910663543.4A CN201910663543A CN110231162A CN 110231162 A CN110231162 A CN 110231162A CN 201910663543 A CN201910663543 A CN 201910663543A CN 110231162 A CN110231162 A CN 110231162A
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Abstract
The invention discloses a kind of method for testing fatigue of wind electricity blade, comprising the following steps: the direction that wind electricity blade is upward with its rear, leading edge is downward and chord length is perpendicular to the ground is mounted on test platform；By multiple vibration excitors by the different counterweight point positions being mounted in the way of waving direction horizontal addload on wind electricity blade；The parameter for adjusting multiple vibration excitors makes multiple vibration excitor collaboration loads, starts multiple vibration excitors, keeps vibration amplitude stable and reach regulation target call.The present invention is by being changed to horizontal addload for traditional Vertical loading, and multi-point cooperative load is carried out by multiple vibration excitors, the load efficiency of single vibration excitor can not only be promoted, it is also avoided that when carrying out wind turbine blade testing fatigue and loads hypodynamic situation, meet the testing fatigue demand of wind turbine blade.The test method is more in line with the setting of fatigue design load than conventional test methodologies, is more nearly the temporal-spatial evolution operating condition of Cumulative Fatigue Damage in wind electricity blade operational process.
Description
Technical field
The present invention relates to technical field of wind power generation, in particular to a kind of method for testing fatigue of wind electricity blade.
Background technique
The direction of motion of the blade (hereinafter referred to as " wind electricity blade ") of wind-driven generator, which is divided into, waves direction and edgewise direction,
And waving direction is its main movement direction.The design feature of wind electricity blade determines that it has direction to the ability to bear of load
Property, wind electricity blade is to wave the moment of flexure that direction can bear bigger than what edgewise direction was born.When carrying out testing fatigue, wave
The exciting force demand for waving direction is higher than edgewise direction, and vibration excitor is needed to issue stronger exciting force.Existing testing fatigue mode
Predominantly wave direction using Vertical loading in wind electricity blade, i.e., the face PS (windward side) of wind electricity blade upward, the face SS it is (leeward
Face) downward, chord length direction it is parallel to the ground, the loading force of vibration excitor and the gravity of vibration excitor are parallel to each other, such as Fig. 2 and Fig. 3 institute
Show.
As wind electricity blade develops toward enlarged direction, the testing fatigue technological development of wind turbine blade becomes crucial bottle
Neck.Vibration excitor highlights the hypodynamic problem of exciting when encountering wind turbine blade testing fatigue at present.In the prior art,
In order to make the vibration moment of flexure of wind electricity blade reach target value, generally requires to take the power for increasing vibration excitor, increase mass block, add
The measures such as strong fixture intensity.These measures cause that vibration excitor own wt is overweight, so that the additional matter in section where vibration excitor
It measures excessive, will cause local bending moment and target value deviation is excessive.Since the weight of vibration excitor belongs to for test wind electricity blade
In impost, decline the resonant frequency of entire test macro, the exciting force of vibration excitor and resonant frequency it is square directly proportional,
Resonant frequency decline, exciting force are just had a greatly reduced quality.The decline of resonant frequency also results in the extension of test period, identical reaching
When target circulation number, test period is inversely proportional with resonant frequency.The test period of general more than 80 meters of blades is 100 days, such as
Fruit resonant frequency decline 10%, wind electricity blade test period will extend 10 days.
In conclusion, in order to improve the ability of vibration excitor, increasing vibration excitor in traditional wind electricity blade testing fatigue
Weight cause the resonant frequency of test macro to make the gravitational moment for bearing excessive vibration excitor and counterweight on wind electricity blade
Decline greatly reduces the load efficiency of vibration excitor (load efficiency is the ratio between exciting force and axial force of vibration excitor of output).
Summary of the invention
The technical problem to be solved by the present invention is in order to overcome the above-mentioned defects in the prior art, provide a kind of wind electricity blade
Method for testing fatigue.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of method for testing fatigue of wind electricity blade, it is characterized in that, comprising the following steps:
S1, the direction that wind electricity blade is upward with its rear, leading edge is downward and chord length is perpendicular to the ground is mounted on to test and is put down
On platform；
S2, the difference being mounted on multiple vibration excitors in the way of waving direction horizontal addload on the wind electricity blade
Counterweight point position, wherein the horizontal addload is mutual for the loading force direction of the vibration excitor and the gravity direction of the vibration excitor
Perpendicular loading method；
The parameter of S3, the multiple vibration excitors of adjustment make multiple vibration excitor collaboration loads, start multiple excitings
Device keeps vibration amplitude stable and reaches regulation target call.
Preferably, the method for testing fatigue is further comprising the steps of before step S1:
S01, the target moment of flexure according to regulation design a variety of different counterweight schemes to the wind electricity blade, according to respectively matching
The clump weight size and location of counterweight point in double recipe case calculates the moment of flexure deviation profile of the wind electricity blade, resonant frequency refers to
Mark, therefrom selection can use the counterweight scheme of the self weight substitution additional weight block of vibration excitor；
The weight of vibration excitor described in several each counterweight schemes that S02, calculating are selected from S01 and wind electricity blade self weight
Torque size, and compared with the ultimate load of the edgewise direction of the wind electricity blade, the wind electricity blade is assessed shimmy
Direction ability to bear, therefrom obtaining the wind electricity blade can be using in the preferred plan for waving direction progress horizontal addload mode.
Preferably, the method for testing fatigue is further comprising the steps of before step S1:
S01, the target moment of flexure according to regulation design a variety of different counterweight schemes to the wind electricity blade, according to respectively matching
The clump weight size and location of counterweight point in double recipe case calculates the moment of flexure deviation profile of the wind electricity blade, resonant frequency refers to
Mark, therefrom selection can use the counterweight scheme of the self weight substitution additional weight block of vibration excitor；
S02, the gravitational moment of the vibration excitor and the wind electricity blade is applied on the structural model of the wind electricity blade,
The safety coefficient for calculating the wind electricity blade each section in edgewise direction is assessed the wind electricity blade and is born in edgewise direction
Ability, therefrom obtaining the wind electricity blade can be using in the preferred plan for waving direction progress horizontal addload mode.
Preferably, the method for testing fatigue is further comprising the steps of after step S3:
S4, the distribution vibration shape of test moment of flexure and the distribution vibration shape of the target moment of flexure of the strain conversion of each section are carried out pair
Than being distributed the parameter of the vibration excitor of the deviation adjusting corresponding position of the vibration shape according to the two, making the distribution of the test moment of flexure
The distribution vibration shape of the vibration shape and the target moment of flexure keeps almost the same；
S5, the target circulation number that the wind electricity blade carries out testing fatigue is completed, to the equivalent tired of the wind electricity blade
Fatigue product statistical damage, obtains testing fatigue result.
Preferably, the vibration excitor is inertia-type loading equipemtn.
Preferably, the inertia-type loading equipemtn includes motor driven pendulum hookup or motor driven quality block assembly.
Preferably, the vibration excitor is loaded using mechanical linkage resonance mode, the motor of the vibration excitor is fixed on ground
On face or bracket, the mass block or pendulum of the vibration excitor are fixed on the wind electricity blade.
Preferably, the vibration excitor is fluid pressure type vibration excitor or electromagnetic actuator.
Preferably, the loading cycle of the vibration excitor controls within 1ms, and Real-time Feedback loading force.
On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get each preferable reality of the present invention
Apply example.
The positive effect of the present invention is that: the method for testing fatigue of wind electricity blade of the invention by traditional vertical plus
Load is changed to horizontal addload, and carries out multi-point cooperative load by multiple vibration excitors, can not only promote the load of single vibration excitor
Efficiency, moreover it is possible to avoid loading hypodynamic situation when carrying out wind turbine blade testing fatigue, meet wind turbine blade
Testing fatigue demand.The test method is more in line with the setting of fatigue design load than conventional test methodologies, is more nearly wind-powered electricity generation
The temporal-spatial evolution operating condition of Cumulative Fatigue Damage in blade operational process.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for testing fatigue of wind electricity blade in present pre-ferred embodiments.
Fig. 2 is the mounting structure schematic diagram of wind electricity blade and vibration excitor when classic fatigue is tested.
Fig. 3 is the installation site Section A-A schematic diagram of wind electricity blade and vibration excitor in Fig. 2.
The mounting structure schematic diagram of wind electricity blade and vibration excitor when Fig. 4 is testing fatigue in present pre-ferred embodiments.
Fig. 5 is the installation site section B-B schematic diagram of wind electricity blade and vibration excitor in Fig. 4.
Fig. 6 is the mass block actual motion position curve of vibration excitor in traditional Vertical loading method for testing fatigue.
Fig. 7 is single point excitation and multi-point exciting gravitational moment contrast schematic diagram in wind electricity blade testing fatigue.
Fig. 8 is the structural schematic diagram of vibration excitor in present pre-ferred embodiments.
Description of symbols:
Wind electricity blade 1
Vibration excitor 2
Clump weight 3
Steel framework 4
Wooden aerofoil shaped plate 5
Servo motor 6
Screw rod 7
Mass block 8
Specific embodiment
The embodiment for further illustrating the present invention below by the mode of embodiment, but therefore not limiting the present invention to
Among range.
As shown in Figure 1, a kind of method for testing fatigue of wind electricity blade of the invention, comprising the following steps:
S11, the target moment of flexure according to regulation design a variety of different counterweight schemes to wind electricity blade, according to respectively with double recipe
The size and location of the clump weight of counterweight point in case calculates moment of flexure deviation profile, the resonant frequency index of wind electricity blade, therefrom
Selection can use the counterweight scheme of the self weight substitution additional weight block of vibration excitor.In this step, mainly according to requiring to wind
Before electric blade is tested, a variety of testing schemes are designed, therefrom select several self weight substitution additional weights that can use vibration excitor
The counterweight scheme of block.
S12, calculating vibration excitor and the gravitational moment of wind electricity blade self weight from several each counterweight schemes selected in S11 are big
It is small, and compared with the ultimate load of the edgewise direction of wind electricity blade, assessment wind electricity blade in edgewise direction ability to bear, from
In obtain wind electricity blade can using wave direction carry out horizontal addload mode preferred plan.In this step, to several tests
Calculating is further analyzed in scheme, filters out a kind of optimal scheme.
S13, the direction that wind electricity blade 1 is upward with its rear, leading edge is downward and chord length is perpendicular to the ground is mounted on test
On platform.In this step, mainly wind electricity blade 1 is mounted on test platform according to the installation method of horizontal addload, specifically
Mounting structure is with reference to shown in Fig. 4 and Fig. 5.
S14, multiple vibration excitors are matched by the difference being mounted on wind electricity blade in the way of waving direction horizontal addload
Emphasis position, wherein horizontal addload is the mutually perpendicular load side of gravity direction in the loading force direction and vibration excitor of vibration excitor
Formula.In this step, by according to the testing scheme in above-mentioned steps S12, corresponding vibration excitor is mounted on to the difference of wind electricity blade
On counterweight point.
The parameters such as S15, frequency, mass block quality, stroke, phase, the loading cycle for adjusting multiple vibration excitors make multiple sharp
Device collaboration of shaking loads, and starts multiple vibration excitors, keeps vibration amplitude stable and reaches regulation target call.In this step, to sharp
The parameter of vibration device is adjusted, and the vibration amplitude of wind electricity blade is made to reach regulation target call.
S16, the distribution vibration shape of test moment of flexure of each section strain conversion is compared with the distribution vibration shape of target moment of flexure,
It is distributed the parameter of the vibration excitor 2 of the deviation adjusting corresponding position of the vibration shape according to the two, makes the distribution vibration shape and target of testing moment of flexure
The distribution vibration shape of moment of flexure keeps almost the same.In this step, during the test, the parameter of vibration excitor is constantly regulate until reaching
It is required that.
S17, the target circulation number that wind electricity blade carries out testing fatigue is completed, damage is accumulated to the Equivalent Fatigue of wind electricity blade
Wound statistics, obtains testing fatigue result.
By arrange vibration excitor 2 position, the parameters such as frequency, mass block quality, stroke and phase of adjusting vibration exciter 2,
The test macro of promotion wind electricity blade 1 indexs such as moment of flexure deviation, resonant frequency and statistical damage in validation region.Wind electricity blade
It is zero that the design load form of 1 fatigue, which is Periodic Mean, and according to different M values, (M value is that load number and load level are converted
Power exponent, the specific calculation of M value are shown in that blower authenticates guide GL-2010) provide corresponding load amplitude.In wind electricity blade 1
When waving direction using horizontal addload, gravitational moment caused by wind electricity blade 1, vibration excitor 2 and clump weight 3 and blade wave direction
At right angles, gravitational moment is zero to the mean value for waving direction load, and the wave crest and valley value of blade fatigue test load are equal.I.e. originally
The wind electricity blade test method fatigue load mean value of invention is zero, the amplitude phase for waving the direction face PS and the face SS of wind electricity blade 1
Deng.
Traditional Vertical loading is changed to horizontal addload by the method for testing fatigue of wind electricity blade of the invention, and by multiple
Vibration excitor 2 replaces the mode of additional weight block 3 to carry out multi-point cooperative load, can not only promote the load effect of single vibration excitor 2
It can, moreover it is possible to avoid loading hypodynamic situation when carrying out wind turbine blade testing fatigue, meet the tired of wind turbine blade 1
Labor testing requirement.The test method is more in line with the setting of fatigue design load than conventional test methodologies, is more nearly wind-powered electricity generation leaf
The empty evolution operating condition of Cumulative Fatigue Damage in 1 operational process of piece.
In other embodiments, step S12 also may be accomplished by: by the weight of vibration excitor 2 and wind electricity blade 1
Torque is applied on the structural model of wind electricity blade 1, calculates the safety coefficient in each section in edgewise direction of wind electricity blade 1,
Assess wind electricity blade 1 in edgewise direction ability to bear, therefrom obtain wind electricity blade 1 can using waving direction progress horizontal addload
The preferred plan of mode.
In the present embodiment, vibration excitor 2 is inertia-type loading equipemtn.Wherein, inertia-type loading equipemtn can drive for motor
Dynamic pendulum hookup or motor driven quality block assembly.Vibration excitor 2 is loaded using mechanical linkage resonance mode, the electricity of vibration excitor 2
Machine is fixed on ground or bracket, and the mass block or pendulum of vibration excitor 2 are fixed on wind electricity blade 1.In other embodiments
In, vibration excitor 2 can also be fluid pressure type vibration excitor or electromagnetic actuator.The loading cycle of vibration excitor 2 controls within 1ms, and
Real-time Feedback loading force.
In order to meet the testing fatigue requirement of wind turbine blade 1, by studying influence of the gravity to 2 performance of vibration excitor,
The load efficiency of depth excavation vibration excitor 2.The structure of vibration excitor 2 is further analyzed, the required exciting of test macro is established
Relationship between the exciting force of device 2 and its axial force exported.Concrete analysis is using traditional method for testing fatigue and this below
Invention test method.Wherein, " equipment " in following noun refers to that vibration excitor 2 and clump weight 3 etc. are attached on wind electricity blade 1
General name.
(1) traditional Vertical loading method for testing fatigue is used
Since the mass block of vibration excitor 2 is in addition to doing sinusoidal motion relative to the load(ing) point of wind electricity blade 1, also with wind electricity blade
1 swings up and down, therefore mass block should be mass block relative to 1 load(ing) point of wind electricity blade, wind-powered electricity generation leaf relative to the displacement equation on ground
Vector sum of 1 load(ing) point of piece relative to ground displacement equation, mass block actual motion position curve are as shown in Figure 6.That is mass block
Relative to ground displacement equation are as follows:
X (t)=s (t)+A (t)=- S cos ω t-Asin ω t (1)
By this displacement equation to time derivation, mass block is obtained for the rate equation on ground:
υ (t)=x ' (t)=ω S sin ω t- ω Acos ω t (2)
Rate equation is continued to the acceleration equation that mass block is obtained to time derivation for ground:
A (t)=υ (t) '=ω2S cosωt+ω2Asinωt (3)
Then resultant force needed for the movement of motor driven mass block are as follows:
F (t)=ma (t)=m ω2S cosωt+mω2Asinωt (4)
The mass block axial force by gravity and motor powered cylinder in the vertical direction, if electric cylinder output loading is Fs,
Had according to Newton's second law:
F (t)=Fs-mg (5)
When Vertical loading, need to overcome the gravity of mass block, then electric cylinder output loading are as follows:
Fs=F (t)+mg=m ω2S cosωt+mω2Asinωt+mg (6)
It is apparent fromWhen, FsThere is extreme value:
Therefore the axial force of the equipment of Vertical loading are as follows:
Wherein:
M-equipment quality；
ω-resonance system circular frequency；
S-mass block stroke or pendulum radius；
A-blade amplitude；
G-gravity constant.
(2) test method of technical solution of the present invention is used
When blade waves direction testing fatigue, multi-point exciting is changed to by single point excitation scheme, the arrangement of vibration excitor 2 according to
The counterweight point position that testing scheme calculates is selected.The testing fatigue for waving direction is realized by the way of horizontal addload, is made
It obtains vibration excitor 2 and gives full play to efficiency in load, as shown in Figure 4 and Figure 5.
Structure by analyzing vibration excitor 2 promotes it and loads efficiency, for same vibration excitor, when 2 output phase of vibration excitor
When with exciting force, the axial force born required for vibration excitor 2 is compared, wherein the exciting force of vibration excitor 2 are as follows:
Due to not needing to overcome the gravity of mass block when 2 horizontal addload of vibration excitor, therefore the axial force of horizontal addload are as follows:
Below by taking the excitation parameter of certain more than 60 meters of blade as an example: quality m=2000kg, the circular frequency ω of equipment=
3rad/s, stroke S=0.3m, amplitude A=0.4m compare the load Effectiveness Comparison of two kinds of test methods.It is vertical by being calculated
The efficiency directly loaded is only 30% compared with horizontal addload, and there are also 70% potentiality not to play.Therefore add when vibration excitor 2 is horizontal
When load, then the exciting force that vibration excitor 2 exports is identical as the axial force of vibration excitor 2, will greatly liberate the load efficiency of vibration excitor 2,
Vibration excitor 2 loads the essential distinction of efficiency when vibration excitor 2 loads efficiency and conventional vertical load when this is horizontal addload.
The gravitational moment of vibration excitor 2 and clump weight 3, preferably vibration excitor in testing fatigue scheme out will be reduced using multi-point exciting
2 can substitute the scheme of clump weight 3, reduce gravitational moment.Fig. 7 is single point excitation and more under the premise of meeting testing fatigue scheme
The comparison of point exciting gravitational moment, multi-point exciting will reduce gravitational moment 10% or so.Wherein, " ratio " in ordinate is that fatigue is surveyed
The ratio of moment of flexure mean value caused by the self weight of blade self weight, counterweight and vibration excitor and blade loading limit carrying when examination.
Compare shadow of the gravitational moment to blade of equipment self-weight generation in traditional loading method and loading method of the invention
It rings.In Vertical loading mode, because the self weight of vibration excitor 2 is concentrated on one point, it can not be carried out according to the requirement of counterweight
Reasonable distribution.The weight of the vibration excitor 2 as needed for large-scale blade itself reaches 4~5 tons, and vibration excitor 2 cannot be according to scheme meter
The optimal location of calculation is arranged, it is necessary to is mounted on blade close to base region, is not suitable for being arranged in tip region, such as Fig. 2 institute
Show, so that there are limitations for the arrangement of vibration excitor 2 and clump weight 3.
And in technical solution of the present invention, the advantage using multi-point exciting is that vibration excitor 2 can be made miniaturization, utilizes level
The mode of load liberates the potential of vibration excitor 2, so that vibration excitor 2 further realizes light-weight design.According to testing fatigue scheme
The status requirement of middle counterweight point carries out the preferred arrangement of impacting point, coordinates 2 loading method of vibration excitor and counterweight mode is curved to target
The influence of square.Testing fatigue scheme is more flexible to the arrangement of vibration excitor 2 and clump weight 3, and the self weight of vibration excitor 2 can be as matching
Pouring weight 3 is arranged, and increases the adjusting nargin of balance position and size in vibration excitor 2 in scheme.Due to swashing using multiple spot
Vibration, the weight and power of vibration excitor 2 can reduce, and vibration excitor 2 is arranged as a part of counterweight, vibration excitor 2 it is small-sized
Change the reduction for bringing blade gravitational moment.When testing fatigue waves direction, the gravitational moment of wind electricity blade 1 is held by edgewise direction
Load realizes the target of 2 horizontal addload of vibration excitor.2 horizontal addload of vibration excitor is conducive to play the exciting force of equipment, so that vibration excitor
2 design more lightweight.It is more flexible to the adjusting of device parameter in testing fatigue.
Fig. 8 is the structural schematic diagram for the vibration excitor that the present embodiment uses.By as shown in the figure, the basic principle of the vibration excitor is
Servo motor 6 generates the power of rotation, and driving screw rod 7 does straight line and moves back and forth, and generates power by screw rod 7, push mass block 8 along
Guide rail horizontal movement, generated exciting force be substantially equal to servo motor 6 output axial force, concrete principle see it is above-mentioned about
The analysis of exciting force on wind electricity blade.The vibration excitor is made of an exciting portion mass block 8, screw rod 7, servo motor 6, and two are swashed
Vibration portion is symmetrically mounted on steel framework 4, by wind electricity blade mounted in the wooden wing of steel framework 4 in the way of horizontal addload
Profile plate 5.By parameters such as the revolving speed of adjusting servo motor 6 and phases, make power caused by two symmetrical exciting portions
It moves simultaneously, and generated exciting force is identical, prevents occurring torsion phenomenon when wind electricity blade CYCLIC LOADING, the exciting of generation
Power is evenly transferred on wind electricity blade by wooden aerofoil shaped plate 5.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (9)
1. a kind of method for testing fatigue of wind electricity blade, which is characterized in that itself the following steps are included:
S1, the direction that wind electricity blade is upward with its rear, leading edge is downward and chord length is perpendicular to the ground is mounted on test platform；
S2, the different counterweights being mounted on multiple vibration excitors in the way of waving direction horizontal addload on the wind electricity blade
Point position, wherein the horizontal addload is that the loading force direction of the vibration excitor and the gravity direction of the vibration excitor hang down mutually
Straight loading method；
The parameter of S3, the multiple vibration excitors of adjustment make multiple vibration excitor collaboration loads, start multiple vibration excitors,
It keeps vibration amplitude stable and reaches regulation target call.
2. the method for testing fatigue of wind electricity blade as described in claim 1, which is characterized in that before step S1, the fatigue
Test method is further comprising the steps of:
S01, the target moment of flexure according to regulation design a variety of different counterweight schemes to the wind electricity blade, according to respectively with double recipe
The clump weight size and location of counterweight point in case calculates moment of flexure deviation profile, the resonant frequency index of the wind electricity blade, from
Middle selection can use the counterweight scheme of the self weight substitution additional weight block of vibration excitor；
The gravitational moment of vibration excitor described in several each counterweight schemes that S02, calculating are selected from S01 and wind electricity blade self weight
Size, and compared with the ultimate load of the edgewise direction of the wind electricity blade, the wind electricity blade is assessed in edgewise direction
Ability to bear, therefrom obtaining the wind electricity blade can be using in the preferred plan for waving direction progress horizontal addload mode.
3. the method for testing fatigue of wind electricity blade as described in claim 1, which is characterized in that before step S1, the fatigue
Test method is further comprising the steps of:
S01, the target moment of flexure according to regulation design a variety of different counterweight schemes to the wind electricity blade, according to respectively with double recipe
The clump weight size and location of counterweight point in case calculates moment of flexure deviation profile, the resonant frequency index of the wind electricity blade, from
Middle selection can use the counterweight scheme of the self weight substitution additional weight block of vibration excitor；
S02, the gravitational moment of the vibration excitor and the wind electricity blade is applied on the structural model of the wind electricity blade, is calculated
The safety coefficient in the wind electricity blade each section in edgewise direction out assesses the wind electricity blade in edgewise direction and bears energy
Power, therefrom obtaining the wind electricity blade can be using in the preferred plan for waving direction progress horizontal addload mode.
4. the method for testing fatigue of wind electricity blade as described in claim 1, which is characterized in that after step S3, the fatigue
Test method is further comprising the steps of:
S4, the distribution vibration shape the test moment of flexure that the strain of each section converts and the distribution vibration shape of the target moment of flexure compare,
It is distributed the parameter of the vibration excitor of the deviation adjusting corresponding position of the vibration shape according to the two, makes the distribution vibration shape of the test moment of flexure
Keep almost the same with the distribution vibration shape of the target moment of flexure；
S5, the target circulation number that the wind electricity blade carries out testing fatigue is completed, it is tired to the Equivalent Fatigue of the wind electricity blade
Product statistical damage, obtains testing fatigue result.
5. the method for testing fatigue of wind electricity blade as described in claim 1, which is characterized in that the vibration excitor adds for inertia-type
Carry equipment.
6. the method for testing fatigue of wind electricity blade as claimed in claim 5, which is characterized in that the inertia-type loading equipemtn packet
Include motor driven pendulum hookup or motor driven quality block assembly.
7. the method for testing fatigue of wind electricity blade as claimed in claim 6, which is characterized in that the vibration excitor is using mechanical
The load of connecting rod resonance mode, the motor of the vibration excitor are fixed on ground or bracket, the mass block or pendulum of the vibration excitor
Hammer is fixed on the wind electricity blade.
8. the method for testing fatigue of wind electricity blade as described in claim 1, which is characterized in that the vibration excitor swashs for fluid pressure type
Shake device or electromagnetic actuator.
9. such as the method for testing fatigue of the described in any item wind electricity blades of claim 1-8, which is characterized in that the vibration excitor
Loading cycle controls within 1ms, and Real-time Feedback loading force.
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| CN110749408A (en) * | 2019-11-09 | 2020-02-04 | 山东理工大学 | Multipoint excitation equipment and method for hundred-meter-level wind power blade fatigue test |
| CN111721491A (en) * | 2020-07-21 | 2020-09-29 | 上海电气风电集团股份有限公司 | Fan full-size blade two-axis loading fatigue test method and two-axis loading equipment |
| CN111734585A (en) * | 2020-06-18 | 2020-10-02 | 上海电气风电集团股份有限公司 | Method and device for determining limit load of wind driven generator and readable storage medium |
| CN111795899A (en) * | 2020-07-30 | 2020-10-20 | 上海电气风电集团股份有限公司 | Torsion loading equipment and blade torsion testing method |
| CN113029480A (en) * | 2019-12-23 | 2021-06-25 | 江苏金风科技有限公司 | Blade fatigue testing method and blade fatigue testing system of wind generating set |
| CN113378327A (en) * | 2021-07-02 | 2021-09-10 | 吉林重通成飞新材料股份公司 | Wind power blade trailing edge cracking resistance design method, device, equipment and storage medium |
| CN113447376A (en) * | 2021-07-05 | 2021-09-28 | 山东理工大学 | Bending moment matching optimization method for wind power blade double-shaft fatigue test |
| CN113624428A (en) * | 2021-07-27 | 2021-11-09 | 中国科学院工程热物理研究所 | Resonance type double-shaft fatigue loading method for wind turbine blade |
| CN114354405A (en) * | 2022-01-10 | 2022-04-15 | 连云港中复连众复合材料集团有限公司 | Excitation device and excitation method for fatigue test |
| CN115031948A (en) * | 2022-08-10 | 2022-09-09 | 常州市宏发纵横新材料科技股份有限公司 | Modularized blade fatigue life prediction method and device, control device and storage medium |
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| CN115371924A (en) * | 2022-08-23 | 2022-11-22 | 山东理工大学 | Wind power blade fatigue excitation method and device based on mechanical linkage seesaw structure |
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