CN104236892A - Method for testing wind turbine blade static force loading vertical displacement and deformation - Google Patents
Method for testing wind turbine blade static force loading vertical displacement and deformation Download PDFInfo
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- CN104236892A CN104236892A CN201410524472.7A CN201410524472A CN104236892A CN 104236892 A CN104236892 A CN 104236892A CN 201410524472 A CN201410524472 A CN 201410524472A CN 104236892 A CN104236892 A CN 104236892A
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Abstract
The invention discloses a method for testing wind turbine blade static force loading vertical displacement and deformation. The method includes: disposing a first displacement testing device and a second displacement testing device near a blade to-be-tested point O; measuring the distance between each displacement testing device and O; performing testing loading on a blade to allow the same to reach rated load; then measuring the distance between each displacement testing device and O at this moment; calculating the area of a triangle OAB before deformation and the area of a triangle O'AB after deformation according the Heron's formula, determining the height of each triangle according to known bottom edge length, and calculating the vertical displacement h of the blade by calculating the difference of the heights of the two triangles. Compared with the prior art, the method is simple, ingenious in structure, high in accuracy, high in operability and easy to use and popularize in actual work.
Description
Technical field
The invention belongs to testing method field, when one, for pneumatic equipment blades, large deformation occurs in static loading test, the distortion of its vertical displacement is carried out to the method for accurately test.
Background technology
In recent years, along with the fast development of wind power technology, blade of wind-driven generator length increases fast, and blade carries effect bottom offset at wind and is out of shape also increasing, and usual static loading test is a kind of important method whether checking blade construction intensity and structural stability meet Design and manufacture requirement.In blade static loading test process, accurately need test the displacement deformation of blade at vertical direction, to judge whether the rigidity of blade meets design requirement.Pneumatic equipment blades its blade tip distortion when static loading test of current 70m length will reach 20m.When blade generation large deformation, adopt traditional displacement measurement method can not the displacement (see Fig. 1) of accurate pilot blade in the vertical direction, and there is larger test error, the accuracy of test figure and the referential to blade design will be affected to a certain extent.
Summary of the invention
The deformable blade method of testing that current tradition is commonly used as shown in Figure 1, line OB before test loads between displacement tester with blade measuring point is vertical with level ground, wherein OB is before blade load deflection, displacement measuring points is apart from the elemental height of level ground, but after test loads deformable blade, line O'B between displacement tester with blade measuring point is no longer vertical with level ground, now deducting OB with O'B is not the deformation values h of blade at vertical direction yet, therefore uses the method test error larger.
The present invention is directed to traditional wind electricity blade Large travel range deformation test Problems existing, propose a kind of new method of testing, can effectively solve above problem.
The object of the invention is realized by following technical proposals:
A method of testing for pneumatic equipment blades static loading vertical displacement distortion, testing procedure is as follows:
A, blade 2 is arranged on testing table 1;
B, near the O of blade measured point, place a displacement tester 4, No. two displacement testers 5, measure distance OB, the OA of two displacement testers and blade measured point O;
C, carry out test be loaded into rated load to blade 2, the position of described blade measured point O moves to O';
D, measure distance O'B, the O'A of now two displacement testers and measured point O';
E, calculate the area of first three dihedral Δ OAB of deformable blade and load deflection Vee formation shape Δ O'AB respectively according to Heron's formula, and obtain two leg-of-mutton height values according to known base length AB, both subtraction calculations go out the shift value h of blade in the vertical direction; Computing formula is as follows:
The girth d of triangle Δ OAB calculates: d=AB+OA+OB
Triangle area S
Δ OABcalculate: S
Δ OAB=(1/2d (1/2d-AB) (1/2d-OA) (1/2d-OB))
1/2
The high OC of triangle Δ OAB calculates: OC=2S
Δ OAB/ AB
In like manner, the high O'C' obtaining triangle Δ O'AB can just be calculated
Finally, blade calculates at the displacement h of vertical direction: h=O'C'-OC.
Alternately, the method for testing of above-mentioned a kind of pneumatic equipment blades static loading vertical displacement distortion, a displacement tester 4, No. two displacement testers 5 are positioned at the below of blade measured point.Alternately, the method of testing of above-mentioned a kind of pneumatic equipment blades static loading vertical displacement distortion, the displacement that after the distance between a described displacement tester 4, No. two displacement testers 5 is more than or equal to deformable blade, measured point occurs in the horizontal direction.
Alternately, the method for testing of above-mentioned a kind of pneumatic equipment blades static loading vertical displacement distortion, a displacement tester 4 is perpendicular to the ground with the line OB of blade measured point O.
Alternately, the method for testing of above-mentioned a kind of pneumatic equipment blades static loading vertical displacement distortion, the line OB of a displacement tester 4 and blade measured point O and ground out of plumb.
Alternately, the method for testing of above-mentioned a kind of pneumatic equipment blades static loading vertical displacement distortion, tests rope 6 by No. one between described blade measured point with a displacement tester 4 and is connected; Test rope 7 by No. two between described blade measured point with No. two displacement testers 5 to be connected.
Alternately, the method for testing of above-mentioned a kind of pneumatic equipment blades static loading vertical displacement distortion, adopts stay-supported type displacement sensor, records the length value of rope OA, OB, O'B, O'A..Use the method for testing that a kind of pneumatic equipment blades static loading vertical displacement is out of shape, in the displacement of vertical direction when test fan blade or long beam shape object generation large deformation.
Use a kind of pneumatic equipment blades static loading vertical displacement deformation test method, the perpendicular displacement in the horizontal direction when deforming of test fan blade or long beam shape object.
Use as a kind of pneumatic equipment blades static loading vertical displacement deformation test method, O ' after described measured point O, a displacement tester 4, No. two displacement testers 5, loading puts in the same plane, measures the perpendicular displacement of measured point in described plane.
Compared with prior art, beneficial effect of the present invention:
1, traditional approach is after test loads deformable blade, line between displacement tester with blade measuring point is no longer vertical with level ground, now deducting OB with the O'B after loading is not the deformation values h of blade at vertical direction yet, and the length due to blade is general longer, causes test error larger.Compare traditional approach, use the distance that records of the method to be actual range, and the displacement deformation value h gone out by strict formulae discovery is more accurate.
2, the method for testing process in the present invention is simple, uses equipment less, workable, is easy to application in real work, in the displacement of vertical direction when can be used for testing fan blade or other long beam shape object generation large deformation.
Accompanying drawing explanation
Fig. 1 is traditional blade vertical displacement deformation test method schematic diagram;
Fig. 2 is the blade vertical displacement deformation test method schematic diagram in the present invention.
Wherein: 1 be testing table, 2 be blade, 3 be blade root for blade tip, 4 be a displacement tester, 5 be No. two displacement testers, 6 be a test rope, 7 is No. two test ropes, 8.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
All features disclosed in this instructions, or the step in disclosed all methods or process, except the speciality mutually repelled and/or step, all can combine by any way, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object, namely, unless specifically stated otherwise, an embodiment in a series of equivalence of each feature or similar characteristics.
Before blade carries out static loading test, a displacement tester 4, No. two displacement testers 5 are placed near blade 2 displacement measuring points O, the measuring point O of described two displacement testers and blade forms a triangle Δ OAB jointly, as shown in Figure 2, should L be maintained a certain distance between two displacement testers, can with reference to blade measuring point O theoretical displacement deformation values along length of blade direction in loading procedure.The test rope 6,7 of two displacement testers is fixed on B, A point position, and measures rope lengths OA, the OB now between two displacement testers and blade measuring point O.When test is loaded into rated load, again measure the length O'B that the final length O'A of No. one of now two displacement testers test rope 6, No. two test ropes 7 are final, the area of first three dihedral Δ OAB of deformable blade and load deflection Vee formation shape Δ O'AB is calculated thus respectively according to Heron's formula, finally obtain two leg-of-mutton height values according to known base length AB, both subtract each other the shift value h that just accurately can calculate blade in the vertical direction.
Concrete implementation step is as follows:
Blade 2 is arranged on testing table 1 according to testing requirements by A, blade.
B, before blade loads, two displacement testers are placed near the O of blade measured point, an i.e. displacement tester 4, No. two displacement testers 5, a described displacement tester 4 is positioned at the B place, below of blade measured point O, and a described displacement tester 4, No. two displacement testers 5 are positioned on the straight line at orthogonal projection place of blade 2.A described displacement tester 4 is perpendicular to the ground with the line OB of blade measured point O, also can out of plumb.No. two displacement testers 5 are arranged on the A place, position from displacement tester 4 certain distance L, a described displacement tester 4 and No. two displacement testers 5 are on same straight line at blade 2 length direction, and the distance L both requiring is more than or equal to measured point O in the displacement with a described displacement tester 4, No. two displacement tester 5 line parallel directions.Be fixed on the measured point O of blade 2 by the test rope 6 and 7 of two displacement testers respectively, then two displacement testers and blade 2 measured point O form a triangle Δ OAB jointly, as shown in Figure 2.
C, measure the length value of OA and OB of the rope loading the first two displacement tester, if employing stay-supported type displacement sensor, the length value of rope OA and OB can be obtained according to its output signal, and measure the distance AB between two displacement testers, i.e. distance L simultaneously.
D, test is carried out to blade 2 be loaded into rated load.
E, again measure the length O'A of now test length O'B and No. two of rope 6 test rope 7.
F, to calculate the area of Δ O'AB after Δ OAB and load deflection before blade load deflection respectively according to Heron's formula, then two leg-of-mutton height value OC and O'C' are obtained according to known base length AB, wherein OC is before blade load deflection, displacement measuring points is apart from the elemental height of level ground, under both subtract each other and just accurately can calculate test load, the shift value h of blade in the vertical direction, circular is as follows:
The girth (d) of triangle (Δ OAB) calculates: d=AB+OA+OB
Triangle area (S
Δ OAB) calculate: S
Δ OAB=(1/2d (1/2d-AB) (1/2d-OA) (1/2d-OB))
1/2
The height (OC) of triangle (Δ OAB) calculates: OC=2S
Δ OAB/ AB
In like manner, the height (O'C') obtaining triangle (Δ O'AB) can just be calculated
Finally, blade calculates in the displacement (h) of vertical direction: h=O'C'-OC.
Use the method, also can test the perpendicular displacement in level or other direction when fan blade or other long beam shape object deform.As long as ensure that the O ' after described measured point O, a displacement tester 4, No. two displacement testers 5, loading puts in the same plane, the perpendicular displacement of measured point in described plane just can be measured.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of testing for pneumatic equipment blades static loading vertical displacement distortion, is characterized in that: testing procedure is as follows:
A, blade (2) is arranged on testing table (1);
B, near the O of blade measured point place a displacement tester (4), No. two displacement testers (5), measure distance OB, the OA of two displacement testers and blade measured point O;
C, carry out test be loaded into rated load to blade (2), the position of described blade measured point O moves to O ';
D, measure distance O ' B, O of now two displacement testers and measured point O ' ' A;
E, calculate the area of first three dihedral Δ OAB of deformable blade and load deflection Vee formation shape Δ O ' AB respectively according to Heron's formula, and obtain two leg-of-mutton height values according to known base length AB, both subtraction calculations go out the shift value h of blade in the vertical direction; Computing formula is as follows:
The girth d of triangle Δ OAB calculates: d=AB+OA+OB
Triangle area S
Δ OABcalculate: S
Δ OAB=(1/2d (1/2d-AB) (1/2d-OA) (1/2d-OB))
1/2
The high OC of triangle Δ OAB calculates: OC=2S
Δ OAB/ AB
In like manner, the height (O ' C ') obtaining triangle (Δ O ' AB) can just be calculated
Finally, blade calculates in the displacement (h) of vertical direction: h=O ' C '-OC.
2. the method for testing of a kind of pneumatic equipment blades static loading vertical displacement distortion as claimed in claim 1, is characterized in that: a displacement tester (4), No. two displacement testers (5) are positioned at the below of blade measured point.
3. the method for testing of a kind of pneumatic equipment blades static loading vertical displacement distortion as claimed in claim 1, is characterized in that: the displacement that after the distance between a described displacement tester (4), No. two displacement testers (5) is more than or equal to deformable blade, measured point occurs in the horizontal direction.
4. the method for testing of a kind of pneumatic equipment blades static loading vertical displacement distortion as claimed in claim 2, is characterized in that: a displacement tester (4) is perpendicular to the ground with the line OB of blade measured point O.
5. the method for testing of a kind of pneumatic equipment blades static loading vertical displacement distortion as claimed in claim 2, is characterized in that: the line OB of a displacement tester (4) and blade measured point O and ground out of plumb.
6. the method for testing of a kind of pneumatic equipment blades static loading vertical displacement distortion as claimed in claim 1, is characterized in that: test rope (6) by No. one between described blade measured point with a displacement tester (4) and be connected; Test rope (7) by No. two between described blade measured point with No. two displacement testers (5) to be connected.
7. the method for testing of a kind of pneumatic equipment blades static loading vertical displacement distortion as claimed in claim 1, is characterized in that: adopt stay-supported type displacement sensor, record the length value of rope OA, OB, O ' B, O ' A.
8. use the method for testing of a kind of pneumatic equipment blades static loading vertical displacement distortion as claimed in claim 1, in the displacement of vertical direction when test fan blade or long beam shape object generation large deformation.
9. use a kind of pneumatic equipment blades static loading vertical displacement deformation test method as claimed in claim 1, the perpendicular displacement in the horizontal direction when deforming of test fan blade or long beam shape object.
10. use a kind of pneumatic equipment blades static loading vertical displacement deformation test method as claimed in claim 1, O ' after described measured point O, a displacement tester 4, No. two displacement testers 5, loading puts in the same plane, measures the perpendicular displacement of measured point in described plane.
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Cited By (6)
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| CN105181318A (en) * | 2015-09-23 | 2015-12-23 | 华北电力大学（保定） | Wind power generator blade bending-torsional coupling vector measuring device |
| CN105258651A (en) * | 2015-11-05 | 2016-01-20 | 东莞市科隆威自动化设备有限公司 | PCB warpage detection method |
| CN105571503A (en) * | 2015-11-27 | 2016-05-11 | 山东理工大学 | Wind-power blade vertical static loading two-way displacement deformation precise measuring method and device |
| CN108152130A (en) * | 2017-11-20 | 2018-06-12 | 上海艾港风电科技发展有限公司 | Three side method wind electricity blade static test methods |
| CN108798995A (en) * | 2017-05-05 | 2018-11-13 | 北京航天斯达科技有限公司 | A kind of wind electricity blade static(al) control method, unit and system |
| CN109307494A (en) * | 2018-09-19 | 2019-02-05 | 陕西飞机工业（集团）有限公司 | A kind of aircraft handling pedal horizontal displacement measurement tool and its measurement method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105181318A (en) * | 2015-09-23 | 2015-12-23 | 华北电力大学（保定） | Wind power generator blade bending-torsional coupling vector measuring device |
| CN105181318B (en) * | 2015-09-23 | 2018-08-10 | 华北电力大学（保定） | A kind of blade of wind-driven generator Torsion Coupling vector measurement device |
| CN105258651A (en) * | 2015-11-05 | 2016-01-20 | 东莞市科隆威自动化设备有限公司 | PCB warpage detection method |
| CN105571503A (en) * | 2015-11-27 | 2016-05-11 | 山东理工大学 | Wind-power blade vertical static loading two-way displacement deformation precise measuring method and device |
| CN105571503B (en) * | 2015-11-27 | 2018-02-02 | 山东理工大学 | A kind of wind electricity blade Vertical Static loading bidirectional displacement deformation accurately measures method and device |
| CN108798995A (en) * | 2017-05-05 | 2018-11-13 | 北京航天斯达科技有限公司 | A kind of wind electricity blade static(al) control method, unit and system |
| CN108798995B (en) * | 2017-05-05 | 2021-01-15 | 北京航天斯达科技有限公司 | Static force control method, unit and system for wind power blade |
| CN108152130A (en) * | 2017-11-20 | 2018-06-12 | 上海艾港风电科技发展有限公司 | Three side method wind electricity blade static test methods |
| CN109307494A (en) * | 2018-09-19 | 2019-02-05 | 陕西飞机工业（集团）有限公司 | A kind of aircraft handling pedal horizontal displacement measurement tool and its measurement method |
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Effective date of registration: 20160420 Address after: 618000 Sichuan Province, Deyang city Huashan road two No. 2 Applicant after: DONGFANG ELECTRIC WIND POWER CO., LTD. Address before: 618000 Jiangxi hi tech Industrial Park, Sichuan, Jinsha Road, No. 666, No. Applicant before: Dongfang Turbine Co., Ltd., Dongfang Electric Group |
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Application publication date: 20141224 |