CN105181318A - Wind power generator blade bending-torsional coupling vector measuring device - Google Patents
Wind power generator blade bending-torsional coupling vector measuring device Download PDFInfo
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- CN105181318A CN105181318A CN201510608815.2A CN201510608815A CN105181318A CN 105181318 A CN105181318 A CN 105181318A CN 201510608815 A CN201510608815 A CN 201510608815A CN 105181318 A CN105181318 A CN 105181318A
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Abstract
The invention provides a wind power generator blade bending-torsional coupling vector measuring device comprising a clamping mechanism, a load applying mechanism and a measurement performing mechanism. The clamping mechanism is matched with the root cylinder of a measured blade. The load applying mechanism is matched with the blade tip of the measured blade. The measurement performing mechanism comprises displacement sensors, force sensors, a static strain measuring system and a computer. The displacement sensors are distributed at the front end and the rear end of the cross sections of different positions of the measured blade. The force sensors are installed on the load applying mechanism. The input end of the static strain measuring system is connected with the displacement sensors and the force sensors, and the output end is connected with the computer. Accurate measurement and calculation of the bending-torsional coupling characteristic of the blade can be realized before installation of a wind power generator so that reliable operation of the wind power generator can be guaranteed.
Description
Technical field
The present invention relates to a kind of measurement mechanism, especially a kind of blade of wind-driven generator Torsion Coupling vector measurement device, belong to technical field of power generation.
Background technology
Blade of wind-driven generator is the critical component of aerogenerator, compound substance is often selected to make, owing to containing the fiber cloth with different laying angle and overlay thickness in compound substance, compound substance is made to have anisotropic feature, therefore blade all can twist simultaneously be out of shape and flexural deformation under pure bending or pure torsional load, and namely composite material blade has Torsion Coupling deformation characteristic.The Torsion Coupling characteristic of blade determines the deformational behavior of blade under load effect, utilize the anisotropic characteristic of wind power generator blade material, blade can with the change of wind speed, automatic change shape, produce rational torsional deformation, thus widen the normal operating air velocity scope of wind energy conversion system, improve Wind energy extraction ability, reduce the shock load that blade bears, and improve its security performance when high wind speed.
The Torsion Coupling characteristic of blade of wind-driven generator belongs to the inherent characteristic of blade integral, by blade Torsion Coupling vector
represent, Torsion Coupling vector
namely blade each aerofoil section Torsion Coupling vector α composition vector (
), cross section Torsion Coupling vector α be produce angle of bend β and windup-degree θ ratio (
).In order to ensure the reliability of aerogenerator work, before aerogenerator installation, need the Torsion Coupling vector to blade
calculate.
Summary of the invention
The object of the present invention is to provide a kind of blade of wind-driven generator Torsion Coupling vector measurement device, to realize the accurate measuring and calculating to blade Torsion Coupling characteristic before aerogenerator installation, ensure the reliability service of aerogenerator.
The object of the invention is to be achieved through the following technical solutions:
A kind of blade of wind-driven generator Torsion Coupling vector measurement device, comprises clamping device, load applying mechanism and measures topworks; The structure of described clamping device is mated with the root right cylinder of measured blade, and the structure of described load applying mechanism is mated with the blade tip of measured blade; Described measurement topworks comprises displacement transducer, force snesor, static strain measuring system and computing machine, institute's displacement sensors is arranged in leading edge and the trailing edge place in measured blade diverse location cross section, described force snesor is arranged in load applying mechanism, described static strain measuring system input end is connected with displacement transducer and force snesor, and its output terminal is connected with computing machine.
Above-mentioned blade of wind-driven generator Torsion Coupling vector measurement device, described load applying mechanism comprises hydraulic loaded assembly, auxiliary clamp, the first support and the second support; Described auxiliary clamp is sleeved on the blade tip position of measured blade, is made up of upper and lower two grip blocks, forms the clamping chamber of mating with measured blade tip at the middle part of upper and lower two grip blocks, arranges loading workplace at two ends, upper and lower two grip block left and right.
Above-mentioned blade of wind-driven generator Torsion Coupling vector measurement device, described hydraulic loaded assembly is made up of the second hydraulic power unit and hydraulic cylinder, described second hydraulic power unit is connected with hydraulic cylinder, hydraulic control system is provided with in hydraulic power unit, described hydraulic cylinder comprises the first hydraulic cylinder be fixed on the first support and the second hydraulic cylinder fixed on the secondary support bracket, the piston rod of described first hydraulic cylinder stretches downwards, the piston rod of described second hydraulic cylinder stretches upwards, and the piston rod of two hydraulic cylinders is corresponding with the loading workplace at two ends, auxiliary clamp left and right respectively.
Above-mentioned blade of wind-driven generator Torsion Coupling vector measurement device, the clamping cavity wall of described auxiliary clamp arranges rubber blanket.
Above-mentioned blade of wind-driven generator Torsion Coupling vector measurement device, described first support and the second support are removable frame.
Above-mentioned blade of wind-driven generator Torsion Coupling vector measurement device, described clamping device comprises grip slipper, hydraulically operated fixture and the first hydraulic power unit, described grip slipper is fixed on level ground, and grip slipper arranges blades installation hole, is evenly arranged three cover hydraulically operated fixtures at the periphery in blades installation hole.
Above-mentioned blade of wind-driven generator Torsion Coupling vector measurement device, described hydraulically operated fixture comprises clamping oil cylinder and grip block, described clamping oil cylinder is connected with the first hydraulic power unit, and the piston rod of clamping oil cylinder and grip block are fixed and assembled, and described grip block is provided with the arc clamping face mated with root of blade.
The present invention is fixed by the root right cylinder of clamping device by measured blade, again auxiliary clamp in load applying mechanism is sleeved on the blade tip position of measured blade, then respectively the thrust that size is identical, direction is contrary is imposed to the loading workplace at two ends, auxiliary clamp left and right by the first hydraulic cylinder be fixed on the first support with fixing the second hydraulic cylinder on the secondary support bracket, make measured blade under torsional moment effect, produce torsional bending distortion, the information collected is passed to computing machine by static strain measuring system by the displacement transducer being now arranged in measured blade diverse location cross section leading edge and trailing edge, the power load information collected is passed to computing machine by the force snesor be simultaneously arranged in load applying mechanism, the information analysis by the program arranged in computing machine, diverse location cross section leading edge and trailing edge displacement sensor gathered again, calculate, obtain the shift value in different torque load situation lower blade diverse location cross section leading edge and trailing edge, then the Torsion Coupling vector α value of blade of wind-driven generator is calculated according to this shift value, and then draw Torsion Coupling vector
.Because the grip block in clamping device of the present invention is by clamping hydraulic oil cylinder driving, and the first support and the second support are removable frame in load applying mechanism, therefore the present invention has good universal performance, is applicable to the measurement of the blade of wind-driven generator to different model.As can be seen here, present invention achieves the accurate measuring and calculating to blade Torsion Coupling characteristic before aerogenerator installation, ensure that the reliability service of aerogenerator.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is general structure schematic diagram of the present invention;
Fig. 2 is clamping device front view of the present invention;
Fig. 3 is clamping device side view of the present invention;
Fig. 4 is load applying structural scheme of mechanism of the present invention;
Fig. 5 is auxiliary fixture structure schematic diagram in load applying mechanism of the present invention;
Fig. 6 is measurement topworks of the present invention schematic diagram;
Fig. 7 is displacement transducer installation site, place, measured blade a certain sectional position schematic diagram;
Fig. 8 is measured blade a certain sectional position change schematic diagram before and after load loads;
Fig. 9 is the schematic diagram calculating Torsion Coupling vector α value according to the shift value of blade different cross section leading edge and trailing edge;
Figure 10 is that different cross section flexural deformation w opens up to coordinate z change curve with blade.
In figure, each list of reference numerals is: 1, clamping device, 1-1, grip slipper, 1-1-1, blades installation hole, 1-2, clamping oil cylinder, 1-3, grip block, 1-4, first hydraulic power unit, 2, load applying mechanism, 2-1, first support, 2-2, first hydraulic cylinder, 2-3, second hydraulic cylinder, 2-4, auxiliary clamp, 2-4-1, grip block, 2-4-2, load workplace, 2-4-3, clamping chamber, 2-4-4, rubber blanket, 2-5, second support, 2-6, second hydraulic power unit, 3, measure topworks, 3-1, displacement transducer, 3-2, static strain measuring system, 3-3, computing machine, 3-4, force snesor, 4, measured blade, 4-1, leading edge, 4-2, trailing edge.
Embodiment
Referring to Fig. 1, Fig. 6, Fig. 7, the present invention includes clamping device 1, load applying mechanism 2 and measurement topworks 3, the structure of described clamping device 1 is mated with the root right cylinder of measured blade 4, the structure of described load applying mechanism 2 is mated with the blade tip of measured blade 4, described measurement topworks 3 comprises displacement transducer 3-1, force snesor 3-4, static strain measuring system 3-2 and computing machine 3-3, institute displacement sensors 3-1 is arranged in leading edge 4-1 and the trailing edge 4-2 place in measured blade 4 diverse location cross section, described force snesor 3-4 is arranged in load applying mechanism 2, described static strain measuring system 3-2 input end is connected with displacement transducer 3-1 and force snesor 3-4, its output terminal is connected with computing machine 3-3.
Referring to Fig. 1, Fig. 4, Fig. 5, load applying mechanism 2 of the present invention comprises hydraulic loaded assembly, auxiliary clamp 2-4, the first support 2-1 and the second support 2-5; Described auxiliary clamp 2-4 is sleeved on the blade tip position of measured blade 4, be made up of upper and lower two grip block 2-4-1, the clamping chamber 2-4-3 mated with measured blade tip is formed at the middle part of upper and lower two grip block 2-4-1, arrange at two ends, upper and lower two grip block left and right and load workplace 2-4-2, the clamping chamber 2-4-3 inwall of described auxiliary clamp 2-4 arranges rubber blanket 2-4-4; Described hydraulic loaded assembly is made up of the second hydraulic power unit 2-6 and hydraulic cylinder, and described second hydraulic power unit 2-6 is connected with hydraulic cylinder, and arranges hydraulic control system in the second hydraulic power unit 2-6; Described hydraulic cylinder comprises the first hydraulic cylinder 2-2 be fixed on the first support 2-1 and the second hydraulic cylinder 2-3 be fixed on the second support 2-5, the piston rod of described first hydraulic cylinder 2-2 stretches downwards, the piston rod of described second hydraulic cylinder 2-3 stretches upwards, and the piston rod of two hydraulic cylinders is corresponding with the loading workplace 2-4-2 at auxiliary clamp about 2-4 two ends respectively; Described first support 2-1 and the second support 2-5 is removable frame.
Referring to Fig. 1, Fig. 2, Fig. 3, clamping device 1 of the present invention comprises grip slipper 1-1, hydraulically operated fixture and the first hydraulic power unit 1-4, described grip slipper 1-1 is fixed on level ground, grip slipper 1-1 arranges blades installation hole 1-1-1, is evenly arranged three cover hydraulically operated fixtures at the periphery of blades installation hole 1-1-1; Described hydraulically operated fixture comprises clamping oil cylinder 1-2 and grip block 1-3, described clamping oil cylinder 1-2 is connected with the first hydraulic power unit 1-4, the piston rod of clamping oil cylinder 1-2 and grip block 1-3 fix and assemble, and described grip block 1-3 is provided with the arc clamping face mated with root of blade.
Referring to Fig. 1, Fig. 7, wind machine's laminae made from composite material, under the effect of load, not only can occur bending and deformation, and also can twist distortion simultaneously.In order to calculate the Torsion Coupling deformation characteristic that composite material blade structure produces, need to apply pure bending load or pure torsional load to blade.Due to the anisotropy of blade material and the scrambling in cross section, the flexural center of blade profile is made to be difficult to find, when therefore applying the power of a vertical direction on pneumatic equipment blades to be measured, can not ensure that this power by chance passes through flexural center, namely can not ensure to apply pure bending load to blade, so, present invention employs and purely turn round load load mode, namely a pair equivalent reverse parallel force is applied to blade tip position to be measured.
The Torsion Coupling characteristic of blade of wind-driven generator is by vector
describe, in formula,
(i=1,2,3 ... n) be i-th, blade cross section Torsion Coupling vector, namely blade when bearing pure torsional load at the angle of bend that this cross section produces
and windup-degree
θratio (
).Therefore, when calculating the Torsion Coupling vector Δ of blade, the angle of bend to each cross section of blade is first needed
and windup-degree
θvalue is calculated, and bending blade angle
and windup-degree
θwith cross section leading edge 4-1 after blade bearing load and trailing edge 4-2 place's displacement closely related, so by the measurement of blade profile leading edge 4-1 and trailing edge 4-2 place shift value is calculated to blade profile Torsion Coupling vector α
i.
Referring to Fig. 1 ~ Fig. 7, the present invention is a kind of blade of wind-driven generator Torsion Coupling vector measurement device, its course of work is: fixed by the root right cylinder of measured blade 4, then auxiliary clamp 2-4 in load applying mechanism 2 is sleeved on the blade tip position of measured blade 4; Adjusted position displacement sensor 3-1, makes the deformation position of measured blade 4 under deadweight as the initial position of sensor measurement; By loading suitable torsional load, make measured blade 4 that low-angle torsional deflection (as windup-degree is less than 2 °) occur, again by being arranged in the displacement transducer 3-1 of measured blade 4 diverse location cross section leading edge 4-1 and trailing edge 4-2 place, the change in displacement information at leading edge 4-1 and trailing edge 4-2 place is passed to computing machine 3-3 by static strain measuring system 3-2, is calculated by computing machine 3-3 and show the displacement of measured blade 4 leading edge 4-1
u 1with the displacement of trailing edge 4-2
u 2.
Referring to Fig. 8, Fig. 9, Figure 10, according to
u 1with
u 2numerical value can calculate angle of bend respectively
and windup-degree
θvalue, thus calculate Torsion Coupling vector further
αvalue.Its theoretical foundation is: before AC, BD are respectively loading, load the string of a musical instrument in rear blade cross section, chord length is L; Because the windup-degree of blade is very little, therefore straight-line displacement is approximately equal to camber line displacement, and namely AB is the displacement of measured blade 4 leading edge 4-1
u 1; CD is the displacement of measured blade 4 trailing edge 4-2
u 2, BD straight line parallel is moved to AE position, then the windup-degree of cross section torsional deflection:
；
Section flexure distortion represents with the distortion FH (FH=FI-HI) that 1/4 chord length place is corresponding, is denoted as w:
w
=FI-HI
=
or
Curve w=w (z) is made in the flexural deformation of different cross section, the curve that the flexural deformation w obtaining different cross section shown in Figure 10 changes to coordinate z with blade exhibition.By w differentiate, obtain section flexure angle
, namely
;
Then namely by formula
calculate cross section Torsion Coupling vector
αvalue, finally obtain describing blade Torsion Coupling characteristic vectorial Δ (
).
Claims (7)
1. a blade of wind-driven generator Torsion Coupling vector measurement device, is characterized in that, it comprises clamping device (1), load applying mechanism (2) and measures topworks (3); The structure of described clamping device (1) is mated with the root right cylinder of measured blade (4), and the structure of described load applying mechanism (2) is mated with the blade tip of measured blade (4); Described measurement topworks (3) comprises displacement transducer (3-1), force snesor (3-4), static strain measuring system (3-2) and computing machine (3-3), and institute displacement sensors (3-1) is arranged in leading edge (4-1) and trailing edge (4-2) place in measured blade (4) diverse location cross section; Described force snesor (3-4) is arranged in load applying mechanism (2), and described static strain measuring system (3-2) input end is connected with displacement transducer (3-1) and force snesor (3-4), and its output terminal is connected with computing machine (3-3).
2. blade of wind-driven generator Torsion Coupling vector measurement device according to claim 1, is characterized in that, described load applying mechanism (2) comprises hydraulic loaded assembly, auxiliary clamp (2-4), the first support (2-1) and the second support (2-5); Described auxiliary clamp (2-4) is sleeved on the blade tip position of measured blade (4), be made up of upper and lower two grip blocks (2-4-1), form the clamping chamber (2-4-3) of mating with measured blade tip at the middle part of upper and lower two grip blocks (2-4-1), arrange at two ends, upper and lower two grip block left and right and load workplace (2-4-2).
3. blade of wind-driven generator Torsion Coupling vector measurement device according to claim 2, it is characterized in that, described hydraulic loaded assembly is made up of the second hydraulic power unit (2-6) and hydraulic cylinder, described second hydraulic power unit (2-6) is connected with hydraulic cylinder, hydraulic control system is provided with in hydraulic power unit, described hydraulic cylinder comprises the first hydraulic cylinder (2-2) be fixed on the first support (2-1) and the second hydraulic cylinder (2-3) be fixed on the second support (2-5), the piston rod of described first hydraulic cylinder (2-2) stretches downwards, the piston rod of described second hydraulic cylinder (2-3) stretches upwards, the piston rod of two hydraulic cylinders is corresponding with the loading workplace (2-4-2) at auxiliary clamp (2-4) two ends, left and right respectively.
4. blade of wind-driven generator Torsion Coupling vector measurement device according to claim 3, is characterized in that, clamping chamber (2-4-3) inwall of described auxiliary clamp (2-4) arranges rubber blanket (2-4-4).
5. blade of wind-driven generator Torsion Coupling vector measurement device according to claim 4, is characterized in that, described first support (2-1) and the second support (2-5) are removable frame.
6. the blade of wind-driven generator Torsion Coupling vector measurement device according to any one of Claims 1 to 5, it is characterized in that, described clamping device (1) comprises grip slipper (1-1), hydraulically operated fixture and the first hydraulic power unit (1-4), described grip slipper (1-1) is fixed on level ground, grip slipper (1-1) arranges blades installation hole (1-1-1), is evenly arranged three cover hydraulically operated fixtures at the periphery of blades installation hole (1-1-1).
7. blade of wind-driven generator Torsion Coupling vector measurement device according to claim 6, it is characterized in that, described hydraulically operated fixture comprises clamping oil cylinder (1-2) and grip block (1-3), described clamping oil cylinder (1-2) is connected with the first hydraulic power unit (1-4), the piston rod of clamping oil cylinder (1-2) and grip block (1-3) are fixed and are assembled, and described grip block (1-3) is provided with the arc clamping face mated with root of blade.
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| CN201510608815.2A CN105181318B (en) | 2015-09-23 | 2015-09-23 | A kind of blade of wind-driven generator Torsion Coupling vector measurement device |
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| CN110057518A (en) * | 2019-05-21 | 2019-07-26 | 山东理工大学 | A kind of loading method and device for rear edge of wind turbine blade component |
| CN113390625A (en) * | 2021-08-17 | 2021-09-14 | 中国航天空气动力技术研究院 | Front edge bending test tool and method |
| CN113446979A (en) * | 2021-07-07 | 2021-09-28 | 山东理工大学 | Accurate measuring device for space angle of steel wire rope and wind power blade in full-size static force loading test of wind power blade |
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| CN113446979A (en) * | 2021-07-07 | 2021-09-28 | 山东理工大学 | Accurate measuring device for space angle of steel wire rope and wind power blade in full-size static force loading test of wind power blade |
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| CN113390625B (en) * | 2021-08-17 | 2021-12-07 | 中国航天空气动力技术研究院 | Front edge bending test tool and method |
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