CN109342047A - Vane stability test method and test fixture - Google Patents
Vane stability test method and test fixture Download PDFInfo
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- CN109342047A CN109342047A CN201811549754.7A CN201811549754A CN109342047A CN 109342047 A CN109342047 A CN 109342047A CN 201811549754 A CN201811549754 A CN 201811549754A CN 109342047 A CN109342047 A CN 109342047A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of vane stability test method and test fixture, which includes: to provide blade sections to be tested, pastes sensing element in the detected part of blade sections；By blade sections along the clamping device that predetermined direction is placed in test fixture, so that blade sections are clamped along the both ends in length direction by clamping device；Start the driving mechanism of test fixture, to drive clamping device to apply extruding force to the detected part of blade sections, wherein one end opposite with detected part that clamping device corresponds to blade sections is provided with shaft；Obtain the data measured by sensing element.The stability test method can verify the rear stability of entire blade by the stability of preparatory pilot blade section, reduce the material cost of production blade, shorten the design cycle of blade, improve the verification efficiency of blade.
Description
Technical field
The present invention relates to technical field of wind power generation, more particularly to a kind of vane stability test method and test work
Dress.
Background technique
The wind-powered electricity generation blade in unit of having an effect generally requires through static test before putting into operation and verifies trailing edge
Stability.As shown in Figure 1, the method for static test usually fixes root one end B1 of blade B in the prior art, blade B
Other end B2 freely place, then the length direction along blade B selects several Hoisting Positions, with crane along Fig. 1 arrow
Shown in direction stretch blade B certain distance, trailing edge regional area A generates compressional deformation because blade B is deformed, can be with answering
Become the strain data that piece measures rear regional area A.Finally the strain data of measurement and theoretical strain data are compared,
To estimate the stability of trailing edge.
But above scheme must make full-scale blade, and only a portion of actual measurement, cost compared with
It is high.In addition, being also capable of measuring other structures parameter although manufacturing full-scale blade and being tested, works as and need to calculate rear in advance
Stability and when being verified, needs to wait the complete stability for measuring rear again of full-scale blade processing, the verification time is too long, shadow
The design cycle of blade is rung.
Summary of the invention
The object of the present invention is to provide a kind of vane stability test method and test fixtures, can be by testing in advance
The stability of blade sections verifies the stability of entire blade.
On the one hand, the embodiment of the invention provides a kind of vane stability test method, which includes:
Blade sections to be tested are provided, paste sensing element in the detected part of blade sections；Blade sections are placed in survey along predetermined direction
In the clamping device of trial work dress, so that blade sections are clamped along the both ends in length direction by clamping device；Start test fixture
Driving mechanism, with drive clamping device to the detected part of blade sections apply extruding force, wherein clamping device correspond to blade
One end opposite with detected part of section is provided with shaft；Obtain the data measured by sensing element.
According to an aspect of an embodiment of the present invention, the detected part of blade sections is trailing edge, and predetermined direction is blade
Section leading edge place downward, the direction that rear is placed upward.
According to an aspect of an embodiment of the present invention, the size of extruding force F meets formula (1):
F=(F0 × L1)/L2 (1)
Wherein, F0 is the driving force of driving mechanism, and L1 is the first distance between the output shaft and shaft of driving mechanism, L2
For the second distance between the detected part and shaft of blade sections.
On the other hand, the embodiment of the invention provides a kind of vane stability test fixture, the stability test tooling packets
It includes: pedestal；Clamping device, including the first column and the second column being oppositely arranged, the first column and the second column are along from height
Degree direction all has opposite first end and second end, and the first end of the first column and the second column can be rotated relative to pedestal；
Driving mechanism is connected between the second end of the first column and the second end of the second column；Wherein, blade sections to be tested are along pre-
Determine direction to be placed between the first column and the second column, so that blade sections are pressed from both sides along the both ends in length direction by clamping device
It holds, clamping device applies extruding force to the detected part of blade sections by driving mechanism.
According to an aspect of an embodiment of the present invention, the detected part of blade sections is the rear of blade, and predetermined direction is leaf
The second end that the leading edge of segment corresponds to the first column and the second column is placed, rear corresponds to the first column and the second column
The direction that first end is placed.
According to an aspect of an embodiment of the present invention, clamping device further includes the first clamping plate being oppositely arranged and the second folder
Plate, first clamping plate are fixedly connected with the first column, and second clamping plate is fixedly connected with the second column, and clamping device passes through first clamping plate
Blade sections are clamped with second clamping plate.
According to an aspect of an embodiment of the present invention, the first through slot, the first through slot and blade sections are provided in first clamping plate
The cross-sectional shape of clamped one end is adapted, and the second through slot is provided in second clamping plate, and the second through slot and blade sections are pressed from both sides
The cross-sectional shape for the other end held is adapted.
According to an aspect of an embodiment of the present invention, clamping device further includes a pair of of fixing seat, a pair of of fixing seat respectively with
The second end of first column is fixedly connected with the second end of the second column；Driving mechanism includes body part interconnected and output
Axis, one of fixing seat are connect with body part, another fixing seat is connected with exporting axis.
According to an aspect of an embodiment of the present invention, pedestal includes pedestal and the fixed frame that is fixedly connected with pedestal, fixed
It is provided with a pair of of shaft on frame, the first end of the first end of the first column and the second column passes through shaft respectively and pedestal pivots and connects
It connects.
According to an aspect of an embodiment of the present invention, fixed frame includes that horizontal positioned the first beam and intersecting with the first beam is set
The second beam of a pair set is provided with shaft on the second beam.
According to an aspect of an embodiment of the present invention, fixed frame further includes third beam, and one end of third beam connects the first beam,
The other end connects the second beam.
According to an aspect of an embodiment of the present invention, driving mechanism is any one of hydraulic cylinder, cylinder and electric pushrod.
A kind of vane stability test method provided in an embodiment of the present invention, by the stability of preparatory pilot blade section come
The stability for verifying entire blade reduces the material cost of production blade, shortens the design cycle of blade, improve blade
Verification efficiency.In addition, a kind of vane stability test fixture provided in an embodiment of the present invention, by by blade sections according to predetermined
Direction is placed in the clamping device of test fixture, and starts driving mechanism and clamping device is driven to apply to the detected part of blade sections
Add extruding force, structure is simple, is easily achieved.
Detailed description of the invention
The feature, advantage and technical effect of exemplary embodiment of the present described below with reference to the accompanying drawings.
Fig. 1 is a kind of schematic diagram of vane stability test method in the prior art；
Fig. 2 is a kind of schematic diagram of vane stability test method provided in an embodiment of the present invention；
Fig. 3 is a kind of flow diagram of vane stability test method shown in Fig. 2；
Fig. 4 is a kind of structural schematic diagram of vane stability test fixture provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the first clamping plate in stability test tooling shown in Fig. 4.
Fig. 6 is the structural schematic diagram that stability test tooling shown in Fig. 4 removes a part of fixed frame；
Fig. 7 is the structural schematic diagram of the stability test tooling shown in the A of direction along Fig. 4.
Wherein,
10- pedestal；11- pedestal；111- fixing groove；12- fixed frame；The first beam of 121-；The second beam of 122-；123- third
Beam；13- shaft；
20- clamping device；The first column of 21-；The second column of 22-；23- first clamping plate；The first through slot of 231-；24- second
Clamping plate；25- fixing seat；A- first end；B- second end；
30- driving mechanism；31- body part；32- output shaft；L1- first distance；L2- second distance；Before F- blade sections
Edge；The rear of R- blade sections.
In the accompanying drawings, identical component uses identical appended drawing reference.The attached drawing is not drawn according to the actual ratio.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation
The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.In attached drawing and following
Description in, at least part of known features and technology are not shown, unnecessary fuzzy to avoid causing the present invention；
Also, for clarity, may be exaggerated the size of part-structure.In addition, feature described below, structure or characteristic can be with
It is incorporated in one or more embodiments in any suitable manner.
The noun of locality of middle appearance described below is direction shown in figure, is not to carry out to specific structure of the invention
It limits.In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " installation ", " even
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it is also possible to detachable connection, or be integrally connected；It can be
It is connected directly, can also be indirectly connected.For the ordinary skill in the art, visual concrete condition understands above-mentioned term
Concrete meaning in the present invention.
For a better understanding of the present invention, vane stability provided in an embodiment of the present invention is surveyed below with reference to Fig. 2 to Fig. 7
Method for testing and test fixture are described in detail.
Referring to Figure 2 together and Fig. 3, the embodiment of the invention provides a kind of vane stability test method, the stability
Test method includes:
Step S1: providing blade sections B to be tested, pastes sensing element T in the detected part of blade sections B.
In order to shorten the design cycle of blade, improve the verification efficiency of blade, it can only make and need to measure in blade surely
That qualitative a part of blade sections B is for testing.Sensing element T can be foil gauge or displacement meter, and foil gauge is for measuring
Detected part is squeezed the strain value after power, and displacement meter is felt for measuring the deformation displacement that detected part is squeezed after power
Element T is surveyed depending on specific testing requirement.
Step S2: by blade sections B along the clamping device 20 that predetermined direction is placed in test fixture, so that the edge blade sections B
The both ends in length direction are clamped by clamping device 20.
Step S3: starting the driving mechanism 30 of test fixture, to drive clamping device 20 to apply to the detected part of blade sections B
Add extruding force F, wherein one end opposite with detected part that clamping device 20 corresponds to blade sections is provided with shaft 13.
Step S4: the data measured by sensing element T are obtained.
Vane stability test method provided in an embodiment of the present invention is tested by the stability of preparatory pilot blade section B
The stability for demonstrate,proving entire blade is not needed to provide entire blade and be tested, and is reduced the material cost of production blade, is shortened
The design cycle of blade improves the verification efficiency of blade.
Since blade is in hoisting process, rear easily generates compressional deformation because of deformable blade, in the application, in order to measure
The stability of entire trailing edge, can measure the stability of the rear R of blade sections B in advance.After the detected part of blade sections B is
Sensing element T is pasted onto the detected part of blade sections B by edge R.Predetermined direction be blade sections B leading edge F downward, rear R upward
The direction of placement.
It is understood that sensing element T can also be pasted onto blade to measure the stability at other positions of blade
Other positions of section B, and the predetermined direction of blade is correspondingly replaced, to measure corresponding data.
Further, driving mechanism 30 drives clamping device 20 to apply extruding force F to the rear R of blade sections B.The extruding force
The size of F can be calculated by lever principle.As shown in figure 3, the size of extruding force F meets formula (1):
F=(F0 × L1)/L2 (1)
Wherein, F0 be driving mechanism 30 output shaft driving force, L1 be driving mechanism 30 output shaft and shaft 13 it
Between first distance, L2 be blade sections B detected part and shaft 13 between second distance.When detected part is rear R, L2
For the second distance between the rear R and shaft 13 of blade sections B.
The specific structure of the test fixture used in above-mentioned vane stability test method is described in detail with reference to the accompanying drawing.
Refering to Fig. 4, a kind of vane stability test fixture provided in an embodiment of the present invention, the stability test tooling packet
It includes: pedestal 10, clamping device 20 and driving mechanism 30.
Clamping device 20 includes the first column 21 and the second column 22 being oppositely arranged, the first column 21 and the second column 22
Opposite first end a and second end b, the first end a phase of the first column 21 and the second column 22 are all had along oneself height direction
Pedestal 10 can be rotated.
Driving mechanism 30 is connected between the second end b of the first column 21 and the second end b of the second column 22, wherein to
The blade sections B of test is placed between the first column 21 and the second column 22 along predetermined direction, so that blade sections B is along length
The both ends in direction are clamped by clamping device 20.Clamping device 20, which is applied by driving mechanism 30 to the detected part of blade sections, to be squeezed
Power.
The stability test tooling of trailing edge provided in an embodiment of the present invention, by by blade sections B according to predetermined direction
It is placed in the clamping device 20 of test fixture, and starts driving mechanism 30 and drive to be measured portion of the clamping device 20 to blade sections B
Position applies extruding force, and structure is simple, is easily achieved.
In the application, in order to measure the stability of entire trailing edge, the steady of the rear R of blade sections B can be measured in advance
It is qualitative.I.e. the detected part of blade sections B is the rear R of blade, and the leading edge F that predetermined direction is blade sections B is corresponding to the first column
21 and second column 22 second end b place, rear R corresponds to what the first end a of the first column 21 and the second column 22 was placed
Direction.
It is understood that sensing element T can also be pasted onto blade to measure the stability at other positions of blade
Other positions of section B, and the predetermined direction of blade is correspondingly replaced, to measure corresponding data.
Further, clamping device 20 further includes the first clamping plate 23 and second clamping plate 24 being oppositely arranged, first clamping plate 23
It is fixedly connected with the first column 21, second clamping plate 24 is fixedly connected with the second column 22, and clamping device 20 passes through first clamping plate 23
Blade sections B is clamped with second clamping plate 24.
First clamping plate 23 and second clamping plate 24 scratch or destroy blade sections B in order to prevent, can use wooden materials system
Make first clamping plate 23 and second clamping plate 24, to reduce the frictional force between first clamping plate 23 and second clamping plate 24 and blade sections B.
Specifically, refering to Fig. 5, blade sections B is rotated relative to first clamping plate 23 and second clamping plate 24 in order to prevent, the first folder
The first through slot 231 is provided on plate 23, the first through slot 231 is adapted with the cross-sectional shape of the one end being clamped blade sections B, the
The second through slot (not shown), the cross section for the other end that the second through slot and blade sections B are clamped are provided on second splint 24
Shape is adapted.By taking first clamping plate 23 as an example, the P1 point of the first through slot 231 corresponds to corresponding to rear R, the P2 point of blade sections B
The leading edge F of blade sections B.When the cross-sectional shape at the both ends that blade sections B is clamped is identical, the first through slot 231 and the second through slot
Shape be in mirror settings.When the cross-sectional shape difference at the both ends that blade sections B is clamped, the first through slot 231 and second is logical
The shape of slot is similar and is in mirror settings.
Blade sections B passes through the first through slot 231 of first clamping plate 23, the edge blade sections B along the one end in length direction as a result,
The other end in length direction passes through the second through slot of second clamping plate 24, and is held in the first column 21 and the second column 22
Between.
Since the cross-sectional shape at the both ends being clamped blade sections B is complicated curve, when the thickness of blade sections B is thicker
When, it is difficult to ensure that the machining accuracy of the first through slot 231 and the second through slot.For the ease of processing, first clamping plate 23 and second clamping plate
24 can be disposed as multi-layered sheet composite construction.
In addition, clamping device 20 further includes a pair of of fixing seat 25, a pair of of fixing seat 25 respectively with the first column 21 second
The second end b of end b and the second column 22 is fixedly connected；Driving mechanism 30 includes body part 31 interconnected and output shaft 32,
One of fixing seat 25 is connect with body part 31, another fixing seat 25 is connect with output shaft 32.It is defeated when driving mechanism 30
When shaft shortens, the second end b of the first column 21 and the second column 22 can be driven to pivot around respective first end a and inwardly leaned on
Hold together, so that first clamping plate 23 and second clamping plate 24 squeeze blade sections B along the both ends in length direction, thus blade sections B respectively
Rear R be squeezed and deform.
Referring to Figure 6 together and Fig. 7, pedestal 10 include pedestal 11 and the fixed frame 12 being fixedly connected with pedestal 11, fix
It is provided with a pair of of shaft 13 on frame 12, the first end a of the first column 21 and the second column 22 passes through shaft 13 and pedestal 10 respectively
It is pivotally connected.Specifically, the first end a of the first column 21 and the second column 22 is respectively arranged with through the hole of shaft 13, and first
The first end a of column 21 and the second column 22 is pivotally connected with pedestal 10 by hole axle cooperation.
According to aforementioned vane stability test method, driving mechanism 30 drives clamping device 20 to apply to the rear R of blade sections B
Add extruding force F.The size of extruding force F can be calculated by lever principle, as shown in fig. 7, the size of extruding force F meets
Formula (1):
F=(F0 × L1)/L2 (1)
Wherein, F0 is the driving force of the output shaft 32 of driving mechanism 30, and L1 is the output shaft 32 and shaft of driving mechanism 30
First distance between 13, L2 are the second distance between the rear R and shaft 13 of blade sections B.
Driving mechanism 30 can be any one of hydraulic cylinder, cylinder and electric pushrod.It is hydraulic cylinder with driving mechanism 30
For, hydraulic cylinder is connect with hydraulic power unit (not shown), starts hydraulic pump, and the size by controlling oil pressure controls hydraulic cylinder
Power output size, can also by manually control oil pressure size control hydraulic cylinder power output size, to make hydraulic
Cylinder makes the rear R of blade sections B be squeezed and deform to contract.
Fixed frame 12 includes the first horizontal positioned beam 121 and intersects the second beam of a pair 122 being arranged with the first beam 121,
Shaft 13 is provided on second beam 122.Preferably, the second beam 122 is arranged perpendicular to the first beam 121, to improve fixed frame 12
Support force.
Further, fixed frame 12 further includes third beam 123, and one end of third beam 123 connects the first beam 121, the other end
Connect the second beam 122.Third beam 123 is plate-like piece, and the first beam 121, the second beam 122 and third beam 123 form stable triangle
Shape structure further increases the support force of fixed frame 12, and 13 moving influence of shaft is prevented to be applied on the rear R of blade sections B
Extruding force size.
In addition, be provided with fixing groove 111 on pedestal 11, fixed frame 12 by the fastener that is placed in fixing groove 111 with
Pedestal 11 is fixedly connected.Fixing groove 111 can be the inverted T-slot that extends along first direction X, and the first beam 121 is along with first
Direction X intersection second direction Y be layed on pedestal 11, as shown in fig. 6, and the first beam 121 be provided with and inverted T-slot
Corresponding through-hole, fastener can be foundation bolt, and the nut of foundation bolt is placed in inverted T-slot, by nut with
First beam 121 is fixed together by the cooperation of fastener with pedestal 11.Foundation bolt can prevent fixed frame 12 on the base 11
It is mobile.Fixed frame 12 can also be fixed on by welding on pedestal 11, be repeated no more.
In order to mitigate the weight of stability test tooling, and the rigidity of stability test tooling is improved, clamping device 20
First column 21, the second column 22, pedestal 10 fixed frame 12 can be used I-steel setting, meeting the same of structural strength
When, guarantee economy to greatest extent.I-steel can also be replaced using the steel in other type faces.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as there is no structures to rush
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited to texts
Disclosed in specific embodiment, but include all technical solutions falling within the scope of the claims.
Claims (12)
1. a kind of vane stability test method, which is characterized in that the stability test method includes:
Blade sections to be tested (B) is provided, pastes sensing element (T) in the detected part of the blade sections (B)；
By the blade sections (B) along the clamping device (20) that predetermined direction is placed in test fixture, so that the blade sections (B)
Both ends along length direction are clamped by the clamping device (20)；
Start the driving mechanism (30) of the test fixture, to drive the clamping device (20) to the institute of the blade sections (B)
State detected part apply extruding force F, wherein the clamping device (20) correspond to the blade sections with the detected part phase
Pair one end be provided with shaft (13)；
Obtain the data measured by the sensing element (T).
2. stability test method according to claim 1, which is characterized in that the portion to be measured of the blade sections (B)
Position is rear (R), and the predetermined direction is that the leading edge (F) of the blade sections (B) is placed downward, the rear (R) is placed upward
Direction.
3. stability test method according to claim 1 or 2, which is characterized in that the size of the extruding force F meets formula
(1):
F=(F0 × L1)/L2 (1)
Wherein, F0 is the driving force of the output shaft of the driving mechanism, output shaft and the shaft of the L1 for the driving mechanism
(13) first distance between, L2 be the blade sections (B) the detected part and the shaft (13) between second away from
From.
4. a kind of vane stability test fixture, which is characterized in that the stability test tooling includes:
Pedestal (10)；
Clamping device (20), including the first column (21) and the second column (22) being oppositely arranged, first column (21) and
Second column (22) all has opposite first end (a) and second end (b), first column along oneself height direction
(21) it can be rotated with the first end (a) of second column (22) relative to the pedestal (10)；
Driving mechanism (30) is connected to the second end (b) of first column (21) and the institute of second column (22)
It states between second end (b)；
Wherein, blade sections to be tested (B) are placed in first column (21) and second column (22) along predetermined direction
Between, so that the blade sections (B) are clamped along the both ends in length direction by the clamping device (20), the clamping device
(20) extruding force is applied to the detected part of the blade sections (B) by the driving mechanism (30).
5. stability test tooling according to claim 4, which is characterized in that the portion to be measured of the blade sections (B)
Position is the rear (R) of blade, and the predetermined direction is that the leading edge (F) of the blade sections (B) corresponds to first column (21)
It is placed with the second end (b) of second column (22), rear (R) corresponds to first column (21) and described second
The direction that the first end (a) of column (22) is placed.
6. stability test tooling according to claim 4, which is characterized in that the clamping device (20) further includes opposite
The first clamping plate (23) and second clamping plate (24) of setting, the first clamping plate (23) are fixedly connected with first column (21),
The second clamping plate (24) is fixedly connected with second column (22), and the clamping device (20) passes through the first clamping plate
(23) and the second clamping plate (24) clamps the blade sections.
7. stability test tooling according to claim 6, which is characterized in that be provided on the first clamping plate (23)
The cross-sectional shape of one through slot (231), first through slot (231) one end clamped with the blade sections (B) is adapted, institute
It states and is provided with the second through slot on second clamping plate (24), the cross of second through slot and the blade sections (B) the clamped other end
Cross sectional shape is adapted.
8. stability test tooling according to claim 4, which is characterized in that the clamping device (20) further includes a pair
Fixing seat (25), the pair of fixing seat (25) second end (b) and described second with first column (21) respectively
The second end (b) of column (22) is fixedly connected；
The driving mechanism (30) includes body part interconnected (31) and output shaft (32), one of them described fixing seat
(25) it is connect with the body part (31), another described fixing seat (25) connect with the output shaft (32).
9. stability test tooling according to claim 4, which is characterized in that the pedestal (10) include pedestal (11) and
The fixed frame (12) being fixedly connected with the pedestal (11) is provided with a pair of of shaft (13) on the fixed frame (12), described
The first end (a) of one column (21) and second column (22) passes through the shaft (13) and the pedestal (10) respectively
It is pivotally connected.
10. stability test tooling according to claim 9, which is characterized in that the fixed frame (12) is put including level
The first beam (121) for setting and the second beam of a pair (122) for intersecting setting with first beam (121), on second beam (122)
It is provided with the shaft (13).
11. stability test tooling according to claim 10, which is characterized in that the fixed frame (12) further includes third
Beam (123), one end of the third beam (123) connect first beam (121), and the other end connects second beam (122).
12. stability test tooling according to claim 4, which is characterized in that the driving mechanism (30) be hydraulic cylinder,
Any one of cylinder and electric pushrod.
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| CN201811549754.7A CN109342047A (en) | 2018-12-18 | 2018-12-18 | Vane stability test method and test fixture |
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| CN201811549754.7A CN109342047A (en) | 2018-12-18 | 2018-12-18 | Vane stability test method and test fixture |
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| CN203824722U (en) * | 2012-12-05 | 2014-09-10 | 工业设备运营公司 | Rotor-blade test board and device therewith |
| CN203551403U (en) * | 2013-10-18 | 2014-04-16 | 珠海格力电器股份有限公司 | Universal testing device for bending fatigue performance |
| CN103698111A (en) * | 2013-11-22 | 2014-04-02 | 宁波拓普集团股份有限公司 | Linear and torsional fatigue test fixture for pipe bush |
| CN105092191A (en) * | 2014-05-07 | 2015-11-25 | 哈尔滨飞机工业集团有限责任公司 | Helicopter composite material propeller fatigue test system and method |
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| WO2017140918A1 (en) * | 2016-02-18 | 2017-08-24 | Nabrawind Technologies SL | Test bench and method of use |
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