CN101949770B - Identifying and testing system of static force of blades of wind driven generator - Google Patents
Identifying and testing system of static force of blades of wind driven generator Download PDFInfo
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- CN101949770B CN101949770B CN2010102551617A CN201010255161A CN101949770B CN 101949770 B CN101949770 B CN 101949770B CN 2010102551617 A CN2010102551617 A CN 2010102551617A CN 201010255161 A CN201010255161 A CN 201010255161A CN 101949770 B CN101949770 B CN 101949770B
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Abstract
The invention discloses an identifying and testing system of static force of blades of a wind driven generator, which mainly comprises a signal detecting element and a signal processing device, wherein the signal detecting element comprises a force measuring sensor and a strain gage with temperature self-compensation, the signal processing device is provided with a shunt calibrating module capable of re-calibrating the sensitivity of the strain gage, a remote detecting module capable of compensating the line loss of working voltage of a force measuring sensor bridge by the internal resistance of a signal cable of a force measuring sensor, a load-leveling and strain-zero clearing module capable of automatically zero-clearing a load initial value and a strain initial value generated when the blades are leveled, and a high-speed synchronous data acquiring card capable of synchronously acquiring and keeping an output signal of the signal detecting element.
Description
Technical field:
The present invention relates to blade of wind-driven generator, be specifically related to this blade static(al) certification test test macro, belong to technical field of measurement and test.
Background technology:
The wind wheel blade of wind power generating set is one of critical component of aerogenerator, and the quality of blade directly influences efficient, life-span and the performance of wind power generating set.And the development of blade, produce and to relate to a plurality of subjects, be multi-disciplinary high-tech product.Because domestic shortage is made the technical foundation of large fan blade, so before " 95 ", the almost whole dependence on import of the wind power generation blade of China.Along with the introduction and the digestion of wind electricity blade technology, China also begins autonomous Design and the commercialization of producing the megawatt wind-power blade wind electricity blade, but the commercialization of wind electricity blade must obtain the authentication of corresponding international organization.And the static(al) authentication of wind electricity blade is one of requisite authentication item of wind electricity blade authentication.At present, the blade of domestic design mainly need be through the authentication of German GL (classification society) or CCS or the on-the-spot slow test of China's mirror weighing apparatus.The purpose of its authentication is:
◆ confirm the actual rigidity in each cross section of blade;
◆ under 110% ultimate load, confirm the residual intensity grade of blade construction;
◆ under 110% ultimate load, confirm the stability or the buckling strength of blade construction;
◆ the test data with slow test contrasts design calculation result; The strain at general blade frequencies value that requires to calculate and the responsive place of blade respectively ± 5% and ± 10% scope within; After having only experimental test value and design calculated value to reach within the permissible range; Design and the consistance of making can be assert, the reliability and the feasibility of design can be assert simultaneously.
Slow test mainly comprises following action:
◆ the test wind electricity blade is in first and second rank beam frequency and the dampings of flapwise direction and edgewise direction;
◆ under the step, measure the loaded load value of each loading position of blade and the strain value of blade sensitive spot in 0%-40%-60%-80%-100% test loaded load.
In existing blade static(al) certification test measuring technology, mainly there is following problem:
1. foil gauge does not have temperature self-compensation function, has to increase by 2 times of foil gauges, forms bridge detection circuit and realizes temperature compensation, and not only cost is high, and when dummy gauge and test foil gauge temperature contrast were big, its compensation effect was then relatively poor.
2. because the physical dimension of blade is very big; Its length is often more than 20 meters; So the stube cable between foil gauge, force cell and the proving installation is very long, at least 50 meters, the cable internal impedance is bigger; The bridge WV of detected foil gauge output voltage signal and sensor (force cell is an active sensor) decay is big, and measuring accuracy is low.
3. because the measuring point of strain measuring point and loaded load is a lot, generally be no less than 20 points, can reach more than 70 point at present at most; And in blade slow test process, the residence time of each load step can not be oversize, is at present to test with the static test strainmeter; This instrument is timesharing scanning, causes the signal of each measuring point can not realize synchronous acquisition, and makes that the time of a test period is longer; When the measuring point of blade is a lot; Just can't carry out continuously uninterrupted test, be merely able to write down the test data of each load step, can not real time record static(al) loading procedure in the continuous change procedure of whole blade loaded load and strain; Thereby can not in time find the omen that the blade strain suddenlys change, the serious accident of leaf destruction, hurting people or smashing objects takes place easily.
4. because the influence of blade deadweight and loading anchor clamps before slow test begins, must be carried out leveling to blade; After the blade leveling, strain-type force sensor and foil gauge have just had initial value, and this initial value should be the zero point that actual slow test loads; If can not before the formal static(al) of blade loads, these initial values be made zero, the test value of then whole slow test process has all comprised the initial value after the blade leveling; And real test value should deduct this initial value; For this reason, for several ten thousand test datas, this has obviously increased the workload that test back off-line data is analyzed; A lot of times of loaded down with trivial details calculation cost, make the test period very long.
5. vibration frequency and damping measurement, loaded load and strain measurement use the special-purpose proving installation of two covers to test respectively; With vibration table or hammering method and spectrum analyzer measuring vibrations frequency and damping; With strain-gauge test measurement device loaded load and strain; Make proving installation numerous and diverse, equipment investment is huge; And the step of test is various.
Summary of the invention:
The object of the invention provides reasonable, the advanced practical wind electricity blade static(al) test macro of a design science, can just solve above-mentioned the problems of the prior art effectively, and its technical solution is:
This blade of wind-driven generator static(al) certification test test macro comprises:
-testing table is used for installing and is tried blade;
-test load charger is used for applying slow test load to blade;
-a plurality of strain-type force sensors are arranged in the connection chain of each load(ing) point of blade and test load charger, are used to detect the static(al) value of load(ing) point test load;
-a plurality of foil gauges with temperature self-compensation stick on respectively on each sensitive spot of blade, are used to detect the strain value of blade these sensitive spots under test load;
-bridge-type strain data processor is used to handle the detected loading basic load of all strain-type force sensors value signal data and the detected strain value signal data of all foil gauges, and it comprises following functional module:
The shunting calibration module is used to recalibrate the sensitivity of foil gauge, eliminates the influence of stube cable internal resistance to foil gauge sensitivity; Long-range distance detecting module is used to compensate the line loss of force cell stube cable internal resistance to force cell bridge WV; Leveling load value and the strain value module that makes zero, the load initial value and the strain initial value that are produced when being used for the blade leveling make zero.
-high-speed synchronous data acquiring card is used for the analog signal conversion of foil gauge, force cell output is become digital signal, and high-speed synchronous collection and keep these signal datas, and it is sent into computing machine;
-computer processor is used to handle the voltage signal data of foil gauge output and the voltage signal data of force cell output, and the voltage signal of load and strain is converted to the measured value of reality and measured value is carried out the number percent conversion;
-computer memory is used to store the measuring-signal data of foil gauge output, the measuring-signal data of force cell output;
-display is used to show the measured value of foil gauge output signal after treatment and the measured value of force cell output signal.
Said test load charger is 1 or many truck cranes, and its suspension hook is the load(ing) point of corresponding blade respectively, is fixed with one on each load(ing) point and loads anchor clamps, and each anchor clamps is suspended on the suspension hook of each self-corresponding truck crane through hoist cable.
Said strain-type force sensor is arranged on the tie point between anchor clamps and the hoist cable.
Said foil gauge is to have-20 ℃～40 ℃ self-compensating foil gauges of environment temperature.
Said foil gauge adopts the glue of room temperature fast-curing to stick on the sensitive spot of blade, and the exposed surface after gluing scribbles waterproof and dustproof coating.
Saidly tried that stationary cloth is equipped with a foil gauge joint-box on the blade, the cable of foil gauge connects on the connection terminal in this junction box, connects with bridge-type strain data processor through connectorized cable again.
The technique effect of this test macro:
This test macro can be applied to the test of static(al) certification test of the wind electricity blade of all models; In blade slow test process; The test signal collection and the store operational of 96 TCH test channels can be satisfied, mainly following function can be realized through this cover test macro:
1) blade natural frequency and damping test;
2) realize remote sense (far distance automatic detection) function of force cell automatically, guarantee that the force cell measuring accuracy does not receive the influence of conductor length;
3) realize shunting calibration (shunt calibration) automatically, guarantee that the strain testing data precision does not receive the influence of conductor length;
4) realize the multi-point sampler synchronization of data and keep function (Simultaneous Sample and Hold), strict guarantee multi-point sampler synchronization of data real-time;
5) realize the work of making zero (Offset Null Compensation) of initial testing data automatically, reduced the workload of artificial treatment test data, its principle be utilize digital potentiometer with the output valve of bridge voltage regular be zero;
6) test data of demonstration synchronously in real time and the slow test of storage blade;
7) test data is stored as text ASCII character mode, has both conveniently utilized the printer output data, conveniently utilizes the Excell program to open again, so that carry out the analysis of test data;
Before different wind electricity blade static(al) certification tests, can be according to the title and the test operating mode title of dissimilar blades and operating condition of test change storage file.
In addition, can accomplish the test of vibration frequency and damping measurement, loaded load and two pilot projects of strain measurement with native system, can save vibration frequency and damping test device, practice thrift a large amount of rigs for testing investments, economic effect is highly significant also.
Description of drawings:
Fig. 1 is the formation and the user mode structural drawing (being loaded as example with 3 cranes) of this test macro.
Fig. 2 is the topology diagram of test macro among Fig. 1.
Fig. 3 is the software program structural drawing of this test macro.
Fig. 4 is the process flow diagram (dotted line is the off-line analysis process) of blade frequencies test module.
Fig. 5 is the process flow diagram (dotted line is the off-line analysis process) of blade damping test module.
Fig. 6 is the process flow diagram (dotted line is the off-line analysis process) of blade slow test test.
Fig. 7 is the schematic diagram of the far distance automatic detection of force cell.
Fig. 8 is a schematic diagram of realizing the shunting calibration automatically.
Fig. 9 is that (code name is represented among Fig. 9: the 1-retention time for the schematic diagram of data sync and maintenance; The 2-tracking time; 3-strain bridge-type processor maximum time).
Figure 10 is the structural drawing of wind electricity blade frequency test program.
Figure 11 is the structural drawing of wind electricity blade damping test program.
Figure 12 is the structural drawing (annotating: Figure 12-1, Figure 12-2, Figure 12-3, Figure 12-4, Figure 12-5, Figure 12-the 6th, the whole Figure 12 that links to each other in regular turn) of wind electricity blade slow test test procedure.
Embodiment:
Formation of this test macro and user mode structure are referring to Fig. 1 (being loaded as example with 3 cranes), and it mainly comprises testing table 1, are used for fixing the wind electricity blade 2 of accepting test; Three truck cranes are used for applying loaded load to three loading positions of blade 2, and three of blade load positions and are respectively equipped with anchor clamps; Avoid damage with the protection blade, anchor clamps are suspended on the hook of crane 3 by hoist cable again, when on arm stretches out, links up with, moving; Blade receives pulling force; Be bent upwards distortion, at this moment, strain will take place in each sensitive spot of blade.Force cell 4 is arranged in the connecting portion between hoist cable and the anchor clamps, can detect the value of loaded load like this; 5 of foil gauges are each sensitive spots of pasting blade, can detect strain value.The purpose of test; To detect in 0%-40%-60%-80%-100% test loaded load under the step exactly; The loaded load value of each loading position of blade and the strain value of blade sensitive spot; Through bridge-type strain data processor 6, high-speed synchronous capture card 7 and computing machine 8 on-line data acquisitions, processing and later stage off-line analysis, compare with the setting of standard, thereby judge whether blade is qualified.
Because the wind electricity blade size is big (length is generally all above 20m); Therefore; The glue of pasting foil gauge 5 should adopt the glue of room temperature fast-curing, like T-1 type 502 quick setting cements, when surrounding environment is relatively moister; Also should adopt the adhesive surface of hair dryer, guarantee the reliability that its foil gauge 5 is pasted foil gauge; In addition owing to how all slow test projects of blade carry out under the environment in the open; Therefore; Need to adopt the waterproof and the dust-proof material (like the waterproof of foil gauge, moistureproof glue special and water-proof putty) of specialty that foil gauge is protected, fully guarantee the reliability of foil gauge in process of the test.
Solving foil gauge 5 issues of temperature compensation is one of gordian techniquies of the present invention; The material model that the present invention at first adopts according to blade; Test its linear expansion coefficient; According to the scope of the environment temperature-20 of the linear expansion coefficient of blade material and blade slow test ℃～40 ℃ of definite foil gauge temperature self-compensations, recommit the processing of professional production manufacturer then, produce the foil gauge that satisfies above-mentioned performance index.The advantage that foil gauge has temperature self-compensation is not adopt other increase dummy gauge to eliminate the influence of open-air atmosphere temperature variation to the strain measuring accuracy, has also reduced the spending (like foil gauge and lead etc.) of test material cost and has simplified test macro simultaneously.
For fully guaranteeing authenticity, the reliability of test data in the slow test; Test macro of the present invention has been done significant improvement; The topological structure of test macro is referring to Fig. 2, and mainly by bridge-type strain data processor 6, high-speed synchronous data acquiring card 7, computing machine 8, display 9 are formed.Wherein, the test procedure that the is contained in computing machine 8 long-range distance detecting module 6.1 of control bridge-type strain data processor 6, shunting calibration module 6.2, leveling load and strain value functional module 6.3 that makes zero automatically in whole test process; The synchronous acquisition of high-speed synchronous data acquiring card 7 and maintenance module and computer processor 8.1 and storer 8.2.
This part is an emphasis of the present invention, comprises a plurality of inventive points, specifies as follows respectively:
◆ bridge-type strain data processor 6, comprising:
● long-range distance detecting module 6.1
In the slow test process, the force cell of pilot blade loaded load (strain-type force sensor 4) is contained in the truck crane hook and loads between the anchor clamps, considers the distortion of blade and the concrete condition of testing table position; The test lead of its force cell often can not be less than 50 meters; The interior resistance meeting attenuation test instrument of test lead directly causes changing of force cell measurement sensitivity, thereby makes force cell can not truly reflect the actual loaded load of blade slow test process to the bridge voltage of the power supply of load transducer like this; For this reason; Common force cell has been carried out certain modification, increased the function of testing sensor actual power bridge voltage value, and then utilized the LabView program means; Increased Remote Sense (far distance automatic detection) function; Be used to compensate the decay of long lead, guarantee the actual power voltage of force cell, make force cell can accurately reflect the actual loaded load of truck crane blade to supply voltage.The principle of this module is referring to Fig. 7.
● shunting calibration module 6.2
The test lead of same foil gauge also is very long; The resistance of lead also can directly influence the sensitivity of foil gauge, therefore, and in test procedure; Adopted shunting calibration (shunt calibration) function; It can the calibration testing lead actual resistance to the influence of foil gauge sensitivity, guarantee that fully foil gauge can reflect the actual strain value in the blade slow test process, the principle of this module is referring to Fig. 8.
● leveling load and the strain value module 6.3 that makes zero.
Because the influence of factors such as blade deadweight and loading clamp weight before static(al) loads, need be carried out the leveling work of blade; After the blade leveling, force cell and foil gauge have all had the initial value (output of the force cell of this moment just is the load value of blade leveling) that is produced after the blade leveling, if can not be before the formal static(al) of blade loads; These initial values are made zero; The test value of then whole slow test process has all comprised the initial value after the blade leveling, and real test value should deduct this initial value, for this reason; For several ten thousand test datas, this has obviously increased the workload that test back off-line data is analyzed.Yet this test macro then can be realized make zero (the Offset NullCompensation) of initial testing data automatically, has guaranteed that all test datas are the actual value that the blade static(al) loads, and reduces the workload of test data analyzer and arrangement from now on.
Several functions of above-mentioned bridge-type strained device 6 are controlled automatically bridge-type strained device 6 through the software based on the Labview establishment fully and are realized that the software program structure is referring to Fig. 3.
◆ high-speed synchronous data acquiring card 7, this jig are equipped with synchronous data sampling and keep function.
In whole blade static(al) record process, its test macro had both comprised the test of force cell, also comprised strain testing; The quantity of its measuring point even reaches more than 70 measuring point often more than 20 multiple spots, and when loaded load when maximum test load 60% is above; The time that blade stops can not be long, and then can because of the timesharing scanning of static strain tester cause each measuring point can not realize synchronous acquisition as also adopting traditional static test strainmeter to test this moment; And in can not real time record static(al) loading procedure, the continuous change procedure of whole blade loaded load and strain be merely able to write down the test data of each load step; This test macro has then utilized the synchronized sampling that capture card possessed and has kept function (Simultaneous Sample and Hold) to carry out continuous sampling; Not only guarantee the synchronous acquisition of all TCH test channels, and guaranteed the continuity of test data in the loading procedure, convenient when test goes wrong; In time analyze test and the loading data of writing down; Find out the reason that test is broken down, the omen of discovery accident in time avoids taking place serious accident.Simultaneously, the sampling number of its each passage only receives the control of collection plate sampling parameter, therefore, in test can be at 0.0002 second interval in addition the lower SI carry out test data synchronously and continuous acquisition, the principle of this card is referring to Fig. 9.
In addition, owing to the blade slow test often need load respectively in several directions, therefore; After the slow test of accomplishing a direction loading; Then need blade be stood up the another one direction and carry out the static(al) load test, if this moment, all foil gauge test cables were not fixed, then these scattered test cables will stand up to blade and bring great difficulty; And before carrying out the slow test of another one direction, also need carry out taking out stitches and wiring work of instrument test cable again.In this test macro; On near the blade root of blade, fixed a foil gauge joint-box; The cable of foil gauge connects on the connection terminal in this junction box; Connect with bridge-type strain data processor through connectorized cable again; All foil gauge test cables all get into and are fixed in this case, stand up when carrying out the slow test of another one direction again at blade, and the private cable that only needs to connect testing tool and be fixed on the strain joint-box on the blade takes down and inserts and gets final product.
Introduce the course of work of native system below.
With native system fan blade is carried out the static(al) certification test; Be under the blade free state and exist and not influence under the situation of blade natural frequency additional mass; The natural frequency of blade is confirmed in test, utilizes the blade decay waveform of record to calculate each rank modal damping of blade simultaneously; And in the slow test process; Real-time synchronous acquisition; Show and the load of storage loading and the strain testing data at blade sensitive spot place; After accomplishing, slow test can carry out the follow-up test data processing with the data file that Microsoft Excel program is easy to open in the test to be stored; And can conveniently carry out the printout of test data, and be beneficial to the analysis of test figure, finally judge the desired content of whether Pass Test standard of blade slow test process with handling through the test data analyzer of real-time data presented and off-line.
For the slow test of each novel wind power blade, at first should carry out the natural frequency of blade and the test of damping respectively, carry out the static slow test that loads of blade at last.
At first need confirm in the blade slow test in the test preparatory stage; The quantity of its strain sensitive point and position; And in the workshop, the required test foil gauge of blade slow test is sticked on corresponding position; And carry out corresponding waterproof and handle with dustproof, simultaneously the access of foil gauge test cable is fixed in the strain joint-box on the blade root, it is on-the-spot then blade to be transported to open-air blade slow test.
Blade natural frequency test process is referring to Fig. 4.
According to the requirement of test specification, the blade root of blade is fixed on the testing table position, then be in free state after the blade installation; After with polycore cable the strain joint-box being connected with testing apparatus, apply a resonance exciting force to blade, move blade natural frequency test procedure on computers with resonant method; After getting into test procedure master interface; Strained channel, SF, the sampling cutoff frequency of natural frequency test are set, initialization module and the setting of foil gauge parameter and the work such as sampled data storage file name and address of testing apparatus are set simultaneously, after the completion after the above-mentioned work; The test procedure of operation pilot blade natural frequency; The ratio juris of utilization resonance subsequently motivates the blade natural frequency, and then program will be carried out the staking-out work of making zero of foil gauge and sensitivity according to Fig. 7 operational scheme, and accomplishes the synchronous and tracking function of multi-channel sampling test; The data of final test are divided into two-way; One the tunnel gets into the spectrogram that FFT (Fourier) calculated and demonstrated in real time the blade natural frequency, and other one tunnel test data of all TCH test channels of real-time storage then has been equipped with the natural frequency of off-line analysis blade from now on.The spectrogram of frequency test then can save as the figure of bmp form, the accompanying drawing of convenient intuitive analysis from now on and test report.The program structure of natural frequency test is referring to Figure 10.
Blade damping test process is referring to Fig. 5.
After finishing the test of blade natural frequency; Close blade natural frequency test procedure, blade is applied an exciting force, operation blade damping test program with resonant method; Setting at the main interface of program is the same with blade natural frequency test procedure; After accomplishing the setting up and move test procedure, then testing apparatus will write down the decay waveform that vibrates under the blade natural frequency automatically, and accomplish the storage of decaying wave graphic data simultaneously; At this moment; Can obtain the strain value of blade vibration decay each crest of waveform or trough according to the function that the program peak value detects, and then utilize vibration principle to calculate the modal damping value under the natural frequency of the every rank of blade, simultaneously; Also can utilize the wave file program of reading or the Microsoft Excel program of off-line to read the vibration damping waveform that is stored in the data file and do further analysis again and handle, guarantee the accuracy of the modal damping value of blade.The program structure of damping test is referring to Figure 11.
The static test process that loads of blade is referring to Fig. 6.
After accomplishing the natural frequency and damping test of blade; According to the test specification of concrete blade confirm the needed loading of blade count dispose corresponding automobile cape number and on blade loading position install to load anchor clamps; As shown in Figure 1 then be 3 truck cranes slow test loads to blade simultaneously, this test macro can be provided with the test of the slow test that realizes that 1 or many truck cranes load blade simultaneously through parameter.Before static load test; Need lifting rope and force cell be installed on the anchor clamps corresponding the loading; And utilize lifting rope that their hooks with corresponding truck crane are connected, treat that above-mentioned work is accomplished after, at first should command all truck cranes to unload; Guarantee that all load(ing) points do not have loading on blade; Make blade be in free state, the static static(al) test procedure that loads of operation secondly, and the test parameter of passage, strain and the force transducer tested in the main layout setting strain testing of program and loaded load and the conductor resistance of test cable etc.; And accomplish sampling number and the loaded load of the parameter setting of the cutoff frequency of sampling and the leveling of input blade; And test data storage file name and address setting, test procedure that then just can the commencement of commercial operation slow test, test procedure carry out initialization to test module respectively according to the program structure of Fig. 6 and demarcate, and will set tunnel assignment be the TCH test channel of reality; Then all passages are carried out the initial value processing of making zero; And do foil gauge sensitivity and demarcate and regularly carry out the long-range apart from monitoring of force cell, eliminating of the influence of test cable length, and then all passages are carried out the initial value processing of making zero to measuring accuracy; Be the function of all TCH test channel affix synchronized samplings and maintenance simultaneously; Accomplish the caching process of test data collection at last, then testing crew just can carry out the leveling work of blade according to the real-time indicator gauge commander of loaded load truck crane, after the leveling work of completion blade; The static state that need in program, import each measuring point loads the maximum load load of slow test and the calculating strain value of corresponding each measuring point; And select the blade leveling to accomplish button, and then program is with the load value and the strain value automatic clear that automatically the blade leveling will be produced, and the then static slow test that loads then can formally be carried out; All test datas are divided into two-way: the one tunnel is used for real-time demonstration; Whether so that all truck cranes of testing crew control are in the harmony loading process of slow test, and can normally carry out with the slow test of strain value real-time judge according to being presented on the program interface loaded load in real time, other drive test examination data then also are stored in the set storage file according to set sampling number in real time continuously.The file that is stored in data can utilize Microsoft Excel program to open, and conveniently carries out loading procedure figure and data processing.The static program structure that loads test is referring to Figure 12 (being that Figure 12-1 is to Figure 12-6).
Above Figure 10, Figure 11, Figure 12 explanation:
Figure 10 is the structural drawing of wind electricity blade frequency test program, and test procedure is worked out based on Labview;
Figure 11 is the structural drawing of wind electricity blade damping test program, and test procedure is worked out based on Labview;
Figure 12 is the structural drawing of wind electricity blade slow test test procedure, and test procedure is worked out based on Labview.
Claims (6)
1. a blade of wind-driven generator static(al) certification test test macro comprises
-testing table is used for installing and is tried blade;
-test load charger is used for applying slow test load to blade;
-a plurality of strain-type force sensors are arranged in the connection chain of each load(ing) point of blade and test load charger, are used to detect the static(al) value of load(ing) point test load;
-a plurality of foil gauges with temperature self-compensation stick on respectively on each sensitive spot of blade, are used to detect the strain value of blade these sensitive spots under test load;
-bridge-type strain data processor is used to handle the detected loading basic load of all strain-type force sensors value signal data and the detected strain value signal data of all foil gauges, and it comprises following functional module:
The shunting calibration module is used to recalibrate the sensitivity of foil gauge, eliminates the influence of stube cable internal resistance to foil gauge sensitivity; Long-range distance detecting module is used to compensate the line loss of force cell stube cable internal resistance to force cell bridge WV; Leveling load value and the strain value module that makes zero, the load initial value and the strain initial value that are produced when being used for the blade leveling make zero;
-high-speed synchronous data acquiring card is used for the analog signal conversion of foil gauge, force cell output is become digital signal, and high-speed synchronous collection and keep these signal datas, and it is sent into computing machine;
-computer processor is used to handle the voltage signal data of foil gauge output and the voltage signal data of force cell output, and the voltage signal of load and strain is converted to the measured value of reality and measured value is carried out the number percent conversion;
-computer memory is used to store the measuring-signal data of foil gauge output, the measuring-signal data of force cell output;
-display is used to show the measured value of foil gauge output signal after treatment and the measured value of force cell output signal.
2. blade of wind-driven generator static(al) certification test test macro according to claim 1; It is characterized in that: said test load charger is 1 or many truck cranes; Its suspension hook is the load(ing) point of corresponding blade respectively; Be fixed with one on each load(ing) point and load anchor clamps, each anchor clamps is suspended on the suspension hook of each self-corresponding truck crane through hoist cable.
3. blade of wind-driven generator static(al) certification test test macro according to claim 2, it is characterized in that: said strain-type force sensor is arranged on the tie point between anchor clamps and the hoist cable.
4. blade of wind-driven generator static(al) certification test test macro according to claim 1 is characterized in that: said foil gauge is to have-20 ℃～40 ℃ self-compensating foil gauges of environment temperature.
5. blade of wind-driven generator static(al) certification test test macro according to claim 1 is characterized in that: said foil gauge adopts the glue of room temperature fast-curing to stick on the sensitive spot of blade, and the exposed surface after gluing scribbles waterproof and dustproof coating.
6. blade of wind-driven generator static(al) certification test test macro according to claim 1; It is characterized in that: saidly tried that stationary cloth is equipped with a foil gauge joint-box on the blade; The cable of foil gauge connects on the connection terminal in this junction box, connects with bridge-type strain data processor through connectorized cable again.
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| CN102607831B (en) * | 2012-02-25 | 2014-06-04 | 中国科学院工程热物理研究所 | Evaluation method for fatigue damage and service life of horizontal axis wind turbine blade |
| CN103472741B (en) * | 2013-08-29 | 2016-09-14 | 东方电气风电有限公司 | Blade of wind-driven generator fatigue certification test test control system |
| CN104155092B (en) * | 2014-08-16 | 2017-05-24 | 中国科学院工程热物理研究所 | Wind turbine blade static analysis method |
| CN104483119B (en) * | 2014-12-15 | 2018-03-02 | 中国飞机强度研究所 | A kind of method for obtaining engine rotor blade vibration stress |
| CN105784274A (en) * | 2014-12-16 | 2016-07-20 | 中材科技风电叶片股份有限公司 | Large-sized vane static test system |
| CN107014586B (en) * | 2017-04-26 | 2019-09-27 | 哈尔滨工程大学 | Intelligence is with ship seaworthiness instrument |
| CN112327212B (en) * | 2020-10-28 | 2023-03-10 | 北京强度环境研究所 | Real-time broken line detection method of multi-channel loading system based on shunt calibration |
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| CN101634604A (en) * | 2009-09-07 | 2010-01-27 | 中国人民解放军国防科学技术大学 | Static strength test method of large vane used for wind power and electrical power and test system thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101634604A (en) * | 2009-09-07 | 2010-01-27 | 中国人民解放军国防科学技术大学 | Static strength test method of large vane used for wind power and electrical power and test system thereof |
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Address after: 618000 2 Huashan South Road, Deyang, Sichuan, 2 Patentee after: Dongfang Electric Wind Power Co.,Ltd. Address before: 618000 2 Huashan South Road, Deyang, Sichuan, 2 Patentee before: DONGFANG ELECTRIC WIND POWER Co.,Ltd. |