CN103994032B - A kind of remotely monitoring wind electricity blade interlayer structure damage method - Google Patents
A kind of remotely monitoring wind electricity blade interlayer structure damage method Download PDFInfo
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- CN103994032B CN103994032B CN201410243931.4A CN201410243931A CN103994032B CN 103994032 B CN103994032 B CN 103994032B CN 201410243931 A CN201410243931 A CN 201410243931A CN 103994032 B CN103994032 B CN 103994032B
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Abstract
A kind of remotely monitoring wind electricity blade interlayer structure damage method, monitors for wind electricity blade interlayer structure damage position and degree.The present invention utilizes functional characteristic and the distinctive form-dependent character of composite of Intelligent carbon fiber layer (6), it is routed under wind electricity blade (1) exterior skin spar cap (2) above with trailing edge beam (3) under exterior skin above, Intelligent carbon fiber layer (6) and by geodesic structure between set up a sensitivity field, Intelligent carbon fiber layer (6) will be the electric field being prone to detection by the force field transform of geodesic structure, in conjunction with ERT chromatographic imaging system (10), it is distributed by the resistivity of sensitivity field and would know that tested structural stress, the situation of strain, thus can determine whether position and the order of severity that damage is occurred by geodesic structure.Wind electricity blade (1) use process can be monitored by the present invention at a distance in real time, is not required to lay down blade, it is not required that shuts down normal work affect wind-driven generator, can understand wind electricity blade (1) inside configuration cracks can spread situation in real time so that timely early warning.
Description
Technical field
The invention belongs to structure technical field of nondestructive testing, relate generally to a kind of remotely monitoring wind electricity blade interlayer structure damage method.
Background technology
It is known that, the Main Means that product structure part carries out Non-Destructive Testing employing up to now has Ultrasonic Nondestructive, X-ray machine, gamma ray machine, magnetic powder flaw detector etc., also has a kind of method at inside configuration implantation sensing material to detect product surface and internal structure.But for large-scale composite material goods this to wind electricity blade, in above-mentioned detection means, only Ultrasonic Nondestructive method is applicable to the detection of wind electricity blade, use portable supersonic fast scanner examinations, but having a premise is must to carry out before wind electricity blade does not installs on wind-driven generator.And cannot be carried out remote monitoring.Wind electricity blade damage monitoring proposed in Application No.: 201210205204.X " wind electricity blade damage monitoring alignment system based on wireless sound emission sensor network " Patent Application Publication and alignment system, construct and a set of be applied to the sensitive damage monitoring of wind electricity blade crackle perception and alignment system.Wireless sound emission sensor node is gathered for gathering data by disposing multiple crack data on each blade；Bunch interior nodes realizes the location positioning of crackle by D&S evidence theory and three-point fox method, connects field monitor network by Ethernet or GPRS/3G network and crack data is stored into data center, understands cracks can spread situation in real time so that early warning in time.This patent be can complete detection blade occur crackle, must additionally arrange a large amount of crackle awareness apparatus, even if so the most not there is seriality, additionally need to arrange on blade that gathering sensor is responsible for uninterrupted sampling data, but whether crackle awareness apparatus or voice sending sensor node not only can be corroded by dust storm in running, easily damage, and the aerodynamic configuration of blade is affected bigger, thus weaken the aeroperformance of blade, reduce generating efficiency etc..In addition use acoustic emission that blade crack of wind driven generator is monitored, need to consider the acoustic emission signal characteristic of composite.The acoustic emission signal frequency of composite is at more than 100kHz.During being amplified signal processing, common amplifying circuit has good amplification to low frequency signal, but when cracking wind electricity blade, the amplification of the high-frequency signal of release is undesirable, and output signal can produce distortion phenomenon.
Fast development along with wind-powered electricity generation industry, improving constantly of wind electricity blade prescription, require that blade Years Of Service meets design requirement, how in the case of blade self-defect is the least, find defect type, region and scope in time, taking maintenance and the maintenance measure of necessity, the prolongation to blade service life can play obvious positive role.Simultaneously because distance ground, wind energy conversion system cabin is the most remote, difference along with length of blade, distance is from 80 meters to 200 meters, must install with special equipment, so the installation cost of wind electricity blade is high, how to accomplish that blade is exempted from dismounting and monitors in real time in operation process, the technology i.e. needing a kind of long-range monitoring blade interlayer to damage realizes.
Summary of the invention
In view of the problem in the presence of prior art, the present invention proposes one and utilizes Intelligent carbon fiber layer sensing characteristics, uses it for wind electricity blade interlayer structure damage status monitoring technology.Utilize functional characteristic and the distinctive form-dependent character of composite of Intelligent carbon fiber layer, it is routed to wind electricity blade main components surface, Intelligent carbon fiber layer and by geodesic structure between set up a sensitivity " field ", Intelligent carbon fiber layer is different from the operation principle of discrete type intelligent layer or sensing network system, it be not the detection information with " point " to identify the performance of its neighborhood or structural region, but identify by service structure characteristic being carried out diagnosis with sensitive " field " information.And preferably the sensing limit of Intelligent carbon fiber layer can reach 8500 microstrains, detection range is widely.Intelligent layer will be the electric field being prone to detection by the force field transform of geodesic structure, in conjunction with ERT chromatography imaging technique, the resistivity of sensitivity field is distributed tested structural stress, the situation of strain of understanding, thus can determine whether that position and the order of severity of damage occurs in structure.
For achieving the above object, the concrete technical scheme that the present invention is taked is: a kind of remotely monitoring wind electricity blade interlayer structure damage method, and its concrete monitoring method is:
Lay Intelligent carbon fiber layer in the structural member spar cap and trailing edge beam of wind electricity blade, Intelligent carbon fiber layer is laid in above the spar cap under the exterior skin of wind electricity blade and above trailing edge beam under exterior skin respectively；Spar cap both sides use core to fill, and be also adopted by core and fill below trailing edge beam, and upper and lower two the demifacet adhesives of wind electricity blade are bonding；Two ends, Intelligent carbon fiber layer overlay area are equipped with electrode, and electrode conductive silver glue is pasted onto on Intelligent carbon fiber layer, and the copper conductor one end on Intelligent carbon fiber layer connects electricity level, the other end connects lithium battery, body structure surface is carried out electric current, voltage drive, sets up sensitivity field, be i.e. Potential Distributing；In the middle of Intelligent carbon fiber layer, overlay area spaced set along its length has the electrode being connected with copper conductor；The other end of copper conductor is connected with the multi-Channels Data Acquisition being contained within wind electricity blade respectively, gather the Potential Distributing signal of intelligent layer and be sent to far-end, gather signal data by the wireless voltage acquisition module of far-end and transmit ERT chromatographic imaging system and the computer processed for data；nullThe resistance of Intelligent carbon fiber layer has significantly response to load change，When there is damage in wind electricity blade interlayer structure，Violent Stress Release can be produced，Intelligent carbon fiber layer can produce change in resistance under load change，When internal resistance rate distribution on the spot changes，The distribution of current field can change therewith，Cause the change of Potential Distributing，Thus the borderline current potential of field domain also to change，Measure the change in voltage situation obtained and reflect the change of resistivity，Gather the network voltage signal of Intelligent carbon fiber layer overlay area with the multi-Channels Data Acquisition being built in blade interior and be transferred to the wireless voltage acquisition module of far-end and carry out voltage data collection，The data input computer that simultaneously will gather，It is aided with the resistivity distribution that ERT chromatographic imaging system is set up in Intelligent carbon fiber Rotating fields again，And it is converted into the stress distribution in wind electricity blade structure，Linear corresponding relation is there is in the mechanical resistance effect resistance utilizing Intelligent carbon fiber layer with strain，There is position and the degree of damage in the final wind electricity blade structure interlayer structure that obtains.
Described a kind of remotely monitoring wind electricity blade interlayer structure damage method, wherein Intelligent carbon fiber layer is to use epoxy resin base carbon fiber felt to make, and so can suit with blade resin system perfection；Described ERT chromatographic imaging system is a set of ERT containing stimulating module, multiplexing switching switch, projection data acquisitions module, image reconstruction module and image shows and data memory module etc., first ERT system sets up the resistivity distribution of tested structural member according to the Potential Distributing of tested structural member and own material properties, and it is converted into its original strain field, under structural member stress generation degree of impairment, its resistivity can occur significantly to change thus affect its original strain field.Described material mechanical resistance effect refers to when material is produced strain by External Force Acting, the phenomenon that material resistance changes, with the relative change rate of resistance under the conditions of unit strain, i.e. material sensitivity characterizes, sensitivity the highest expression Intelligent carbon fiber layer is the most sensitive to external force reaction, is more readily detected position and the order of severity of the damage of structure interlayer.
The invention has the beneficial effects as follows: monitor the most in real time, Intelligent carbon fiber layer has the highest sensitivity, process can be used to be monitored blade in real time, when blade construction occurs that interlayer damages, Intelligent carbon fiber layer overlay area resistivity can be caused to change, thus received by remote monitoring collecting device；2. high-altitude, blade mounting distance ground 80～100m, can save a large amount of manpower and materials without laying down blade, and is not required to shut down and does not affect wind energy conversion system and normally work；3. the Intelligent carbon fiber layer used inherently a kind of composite, not only consistent with blade raw material system, can be well compatible, may also provide some strength rigidity, blade mechanical property is played the effect of strengthening.
Accompanying drawing explanation
Fig. 1 is spar cap and trailing edge beam distribution schematic diagram on wind electricity blade；
Fig. 2 is the Section A-A figure of spar cap in Fig. 1；
Fig. 3 is the section B-B figure of trailing edge beam in Fig. 1；
Fig. 4 is Intelligent carbon fiber layer overlay area connection diagram；
Fig. 5 is multi-Channels Data Acquisition scheme of installation；
Fig. 6 is wireless voltage acquisition module connection diagram.
In figure: 1, wind electricity blade；2, spar cap；3, trailing edge beam；4, core；5, exterior skin；6, Intelligent carbon fiber layer；7, adhesive；8, multi-Channels Data Acquisition；9, wireless voltage acquisition module；10, ERT chromatographic imaging system；11, computer；12, electrode；13, copper conductor；14, conductive silver glue；15, lithium battery.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the detailed description of the invention providing the present invention is as follows:
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, a kind of remotely monitoring wind electricity blade interlayer structure damage method is: in the structural member spar cap 2 and trailing edge beam 3 of wind electricity blade 1, a kind of form-dependent character of lay is good, have the Intelligent carbon fiber layer 6 obvious responsing to, using resin-based carbon fiber composite to make to load change；Intelligent carbon fiber layer 6 is laid in 4 times spar cap 2 of exterior skin of wind electricity blade 1 and on 5 times trailing edge beams 3 of exterior skin respectively, and the both sides of spar cap 2 use core 4 to fill, and be also adopted by core 4 and fill below trailing edge beam 3, and about 1 two demifacet adhesive of wind electricity blade is bonding；Intelligent carbon fiber layer 6 and by geodesic structure wind electricity blade 1 between set up a sensitivity " field ".The sensing limit utilizing the Intelligent carbon fiber layer 6 that resin-based carbon fiber composite makes can reach 8500 emblems strain such a detection range characteristics widely, when there is damage in wind electricity blade 1 interlayer structure, violent Stress Release can be produced, Intelligent carbon fiber layer 6 will produce change in resistance under load change, thus the voltage caused exports.The two ends of Intelligent carbon fiber layer 6 overlay area are pasted onto on Intelligent carbon fiber layer 6 equipped with electrode 12, electrode 12 conductive silver glue 14.Copper conductor 13 one end on Intelligent carbon fiber layer 6 is connected with electrode 12, and the other end is connected with lithium battery 15.Body structure surface is carried out electric current, voltage drive, sets up sensitivity field, i.e. Potential Distributing；The middle overlay area of fiber intelligent layer 6 is the most equidistantly provided with the electrode 12 interconnected with copper conductor 13, the other end of copper conductor 13 is connected with multi-Channels Data Acquisition 8, and multi-Channels Data Acquisition 8 is carried out data transmission with Remote Radio pressure acquisition module 9, ERT chromatographic imaging system 10 and the computer 11 processed for data by wireless data transmission technology.The resistance selecting Intelligent carbon fiber layer 6 that felt composite material makes with epoxy resin base carbon fiber has significantly response for load change, when there is damage in wind electricity blade 1 interlayer structure, violent Stress Release can be produced, at this moment Intelligent carbon fiber layer 6 produces change in resistance under load change, thus the change in voltage caused forms " network voltage " signal in the overlay area of Intelligent carbon fiber layer 6.Multi-Channels Data Acquisition 8 is utilized to gather " network voltage " of Intelligent carbon fiber layer 6 overlay area and be transferred to the wireless voltage acquisition module 9 of far-end and carry out voltage data collection the data input computer 11 that will gather, it is aided with ERT chromatographic imaging system 10 again and rebuilds the stress in the change in resistance of Intelligent carbon fiber layer 6 structure centre and wind electricity blade 1 structure, stress distribution, the stress original with wind electricity blade 1, stress distribution is compared, obvious stress is there will be in structural damage region, strain concentration phenomenon, finally give damage position and the order of severity that wind electricity blade 1 structure interlayer occurs.
Claims (3)
1. a long-range monitoring wind electricity blade interlayer structure damage method, is characterized in that: remotely monitoring wind electricity blade interlayer structure damage method is specific as follows:
At structural member spar cap (2) and upper lay Intelligent carbon fiber layer (6) of trailing edge beam (3) of wind electricity blade, the spar cap (2) that Intelligent carbon fiber layer (6) is laid under the exterior skin of wind electricity blade (1) respectively is above with the trailing edge beam (3) under exterior skin above；Spar cap (2) both sides use core to fill, and be also adopted by core and fill below trailing edge beam (3), and upper and lower two the demifacet adhesives (7) of wind electricity blade (1) are bonding；Intelligent carbon fiber layer (6) two ends, overlay area are equipped with electrode (12), electrode (12) conductive silver glue (14) is pasted onto on Intelligent carbon fiber layer (6), copper conductor (13) one end on Intelligent carbon fiber layer (6) connects electricity level (12), the other end connects lithium battery (15), body structure surface is carried out electric current, voltage drive, set up sensitivity field, i.e. Potential Distributing；In the middle of Intelligent carbon fiber layer (6), overlay area spaced set along its length has the electrode (12) being connected with copper conductor (13)；The other end of copper conductor (13) is connected with the multi-Channels Data Acquisition (8) being contained in wind electricity blade (1) inside respectively；nullThe resistance of Intelligent carbon fiber layer (6) has significantly response to load change，When there is damage in wind electricity blade (1) interlayer structure，Violent Stress Release can be produced，Intelligent carbon fiber layer (6) can produce change in resistance under load change，When internal resistance rate distribution on the spot changes，The distribution of current field can change therewith，Cause the change of Potential Distributing，Thus the borderline current potential of field domain also to change，Measure the change in voltage situation obtained and reflect the change of resistivity，Gather the network voltage signal of Intelligent carbon fiber layer (6) overlay area with being built in the internal multi-Channels Data Acquisition (8) of wind electricity blade (1) and be transferred to the wireless voltage acquisition module (9) of far-end and carry out voltage data collection，Data input computer (11) that simultaneously will gather，It is aided with the resistivity distribution that ERT chromatographic imaging system (10) is set up in Intelligent carbon fiber layer (6) structure again，And it is converted into the stress distribution in wind electricity blade (1) structure，Utilize the mechanical resistance effect of Intelligent carbon fiber layer (6)，There is linear corresponding relation in i.e. resistance and strain，There is position and the degree of damage in the final wind electricity blade structure interlayer structure that obtains.
One the most according to claim 1 remotely monitors wind electricity blade interlayer structure damage method, it is characterized in that: Intelligent carbon fiber layer (6) uses epoxy resin base carbon fiber felt to make.
One the most according to claim 1 remotely monitors wind electricity blade interlayer structure damage method, it is characterized in that: ERT chromatographic imaging system (10) is that containing stimulating module, multiplexing switching switch, projection data acquisitions module, image reconstruction module and image shows a set of ERT and data memory module is constituted.
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| US10488279B2 (en) | 2017-08-02 | 2019-11-26 | General Electric Company | Components configured to autonomously detect and accommodate structural changes |
| CN107655979A (en) * | 2017-08-07 | 2018-02-02 | 中材科技（阜宁）风电叶片有限公司 | The lossless detection method of rear edge of wind turbine blade adhesion zone |
| CN109254082A (en) * | 2018-10-24 | 2019-01-22 | 清诚声发射研究（广州）有限公司 | A kind of wind electricity blade damage monitoring alarm system |
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| CN102109498A (en) * | 2009-12-28 | 2011-06-29 | 天津工业大学 | Nondestructive testing system and testing analysis method for three-dimensional braided composite material |
| DE102011006635A1 (en) * | 2011-04-01 | 2012-10-04 | Aloys Wobben | Wind turbine |
| CN102721741B (en) * | 2012-06-18 | 2014-05-28 | 北京科技大学 | Wind power blade damage monitoring and positioning system based on wireless acoustic emission sensor network |
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Effective date of registration: 20170720 Address after: 839000 Xinjiang Hami Industrial Park, Guangdong, Hami industrial processing Patentee after: Xinjiang Ruifeng electric double blade Co. Address before: 471039 No. 40 Binhe Road, hi tech Development Zone, Henan, Luoyang Patentee before: Luoyang Sunrui Wind Turbine Blade.Ltd |
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Effective date of registration: 20190506 Address after: 116400 Lingang Industrial Park 123-5, Dalian Emerging Industrial Economic Zone, Zhuanghe City, Dalian City, Liaoning Province Patentee after: Dalian Shuangrui Wind Power Blade Co., Ltd. Address before: 839000 Hami Industrial Park, Xinjiang, Guangdong Industrial Processing Patentee before: Xinjiang Ruifeng electric double blade Co. |