CN104034803B - The sensing device that main passive waveguide monitoring bridge draws hoist cable to damage and monitoring method thereof - Google Patents
The sensing device that main passive waveguide monitoring bridge draws hoist cable to damage and monitoring method thereof Download PDFInfo
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- CN104034803B CN104034803B CN201410260203.4A CN201410260203A CN104034803B CN 104034803 B CN104034803 B CN 104034803B CN 201410260203 A CN201410260203 A CN 201410260203A CN 104034803 B CN104034803 B CN 104034803B
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Abstract
The invention provides a kind of sensing device led passive waveguide monitoring bridge and draw hoist cable to damage, described sensing device comprises a clip drawing hoist cable diameter to match with described bridge; Described clip axially offer 5 road first cuttings; Upper hoop and lower hoop offer 2 road second cuttings respectively in the circumferential; Upper hoop and lower hoop one side offer one with clip respectively with long wire casing; Cutting is provided with 20 piezoceramic transducers; The upper surface of piezoceramic transducer welds a signal transmssion line, and transmission line carries out cabling along wire casing, and transmission line is high shielding coaxial cable, and described sensing device surface is laid with an insulation course; Described surface of insulating layer is laid with an electro-magnetic screen layer.Present invention also offers a kind of sensing device monitoring method led passive waveguide monitoring bridge and draw hoist cable to damage, the present invention can gather the data that bridge draws hoist cable to damage well, can realize the damage that lossless detection full-bridge beam draws hoist cable.
Description
Technical field
The present invention relates to construction engineering technical field, particularly a kind ofly lead the sensing device and monitoring method thereof that passive waveguide monitoring bridge draws hoist cable to damage.
Background technology
Long-span bridges is the economic lifeline of countries and regions, and the construction of bridge and maintenance are the piths of a national basis facility.In long-span bridges, hoist cable is drawn to be main primary structure member.Within the operating period reaching decades; under the coupling of the long-term effect of environmental attack, material aging and load, fatigue effect and the factor such as catastrophe effect suddenly; to inevitably cause damage accumulation and the degradation resistance of structure and system; thus the ability under opposing disaster, even home effect declines, and will cause catastrophic burst accident under extreme case.Newly building bridge draws the cost of hoist cable generally to account for 25% ~ 30% of full-bridge, if change rope to it, the price of changing rope is newly-built 3 ~ 4 times.Current bridge draws hoist cable damage monitoring method to have manual detection method, and the method carries out body structure surface observation mainly through naked eyes or magnifier, helpless to inherent vice; Ultrasonic detection method, by echo time and signal intensity, knows the position of damage.The method effect in bridge draws hoist cable to detect is undesirable, and mainly there are some spaces because draw between hoist cable inner wire (steel strand wires), surface relief is uneven, and damage field is not fixed, and causes echoed signal unintelligible.Ray detection can only one section of detection, and testing cost is higher, expensive equipment, have certain radiativity.Although Magnetic Flux Leakage Inspecting method more clearly can judge position and the quantity of fracture of wire; but this equipment is complicated, draw hoist cable for what have an external protection, not high, the same defect spatial resolution of accuracy of detection is not high; damage for the hoist cable that draws be embedded in beam, Detection results is poorer.
Since piezoelectric effect is found, the application in hoist cable damage monitoring has been drawn to get the attention the investigation and application of piezoelectric at bridge.Piezoelectric ceramics has positive inverse piezoelectric effect.Utilize the positive-effect of piezoelectric ceramics, developed active waveguide monitoring technology (supersonic guide-wave), detected the existence of damage by " inquiry " structure, and estimate its degree; Utilize its back wash effect, be developed into passive waveguide monitoring technology (acoustic emission), do not need it to interact by the response of " listening " structure, monitoring of structures damages.Waveguide detection technique has a lot of outstanding advantages: long, highly sensitive, the different mode of propagation distance to different type of impairments sensitivity, detect wide.The vibration that guided wave is drawing the inside of hoist cable and surface to have particle, sound field is throughout whole waveguide, the signal received comprises the globality information of drawing the inner and contact interface of hoist cable, and therefore guided wave detection technology can detect the information of whole waveguide, instead of a point or a face.The damage monitoring of hoist cable is drawn to obtain some application at bridge based on active waveguide monitoring technology (supersonic guide-wave) at present, the method has good accuracy of detection to the damage existed, but undesirable for drawing the damage development monitoring effect of hoist cable.And passive waveguide monitoring technology (acoustic emission) draws the damage helpless existed in hoist cable to bridge, but to drawing hoist cable damage development to have higher monitoring accuracy.
Summary of the invention
One of the technical problem to be solved in the present invention, be to provide a kind of sensing device led passive waveguide monitoring bridge and draw hoist cable to damage, the data that bridge draws hoist cable to damage being gathered well, drawing the damage of hoist cable to provide a hardware platform for realizing lossless detection full-bridge beam.
One of problem of the present invention is achieved in that a kind of sensing device led passive waveguide monitoring bridge and draw hoist cable to damage, and described sensing device comprises a clip drawing hoist cable diameter to match with described bridge; Described clip axially offer at least 5 road first cuttings, and each first cutting is uniformly distributed; Described clip comprises upper and lower two hoop bodies; Described upper hoop and lower hoop offer at least 2 road second cuttings respectively in the circumferential; Upper hoop and total 4 road second cuttings of lower hoop are uniformly distributed, and upper hoop becomes 90 degree of angles with two cornerwise second cuttings after lower hoop fastening; Described upper hoop and lower hoop one side offer one with clip respectively with long wire casing; In described 5 road first cuttings the 1st, 3,5 roads are provided with 4 piezoceramic transducers, and the long edge clip of each 4 piezoceramic transducers is circumferentially and be positioned in 4 road second cuttings, as the sensing device producing torsion mode; In 5 road first cuttings the 2nd, 4 roads are provided with 4 piezoceramic transducers, and the long edge clip of each 4 piezoceramic transducers is axial arranged and be positioned in 4 road second cuttings, as the sensing device producing longitudinal mode; The upper surface of described piezoceramic transducer welds a signal transmssion line, and transmission line carries out cabling along wire casing, and described transmission line is high shielding coaxial cable, and described sensing device surface is laid with an insulation course; Described surface of insulating layer is laid with an electro-magnetic screen layer, and electro-magnetic screen layer is connected by epoxy resin with insulation course; Piezoceramic transducer on 3 roads of 5 road first cuttings is wherein set as the piezoceramic transducer on active monitoring, 2 remaining roads as passive monitoring; Or the piezoceramic transducer on 2 roads of 5 road first cuttings as the piezoceramic transducer on active monitoring, 3 remaining roads as passive monitoring.
Further, described clip is cylindrical clip.
Further, the spacing of adjacent two first cuttings of described 5 road first cuttings is 15 ~ 25mm; Described each second groove depth is 3 ~ 4mm, and length is 20 ~ 30mm; The width of described wire casing is 5 ~ 10mm; Described thickness of insulating layer is 0.1 ~ 0.3mm; The thickness of electro-magnetic screen layer is 0.5 ~ 2mm.
Further, described insulation course is the thin adhesive tape of thermosetting imines; Described electro-magnetic screen layer is superelevation conductive silicon rubber.
Further, described piezoceramic transducer adopts cementing agent to be fixed in the first cutting or the second cutting.
The technical problem to be solved in the present invention two, is to provide a kind of sensing device monitoring method led passive waveguide monitoring bridge and draw hoist cable to damage, can gathers the data that bridge draws hoist cable to damage well, can realize the damage that lossless detection full-bridge beam draws hoist cable.
Two of problem of the present invention is achieved in that a kind of sensing device monitoring method led passive waveguide monitoring bridge and draw hoist cable to damage;
Described monitoring method need provide described sensing device, main passive waveguide sensor trigger element, passive waveguide feedback unit and a PC; Described sensing device comprises a clip drawing hoist cable diameter to match with described bridge; Described clip axially offer 5 road first cuttings, described clip comprises upper and lower two hoop bodies; Described upper hoop and lower hoop offer 2 road second cuttings respectively in the circumferential; Upper hoop and total 4 road second cuttings of lower hoop are uniformly distributed, and described upper hoop and lower hoop one side offer one with clip respectively with long wire casing; In described 5 road first cuttings the 1st, 3,5 roads are provided with 4 piezoceramic transducers, as the sensing device producing torsion mode; In 5 road first cuttings the 2nd, 4 roads are provided with 4 piezoceramic transducers, as the sensing device producing longitudinal mode; The passive waveguide sensor trigger element of described master comprises the signal generator and piezoelectric ceramics power amplifier that connect successively; Described passive waveguide feedback unit comprises the amplifier and signal A/D converter that connect successively;
Described method is specially: arrange piezoceramic transducer on 3 roads of 5 road first cuttings as the piezoceramic transducer on active monitoring, 2 remaining roads as passive monitoring; Or the piezoceramic transducer on 2 roads of 5 road first cuttings as the piezoceramic transducer on active monitoring, 3 remaining roads as passive monitoring; Described PC sends control signal to described piezoelectric ceramics power amplifier after described signal generator process, and piezoelectric ceramics power amplifier carries out amplifying the described sensing device of rear triggering and monitors; Described sensing device utilizes the positive-effect of piezoceramic transducer, and the degree obtaining bridge and draw hoist cable to damage is tested in the monitoring of development active waveguide; The degree of injury of acquisition is directly sent to PC, and PC carries out acquisition process; Sensing device utilizes the back wash effect of piezoceramic transducer, develop passive waveguide monitoring to respond bridge draw hoist cable damage and do not need interact, thus test obtains the degree that bridge draws hoist cable to damage, by degree of injury signal after amplifier amplifies, send to described signal A/D converter, signal A/D converter is treated sends to PC, and PC carries out acquisition process.
Further, described clip is cylindrical clip.
Further, the spacing of adjacent two first cuttings of described 5 road first cuttings is 15 ~ 25mm; Described each second groove depth is 3 ~ 4mm, and length is 20 ~ 30mm; The width of described wire casing is 5 ~ 10mm; Described thickness of insulating layer is 0.1 ~ 0.3mm; The thickness of electro-magnetic screen layer is 0.5 ~ 2mm.
Further, described insulation course is the thin adhesive tape of thermosetting imines; Described electro-magnetic screen layer is superelevation conductive silicon rubber.
Further, described piezoceramic transducer adopts cementing agent to be fixed in the first cutting or the second cutting.
The invention has the advantages that: the present invention the two kinds of sensor integration producing longitudinal mode and torsion mode to together with, form 5 roads and detect, and on clip, be provided with high shielding coaxial cable, insulation course and electro-magnetic screen layer; Thus form the passive waveguide testing sensor of master with electromagnetic screen and filter function; Wherein three road sensors as active monitoring, two remaining road sensors as passive monitoring; Or two road sensors as active monitoring, three remaining road sensors as passive monitoring.The present invention can gather the data that bridge draws hoist cable to damage well, can realize the damage that lossless detection full-bridge beam draws hoist cable.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention removes insulation course and electro-magnetic screen layer.
Fig. 2 is schematic cross-section of the present invention.
Fig. 3 is the theory diagram of monitoring method of the present invention.
Embodiment
Refer to shown in Fig. 1 and Fig. 2, a kind of sensing device led passive waveguide monitoring bridge and draw hoist cable to damage, described sensing device comprises a clip 1 drawing hoist cable diameter to match with described bridge; Described clip 1 axially offer at least 5 road first cuttings 11, and each first cutting 11 is uniformly distributed; Described clip 1 comprises upper and lower two hoop bodies (12,13); Described upper hoop 12 and lower hoop 13 offer at least 2 road second cuttings 14 respectively in the circumferential; Upper hoop 12 and total 4 road second cuttings 14 of lower hoop 13 are uniformly distributed, and upper hoop 12 and two cornerwise second cuttings, 14 one-tenth 90 degree of angle α after lower hoop 13 fastening; Described upper hoop 12 and lower hoop 13 1 side offer one with clip 1 respectively with long wire casing (not shown); In described 5 road first cuttings 11 the 1st, 3,5 roads are provided with 4 piezoceramic transducers 3, and the long edge clip of each 4 piezoceramic transducers 3 is circumferentially and be positioned in 4 road second cuttings 14, as the sensing device producing torsion mode; In 5 road first cuttings 11 the 2nd, 4 roads are provided with 4 piezoceramic transducers, and the long edge clip of each 4 piezoceramic transducers is axial arranged and be positioned in 4 road second cuttings 14, as the sensing device producing longitudinal mode; The upper surface of described piezoceramic transducer 3 welds a signal transmssion line (not shown), and transmission line carries out cabling along wire casing, and described transmission line is high shielding coaxial cable, and described sensing device surface is laid with an insulation course 4; Described insulation course 4 surface is laid with an electro-magnetic screen layer 5, and electro-magnetic screen layer 5 is connected by epoxy resin (not shown) with insulation course 4.Piezoceramic transducer 3 on 3 roads of 5 road first cuttings 11 is wherein set as the piezoceramic transducer 3 on active monitoring, 2 remaining roads as passive monitoring; Or the piezoceramic transducer 3 on 2 roads of 5 road first cuttings 11 as the piezoceramic transducer 3 on active monitoring, 3 remaining roads as passive monitoring.
Described clip 1 is cylindrical clip in the present invention.As long as in practical application also can for other shapes can hoist cable be drawn to hold tightly bridge.
Wherein, the spacing of adjacent two first cuttings 11 of described 5 road first cuttings 11 is 15 ~ 25mm.Described each second cutting 14 degree of depth is 3 ~ 4mm, and length is 20 ~ 30mm; The width of described wire casing is 5 ~ 10mm.
In addition, described piezoceramic transducer adopts cementing agent to be fixed in the first cutting 11 or the second cutting 14.Described thickness of insulating layer is 0.1 ~ 0.3mm; The thickness of screen layer is 0.5 ~ 2mm.Described insulation course 4 is the thin adhesive tape of thermosetting imines; Described electro-magnetic screen layer 5 is superelevation conductive silicon rubber.
Refer to shown in Fig. 1 to Fig. 3, a kind of sensing device monitoring method led passive waveguide monitoring bridge and draw hoist cable to damage;
Described monitoring method need provide described sensing device, main passive waveguide sensor trigger element, passive waveguide feedback unit and a PC; Described sensing device comprises a clip 1 drawing hoist cable diameter to match with described bridge; Described clip 1 axially offer at least 5 road first cuttings 11, described clip 1 comprises upper and lower two hoop bodies (12,13); Described upper hoop 12 and lower hoop 13 offer at least 2 road second cuttings 14 respectively in the circumferential; Upper hoop 12 and total 4 road second cuttings 14 of lower hoop 13 are uniformly distributed, and described upper hoop 12 and lower hoop 13 1 side offer one with clip 1 respectively with long wire casing (not shown); In described 5 road first cuttings 11 the 1st, 3,5 roads are provided with 4 piezoceramic transducers 3, as the sensing device producing torsion mode; In 5 road first cuttings 11 the 2nd, 4 roads are provided with 4 piezoceramic transducers, as the sensing device producing longitudinal mode; The passive waveguide sensor trigger element of described master comprises the signal generator and piezoelectric ceramics power amplifier that connect successively; Described passive waveguide feedback unit comprises the amplifier and signal A/D converter that connect successively;
Described method is specially: arrange piezoceramic transducer 3 on 3 roads of 5 road first cuttings 11 as the piezoceramic transducer 3 on active monitoring, 2 remaining roads as passive monitoring; Or the piezoceramic transducer 3 on 2 roads of 5 road first cuttings 11 as the piezoceramic transducer 3 on active monitoring, 3 remaining roads as passive monitoring; Described PC sends control signal to described piezoelectric ceramics power amplifier after described signal generator process, and piezoelectric ceramics power amplifier carries out amplifying the described sensing device of rear triggering and monitors; Described sensing device utilizes the positive-effect of piezoceramic transducer, forms active waveguide monitoring and tests the degree obtaining bridge and draw hoist cable to damage; The degree of injury of acquisition is directly sent to PC, and PC carries out acquisition process; Sensing device utilizes the back wash effect of piezoceramic transducer, formed passive waveguide monitoring to respond bridge draw hoist cable damage and do not need interact, thus test obtains the degree that bridge draws hoist cable to damage, by degree of injury signal after amplifier amplifies, send to described signal A/D converter, signal A/D converter is treated sends to PC, and PC carries out acquisition process.
Described clip 1 is cylindrical clip in the present invention.As long as in practical application also can for other shapes can hoist cable be drawn to hold tightly bridge.
Wherein, the spacing of adjacent two first cuttings 11 of described 5 road first cuttings 11 is 15 ~ 25mm.Described each second cutting 14 degree of depth is 3 ~ 4mm, and length is 20 ~ 30mm; The width of described wire casing is 5 ~ 10mm.
In addition, described piezoceramic transducer adopts cementing agent to be fixed in the first cutting 11 or the second cutting 14.Described thickness of insulating layer is 0.1 ~ 0.3mm; The thickness of screen layer is 0.5 ~ 2mm.Described insulation course 4 is the thin adhesive tape of thermosetting imines; Described electro-magnetic screen layer 5 is superelevation conductive silicon rubber.
Here it is worth mentioning that:
Main passive waveguide monitoring bridge draws the integrated sensing apparatus design of hoist cable to need solution two technical matterss: 1) main Passive Test sensor piezoelectric ceramics quantity, laying method optimizing and electromangnetic spectrum.The factor of drawing hoist cable to lose efficacy due to bridge is a lot, and the susceptibility of different defects to difference excitation mode is different.Document in the past, no matter which type of defect, all adopts longitudinal wave guide mode.In engineer applied, effect is not ideal sometimes.The present invention adopts multiple piezoceramic transducer waveguide test device, selects axisymmetric longitudinal mode and torsion mode to encourage.In test process, this two mode test result are contrasted, determine to select which type of mode, to improve measuring accuracy.In addition when selecting high order mode to encourage, must be optimized the number of turns of piezoceramic transducer, to suppress the impact of lower mode.The present invention the two kinds of sensor integration producing longitudinal mode and torsion mode to together with, form the optimal design that 5 circles are popped one's head in.Current active waveguide sensor is all that direct applying piezoelectric sensor is as excitation and receiving sensor, but directly applying piezoelectric ceramic causes the signal to noise ratio (S/N ratio) of signal too small as passive optical waveguide probe because of electromagnetic interference (EMI), electromangnetic spectrum should be developed and filtering technique is integrated in the passive optical waveguide probe of piezoelectric ceramics.Thus form the passive waveguide testing sensor of master with electromagnetic screen and filter function.2) sensor-triggered mode and main passive monitoring scheme thereof are selected.Acquisition system provides signal accurately to trigger and sensor switches, and accurately carries out as required leading passive monitoring; Carry out main Passive Test even simultaneously and (piezoceramic transducer on 3 roads of 5 road first cuttings is wherein set as the piezoceramic transducer on active monitoring, 2 remaining roads as passive monitoring; Or the piezoceramic transducer on 2 roads of 5 road first cuttings as the piezoceramic transducer on active monitoring, 3 remaining roads as passive monitoring).When waveguide monitoring, main passive sensor is connected on Acquisition Instrument, according to the size of monitor signal amplitude in Acquisition Instrument, selects rational monitoring mode.
In a word, the present invention draws hoist cable damage monitoring difficult problem by effectively solving current bridge.The method not only can detect the damage that bridge draws hoist cable existing, can also monitor bridge and draw hoist cable damage development process.Especially for being embedded in beam, anchor is indoor etc., and invisible bridge draws hoist cable damage monitoring to have more advantage, do not need as current common detection methods, need destroy beam or open the detection methods such as anchor room, bring the secondary damage of structure.Of the present inventionly directly sensing device is laid on cable body, does not destroy any cable body structure, really realize lossless detection full-bridge beam and draw hoist cable to damage.Draw in hoist cable damage check at bridge and there is great Social and economic benef@.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the passive waveguide monitoring bridge of the master sensing device that draws hoist cable to damage, is characterized in that: described sensing device comprises a clip drawing hoist cable diameter to match with described bridge; Described clip axially offer at least 5 road first cuttings, and each first cutting is uniformly distributed; Described clip comprises upper and lower two hoop bodies; Described upper hoop and lower hoop offer at least 2 road second cuttings respectively in the circumferential; Upper hoop and total 4 road second cuttings of lower hoop are uniformly distributed, and upper hoop becomes 90 degree of angles with two cornerwise second cuttings after lower hoop fastening; Described upper hoop and lower hoop one side offer one with clip respectively with long wire casing; In described 5 road first cuttings the 1st, 3,5 roads are provided with 4 piezoceramic transducers, and the long edge clip of each 4 piezoceramic transducers is circumferentially and be positioned in 4 road second cuttings, as the sensing device producing torsion mode; In 5 road first cuttings the 2nd, 4 roads are provided with 4 piezoceramic transducers, and the long edge clip of each 4 piezoceramic transducers is axial arranged and be positioned in 4 road second cuttings, as the sensing device producing longitudinal mode; The upper surface of described piezoceramic transducer welds a signal transmssion line, and transmission line carries out cabling along wire casing, and described transmission line is high shielding coaxial cable, and described sensing device surface is laid with an insulation course; Described surface of insulating layer is laid with an electro-magnetic screen layer, and electro-magnetic screen layer is connected by epoxy resin with insulation course; Piezoceramic transducer on 3 roads of 5 road first cuttings is wherein set as the piezoceramic transducer on active monitoring, 2 remaining roads as passive monitoring; Or the piezoceramic transducer on 2 roads of 5 road first cuttings as the piezoceramic transducer on active monitoring, 3 remaining roads as passive monitoring.
2. the passive waveguide monitoring bridge of the master according to claim 1 sensing device that draws hoist cable to damage, is characterized in that: described clip is cylindrical clip.
3. the passive waveguide monitoring bridge of the master according to claim 1 sensing device that draws hoist cable to damage, is characterized in that: the spacing of adjacent two first cuttings of described 5 road first cuttings is 15 ~ 25mm; Described each second groove depth is 3 ~ 4mm, and length is 20 ~ 30mm; The width of described wire casing is 5 ~ 10mm; Described thickness of insulating layer is 0.1 ~ 0.3mm; The thickness of electro-magnetic screen layer is 0.5 ~ 2mm.
4. the passive waveguide monitoring bridge of the master according to claim 1 sensing device that draws hoist cable to damage, is characterized in that: described insulation course is the thin adhesive tape of thermosetting imines; Described electro-magnetic screen layer is superelevation conductive silicon rubber.
5. the passive waveguide monitoring bridge of the master according to claim 1 sensing device that draws hoist cable to damage, is characterized in that: described piezoceramic transducer adopts cementing agent to be fixed in the first cutting or the second cutting.
6. master's passive waveguide monitoring bridge sensing device monitoring method of drawing hoist cable to damage, is characterized in that:
Described monitoring method need provide described sensing device, main passive waveguide sensor trigger element, passive waveguide feedback unit and a PC; Described sensing device comprises a clip drawing hoist cable diameter to match with described bridge; Described clip axially offer 5 road first cuttings, described clip comprises upper and lower two hoop bodies; Described upper hoop and lower hoop offer 2 road second cuttings respectively in the circumferential; Upper hoop and total 4 road second cuttings of lower hoop are uniformly distributed, and described upper hoop and lower hoop one side offer one with clip respectively with long wire casing; In described 5 road first cuttings the 1st, 3,5 roads are provided with 4 piezoceramic transducers, as the sensing device producing torsion mode; In 5 road first cuttings the 2nd, 4 roads are provided with 4 piezoceramic transducers, as the sensing device producing longitudinal mode; The passive waveguide sensor trigger element of described master comprises the signal generator and piezoelectric ceramics power amplifier that connect successively; Described passive waveguide feedback unit comprises the amplifier and signal A/D converter that connect successively;
Described method is specially: arrange piezoceramic transducer on 3 roads of 5 road first cuttings as the piezoceramic transducer on active monitoring, 2 remaining roads as passive monitoring; Or the piezoceramic transducer on 2 roads of 5 road first cuttings as the piezoceramic transducer on active monitoring, 3 remaining roads as passive monitoring; Described PC sends control signal to described piezoelectric ceramics power amplifier after described signal generator process, and piezoelectric ceramics power amplifier carries out amplifying the described sensing device of rear triggering and monitors; Described sensing device utilizes the positive-effect of piezoceramic transducer, and the degree obtaining bridge and draw hoist cable to damage is tested in the monitoring of development active waveguide; The degree of injury of acquisition is directly sent to PC, and PC carries out acquisition process; Sensing device utilizes the back wash effect of piezoceramic transducer, develop passive waveguide monitoring to respond bridge draw hoist cable damage and do not need interact, thus test obtains the degree that bridge draws hoist cable to damage, by degree of injury signal after amplifier amplifies, send to described signal A/D converter, signal A/D converter is treated sends to PC, and PC carries out acquisition process.
7. the master according to claim 6 passive waveguide monitoring bridge sensing device monitoring method of drawing hoist cable to damage, is characterized in that: described clip is cylindrical clip.
8. the master according to claim 6 passive waveguide monitoring bridge sensing device monitoring method of drawing hoist cable to damage, is characterized in that: the spacing of adjacent two first cuttings of described 5 road first cuttings is 15 ~ 25mm; Described each second groove depth is 3 ~ 4mm, and length is 20 ~ 30mm; The width of described wire casing is 5 ~ 10mm; Described thickness of insulating layer is 0.1 ~ 0.3mm; The thickness of electro-magnetic screen layer is 0.5 ~ 2mm.
9. the master according to claim 6 passive waveguide monitoring bridge sensing device monitoring method of drawing hoist cable to damage, is characterized in that: described insulation course is the thin adhesive tape of thermosetting imines; Described electro-magnetic screen layer is superelevation conductive silicon rubber.
10. the master according to claim 6 passive waveguide monitoring bridge sensing device monitoring method of drawing hoist cable to damage, is characterized in that: described piezoceramic transducer adopts cementing agent to be fixed in the first cutting or the second cutting.
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| CN106770481B (en) * | 2016-12-14 | 2023-04-14 | 吉林省公路管理局 | Bridge sling monitoring sensor |
| CN106770672A (en) * | 2017-01-16 | 2017-05-31 | 南京邮电大学 | The engineering structure damage appraisal procedure of the passive monitoring information fusion of Lamb wave master |
| CN109490421A (en) * | 2018-12-18 | 2019-03-19 | 中国工程物理研究院化工材料研究所 | Anti-interference noise-reducing design method suitable for Piezoelectric acoustic emission monitor(ing) sensor |
| CN110596245B (en) * | 2019-10-16 | 2021-11-02 | 交通运输部公路科学研究所 | Active guided wave array sensor for inhaul cable defects and detection method |
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