CN105606275A - Online monitoring system and method for core plate of membrane filter board - Google Patents
Online monitoring system and method for core plate of membrane filter board Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims abstract description 105
- 230000006378 damage Effects 0.000 claims abstract description 74
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 211
- 230000036541 health Effects 0.000 claims description 27
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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Abstract
The invention relates to an online monitoring system and a method for a core plate of a membrane filter board, and the system comprises an optical fiber grating demodulator, an optical fiber coupler, a processor and an optical fiber grating sensor assembly, wherein the optical fiber grating sensor assembly is arranged in the core plate, a light source generates an optical signal, the optical signal is transmitted to the optical fiber grating sensor assembly through the optical fiber coupler, after the optical signal is interacted with the optical fiber grating, a reflected light gets in the optical fiber grating demodulator through the optical fiber coupler, the optical fiber grating demodulator is connected with the processer, the processer calls a core plate damage database to analyze the damage degree, then establishes a 3D model and outputs the damage distribution of the core plate. According to the method, the system and the method provided by the invention can assess the healthy condition of the core plate and publish an early warning in time, the core plate fault and hidden danger can be accurately and quickly eliminated, the safety incident and production loss can be avoided, and the benefits of the equipment manufacturers and the users can be ensured.
Description
Technical field
The present invention relates to a kind of central layer on-line monitoring system and method for membrane filter plate.
Background technology
Chamber Type Diaphragm Filter Press has that squeeze pressure is high, good corrosion resistance, the advantage such as easy to maintenance, safe and reliable, be metallurgical,Papermaking, pharmacy, food, brewage, the first-selection of the industry such as mud.
Chamber-type press filter is a kind of pressure filtration facility of intermittently operated, needs continuous loading and unloading. And in actual workDo in environment, filter plate both sides pressure is may be serious under the extraordinary operating modes such as line clogging unbalanced or because filter cloth breakage is ledCause the impact that filter plate is directly subject to slip. Like this, filter plate is in being periodically frequently subject to the state of dynamic load outside non-uniform face,Thereby more worsen its carrying environment. In use, filter plate all can exist the phenomenon of fatigue cracking in varying degrees.
The operation principle of Chamber Type Diaphragm Filter Press is that the common chamber filter plate of some and membrane filter plate are under the effect of strong mechanical forceClosely rearranged alternately filter chamber, under the pressure-acting of dehvery pump, filter pulp is inputted to filter chamber, will be filtered by filter medium filter clothSolid in slurry and fluid separation applications. After normal filtration, compressed media (as gas, water) enters the crushing chamber of membrane filter plateEardrum dwindles filter chamber volume, thereby to further compacting filter cake of both sides extruding filter cake. The membrane filter plate of Chamber Type Diaphragm Filter Press comprisesThe upper and lower two-layer barrier film of main body central layer and central layer, main body central layer mainly plays the effect of rigid support.
But impaired filter plate is investigated in production scene wastes time and energy, rely on for a long time experienced operator's experience accumulation, and fault rowLook into also and can only after the situation that irremediable loss occurs, just can carry out. The filter plate damaging continues in unwitting situationWork may cause great damage to whole equipment. Like this, the health monitoring technology of filter plate usage is outstanding for filter press filter boardFor important, it is carried out to health monitoring under usage state to ensure safety in production, in-problem filter plate is carried out to real-time early warning,Realize in advance malfunction elimination, extended to a certain extent the safe operating life of filter plate. Meanwhile, also can analyze from collection in worksiteThe filter plate usage status data that record is preserved judges that whether user exists unlawful practice in operating process, avoids establishing effectivelyProduct quality dispute problem between standby producer and client. In addition, contribute to filter press from being automated to intelligentized technology upgrading.
Conventional health monitor method is mainly the mode with some nondestructive inspections, comprises ray, ultrasonic, infrared, eddy current, micro-Ripple, laser hologram photography technology, visual detection etc. The feature of these traditional lossless detection methods is off-line, static state, passive.Up to the present, be subject to the restriction of many-sided technology and sensor condition, filter press filter board usage state is carried out not yet to be appearred in ChinaThe technology of monitoring.
Summary of the invention
The present invention, in order to address the above problem, has proposed a kind of central layer on-line monitoring system and method for membrane filter plate, energy of the present inventionEnough realize the filter plate that dynamic real non-destructive detects filter press and use state, calculate the residual intensity of filter plate, and security to filter plateEstimate with remaining life, improve service efficiency, the safe running performance of filter press, reduce maintenance cost, contribute toFilter press is from being automated to intelligentized technology upgrading.
To achieve these goals, the present invention adopts following technical scheme:
A central layer on-line monitoring system for membrane filter plate, comprises fiber Bragg grating (FBG) demodulator, fiber coupler, processor and optical fiberGrating sensor assembly, wherein, fiber-optic grating sensor assembly is arranged in central layer, and light source sends optical signal, and optical signal passes throughFiber coupler is transferred to fiber-optic grating sensor assembly, and after optical signal and fiber grating interact, reverberation is through optical fiber couplingClose device and enter fiber Bragg grating (FBG) demodulator, fiber Bragg grating (FBG) demodulator connects processor.
Described processor calls membrane filter plate central layer damage data storehouse, analyzes degree of injury, sets up threedimensional model, output central layerDamage distributes, the health condition of assessment central layer.
Further, described fiber coupler has two, and optical signal is divided into two-way, is transferred to respectively by a fiber couplerThe two ends of fiber-optic grating sensor assembly, form two ports.
Further, described optical signal is transferred to one end of fiber-optic grating sensor assembly by a fiber coupler, forms oneThe individual port that has light incident and reflection concurrently.
Preferably, the built-in light source that described light source is fiber Bragg grating (FBG) demodulator, produces continuous frequency modulation laser, and laser signal is by drawingLine enters fiber grating, forms stable reflected signal.
Described fiber-optic grating sensor assembly, comprises the fiber grating pair sensor insert of some row, described fiber grating pair sensingDevice inserts, comprises optical fiber temperature grating and strain fiber grating, and optical fiber temperature grating is used for measuring temperature, and strain fiber grating is usedCarry out monitor strain, parallel with strain fiber grating, the adjacent arrangement of optical fiber temperature grating, the each temperature light in optical fiber temperature gratingGrid unit is corresponding one by one with each strain raster unit of strain fiber grating, thereby makes optical fiber temperature and adjacent strain optical fiber groupBecome a fiber grating pair.
Described optical fiber temperature grating and strain fiber grating should be spaced apart in the time of parallel, adjacent arrangement, to avoid temperatureThe material that the local strengthening phenomenon that the hard capillary of fiber grating outside produces in filter plate affects strain fiber grating test section becomesShape. Article two, the normal distance of parallel optical fiber is 5-12mm, preferably 10mm.
Described fiber grating pair sensor insert is fixed on filter sheet core board mold inner chamber, in mold pressing or injection moulding process and central layer oneBody formed. In forming process, the end of inserts can extend to the sidewall of dies cavity, ensures that the fiber grating pair in inserts passesSensor can be drawn easily and be protected reliably from central layer.
The end of described fiber grating pair sensor insert is provided with the joints of optical fibre, if be distributed with in fiber grating pair sensor insertA dry bar-shaped support, to realize location in mould of in mold pressing, injection molding process inserts and fixing.
Described fiber grating pair sensor adopts thermoplastic encapsulation, and the preferably thermoplastic identical with core material, by coreIn plate structure, bury with burying the one or both ends of joint pre-installation at encapsulating mould in double-core optical fiber connector, fiber grating is opposite toIn encapsulating mould, in mould, pour into a mould thermoplastic melt, the end that cooling rear die sinking obtains thermoplastic encapsulation withThe fiber grating pair sensor insert of double-core optical fiber connector.
Further, described bar-shaped support matches with installing hole default on central layer mould, also can be by the end of bar-shaped supportBe adhesively fixed on and on mould, realize the location of inserts in mould and fixing.
Described fiber grating pair sensor insert can be that unidirectional lead-in wire can be also two-way lead-in wire, can comprise multiple being carved with notThe raster unit of concentricity wavelength, each raster unit is all independently sensor units. Can be only to grid region encapsulation, alsoCan be to burying part encapsulation in whole fiber grating pair. Like this, the fiber grating pair after encapsulation can be the single grid of unidirectional lead-in wireThe right block fiber grating pair sensor insert in district, the multiple grid regions of unidirectional lead-in wire are block and two-way lead-in wire to bar-shaped, two-way lead-in wireBar-shaped fiber grating pair sensor insert.
In the described joints of optical fibre comprise, be embedded in membrane filter plate central layer frame in bury joint, block head and external connector three parts,In in central layer forming process, bury joint one end with in the fiber grating pair sensor that buries be connected, one end coordinates with block head, in mouldingRear central layer, after follow-up machining, is removed block head, by interior fiber grating pair sensor and the external connector burying in jointOptical fiber connect, realize the fiber grating pair sensor that is embedded in central layer inside and be connected with (FBG) demodulator.
Described processor comprises that fiber grating signal resolution module, central layer damage data library module, CAD MBM, CAE haveFinite element analysis module, the healthy total evaluation module of central layer and demonstration output module, wherein, described fiber grating signal resolution module,The signal gathering for resolving fiber Bragg grating (FBG) demodulator; Described central layer damage data library module, for storing central layer damage data;Described CAD MBM, for setting up the 3-D geometric model of central layer; Described CAE finite element analysis module, for emulation meterCalculate central layer degree of injury; The healthy total evaluation module of described central layer, for being good for according to the damage distribution situation assessment central layer of central layerHealth situation; Described demonstration output module, for showing 3-D geometric model and the health condition of central layer.
Described fiber coupler is fiber grating signal coupler, has good wavelength selective power and the characteristic of multiport, isCompact conformation, loss are little, the fiber coupler of polarization irrelevant.
Described fiber Bragg grating (FBG) demodulator is middling speed or high speed optic fiber grating wavelength (FBG) demodulator, has the demodulation scheme of multi-channel parallel,Realize signal fast demodulation, meet health monitoring needs, can the grating signal of fast demodulation filter plate under working environment.
Described LASER Light Source, fiber coupler, fiber grating pair sensor all connect by optical fiber, fiber Bragg grating (FBG) demodulator and lightFine coupler connects by optical fiber, and signal transmission is optical signal, and fiber Bragg grating (FBG) demodulator is connected by data wire with processor, passesDefeated signal is data signal.
Based on a method for above-mentioned monitoring system, comprise the following steps:
(1) need to scribe raster unit according to the structure of membrane filter plate central layer and monitoring, and to each raster unit numbering, choosingSelect two fiber gratings and set up fiber grating pair;
(2) adopt thermoplastic melt cast to burying joint in fiber grating pair sensor and double-core optical fiber connectorMode encapsulates in encapsulating mould, obtains fiber grating pair sensor insert;
(3) adopt mold pressing or Shooting Technique to prepare membrane filter plate central layer, realize membrane filter plate central layer and fiber grating pair sensorInserts one-body molded;
(4) connect respectively burying joint in the double-core optical fiber connector of the one or both ends of each fiber grating pair sensor insertConnect the corresponding ports of fiber coupler, fiber coupler is by optical fiber incoming fiber optic grating demodulation instrument, and fiber Bragg grating (FBG) demodulator passes throughData wire connects signal processor, and signal processor is resolved the signal that fiber Bragg grating (FBG) demodulator gathers, and solves membrane filter plate central layer temperatureDegree, strain and stress;
(5) set up the 3-D geometric model of membrane filter plate central layer, utilize finite element method to calculate the damage of membrane filter plate central layerDegree, judges whether central layer occurs damage, if there is damage, judges damage position and degree of injury, output damage, and thenEvaluate central layer health degree.
In described step (3), before the mold pressing of membrane filter plate central layer or injection mo(u)lding, in dies cavity according to encapsulation after lightThe default installing hole of bar-shaped supported amount of fine grating pair sensor insert, by bar-shaped support and the mould of fiber grating pair sensor insertInstalling hole default in tool inner chamber coordinates, or bar-shaped supporting base end portion viscose glue is connect and fixedly realizes inserts fixing in mould; By embeddingIn the joints of optical fibre of part end, burying joint coordinates with block head; After the mold pressing of membrane filter plate central layer or injection mo(u)lding, by unnecessaryThe bar-shaped support that remains in the fiber grating pair sensor insert of central layer outside is removed, and by smooth central layer surface finish.
In described step (5), concrete steps comprise:
(5-1) utilize CAD modeling software to set up the 3-D geometric model of central layer, and import CAE finite element analysis software, drawDivide grid, set up FEM model;
(5-2), according to locus corresponding relation, set up unit e in FEM modelxkjCorresponding relation with raster unit xkj:The temperature of grating measuring, strain and stress are mapped in FEM model, carry out temperature field and the stress of central layerThe finite element modelling of strain field;
(5-3) processor receives the signal that fiber Bragg grating (FBG) demodulator transmission comes, and adds up dead grating numbering;
(5-4) the grating xkj signal receiving is processed to corresponding damage data model pair in rear and central layer damage data storehouseRatio, whether the central layer of diagnosis grating cell position there is damage and degree of injury, set up raster unit and central layer degree of injury itBetween relation: xkj → d(xkj)；
(5-5) integrating step (5-2), (5-4), the raster unit group obtaining in FEM model damages in health monitoring processHinder the variation relation of degree: e(xkj)→d(xkj), gained in the finite element modelling result of comparative analysis degree of injury and step (5-4)Diagnostic result, abundant, to optimize central layer damage data storehouse, then exports the distribution of central layer degree of injury by cloud atlas;
(5-6) according to degree of injury, estimate security and the service life of central layer, give the alarm in time, improve the usage of central layerSecurity.
In described step (5), the processing of double lead grating signal has selectively: when optical fiber is intact, it is same that processor receivesTwo lead signal of grating are identical, and only one end lead-in wire signal transmission is processed in processing; If fibercuts, two ends lead-in wire transmission letterNumber difference, processor need to be processed two end signals simultaneously.
Beneficial effect of the present invention is:
(1) the invention provides a kind of online health monitoring systems of central layer and method of membrane filter plate, realized membrane filter plate coreThe real time on-line nondestructive monitoring of plate under complex working condition, this monitoring system and method are the filter press filter board production technologies based on ripe,Exploitativeness is strong, is easy to realize in large-scale production.
(2) the invention provides the online health monitoring of central layer damage position and the degree of injury of visual output membrane filter plateThe method of system and signal processing, and issue in time early warning, contribute to accurately to get rid of fast filter plate fault and potential safety hazard, keep awayExempt from security incident and production loss, ensure device fabrication producer and user both sides' interests.
Brief description of the drawings
The structural representation of the two-way wire fiber Bragg of Fig. 1 thin rod shape grating pair sensor insert;
The structural representation of the unidirectional wire fiber Bragg of Fig. 2 thin rod shape grating pair sensor insert;
The online health monitoring systems schematic diagram of the central layer of a kind of upper feeding barrier diaphragm filter plate of Fig. 3;
The online health monitoring systems schematic diagram of the central layer of a kind of middle feedstock diaphragm filter panel of Fig. 4.
1 fiber-optical grating temperature sensor; 2 fiber Bragg grating strain sensors; In 3 joints of optical fibre, bury twin-core joint; 4 optical fibersGrid are to the bar-shaped support of sensor insert; 5 central layer upper feeding holes; 6 two-way lead-in wire thin rod shape fiber grating pair sensor insert; 7 pressSqueeze gas, water inlet hole; 8 cross-drilled holes; Charging hole in 9 central layers; 10 unidirectional lead-in wire thin rod shape fiber grating pair sensor insert.
Detailed description of the invention:
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
The online health monitoring systems of central layer of membrane filter plate, comprise fiber Bragg grating (FBG) demodulator, fiber coupler, processor andBe applicable to fiber grating pair sensor insert and the core plate structure of the shaft-like encapsulation of polypropelene fine of central layer mold pressing, injection molding processInside bury and use double-core optical fiber connector. Process is that light source or fiber Bragg grating (FBG) demodulator built-in light source send optical signal, optical signal separatelyBe divided into two-way through optical fiber and be transferred to fiber grating pair by two of left and right sides fiber coupler or an one-sided fiber couplerThe two ends of sensor or one end, form two or one ports that have light incident and reflection concurrently, pre-fixes in central layer mouldThe fiber grating pair sensor insert of the shaft-like encapsulation of polypropelene fine in chamber is one-body molded with central layer in mold pressing or injection moulding process, lightAfter signal and fiber grating pair interact, reverberation enters fiber Bragg grating (FBG) demodulator, fiber grating demodulation through fiber couplerInstrument connects processor, and processor calls central layer damage data storehouse, analyzes degree of injury, sets up threedimensional model, the damage of output central layerWound distributes, the health condition of assessment central layer.
Fiber grating pair sensor insert comprises two fiber gratings, i.e. an optical fiber temperature grating and a strain fiber grating,Optical fiber temperature grating is used for measuring temperature, and strain fiber grating is used for monitor strain, and optical fiber temperature grating and strain fiber grating are flatCapable, adjacent arrangement, the each temperature raster unit in optical fiber temperature grating and each strain raster unit one of strain fiber gratingOne correspondence, thus make optical fiber temperature and an adjacent fiber grating pair of strain optical fiber composition.
Described optical fiber temperature grating and strain fiber grating should be spaced apart in the time of parallel, adjacent arrangement, preferably 10mm,Affect the test of strain fiber grating with the local strengthening phenomenon of avoiding the hard capillary of optical fiber temperature grating outside to produce in central layerThe material deformation in district. Described fiber grating pair sensor insert has adopted the polypropylene encapsulation technology of fiber grating pair sensor,Made encapsulation grid region to or whole in bury the sensor insert with bar-shaped support of part, ensure fiber grating pair sensorIn the mold pressing of central layer, injection molding process, can effectively fix and not be molded or injection pressure destroys.
Fiber grating pair sensor insert in the mold pressing of central layer, injection molding process be fixedly bar-shaped support by inserts withAnd default installing hole is realized in the mould of mold pressing, injection moulding central layer, also can be by bonding at the bar-shaped supporting base end portion of insertsBe fixed on and on mould, realize the location of inserts in mould and fixing.
The polypropylene encapsulation technology of fiber grating pair sensor is pre-by burying in core plate structure with burying joint in double-core optical fiber connectorBe arranged on the one or both ends of encapsulating mould, fiber grating is opposite in encapsulating mould, in mould, pours into a mould melt polypropylene, coldBut after, die sinking obtains the end of polypropylene encapsulation with the fiber grating pair sensor insert of double-core optical fiber connector. Encapsulating mouldCan make the shaft-like inserts that can form with bar-shaped support.
Optical fiber can be that unidirectional lead-in wire can be also two-way lead-in wire, can comprise multiple raster units that are carved with different centre wavelengths,Each raster unit is all independently sensor units. Can only encapsulate grid region, also can be in whole fiber gratingBury part encapsulation. Like this, the fiber grating pair after encapsulation can be the right block fiber grating pair sensing in the single grid region of unidirectional lead-in wireDevice inserts, the multiple grid regions of unidirectional lead-in wire are the block and bar-shaped fiber grating pair sensor insert of two-way lead-in wire to bar-shaped, two-way lead-in wire.
In core plate structure, bury in comprising with double-core optical fiber connector, be embedded in central layer frame in bury joint, block head and external connector threePart. In in central layer forming process, bury joint one end with in the fiber grating pair sensor that buries be connected, one end coordinates with block head,Central layer after moulding, after follow-up machining, is removed block head, by interior bury fiber grating pair sensor in joint withThe optical fiber of external connector connects, and the fiber grating pair sensor that realization is embedded in central layer inside is connected with fiber coupler.
Light source can also can be built in fiber Bragg grating (FBG) demodulator for arbitrary source, produces continuous frequency modulation laser, and laser signal is logicalCross lead-in wire and enter fiber grating, form stable reflected signal.
Processor comprises fiber grating signal resolution module, central layer damage data library module, CAD MBM, CAE finite elementAnalysis module, the healthy total evaluation module of central layer and demonstration output module, wherein, described fiber grating signal resolution module, usesIn the signal of resolving fiber Bragg grating (FBG) demodulator collection; Described central layer damage data library module, for storing central layer damage data; InstituteState CAD MBM, for setting up the 3-D geometric model of central layer; Described CAE finite element analysis module, for calculating central layerDegree of injury; The healthy total evaluation module of described central layer, for the health condition of the assessment filter plate that distributes according to the damage of central layer; InstituteState demonstration output module, for showing 3-D geometric model and the health condition of central layer.
Fiber coupler is fiber grating signal coupler, has good wavelength selective power and the characteristic of multiport, is structureCompact, loss is little, the fiber coupler of polarization irrelevant.
Fiber Bragg grating (FBG) demodulator is middling speed or high speed optic fiber grating wavelength (FBG) demodulator, has the demodulation scheme of multi-channel parallel, realizesSignal fast demodulation, meets health monitoring needs, can the grating signal of fast demodulation filter plate under working environment.
LASER Light Source, fiber coupler, fiber grating pair sensor all connect by optical fiber, fiber Bragg grating (FBG) demodulator and optical fiber couplingClose device and connect by optical fiber, signal transmission is optical signal, and fiber Bragg grating (FBG) demodulator is connected by data wire with processor, transmission letterNumber be data signal.
A method for the online health monitoring of central layer of membrane filter plate, comprises the following steps:
(1) select optical fiber, need to scribe grating according to the structure of membrane filter plate central layer and monitoring, every optical fiber can be scribed manyIndividual raster unit, and to each raster unit numbering, lead-in wire can be drawn from the one or both ends of sensor, form single lead-in wire orDouble lead fiber grating string, and the temperature coefficient of grating is demarcated;
(2) select two fiber gratings to set up fiber grating pair, a fiber grating is used for measuring temperature, is labeled as T, anotherBar fiber grating monitor strain, is labeled as S, the equal overcoat sleeve pipe of grating of mark T, mouth of pipe rubber seal;
(3) mode that adopts melt polypropylene to pour into a mould to burying joint in fiber grating pair sensor and double-core optical fiber connectorEncapsulate, obtain fiber grating pair sensor insert;
(4), before the central layer mold pressing or injection mo(u)lding of membrane filter plate, in dies cavity, pass according to the fiber grating pair after encapsulationThe default installing hole of bar-shaped supported amount of sensor inserts, by pre-in the bar-shaped support of fiber grating pair sensor insert and dies cavityIf installing hole coordinate, also bar-shaped supporting base end portion can be bonded in and in mould, realize the location of inserts in mould and fixing; WillIn the joints of optical fibre of inserts end, burying joint coordinates with block head;
(5) adopt mold pressing or Shooting Technique to prepare central layer, realize the one-body molded of central layer and fiber grating pair sensor insert;After central layer mold pressing or injection mo(u)lding, the bar-shaped support of the unnecessary fiber grating pair sensor insert that remains in central layer outside is removed,And by smooth central layer surface finish;
(6) central layer after moulding is being removed block head after follow-up machining, each fiber grating pair sensor insertOne or both ends double-core optical fiber connector in bury the corresponding ports that joint connects respectively fiber coupler, fiber coupler is logicalCross optical fiber incoming fiber optic grating demodulation instrument, fiber Bragg grating (FBG) demodulator connects signal processor by data wire, and signal processor is resolvedThe signal that fiber Bragg grating (FBG) demodulator gathers, solves central layer temperature, strain and stress;
(7) set up the 3-D geometric model of central layer, utilize finite element method to calculate the degree of injury of central layer, judge that central layer isNo appearance damage, if there is damage, judges damage position and degree of injury, output damage, and then evaluate central layer health degree.
(7-1) utilize CAD modeling software to set up the 3-D geometric model of central layer, and import CAE finite element analysis software, drawDivide grid, set up FEM model;
(7-2), according to locus corresponding relation, set up unit e in FEM modelxkjCorresponding relation with raster unit xkj:The temperature of grating measuring, strain and stress are mapped in FEM model, carry out temperature field and the stress of central layerThe finite element modelling of strain field;
(7-3) processor receives the signal that fiber Bragg grating (FBG) demodulator transmission comes, and adds up dead grating numbering;
(7-4) the grating xkj signal receiving is processed to corresponding damage data model pair in rear and central layer damage data storehouseRatio, whether the central layer of diagnosis grating cell position there is damage and degree of injury, sets up between raster unit and central layer degree of injuryRelation: xkj → d(xkj)；
(7-5) integrating step (7-2), (7-4), the raster unit obtaining in FEM model is damaged journey in health monitoring processThe variation relation of degree: e (xkj) → d (xkj), the middle gained of the finite element modelling result of comparative analysis degree of injury and step (7-4)Diagnostic result, abundant, to optimize central layer damage data storehouse, then exports the distribution of central layer degree of injury by cloud atlas;
(7-6) according to degree of injury, estimate security and the service life of central layer, give the alarm in time, improve the usage of central layerSecurity.
In step (7), the processing of double lead grating signal has selectively: when optical fiber is intact, and the same grating that processor receivesTwo lead signal identical, only one end lead-in wire signal transmission is processed in processing; If fibercuts, two ends lead-in wire signal transmission is notWith, processor need to be processed two end signals simultaneously.
Optical fiber Bragg raster (FiberBraggGrating, FBG) is a kind of counter stress, strain and temperature sensitive sensing element,Can realize the measurement of simple optical fiber to tens strain nodes, have that precision is high, volume is little, lightweight, the life-span long, reliabilityThe advantages such as high, corrosion-resistant, transmission range is long, can realize the measurement of the different kinds of parameters such as strain, stress, temperature, in following enforcementIn example, select optical fiber Bragg raster.
Embodiment mono-: a kind of online health monitoring device of central layer and method of upper feeding van-type membrane filter plate.
As shown in Figure 3, system comprises: the two-way wire fiber Bragg of thin rod shape grating pair sensor insert 6, fiber coupler,Optical fibre grating digital demodulation instrument, computer system etc.
As shown in Figure 1, each fiber grating two ends are equal for the two-way wire fiber Bragg of thin rod shape grating pair sensor insert 6 structuresLeaded, form two signalling channels, suffer after external force fracture, 1 double lead grating sensor can become 2 single lead-in wiresGrating sensor, grating can normally be worked, and ensures the stability of on-line monitoring process monitoring.
(1) according to upper feeding van-type membrane filter plate central layer size, scribe the optical fiber of 26 cladding diameter 40 μ m and scribe grating.On every optical fiber, scribe the raster unit of 10 different centre wavelengths, numbering 1-10.
(2) get two and scribed optical fiber composition fiber grating pair, and be numbered 1-13, temperature survey grating outer casing stainless steel steel pipe,Mouth of pipe rubber seal, is labeled as T, and strain grating marker is S.
(3) fiber grating pair is encapsulated, first will in double-core optical fiber connector, bury joint 3 pre-installations at two of encapsulating mouldEnd, is fixed on two optical fiber in shaft-like encapsulating mould, keeps the raster unit position correspondence of two optical fiber, and two optical fiber are 10mm apart,The lead-in wire at fiber grating pair sensor two ends with in the fixing double-core optical fiber connector in dies cavity two ends, bury joint 3 and be connected.In mould, pour into a mould melt polypropylene, cooling rear die sinking obtains the fiber grating pair of shaft-like end with double-core optical fiber connectorSensor insert 6.
(4) at central layer mold pressing or injection mold surface of internal cavity according to the quantity of the bar-shaped support 4 of the fiber grating pair after shaft-like encapsulationDefault installing hole. The bar-shaped support 4 of shaft-like fiber grating pair sensor insert is coordinated with installing hole default on mould. By embeddingIn the joints of optical fibre of part end, burying joint coordinates with block head.
(5) adopt mould pressing process to prepare van-type membrane filter plate central layer, realize membrane filter plate central layer and shaft-like fiber grating pair sensorInserts one-body molded.
(6) after the compression molding of van-type membrane filter plate central layer, by the unnecessary fiber grating pair sensor insert that remains in central layer outsideBar-shaped support 4 is removed and polishes flat.
(7) central layer after moulding is being removed block head after follow-up machining, each double-core optical fiber connector at two endsInside bury the corresponding ports that joint connects respectively fiber coupler, fiber coupler is by optical fiber incoming fiber optic grating demodulation instrument, optical fiberGrating demodulation instrument connects computer by netting twine, has the health monitoring systems software of processing fiber grating data in computer, and how much three-dimensionalModeling, output display damage distributes.
The online health monitoring device of central layer and the method for charging van-type membrane filter plate in 21 kinds of embodiment
As shown in Figure 4, system comprises: the unidirectional wire fiber Bragg of thin rod shape grating pair sensor insert, thin rod shape is two-way drawsLine Double fiber Bragg gratings sensor insert, fiber coupler, optical fibre grating digital demodulation instrument, computer system etc.
As shown in Figure 2, each fiber grating only has one end to the unidirectional wire fiber Bragg of thin rod shape grating pair encapsulation inserts 10 structuresLead-in wire, convenient the arranging around the charging hole of membrane filter plate central layer middle position of fiber grating of unidirectional lead-in wire.
(1) charging van-type membrane filter plate central layer shape and structure feature and size in basis, scribe 22 two-way lead-in wire cladding diametersThe optical fiber of 40 μ m is scribed grating. On every optical fiber, scribe the raster unit of 10 different centre wavelengths, numbering 1-10. Get two quartersMake optical fiber composition fiber grating pair, and be numbered 1-11, temperature survey grating outer casing stainless steel steel pipe, mouth of pipe rubber seal, markFor T, strain grating marker is S.
(2) optical fiber of scribing 8 unidirectional lead-in wire cladding diameter 40 μ m is scribed grating. On every optical fiber, scribe 5 not concentricity ripplesLong raster unit, numbering 1-5. Get two and scribed optical fiber composition fiber grating pair, and be numbered 12-15, temperature survey lightGrid outer casing stainless steel steel pipe, mouth of pipe rubber seal, is labeled as T, and strain grating marker is S.
(3) two-way wire fiber grating pair is encapsulated, will in double-core optical fiber connector, bury joint pre-installation at encapsulating mouldTwo ends, will be numbered two optical fiber of 1-11 and be fixed in thin rod shape encapsulating mould, keep the raster unit position correspondence of two optical fiber,Two optical fiber are at a distance of 10mm, the lead-in wire at fiber grating pair sensor two ends with at the fixing double-core optical fiber connector in dies cavity two endsInside burying joint connects. In mould, pour into a mould melt polypropylene, cooling rear die sinking obtains the two-way lead-in wire of thin rod shape end with twin-coreThe fiber grating pair sensor insert 6 of the joints of optical fibre.
(4) unidirectional wire fiber grating pair is encapsulated, will in double-core optical fiber connector, bury joint pre-installation at encapsulating mouldOne end, is fixed on two optical fiber that are numbered 12-15 in thin rod shape encapsulating mould, keeps the raster unit position correspondence of two optical fiber,Two optical fiber are at a distance of 10mm, the lead-in wire of fiber grating pair sensor one end with at the fixing double-core optical fiber connector in dies cavity one endInside burying joint connects. In mould, pour into a mould melt polypropylene, cooling rear die sinking obtains the unidirectional lead-in wire of thin rod shape end with twin-coreThe fiber grating pair sensor insert 10 of the joints of optical fibre.
(5) end of bar-shaped fiber grating pair after shaft-like encapsulation support 4 is bonded in and on mould, realizes its fixing in mould.Central layer middle position charging hole around arrange unidirectional wire fiber grating pair sensor insert 10. The optical fiber of inserts end is connectedIn device, burying joint coordinates with block head.
(6) adopt mould pressing process to prepare van-type membrane filter plate central layer, realize membrane filter plate central layer and shaft-like fiber grating pair sensorInserts one-body molded.
(7) after the compression molding of van-type membrane filter plate central layer, by the unnecessary fiber grating pair sensor insert that remains in central layer outsideBar-shaped support is removed and is polished flat.
(8) central layer after moulding is being removed block head after follow-up machining, burying and connect in each double-core optical fiber connectorHead connects respectively the corresponding ports of fiber coupler, and fiber coupler is by optical fiber incoming fiber optic grating demodulation instrument, fiber grating solutionAdjust instrument to connect computer by netting twine, in computer, unsoundness monitoring system software is processed fiber grating data, three-dimensional modeling, and output is aobviousShow that damage distributes.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned, not the limit to protection domain of the present inventionSystem, one of ordinary skill in the art should be understood that on the basis of technical scheme of the present invention, those skilled in the art do not need to payGo out various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (10)
1. a central layer on-line monitoring system for membrane filter plate, is characterized in that: comprise fiber Bragg grating (FBG) demodulator, fiber coupler,Processor and fiber-optic grating sensor assembly, wherein, fiber-optic grating sensor assembly is arranged in central layer, and light source sends optical signal,Optical signal is transferred to fiber-optic grating sensor assembly by fiber coupler, after optical signal and fiber grating interact, and reverberationEnter fiber Bragg grating (FBG) demodulator through fiber coupler, fiber Bragg grating (FBG) demodulator connects processor.
2. the central layer on-line monitoring system of a kind of membrane filter plate as claimed in claim 1, is characterized in that: described optical signal passes throughA fiber coupler is transferred to one end of fiber-optic grating sensor assembly, forms a port that has light incident and light reflection concurrently.Described fiber coupler has one or two, and optical signal is divided into a road or two-way, respectively by one or two optical fiber couplingsClose device and be transferred to one end or the two ends of fiber-optic grating sensor assembly, form one or two ports.
3. the central layer on-line monitoring system of a kind of membrane filter plate as claimed in claim 1, is characterized in that: described fiber grating passesSensor assembly, comprises the fiber grating pair sensor insert of some row, and described fiber grating pair sensor insert, comprises temperature lightFine grating and strain fiber grating, optical fiber temperature grating is used for measuring temperature, and strain fiber grating is used for monitor strain, temperature lightParallel with strain fiber grating, the adjacent arrangement of fine grating, each temperature raster unit and strain optical fiber in optical fiber temperature gratingEach strain raster unit of grid is corresponding one by one.
4. the central layer on-line monitoring system of a kind of membrane filter plate as claimed in claim 3, is characterized in that: described fiber grating pairSensor insert is fixed on the dies cavity of central layer, one-body molded with central layer in mold pressing or injection moulding process.
5. the central layer on-line monitoring system of a kind of membrane filter plate as claimed in claim 3, is characterized in that: described fiber grating pairThe end of sensor insert be provided with the joints of optical fibre in bury joint, in fiber grating pair sensor insert, be distributed with that several are bar-shapedSupport, to realize location in mould of in mold pressing, injection molding process inserts and fixing, described bar-shaped support and central layer mouldOn tool, default installing hole matches or the end of bar-shaped support is adhesively fixed on mould.
6. the central layer on-line monitoring system of a kind of membrane filter plate as claimed in claim 5, is characterized in that: described fiber gratingSensor insert is prepared by thermoplastic encapsulation technology, will in core plate structure, be buried with in double-core optical fiber connectorBury the one or both ends of joint pre-installation at encapsulating mould, fiber grating is opposite in encapsulating mould, in mould, pours into a mould thermoplasticityPlastic melt, cooling rear die sinking obtains the end of thermoplastic encapsulation with the fiber grating pair sensing of double-core optical fiber connectorDevice inserts.
7. the central layer on-line monitoring system of a kind of membrane filter plate as claimed in claim 1, is characterized in that: described processor comprisesFiber grating signal resolution module, central layer damage data library module, CAD MBM, CAE finite element analysis module, central layerHealthy total evaluation module and demonstration output module, wherein, described fiber grating signal resolution module, for resolving fiber gratingThe signal that (FBG) demodulator gathers; Described central layer damage data library module, for storing central layer damage data; Described CAD MBM,For setting up the 3-D geometric model of central layer; Described CAE finite element analysis module, for simulation calculation central layer degree of injury; InstituteState the healthy total evaluation module of central layer, for assess the health condition of filter plate according to the damage distribution situation of central layer; Described demonstration is defeatedGo out module, for showing 3-D geometric model and the health condition of central layer.
8. a method for the monitoring system based on as described in any one in claim 1-7, is characterized in that: comprise the following steps:
(1) need to scribe raster unit according to the structure of the central layer of membrane filter plate and monitoring, and to each raster unit numbering,Select two fiber gratings to set up fiber grating pair;
(2) adopt thermoplastic melt cast to burying joint in fiber grating pair sensor and double-core optical fiber connectorMode encapsulates in encapsulating mould, obtains fiber grating pair sensor insert;
(3) adopt mold pressing or Shooting Technique to prepare membrane filter plate central layer, realize membrane filter plate central layer and fiber grating pair sensorInserts one-body molded;
(4) connect respectively burying joint in the double-core optical fiber connector of the one or both ends of each fiber grating pair sensor insertConnect the corresponding ports of fiber coupler, fiber coupler is by optical fiber incoming fiber optic grating demodulation instrument, and fiber Bragg grating (FBG) demodulator passes throughData wire connects signal processor, and signal processor is resolved the signal that fiber Bragg grating (FBG) demodulator gathers, and solves central layer temperature, strainAnd stress;
(5) set up the 3-D geometric model of the central layer of membrane filter plate, utilize finite element method to calculate the degree of injury of central layer,Judge whether central layer occurs damage, if there is damage, judges damage position and degree of injury, output damage, and then evaluate corePlate health degree.
9. method as claimed in claim 8, is characterized in that: in described step (3), at the mold pressing of membrane filter plate central layer or noteBefore molded, in dies cavity, preset installing hole according to the bar-shaped supported amount of the fiber grating pair sensor insert after encapsulation,The bar-shaped support of fiber grating pair sensor insert is coordinated with installing hole default in dies cavity, or bar-shaped supporting base end portion is stickyGlued joint and fixedly realize inserts fixing in mould; Coordinate with block head burying joint in the joints of optical fibre of inserts end; ?After central layer mold pressing or injection mo(u)lding, the bar-shaped support of the unnecessary fiber grating pair sensor insert that remains in central layer outside is removed,And by smooth central layer surface finish.
10. method as claimed in claim 8, is characterized in that: in described step (5), concrete steps comprise:
(5-1) utilize CAD modeling software to set up the 3-D geometric model of membrane filter plate central layer, and import CAE finite element analysisSoftware, grid division, sets up FEM model;
(5-2), according to locus corresponding relation, set up unit e in FEM modelxkjCorresponding relation with raster unit xkj:The temperature of grating measuring, strain and stress are mapped in FEM model, carry out temperature field and the stress of central layerThe finite element modelling of strain field;
(5-3) processor receives the signal that fiber Bragg grating (FBG) demodulator transmission comes, and adds up dead grating numbering;
(5-4) the grating xkj signal receiving is processed to corresponding damage data model pair in rear and central layer damage data storehouseRatio, whether the central layer of diagnosis grating cell position there is damage and degree of injury, set up raster unit and central layer degree of injury itBetween relation: xkj → d(xkj)；
(5-5) integrating step (5-2), (5-4), the raster unit group obtaining in FEM model damages in health monitoring processHinder the variation relation of degree: e(xkj)→d(xkj), gained in the finite element modelling result of comparative analysis degree of injury and step (5-4)Diagnostic result, abundant, to optimize central layer damage data storehouse, then exports the distribution of central layer degree of injury by cloud atlas;
(5-6) according to degree of injury, estimate security and the service life of central layer, give the alarm in time, improve membrane filter plate coreThe usage security of plate.
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