CN101544064B - Intelligent structure self-healing method and health monitoring system based on light repairing technology - Google Patents
Intelligent structure self-healing method and health monitoring system based on light repairing technology Download PDFInfo
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Abstract
The invention relates to an intelligent structure self-healing method and a health monitoring system, in particular to a brand-new intelligent structure self-healing and self-diagnostic method which utilizes solar energy and light-curing technology to realize damage self-healing of composite material and simultaneously realizes health monitoring on the basis of neural network and digital signal processing technologies. In the method, light-curing plasteringagent is taken as light-curing restoration agent and is arranged in tubular fibre coated with photomask agent and coupling agent; when material cracks, fibres at the front expansion edge of the crack rupture, and the light-curing restoration agent permeate into the damaged cracks and adopt sunlight as supply power resource to realize the self-healing of the damaged material; at the meantime, an optical fibre sensor used as a signalling and sensing element and a digital signal processing technology are combined to realize the status health monitor of the intelligent structure. The invention has the characteristics of strong practicality, low cost, environment protection, energy saving, and the like, and provides an effective solution for realizing the self-healing and the health monitor of composite material components.
Description
Technical field
A kind of novel intelligent structure self-healing method and health monitoring systems of the present invention based on light repairing technology; In conjunction with technology such as photocuring technology, optical fiber sensing technology, the structural mechanic of complex material and Digital Signal Processing; Utilize solar energy realized composite from callus; And combine neutral net and Digital Signal Processing to realize the health monitoring of composite structure, belong to a kind of brand-new intelligence structure selfreparing and self diagnosis.Especially the present invention propose with sunshine as energy supply; The photocuring renovation agent as the material of material supply from the callus solution, use widely for composite element is safer provide a kind of practical, cost is low, the effective way of environmental protection and energy saving.
Background technology
The composite that is widely used in aerospace field is because the diversity and the complexity of its component; In making machine-shaping and use, its surface and inside inevitably all kinds of defectives and damage can occur, especially; The generation and the expansion of micro-crack damage will cause the material monolithic performance decrease; Cause component failure, shorten the service life of material, consequence that then can bringing on a disaster property when serious.
Late 1980s, the U.S. and Japanese scientist incorporate bionics in the composite study, have proposed the new ideas of intelligence structure.Intelligence structure is meant from bionic viewpoint design and makes composite, makes material have the function of perception and selfreparing.At present, the intelligent self-repair material with self diagnosis, self-repair function has become one of research emphasis of field of new, and the core of selfreparing is energy supply and material supply, and its process is accomplished by the growth activity factor.The principle of mimic biology body wound healing makes composite can carry out selfreparing to inside or outer damage, thereby removes a hidden danger that the mechanical strength of reinforcing material increases the service life.
At present; Carrying out number of research projects aspect composite material health monitoring and the diagnosis both at home and abroad; And make certain gains; Method mainly is at material embedded set sensor array, and the inline diagnosis structure reaches owing to the distortion that external force, fatigue etc. produce, crackle damage etc. in processing, curing, shaping.Yet, also be in the starting stage for the research of intelligent composite damage selfreparing aspect.At present, the method for research use mainly contains: hot reversible crosslink reaction method, liquid core fibre method and microcapsule method.Hot reversible crosslink reaction method is mainly realized injury repair through the mode of heating, and other performances that this will damage material for example cause grain growth etc., and reparation speed is slow, and complex process is unfavorable for the application and the development of intelligence structure.Liquid core fibre method and microcapsule method are meant imbeds fiber or the microcapsules that comprise renovation agent in the intelligent composite matrix; Form intelligent bionical self-healing network in composite inner; When crackle appears in composite; Part liquid core fibre or microcapsules rupture, renovation agent flow out and infiltrate the crack, make the affected area healing to realize self-repair function.The employed renovation agent of existing literature data is two component adhesive; In the design renovation agent and catalyst are placed respectively in fiber (or capsule) and the matrices of composite material; After fiber (or capsule) breaks; Guarantee that renovation agent can touch catalyst, then the branch bulk density of catalyst in matrices of composite material must be enough big.Therefore, the service efficiency of catalyst is very low, and bigger catalyst concn also has certain influence to the performance of intelligent composite.Therefore, no matter be restorative procedure or repair materials, very big research and development space is all arranged, it is to be solved to exist a lot of problems to have.
Summary of the invention
In view of the problem that above-mentioned prior art exists, the objective of the invention is to develop a kind of intelligence structure with rapidly self-healing wound and real-time online health monitoring function.The sunshine that utilizes that is proposed is realized the light reparation intelligence structure of composite from callus; Adopt single-component photocureable binding agent and remediation intensification fiber as photocuring renovation agent and renovation agent carrier respectively, changed present use dual-component binder and microcapsules and carried out the deficiency that material damage is repaired, use the bi-component binding agent to realize the material selfreparing; Must depend on contact and reaction between the component; Must reduce the reliability of repairing like this, but also limit the restoring area of damage simultaneously, adopt the single-component photocureable binding agent not only to solve this problem; And it is fast fully to manifest the light-curing adhesive curing rate; Characteristics that can " solidify ", what make the intelligence structure developed is independent of the control system from the callus process, has type living body feature of " spontaneous " and " instinct " in good time.
The present invention adopts the mode of omnidirectional distribution that optical fiber is adhered to the intelligence structure surface simultaneously and forms sensing network; Be used to respond to deformation and damage information with transferring structure; Convert optical signal into the signal of telecommunication through opto-electronic conversion and amplifying circuit; Again the signal of telecommunication is transferred to digital signal processor, the signal that will pass through digital filtering at last is transferred to monitoring host computer, in monitoring host computer, monitors through the health status of neural network algorithm realization material structure.
1, technical problem
First technical problem that the present invention will solve is based on the research and the realization of the intelligent structure self-healing method of light repairing technology, wherein mainly comprises:
(1) preparation of photocuring renovation agent
The intelligence structure light restorative procedure that the present invention proposes, be with sunshine as energy supply, the photocuring renovation agent is as the material supply, therefore as the light-curing adhesive of renovation agent, its performance will produce directly from the callus effect composite structure to be influenced.Repair requirement for the light that satisfies intelligent structure self-healing, the light-curing adhesive that needs that a kind of curing rate of development is fast, viscosity is low, has good bonding intensity with composite is for material provides the material supply from callus;
(2) preparation of remediation intensification fiber coat and embedding
The remediation intensification fiber is as the carrier of photocuring renovation agent; To guarantee that photocuring reaction does not take place the photocuring renovation agent that is in fibrous inside on the one hand; To guarantee that on the other hand fiber and matrix have favorable compatibility, must study fiber coat and embedding volume ratio thereof for reaching this requirement.
Research and realization that second technical problem that the present invention will solve is the intelligence structure health monitoring systems wherein mainly comprise:
(1) sensing network, signal transmission and processing module
The sensing network of intelligence structure health monitoring systems and signal transmission and processing module relate to optical fiber sensing network, opto-electronic conversion and amplifying circuit, the design of digital signal processor and SCI-PC communication interface circuit.By the optical signal that carries configuration state information of optical fiber sensing network collection, must be through becoming the signal of telecommunication after the opto-electronic conversion, and through amplifying circuit, the supplied with digital signal processor is sent to the damage locating module through the SCI-PC communication interface again;
(2) damage locating module
The signal that comprises Intelligent Composite configuration state information is after filtering; Through the SCI-PC communication interface, be sent to the damage locating module, the damage locating module adopts Mathematical Modeling and algorithm that signal is handled; The health monitoring of implementation structure; And when damage appears in structure, judge damage position, carry out early warning.How accomplishing the location of damage position, is the research emphasis of health monitoring.
2, technical scheme
In order to solve above-mentioned technical problem, the present invention has adopted following technical scheme:
(1) photocuring renovation agent preparation process; Adopt the single-component photocureable binding agent as the photocuring renovation agent; The composition of single-component photocureable binding agent mainly comprises: prepolymer, light trigger and reactive diluent; The composition of said single-component photocureable binding agent has determined curing rate, adhesion strength and the viscosity of prepared photocuring renovation agent, specifically comprises the following steps:
Step 1: prepolymer---the epoxy acrylate of preparation photocuring renovation agent; Under catalyst action; With epoxy resin and acrylic acid is raw material, makes after 100 ℃ of constant temperature esterifications through 5 hours, and the viscosity of the epoxy acrylate of preparation in the time of 25 ℃ is 6800mPas;
Step 2: the photoinitiator system of preparation photocuring renovation agent; Different light triggers have different response wave lengths and light-initiated efficient, in this step, according to the ability spectrum signature of sunshine; Adopt spectroscopic analysis methods; With light trigger 2-hydroxy-2-methyl-1-phenylacetone with two 2,4,6-trimethylbenzoyl diphenyl phosphine oxide preparation in 1: 1 by mass percentage composite photoinitiator system;
Step 3: confirm the proportioning components of photocuring renovation agent, with prepolymer, reactive diluent and light trigger preparation in 15: 4: 1 by mass percentage photocuring renovation agent, the viscosity of prepared photocuring renovation agent in the time of 25 ℃ is 5983mPas.
(2) preparation of remediation intensification fiber coat and embedding.Specifically comprise the following steps:
The remediation intensification fiber is as the carrier of photocuring renovation agent; Volume ratio according to certain is imbedded material internal, and adopts photomask agent and coupling agent that it is carried out surface treatment, and photomask agent can guarantee that photocuring reaction does not take place the photocuring renovation agent of fibrous inside; And coupling agent can improve the interface performance between fiber and the matrix; Make fiber and matrix have favorable compatibility, this step adopts carbon black as photomask agent, and γ-glycidol ether propyl trimethoxy silicane is as coupling agent; The face coat of preparation remediation intensification fiber, and according to 15% the volume ratio embedding amount as fiber.
(3) use the energy supply of sunshine as intelligent structure self-healing, the photocuring renovation agent need not prepared the special-purpose light source of repairing as the material supply, only just can realize material rapidly self-healing wound by natural solar energy.
(4) to adopt optical fiber orthogonal arrangement mode be core processor with high speed digital signal processor (DSP) in the present invention; Be equipped with a series of processing such as peripheral opto-electronic conversion, voltage amplification, filtering, analog to digital conversion; Convert the output intensity signal of optical fiber sensing network to data-signal; And be equipped with the appropriate algorithm program and come real-time analysis, the different conditions of monitoring composite.In addition, message processing module has also been reserved Computer Communications Interface, so that carry out remote monitoring and system upgrade, for follow-up study provides the space.
(5) damage locating module.It is the process that a utilization mathematical modeling is described physical system that the Intelligent Composite structure is damaged location, diagnosis and assessment.The variation of configuration state will inevitably cause that the status flag of himself changes, and these characteristics are extracted in health monitoring exactly, and adopts corresponding Mathematical Modeling that structure is damaged identification.Neutral net has obtained significant progress with characteristics such as the non-linear and very strong self-learning capability of the distributed store of its information, MPP, height and good fault-tolerance, robustness in recent years.Utilize neutral net as the information processing instrument, can overcome the shortcoming of some damnification recognition method.Said damage locating module adopts the probabilistic neural network algorithm, and the damage location is handled and realized to the signal of intelligence structure state.
3, beneficial effect
Intelligent structure self-healing and health monitor method based on light repairing technology involved in the present invention; Have the special-purpose light source of repairing need not be provided; Only just can realize the characteristic that the material rapidly self-healing is hindered by natural solar energy; The performance that achievement in research can improve material greatly with prolong its service life, have environmental protection, characteristics such as energy-conservation and efficient, and can the integrated and lightness of implementation structure.The present invention is based on photocuring technology, proposed a kind of novel concept that adopts nature luminous energy to realize the material selfreparing, have superiority, for the selfreparing of intelligent composite structure and the research of self diagnosis provide a new solution than existing conventional method.
Description of drawings
Fig. 1 is based on the intelligent structure self-healing method of light repairing technology and health monitoring systems sketch map
Fig. 2 is the Experimental equipment of preparation prepolymer
Fig. 3 is the absorption spectrum of composite photoinitiator
Fig. 4 is the optical fiber sensing network module diagram
Fig. 5 is signal transmission and processing module circuit diagram
Fig. 6 is an intelligent structure self-healing process sketch map (early injury)
Fig. 7 is an intelligent structure self-healing process sketch map (injury repair)
Among the figure: 1. light source; 2. optical fiber sensing network module; 3. remediation intensification fiber; 301. fiber coat; 302. photocuring renovation agent; 4. signal transmits and processing module; 401. opto-electronic conversion and amplification; 402. analog-to-digital conversion; 403. signal is handled; 404. data communication; 5. damage locating module; 6. mixer; 7. there-necked flask; 8. separatory funnel; 9. water-bath; 10. crackle
The specific embodiment
Embodiment 1: Fig. 1 has provided the illustrative examples of an intelligent structure self-healing method of the present invention and health monitoring systems.As shown in Figure 1: as to the present invention includes: light source (1), optical fiber sensing network module (2), remediation intensification fiber (3), signal transmission and processing module (4) and damage locating module (5).
Wherein, remediation intensification fiber (3) comprising: fiber coat (301) and photocuring renovation agent (302); Signal transmission and processing module (4) comprising: opto-electronic conversion and amplification (401), analog-to-digital conversion (402), signal are handled (403) and data communication (404).
Embodiment 2: Fig. 2,3,6,7 have provided the embodiment of a schematic intelligent structure self-healing of the present invention.
In an embodiment; With epoxy resin and acrylic acid is raw material; At catalyst (N; The N-dimethyl benzylamine) under the effect, through 5 hours 100 ℃ of constant temperature esterifications prepare epoxy acrylic ester prepolymer (its viscosity is: 6800mPas (25 ℃)), as the base material (Experimental equipment that Fig. 2 prepares for prepolymer) of photocuring renovation agent; 2-hydroxy-2-methyl-1-phenylacetone) and light trigger TPO (chemical name: two 2 with light trigger 1173 (chemical name:; 4; 6-trimethylbenzoyl diphenyl phosphine oxide) (Fig. 3 is the absorption spectrum of composite photoinitiator by mass ratio preparation in 1: 1 complex light initiator system; Abscissa is a wavelength, and ordinate is an absorbance); With prepolymer (epoxy acrylate), reactive diluent (methyl methacrylate) and light trigger 2-hydroxy-2-methyl-1-phenylacetone) and light trigger TPO (chemical name: two 2 (by light trigger 1173 (chemical name:; 4; 6-trimethylbenzoyl diphenyl phosphine oxide) composite photoinitiator of preparation) 15: 4: 1 by mass percentage preparation photocuring renovation agents, the viscosity of prepared photocuring renovation agent in the time of 25 ℃ is 5983mPas;
Adopt carbon black and KH560 (chemical name: γ-glycidol ether propyl trimethoxy silicane) the remediation intensification fiber to be carried out the face coat processing respectively, and place reinforcing fiber inner the photocuring renovation agent as photomask agent and coupling agent.Invention adopts post processing and transfer method that fiber is imbedded in the matrices of composite material, and matrix material is an epoxy resin, imbeds volume ratio and adopts 15%, and Fig. 6 and Fig. 7 are from callus process sketch map.As shown in the figure when crackle (10) appears in structure, be in the stressed fracture of fiber in crackle forward position, photocuring renovation agent (302) flow to crackle (10) and locates, and under solar light irradiation, the photocuring renovation agent that infiltrates into crackle solidifies and bonding reparation crackle fast.
Embodiment 3: Fig. 4,5 have provided the embodiment of a concrete intelligence structure sensing of the present invention, signal transmission and processing module.
In an embodiment, Fig. 4 is the optical fiber sensing network module that adheres to the Intelligent Composite body structure surface according to omnidirectional distribution (among the figure: X
1～X
8Represent 8 sensor fibres of omnidirectional distribution respectively, this sensing network comprises 16 sensitive zones), be used to respond to deformation and damage information with transferring structure;
Fig. 5 transmits for signal and processing module (4) comprising: opto-electronic conversion and amplification (401), analog-to-digital conversion (402), signal are handled (403) and data communication (404).Opto-electronic conversion and amplification (401) adopt phototriode L-31ROPT1D2 (Q1), adjustable resistance (R1=28K Ω) and the current-limiting resistance (R2=20k Ω) of no base lead that the optical signal that carries structural health information is carried out opto-electronic conversion; Convert the photoelectric current of phototriode into voltage; Because the voltage of opto-electronic conversion output is not ideal enough, therefore adopt operating voltage be ± Voltage Series negative-feedback circuit that the dual-inline package four input integrated operational amplifier LM324 of 5V form amplifies the signal of telecommunication.Wherein, the feedback branch that the resistance R 5 that is respectively 51k Ω and 60k Ω by resistance and R6 form is used to reduce the non-linear distortion of amplifier; Balance resistance R3 gets R4//(R5+R6), is used to reduce the size of the input offset current of amplifier.Filter capacitor (C=2.2 μ F) is used to eliminate the power supply instability for circuit-formed interference.The multiplication factor of circuit is A=Vout/Vin=1+ (R5+R6)/R4;
Transfer to the ADCIN00 passage of built-in 10 analog-to-digital conversion modules (402) of digital signal processor TMS320LF2407 through the signal of telecommunication that amplifies; After in digital signal processor, accomplishing digital-to-analogue conversion and signal processing (403), adopt SCI-PC serial data communication (404) circuit to realize that the serial port of TMS320LF2407 and RS_232 carries out asynchronous communication.This circuit has adopted the chip for driving MAX232 that meets the RS_232 standard, carries out serial communication.The MAX232 chip comprises that by+5V power supply two are accepted and sendaisle, and has characteristics such as low in energy consumption, integrated level height.Because TMS320LF2407 employing+3.3V power supply, so between MAX232 and TMS320LF2407, add the typical level matching circuit of forming by diode D1 (1N5819) and three resistance (R7=10K Ω, R8=1K Ω, R9=2K Ω).
Claims (3)
1. the intelligent structure self-healing method based on light repairing technology is characterized in that, comprises the following steps:
First step: photocuring renovation agent preparation process; Adopt the single-component photocureable binding agent as the photocuring renovation agent; The composition of single-component photocureable binding agent mainly comprises: prepolymer, light trigger and reactive diluent, the composition of said single-component photocureable binding agent have determined curing rate, adhesion strength and the viscosity of prepared photocuring renovation agent;
Second step: the remediation intensification fiber is as the carrier of photocuring renovation agent; Volume ratio according to certain is imbedded material internal, and adopts photomask agent and coupling agent that it is carried out surface treatment, and photomask agent can guarantee that photocuring reaction does not take place the photocuring renovation agent of fibrous inside; And coupling agent can improve the interface performance between fiber and the matrix; Make fiber and matrix have favorable compatibility, this step adopts carbon black as photomask agent, and γ-glycidol ether propyl trimethoxy silicane is as coupling agent; The face coat of preparation remediation intensification fiber, and according to 15% the volume ratio embedding amount as fiber.
2. the intelligent structure self-healing method based on light repairing technology according to claim 1 is characterized in that, said first step specifically comprises the following steps one to step 3:
Step 1: prepolymer---the epoxy acrylate of preparation photocuring renovation agent; Under catalyst action; With epoxy resin and acrylic acid is raw material, makes after 100 ℃ of constant temperature esterifications through 5 hours, and the viscosity of the epoxy acrylate of preparation in the time of 25 ℃ is 6800mPas;
Step 2: the photoinitiator system of preparation photocuring renovation agent; Different light triggers have different response wave lengths and light-initiated efficient, in this step, according to the ability spectrum signature of sunshine; Adopt spectroscopic analysis methods; With light trigger 2-hydroxy-2-methyl-1-phenylacetone with two 2,4,6-trimethylbenzoyl diphenyl phosphine oxide preparation in 1: 1 by mass percentage composite photoinitiator system;
Step 3: confirm the proportioning components of photocuring renovation agent, with prepolymer, reactive diluent and light trigger preparation in 15: 4: 1 by mass percentage photocuring renovation agent, the viscosity of prepared photocuring renovation agent in the time of 25 ℃ is 5983mPas.
3. the intelligent structure self-healing method based on light repairing technology according to claim 1; It is characterized in that; Use the energy supply of sunshine as intelligent structure self-healing; The photocuring renovation agent need not prepared the special-purpose light source of repairing as the material supply, only just can realize material rapidly self-healing wound by natural solar energy.
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| CN102253087A (en) * | 2011-06-22 | 2011-11-23 | 南京航空航天大学 | Device and method for automatically measuring fatigue crack propagation velocity |
| CN103512751A (en) * | 2013-07-03 | 2014-01-15 | 辽宁大学 | Bearing health state identification method based on probabilistic neural network |
| CN105467835B (en) * | 2016-01-06 | 2018-05-08 | 南京航空航天大学 | Composite structure damage self-repairing method based on FUZZY ALGORITHMS FOR CONTROL |
| CN109467720A (en) * | 2018-10-23 | 2019-03-15 | 华东交通大学 | A kind of composite material and its damage self-repairing method based on dual cure renovation agent |
| CN110509576A (en) * | 2019-08-13 | 2019-11-29 | 北京航空航天大学 | A kind of evaluation and test of composite structure impact injury and it is automatically repaired system |
| CN112373072B (en) * | 2020-10-23 | 2022-04-01 | 沈阳航空航天大学 | Repair of composite material wind power blade damage and health monitoring method of repaired structure |
| CN112504808A (en) * | 2020-11-02 | 2021-03-16 | 北京空天技术研究所 | Aircraft thermal protection system damage diagnosis method based on machine learning algorithm |
| CN113478832A (en) * | 2021-07-27 | 2021-10-08 | 贵州航天天马机电科技有限公司 | Process method for post-treatment repair of SLA parts |
| CN113866868A (en) * | 2021-10-08 | 2021-12-31 | 金陵科技学院 | Bionic optical fiber based on composite material and structure monitoring and wound generating and self-healing method |
| CN113777135B (en) * | 2021-10-09 | 2023-06-06 | 同济大学 | Monitoring and repairing structure, monitoring method and repairing method for interlayer cracking of fiber reinforced thermosetting resin matrix composite material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598626A (en) * | 2004-07-28 | 2005-03-23 | 南京航空航天大学 | Fibre-optical intelligent sandwich in intelligent material and structure and manufacturing technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598626A (en) * | 2004-07-28 | 2005-03-23 | 南京航空航天大学 | Fibre-optical intelligent sandwich in intelligent material and structure and manufacturing technique |
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