CN109596673A - A kind of low-temperature composite material tank damage online recognition method based on coupling machine electrical impedance - Google Patents
A kind of low-temperature composite material tank damage online recognition method based on coupling machine electrical impedance Download PDFInfo
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- CN109596673A CN109596673A CN201811368150.2A CN201811368150A CN109596673A CN 109596673 A CN109596673 A CN 109596673A CN 201811368150 A CN201811368150 A CN 201811368150A CN 109596673 A CN109596673 A CN 109596673A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
Abstract
The invention discloses a kind of, and the low-temperature composite material tank based on coupling machine electrical impedance damages online recognition method, and this method acquires the benchmark mechanical-electric coupling impedance information of sensor network first, and extracts real part imaginary signals feature；Then, existing impedance signal is acquired according to time step, and compared with reference signal；Illustrate not damage if the root-mean-square-deviation of two groups of signals is less than threshold value, needs further to compare real part peak value if more than threshold value, imaginary part slope, the signal characteristics such as real part frequency response are to determine damage type；Assert that structure occurrence of large-area is damaged if the sensor root-mean-square-deviation in sensor network being more than sum 30% is greater than threshold value.The present invention damages judgement-damnification recognition method using stagewise, both ensure that the fluency of monitoring was in turn ensured and has accurately identified to damage position, type, severity.
Description
Technical field
The present invention relates to low-temperature composite material tank damaging techniques fields more particularly to a kind of based on coupling machine electrical impedance
Low-temperature composite material tank damages online recognition method.
Background technique
For low temp fuel tank as the maximum component of weight and volume accounting in space launch vehicle propulsion system, structure is multiple
Condensation material has become the important topic of aerospace structure lighting development.With metal material used by traditional tank structure
It compares, the generation of damage of composite materials and extension are more hidden under cryogenic conditions, and cause structural damage and failure that there is emergentness,
Therefore, it is particularly important for low-temperature composite material tank damage online recognition.Damage check based on mechanical-electric coupling impedance
Method is widely applied in the structural elements status assessment under general environment.Damage check based on mechanical-electric coupling impedance
It is convenient and efficient that the characteristics of method and advantage essentially consist in high this method detection sensitivity, signal acquisition and processing, therefore can be more
Efficiently assessment damage detailed condition.
In tank structure temperature-fall period, sensor is possible to destroy because of thermal stress with installation adhesive, causes
The failure of impedance damage identification technique；Under low temperature loading environment, sensor and adhesive are easy to stress and performance degradation occur,
Non-destructive tests result is caused to be distorted.Therefore, the structure damage being often rarely applied under low temperature environment based on electromechanical impedance methodologies
In wound identification.
Summary of the invention
According to problem of the existing technology, the invention discloses a kind of low-temperature composite materials based on coupling machine electrical impedance
Tank damages online recognition method, comprising the following steps:
S1: piezoelectric chip sensor is installed in hotspot location；
S2: acquisition reference impedance signal is named as ImB and is stored in impedance signal space, and reference impedance letter is extracted
Number real part peak value, imaginary part slope, real part frequency response signal characteristic, be respectively designated as MrB, SlB and FrB and be stored respectively in
Real part head room, imaginary part gradient space and real part frequency response space；
S3: the existing electromechanical impedance signal of acquisition is named as ImC, is calculated equal between ImB obtained in ImC and S2
Root mean square deviation RMSD；
S4: whether root-mean-square-deviation RMSD is judged less than 0.2, if it is not damaged for structure, deletion ImC recycles S3；
It is considered as that damaging occurs in structure or sensor performance is degenerated if root-mean-square-deviation RMSD is more than or equal to 0.2, ImC is ordered again
Entitled ImC (i) is stored in impedance signal space, recycles S3；If the sensor in sensor network more than sum 30% is square
Root deviation RMSD is greater than 0.2 and assert that structure occurrence of large-area is damaged, and need to stop using immediately；
S5: when compared with reference signal feature: the decline of imaginary part slope, the decline of real part response frequency then judge: the rigidity of structure
There is Hydrogen Brittleness Phenomena in reduction, and real part response frequency is named as FrC (i) and is stored in real part response frequency space, and imaginary part is oblique
Rate is named as SlC (i) and is stored in imaginary part gradient space；
S6: when compared with reference signal feature: the decline of imaginary part slope, real part amplitude rise, damping reduces, then judge: de-
Layer damage, is named as SlC (i) for imaginary part slope and is stored in imaginary part gradient space, real part response frequency is named as MrC (i)
And it is stored in real part frequency response space；
S7: compared with reference signal feature, the decline of real part amplitude or the rising of real part response frequency then judge that sensor goes out
Existing degradation phenomena needs to pick from non-destructive tests sensor network if real part amplitude or the variation of real part response frequency are greater than 10%
Except degeneration sensor, and sensor is reinstalled in maintenance process.
By adopting the above-described technical solution, a kind of low-temperature composite material based on coupling machine electrical impedance provided by the invention
Tank damages online recognition method, and the electromechanical impedance signal feature based on distributed sensor, may be implemented pole in the method
Function is monitored in the finings such as sensing system self diagnosis, the identification of online situation, damage alarming, damage classifying under end ring border on-line
Energy.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow chart of the method for the present invention.
Fig. 2 is the operation schematic diagram of present invention test test specimen and impedance analyzer；
Fig. 3 is the schematic diagram of different sensors impedance signal in loading procedure of the present invention；
Fig. 4 is that the RMSD variation tendency in loading procedure of the present invention between different sensors impedance signal and reference signal is shown
It is intended to；
Fig. 5 is ultrasonic scanning non-destructive tests result schematic diagram of the present invention.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, with reference to the attached drawing in the embodiment of the present invention, to this
Technical solution in inventive embodiments carries out clear and complete description:
A kind of low-temperature composite material tank based on coupling machine electrical impedance as shown in Figure 1 damages online recognition method, tool
Body the following steps are included:
S1: piezoelectric chip sensor is installed in hotspot location；
S2: acquisition reference impedance signal is named as ImB and is stored in impedance signal space, and reference impedance letter is extracted
Number real part peak value, imaginary part slope, real part frequency response signal characteristic, be respectively designated as MrB, SlB and FrB and be stored respectively in
Real part head room, imaginary part gradient space and real part frequency response space；
S3: every the existing electromechanical impedance signal of acquisition in 1 second, being named as ImC, calculate ImB obtained in ImC and S2 it
Between root-mean-square-deviation RMSD；
S4: whether root-mean-square-deviation RMSD is judged less than 0.2, if it is not damaged for structure, deletion ImC recycles S3；
It is considered as that damaging occurs in structure or sensor performance is degenerated if root-mean-square-deviation RMSD is more than or equal to 0.2, ImC is ordered again
Entitled ImC (i) is stored in impedance signal space, recycles S3；If the sensor in sensor network more than sum 30% is square
Root deviation RMSD is greater than 0.2 and assert that structure occurrence of large-area is damaged, and need to stop using immediately；
S5: when compared with reference signal feature: the decline of imaginary part slope, the decline of real part response frequency then judge: the rigidity of structure
There is Hydrogen Brittleness Phenomena in reduction, and real part response frequency is named as FrC (i) and is stored in real part response frequency space, and imaginary part is oblique
Rate is named as SlC (i) and is stored in imaginary part gradient space；
S6: when compared with reference signal feature: the decline of imaginary part slope, real part amplitude rise, damping reduces, then judge: de-
Layer damage, is named as SlC (i) for imaginary part slope and is stored in imaginary part gradient space, real part response frequency is named as MrC (i)
And it is stored in real part frequency response space；
S7: compared with reference signal feature, the decline of real part amplitude or the rising of real part response frequency then judge that sensor goes out
Existing degradation phenomena needs to pick from non-destructive tests sensor network if real part amplitude or the variation of real part response frequency are greater than 10%
Except degeneration sensor, and sensor is reinstalled in maintenance process.
Embodiment
Such as Fig. 2-Fig. 5 method specific embodiment disclosed by the invention the following steps are included:
1, piezoelectric chip sensor is installed on composite laminated plate surface, sensor passes through signal switch and impedance
Analyzer is connected；
2, test specimen is mounted in fixture；
3, low temperature environment is built with liquid nitrogen, fixture is placed in low temperature environment；
4, in test specimen middle section load bending load, load continues to increase；
5, reference impedance signal is acquired, ImB is named as and is stored in impedance signal space, while extracting its real part peak
Value, imaginary part slope, the signal characteristics such as real part frequency response are respectively designated as MrB, SlB and FrB, and are stored respectively in real part peak
It is worth space, imaginary part gradient space and real part frequency response space, enters step 3；
6, every the existing electromechanical impedance signal of acquisition in 1 second, it is named as ImC, calculates IMB obtained in IMC and step 2
Between root-mean-square-deviation RMSD, enter step 4；
7, the RMSD coefficient of No. 2 sensors is more than 0.2 after load reaches 4500N, is tried as sensor proximity appearance
Damage ImC renamed as ImC (4200) is stored in impedance signal space, repeats step 4, enters step 5,6；
8, risen by No. 2 sensor real part amplitudes known to signal analysis, response frequency decline illustrates to damp at this
Increase phenomenon, preliminary judgement is MDI vector.
9, lasting load, when load reaches 4600N, the RMSD of 2,3, No. 6 sensors has been more than 0.2,0.5 and 0.4.Cause
This, assert that mass lesions occurs in structure, or a large amount of sensor performances are degenerated, and ImC renamed as ImC (4600) is stored
In impedance signal space, stop load.As shown in figure 3, the real part amplitude of 2,3, No. 6 sensors goes out under 4600N load-up condition
There is downward trend, assert occur MDI vector at this in existing ascendant trend, real part response frequency.
10, the Results Ultrasound scan after unloading confirms the validity of this damage online recognition method.
The invention discloses a kind of, and the low-temperature composite material tank based on coupling machine electrical impedance damages online recognition method.It should
Method acquires the benchmark mechanical-electric coupling impedance information of sensor network first, and extracts real part imaginary signals feature；Then, according to
Time step acquires existing impedance signal, and compared with reference signal；Illustrate if the root-mean-square-deviation of two groups of signals is less than threshold value
It does not damage, then needs further to compare real part peak value, imaginary part slope, the signal characteristics such as real part frequency response if more than threshold value
To determine damage type；Knot is assert if the sensor root-mean-square-deviation in sensor network being more than sum 30% is greater than threshold value
The damage of structure occurrence of large-area.The present invention using stagewise damage judgement-damnification recognition method, not only ensure that the fluency of monitoring but also
It ensure that and damage position, type, severity are accurately identified.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (1)
1. a kind of low-temperature composite material tank based on coupling machine electrical impedance damages online recognition method, feature is including following
Step:
S1: piezoelectric chip sensor is installed in hotspot location；
S2: acquisition reference impedance signal is named as ImB and is stored in impedance signal space, extracts reference impedance signal
Real part peak value, imaginary part slope, real part frequency response signal characteristic, are respectively designated as MrB, SlB and FrB and are stored respectively in real part
Head room, imaginary part gradient space and real part frequency response space；
S3: the existing electromechanical impedance signal of acquisition is named as ImC, calculates the root mean square between ImB obtained in ImC and S2
Deviation RMSD；
S4: whether root-mean-square-deviation RMSD is judged less than 0.2, if it is not damaged for structure, deletion ImC recycles S3；If
Root-mean-square-deviation RMSD is more than or equal to 0.2 and is considered as that damaging occurs in structure or sensor performance is degenerated, by ImC renamed as
ImC (i) is stored in impedance signal space, recycles S3；If the sensor root mean square in sensor network more than sum 30% is inclined
Poor RMSD is greater than 0.2 and assert that structure occurrence of large-area is damaged, and need to stop using immediately；
S5: when compared with reference signal feature: the decline of imaginary part slope, the decline of real part response frequency then judge: the rigidity of structure reduces
There is Hydrogen Brittleness Phenomena, real part response frequency is named as FrC (i) and is stored in real part response frequency space, imaginary part slope is ordered
Entitled SlC (i) is simultaneously stored in imaginary part gradient space；
S6: when compared with reference signal feature: the decline of imaginary part slope, real part amplitude rise, damping reduces, then judge: delamination damage
Wound, is named as SlC (i) for imaginary part slope and is stored in imaginary part gradient space, real part response frequency is named as MrC (i) and is deposited
Storage is in real part frequency response space；
S7: compared with reference signal feature, the decline of real part amplitude or the rising of real part response frequency then judge that sensor moves back
Change phenomenon, needs to reject from non-destructive tests sensor network if real part amplitude or the variation of real part response frequency are greater than 10% and move back
Change sensor, and reinstalls sensor in maintenance process.
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Citations (4)
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|---|---|---|---|---|
| US7880483B2 (en) * | 2007-03-30 | 2011-02-01 | Powdertech Co., Ltd. | Method for inspecting quality of core material for electrophotographic ferrite carrier |
| CN102393407A (en) * | 2011-09-09 | 2012-03-28 | 湖南大学 | Interfacial debonding monitoring method for steel tube concrete tube wall based on piezoelectric impedance measurement |
| CN104597083A (en) * | 2015-01-13 | 2015-05-06 | 大连理工大学 | Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method |
| CN105388190A (en) * | 2015-11-17 | 2016-03-09 | 郑州大学 | Composite material wing damage positioning method based on electrical impedance of coupling machine |
-
2018
- 2018-11-16 CN CN201811368150.2A patent/CN109596673A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7880483B2 (en) * | 2007-03-30 | 2011-02-01 | Powdertech Co., Ltd. | Method for inspecting quality of core material for electrophotographic ferrite carrier |
| CN102393407A (en) * | 2011-09-09 | 2012-03-28 | 湖南大学 | Interfacial debonding monitoring method for steel tube concrete tube wall based on piezoelectric impedance measurement |
| CN104597083A (en) * | 2015-01-13 | 2015-05-06 | 大连理工大学 | Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method |
| CN105388190A (en) * | 2015-11-17 | 2016-03-09 | 郑州大学 | Composite material wing damage positioning method based on electrical impedance of coupling machine |
Non-Patent Citations (1)
| Title |
|---|
| DONGYUE GAO 等: ""Integrated impedance and Lamb wave–based structural health monitoring strategy for long-term cycle-loaded composite structure"", 《STRUCTURAL HEALTH MONITORING》 * |
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Application publication date: 20190409 |