CN104181237B - Structural member flaw detection monitoring temperature compensating method and system thereof - Google Patents

Abstract

The invention discloses a structural member flaw detection monitoring temperature compensating method and a system thereof, and relates to the technical filed of structure quality monitoring. The method is designed to solve the problems of complicate reference signal acquisition and the like of present structural member flaw detection monitoring temperature compensating methods. The structural member flaw detection monitoring temperature compensating method comprises the following steps: determining compensation parameter values by comparing the characteristics of a reference signal at any temperature with the characteristics of a current signal at the any temperature, and moving and deforming reference signal waves according to the compensation parameter values in order to realize the temperature compensation of the current signal. The method and the system can well eliminate the influences of the temperature change on the signal without acquiring a lot of reference signals under many temperatures, save a lot of time and operation cost for the structure quality monitoring, have strong practicality, and have a wide application prospect.

Description

A kind of structural member flaw detection monitoring temperature compensation method and system

Technical field

The present invention relates to structural health monitoring technology field, more particularly, to a kind of structural member flaw detection monitoring temperature compensation method And system.

Background technology

Key under the long term of cyclic loading and multiple extreme environment, on aircraft and some other mechanized equipment It is possible that damaging, such as the burn into of metal structure deforms structure, the delamination of composite structure, unsticking etc..These damage such as Can not find in time and maintenance can cause very big potential safety hazard it is therefore desirable to be identified to these damages, recognition methodss are Current demand signal is obtained and by current demand signal and reference signal contrast by the monitored part of Sensor monitoring, thus obtaining the position of damage Put, size situations such as.

Because the change of temperature can affect the glue-line of the material properties of structure, the attribute of sensor and bonding sensor Attribute etc., when the ambient temperature residing for therefore when structure changes, signal wave propagation property therein, such as wave amplitude, velocity of wave etc., Also can change.When carrying out damage quantitativeization identification, often need to carry out signal analysis with reference line method, at this moment wave amplitude and ripple The minor alteration of speed often causes larger signal difference, and then has a strong impact on the result of non-destructive tests it is therefore desirable to carry out Temperature-compensating.

The method having many temperature-compensatings at present, is substantially and first the operating temperature of structure is divided into the little temperature of dozens of Degree is interval, and the current demand signal at a certain temperature is compared with the reference signal under this corresponding temperature.Such method Advantage is all very reliable for any type of structure, but a disadvantage is that gather reference signal under each temperature range often than Cumbersome.Such as a large-scale aircaft configuration, its structure temperature is dropped to subzero 50 degree or is just raised to 60 degree above freezing Need large-scale, high control precision a temperature control workshop, and this is difficult to.

For the problems referred to above, need badly and a kind of the reference signal gathering each temperature range will not needed just preferably to eliminate The temperature compensation of temperature impact and system.

Content of the invention

It is an object of the present invention to proposing a kind of structural member flaw detection monitoring temperature compensation method, can be the strong of structure Substantial amounts of time and running cost are saved in health monitoring.

Further object is that proposing a kind of structural member flaw detection monitoring temperature compensation system, it can be structure Substantial amounts of time and running cost are saved in health monitoring.

For reaching this purpose, on the one hand, the present invention employs the following technical solutions:

A kind of structural member flaw detection monitoring temperature compensation method, methods described at least comprises the following steps:

Step a, offer reference signal waveform figure at the first temperature；

Step b, the current demand signal oscillogram obtaining under second temperature；

Step c, the current signal characteristics point of the current demand signal ripple taking under second temperature, take the reference signal at a temperature of first The reference signal characteristic point of waveform, described current signal characteristics point is corresponding with described reference signal characteristic point respectively, and contrast is worked as Front signal characteristic point and reference signal characteristic point obtain compensating parameter value；

Step d, according to compensating parameter value, the reference signal ripple at a temperature of first is moved and deform, obtain second At a temperature of reference signal waveform figure.

Further, described reference signal waveform figure and described current demand signal oscillogram be all with the time as transverse axis, with wave amplitude For the longitudinal axis, described compensating parameter at least includes time bias parameter and wave amplitude compensating parameter.

Preferably, described signal characteristic point is the crest of signal wave and/or the intersection point of trough and/or signal wave and transverse axis.

Preferably, described time bias parameter be reference signal ripple at a temperature of first with second temperature under reference signal The characteristic point time difference of ripple.

Preferably, described reference signal at least includes the first reference signal and the second reference signal, described reference signal Acquisition methods are:

First sensor, second sensor and monitored part are provided；

Described first reference signal is to be excited and be passed directly to by first sensor the signal of second sensor；

Described second reference signal is to be excited by first sensor, reflect through monitored part, is then passed to second sensor Signal.

Preferably, described current demand signal at least includes the first current demand signal and the second current demand signal, described current demand signal Acquisition methods are:

First sensor, second sensor and monitored part are provided；

Described first current demand signal is the signal being excited and be passed directly to by first sensor second sensor；

Described second current demand signal is formed by stacking by two parts of signals, and a part is to be excited by first sensor, through being supervised Survey part reflection, be then passed to the signal of second sensor, another part be excited by first sensor, the damage through monitored part Portion is reflected, and is then passed to the signal of second sensor.

Preferably, methods described particularly as follows:

Take the characteristic point crest j1(j1t, j1a of pumping signal) and trough j2(j2t, j2a),

Take the characteristic point crest b1(b1t, b1a of the first reference signal at a temperature of first) and trough b2(b2t, b2a), the The characteristic point crest b3(b3t, b3a of two reference signals) and trough b4(b4t, b4a),

Take the characteristic point crest ac1(ac1t, ac1a of the first current demand signal under second temperature) and trough ac2(ac2t, Ac2a),

When the pars affecta of monitored part is not on the path of first sensor and second sensor, under second temperature One reference signal is identical with the first current demand signal under second temperature, by the second reference signal wave direction right translation at a temperature of first Time bias parameter δ t2 and by its waveform with scaling second benchmark obtaining under second temperature of wave amplitude compensating parameter r3 Signal,

$\mathrm{\δt}2=\frac{\mathrm{\δt}1\·\mathrm{\δtb}2}{\mathrm{\δtb}1},$

Wherein, the time of the first reference signal at a temperature of δ t1 is the first reference signal and first under second temperature Difference, $\mathrm{\δt}1=\frac{\mathrm{ac}1t-b1t+\mathrm{ac}2t-b2t}{2},$

δ tb1 is the time difference of the first reference signal at a temperature of first and pumping signal,

$\mathrm{\δtb}1=\frac{b1t-j1t+b2t-j2t}{2},$

δ tb2 is the time difference of the second reference signal under the first temperature conditionss and pumping signal,

$\mathrm{\δtb}2=\frac{b3t-j1t+b4t-j2t}{2};$

$r3=\frac{r1\·f\left(\mathrm{\δtb}2\right)}{f\left(\mathrm{\δtb}1\right)},$

Wherein, $r1=\frac{\mathrm{ac}1a}{b1a}.$

Preferably, f (δ tb1)=δ tb1, f (δ tb2)=δ tb2.

On the other hand, the present invention employs the following technical solutions:

A kind of structural member flaw detection monitoring temperature compensation system, for realizing above-mentioned structural member flaw detection monitoring temperature compensation side Method, described temperature compensation system includes signal exciting bank, detection means, signal pickup assembly, ripple signal temperature compensation means And control panel, wherein, signal exciting bank is used for providing pumping signal；Detection means is included for providing described current letter The ripple signal transducer of number ripple and the temperature sensor for detecting described second temperature；Signal pickup assembly is used for gathering described Current demand signal ripple and described second temperature signal simultaneously transmit to ripple signal temperature compensation system；Pre- in ripple signal temperature compensation means There is the reference signal waveform figure at a temperature of described first, mends for the current demand signal ripple under described second temperature is entered with trip temperature Repay；Control panel includes the controlling interface for the display screen of displays temperature compensation result with for controlling temperature compensation procedure.

Preferably, it is pre-stored in the reference wave signal waveform at a temperature of described first in described ripple signal temperature compensation means Figure is detected by described detection means in advance, then transmits to described ripple signal temperature-compensating after the collection of described signal pickup assembly Device.

Monitoring temperature compensation method and system the invention has the benefit that the structural member that the present invention provides is detected a flaw, pass through Contrast the characteristic point of the current demand signal under the reference signal and arbitrary temperature at arbitrary temperature, determine compensating parameter value, Ran Hougen According to this compensating parameter value, reference signal ripple is moved and deforms, thus realize to the temperature-compensating of reference signal it is not necessary to Reference signal under the substantial amounts of, various temperature of collection just can eliminate the impact to signal for the temperature change well, is being good for of structure Health monitoring saves substantial amounts of time and running cost, practical, has broad application prospects.

Brief description

Fig. 1 is the schematic diagram that monitored part is carried out with flaw detection monitoring that the specific embodiment of the invention provides；

Fig. 2 is the reference signal waveform figure at a first temperature of the specific embodiment of the invention provides and under second temperature；

Fig. 3 is the current demand signal oscillogram under the second temperature that the specific embodiment of the invention provides；

Fig. 4 is the structural representation of the structural member flaw detection monitoring temperature compensation system that the present invention provides.

In figure, 1, first sensor；2nd, second sensor；3rd, reinforcement；4th, pars affecta.

Specific embodiment

Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.

The flaw detection monitoring temperature compensation method of present configuration part at least comprises the following steps:

Step a, offer reference signal waveform figure at the first temperature；

Step b, the current demand signal oscillogram obtaining under second temperature；

Step c, the current signal characteristics point of the current demand signal ripple taking under second temperature, take the reference signal at a temperature of first The reference signal characteristic point of waveform, described current signal characteristics point is corresponding with described reference signal characteristic point respectively, and contrast is worked as Front signal characteristic point and reference signal characteristic point obtain compensating parameter value；

Step d, according to compensating parameter value, the reference signal ripple at a temperature of first is moved and deform, obtain second At a temperature of reference signal waveform figure.

Wherein, because reference signal waveform figure and current demand signal oscillogram are all with the time as transverse axis, with wave amplitude as the longitudinal axis, because This compensating parameter is preferably time bias parameter and wave amplitude compensating parameter；Signal characteristic point does not specifically limit, and can be signal wave Crest and/or trough and/or signal wave and the intersection point of transverse axis, can conveniently carry out contrasting.

The method just can eliminate temperature change well due to not needing to gather the reference signal under substantial amounts of, various temperature Impact to signal, the therefore health monitoring for structure save substantial amounts of time and running cost, practical, have wide Application prospect.

For said method, the invention allows for a kind of structural member flaw detection monitoring temperature compensation system, for realizing The structural member flaw detection monitoring temperature compensation method stated.As shown in figure 4, this temperature compensation system includes signal exciting bank, detection Device, signal pickup assembly, ripple signal temperature compensation means and control panel.Wherein, signal exciting bank be used for providing sharp Encourage signal；Detection means is included for providing the ripple signal transducer of current demand signal ripple and the temperature biography for detecting second temperature Sensor；Signal pickup assembly is used for gathering current demand signal ripple and second temperature signal and transmitting to ripple signal temperature compensation system； The reference signal waveform figure at a temperature of first is prestored, for the current letter under second temperature in ripple signal temperature compensation means Number ripple carries out temperature-compensating；Control panel includes for the display screen of displays temperature compensation result and is used for controlling temperature-compensating The controlling interface of journey.

Wherein, being pre-stored in the reference signal waveform figure at a first temperature of in ripple signal temperature compensation means can be in advance by examining Survey device detection, then transmit to ripple signal temperature compensation means after signal pickup assembly collection, also can be in other equipment Store to ripple signal temperature compensation means after completing measurement.

Taking a structure containing reinforcement as a example it is specifically described the temperature compensation of the present invention below.

As shown in figure 1, providing first sensor 1 and second sensor 2 to carry out health monitoring.

Reference signal at least includes the first reference signal and the second reference signal.First reference signal is by first sensor 1 excites and is passed directly to the signal of second sensor 2；Second reference signal be excited by first sensor 1, reinforced muscle 3 anti- Penetrate, be then passed to the signal of second sensor 2.

Current demand signal at least includes the first current demand signal and the second current demand signal.First current demand signal is by first sensor 1 excites and is passed directly to the signal of second sensor 2；Second current demand signal is formed by stacking by two parts of signals, and a part is served as reasons First sensor 1 excites, reinforced muscle 3 reflects, and is then passed to the signal of second sensor 2, and another part is to be sensed by first Device 1 excites, reflects through pars affecta 4, is then passed to the signal of second sensor 2.

Fig. 2 and Fig. 3 is reference signal and the oscillogram of current demand signal.As shown in Fig. 2 the wave group in the ellipse of left side is excitation Signal wave；In wave group in middle ellipse, point section line ripple is the first reference signal ripple at a temperature of first, and solid line ripple is the second temperature The first reference signal ripple under degree；In wave group in the ellipse of right side, point section line ripple is the second reference signal ripple at a temperature of first, Solid line ripple is the second reference signal ripple under second temperature.As shown in figure 3, left side is pumping signal ripple, the ripple in the ellipse of middle part Group is the first current demand signal ripple under second temperature, and the wave group in the ellipse of right side is the second current demand signal ripple under second temperature. Wherein, the reference signal waveform at a temperature of first and the current base signal waveform under second temperature are known, our mesh Be the reference signal ripple obtaining under second temperature, thus will be current under the reference signal ripple under second temperature and second temperature Signal wave carries out contrasting the situation obtaining pars affecta.

Firstly the need of taking characteristic point, take in the present embodiment is crest and trough.Take the characteristic point ripple of pumping signal respectively Peak j1(j1t, j1a) and trough j2(j2t, j2a), take the characteristic point crest b1(b1t of the first reference signal at a temperature of first, B1a) and trough b2(b2t, b2a), the characteristic point crest b3(b3t, b3a of the second reference signal) and trough b4(b4t, b4a), take The characteristic point crest ac1(ac1t, ac1a of the first current demand signal under second temperature) and trough ac2(ac2t, ac2a).Accordingly Have, the characteristic point crest a1(a1t, a1a of the first reference signal under second temperature) and trough a2(a2t, a2a), second temperature Under characteristic point crest a3 (a3t, a3a) of the second reference signal and trough a4(a4t, a4a).

Time bias: when pars affecta is not on the path of first sensor 1 and second sensor 2, due to obtaining condition Identical with acquisition modes, under the first reference signal and second temperature therefore under second temperature the basic phase of the first current demand signal Same, so the second reference signal under second temperature only need to be obtained, and there is a1t=ac1t, a1a=ac1a；A2t=ac2t, a2a=ac2a.

For same wave group, i.e. wave group in the same ellipse of in figure, if the difference of the characteristic point time difference being led to by temperature Identical, then the time difference of the first reference signal at a temperature of the first reference signal and first under second temperature

$\mathrm{\δt}1=\frac{a1t-b1t+a2t-b2t}{2}=\frac{\mathrm{ac}1t-b1t+\mathrm{ac}2t-b2t}{2},$

The time difference of the second reference signal at a temperature of the second reference signal and first under second temperature

$\mathrm{\δt}2=\frac{a3t-b3t+a4t-b4t}{2},$

The first reference signal at a temperature of first and the time difference of pumping signal

$\mathrm{\δtb}1=\frac{b1t-j1t+b2t-j2t}{2},$

The second reference signal under first temperature conditionss and the time difference of pumping signal

$\mathrm{\δtb}2=\frac{b3t-j1t+b4t-j2t}{2},$

If the degree of ripple propagation temperature influence is identical in monitored area, then have,

$\frac{\mathrm{\δt}1}{\mathrm{\δt}2}=\frac{\mathrm{\δtb}1}{\mathrm{\δtb}2},$

Therefore can get time bias parameterδ t1, δ tb2, δ tb1 all can be obtained by calculating ?.By the second reference signal wave direction right translation time bias parameter δ t2 at a temperature of first can eliminate by temperature lead to when Between difference change.

Seeking time difference when can not also average, each corresponding crest or trough are respectively calculated, that is, with The time difference of a1 and b1 determines the time difference of a3 and b3, determines the time difference of a4 and b4, concrete application with the time difference of a2 and b2 When suitable selection can be made according to waveform.

Wave amplitude compensates: the wave amplitude ratio of the first reference signal at a temperature of the first reference signal and first under second temperature It is represented by $r1=\frac{a1a}{b1a}=\frac{\mathrm{ac}1a}{b1a},$

The wave amplitude ratio of the second reference signal at a temperature of the second reference signal and first under second temperature is represented by $r3=\frac{a3a}{b3a},$

If r1, r3 and δ tb1, δ tb2 meets relation

Wave amplitude compensating parameter can be obtained

By translation after ripple waveform with wave amplitude compensating parameter r3 scaling can obtain under second temperature second Reference signal.

F(x in above formula) function can be determined by way of experiment, theory analysis or numerical simulation.For simplicity, In the case that refinement degree is not very high, f(x)=x.

Need additionally to point out is a bit, this compensation method be only applicable to pars affecta not on the path of sensor when, when Need when pars affecta is on the path of sensor in addition to be processed using other modes.

Describe the know-why of the present invention above in association with specific embodiment.These descriptions are intended merely to explain the present invention's Principle, and limiting the scope of the invention can not be construed to by any way.Based on explanation herein, the technology of this area Personnel do not need to pay other specific embodiments that performing creative labour can associate the present invention, and these modes fall within Within protection scope of the present invention.

Claims (7)

1. a kind of structural member flaw detection monitoring temperature compensation method is it is characterised in that methods described at least comprises the following steps:

Step a, offer reference signal waveform figure at the first temperature；

Step b, the current demand signal oscillogram obtaining under second temperature；

Step c, the current signal characteristics point of the current demand signal ripple taking under second temperature, take the reference signal waveform at a temperature of first Reference signal characteristic point, described current signal characteristics point is corresponding with described reference signal characteristic point respectively, and contrast is current to be believed Number characteristic point and reference signal characteristic point obtain compensating parameter value；

Step d, according to compensating parameter value, the reference signal ripple at a temperature of first is moved and deform, obtain in second temperature Under reference signal waveform figure；

Described reference signal waveform figure and described current demand signal oscillogram all with the time as transverse axis, with wave amplitude as the longitudinal axis, described benefit Repay parameter and at least include time bias parameter and wave amplitude compensating parameter；

Described time bias parameter be reference signal ripple at a temperature of first with second temperature under reference signal ripple characteristic point Time difference；

Described reference signal at least includes the first reference signal and the second reference signal, and the acquisition methods of described reference signal are:

First sensor (1), second sensor (2) and monitored part are provided；

Described first reference signal is to be excited by first sensor (1) and be passed directly to the signal of second sensor (2)；

Described second reference signal is to be excited by first sensor (1), reflect through monitored part, is then passed to second sensor (2) signal.

2. a kind of structural member flaw detection monitoring temperature compensation method according to claim 1 it is characterised in that: described signal is special Levy is a little the crest of signal wave and/or the intersection point of trough and/or signal wave and transverse axis.

3. a kind of structural member flaw detection monitoring temperature compensation method according to claim 1 it is characterised in that

Described current demand signal at least includes the first current demand signal and the second current demand signal, and the acquisition methods of described current demand signal are:

First sensor (1), second sensor (2) and monitored part are provided；

Described first current demand signal is to be excited by first sensor (1) and be passed directly to the signal of second sensor (2)；

Described second current demand signal is formed by stacking by two parts of signals, and a part is to be excited by first sensor (1), through monitored Part reflects, and is then passed to the signal of second sensor (2), another part is to be excited by first sensor (1), through monitored part Pars affecta (4) reflects, and is then passed to the signal of second sensor (2).

4. a kind of structural member flaw detection monitoring temperature compensation method according to claim 3 is it is characterised in that methods described has Body is:

Take characteristic point crest j1 (j1t, j1a) and the trough j2 (j2t, j2a) of pumping signal,

Take characteristic point crest b1 (b1t, b1a) of the first reference signal and the trough b2 (b2t, b2a) at a temperature of first, the second base Characteristic point crest b3 (b3t, b3a) of calibration signal and trough b4 (b4t, b4a),

Take characteristic point crest ac1 (ac1t, ac1a) of the first current demand signal and the trough ac2 (ac2t, ac2a) under second temperature,

When the pars affecta (4) of monitored part is not on the path of first sensor (1) and second sensor (2), second temperature Under the first reference signal identical with the first current demand signal under second temperature, by the second reference signal wave direction at a temperature of first Right translation time bias parameter δ t2 and by its waveform with wave amplitude compensating parameter r3 scaling obtain under second temperature Two reference signals,

$\mathrm{\δ}t2=\frac{\mathrm{\δ}t1\·\mathrm{\δ}tb2}{\mathrm{\δ}tb1},$

Wherein, the time difference of the first reference signal at a temperature of δ t1 is the first reference signal and first under second temperature,

δ tb1 is the time difference of the first reference signal at a temperature of first and pumping signal,

δ tb2 is the time difference of the second reference signal under the first temperature conditionss and pumping signal,

$r3=\frac{r1\·f\left(\mathrm{\δ}tb2\right)}{f\left(\mathrm{\δ}tb1\right)},$

Wherein,

5. a kind of structural member flaw detection monitoring temperature compensation method according to claim 4 it is characterised in that: f (δ tb1)= δ tb1, f (δ tb2)=δ tb2.

6. a kind of structural member flaw detection monitoring temperature compensation system, for realizing the structural member as described in any one of claim 1 to 5 Flaw detection monitoring temperature compensation method it is characterised in that: described temperature compensation system includes signal exciting bank, detection means, letter Number harvester, ripple signal temperature compensation means and control panel, wherein,

Signal exciting bank, for providing pumping signal；

Detection means, including for providing the ripple signal transducer of described current demand signal ripple and being used for detecting described second temperature Temperature sensor；

Signal pickup assembly, for gathering described current demand signal ripple and described second temperature signal and transmitting to ripple signal temperature benefit Repay system；

Ripple signal temperature compensation means, prestores the reference signal waveform figure at a temperature of described first in it, for described Current demand signal ripple at a temperature of two carries out temperature-compensating；

Control panel, including the display screen for displays temperature compensation result and control circle for controlling temperature compensation procedure Face.

7. a kind of structural member flaw detection monitoring temperature compensation system according to claim 6 it is characterised in that: be pre-stored in described The reference wave signal waveforms at a temperature of described first in ripple signal temperature compensation means are detected by described detection means in advance, Then transmit to described ripple signal temperature compensation means after the collection of described signal pickup assembly.