CN104897353A - Member damage detection method - Google Patents
Member damage detection method Download PDFInfo
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- CN104897353A CN104897353A CN201510350061.5A CN201510350061A CN104897353A CN 104897353 A CN104897353 A CN 104897353A CN 201510350061 A CN201510350061 A CN 201510350061A CN 104897353 A CN104897353 A CN 104897353A
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Abstract
The invention relates to the technical field of structure flaw detection, specifically relates to a member damage detection method, and solves the problem in the prior art that the member damage detection technology is low in detection efficiency and high in detection difficulty. In the member damage detection method, a dynamic data collecting and processing system is used to collect and process acceleration sensor signals generated when an initial excitation force is applied to a member to be detected under a predetermined boundary support condition, the modal frequency of the member to be detected is finally obtained, and then contrastive analysis is carried out between the modal frequency and a modal frequency value of an undamaged member under the same condition, so that whether the member is damaged and the damage degree are judged. The detection method is simple and is applicable to the member to be detected whose specific damaged parts are difficult to predict, whether the member is damaged can be also detected by one time, the detection efficiency is improved, and the operation is convenient, easy, economic and reliable.
Description
Technical field
The present invention relates to structure inspection technique field, be specifically related to a kind of component damage detection method.
Background technology
Existing structural damage detection technology, can carry out Non-Destructive Testing to the component of multiple material and version, and can provide accurate lesion size and position.But existing checkout equipment often cost is higher, also high to operating personnel's technical requirement; In addition, when detecting, whether damaging due to test specimen cannot be understood in advance, Non-Destructive Testing can only be carried out one by one to the position that may there is damage blindly, make detection efficiency low; Further, for yardstick comparatively large and damage location more hidden structure, detect more difficult.
Summary of the invention
The object of this invention is to provide a kind of component damage detection method, to solve the current problem that structural damage detection technology for detection efficiency is low, detection difficulty is large.
Technical scheme of the present invention is:
A kind of component damage detection method, comprises the steps:
Step one, yardstick according to test specimen to be measured, carry out the support constraint of predetermined condition on the first worktable by described test specimen to be measured;
Step 2, at described test specimen surface uniform to be measured dispersion stickup first acceleration transducer;
Step 3, apply exciting force to described component to be measured by the first vibrator, described first acceleration transducer detects the acceleration transducer signals that described component to be measured produces under described exciting force effect;
Step 4, gather described acceleration transducer signals by the first Dynamic Data Acquiring disposal system, and output modalities frequency data;
Step 5, go out the model frequency of described test specimen to be measured according to described model frequency Plotting data, the model frequency of described test specimen to be measured and the model frequency of intact test specimen are contrasted, judge whether described test specimen to be measured has damage according to comparison structure, the shape of wherein said intact test specimen, structure and material are all identical with described test specimen to be measured.
Alternatively, before described step one, also comprise the step of the model frequency measuring described intact test specimen:
Described intact test specimen is carried out on described first worktable retrain with the support of described test specimen the same terms to be measured;
Described intact surface of test piece pastes described first acceleration transducer with described test specimen same position place to be measured;
Apply the exciting force identical with described test specimen to be measured by described first vibrator to described intact test specimen, described first acceleration transducer detects the acceleration transducer signals of described intact component;
The acceleration transducer signals of described intact component is gathered by described first Dynamic Data Acquiring disposal system, and output modalities frequency data;
The model frequency of described intact test specimen is gone out according to described model frequency Plotting data.
Alternatively, described component damage detection method also comprises, the step of the model frequency of the described intact test specimen of measurement synchronously carried out to step 4 with described step one:
Described intact test specimen is carried out on the second worktable retrain with the support of described test specimen the same terms to be measured;
Described intact surface of test piece pastes the second acceleration transducer with described test specimen same position place to be measured, and described second acceleration transducer is identical with described first acceleration transducer model;
The exciting force identical with described test specimen to be measured is applied to described intact test specimen by the second vibrator, described second acceleration transducer detects the acceleration transducer signals of described intact component, wherein, described second vibrator is identical with described first vibrator model;
The acceleration transducer signals of described intact component is gathered by the second Dynamic Data Acquiring disposal system, and output modalities frequency data;
The model frequency of described intact test specimen is gone out according to described model frequency Plotting data.
Beneficial effect of the present invention:
In component damage detection method of the present invention, by adopting Dynamic Data Acquiring disposal system, the acceleration transducer signals that the to be measured component of acquisition process under a predetermined margin supports conditions produces by initial excitation power, and finally obtain the model frequency of component to be measured, again the model frequency value of component intact under this model frequency and equal conditions is analyzed, thus judges whether component to be measured damages even degree of injury; Whether detection method of the present invention is simple, can meet the component to be measured being difficult to predict concrete damage location, also disposablely can detect and damage, improve detection efficiency, simultaneously easy to operation, economical reliable.
Accompanying drawing explanation
Fig. 1 is the detection system structural representation of the embodiment that component damage detection method of the present invention is suitable for.
Embodiment
Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.
As shown in Figure 1, the component damage detection system structural representation of one embodiment of the invention.Based on this detection system, component damage detection method of the present invention, can comprise the steps:
Step one, yardstick according to test specimen 11 to be measured, carry out the support constraint of predetermined condition on the first worktable by test specimen 11 to be measured.Wherein, the support constraint of predetermined condition refers to the support pattern of test specimen 11 to be measured, such as or suspension clamped with fixture.
Step 2, paste acceleration transducer 12 in test specimen 11 surface uniform to be measured dispersion.
Step 3, apply exciting force to component 11 to be measured by vibrator 13, acceleration transducer 12 detects the acceleration transducer signals that component 11 to be measured produces under exciting force effect.
Step 4, gather described acceleration transducer signals by Dynamic Data Acquiring disposal system 14, and output modalities frequency data.
Step 5, go out the model frequency of test specimen to be measured according to model frequency Plotting data, the model frequency of test specimen 11 to be measured and the model frequency of intact test specimen 21 are contrasted, judges whether test specimen 11 to be measured has damage according to comparison structure.Wherein the shape of intact test specimen 21, structure and material are all identical with test specimen 11 to be measured.Further, the step drawing out the model frequency of test specimen 11 to be measured can be hand drawn, also can be that Dynamic Data Acquiring disposal system 14 is drawn; Model frequency contrast step also can be manual or be undertaken by Dynamic Data Acquiring disposal system 14.
In component damage detection method of the present invention, by adopting Dynamic Data Acquiring disposal system 14, the acceleration transducer signals that the to be measured component 11 of acquisition process under a predetermined margin supports conditions produces by initial excitation power, and finally obtain the model frequency of component to be measured, again the model frequency value of component 21 intact under this model frequency and equal conditions is analyzed, thus judge whether component to be measured damages, the degree of component damage to be measured even tentatively can be judged according to model frequency difference size; Whether this detection method is simple, can meet the component to be measured being difficult to predict concrete damage location, also disposablely can detect and damage, improve detection efficiency, simultaneously easy to operation, economical reliable.
Further, before above-mentioned steps one, also comprise the step of the model frequency measuring intact test specimen 21, can with reference to the method for testing of test specimen 11 model frequency to be measured, specific as follows:
First, intact test specimen 21 is carried out on the first worktable retrain with the support of test specimen 11 the same terms to be measured; Acceleration transducer 12 is pasted with test specimen 11 same position place to be measured on the surface again at intact test specimen 21; Apply the exciting force identical with test specimen 11 to be measured by vibrator 13 to intact test specimen 21 again, acceleration transducer 12 detects the acceleration transducer signals of intact component 21; The acceleration transducer signals of intact component 21 is gathered again by Dynamic Data Acquiring disposal system 14, and output modalities frequency data; The final model frequency going out intact test specimen 21 according to model frequency Plotting data.
Further, component damage detection method of the present invention can also comprise, the step of the model frequency of the intact test specimen 21 of measurement synchronously carried out to step 4 with step one, that is to say test specimen 11 model frequency to be measured to be detected to detect with intact test specimen 21 model frequency and carry out simultaneously, the situation that intact test specimen 21 model frequency does not have deposit in advance can be used in, and the authenticity of intact test specimen 21 model frequency can be improved further, make testing result more accurate.Particularly, comprise the steps:
First, intact test specimen 21 is carried out on the second worktable (using same worktable when can detect with test specimen 11 to be measured) retrain with the support of test specimen 11 the same terms to be measured.The second acceleration transducer 22, second acceleration transducer 22 is pasted on the surface with test specimen 11 same position place to be measured more identical with the first acceleration transducer 12 model at intact test specimen 21.Apply the exciting force identical with test specimen 11 to be measured by the second vibrator 23 to intact test specimen 21 again, the second acceleration transducer 22 detects the acceleration transducer signals of intact component 21, and wherein, the second vibrator 23 is identical with the first vibrator 13 model.The acceleration transducer signals of intact component 21 is gathered again by the second Dynamic Data Acquiring disposal system 24, and output modalities frequency data.The model frequency of intact test specimen is gone out again according to model frequency Plotting data.In addition, can be input to after obtaining the model frequency of intact test specimen 21 in first Dynamic Data Acquiring disposal system 14 of step 5 and contrast, the disposal system by other simultaneously after also can exporting contrasts, or can manually contrast, and repeats no more.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (3)
1. a component damage detection method, is characterized in that, comprises the steps:
Step one, yardstick according to test specimen to be measured, carry out the support constraint of predetermined condition on the first worktable by described test specimen to be measured;
Step 2, at described test specimen surface uniform to be measured dispersion stickup first acceleration transducer;
Step 3, apply exciting force to described component to be measured by the first vibrator, described first acceleration transducer detects the acceleration transducer signals that described component to be measured produces under described exciting force effect;
Step 4, gather described acceleration transducer signals by the first Dynamic Data Acquiring disposal system, and output modalities frequency data;
Step 5, go out the model frequency of described test specimen to be measured according to described model frequency Plotting data, the model frequency of described test specimen to be measured and the model frequency of intact test specimen are contrasted, judge whether described test specimen to be measured has damage according to comparison structure, the shape of wherein said intact test specimen, structure and material are all identical with described test specimen to be measured.
2. component damage detection method according to claim 1, is characterized in that, before described step one, also comprises the step of the model frequency measuring described intact test specimen:
Described intact test specimen is carried out on described first worktable retrain with the support of described test specimen the same terms to be measured;
Described intact surface of test piece pastes described first acceleration transducer with described test specimen same position place to be measured;
Apply the exciting force identical with described test specimen to be measured by described first vibrator to described intact test specimen, described first acceleration transducer detects the acceleration transducer signals of described intact component;
The acceleration transducer signals of described intact component is gathered by described first Dynamic Data Acquiring disposal system, and output modalities frequency data;
The model frequency of described intact test specimen is gone out according to described model frequency Plotting data.
3. component damage detection method according to claim 1, is characterized in that, also comprises the step of the model frequency of the described intact test specimen of measurement synchronously carried out to step 4 with described step one:
Described intact test specimen is carried out on described second worktable retrain with the support of described test specimen the same terms to be measured;
Described intact surface of test piece pastes the second acceleration transducer with described test specimen same position place to be measured, and described second acceleration transducer is identical with described first acceleration transducer model;
The exciting force identical with described test specimen to be measured is applied to described intact test specimen by the second vibrator, described second acceleration transducer detects the acceleration transducer signals of described intact component, wherein, described second vibrator is identical with described first vibrator model;
The acceleration transducer signals of described intact component is gathered by the second Dynamic Data Acquiring disposal system, and output modalities frequency data;
The model frequency of described intact test specimen is gone out according to described model frequency Plotting data.
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| CN201510350061.5A CN104897353A (en) | 2015-06-23 | 2015-06-23 | Member damage detection method |
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| CN201510350061.5A CN104897353A (en) | 2015-06-23 | 2015-06-23 | Member damage detection method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198383A (en) * | 2016-09-13 | 2016-12-07 | 上海海事大学 | The nondestructive detection system of a kind of small size component top layer microfissure and method |
| CN106370490A (en) * | 2016-08-29 | 2017-02-01 | 中国航空工业集团公司西安飞机设计研究所 | Test-piece initial crack duplicating device and method |
| CN109001034A (en) * | 2018-08-10 | 2018-12-14 | 同济大学 | A kind of test method damped after Damage for Brittle Material |
| CN109765038A (en) * | 2017-11-10 | 2019-05-17 | 财团法人工业技术研究院 | The deterioration method for detecting of the structural member of application structure unit |
| CN112710742A (en) * | 2020-12-22 | 2021-04-27 | 中国航空工业集团公司沈阳飞机设计研究所 | Nondestructive testing method for glass damage of aircraft canopy framework |
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| CN203385699U (en) * | 2013-07-01 | 2014-01-08 | 上海三一重机有限公司 | System for detecting residual stress and structure defect |
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| CN106370490A (en) * | 2016-08-29 | 2017-02-01 | 中国航空工业集团公司西安飞机设计研究所 | Test-piece initial crack duplicating device and method |
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| US10801914B2 (en) | 2017-11-10 | 2020-10-13 | Industrial Technology Research Institute | Method for detecting deterioration defect of structural part using structural unit |
| CN109001034A (en) * | 2018-08-10 | 2018-12-14 | 同济大学 | A kind of test method damped after Damage for Brittle Material |
| CN112710742A (en) * | 2020-12-22 | 2021-04-27 | 中国航空工业集团公司沈阳飞机设计研究所 | Nondestructive testing method for glass damage of aircraft canopy framework |
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