CN102607937A - Contact interface normal stiffness scanning type measuring system based on computer vision - Google Patents
Contact interface normal stiffness scanning type measuring system based on computer vision Download PDFInfo
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- CN102607937A CN102607937A CN2012100651253A CN201210065125A CN102607937A CN 102607937 A CN102607937 A CN 102607937A CN 2012100651253 A CN2012100651253 A CN 2012100651253A CN 201210065125 A CN201210065125 A CN 201210065125A CN 102607937 A CN102607937 A CN 102607937A
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Abstract
The invention discloses a contact interface normal stiffness scanning type measuring system based on computer vision, which comprises a scanning floor stand mechanism and a measurement and acquisition system. According to the contact interface normal stiffness scanning type measuring system based on computer vision, a computer vision technology is combined with a contact interface normal stiffness equivalent model theory, so that a novel measuring system for measuring contact interface normal stiffness is formed. The fundamental principles are as follows: respectively marking a general elastic plastic layer and an elastic-plastic influence contained contact layer on an interface, carrying out visual pattern treatment before and after loading to obtain different layer dependent variables, and further calculating to obtain contact interface equivalent normal contact stiffness for guiding system dynamics design and assembly technology improvement. A practical test shows that: the contact interface normal stiffness scanning type measuring system based on computer vision not only is applied to experimental study, but also is absolutely applied to measurement test requirements of actual conditions, and can be used for finishing measurement of stiffness of a static interface and a dynamic interface simultaneously. Compared with a traditional ultrasonic interface contact stiffness measurement method, the system is more accurate and has a wider application range.
Description
[technical field]
The invention belongs to contact interface kinetic parameter field of measurement, be specifically related to a kind of contact interface normal stiffness scanning formula measuring system based on computer vision.
[background technology]
Along with the high speed development of heavy mechanical equipments such as high precision machine tool, heavy duty gas turbine and carrier rocket, some were begun to become key by the problem that the people ignores in the past.Wherein, a large amount of contact interfaces that exist have cut off the whole continuity of equipment in the device structure, and have shown the non-linear of height, directly influence the power performance of main equipment.
The measurement of contact stiffness in the past only rests on the experimental study stage, has provided a kind of method that is applicable to the ultrasonic measurement contact stiffness of experiment in the foreign literature, (sees document B.W.Drinkwater; R.S.Dwyer-Joyce and P.Cawley; 1996, ' A Study of the Interaction between Ultrasound and a Partially Contacting Solid-Solid Interface, ' Proc.R.Soc.London; Ser.A; 452, however pp.2613-2628.) its essence is the scraggly contact area of reflection surface of contact, can not count the influence of contact layer plastic yield to contact stiffness; Its measurement result is all bigger than normal than calculated value and truth, and the measurement accuracy that draws is relatively poor.In the practical application, because the geometrical property of contact interface and installation site restriction make hyperacoustic measuring method can't be applied to engineering reality.
At home; The patent " a kind of contact interface static method is to the contact stiffness measurement mechanism " (patent publication No. CN 201876396U) that China national Department of Intellectual Property announces adopts axial extended device directly to measure load and displacement between contact interface; Obtain rigidity then; And axially extended device adopts two blades to be clamped in respectively on two test specimens to be measured in measuring process; Set up measurement mechanism and to be measured 's mechanical connection, the measurement influence that can't avoid local deformation to bring, and can't be applied to operating mode.Do not separate general elastoplasticity layer and contact layer in theory fully, can't instruct checking for theoretical research provides.
[summary of the invention]
The object of the invention is to realize a kind of measuring system to Machinery Ministry contact interface normal stiffness, further improves mechanical system power design level, and is the main equipment assembly technology contact interface normal direction contact stiffness pick-up unit efficiently of providing convenience.
To achieve these goals, the present invention adopts following technical scheme:
A kind of contact interface normal stiffness scanning formula measuring system based on computer vision comprises scanning stand mechanism and measures acquisition system;
Scanning stand mechanism comprises magnetic force base, motion guide rail, slide, column set collar, column, column vernier ring, object distance fine setting supporting plate, highly micro-adjusting mechanism, locking knob and three teeth are drawn header; Said motion guide rail connects magnetic force base and slide, and column vertically is anchored on the slide through the column set collar; Height micro-adjusting mechanism and three teeth are drawn the relative 180 degree configuring fixed of header and are installed in column vernier ring both sides; Column vernier ring is slidingly mounted on the column, and locking knob is used for lock post vernier ring height; Object distance fine setting supporting plate is fixedly installed on the height micro-adjusting mechanism, is used for driving measurement harvester adjustment object distance;
Measure acquisition system and comprise zoom lens, industrial camera, data line and computing machine; Zoom lens is installed on the industrial camera, and industrial camera is fixed on the object distance fine setting supporting plate; Industrial camera connects computing machine through data line.
The present invention further improves and is: three teeth are drawn header and are comprised second tooth in the middle of being positioned at and be arranged at second tooth first tooth and the 3rd tooth of both sides up and down.
The present invention further improves and is: adopt three teeth to draw header and draw timestamp on surface to be measured, first tooth and the drawn mark of second tooth and the drawn mark of the 3rd tooth lay respectively at the both sides up and down of the coarse contact interface of upper and lower contact formation.
The present invention further improves and is: the spacing between first tooth and second tooth is less than the spacing between second tooth and the 3rd tooth.
The present invention further improves and is: the spacing between first tooth and second tooth is 3mm, and the spacing between second tooth and the 3rd tooth is 5mm.
Compared with prior art, the present invention has the following advantages: the present invention combines computer vision technique and contact interface normal stiffness equivalent model theory, has formed a kind of measuring system of measurement contact interface normal stiffness of novelty.Ultimate principle be through general elastoplasticity layer on the mark interface respectively with comprise the elasto-plastic effect contact layer; Utilize visual pattern to handle before and after loading and obtain the different layers dependent variable; And then calculate the contact interface method of equal effects to contact stiffness, be used in reference to guiding systems dynamics Design and assembly technology and improve.Actual test shows, the present invention is not only applicable to experimental study, is applicable to the measurement check demand of actual condition fully yet, and it can be accomplished static and dynamic interface rigidity measurement simultaneously; Ultrasound wave interface contact stiffness measuring method than in the past is more accurate, and the scope of application is wider.
Scanning stand mechanism adopts guide rail, column, micro-adjusting mechanism etc. to realize the motion and the location of three directions, and the surface scanning and measuring two-dimentional for surface of contact provides architecture basics.
Adopt mechanical stroke of mark mechanism and contactless measurement scheme, make measuring system work do not measured the subject surface material with pattern limits, the scope of application is expanded.
Column vernier, micro-adjusting mechanism and three teeth are drawn header and are adopted incorporate structure, make mark carry out in same physical construction with measuring, and the error of having brought when having avoided intermediary agency and having changed the outfit has improved measuring accuracy.
Employing can three mutual movement in vertical direction scanning stand mechanisms and the visual pattern technology, make scanning formula measuring system measure static and dynamic object in real time.
[description of drawings]
Fig. 1 is for measuring the acquisition system synoptic diagram;
Fig. 2 is a scanning stand structural scheme of mechanism;
Fig. 3 measures the comparison diagram of (literature value and measured value) and Theoretical Calculation normal direction contact stiffness to contact stiffness for new method of the present invention and ultrasonic method;
Fig. 4 is new method of the present invention and Theoretical Calculation normal direction contact stiffness contrast enlarged drawing.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.Should be understood that these instances only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can make various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Basic thought of the present invention is that computer vision technique and contact interface normal stiffness equivalent model theory are combined, and has formed a kind of measuring system of measurement contact interface normal stiffness of novelty.Ultimate principle is to utilize industrial camera and three teeth to draw header; Through general elastoplasticity layer on the mark interface respectively with comprise the elasto-plastic effect contact layer; Utilize visual pattern to handle before and after loading and obtain the different layers dependent variable, and then calculate the contact interface method of equal effects to contact stiffness.
See also Fig. 1 and shown in Figure 2; The present invention is based on the contact interface normal stiffness scanning formula measuring system of computer vision, form with the measurement acquisition system, both comprised that equipment is prepared in the measurement in early stage by scanning stand mechanism; Comprising follow-up Treatment Analysis again, is a cover total solution.Scanning stand mechanism is used for support measuring harvester, and the micro-adjusting mechanism of arranging it on provides horizontal and vertical two directions motion and locatees, and three teeth draw header 10 can be at marking on the position accurately, and can guarantee the accurate distance between mark; Measure acquisition system and be responsible for that real contact interface situation is transferred to computing machine with the mode of visual pattern and carry out Treatment Analysis, obtain the strained situation of the contact layer that mark position divides, thereby calculate equivalent contact stiffness curve.
See also shown in Figure 2ly, scanning stand mechanism comprises that magnetic force base 1, motion guide rail 2, slide 3, column set collar 4, column 5, column vernier ring 6, object distance fine setting supporting plate 7, height micro-adjusting mechanism 8, locking knob 9 and three teeth draw header 10.Motion guide rail 2 connects magnetic force base 1 and slide 3, and column 5 vertically is anchored on the slide 3 through column set collar 4; Height micro-adjusting mechanism 8 and three teeth are drawn header 10 relative 180 degree configurations, are fixedly mounted on column vernier ring 6 both sides; Column vernier ring 6 is slidingly mounted on the column 5, and locking knob 9 is used for lock post vernier ring 6 height; Three teeth are drawn header 10 and are adopted three tooth-like mechanisms, guarantee the accurate distance between mark line; Object distance fine setting supporting plate 7 is fixedly installed on the height micro-adjusting mechanism 8, can drive to measure harvester adjustment object distance, obtains the visual pattern information that clear, the to be measured label range of mark covers whole visual field.
Concrete operations: see also shown in Figure 1ly, scanning stand mechanism is fixing through magnetic force base 1 absorption, guarantees that three teeth draw 10 3 lines of header perpendicular to contact interface to be measured; Sliding up and down column vernier ring 6 and fine setting height micro-adjusting mechanism 8 makes contact interface be positioned at three teeth to draw header 10 ideal mark scopes, locking knob 9; Moving sliding base 3 reaches with upper-part on guide rail 2, and three teeth that three teeth are drawn header 10 stay clear marking 2-1,2-3,2-4 on surface to be measured.Unclamp locking knob 9 then, three teeth are drawn header 10 go to rear side, make the object distance fine setting supporting plate 7 that is fixed on the fine setting height micro-adjusting mechanism 8 towards contact interface one side to be measured.
See also shown in Figure 1ly, measure zoom lens 1-1, industrial camera 1-2, data line 1-3 and computing machine 1-4 that acquisition system comprises millions resolution.Concrete operations: assembly industry camera 1-2 and zoom lens 1-1, fixedly industrial camera 1-2 is on object distance fine setting supporting plate 7; Connect industrial camera 1-2 and computing machine 1-4 with data line 1-3; According to desired indicator adjustment focal length and object distance, make the measurement face marking image clean mark of computing machine 1-4 output, label range to be measured covers whole visual field.
Computer vision technique and contact interface normal stiffness equivalent model theory are combined, formed a kind of measuring system of measurement contact interface normal stiffness of novelty; But the visual pattern information in the loading procedure of its dynamic acquisition; Handle through block matching algorithm and sub-pix; The accurate fast two dimensional motion situation that gauge point is followed the trail of in search on measurement plane; Obtain the relative strain displacement of a plurality of gauge points in different measuring position; Characterize the contact layer strain with the relative displacement difference, (concrete computing method disclose CN102169065A number referring to Chinese patent: a kind of big contact interface normal stiffness measuring method of taking into account the plasticity influence fully) thereby calculate the contact interface normal stiffness.
Embodiment 1
Referring to Fig. 1, measure face marking 2-3,2-4 at last contact, measure face marking 2-1 at following contact; Contact forms coarse contact interface 2-2 up and down; Interface roughness 0.8um, between mark 2-1 and the mark 2-3 apart from 5mm, between mark 2-4 and the mark 2-3 apart from 3mm; Contact is loaded on 350MPa in proper order up and down, and the contact interface normal stiffness that calculates is referring to Fig. 3,4.
Find out that from Fig. 3,4 the image method experiment value is identical with the calculated value rule, magnitude is identical, and the little and theoretical value of numerical value difference is verified each other.More near calculated value, this is because image method has overcome the shortcoming that ultrasonic method can't be taken into account influence of surface of contact pattern and the influence of contact layer plastic yielding fully, the model of approaching more equivalent microcosmic elasto-plastic Contact layer to image method than the experiment value of ultrasonic method.
Claims (5)
1. the contact interface normal stiffness scanning formula measuring system based on computer vision is characterized in that, comprises scanning stand mechanism and measures acquisition system;
Scanning stand mechanism comprises magnetic force base (1), motion guide rail (2), slide (3), column set collar (4), column (5), column vernier ring (6), object distance fine setting supporting plate (7), highly micro-adjusting mechanism (8), locking knob (9) and three teeth are drawn header (10); Said motion guide rail (2) connects magnetic force base (1) and slide (3), and column (5) vertically is anchored on the slide (6) through column set collar (4); Height micro-adjusting mechanism (8) and three teeth are drawn the relative 180 degree configuring fixed of header (10) and are installed in column vernier ring (6) both sides; Column vernier ring (6) is slidingly mounted on the column (5), and locking knob (9) is used for lock post vernier ring (6) highly; Object distance fine setting supporting plate (7) is fixedly installed on the height micro-adjusting mechanism (8), is used for driving measurement harvester adjustment object distance;
Measure acquisition system and comprise zoom lens (1-1), industrial camera (1-2), data line (1-3) and computing machine (1-4); Zoom lens (1-1) is installed on the industrial camera (1-2), and industrial camera (1-2) is fixed on the object distance fine setting supporting plate (7); Industrial camera (1-2) connects computing machine (1-4) through data line (1-3).
2. a kind of contact interface normal stiffness scanning formula measuring system based on computer vision according to claim 1 is characterized in that, three teeth are drawn header (10) and comprised second tooth in the middle of being positioned at and be arranged at second tooth first tooth and the 3rd tooth of both sides up and down.
3. a kind of contact interface normal stiffness scanning formula measuring system according to claim 2 based on computer vision; It is characterized in that; Adopt three teeth to draw header (10) and draw timestamp on surface to be measured, first tooth and the drawn mark of second tooth (2-4,2-3) and the drawn mark of the 3rd tooth (2-1) lay respectively at the both sides up and down of the coarse contact interface (2-2) of upper and lower contact formation.
4. a kind of contact interface normal stiffness scanning formula measuring system based on computer vision according to claim 2 is characterized in that the spacing between first tooth and second tooth is less than the spacing between second tooth and the 3rd tooth.
5. a kind of contact interface normal stiffness scanning formula measuring system based on computer vision according to claim 2 is characterized in that the spacing between first tooth and second tooth is 3mm, and the spacing between second tooth and the 3rd tooth is 5mm.
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| CN201210065125.3A CN102607937B (en) | 2012-03-13 | 2012-03-13 | Contact interface normal stiffness scanning type measuring system based on computer vision |
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| CN201210065125.3A CN102607937B (en) | 2012-03-13 | 2012-03-13 | Contact interface normal stiffness scanning type measuring system based on computer vision |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104476607A (en) * | 2014-10-16 | 2015-04-01 | 西安交通大学 | Screw type transverse cutting machine tool setting testing system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2004105637A (en) * | 2004-02-24 | 2005-08-10 | НПФ "Нуклеус" (RU) | DEVICE FOR DEFINITION OF RIGIDITY OF Nipple Rubber |
| CN102169065A (en) * | 2011-01-19 | 2011-08-31 | 西安交通大学 | Method for measuring normal rigidity of large contact interface by completely considering plastic influence |
| CN102435607A (en) * | 2011-12-20 | 2012-05-02 | 沈机集团昆明机床股份有限公司 | Image-based measuring device for normal contact stiffness of assembled jointing surface of large-size machine tool |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2004105637A (en) * | 2004-02-24 | 2005-08-10 | НПФ "Нуклеус" (RU) | DEVICE FOR DEFINITION OF RIGIDITY OF Nipple Rubber |
| CN102169065A (en) * | 2011-01-19 | 2011-08-31 | 西安交通大学 | Method for measuring normal rigidity of large contact interface by completely considering plastic influence |
| CN102435607A (en) * | 2011-12-20 | 2012-05-02 | 沈机集团昆明机床股份有限公司 | Image-based measuring device for normal contact stiffness of assembled jointing surface of large-size machine tool |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104476607A (en) * | 2014-10-16 | 2015-04-01 | 西安交通大学 | Screw type transverse cutting machine tool setting testing system and method |
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