CN104075653A - Strain capacity testing system based on orthogonal strain gauge array - Google Patents
Strain capacity testing system based on orthogonal strain gauge array Download PDFInfo
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- CN104075653A CN104075653A CN201410145712.2A CN201410145712A CN104075653A CN 104075653 A CN104075653 A CN 104075653A CN 201410145712 A CN201410145712 A CN 201410145712A CN 104075653 A CN104075653 A CN 104075653A
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Abstract
The invention relates to a strain capacity testing system based on an orthogonal strain gauge array. The testing system comprises a PVC hollow tube, a gelatin body, strain gauges, a light source system, an image collecting system, a data collecting system and a data processing system. Four or more strain gauges are pasted on the outer surface of the PVC hollow tube, and the strain gauges on the PVC hollow tube are orthogonally arranged. A connecting line is led out of the outer end of each strain gauge through a wiring terminal. The PVC hollow tube which is provided with the strain gauges in a pasting mode is solidified in the cubic gelatin body, the PVC hollow tube is perpendicular to the bottom face of the gelatin body, and the connecting line of each strain gauge is exposed out of the gelatin body. Each strain gauge is connected with the input end of the data collecting system through the corresponding connecting line. The output end of the image collecting system and the output end of the data collecting system are connected with the data processing system. The strain capacity testing system based on the orthogonal strain gauge array is high in reliability, good in testing precision and capable of being widely applied to the testing technical field.
Description
Technical field
The present invention relates to a kind of strain measurement test system based on orthogonal strain chip arrays, belong to technical field of measurement and test.
Background technology
In spherical fragmentation penetration gelatin body process, the dependent variable delta data that gelatin body internal simulation bone is produced is an important content measurement evaluating fragmentation damage effect.The dependent variable test of traditional spherical fragmentation penetration gelatin body is as simulation bone at PVC hollow tubular of the inner placement of gelatin body, in the centre position of the outside surface of this root PVC hollow tubular, paste a slice foil gauge as sensor, measure in spherical fragmentation penetration gelatin body process the data that change in the inner dependent variable producing of gelatin body.But; spherical fragmentation is in penetration gelatin body process; the data that often can make to be pasted on the foil gauge damage of PVC hollow tubular outside surface and cause obtaining dependent variable; simultaneously; the strain measurement test system of traditional spherical fragmentation penetration gelatin body; due to the dispersiveness of spherical fragmentation penetration position with lack the compensation of the test data that miscellaneous equipment obtains, only rely on the test data that a slice foil gauge obtains often can accurately not reflect that gelatin body is by the delta data of the dependent variable of penetration position.
Summary of the invention
The object of the invention is the reliability of dependent variable testing experiment and the measuring accuracy of dependent variable in order to improve spherical fragmentation penetration gelatin body, and propose a kind of strain measurement test system based on orthogonal strain chip arrays.
The object of the invention is to be achieved through the following technical solutions.
A kind of strain measurement test system based on orthogonal strain chip arrays of the present invention, comprises PVC hollow tubular, gelatin body, foil gauge, light-source system, image capturing system, data acquisition system (DAS), data handling system;
Light-source system is used for making gelatin body in pellucidity, is conducive to image capturing system and obtains image clearly;
Image capturing system is used for gathering the instantaneous velocity data of target penetration gelatin;
Data acquisition system (DAS) is used for gathering the resistance change data of foil gauge output;
Data handling system becomes dependent variable delta data by resistance change data with instantaneous velocity data-switching;
Four above strain gauge adhesions are in the outside surface of a PVC hollow tubular, the orthogonal thereto layout of foil gauge on PVC hollow tubular, and between any two foil gauge centers, interval is greater than 10mm; The outer end of every foil gauge is by connection terminal outconnector; The PVC hollow tubular that is pasted with foil gauge is set in and is shaped as in cubical gelatin body, and PVC hollow tubular is perpendicular to the bottom surface of gelatin body, and the connecting line of each foil gauge is exposed outside gelatin body;
Each foil gauge is exposed to be connected with the input end of data acquisition system (DAS) at the external connecting line of gelatin;
Light-source system and image capturing system are separately positioned on the both sides of gelatin body, and the system image acquisition direction of the direction of illumination of light-source system and image acquisition is all vertical with PVC hollow tubular;
The output terminal connection data disposal system of image capturing system, data acquisition system (DAS).
The course of work
The transmit direction of transmitter is vertical with the PVC hollow tubular in gelatin body, and the just installed surface to foil gauge at least one foil gauge on PVC hollow tubular, transmitter transmitting spherical fragmentation, make its penetration gelatin body, make the PVC hollow tubular in gelatin body produce strain, the foil gauge on PVC hollow tubular is to data acquisition system (DAS) output resistance delta data; Image capturing system gathers the instantaneous velocity data of target penetration gelatin simultaneously; Data acquisition system (DAS) and image capturing system respectively by the instantaneous velocity data transmission of the resistance change data that collect and target penetration gelatin to data handling system, data handling system becomes dependent variable delta data by resistance change data with the instantaneous velocity data-switching of target penetration gelatin body.
Beneficial effect:
1, a kind of strain measurement test system based on orthogonal strain chip arrays that the present invention proposes, owing to four above foil gauges being disperseed to be pasted on the outside surface of a PVC hollow tubular, can ensure in test process, in the impaired situation of certain a slice foil gauge, still can obtain the data of other foil gauge output, increase the reliability of dependent variable test;
2, a kind of strain measurement test system based on orthogonal strain chip arrays that the present invention proposes, disperses orthogonal thereto mode to be pasted on the outside surface of a PVC hollow tubular four above foil gauges, thereby has formed orthogonal foil gauge array; The calculating of computer system, compare with traditional single foil gauge test data, utilize the test data of orthogonal foil gauge array, can draw more accurately the delta data of spherical fragmentation dependent variable to the inner generation of gelatin body in different penetrations position, thereby reduce the impact of the corresponding variable test precision of dispersiveness of spherical fragmentation penetration position;
3, a kind of strain measurement test system based on orthogonal strain chip arrays that the present invention proposes, the instantaneous velocity data of spherical fragmentation penetration in gelatin body have been obtained by image capturing system independently, as the compensation of foil gauge output data, by data handling system, the resistance change data of foil gauge output are become to dependent variable delta data with the instantaneous velocity data-switching of target penetration gelatin body.Compare by the dependent variable delta data obtaining with the computer simulation system under same test condition, the precision that the new strain measurement test system based on orthogonal strain chip arrays proposing is measured dependent variable brings up to 20% by original 45%.
Brief description of the drawings
Fig. 1 is the strain measurement test system schematic diagram based on orthogonal strain chip arrays;
Fig. 2 is that foil gauge is at PVC hollow tubular outside surface paste position schematic diagram;
Fig. 3 is three PVC hollow tubulars schematic layout patterns in gelatin;
Wherein, 1-transmitter; 2-spherical fragmentation; 3-gelatin body; 4-PVC hollow tubular; 5-foil gauge; 6-light-source system; 7-data acquisition system (DAS); 8-image capturing system; 9-data handling system; 10-connection terminal.
Embodiment
Below in conjunction with drawings and Examples, content of the present invention is elaborated.
Embodiment
A kind of strain measurement test system based on orthogonal strain chip arrays of the present invention, as shown in Figure 1, comprises PVC hollow tubular 4, gelatin body 3, foil gauge 5, light-source system 6, image capturing system 8, data acquisition system (DAS) 7, data handling system 9;
Image capturing system 8 adopts high-speed camera, is used for gathering the instantaneous velocity data of target penetration gelatin;
Data acquisition system (DAS) 7 adopts the PXIe data collecting card of America NI company, is used for gathering the resistance change data of foil gauge output;
Data handling system 9 is the computer system of service data handling procedure, and resistance change data are become to dependent variable delta data with instantaneous velocity data-switching;
Be pasted with six foil gauges at the outside surface of a PVC hollow tubular, as shown in Figure 2, wherein, three foil gauges are arranged along the axis direction of PVC hollow tubular, and three foil gauge mounting planes are parallel, and each foil gauge is spaced apart 50mm between center, other three foil gauges are arranged in the center of PVC hollow tubular, even circumferential along PVC hollow tubular is arranged, and each foil gauge is spaced apart 15mm between center, makes six foil gauges form orthogonal foil gauge array; The outer end of each foil gauge is by connection terminal 10 outconnectors; As shown in Figure 3, the PVC hollow tubular that is pasted with six foil gauges is set in the cube gelatin body that is shaped as 400mm × 400mm × 400mm, using gelatin body bottom surface as xy plane, PVC hollow tubular is (300 at the subpoint coordinate of gelatin body bottom surface, 200,0); The connecting line of each foil gauge is exposed outside gelatin body;
The PVC hollow tubular that is pasted with foil gauge is set in and is shaped as in cubical gelatin body, and PVC hollow tubular is perpendicular to the bottom surface of gelatin body, and the connecting line of each foil gauge is exposed outside gelatin body;
Each foil gauge is exposed to be connected with the input end of data acquisition system (DAS) at the external connecting line of gelatin;
Light-source system and image capturing system are separately positioned on the left and right sides of gelatin body, and the system image acquisition direction of the direction of illumination of light-source system and image acquisition is all vertical with PVC hollow tubular; Light-source system 6, for making gelatin body in pellucidity, is conducive to image capturing system and obtains image clearly;
The output terminal connection data disposal system of image capturing system, data acquisition system (DAS).
The course of work
As shown in Figure 1, the transmit direction of transmitter 1 is vertical with the PVC hollow tubular in gelatin body, and the just installed surface at PVC hollow tubular to foil gauge, transmitter 1 is launched spherical fragmentation 2, make its penetration gelatin body 3, make the PVC hollow tubular in gelatin body produce strain, the foil gauge on PVC hollow tubular is to data acquisition system (DAS) output resistance delta data; Image capturing system gathers the instantaneous velocity data of target penetration gelatin simultaneously; Data acquisition system (DAS) and image capturing system respectively by the instantaneous velocity data transmission of the resistance change data that collect and target penetration gelatin to data handling system, data handling system becomes dependent variable delta data by resistance change data with the instantaneous velocity data-switching of target penetration gelatin body.
Claims (1)
1. the strain measurement test system based on orthogonal strain chip arrays, is characterized in that: comprise PVC hollow tubular, gelatin body, foil gauge, light-source system, image capturing system, data acquisition system (DAS), data handling system;
Image capturing system is used for gathering the instantaneous velocity data of target penetration gelatin;
Data acquisition system (DAS) is used for gathering the resistance change data of foil gauge output;
Data handling system becomes dependent variable delta data by resistance change data with instantaneous velocity data-switching;
Four above strain gauge adhesions are in the outside surface of a PVC hollow tubular, the orthogonal thereto layout of foil gauge on PVC hollow tubular, and between any two foil gauge centers, interval is greater than 10mm; The outer end of every foil gauge is by connection terminal outconnector; The PVC hollow tubular that is pasted with foil gauge is set in and is shaped as in cubical gelatin body, and PVC hollow tubular is perpendicular to the bottom surface of gelatin body, and the connecting line of each foil gauge is exposed outside gelatin body;
Each foil gauge is exposed to be connected with the input end of data acquisition system (DAS) at the external connecting line of gelatin;
Light-source system and image capturing system are separately positioned on the both sides of gelatin body, and the system image acquisition direction of the direction of illumination of light-source system and image acquisition is all parallel with PVC hollow tubular;
The output terminal connection data disposal system of image capturing system, data acquisition system (DAS).
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| CN201410145712.2A CN104075653A (en) | 2014-04-10 | 2014-04-10 | Strain capacity testing system based on orthogonal strain gauge array |
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| CN201410145712.2A CN104075653A (en) | 2014-04-10 | 2014-04-10 | Strain capacity testing system based on orthogonal strain gauge array |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424721A (en) * | 2015-12-11 | 2016-03-23 | 南京神源生智能科技有限公司 | Metal strain gauge defect automatic detection system |
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| CN105424721A (en) * | 2015-12-11 | 2016-03-23 | 南京神源生智能科技有限公司 | Metal strain gauge defect automatic detection system |
| CN105424721B (en) * | 2015-12-11 | 2018-07-13 | 南京神源生智能科技有限公司 | A kind of metal strain meter defect automatic checkout system |
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