CN103344483A - Strain sensor for measuring flexible fabric stress effect - Google Patents
Strain sensor for measuring flexible fabric stress effect Download PDFInfo
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- CN103344483A CN103344483A CN2013102290771A CN201310229077A CN103344483A CN 103344483 A CN103344483 A CN 103344483A CN 2013102290771 A CN2013102290771 A CN 2013102290771A CN 201310229077 A CN201310229077 A CN 201310229077A CN 103344483 A CN103344483 A CN 103344483A
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Abstract
A disclosed strain sensor for measuring flexible fabric stress effect comprises an inner core, a nylon cloth strip, an arc-shaped substrate and a foil gauge which are successively disposed from inside to outside; the two ends of the nylon cloth strip are led out from gaps between the inner core and the arc-shaped substrate; and the foil gauge is adhered to the outer surface of the arc-shaped substrate. The stress sensor is applicable to measuring stretching stress of a flexible fabric, especially the dynamic stress change of a parachute canopy in a parachute-opening process. Compared with the conventional Omega sensor, the strain sensor of the invention is simple and reliable in the method of deploying on a fabric, and completely overcomes the main advantages that operation is tedious and the sensor is easy to damage in a transfer process of the Omega sensor from a calibration fabric to a measurement fabric.
Description
Technical field
The invention belongs to sensor field, relate to a kind of strain transducer of measuring the flexible fabric strain.
Background technology
Parachute has important status in fields such as military, civilian, Aero-Space.The canopy stress measurement of parachute is blank and the difficult point during airdrop test is measured always, and stressing conditions can provide important data to support for development and the improvement of novel parachute accurately, has significant science and military significance.Parachute parachute-opening process is the dynamic process that the high speed of a transient state changes, the stressed back of material shape sharply changes in this course, performance has larger difference under stress and the strength of materials, length growth rate and the quiescent conditions, at present also do not have complete theory can accurately calculate this process, can only rely on test to carry out analysis verification.Yet canopy itself is flexible material, and surface area is big in addition, and environment is abominable in the course of the work, with respect to test model lasting relative motion is arranged again simultaneously, challenges greatly so surveying work is one.
At the beginning of the 80's, each research institution has carried out multinomial experiment around the canopy stress measurement of parachute in the world, however in all experiments, only the Omega sensor (Journal of Aircraft, 1978,15,534-539) obtained success.The structure of Omega sensor as shown in Figure 8.
Foil gauge (1) is bonded on the arc substrate (2); Article two, an end perk of nylon cloth (4) sticks to respectively on the inwall of arc substrate, and the other end of two cloths then is adhered fixed simultaneously on canopy (6).The measuring principle of Omega sensor based on: after canopy is stressed, can cause the canopy elongation, this variation meeting is delivered on the arc substrate by the nylon cloth, make the flexibility of arc substrate produce deformation, this deformation meeting is by the foil gauge perception, be reflected as the variation of current signal, thereby set up the corresponding relation between a canopy stress and strain sheet current signal, realize the stress measurement to bell.
The Omega sensor is in specific implementation process, and it is fixed to be adhered fixed earlier at an enterprising rower of canopy cloth, namely utilizes puller system that the canopy cloth is applied accurate pulling force, records canopy stress--the typical curve of foil gauge current signal; Then this Omega sensor is taken off from the canopy cloth, be adhered fixed again on the bell in the airdrop test; In the airdrop test, utilize sensor data acquisition, obtain time dependent dynamic strain sheet current signal data, with reference to the canopy stress of demarcating previously--foil gauge current signal typical curve finally records time dependent dynamic canopy stress situation.
Yet, there is a significant disadvantages in the Omega sensor: because the Omega sensor is adhered fixed on the nylon cloth, so the process that the Omega sensor is shifted to fabric to be measured on demarcating fabric, need very fine work to go to remove the very firm coherent condition of Omega sensor, to wipe the adhesive after the curing residual on the sensor simultaneously off, coat new adhesive then, be fixed on again on the new nylon cloth.This operation is very loaded down with trivial details, and is very easy to cause the breakage of sensor, influences canopy stress--accuracy and the reliability of foil gauge current signal typical curve.
This technological deficiency has greatly influenced the accuracy of detection of Omega sensor and it is in the widespread use of measuring bell stress field.
Summary of the invention
Technical matters:The objective of the invention is to overcome traditional Omega sensor loaded down with trivial details and cause the major defect of sensor breakage easily to measuring on the fabric operation the transfer process on demarcating fabric, provide a class new strain sensor with and measuring flexible fabric, as the purposes on the stress of bell.
Technical scheme:The present invention is a kind of for the strain transducer of measuring the effect of flexible fabric stress, comprise the kernel, nylon cloth, arc substrate and the foil gauge that set gradually from the inside to the outside, draw by the slit between kernel and the arc substrate at the two ends of nylon cloth, and foil gauge is bonded at the outside surface of arc substrate.
Among the present invention, kernel comprises right cylinder and the flange that is positioned at cylindrical two ends, and cylindrical length is identical with the length of arc substrate, and diameter is slightly less than the internal diameter of arc substrate, and the diameter of flange is identical with the external diameter of arc substrate.
Among the present invention, the material of arc substrate is stainless steel, spring steel, constantan or rigid plastic.
The material of kernel is stainless steel, spring steel, constantan or rigid plastic.
The nylon cloth can be filled in just in slit between kernel and arc substrate; One end of kernel arranges dismountable nut, is used for the dismounting kernel, and nut there is no with miscellaneous part and is connected, as shown in Figure 5.
The combined method of apparatus of the present invention is: foil gauge is bonded on the arc substrate; Kernel inserts the arc substrate, tightens nut thereafter; The nylon cloth is drawn the two ends of cloth, thereby can be adhered fixed on flexible fabric by the slit between arc substrate and the kernel.
Sensor of the present invention is most crucial has designed kernel just, utilizes this kernel, and the nylon cloth can directly snap in the arc substrate, and need not to be adhered fixed as the Omega sensor at arc substrate inwall; In addition, finish canopy stress at the demarcation fabric--after the measurement of foil gauge current signal typical curve, can be by the nut of dismounting kernel, take off sensor smoothly, and need not as the Omega sensor, to take to strike off loaded down with trivial details operations such as adhesive, thereby shift sensor quickly and easily to fabric to be measured.
Beneficial effect:The present invention compared with prior art has the following advantages:
The present invention designs the strain transducer that a class can be used for measuring bell stress, than traditional Omega sensor, it has increased kernel portion, make it easy to be reliable in fabric deploy method, it has saved the Omega sensor when reusing, must scrape off the step of original bonding agent, can remove the firm coherent condition of Omega sensor very easily, avoid in removing the bonding agent process damage to sensor arc substrate and foil gauge.Therefore, its maximum advantage is, it has overcome traditional Omega sensor fully loaded down with trivial details and cause the major defect of sensor breakage easily to measuring on the fabric operation the transfer process on demarcating fabric, thereby has improved accuracy and the reliability of canopy stress-strain sheet current signal typical curve.
Description of drawings
Fig. 1 is the foil gauge structural drawing.
Fig. 2 is arc substrat structure figure.
Fig. 3 is the structural drawing of sensor kernel.
Fig. 4 is nylon cloth structural drawing.
Fig. 5 is the dismounting figure of sensor kernel.
Fig. 6 is the sensor construction synoptic diagram.
Fig. 7 is the sectional view of sensor of the present invention.
Fig. 8 is the installation drawing of traditional Omega sensor.
Fig. 9 is in the 8000m airdrop test, utilizes strain transducer to record one group of dynamic stress data plot that umbrella body medium position obtains.
Figure 10 is in the 8000m airdrop test, utilizes strain transducer to record one group of dynamic stress data plot that umbrella body tip position obtains.
Figure 11 is in the 8000m airdrop test, utilizes strain transducer to record one group of dynamic stress data plot of umbrella edge position acquisition at one's side.
Figure 12 is in the 10000m airdrop test, utilizes strain transducer to record one group of dynamic stress data plot that umbrella body medium position obtains.
Have among the figure: foil gauge 1, arc substrate 2, kernel 3, nylon cloth 4, nut 5, barre 6, warp-wise striped 7, canopy 8, warp-wise band 9.
Embodiment
Below in conjunction with Figure of description and example the present invention is done further and to specify.
Strain transducer of the present invention, structure as shown in Figure 6, it is the subassembly that a cover contains the kernel 3, nylon cloth 4, arc substrate 2 and the foil gauge 1 that set gradually from the inside to the outside, draw by the slit between kernel 3 and the arc substrate 2 at the two ends of nylon cloth 4, and foil gauge 1 is bonded at the outside surface of arc substrate 2.
The combined method of strain transducer of the present invention is: foil gauge 1 is bonded on the arc substrate 2; Nut 5 on the kernel 3 is turned on, nylon cloth 4 is wrapped kernel 3 surfaces, then kernel 3 is inserted arc substrate 2 together with the nylon cloth 4 that is wrapped in it, tighten nut 5 thereafter; Like this, nylon cloth 4 just can be by the slit between arc substrate 2 and the kernel 3, and draw from the opening part of arc substrate 2 at its two ends, thereby it can be adhered fixed on flexible fabric or canopy 8.
Wherein, it is that two end boss are circular parts that kernel 3 is screwed on behind the nut 5, and its diameter is identical with the external diameter of arc substrate 2; This parts middle part is cylindrical, and length is identical with the length of arc substrate 2, and diameter then is slightly less than the internal diameter of arc substrate 2, and slit between the two can hold the thickness of nylon cloth 4 just; One end of these parts is dismountable nuts 5, is convenient to sensor and repeatedly uses!
This sensor is adhered fixed on bell 8, measures canopy 8 suffered dynamic stress in the parachute-opening process and change.
Embodiment 1: utilize strain transducer to carry out the stress-voltage responsive envelope test of canopy 8.
The nylon cloth 4 at sensor two ends is smeared liquid-state silicon gel, be adhered fixed then on a kind of 544 bright and beautiful silk canopies 8.Hang 20 kilograms of weights under the parachute, utilize sensor to record the voltage responsive data.When cloth was not hung weight, the initial voltage that sensor records was 12.50 mV; After hanging 20 kilograms of weights under the cloth, the change in voltage that sensor records is 29.45 mV.
Embodiment 2: utilize sensor measurement parachute canopy middle part suffered dynamic stress in the parachute-opening process to change.
The nylon cloth 4 at sensor two ends is smeared liquid-state silicon gel, be adhered fixed the umbrella body middle part at a circular parachute then.Hang 50 kilograms of weights under the parachute, throw in parachute-opening from 8000 meters high-altitudes.Utilize sensor to record parachute canopy middle part dynamic stress delta data in 1.3 seconds after parachute-opening, see Fig. 9.
Embodiment 3: utilize sensor measurement parachute top suffered dynamic stress in the parachute-opening process to change.
The nylon cloth 4 at sensor two ends is smeared liquid-state silicon gel, be adhered fixed then at a circular parachute umbrella top.Hang 50 kilograms of weights under the parachute, throw in parachute-opening from 8000 meters high-altitudes.Utilize sensor to record parachute top dynamic stress delta data in 1.3 seconds after parachute-opening, see Figure 10.
Embodiment 4: utilize sensor measurement parachute skirt position suffered dynamic stress in the parachute-opening process to change.
The nylon cloth 4 at sensor two ends is smeared liquid-state silicon gel, be adhered fixed then at a circular parachute canopy edge.Hang 50 kilograms of weights under the parachute, throw in parachute-opening from 8000 meters high-altitudes.Utilize sensor to record bell 8 dynamic stress delta data in 1.3 seconds after parachute-opening, see Figure 11.
Embodiment 5: utilize sensor measurement parachute canopy middle part suffered dynamic stress in the parachute-opening process to change.
The nylon cloth 4 at sensor two ends is smeared liquid-state silicon gel, be adhered fixed then on a circular bell 8.Hang 50 kilograms of weights under the parachute, throw in parachute-opening from the ten thousand metres high-altitude.Utilize sensor to record bell 8 dynamic stress delta data in 1.3 seconds after parachute-opening, see Figure 12.
Claims (4)
1. strain transducer of be used for measuring the effect of flexible fabric stress, it is characterized in that, this sensor comprises kernel (3), nylon cloth (4), arc substrate (2) and the foil gauge (1) that sets gradually from the inside to the outside, draw by the slit between kernel (3) and the arc substrate (2) at the two ends of described nylon cloth (4), and described foil gauge (1) is bonded at the outside surface of arc substrate (2).
2. according to claim 1 for the strain transducer of measuring the effect of flexible fabric stress, it is characterized in that, described kernel (3) comprises right cylinder and is positioned at the flange at described cylindrical two ends, described cylindrical length is identical with the length of arc substrate (2), diameter is slightly less than the internal diameter of arc substrate (2), and the diameter of described flange is identical with the external diameter of arc substrate (2).
3. according to claim 1 and 2 for the strain transducer of measuring the effect of flexible fabric stress, it is characterized in that the material of described arc substrate (2) is stainless steel, spring steel, constantan or rigid plastic.
4. according to claim 1 and 2 for the strain transducer of measuring the effect of flexible fabric stress, it is characterized in that the material of described kernel (3) is stainless steel, spring steel, constantan or rigid plastic.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848977A (en) * | 2015-04-21 | 2015-08-19 | 北京空间机电研究所 | Manufacturing method of sensor for measuring parachute canopy dynamic stress |
| CN104848976A (en) * | 2015-04-21 | 2015-08-19 | 北京空间机电研究所 | Large-deformation flexible cloth measuring sensor fixing method |
| CN104915509A (en) * | 2015-06-19 | 2015-09-16 | 南京航空航天大学 | Large deformation flexible body dynamic stress measurement information conversion method based on neural networks |
| CN104990658A (en) * | 2015-06-19 | 2015-10-21 | 南京航空航天大学 | Sensor assembly aiming at large-deformation flexible body stress measurement |
| CN110118218A (en) * | 2019-06-06 | 2019-08-13 | 克拉玛依市昂科能源科技有限公司 | Difference strain test specimen strain gauge adhesion method |
| CN110375706A (en) * | 2019-08-21 | 2019-10-25 | 深圳市朋辉科技术有限公司 | A kind of sensing arrangement for road strain measurement |
| CN110779863A (en) * | 2019-11-06 | 2020-02-11 | 江苏集萃安泰创明先进能源材料研究院有限公司 | Method for evaluating residual thermal stress of amorphous alloy thin strip |
| CN111598935A (en) * | 2020-04-23 | 2020-08-28 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111598934A (en) * | 2020-04-23 | 2020-08-28 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111598936A (en) * | 2020-04-23 | 2020-08-28 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111751489A (en) * | 2020-08-03 | 2020-10-09 | 中国计量大学 | Device and method for testing flame retardant property of nano post-treated textile |
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Cited By (19)
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|---|---|---|---|---|
| CN104848976A (en) * | 2015-04-21 | 2015-08-19 | 北京空间机电研究所 | Large-deformation flexible cloth measuring sensor fixing method |
| CN104848976B (en) * | 2015-04-21 | 2017-07-07 | 北京空间机电研究所 | Large deformation flexible fabric measurement sensor fixing means |
| CN104848977A (en) * | 2015-04-21 | 2015-08-19 | 北京空间机电研究所 | Manufacturing method of sensor for measuring parachute canopy dynamic stress |
| CN104915509A (en) * | 2015-06-19 | 2015-09-16 | 南京航空航天大学 | Large deformation flexible body dynamic stress measurement information conversion method based on neural networks |
| CN104990658A (en) * | 2015-06-19 | 2015-10-21 | 南京航空航天大学 | Sensor assembly aiming at large-deformation flexible body stress measurement |
| CN104990658B (en) * | 2015-06-19 | 2017-08-11 | 南京航空航天大学 | A kind of sensor cluster measured for large deformation flexible body stress |
| CN104915509B (en) * | 2015-06-19 | 2017-11-21 | 南京航空航天大学 | Large deformation flexible body dynamic stress metrical information conversion method based on neutral net |
| CN110118218B (en) * | 2019-06-06 | 2020-06-02 | 克拉玛依市昂科能源科技有限公司 | Method for sticking strain gauge of differential strain test piece |
| CN110118218A (en) * | 2019-06-06 | 2019-08-13 | 克拉玛依市昂科能源科技有限公司 | Difference strain test specimen strain gauge adhesion method |
| CN110375706A (en) * | 2019-08-21 | 2019-10-25 | 深圳市朋辉科技术有限公司 | A kind of sensing arrangement for road strain measurement |
| CN110779863A (en) * | 2019-11-06 | 2020-02-11 | 江苏集萃安泰创明先进能源材料研究院有限公司 | Method for evaluating residual thermal stress of amorphous alloy thin strip |
| CN110779863B (en) * | 2019-11-06 | 2022-03-29 | 江苏集萃安泰创明先进能源材料研究院有限公司 | Method for evaluating residual thermal stress of amorphous alloy thin strip |
| CN111598935A (en) * | 2020-04-23 | 2020-08-28 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111598934A (en) * | 2020-04-23 | 2020-08-28 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111598936A (en) * | 2020-04-23 | 2020-08-28 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111598936B (en) * | 2020-04-23 | 2023-03-14 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111598934B (en) * | 2020-04-23 | 2023-04-07 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111598935B (en) * | 2020-04-23 | 2023-04-07 | 福建晶安光电有限公司 | Method and device for measuring bending shape of substrate, storage medium and terminal |
| CN111751489A (en) * | 2020-08-03 | 2020-10-09 | 中国计量大学 | Device and method for testing flame retardant property of nano post-treated textile |
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Application publication date: 20131009 |