CN104034468B - A kind of explosive water shooting near field shock wave pressure measuring method - Google Patents
A kind of explosive water shooting near field shock wave pressure measuring method Download PDFInfo
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- CN104034468B CN104034468B CN201410165831.4A CN201410165831A CN104034468B CN 104034468 B CN104034468 B CN 104034468B CN 201410165831 A CN201410165831 A CN 201410165831A CN 104034468 B CN104034468 B CN 104034468B
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Abstract
The invention discloses a kind of explosive water shooting near field shock wave pressure measuring method, thin-film strain gauge adopts Wear Characteristics of Epoxy Adhesive to be attached on cotton by this measuring method, thin-film strain gauge welds with coaxial cable, the other end of coaxial cable is connected with charge amplifier, charge amplifier connection signal line, the other end of signal wire is connected with data collecting instrument.The cotton being pasted with thin-film strain gauge is loaded onto test bracket, sample is fixed on apart from the position of thin-film strain gauge certain distance by cotton thread and enameled wire, detonator is connected on sample, by test bracket submerged, the technical parameter of setting data Acquisition Instrument, detonate sample, measures sample underwater blast near field output pressure.The present invention can test at Miniature pool, and process of the test is simple, and test figure, for directly to record, does not need to carry out secondary derivation.Test component is simple and easy to processing, and cost is lower.The present invention can carry out hectogram magnitude sample, the measurement of Underwater Near shock wave pressure.
Description
Technical field
The invention belongs to explosive wastewater technical field, be specifically related to a kind of explosive water shooting near field shock wave pressure measuring method, adopt the method can measure explosive water shooting near field shock wave pressure.
Background technology
It is high that blast near field shock wave pressure has surge pressure, pressure increase frequency is fast, the features such as the expansion of pressure wave front is rapid, large and the high-pressure shocking wave of blast rarefaction wave shock wave pressure influence is to effects such as the adiabatic compression of water, make the loss of near field shock wave energy huge, near field shock wave pressure is caused to decline quickly, the non-constant width of shock wave pressure scope, therefore in measuring technique to the response frequency of thin-film strain gauge, range, the recording rate of sensitivity and data acquisition recorder has very high requirement, simultaneously owing to having the expansion of detonation product and reflecting the effect of rarefaction wave, the measurement of shock wave near field stress brings very large interference.Mainly utilize light side method, electrical measuring method and photoelectricity combined techniques at present, and in conjunction with numerical evaluation, near field shock wave characteristics is studied.In early days, due to the restriction of thin-film strain gauge range, comparatively difficult to the measurement of near field shock wave parameter.Then, people start to utilize schlieren camera, framing camera and scanning camera to study the shock wave of water shooting, the research of near field shock wave characteristics is had very large leap.
Mainly there are the following problems for above-mentioned explosive water shooting near field shock wave pressure measuring method:
(1) instrument and equipment needed for experimentation cost is expensive, and experimentation cost is higher, is unfavorable in underwater explosion charge formula Design preliminary process, repeatedly adjusts the factor such as recipe ingredient and technique, carries out the measurement of a large amount of underwater blast near fields shock wave pressure.
(2) pressure recorded is the pressure calculated according to the impact Hugoniot equation of underwater shock wave speed and water, the link of test figure is more, measuring accuracy is difficult to ensure, especially for non-ideal system explosive, the starting stage of detonation, the bubble that explosion product is formed outwards expands together with shock wave, is difficult to obtain underwater shock wave propagation trajectories more clearly.
(3) along with underwater explosion charge development, the critical dimension of a lot of underwater explosive is comparatively large at present, because dose increases, adopts above-mentioned optical measuring technique, can not meet the requirement of process of the test to test dose.
Summary of the invention
In order to solve shortcomings and deficiencies of the prior art, the invention provides a kind of explosive water shooting near field shock wave pressure measuring method, the method makes explosive underwater blast wave pressure parameter quantize, and improves formulation designs and application level.
To achieve these goals, explosive water shooting near field provided by the invention shock wave pressure measuring method, specifically follow these steps to carry out: step 1: installation test support, described test bracket is made up of 2 curb girders, 2 crossbeams, pressing plate and nuts, crossbeam and curb girder isometric, length is at least greater than 0.5m, and there is the circular hole for installing crossbeam curb girder upper and lower position, middle part has for the pilot hole of fixed sample and the mounting hole for installing pressing plate, installs pressing plate by bolt; There is installation screw thread at crossbeam two ends; Screw thread is had at crossbeam two ends, and the corresponding mounting hole through curb girder, be fixed on curb girder by nut;
Step 2: the terminals of thin-film strain gauge are welded with coaxial cable terminals;
Step 3: cloth cotton tatting twill being cut into wide 1cm ~ 2cm, long 1.5m ~ 2m, pastes on cloth center by thin-film strain gauge;
Step 4: cotton tatting twill cloth is fixed on test bracket by pressing plate;
Step 5: sample cotton thread is suspended on the crossbeam center above test bracket, make powder column axis coaxial with thin-film strain gauge sensitive area, sample lower surface is parallel with cloth plane, and sample is controlled at the enameled wire of sample both sides by cotton thread and tying up;
Step 6: detonator is inserted in the detonator hole of sample upper surface also fixing, sample mount is put into water, detonator is connected with detonating cord;
Step 7: coaxial cable output terminal is connected on this thin-film strain gauge dedicated charge converter, is connected on data acquisition unit by data cable;
Step 8: turn-on data acquisition instrument, arranges test parameters;
Step 9: detonate sample, obtains shock wave time pressure curve by data acquisition instrument.
This method curb girder can be channel-section steel, and crossbeam can be reinforcing bar.Terminals and the coaxial cable soldering terminals time of described thin-film strain gauge are preferably 3-5 second, solder joint waterproof gasket cement sealing, and are wound around waterproof insulation tape.The power of 1N can be applied the thin-film strain gauge on cotton tatting twill cloth center, place 12 hours, ensure reliably reliable.Thin-film strain gauge can choose the PVF2-11-.125.EK type thin-film strain gauge of DYNASEN company of the U.S..
Beneficial effect of the present invention is embodied in the following aspects: 1) the present invention can test at Miniature pool, and process of the test is simple, and test figure, for directly to record, does not need to carry out secondary derivation.2) method test component is simple, and easily process, cost is lower.3) the present invention can carry out hectogram magnitude sample, the measurement of Underwater Near shock wave pressure.
Accompanying drawing explanation
Fig. 1 is test system architecture figure, in Fig. 1, and 1 curb girder, 2 pressing plates, 3 enameled wires, 4 samples, 5 cotton threads, 6 crossbeams, 7 data cable, 8 data acquisition instruments, 9 charge converter, 10 coaxial cables, 11 thin-film strain gauges, 12 cotton tatting twill cloths.
Fig. 2 typical explosive water shooting near field shock wave pressure experiment curv.
Embodiment
The present invention is described in further detail for the embodiment provided below in conjunction with accompanying drawing and inventor.
See Fig. 1, explosive water shooting near field of the present invention shock wave pressure measuring method, Wear Characteristics of Epoxy Adhesive is adopted by thin-film strain gauge 11 to be attached on cotton tatting twill 12, the terminals of thin-film strain gauge 11 weld with SYV-50-3-1 type coaxial cable 10 one end, and carry out water-proofing treatment, SYV-50-3-1 type coaxial cable 10 other end is connected with the input end of charge amplifier 10, the output terminal of charge amplifier 10 is connected with one end of signal wire 7, and the other end of signal wire 7 is connected with data collecting instrument.The cotton tatting twill 12 being pasted with thin-film strain gauge 11 is arranged on by pressing plate 2 on the test bracket be made up of curb girder 1 and crossbeam 6, sample 4 is fixed on apart from the position of thin-film strain gauge 11 certain distance by cotton thread 5 and enameled wire 3, detonator is connected on sample 4, by test bracket submerged, the technical parameter of setting data Acquisition Instrument 8, detonate sample, measures sample underwater blast near field output pressure.
During concrete test, follow these steps to operate:
The terminals of thin-film strain gauge 11 200 orders or following trade mark sand paper are polished, removes oxide layer.SYV-50-3-1 type coaxial cable 10 is welded with thin-film strain gauge 11 terminals, and solder joint waterproof gasket cement is carried out sealing, and be wound around waterproof insulation tape, make it meet the requirement of waterproof and insulation.Cotton tatting twill 12 is cut into wide 2cm, the cloth of long 2m.With 701 or 502 glue, thin-film strain gauge 11 is pasted onto the center of cotton strap.And the power of 1N that paste position is exerted pressure, place 12 hours.
By corresponding with the mounting hole on test bracket curb girder 1 for mounting hole on pressing plate 2, by bolt, nut, two pressing plates 2 are separately fixed on two curb girders 11.
Respectively there is the screw thread of the long M20 of 10cm at two crossbeam 6 two ends, first respectively tighten the nut of a M20 at crossbeam 6 two ends, and then the corresponding mounting hole through curb girder 1, is fixed on curb girder 1 by nut.Lower and upper cross-member is all according to said method installed, and mounted test bracket requires in suspention process, does not deform.
The stainless steel compressing tablet that the cotton tatting twill cloth 12 pasting thin-film strain gauge 11 is coordinated by bolt and pressing plate 2 is fixed on pressing plate 2, makes that cotton tatting twill cloth 12 is exceptionally straight to be fixed on test bracket.
Be suspended on crossbeam 6 center above test bracket by by the inelastic cotton thread 5 of sample 4, ensure that powder column axis is coaxial with thin-film strain gauge 11 sensitive area, sample 4 lower surface is parallel with cotton tatting twill cloth 12 plane.The distance of sample 4 lower surface and thin-film strain gauge 11 is determined according to testing requirements, is generally 5cm ~ 40cm adjustable.Sample space position is by hanging the cotton thread 5 of sample 4, and the enameled wire 3 tied up in sample both sides, three directions apply pulling force and regulate length to control, enameled wire 3 one end is tied up on sample 4, the other end is tied up on the pilot hole that curb girder 1 is reserved, guarantee that sample 4 position is fixed, can not occur to swing or float in water.The test bracket assembling thin-film strain gauge 11 and sample 4 is positioned under water, makes the upper surface of the sample 4 distance water surface be not less than 30cm.
The output terminal of SYV-50-3-1 type coaxial cable 10 is connected to the input end of in charge converter 9 by BNC connector, charge converter 9 output terminal to be connected on data acquisition unit 8 by 50 ohm coaxial signal wires 7.
Turn-on data acquisition instrument 8, arranges the test parameterss such as sample frequency, sampling length, triggering mode.
Vertically mention sample mount, sample 4 end face is surfaced, and inserted slowly by detonator in the detonator hole of sample 4 upper surface, detonator fixed by blend compounds cloth.Require in this process that detonator is in short circuit state.Then test bracket vertically puts into the water Central Plains degree of depth, is connected by detonator with detonating cord.Detonate sample 4, obtains shock wave time pressure curve by data acquisition instrument 8.
Embodiment 1:
The present embodiment is that B explosive underwater blast near field stress is measured, and B explosive 25g adopts founding shaping, size of powder charge φ 25mm × 30mm, point position distance explosive end face 9cm.Using Blast pond, diameter 3.2 meters, is the pond of 2.4 meters deeply, and its test method comprises the following steps;
The terminals of thin-film strain gauge 200 order sand paper are polished, are removed oxide layer by step one: the PVF2-11-.125.EK type thin-film strain gauge selecting DYNASEN company of the U.S..SYV-50-3-1 type coaxial cable is welded with thin-film strain gauge terminals, ensure that solder joint must smoothly weld, be strictly on guard against rosin joint, scolding tin is unsuitable, and too much weld interval should be not long, general 3-5 second, and the danger do not fractureed, and solder joint waterproof gasket cement is carried out sealing, and be wound around waterproof insulation tape, make it meet the requirement of waterproof and insulation.
Step 2: cotton tatting twill is cut into wide 2cm, the cloth of long 2m.Use high-performance epoxy (H-610) glue, this glue is divided into A and B two groups, by specification proportioning.One deck primer is stamped in the direction of being reserved on cotton tatting twill by the glue prepared in advance with glue rod (join glue use) and position book book, then in the substrate (which face attention distinguishes is substrate) of thin-film strain gauge, smear one deck of book book, then thin-film strain gauge is pasted on predetermined cotton center.
Step 3: test bracket curb girder adopts 50 channel-section steels, mounting hole on pressing plate is corresponding with the mounting hole on test bracket curb girder, by bolt, nut, two pressing plates are separately fixed on two curb girders.
Step 4: test bracket crossbeam adopts No. 20 IV level hot-rolled reinforced bars, respectively there is the screw thread of the long M20 of 10cm at two crossbeam two ends, the nut with M20 is first respectively tightened at crossbeam two ends, then the corresponding mounting hole through curb girder, be fixed on curb girder by nut, warranty test support Stability Analysis of Structures when having hanged state.
Step 5: will paste the cotton tatting twill cloth of thin-film strain gauge by bolt and pressing plate, is exceptionally straightly fixed on test bracket.
Step 6: be suspended on crossbeam center above test bracket by by the inelastic cotton thread of sample, ensure that powder column axis is coaxial with thin-film strain gauge sensitive area, sample lower surface is parallel with cotton plane.The distance 9cm of sample lower surface and thin-film strain gauge.The enameled wire in sample both sides by hanging the cotton thread of sample, and is tied up in sample space position, and three directions apply pulling force and regulate length to control.Guarantee that sample position is fixed, can not occur to swing or float in water.
Step 7: inserted by detonator in the detonator hole of sample upper surface slowly, detonator fixed by blend compounds cloth, require in this process that detonator is in short circuit state, then sample mount vertically puts into water, makes the upper surface distance water surface 30cm of sample.
Step 8: be connected to by SYV-50-3-1 type coaxial cable output terminal on this thin-film strain gauge dedicated charge converter and (purchase with thin-film strain gauge is supporting), charge converter is connected on U.S. HBM company HBM5ei type data acquisition unit.
Step 9: turn-on data acquisition instrument, arranges the test parameterss such as sample frequency, sampling length, triggering mode.
Step 10: be connected with detonating cord by detonator, detonate sample, obtains shock wave time pressure curve by data acquisition instrument.
Test findings is in table 1.
Table 1B Explosive Shock Wave test findings
Embodiment 2:
Process of the test is undertaken by embodiment 1.
This test, the repeatability of JH-14 explosive to the method measurement result is adopted to verify, often sending out test dose is 10g, size of powder charge is ф 15mm × 15mm, and sample lower surface is 11cm apart from the sensitive area of PVDF, and the test bracket assembling sample is put into pond, sample underwater penetration is made to be 30cm, carried out 7 tests altogether, obtained that the results are shown in Table 2, the testing standard difference obtained is 8.2%.
Table 2JH-14 explosive near field shock wave pressure
Claims (5)
1. an explosive water shooting near field shock wave pressure measuring method, is characterized in that step is as follows:
Step 1: installation test support, described test bracket is made up of 2 curb girders (1), 2 crossbeams (6), pressing plate (2) and nuts, crossbeam and curb girder isometric, length is at least greater than 0.5m, there is the circular hole for installing crossbeam curb girder (1) upper and lower position, middle part has for the pilot hole of fixed sample and the mounting hole for installing pressing plate, installs pressing plate (2) by bolt; There is installation screw thread at crossbeam (6) two ends; Screw thread is had at crossbeam (6) two ends, and the corresponding mounting hole through curb girder (1), be fixed on curb girder (1) by nut;
Step 2: the terminals of thin-film strain gauge (11) are welded with coaxial cable (10) terminals;
Step 3: the cloth (12) cotton tatting twill being cut into wide 1cm ~ 2cm, long 1.5m ~ 2m, pastes on cloth center by thin-film strain gauge;
Step 4: cotton tatting twill cloth (12) is fixed on test bracket by pressing plate (2);
Step 5: sample (4) cotton thread (5) is suspended on crossbeam center above test bracket, make powder column axis coaxial with thin-film strain gauge (11) sensitive area, sample (4) lower surface is parallel with cloth (12) plane, and sample (4) is controlled at the enameled wire (3) of sample both sides by cotton thread (5) and tying up;
Step 6: detonator is inserted in the detonator hole of sample (4) upper surface also fixing, test bracket is put into water, detonator is connected with detonating cord;
Step 7: coaxial cable output terminal is connected on this thin-film strain gauge dedicated charge converter (9), is connected on data acquisition unit (8) by data cable (7);
Step 8: turn-on data collector (8), arranges test parameters;
Step 9: detonate sample, obtains shock wave time pressure curve by data acquisition instrument.
2. the method for claim 1, is characterized in that: described curb girder (1) is channel-section steel, and crossbeam (6) is reinforcing bar.
3. the method for claim 1, is characterized in that: the terminals of described thin-film strain gauge (11) and coaxial cable (10) soldering terminals time are 3-5 second, solder joint waterproof gasket cement sealing, and are wound around waterproof insulation tape.
4. the method for claim 1, is characterized in that: the power thin-film strain gauge (11) on cotton tatting twill cloth (12) center being applied to 1N, places 12 hours.
5. the method as described in claim as arbitrary in Claims 1 to 4, is characterized in that, thin-film strain gauge (11) chooses the PVF2-11-.125.EK type thin-film strain gauge of DYNASEN company of the U.S..
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Patent Citations (4)
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| US4379401A (en) * | 1981-08-28 | 1983-04-12 | The United States Of America As Represented By The Secretary Of The Army | System for measuring plate deformation produced by explosive shock waves, and motion-sensing accelerometer transducer used therein |
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