CN104655343A - High-precision measuring method for dynamic pushing force of micro initiating explosive actuated device - Google Patents
High-precision measuring method for dynamic pushing force of micro initiating explosive actuated device Download PDFInfo
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- CN104655343A CN104655343A CN201510067138.8A CN201510067138A CN104655343A CN 104655343 A CN104655343 A CN 104655343A CN 201510067138 A CN201510067138 A CN 201510067138A CN 104655343 A CN104655343 A CN 104655343A
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Abstract
The invention discloses a high-precision measuring method for the dynamic pushing force of a micro initiating explosive actuated device. The high-precision measuring method is based on the strain measuring principle of a strain transducer of a cantilever beam type; through static calibration of the stress-strain curve of a cantilever beam on an elastic deformation stage, the corresponding relation between the stress of the cantilever beam and the strain capacity of the strain transducer can be obtained, a cantilever beam is designed for mounting and fixing of the strain transducer, and a proper data acquisition system is adopted, so that the strain transducer can precisely measure the dynamic pushing force-stroke relation of the micro initiating explosive actuated device; compared with the conventional pushing force measuring methods, such as a method for upwards pushing a weight or a method utilizing a pressure sensor, the high-precision measuring method provided by the invention has the advantages that the full-stroke pushing force-time variation relation can be obtained through one-time measuring of the pushing force, the interference effect on the pushing force of a sample to be measured is weak, and the measuring precision is high. According to the measuring principle, the high-precision measuring method can also be utilized for measuring the pushing force of each moving part of initiating explosive actuated devices which have various sizes and various degrees of the pushing force.
Description
Art
The present invention relates to a kind of method of testing of firer's acting device thrust output, particularly miniature firer's acting device Dynamic High-accuracy pushes away the method for testing of force-time relationship, belongs to fire-working article test technical field.
Background technology
The arming process in fuzes mechanism of miniature firer's acting device and semi-girder composition is widely used in MEMS (micro electro mechanical system) (MEMS), and the relation of its method for designing is that the semi-girder of corresponding certain bending strength-travel relationships is to select the parameters such as firer's actuator thrust, stroke and cantilever material, size, displacement.Wherein thrust-time parameter the design of firer's actuator is gordian technique.The method of traditional measurement firer acting device thrust performance has two kinds: promote weight method and pressure transducer method.Promote weight method and above the piston of firer's acting device, namely load the load of constant weight as counterweight, how high how heavy weight load boost by test piston, constantly changes the weight of counterweight, to determine the acting limit of power of firer's acting device in test.The method test error is large, affect greatly by counterweight weight size, and the piston in firer's acting device will be separated from each other in a flash in promotion load, cannot record dynamic thrust-travel relationships, poor to the directiveness of firer's acting device explosive load design and Izod strength design.And pressure transducer method is placing a pressure transducer in distance piston end a distance, when piston movement is to time herein, to strike on pressure transducer and to be recorded thrust size, determining the thrust of firer's acting device with this.Sensor in the method is fixed, do not move along with the motion of piston, firer's acting device can only be obtained and push away force-time relationship in fixed journey system position, and produce certain impact shock because of the athletic meeting of piston, test result is had a certain impact.Obviously these conventional test methodologies all can not meet the test request to miniature firer's acting device thrust output-time relationship.And the domestic standards and norms still lacking the thrust method of testing of firer's acting device at present, are also badly in need of the technical manual that formulation one can realize standardization measurement.
Shandong in 1996 is built and the people such as to be deposited in " count and check of piston actuator output parameter ", once adopted the thrust output-time curve of pressure transducer to piston actuator to test.Find out from the test result of 9 tests, the thrust output peak value of this piston actuator is between 598 ~ 755N, but the method is also test based on traditional pressure transducer method, need fixation of sensor motionless in experiment, and the piston of firer's acting device strikes on sensor by the promotion accelerated motion of powder gases, this method has obvious drawback, when sensor is when being subject to the effect of piston impact load, produce very large dynamic stress and dynamic deformation, within the extremely short time, also great change can be there is in the speed of piston, the thrust recorded not is the piston thrust under real gunpowder effect.National University of Defense technology Wu Wen in 2003 is outstanding adopts piezoelectric force transducer and acceleration transducer in " priming system be used as power dynamic test system design and implimentation ", special counterweight car has carried out direct test to the thrust that piston actuator produces, and its test macro mainly comprises thrust pickup, testboard bay, data acquisition system (DAS) etc.But the counterweight load in this system can't represent practical situations, counterweight is different, and the thrust recorded is also different, and the size of counterweight car and thrust magnitude are not suitable for the measurement pushing away force-time relationship of miniature firer's acting device.
Can say, be only from qualitative or semiquantitative angle to judge the acting performance of firer's acting device for existing thrust method of testing, and that still can not carry out total travel to firer's acting device pushes away force-time relationship Performance Evaluation.Want the technical requirement reaching modern MEMS (micro electro mechanical system), continue simply to adopt the prior art in document or combination to be difficult to realize, also need to explore new test philosophy and could solve above-mentioned technical barrier.
Summary of the invention
In order to overcome the deficiency existed in above-mentioned method of testing, improve the measuring accuracy that miniature firer's acting device exports power, the present invention proposes the method for testing based on beam type strain transducer, by the stress-strain curve of static demarcating semi-girder elastic deformation stage, obtain the corresponding relation of cantilever beam stress and strain transducer strain amount, to strain transducer be posted again and the known semi-girder of strain-stress relation as thrust dynamic measurement sensor, accurately can measure miniature firer's acting device and push away force-time relationship dynamically.
The technical solution adopted for the present invention to solve the technical problems is:
Based on the strain testing principle of beam type strain transducer, by the stress-strain curve of static demarcating semi-girder elastic deformation stage, obtain the corresponding relation of cantilever beam stress and strain transducer strain amount, during piston setting in motion in firer's acting device, promotion semi-girder bends, strain transducer is responded to the strain-time-varying signal of the semi-girder amount of bending and is changed by signal conditioner and be transferred to data acquisition system (DAS) after amplifying signal, calculate the miniature firer's acting device of acquisition by the stress-strain curve obtained again and push away force-time relationship dynamically.
According to measuring principle of the present invention, design a thrust performance test macro based on firer's acting device of cantilever beam sensor, its composition mainly comprises tested firer's acting device, firer's acting device stationary fixture, semi-girder, strain transducer, semi-girder stationary fixture, signal conditioner, data acquisition system (DAS), ignition control box and power supply, wherein strain transducer is pasted onto distance a distance, semi-girder top by cementing agent, firer's acting device, firer's acting device stationary installation, semi-girder, semi-girder stationary fixture is bolted together, and semi-girder is close to and concordant with semi-girder top in the top of piston in firer's acting device.When the piston setting in motion of firer's acting device, promote semi-girder and occur bending and deformation, the strain transducer on semi-girder surface starts to gather strain signal and sends data acquisition system (DAS) to.
What select is semi-girder size, semi-girder in material and actual fuse arming process in fuzes mechanism is consistent, thrust output-the time relationship of measured miniature firer's acting device corresponds to and pushes away force-time relationship in practical function process, and measurement result can be directly used in the evaluation of miniature firer's acting device thrust.
At the below of foil gauge and side Uniting mark line, when pasting sensor, ensure that foil gauge is concordant with semi-girder.This installation method of foil gauge can not have influence on the original structure of firer's acting device, size and make dynamic characteristic.
When after the excitation energy that the external world's given low baking temperature work acting device is predetermined, ignition part is lighted a fire, the work done medicament that ignites release high temperature and high pressure gas promotes piston axially-movable, semi-girder occurs bending and deformation under the thrust of piston simultaneously, the strain variation signal that foil gauge induction semi-girder bends stores in real time by being transferred to kinetic analyzer after signal conditioner conversion also amplifying signal, then show that miniature firer's acting device pushes away force-time relationship dynamically by the conversion of stress-strain demarcation relation.
The invention has the beneficial effects as follows: the method pushing away force-time relationship of this kind of kinetic measurement miniature firer acting device does not change the original kinetic characteristic of firer's acting device, what a thrust measurement can obtain total travel pushes away force-time relationship, little to the promotion disturbing effect of sample, measuring accuracy high.The thrust measurement of firer's acting device moving component of various sizes and thrust is also can be applicable to according to principle of the present invention.In the kinetic characteristic method of testing such as thrust, displacement accurately measuring firer's acting device, there is good popularizing application prospect.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the principle of work schematic diagram of beam type strain transducer.In figure, strain transducer is arranged on distance semi-girder stiff end i place, semi-girder length is l, F is the thrust applied at terminal B place to semi-girder, and ω is the displacement that semi-girder produces under the effect of power F, the i.e. stroke of firer's acting device, θ is the angle of bend that semi-girder distortion produces.
Fig. 2 be miniature firer's acting device to the view before and after semi-girder effect, in figure, a is original state, and b is post exercise state.
Fig. 3 is the start characteristic measuring system structural representation of the miniature firer's acting device based on the present invention's design.
Fig. 4 is the exemplary push-time curve of miniature firer's acting device piston.
Embodiment
In FIG, strain transducer is arranged on distance semi-girder stiff end i place, and the thrust F of the piston generation of firer's acting device acts on the B place of semi-girder, thus causes semi-girder to bend, foil gauge inducedstress variable signal ε
i, through signal processor processes and record.Obtaining strain signal ε
iafter, obtain thrust F by formulae discovery below.
In formula: ε
ifor the strain value at i place; W is bending resistant section coefficient, W=bh
2/ 6, h is the height of semi-girder square-section, and b is the wide of square semi-girder square-section; E is the elastic modulus of cantilever material.ε is obtained by strain transducer
icurve over time, just accurately can measure the thrust-time curve of firer's acting device piston element.
Fig. 2 is the state before and after the effect of firer's acting device, and in figure, a is original state, and b is that firer's acting device moves to put in place completely and realizes the state of actuator function.
In Fig. 3, measure firer acting device make dynamic characteristic before, first strain transducer is pasted on a cantilever beam, then connects measuring system circuit according to Fig. 3.According to the specified ignition condition of initiator (1) and the resistance of measuring system circuit, regulate the voltage swing of ignition control box (7), when opening the switch of ignition control box (7), initiator (1) starts to get angry, get angry simultaneously control box (7) fused signal trigger data acquisition system (9) and make its service aisle start to gather each road signal, initiator (1) ignites after getting angry acting medicament (2) produce raw high temperature and high pressure gas and promote the plunger shaft that piston (3) forms along housing (4) inwall and start axially-movable rapidly, the semi-girder (5) contacted with piston (3) also starts to occur bending and deformation, strain transducer (6) starts to gather strain signal and sends signal conditioner (10) to, data acquisition system (DAS) (9) is sent to after amplifying conversion, when piston (3) is in the motion completing predetermined distance, strain transducer (6) has gathered the strain information of semi-girder (5) in this start process, and produce strain-time curve in data acquisition system (DAS) (9), then push away force-time relationship dynamically by the stress-strain curve calculating acquisition firer acting device obtained.In whole movable acting device motion process, the electric current that power supply (8) provides required separately to ignition control box (7), data acquisition system (DAS) (9) and signal conditioner (10).
Fig. 4 is the exemplary push-time curve adopting strain transducer to record, the moment of the fused signal trigger data acquisition system (9) of ignition control box (7) is time of ignition, the moment that piston promotion semi-girder bends is thrust starting point, from igniting, be the t duration of ignition to thrust starting point
f, along with the accelerated motion of piston, thrust is started from scratch change, and accelerates to rise to reach the thrust peak value that maximal value is firer's acting device within the regular hour always, and corresponding abscissa value is t action time of firer's acting device
e.
Claims (3)
1. the Dynamic High-accuracy thrust method of testing of miniature firer's acting device, it is characterized in that: based on the strain testing principle of beam type strain transducer, by the stress-strain curve of static demarcating semi-girder elastic deformation stage, obtain the corresponding relation of cantilever beam stress and strain transducer strain amount, during piston setting in motion in firer's acting device, promotion semi-girder bends, strain transducer is responded to the strain-time-varying signal of the semi-girder amount of bending and is transferred to data acquisition system (DAS) after being amplified by signal conditioner conversion, miniature firer's acting device can be obtained by the stress-strain calibration curve conversion obtained in advance again and push away force-time relationship dynamically.
2. the Dynamic High-accuracy thrust method of testing of miniature firer's acting device according to claim 1, it is characterized in that: semi-girder size, the semi-girder in material and actual fuse arming process in fuzes mechanism selected be consistent, the force-time relationship that pushes away of measured miniature firer's acting device corresponds to and pushes away force-time relationship in practical function process, and measurement result can be directly used in the evaluation of miniature firer's acting device thrust.
3. the Dynamic High-accuracy thrust method of testing of miniature firer's acting device according to claim 1, it is characterized in that: by the external force static demarcating beam type strain transducer strain-stress relation accurately loaded, obtain the corresponding relation of cantilever beam stress and strain transducer strain amount, accurately measure miniature firer's acting device and push away force-time relationship dynamically.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113609579A (en) * | 2021-07-21 | 2021-11-05 | 上海机电工程研究所 | Explosive load identification method and system for initiating explosive actuator |
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| CN101539465A (en) * | 2009-04-24 | 2009-09-23 | 北京航空航天大学 | Propellant pipeline connecting device based on elastic axis |
| CN103674524A (en) * | 2013-11-29 | 2014-03-26 | 北京宇航系统工程研究所 | Testing device connected with push-punching type initiating explosive device |
| CN103837280A (en) * | 2014-03-31 | 2014-06-04 | 常州工学院 | Method and system for measuring contact force of satellite-borne slip ring based on cantilever beam theory |
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2015
- 2015-02-09 CN CN201510067138.8A patent/CN104655343B/en not_active Expired - Fee Related
Patent Citations (5)
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| US4630472A (en) * | 1985-09-03 | 1986-12-23 | Chrysler Motors Corporation | Seat belt testing device |
| CN1290856A (en) * | 2000-11-09 | 2001-04-11 | 常柴股份有限公司 | Measurement of engine mechanical efficiency and back drawing test system |
| CN101539465A (en) * | 2009-04-24 | 2009-09-23 | 北京航空航天大学 | Propellant pipeline connecting device based on elastic axis |
| CN103674524A (en) * | 2013-11-29 | 2014-03-26 | 北京宇航系统工程研究所 | Testing device connected with push-punching type initiating explosive device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113609579A (en) * | 2021-07-21 | 2021-11-05 | 上海机电工程研究所 | Explosive load identification method and system for initiating explosive actuator |
| CN113609579B (en) * | 2021-07-21 | 2024-05-10 | 上海机电工程研究所 | Method and system for identifying explosive load of initiating explosive device |
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