CN103954444B - A kind of test method of firer's separation nut release reliability - Google Patents
A kind of test method of firer's separation nut release reliability Download PDFInfo
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Abstract
A kind of test method of firer's separation nut release reliability, based on the principle of work of firer's separation nut " action of igniter blast combustion gas acting pushing executing mechanism ", to the Specifeca tion speeification of reflection firer separation nut reliability, namely lighter gaseous-pressure and topworks's resistance are tested, and utilize test data to evaluate and test firer's separation nut reliability.Compared with traditional pyrotechnical devices Success-failure Type reliability test method, the testpieces negligible amounts required for the inventive method, experimentation cost are low, have more engineering exploitativeness.By the inventive method, firer's separation nut release reliability is tested, be convenient to the weak link grasping firer separation nut release reliability, increase for firer's separation nut improves to obtain product reliability foundation is provided.
Description
Technical field
The present invention relates to a kind of method of testing of firer's separation nut performance.
Background technology
At present, often on spacecraft adopt that pyrotechnical devices realizes between spacecraft and delivery, between spacecraft module section, spacecraft annex (as antenna, solar wing etc.) is separated with the connection between spacecraft body or compresses release.Although pyrotechnical devices in the whole life cycle of spacecraft only action once, often relate to the success or failure of spacecraft flight task.Therefore, in aerospace engineering, to the reliability of pyrotechnical devices, there is very high requirement usually.
For guaranteeing spacecraft flight Mission Success, the reliability of pyrotechnical devices being carried out fully, effective ground validation is very important.People's Republic of China's GJB " priming system reliability estimation method GJB376-87 " gives priming system reliability general evaluating method, namely based on Success-failure Type test, evaluates and tests the fiduciary level of priming system with binomial distribution or hypergeometric distribution.This Success-failure Type test, required testpieces quantity is all very huge with test funds, makes the reliability compliance test of pyrotechnical devices be difficult to carry out.Such as, for verifying the reliability index (assessing by degree of confidence γ=0.9) of certain pyrotechnical devices 0.9999,23025 pyrotechnical devices Firing test parts are needed when failure number is 0.How in limited test funds and the fail-test checking effectively carrying out pyrotechnical devices in the test period, it is the technical barrier needing in Practical Project to solve.
In 30th volume the 6th phase Acta Astronauticas in 2009, " the strenuous test verification method of Space Pyrotechnics Devices mechanism reliability " one delivered by Rong Jili etc. is civilian, for a class Space Pyrotechnics Devices mechanism of performance parameter Normal Distribution, with reference to " stress-intensity " model, propose a kind of System in Small Sample Situation reliability verification method of strenuous test.Pyrotechnical devices performance parameter is placed in relative under condition harsher rated condition by the method, evaluates and tests its reliability by traditional Success-failure Type test method, then derives the reliability under rated condition in conjunction with the mechanical characteristic of pyrotechnical devices.This method application normal distribution variation coefficient and add tight coefficient to evaluate the reliability of pyrotechnical devices, required testpieces quantity depends on variation coefficient and adds the concrete numerical value of tight coefficient, and reliability evaluating result is closely related with the precision adding tight coefficient with variation coefficient.According to the method, before the fail-test of carrying out pyrotechnical devices, first should determine variation coefficient and add tight coefficient, and the determination of variation coefficient often needs based on the test figure of some.Therefore, in practical engineering application, the method is for reduction testpieces quantity, reduction testing expenses limited use.In addition, the method using pyrotechnical devices resistance as known definite value.And according to engineering experience, the resistance of pyrotechnical devices often has the characteristic of normal distribution.Therefore, pyrotechnical devices resistance is considered as definite value and will affects the precision of reliability evaluating.
Summary of the invention
The technical matters that the present invention solves is: have when carrying out reliability testing for the test of existing employing Success-failure Type to pyrotechnical devices that testpieces quantity is many, test funds are high, the problem that measuring accuracy is low, provide a kind of test method of firer's separation nut release reliability of feature based gauge amount, can while raising measuring accuracy, significant reduction testpieces quantity and testing expenses, reduce experimentation cost.
Technical solution of the present invention is: a kind of test method of firer's separation nut release reliability, comprises the steps:
(1) the lighter gaseous-pressure of firer's separation nut and topworks's resistance two parameters are defined as firer's separation nut release characteristic quantities;
(2) lighter is arranged on firer's separation nut cavity volume simulating piece, and the position setting pressure sensor of topworks's gaseous-pressure truly can reflect the action of firer's separation nut on firer's separation nut cavity volume simulating piece before; Described firer's separation nut cavity volume simulating piece is a reusable device with inner volume, and the profile of described inner volume and volume are all identical with the actual cavity volume of tested firer's separation nut;
(3) use m group lighter to get angry m time altogether, often the lighter quantity that uses of group is consistent with the lighter quantity of firer's separation nut actual installation, gathers and records the pyrophoric gas pressure x of each pressure transducer acquisition
i, i=1,2,3......, m;
(4) to m pyrophoric gas pressure x
icarry out normal distribution-test, if meet normal distribution, then calculate the average of m data
with standard deviation s
x, and enter next step; If do not meet normal distribution, terminate;
(5) firer's separation nut testpieces of the individual not mounting points firearm of l is chosen, adopt charger to carry out pneumatic unblock test l time altogether from the installation site of lighter to the inner chamber inflation of firer's separation nut testpieces, record the maximum resistance y of atmospheric pressure value as topworks of the topworks's action moment charger in each firer's separation nut
j, j=1,2,3......, l;
(6) to the maximum resistance y of l topworks
jcarry out normal distribution-test, if meet normal distribution, then calculate the average of l data
with standard deviation s
y, and enter next step; If do not meet normal distribution, terminate;
(7) utilize the result of step (5) and step (6), pass through formula
calculate the reliability R of firer's separation nut, wherein
(8) the reliability R of firer's separation nut step (7) calculated and required reliability standard R
bcompare, if R>=R
b, then judge that the reliability of firer's separation nut meets the demands; If R<R
b, then improvement carried out to the structure of firer's separation nut and again perform step (2) ~ (7), until the reliability of firer's separation nut meets the demands.
Described improves to the structure of firer's separation nut the explosive load comprising and increase firer's separation nut, increases the gaseous-pressure active area of firer's separation nut topworks, or reduces the friction factor of topworks's rubbing surface.
The present invention's advantage is compared with prior art:
1) the lighter gaseous-pressure of firer's separation nut and topworks's resistance are defined as firer's separation nut release characteristic quantities by the inventive method, by repeatedly testing characteristic quantity, its test result truly can reflect the performance of firer's separation nut, on this basis the reliability of firer's separation nut is judged, be convenient to the weak link grasping hot work nut reliability, increase for hot work nut improves to obtain product reliability foundation is provided;
2) the present invention is based on the reliability demonstration thinking of measurement Law, the lighter gaseous-pressure of firer's separation nut and topworks's resistance performance test data is utilized to evaluate and test firer's separation nut release reliability, compared with testing with Success-failure Type, can effective less test sample quantity, reduce testing expenses, shorten the test period;
3) the present invention is by firer's separation nut cavity volume simulation frock to the test of lighter gaseous-pressure, can not use actual firer's separation nut, therefore can effectively reduce experimentation cost in test process;
4) the inventive method is tested topworks's resistance by pneumatic unblock test firer's separation nut, can reuse, thus reduce further the cost of test after test to firer's separation nut after recovering.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is lighter gaseous-pressure test philosophy figure in the inventive method;
Fig. 3 is topworks's resistance measurement schematic diagram in the inventive method.
Embodiment
Firer's separation nut is a kind of pyrotechnical devices that spacecraft extensively adopts, mainly comprise lighter and topworks, its principle of work is: during the release of firer's separation nut, igniter blast produces high-pressure gas, under the promotion of high-pressure gas, the inner topworks's action of firer's separation nut also completes the release of coupling bolt, thus realizes the release function of firer's separation nut.The inventive method is mainly for this firer's separation nut based on " action of igniter blast combustion gas acting pushing executing mechanism " principle of work.
As shown in Figure 1, be the process flow diagram of the inventive method, concrete implementation step is as follows:
1) according to the principle of work of firer's separation nut, first set firer's separation nut release reliability, make it consistent with " lighter gaseous-pressure is greater than the probability of topworks's resistance ".
2) the evaluation and test characteristic quantity of firer's separation nut release reliability is determined.According to the principle of work of firer's separation nut, determination lighter gaseous-pressure of the present invention and topworks's resistance are the characteristic quantity of firer's separation nut release reliability evaluating.At this, note lighter gaseous-pressure X, topworks resistance Y.
3) firer's separation nut lighter gaseous-pressure test data collection.Adopt cavity volume simulation frock before the action of firer separation nut (can cavity volume profile before the action of accurate simulation firer separation nut and cavity volume volume, and simulation frock cavity should have enough intensity and meet reusable requirement after cleaning.Usually can select the steel being easy to process, make according to the cavity volume volume of actual lots firer separation nut and intensity index) carry out igniter blast test.First, lighter is arranged on before action in cavity volume simulation frock, and position (the topworks's piston end surface as gaseous-pressure effect) the setting pressure sensor of topworks's gaseous-pressure before cavity volume simulation frock truly can reflecting the action of firer's separation nut before action; Then, by igniter blast, gather and record pyrophoric gas pressure, as shown in Figure 2.Get angry m time altogether, remember in m the gaseous-pressure test of firer's separation nut lighter, obtain m gaseous-pressure test data x
i(i=1,2 ..., m).
4) firer's separation nut topworks resistance measurement.Not mounting points firearm, and according to actual maneuvering load, firer's separation nut is loaded, charger is adopted to carry out pneumatic unblock test by lighter installation site to the inner chamber inflation of firer's separation nut, the atmospheric pressure value of record topworks action moment charger, the maximum resistance of this atmospheric pressure value and topworks, as shown in Figure 3.Remember in l the pneumatic unblock test of firer's separation nut, obtain l pneumatic unblock topworks maximum resistance test data y
j(j=1,2 ..., l).
5) firer's separation nut release reliability evaluating.Normal distribution-test is carried out to lighter gaseous-pressure and topworks's resistance measurement data, and based on " stress-intensity " interference theory, evaluate and test firer's separation nut release reliability, detailed process is as follows:
1. according to m the gaseous-pressure test data x that experimental test obtains
i(i=1,2 ..., m) with l firer's separation nut topworks resistance measurement data y
j(j=1,2 ..., l), according to the method for standard GB/T/T4882, test of normality is carried out to measured data, and the sample average of gaseous-pressure X and topworks resistance Y can be calculated
standard deviation s
x, s
ybe respectively
If 2. through inspection, gaseous-pressure X, topworks resistance Y all do not refuse normal assumption, then make:
3. Calculation of Reliability:
Firer's separation nut release reliability R calculates by following formula and obtains
According to t
r, look into standard " normal distribution of GB4086.1-1983 statistical distribution numerical tabular " and Φ (t can be obtained
r) value, i.e. firer's separation nut release reliability assessment value.
6) if firer's separation nut release reliability assessment result meets index request, then firer's separation nut release reliability compliance test terminates, otherwise analyze reason, carry out Curve guide impeller to firer's separation nut, innovative approach mainly comprises the following aspects:
1. firer's separation nut explosive load is increased;
2. firer's separation nut topworks gaseous-pressure acting surface area is increased;
3. topworks's rubbing surface friction factor is reduced.
After improving, according to 3) ~ 5) verification experimental verification is again carried out to firer's separation nut release reliability.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.
Claims (1)
1. a test method for firer's separation nut release reliability, is characterized in that comprising the steps:
(1) the lighter gaseous-pressure of firer's separation nut and topworks's resistance two parameters are defined as firer's separation nut release characteristic quantities;
(2) lighter is arranged on firer's separation nut cavity volume simulating piece, and the position setting pressure sensor of topworks's gaseous-pressure truly can reflect the action of firer's separation nut on firer's separation nut cavity volume simulating piece before; Described firer's separation nut cavity volume simulating piece is a reusable device with inner volume, and the profile of described inner volume and volume are all identical with the actual cavity volume of tested firer's separation nut;
(3) use m group lighter to get angry m time altogether, often the lighter quantity that uses of group is consistent with the lighter quantity of firer's separation nut actual installation, gathers and records the pyrophoric gas pressure x of each pressure transducer acquisition
i, i=1,2,3......, m;
(4) to m pyrophoric gas pressure x
icarry out normal distribution-test, if meet normal distribution, then calculate the average of m data
with standard deviation s
x, and enter next step; If do not meet normal distribution, terminate;
(5) firer's separation nut testpieces of the individual not mounting points firearm of l is chosen, adopt charger to carry out pneumatic unblock test l time altogether from the installation site of lighter to the inner chamber inflation of firer's separation nut testpieces, record the maximum resistance y of atmospheric pressure value as topworks of the topworks's action moment charger in each firer's separation nut
j, j=1,2,3......, l;
(6) to the maximum resistance y of l topworks
jcarry out normal distribution-test, if meet normal distribution, then calculate the average of l data
with standard deviation s
y, and enter next step; If do not meet normal distribution, terminate;
(7) utilize the result of step (5) and step (6), pass through formula
calculate the reliability R of firer's separation nut, wherein
(8) the reliability R of firer's separation nut step (7) calculated and required reliability standard R
bcompare, if R>=R
b, then judge that the reliability of firer's separation nut meets the demands; If R<R
b, then improvement carried out to the structure of firer's separation nut and again perform step (2) ~ (7), until the reliability of firer's separation nut meets the demands; Described improves to the structure of firer's separation nut the explosive load comprising and increase firer's separation nut, increases the gaseous-pressure active area of firer's separation nut topworks, or reduces the friction factor of topworks's rubbing surface.
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| CN105760613A (en) * | 2016-03-01 | 2016-07-13 | 北京空间飞行器总体设计部 | Load prediction method for pyrotechnic impact source of spacecraft |
| CN106404440A (en) * | 2016-09-22 | 2017-02-15 | 北京空间飞行器总体设计部 | Separation reliability evaluation method for liquid path disconnector separating device of spacecraft |
| CN110174248A (en) * | 2019-01-29 | 2019-08-27 | 北京机电工程研究所 | Big magnitude isolation damper damping capacity verification method and the test tool for it |
| CN111027188B (en) * | 2019-11-27 | 2023-03-24 | 西安航天动力研究所 | Sample method for verifying reliability index of gunpowder gas actuating valve |
| CN111946722A (en) * | 2020-07-31 | 2020-11-17 | 北京凌空天行科技有限责任公司 | Pneumatic separation nut device |
| CN114593765B (en) * | 2022-05-09 | 2022-07-26 | 天津航天机电设备研究所 | Automatic pneumatic separation test bed for aerospace separation nut assembly |
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