CN103954444A - Method for testing hot work separation nut release reliability - Google Patents
Method for testing hot work separation nut release reliability Download PDFInfo
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- CN103954444A CN103954444A CN201410180588.3A CN201410180588A CN103954444A CN 103954444 A CN103954444 A CN 103954444A CN 201410180588 A CN201410180588 A CN 201410180588A CN 103954444 A CN103954444 A CN 103954444A
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- firer
- separation nut
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Abstract
The invention discloses a method for testing hot work separation nut release reliability. Main performance parameters reflecting the reliability of a hot work separation nut are tested based on the working principle that an igniter performs ignition and burns gas to act to push an executing mechanism to act of the hot work separation nut, wherein the main performance parameters include the gas pressure of the igniter and the resistance of the executing mechanism. The reliability of the hot work separation nut is evaluated based on test data. Compared with a traditional hot work mechanism success or failure type reliability testing method, the number of needed test pieces is small, test cost is low, and higher engineering implementation is achieved. The method is used for testing the hot work separation nut release reliability, so that weak links of the hot work separation nut release reliability are conveniently mastered, and a basis is provided for improving the hot work separation nut to increase the reliability of a product.
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 is realized between spacecraft and delivery, between spacecraft module section, being connected separated or compressing release between spacecraft annex (as antenna, the sun wing etc.) and spacecraft body.Although pyrotechnical devices only moves once in the whole life cycle of spacecraft, often relates to the success or failure of spacecraft flight task.Therefore, in aerospace engineering, the reliability of pyrotechnical devices is had to very high requirement conventionally.
For guaranteeing spacecraft flight Mission Success, to the reliability of pyrotechnical devices carry out fully, effectively ground validation is very important.The GJB < < of People's Republic of China (PRC) priming system reliability estimation method GJB376-87 > > has provided the general evaluating method of priming system reliability, based on Success-failure Type test, with binomial distribution or hypergeometric distribution, evaluate and test the fiduciary level of priming system.This Success-failure Type test, needed testpieces quantity and test funds are all very huge, make the reliability compliance test of pyrotechnical devices be difficult to carry out.For example, for verifying the reliability index (by the assessment of degree of confidence γ=0.9) of certain pyrotechnical devices 0.9999, in the situation that being 0, failure number needs 23025 pyrotechnical devices Firing test parts.How at limited test funds with effectively carry out the fail-test checking of pyrotechnical devices in the test period, be in Practical Project, to need the technical barrier that solves.
On the 30th volume the 6th phase < < aerospace journal > > in 2009, strenuous test verification method > > mono-literary composition of the < < Space Pyrotechnics Devices mechanism reliability of being delivered by Rong Jili etc., Yi Lei Space Pyrotechnics Devices mechanism for performance parameter Normal Distribution, with reference to " stress-intensity " model, a kind of System in Small Sample Situation reliability verification method of strenuous test has been proposed.The method is placed in pyrotechnical devices performance parameter under condition harsher with respect to rated condition, by traditional Success-failure Type test method, evaluates and tests its reliability, then in conjunction with the mechanical characteristic of pyrotechnical devices, derives the reliability under rated condition.This method application normal distribution variation coefficient and add the reliability that tight coefficient is evaluated pyrotechnical devices, needed 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 that adds tight coefficient with variation coefficient.According to the method, before carrying out the fail-test of pyrotechnical devices, should first determine variation coefficient and add tight coefficient, and determining of variation coefficient often needs the test figure of some as basis.Therefore, in practical engineering application, the method for reducing testpieces quantity, to reduce testing expenses effect limited.In addition, the method is 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 to definite value and will affects the precision of reliability evaluating.
Summary of the invention
The technical matters that the present invention solves is: while pyrotechnical devices being carried out to reliability testing for existing employing Success-failure Type test, have that testpieces quantity is many, test funds are high, the problem that measuring accuracy is low, provide a kind of firer's separation nut based on characteristic quantity metering to discharge the test method of reliability, can be when improving measuring accuracy, significant reduction testpieces quantity and testing expenses, reduce experimentation cost.
Technical solution of the present invention is: a kind of firer's separation nut discharges the test method of reliability, comprises the steps:
(1) the lighter gaseous-pressure of firer's separation nut and two parameters of topworks's resistance are defined as to firer's separation nut release characteristic quantities;
(2) lighter is arranged on firer's separation nut cavity volume simulating piece, and on firer's separation nut cavity volume simulating piece, can truly reflects the position setting pressure sensor of topworks's gaseous-pressure before firer's separation nut action; 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, every group of lighter quantity of using is consistent with the lighter quantity of firer's separation nut actual installation, gathers and record the pyrophoric gas pressure x that each pressure transducer obtains
i, i=1,2,3......, m;
(4) to m pyrophoric gas pressure x
icarry out normal distribution-test, if meet normal distribution, calculate the average of m data
with standard deviation s
x, and enter next step; If do not meet normal distribution, finish;
(5) choose l not firer's separation nut testpieces of mounting points firearm, employing charger carries out pneumatic release test l time altogether from the installation site of lighter to the inner chamber inflation of firer's separation nut testpieces, records the atmospheric pressure value of the topworks's action moment charger in each firer's separation nut as the maximum resistance y of topworks
j, j=1,2,3......, l;
(6) the maximum resistance y to l topworks
jcarry out normal distribution-test, if meet normal distribution, calculate the average of l data
with standard deviation s
y, and enter next step; If do not meet normal distribution, finish;
(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) being calculated and desired reliability standard R
bcompare, if R>=R
b, judge that the reliability of firer's separation nut meets the demands; If R<R
b, the structure of firer's separation nut improved and again performed step (2)～(7), until the reliability of firer's separation nut meets the demands.
The described structure to firer's separation nut is improved and is comprised the explosive load that increases firer's separation nut, the gaseous-pressure active area of increase firer separation nut topworks, or the friction factor of reduction topworks rubbing surface.
The present invention's advantage is compared with prior art:
1) the inventive method is defined as firer's separation nut release characteristic quantities by the lighter gaseous-pressure of firer's separation nut and topworks's resistance, by characteristic quantity is repeatedly tested, its test result can truly reflect the performance of firer's separation nut, on this basis the reliability of firer's separation nut is judged, be convenient to grasp the weak link of hot work nut reliability, for hot work nut improves to obtain product reliability, increase foundation is provided;
2) the present invention is based on the reliability demonstration thinking of measurement Law, utilize lighter gaseous-pressure and topworks's resistance performance test data of firer's separation nut to evaluate and test firer's separation nut release reliability, compare with Success-failure Type test, can effective less test sample quantity, reduce testing expenses, shorten the test period;
3) the present invention tests lighter gaseous-pressure by firer's separation nut cavity volume simulation frock, in test process, can not use actual firer's separation nut, therefore can effectively reduce experimentation cost;
4) the inventive method is tested topworks's resistance by pneumatic release test firer's separation nut, can reuse, thereby further reduced the cost of testing after after test, firer's separation nut being recovered.
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 extensively adopting on spacecraft, mainly comprise lighter and topworks, its principle of work is: when firer's separation nut discharges, igniter blast produces high-pressure gas, under the promotion of high-pressure gas, the release of coupling bolt is moved and completed in the inner topworks of firer's separation nut, thereby realize 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 and discharge reliability, make it consistent with " lighter gaseous-pressure is greater than the probability of topworks's resistance ".
2) determine that firer's separation nut discharges the evaluation and test characteristic quantity of reliability.According to the principle of work of firer's separation nut, the present invention determines the characteristic quantity that lighter gaseous-pressure and topworks's resistance are firer's separation nut release reliability evaluating.At this, note lighter gaseous-pressure X, the resistance Y of topworks.
3) firer's separation nut lighter gaseous-pressure test data collection.Before adopting the action of firer's separation nut, (accurately cavity volume profile and the cavity volume volume before the action of simulated fire work separation nut, and simulation frock cavity should have enough intensity and meet reusable requirement after cleaning cavity volume simulation frock.Conventionally can select the steel that are easy to processing, according to cavity volume volume and the intensity index of actual lots firer separation nut, make) carry out igniter blast test.First, lighter is arranged on and is moved in front cavity volume simulation frock, and before action, in cavity volume simulation frock, can truly reflect position (as topworks's piston end surface of gaseous-pressure effect) the setting pressure sensor of the front topworks of firer's separation nut action gaseous-pressure; Then, by igniter blast, gather and record pyrophoric gas pressure, as shown in Figure 2.Get angry m time altogether, note, in m gaseous-pressure test of firer's separation nut lighter, obtains m gaseous-pressure test data x
i(i=1,2 ..., m).
4) firer's separation nut topworks resistance measurement.Mounting points firearm not, and according to actual maneuvering load, firer's separation nut is loaded, adopt charger to the inner chamber inflation of firer's separation nut, to carry out pneumatic release test by lighter installation site, record topworks's action atmospheric pressure value of charger constantly, this atmospheric pressure value is the maximum resistance of topworks, as shown in Figure 3.Note, in l pneumatic release test of firer's separation nut, obtains l the pneumatic release maximum resistance test data y of topworks
j(j=1,2 ..., l).
5) firer's separation nut discharges reliability evaluating.Lighter gaseous-pressure and topworks's resistance measurement data are carried out to normal distribution-test, and based on " stress-intensity " interference theory, firer's separation nut is discharged to reliability and evaluate and test, detailed process is as follows:
1. m the gaseous-pressure test data x obtaining according to experimental test
i(i=1,2 ..., m) with l the resistance measurement data y of firer's separation nut topworks
j(j=1,2 ..., l), according to the method for standard GB/T/T4882, measured data is carried out to test of normality, and can calculate the sample average of gaseous-pressure X and the resistance Y of topworks
standard deviation s
x, s
ybe respectively
If 2., through check, gaseous-pressure X, the resistance Y of topworks all do not refuse normal assumption, order:
3. Calculation of Reliability:
Firer's separation nut discharges reliability R can calculate acquisition by following formula
According to t
r, look into standard < < GB4086.1-1983 statistical distribution numerical tabular normal distribution > > and can obtain Φ (t
r) value, firer's separation nut discharges reliability assessment value.
6) if firer's separation nut discharges reliability assessment result, meet index request, firer's separation nut release reliability compliance test finishes, otherwise, analyze reason, firer's separation nut is improved to design, innovative approach mainly comprises the following aspects:
1. increase firer's separation nut explosive load;
2. increase firer's separation nut topworks gaseous-pressure acting surface area;
3. reduce topworks's rubbing surface friction factor.
After improving, according to 3)～5) firer's separation nut release reliability is carried out to verification experimental verification again.
The content not being described in detail in instructions of the present invention belongs to those skilled in the art's known technology.
Claims (2)
1. firer's separation nut discharges a test method for reliability, it is characterized in that comprising the steps:
(1) the lighter gaseous-pressure of firer's separation nut and two parameters of topworks's resistance are defined as to firer's separation nut release characteristic quantities;
(2) lighter is arranged on firer's separation nut cavity volume simulating piece, and on firer's separation nut cavity volume simulating piece, can truly reflects the position setting pressure sensor of topworks's gaseous-pressure before firer's separation nut action; 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, every group of lighter quantity of using is consistent with the lighter quantity of firer's separation nut actual installation, gathers and record the pyrophoric gas pressure x that each pressure transducer obtains
i, i=1,2,3......, m;
(4) to m pyrophoric gas pressure x
icarry out normal distribution-test, if meet normal distribution, calculate the average of m data
with standard deviation s
x, and enter next step; If do not meet normal distribution, finish;
(5) choose l not firer's separation nut testpieces of mounting points firearm, employing charger carries out pneumatic release test l time altogether from the installation site of lighter to the inner chamber inflation of firer's separation nut testpieces, records the atmospheric pressure value of the topworks's action moment charger in each firer's separation nut as the maximum resistance y of topworks
j, j=1,2,3......, l;
(6) the maximum resistance y to l topworks
jcarry out normal distribution-test, if meet normal distribution, calculate the average of l data
with standard deviation s
y, and enter next step; If do not meet normal distribution, finish;
(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) being calculated and desired reliability standard R
bcompare, if R>=R
b, judge that the reliability of firer's separation nut meets the demands; If R<R
b, the structure of firer's separation nut improved and again performed step (2)～(7), until the reliability of firer's separation nut meets the demands.
2. a kind of firer's separation nut according to claim 1 discharges the test method of reliability, it is characterized in that: the described structure to firer's separation nut is improved and comprised the explosive load that increases firer's separation nut, increase the gaseous-pressure active area of firer's separation nut topworks, or reduce the friction factor of topworks's rubbing surface.
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| CN201410180588.3A CN103954444B (en) | 2014-04-29 | 2014-04-29 | A kind of test method of firer's separation nut release reliability |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200116A (en) * | 2014-09-12 | 2014-12-10 | 上海宇航系统工程研究所 | Assessment method for on-orbit releasing reliability of pressure releasing mechanism |
| CN105069288A (en) * | 2015-07-28 | 2015-11-18 | 北京航空航天大学 | High-overload tightened test design and evaluation method for detector structure |
| CN105571632A (en) * | 2014-10-09 | 2016-05-11 | 北京宇航系统工程研究所 | Mild detonation fuse separation device design verification test method |
| 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 |
| CN111027188A (en) * | 2019-11-27 | 2020-04-17 | 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 |
| CN114593765A (en) * | 2022-05-09 | 2022-06-07 | 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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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200116A (en) * | 2014-09-12 | 2014-12-10 | 上海宇航系统工程研究所 | Assessment method for on-orbit releasing reliability of pressure releasing mechanism |
| CN104200116B (en) * | 2014-09-12 | 2017-04-19 | 上海宇航系统工程研究所 | Assessment method for on-orbit releasing reliability of pressure releasing mechanism |
| CN105571632A (en) * | 2014-10-09 | 2016-05-11 | 北京宇航系统工程研究所 | Mild detonation fuse separation device design verification test method |
| CN105571632B (en) * | 2014-10-09 | 2018-05-18 | 北京宇航系统工程研究所 | A kind of mild detonating fuze separator design evaluation test method |
| CN105069288B (en) * | 2015-07-28 | 2018-03-16 | 北京航空航天大学 | A kind of panel detector structure high overload adds tight experimental design and appraisal procedure |
| CN105069288A (en) * | 2015-07-28 | 2015-11-18 | 北京航空航天大学 | High-overload tightened test design and evaluation method for detector structure |
| 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 |
| CN111027188A (en) * | 2019-11-27 | 2020-04-17 | 西安航天动力研究所 | Sample method for verifying reliability index of gunpowder gas actuating valve |
| 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 |
| CN114593765A (en) * | 2022-05-09 | 2022-06-07 | 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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