CN111027188B - Sample method for verifying reliability index of gunpowder gas actuating valve - Google Patents
Sample method for verifying reliability index of gunpowder gas actuating valve Download PDFInfo
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- CN111027188B CN111027188B CN201911184853.4A CN201911184853A CN111027188B CN 111027188 B CN111027188 B CN 111027188B CN 201911184853 A CN201911184853 A CN 201911184853A CN 111027188 B CN111027188 B CN 111027188B
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- 239000003721 gunpowder Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 36
- 238000004880 explosion Methods 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims description 21
- 239000002360 explosive Substances 0.000 claims description 10
- 238000012795 verification Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract 7
- 239000002737 fuel gas Substances 0.000 abstract 2
- 230000003068 static effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The invention provides a hand sample method for verifying reliability indexes of a gunpowder gas actuating valve, which solves the problems of inaccurate reliability index verification and large number of required test hand samples in the existing method. The method comprises the following steps: step one, giving a confidence level r, selecting n test gunpowder gas actuating valves and m tested gunpowder gas actuating valves, and taking energy required by the action of the gunpowder gas actuating valves as reliability characteristic quantity; step two, determining the minimum energy required by the action of the gunpowder gas actuating valve for the n test gunpowder gas actuating valves; step three, carrying out an electric explosion test on the m tested gunpowder fuel gas action valves to obtain the mean value of the energy of the gunpowder fuel gas acting on the cutter
And a variance D; step four, calculating to obtain an allowable limit coefficient
Step five, looking up a normal distribution table QJ1384 to obtain an upper quantile p; sixthly, calculating to obtain the reliability R of the gunpowder gas actuated valve L 。
Description
Technical Field
The invention relates to a method for verifying the reliability of a gunpowder gas actuated valve, in particular to a sample method for verifying reliability indexes of the gunpowder gas actuated valve, which is used for verifying the reliability test of the gunpowder gas actuated valve for a rocket ship.
Background
The gunpowder gas actuating valve has the characteristics of high energy-mass ratio, small volume, good long-term storage property, controllable detonation and output energy and the like, can release considerable energy in a rather short time to complete a preset action, is widely applied to various space aircrafts such as missiles, carrier rockets, satellites, manned spacecrafts, space shuttles and the like, is responsible for safety management of gas paths and liquid paths, namely isolating or cutting off working media, and the reliability of opening and closing of the working medium influences the success or failure of launching tasks, so that the reliability of the working medium is required to be accurately evaluated before the working medium is put into use.
The gunpowder gas actuated valve is a one-time actuated valve, belongs to the category of success or failure, and adopts a success or failure model to evaluate the reliability of the gunpowder gas actuated valve. In addition, although the test sub-sample can be greatly reduced by changing the cavity, for a complex gas path, the reliability index given by the method is higher than the actual difference and even completely inconsistent with the actual reliability index, so that the existing reliability verification method is not suitable for the gunpowder gas actuated valve for the rocket ship with the complex gas flow channel.
Disclosure of Invention
The invention provides a hand sample method for verifying reliability indexes of a gunpowder gas actuating valve, which is a reliability test verification method for the gunpowder gas actuating valve for a rocket ship and is suitable for complex gas flow channels, and solves the problems of inaccurate reliability index verification and large number of required test hand samples in the existing method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a hand sample method for verifying reliability indexes of a gunpowder gas actuating valve comprises the following steps:
step one, giving a confidence level r, selecting n test gunpowder gas actuating valves and m tested gunpowder gas actuating valves, and taking energy required by the action of the gunpowder gas actuating valves as reliability characteristic quantity;
step two, for n test gunpowder gas actuated valves, measuring the relation between the required force F and the displacement S in the movement process of the cutter through a press machine to obtain the maximum force for ensuring the cutter to open the test gunpowder gas actuated valvesSmall amount of displacement S min To determine the minimum energy required for the operation of the gas actuated valve
Thirdly, performing an electric explosion test on the m tested explosive gas actuated valves, and measuring the displacement S of the movement of the cutter d Obtaining E of each tested explosive gas actuated valve d ，E d Is the energy of gunpowder gas acting on the cutter,
then obtaining the mean value of the energy acted on the cutter by the gunpowder gas>
And a variance D;
step four, according to the obtained
D、E min Calculating an allowable limit factor->
Fifthly, looking up a normal distribution table QJ1384 according to a confidence level r given by the system, an allowable limit coefficient k obtained by calculation and a test subsample number n to obtain an upper quantile p;
sixthly, calculating to obtain the reliability R of the gunpowder gas actuated valve according to the upper quantile p L ；
R L ＝1-p。
Further, in step one, n and m are both 10.
Compared with the prior art, the invention has the advantages that:
the invention provides a method for verifying the reliability index test of a gunpowder gas actuated valve, which is simple to implement, measures the energy provided by the gunpowder gas actuation and the minimum energy required by the cutter action through a static method, has better consistency with the real situation, needs a small number of test subsamples, has low test cost and short development period, solves the problem that the existing method is not suitable for a complex gas flow channel, and lays a foundation for the reliability evaluation of the gunpowder gas actuated valve of the complex gas flow channel.
Drawings
FIG. 1 is a flow chart of a small sample method for verifying the reliability index of a gunpowder gas actuated valve.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The invention provides a sample method for verifying the reliability index of a gunpowder gas actuating valve, which does not need to produce a gunpowder gas actuating valve product independently and change the design state of a gunpowder gas actuating valve body and a gunpowder gas flow passage, thereby reducing the number of tests and results and having better conformity with the actual situation.
As shown in FIG. 1, the invention provides a sample method for verifying the reliability index of a gunpowder gas actuating valve based on an energy theory, which comprises the following steps:
1. giving a confidence level r, selecting n test gunpowder gas actuating valves and m tested gunpowder gas actuating valves, and taking energy required by the action of the gunpowder gas actuating valves as reliability characteristic quantity;
2. the relation between the force F and the displacement S required in the movement process of the cutter of the n test gunpowder gas actuated valves is measured through the press, the function of a product is measured in different displacement processes, and the minimum displacement S of the cutter when the test gunpowder gas actuated valve is opened is ensured min To determine the minimum energy required for the operation of the gas actuated valve
3. Performing an electric explosion test on the m tested gunpowder gas-fired action valves (simulating a real gunpowder gas path and a product in a cavity or a product in a design state), and measuring the movement displacement S of the cutter d Obtaining E of each tested explosive gas actuated valve d ，E d For gas energy of gunpowder acting on cuttersThe amount of the compound (A) is,
then obtaining the mean value of the energy acted on the cutter by the gunpowder gas>
And a variance D;
4. obtained according to the foregoing
D、E min Calculating an allowable limit factor->
5. According to a confidence level r given by the system, an allowable limit coefficient k obtained by calculation and the number n of test subsamples, looking up a normal distribution table QJ1384 to obtain an upper quantile p;
6. according to the upper quantile p, calculating to obtain the reliability R of the gunpowder gas actuated valve L ；
R L ＝1-p (1)
The above method is described in detail by taking the calculation of the reliability of a certain gas-driven electric explosion valve as an example.
The method comprises the following steps: when a certain gas drives the electric explosion valve and the confidence level is 0.85, the reliability meets the requirement that the task book is more than 0.91.
The application process comprises the following steps:
1. selecting 10 test gunpowder gas actuated valves and 10 tested gunpowder gas actuated valves, and taking the energy required by the action of the gunpowder gas actuated valves as reliability characteristic quantity (the energy output by an electric detonator of the gunpowder gas actuated valves is taken as the reliability characteristic quantity);
2. the relationship between the force F and the displacement S required in the movement process of the cutter of 10 test gunpowder gas actuated valves is measured by a press machine, and the minimum displacement S of the cutter for ensuring the product function is determined min 10 static pressuresThe static pressure versus displacement of the test piece is shown in attached Table 1.
Attached meter 1 static force and displacement relation of electric explosion valve
Performing functional check on each state in the table, and adding a transverse line to obtain the state which meets the functional check requirement, namely the distance which meets the functional requirement is 13.827 mm-13.970 mm, namely S min Is 13.97mm.
Electric explosion valve S with meter 2 min Corresponding acting force
The minimum energy required by the action of the gunpowder gas actuating valve is 50.2 of the maximum value of the attached table 2, namely E min ＝50.2KN。
3. Simulating a real gunpowder gas path to perform an electric explosion test to obtain the energy of the gunpowder gas acting on the cutter;
the 10 tested explosive gas actuated valves are subjected to an electric explosion test, the minimum displacement of the piston is 14.3mm, the maximum displacement of the piston is 16.35mm, and specific results are shown in an attached table 3.
Attached table 3 piston displacement measurement results after electric explosion
| Serial number | Product number | Displacement/mm after electric explosion |
| 1 | C01-039 | 14.40 |
| 2 | C01-082 | 16.12 |
| 3 | C01-085 | 15.72 |
| 4 | C01-029 | 16.20 |
| 5 | C01-032 | 15.84 |
| 6 | C01-014 | 16.23 |
| 7 | C01-024 | 15.92 |
| 8 | C01-025 | 16.35 |
| 9 | C01-031 | 14.30 |
| 10 | C01-083 | 14.52 |
The piston displacement of the tested explosive gas-fired pneumatic action valve for carrying out the electric explosion test is 14.3-16.20 mm, certain margin is considered, 14.25mm of piston displacement is taken and is brought into an attached table 1 for linear interpolation, the lower limit of the output pressure of the electric explosion gas is 61.2KN, and specific results are shown in an attached table 4.
Attached meter 4 lower limit of electric explosion gas output pressure
Taking the piston displacement as 14.25mm, and calculating the mean value and the variance of the energy of the electric explosion gas required by the movement of the piston acting on the cutter;
the results of the static pressure test (attached table 1) of 10 valve cores are taken into the test result to carry out linear interpolation, so that the mean value of the energy of the electric explosion gas acting on the cutter is 66.65KN, the variance is 5.92KN, and the specific result is shown in attached table 5.
TABLE 5 attached table mean and variance of static force required for piston motion
4. Reliability calculation
Lower limit of electric explosion gas pressure E min Energy average value of gunpowder gas acting on cutter
Variance D, which is brought into the formula +>
Can calculate to get positiveA state distribution coefficient k;
according to the sample subsample n, the confidence level r and the confidence level k, the reference standard QJ1384-88 'normal distribution bilateral allowable limit coefficient table' is consulted, the reliability is greater than 0.962 when the confidence level is 0.85, the requirement of the task book 'greater than 0.91' is met, and specific calculation data are shown in an attached table 6.
Attached Table 6 Dual reliability evaluation
Claims (2)
1. A hand sample method for verifying reliability indexes of a gunpowder gas actuating valve is characterized by comprising the following steps:
step one, giving a confidence level r, selecting n testing explosive gas actuated valves and m tested explosive gas actuated valves, and taking energy required by the action of the explosive gas actuated valves as reliability characteristic quantity;
step two, for n test gunpowder gas actuated valves, measuring the relation between the force F and the displacement S required in the movement process of the cutter of the test gunpowder gas actuated valves through a press machine to obtain the minimum displacement S of the cutter when the test gunpowder gas actuated valves are opened min To determine the minimum energy required for the operation of the gas actuated valve
Thirdly, performing an electric explosion test on the m tested explosive gas actuated valves, and measuring the displacement S of the movement of the cutter d Obtaining E of each tested explosive gas actuated valve d ，E d Is the energy of gunpowder gas acting on the cutter,
then obtaining the average value of the energy of the gunpowder gas acting on the cutter
Sum variance D；
Step four, according to the obtained
D、E min Calculating to obtain the tolerance coefficient
Fifthly, looking up a normal distribution table QJ1384 according to a confidence level r given by the system, an allowable limit coefficient k obtained by calculation and a test subsample number n to obtain an upper quantile p;
sixthly, calculating to obtain the reliability R of the gunpowder gas actuated valve according to the upper quantile p L ；
R L ＝1-p。
2. The hand sample method for verifying the reliability index of a gunpowder gas actuating valve as claimed in claim 1, wherein the method comprises the following steps: in the first step, n and m are both 10.
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