CN111027188A - 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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- CN111027188A CN111027188A CN201911184853.4A CN201911184853A CN111027188A CN 111027188 A CN111027188 A CN 111027188A CN 201911184853 A CN201911184853 A CN 201911184853A CN 111027188 A CN111027188 A CN 111027188A
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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 valveL。
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-to-mass ratio, small volume, good long-term storage performance, 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 airships, space shuttles and the like, is responsible for safety management of gas paths and liquid paths, namely isolation or cutting off working media, and the reliability of opening and closing of the gas actuating valve influences the success or failure of a launching task, so that the reliability of the gas actuating valve is required to be accurately evaluated before the gas actuating valve is put into use.
The gunpowder gas actuated valve is a one-time actuated valve, belongs to a failure type, and adopts a failure type 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 above purpose, the technical solution 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 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 openedminTo determine the minimum energy required for the operation of the gas actuated valve
Step three, carrying out an electric explosion test on the m tested explosive gas-fired action valves, and measuring the movement displacement S of the cutterdObtaining E of each tested explosive gas actuated valved，EdIs 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
And a variance D;
step four, according to the obtained
D、EminCalculating 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 pL；
RL＝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 sample method for verifying reliability index of a gunpowder gas actuated valve according to the invention.
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 closing of 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 by a pressThe system measures the function of the product when different displacements are carried out to obtain the minimum displacement S of the cutter when the test gunpowder gas actuated valve is openedminTo 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 cutterdObtaining E of each tested explosive gas actuated valved，EdIs 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
And a variance D;
4. obtained according to the foregoing
D、EminCalculating to obtain the tolerance coefficient
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 valveL；
RL＝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 determinedminThe relationship between the static pressure and the displacement of 10 static pressure test pieces is shown in the attached Table 1.
Attached meter 1 static force and displacement relation of electric explosion valve
Each state in the table is subjected to functional inspection, and the added horizontal line is the state meeting the functional inspection requirement, namely the distance meeting the functional requirement is 13.827 mm-13.970 mm, namely SminIs 13.97 mm.
Electric explosion valve S with meter 2minCorresponding force
The minimum energy required for the actuation of the powder gas actuated valve is taken as the maximum value 50.2, E, of the attached Table 2min＝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 EminEnergy average value of gunpowder gas acting on cutter
Variance D, brought into formula
Calculating to obtain a normal 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 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 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 openedminTo determine the minimum energy required for the operation of the gas actuated valve
Step three, carrying out an electric explosion test on the m tested explosive gas-fired action valves, and measuring the movement displacement S of the cutterdTo obtain eachE of the tested explosive gas-actuated valved，EdIs 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
And a variance D;
step four, according to the obtained
D、EminCalculating 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 pL；
RL＝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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