A method and system for judging the aging degree of propellants

Abstract

This invention provides a method and system for judging the aging degree of propellants. The steps include: weighing a propellant sample and shaking it in a solvent to obtain an extract; photographing the obtained extract and extracting RGB data to obtain the RGB values ​​of the extract color; performing liquid chromatography on the obtained extract to obtain the effective stabilizer content; obtaining a series of RGB values ​​and effective stabilizer content values, summing each set of RGB values ​​to establish a correlation model between the RGB sum and the effective stabilizer content; providing the propellant aging degree characterization result based on the obtained correlation model; and the system program executing the aforementioned steps. Using this invention, the aging state of propellants can be accurately and rapidly identified non-destructively through color changes in the propellant extract. The effective stabilizer content can be accurately determined solely by the color parameters of the propellant extract, which can be used to predict the storage life of propellants and achieve accurate and reliable detection of trace components at a high precision level.

Description

Technical Field

[0001] This invention relates to the field of energetic material life assessment technology, specifically to a method and system for judging the aging degree of propellants. Background Technology

[0002] Propellant generally refers to gunpowder loaded in the chamber of a gun or cannon, which uses the large amount of gas produced during combustion to propel a lethal projectile to a predetermined target. It is mainly classified into single-base, double-base, and triple-base propellants. The main components of propellants, such as nitrocellulose and nitroglycerin, have the characteristic of slowly decomposing and releasing nitrogen oxides. Furthermore, the released nitrogen oxides can continue to catalyze the decomposition of these main components. Therefore, stabilizers are often introduced into propellants to absorb the nitrogen oxides released during the aging process of the propellant itself, thereby preventing them from further catalyzing the decomposition of the propellant components and ensuring relatively stable chemical stability during long-term storage.

[0003] Research on propellant aging phenomena and aging evaluation methods mainly rely on the reduction of chemical stabilizer content. Reliable monitoring of stabilizer content is beneficial for accurately understanding the aging status of propellants and predicting their service life. Currently, numerous studies both domestically and internationally have focused on the detection of effective stabilizer content and the assessment of propellant aging status. For example, the national military standard GJB-770B "Test Methods for Gunpowder" specifies the general requirements for general test methods for gunpowder, including gas chromatography for testing effective stabilizer content; Wan Qian et al. from Beijing Institute of Technology used Fourier transform infrared spectroscopy to study the changes in effective stabilizer content in gunpowder at five different temperatures; Farley et al. used Raman spectroscopy to achieve non-destructive and rapid assessment and monitoring of stabilizer effectiveness; and the Xi'an Modern Chemistry Research Institute combined near-infrared diffuse reflectance spectroscopy and chemometrics to monitor the effective stabilizer content of gunpowder during aging at a specific temperature.

[0004] The above methods are all commonly used for detecting stabilizers in propellants, but they all have certain shortcomings. For example, high-performance liquid chromatography (HPLC) requires strict determination of the column type, mobile phase type, and mobile phase ratio, making the operation relatively complex and time-consuming. Raman spectroscopy, Fourier transform infrared spectroscopy, and near-infrared spectroscopy are spectroscopic methods. While they can effectively detect stabilizer content to a certain extent, they cannot completely achieve accurate and reliable detection of trace components (component content between 0.01% and 1.0%). Furthermore, these methods all rely on large instruments and cannot quickly and intuitively provide information on the aging degree of the propellant.

[0005] In general, existing methods for detecting stabilizer content suffer from problems such as cumbersome operation, time-consuming and labor-intensive processes, and low accuracy. Therefore, there is an urgent need to develop a low-cost, rapid, and reliable method and system for determining the aging degree of propellants to ensure the safety and reliability of ammunition. Summary of the Invention

[0006] The purpose of this invention is to provide a low-cost, fast, and reliable method and system for determining the aging degree of propellants.

[0007] To achieve the above objectives, the present invention adopts the technical solution described below.

[0008] A method for determining the aging degree of propellants, comprising the following steps:

[0009] Step 1: Weigh the propellant sample and shake it in a solvent until the sample is completely dissolved to obtain the leachate;

[0010] Step 2: Take a picture of the obtained leachate and extract the RGB data of the leachate color from the captured image to obtain the RGB values ​​of the leachate color.

[0011] Step 3: Perform liquid chromatography on the obtained leachate to obtain the content of effective stabilizer;

[0012] Step 4: Perform steps 1 to 3 for each group of samples to obtain a series of RGB values ​​and effective reagent content values. Sum the RGB values ​​of each group to establish a correlation model between the RGB sum value and the effective reagent content.

[0013] Step 5: Based on the obtained correlation model, give the propellant aging degree characterization results.

[0014] As a preferred embodiment, the solvent is one or two of methanol, acetone, N,N-dimethylformamide, dimethyl sulfoxide, and cyclohexane; the ratio of the propellant sample to the solvent is: propellant sample (0.1-3) g, solvent one (0-25) mL, solvent two (4.8-52) mL; the shaking treatment time is controlled at (1-4.5) h.

[0015] Furthermore, in step 2, the photo is taken in a black box or other space where the light source remains unchanged.

[0016] As a preferred option, in step 4, the summation of RGB values ​​is performed using the method of summing (R+G+B) values ​​and summing (R+G+B) values. 2 +G 2 +B 2 Sum, numerical values ​​(R) 2 +G 2 The better model among "+B) take the sum".

[0017] A propellant aging degree determination system, the computer device of the system including a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that the processor performs the following steps when executing the program:

[0018] S1. Establish a correlation model using multiple sets of standard samples under certain aging conditions:

[0019] S11, control the camera terminal to take pictures of the propellant sample leachate and transmit the obtained pictures to the processor;

[0020] S12, read the feedback image data, and extract the RGB data of the leachate color in the image to obtain the RGB values ​​of the leachate color;

[0021] S13, read the effective stabilizer content value of the propellant sample leachate fed back by the liquid chromatography testing equipment;

[0022] S14. Sum the RGB values ​​of all images of the leachate of each group of propellant samples, and establish a correlation model based on the sum of the RGB values ​​of each group and the content of all effective stabilizers, as shown in Equation (I).

[0023] y=ax-b………………(I)

[0024] In the formula, y represents the peak area of ​​the stabilizer, x represents the sum of RGB values, and a and b are constants;

[0025] S2. Determination of propellant aging degree:

[0026] S21, Read the input propellant type, propellant aging conditions, and propellant leachate image;

[0027] S22, invoke the association model corresponding to the input data;

[0028] S23, calculate and output the peak area of ​​the neutralizing agent based on the correlation model.

[0029] A propellant aging degree determination system, the computer device of the system including a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that the processor performs the following steps when executing the program:

[0030] S31, control the camera terminal to take pictures of the propellant sample leachate and transmit the obtained pictures to the processor;

[0031] S32, read the feedback image data, and extract the RGB data of the leachate color in the image to obtain the RGB values ​​of the leachate color;

[0032] S33, read the effective stabilizer content value of the propellant sample leachate fed back by the liquid chromatography testing equipment;

[0033] S34, sum the RGB values ​​of all images of the leachate from each group of propellant samples.

[0034] S35: Read the input propellant type and propellant aging conditions, and call the association model corresponding to the input data;

[0035] S36, calculate and output the peak area of ​​the stabilizer based on the correlation model.

[0036] As a preferred option, the correlation model for ZY-11 propellant under conditions of 75℃ + RH 60% is y = 3.8x - 1083.3; and the correlation model for ZY-11 propellant under conditions of 85℃ + RH 60% is y = 5.4x - 2884.2.

[0037] Beneficial effects: The solution of this invention can directly and accurately achieve non-destructive testing and rapid identification of the aging state of propellants by observing the color change of the propellant leachate. The effective stabilizer content can be accurately determined solely by the color parameter of the propellant leachate, which can be used to predict the storage life of propellants and provide strong support for the environmental adaptability design of such products. Moreover, it has low requirements for the professional skills of operators, and ordinary technicians can quickly master the operation process, which is easy and simple. Compared with the conventional methods for existing stabilizer testing, the implementation cost of the detection method in this invention is significantly reduced, the detection efficiency is significantly improved, and at the same time, it can achieve accurate and reliable detection of trace components (component content in the range of 0.01% to 1.0%) at a high precision level. Attached Figure Description

[0038] Figure 1 The colors and characteristic values ​​of the leachate of ZY-11 propellant at different aging times under the conditions of 75℃ + RH 60% in Example 1;

[0039] Figure 2 The changes in the RGB summation value of the propellant leachate color and the effective stabilizer content under the conditions of 75℃ + RH 60% in Example 1 are shown.

[0040] Figure 3 The color and characteristic values ​​of the leachate of ZY-11 propellant at different aging times under the conditions of 85℃+RH60% in Example 2;

[0041] Figure 4 The changes in the RGB summation value of the propellant leachate color and the effective stabilizer content under the conditions of 85℃+RH60% in Example 2 are shown. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following description of the embodiments is only for the purpose of helping to understand the principles and core ideas of the present invention, and is not intended to limit the scope of protection of the present invention. It should be noted that for those skilled in the art, improvements made to the present invention without departing from the principles of the present invention also fall within the scope of protection of the claims of the present invention.

[0043] Example 1

[0044] A method for determining the aging degree of a propellant (ZY-11 propellant sample, under conditions of 75℃ + RH 60%), comprising the following steps:

[0045] Step 1: Weigh 1g of propellant sample and shake it in 20mL of anhydrous acetone for 1h until the sample is completely dissolved to obtain the leachate.

[0046] Step 2: Take a picture of the obtained leachate and extract the RGB data of the leachate color from the captured image to obtain the RGB values ​​of the leachate color.

[0047] like Figure 1 As shown, the leachate has different colors at different aging times, and the color gradually deepens as the aging time increases.

[0048] Step 3: Perform liquid chromatography on the obtained leachate to obtain the content of effective stabilizer;

[0049] Step 4: Perform steps 1 to 3 for each sample group to obtain a series of RGB values ​​and effective reagent content values. Sum the RGB values ​​for each group, as shown in Table 1.

[0050] Table 1. Changes in RGB color values ​​and stabilizer content of propellant leachate under 75℃ + 60% RH conditions.

[0051] Aging time (days) R G B RGB summation Peak area of ​​the stabilizer Content of stabilizer (%) 0 191 189 168 548 911.21 100.00 10 199 183 121 503 787.34 86.41 20 186 162 88 436 714.86 78.45 30 189 156 79 424 616.59 67.67 40 191 153 68 412 555.94 61.01 50 189 146 67 402 544.26 59.73 60 190 143 55 388 368.01 40.39 70 189 137 54 380 304.75 33.44 80 188 137 54 379 280.23 30.75 90 176 131 50 357 253.96 27.87 100 169 130 55 354 155.26 17.04

[0052] Based on the obtained values, a correlation model is established between the RGB summation value and the effective stabilizer content, such as... Figure 2 As shown; in this embodiment, the sum of RGB values ​​and the characteristic value of effective neutralizing agent content can be described by a linear relationship. The established linear model has a goodness of fit of 0.93633, indicating that the consumption / retention of neutralizing agent can be obtained by the color change of the propellant leachate.

[0053] Step 5: Based on the obtained correlation model, give the propellant aging degree characterization results.

[0054] Example 2

[0055] A method for determining the aging degree of a propellant (ZY-11 propellant sample, under conditions of 85℃ + RH 60%), comprising the following steps:

[0056] Step 1: Weigh 2g of propellant sample and shake it in 40mL of anhydrous acetone for 2.5h until the sample is completely dissolved to obtain the leachate.

[0057] Step 2: Take a picture of the obtained leachate and extract the RGB data of the leachate color from the captured image to obtain the RGB values ​​of the leachate color.

[0058] like Figure 3 As shown, the leachate has different colors at different aging times, and the color gradually deepens as the aging time increases.

[0059] Step 3: Perform liquid chromatography on the obtained leachate to obtain the content of effective stabilizer;

[0060] Step 4: Perform steps 1 to 3 for each group of samples to obtain a series of RGB values ​​and effective reagent content values. Sum the RGB values ​​for each group, as shown in Table 2.

[0061] Table 2. Changes in RGB color values ​​and stabilizer content of propellant leachate under 85℃ + RH 60% conditions.

[0062] Aging time (days) R G B RGB summation Peak area of ​​the stabilizer Content of stabilizer (%) 0 239 240 235 714 897.07 100.00 6 233 225 189 647 634.84 70.77 12 240 223 163 626 549.17 61.22 18 236 216 147 599 374.28 41.72 24 246 218 133 597 241.34 26.90 30 240 211 126 577 172.40 19.22 36 235 207 116 558 194.71 21.71 42 241 210 111 562 140.31 15.64 48 232 217 113 562 14.98 1.67

[0063] Based on the obtained values, a correlation model is established between the RGB summation value and the effective stabilizer content, such as... Figure 2 As shown; in this embodiment, the sum of RGB values ​​and the characteristic value of effective neutralizing agent content can be described by a linear relationship. The established linear model has a good fit of 0.96982, indicating that the consumption / retention of neutralizing agent can be obtained by the color change of the propellant leachate.

[0064] Step 5: Based on the obtained correlation model, give the propellant aging degree characterization results.

[0065] Example 3

[0066] In this example, the system primarily establishes a database for new samples and quickly predicts their subsequent aging degree. Specifically, it first establishes a correlation model and then predicts the aging degree of the samples based on the obtained model. For samples obtained under various standard aging conditions (defined as standard samples), leachates of each group of propellant samples are prepared in advance (the propellant sample is weighed and shaken in a solvent until the sample is completely dissolved to obtain the leachate). Then, the system is used to predict the aging process of the propellant. A propellant aging degree determination system is provided. The computer equipment of this system includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps:

[0067] S1. Establish a correlation model using multiple sets of standard samples under certain aging conditions:

[0068] S11, control the camera terminal to take pictures of the propellant sample leachate and transmit the obtained pictures to the processor;

[0069] S12, the processor reads the feedback image data and extracts the RGB data of the leachate color in the image to obtain the RGB values ​​of the leachate color;

[0070] S13, read the effective stabilizer content value of the propellant sample leachate fed back by the liquid chromatography testing equipment;

[0071] S14. Sum the RGB values ​​of all images of the leachate of each group of propellant samples, and establish a correlation model based on the sum of the RGB values ​​of each group and the content of all effective stabilizers, as shown in Equation (I).

[0072] y=ax-b………………(I)

[0073] In the formula, y represents the peak area of ​​the stabilizer, x represents the sum of RGB values, and a and b are constants;

[0074] For example, taking the sample in Example 1 as an example, the obtained correlation model is y = 3.8x - 1083.3;

[0075] S2. Determination of propellant aging degree:

[0076] S21, Read the input propellant type, propellant aging conditions, and propellant leachate image;

[0077] After obtaining the aforementioned correlation model, it can be assumed that the RGB summation value of the propellant and the characteristic value of the effective neutralizing agent content can be described by a linear relationship. Therefore, as long as the input propellant type information and propellant aging condition information are consistent with the propellant type and aging information in the correlation model, the system will calculate the propellant RGB summation value based on the input propellant leachate image information, and the system allows the call to the correlation model.

[0078] S22, call the association model corresponding to the input data, that is, call the association model established in step S1;

[0079] S23, calculate and output the peak area of ​​the intermediate agent according to the correlation model, that is, calculate the corresponding peak area of ​​the intermediate agent according to formula (I) and display the result. The peak area of ​​the intermediate agent can be used to characterize the aging degree of the propellant.

[0080] Example 4

[0081] In this example, the system primarily performs lifetime prediction / aging assessment for propellants with an existing database of numerous correlation models. This involves directly calling the corresponding correlation models and providing calculation results characterizing the propellant's aging degree. A single set of propellant sample leachates is prepared beforehand (the propellant sample is weighed and shaken in a solvent until completely dissolved to obtain the leachate). The system then predicts the propellant's aging process. A propellant aging degree determination system is provided, comprising a computer device including a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps:

[0082] S31, control the camera terminal to take pictures of the propellant sample leachate and transmit the obtained pictures to the processor;

[0083] S32, the processor reads the feedback image data and extracts the RGB data of the leachate color in the image to obtain the RGB values ​​of the leachate color;

[0084] S33, read the effective stabilizer content value of the propellant sample leachate fed back by the liquid chromatography testing equipment;

[0085] S34, sum the RGB values ​​of all images of the leachate of each group of propellant samples;

[0086] S35: Read the input propellant type and propellant aging conditions, and call the association model corresponding to the input data; for example: the system stores "ZY-11 propellant under aging conditions of 75℃+RH60%, the association model is y=3.8x-1083.3; ZY-11 propellant under aging conditions of 85℃+RH60%, the association model is y=5.4x-2884.2…", if the technician inputs the propellant type as ZY-11 propellant and the input propellant aging conditions as 85℃+RH60%, then the system directly calls the association model y=5.4x-2884.2;

[0087] S36. Based on the correlation model and the RGB values ​​obtained in step S34, calculate and output the peak area of ​​the stabilizer.

[0088] The scheme described in this embodiment allows for the precise and rapid non-destructive testing and identification of the aging state of propellants by directly and accurately measuring the color change of the propellant leachate. The effective stabilizer content can be accurately determined solely by the color parameter of the propellant leachate, which can be used to predict the storage life of propellants. This provides strong support for the environmental adaptability design of such products. Furthermore, it requires minimal professional skills from operators; ordinary technicians can quickly master the operation process, which is easy and simple. Compared to conventional methods for stabilizer testing, the implementation cost of the detection method in this invention is significantly reduced, and the detection efficiency is significantly improved. Simultaneously, it enables accurate and reliable detection of trace components (component content ranging from 0.01% to 1.0%) at a high precision level.

Claims

1. A method for determining the aging degree of propellant, characterized in that the steps include... include: Step 1: Weigh the propellant sample and shake it in the solvent until the sample is completely dissolved to obtain the leachate; Step 2: Take a picture of the obtained leachate and extract the RGB data of the leachate color from the captured image to obtain the RGB values ​​of the leachate color. Step 3: Perform liquid chromatography on the obtained leachate to obtain the content of effective stabilizer; Step 4: Perform steps 1 to 3 for each group of samples to obtain a series of RGB values ​​and effective reagent content values. Sum the RGB values ​​of each group to establish a correlation model between the RGB sum value and the effective reagent content. In step 4, the RGB value summation is performed using the method of summing the values ​​(R+G+B) and summing the values ​​(R+G+B). 2 +G 2 +B 2 Sum, numerical values ​​(R) 2 +G 2 The better model among "+B) summation"; The propellant aging degree determination system includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: S1. Establish a correlation model using multiple sets of standard samples under certain aging conditions: S11, control the camera terminal to take pictures of the propellant sample leachate and transmit the obtained pictures to the processor; S12, read the feedback image data, and extract the RGB data of the leachate color in the image to obtain the RGB values ​​of the leachate color; S13, read the effective stabilizer content value of the propellant sample leachate fed back by the liquid chromatography testing equipment; S14. Sum the RGB values ​​of all images of the leachate of each group of propellant samples, and establish a correlation model based on the sum of the RGB values ​​of each group and the content of all effective stabilizers, as shown in Equation (I). y =a x -b…………………(Ⅰ) In the formula, y Indicates the peak area of ​​the stabilizer. x This represents the sum of the RGB values, a 、 b is a constant; S2. Determination of propellant aging degree: S21, Read the input propellant type, propellant aging conditions, and propellant leachate image; S22, invoke the association model corresponding to the input data; S23, calculate and output the peak area of ​​the stabilizer based on the correlation model; Step 5: Based on the obtained correlation model, give the propellant aging degree characterization results.

2. The method for judging the aging degree of propellant according to claim 1, characterized in that: The solvent is one or two of methanol, acetone, N,N-dimethylformamide, dimethyl sulfoxide, and cyclohexane; The ratio of the propellant sample and solvent is as follows: propellant sample (0.1~3) g, solvent one (0~25) mL, solvent two (4.8~52) mL; The oscillation processing time is controlled to be (1~4.5) h.

3. The method for judging the aging degree of propellant according to claim 2, characterized in that: In step 2, the photo is taken in a black box or other space where the light source remains unchanged.

4. The method for judging the aging degree of propellant according to claim 3, characterized in that, When the processor executes the program, it also performs the following steps: S31, control the camera terminal to take pictures of the propellant sample leachate and transmit the obtained pictures to the processor; S32, read the feedback image data, and extract the RGB data of the leachate color in the image to obtain the RGB values ​​of the leachate color; S33, read the effective stabilizer content value of the propellant sample leachate fed back by the liquid chromatography testing equipment; S34, sum the RGB values ​​of all images of the leachate of each group of propellant samples; S35: Read the input propellant type and propellant aging conditions, and call the association model corresponding to the input data; S36, calculate and output the peak area of ​​the stabilizer based on the correlation model.

5. The method for judging the aging degree of propellant according to claim 4, characterized in that: For ZY-11 propellant under conditions of 75℃ +RH 60%, the correlation model is as follows: y =3.8 x -1083.3; For ZY-11 propellant under conditions of 85℃ + RH 60%, the correlation model is as follows: y =5.4 x -2884.2.

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