A method for predicting the remaining life of artillery barrels

Abstract

This invention relates to the field of artillery barrel life prediction technology, specifically to a method for predicting the remaining life of an artillery barrel. The method includes: acquiring experimental data from multiple firing operations; acquiring the wear amount per shot for various propellant charges during a single firing; acquiring the current rifling wear at a fixed point; and acquiring the remaining firing count for each propellant charge. This method can accurately determine how many rounds the artillery can fire before the end of its barrel life, thereby preventing premature projectile detonation and barrel explosion accidents.

Description

Technical Field

[0001] This invention relates to the field of artillery barrel life prediction technology, and specifically to a method for predicting the remaining life of artillery barrels. Background Technology

[0002] The artillery firing process is extremely complex, and the barrel is the core component during firing. The high temperature, high pressure, and high speed of the propellant gases generated after ignition have a thermochemical effect on the barrel's interior, as well as the mechanical effect of the projectile itself on the interior. This causes the dimensions and shape of the interior to change slowly, damaging its structure and leading to changes in internal ballistic performance. This reduces the artillery's performance and shortens the barrel's lifespan. When the barrel is worn to a certain extent, it may prevent the completion of firing missions, or even cause premature projectile detonation or barrel explosion, resulting in serious accidents.

[0003] The actual lifespan of a gun barrel is characterized by factors such as the wear and tear of the ammunition belt, loss of projectile stability, decreased firing accuracy, and increased muzzle velocity error, which prevent the gun from achieving its combat objectives. However, the root cause is the erosion and wear of the barrel's inner diameter. As the number of projectiles increases, the barrel's inner diameter continuously increases, reducing the projectile's thrust resistance and starting pressure. This alters the combustion pattern of the propellant gases, leading to a decrease in maximum chamber pressure and muzzle velocity, ultimately affecting the gun barrel's lifespan.

[0004] Because the failure mechanism of the barrel is a complex and integrated process, barrel life cannot be directly used as the prediction object. Current research methods mostly use intermediate variables related to life, such as radial wear, as a bridge for prediction. The main methods currently used fall into two categories: prediction models based on theoretical derivations of internal ballistics, molten layer, or extrusion processes, and prediction models based on data extrapolation from degradation data. Theoretical derivation-based prediction models have lower accuracy but do not require a large amount of experimental data and are less costly. Prediction models based on degradation data obtained through firing tests are more commonly used and more accurate. Degradation data includes: inner diameter wear, chamber growth, muzzle velocity or chamber pressure drop, density change, and range or altitude reduction, etc. Inner diameter wear is widely used because it is easy to measure and yields accurate results.

[0005] Typically, the starting point of a certain basalt groove is taken as the fixed point for testing. When the ablation wear Δd of the barrel's inner diameter at that fixed point reaches or exceeds the specified maximum value Δdmax, the barrel's life ends, and the number of shells fired at this time is the maximum number of shells n.

[0006] Therefore, if the change in Δd can be accurately detected or predicted, and the mathematical relationship Δd=f(n) can be established, the maximum number of projectiles n at the end of the gun barrel's life can be predicted. However, during the entire lifespan of the gun, different propellant charges are fired, including high-powered charges, full-powered charges, and reduced-powered charges. The equivalent full-powered charge conversion factor is usually not easy to obtain. Therefore, obtaining an accurate number of projectiles is quite difficult, which makes it difficult to obtain an accurate barrel life.

[0007] Therefore, in order to more accurately determine the barrel life of artillery, it is necessary to propose a method for predicting the remaining barrel life of artillery. Summary of the Invention

[0008] This invention provides a method for predicting the remaining life of artillery barrels. Based on experimental data, a linear regression method is used to obtain the weighting coefficient of the number of shots corresponding to different firing conditions (i.e., the wear amount of a single shot during a single shot corresponding to the propellant charge number). Then, the wear amount of a single shot under different propellant charges is obtained. By using the remaining wear amount at a determined fixed point, the remaining barrel life under a certain propellant charge number is obtained, thus solving the problem of the difficulty in obtaining accurate barrel life in the past.

[0009] The present invention provides a method for predicting the remaining service life of an artillery barrel, which adopts the following technical solution:

[0010] The experimental data were obtained from multiple firings of the artillery, including rifling wear at fixed points and the number of rounds fired for different propellant charges.

[0011] Based on all experimental data, the wear rate of a single shot during a single firing of various propellant charges was obtained.

[0012] Based on the single-shot wear amount of various propellant numbers during a single firing, a linear fitting relationship between the number of shots fired for all propellant numbers and the fixed-point wear amount of the rifling is obtained;

[0013] Substitute the number of shots corresponding to each type of propellant charge into the linear fitting formula to obtain the current rifling wear at a fixed point.

[0014] Based on the maximum wear at the fixed point at the end of the gun barrel's life, the current wear at the fixed point of the rifling, and the wear per shot for each type of propellant charge, the remaining number of shots for each type of propellant charge is obtained.

[0015] Preferably, the steps for obtaining the single-shot wear amount for various propellant charges during a single firing are as follows:

[0016] Based on the experimental data, a formula was constructed to establish the relationship between the fixed-point wear of the rifling and the number of shots corresponding to all propellant charges;

[0017] The least squares method was used to estimate the wear per shot for various propellant charges during a single firing.

[0018] Preferably, a formula is constructed based on the experimental data of each test to establish the relationship between the rifling wear at fixed points and the number of shots corresponding to all propellant charges:

[0019]

[0020] In the formula, This represents the amount of rifling wear at a fixed point in the data from the Mth experiment; Indicates the intercept coefficient; This indicates the wear amount per shot during a single firing corresponding to the first type of propellant charge. This indicates the wear amount per shot during a single firing for the second type of propellant charge. This represents the single-shot wear amount corresponding to the Nth type of propellant charge; This represents the number of shots fired corresponding to the first type of propellant in the data from the Mth experiment; This represents the number of shots fired corresponding to the second type of propellant in the data from the Mth experiment; This represents the number of shots fired corresponding to the Nth type of charge in the Mth experiment data.

[0021] Preferably, the linear fitting relationship between the number of shots fired for all propellant charges and the fixed-point wear of the rifling is as follows:

[0022]

[0023] In the formula, This indicates the current wear level at a fixed point on the rifling. Indicates the intercept coefficient; This represents the single-shot wear amount corresponding to the i-th type of propellant charge during a single firing. This represents the number of shots fired corresponding to the i-th type of explosive charge; N represents the number of explosive charge types.

[0024] Preferably, the step of obtaining the remaining number of launches corresponding to each type of propellant is as follows:

[0025] The remaining wear at the fixed point is obtained by comparing the maximum wear at the end of the barrel's service life with the current wear at the fixed point of the rifling.

[0026] Based on the remaining wear at a fixed point and the wear per shot for each type of propellant, the remaining number of shots for each propellant type is obtained.

[0027] Preferably, the ratio of the remaining wear at a fixed point to the wear per shot during a single firing of various propellant charges is taken as the remaining number of firings for that type of propellant charge.

[0028] Preferably, the charge number includes: full charge, full charge, and reduced charge.

[0029] The beneficial effects of this invention are:

[0030] Based on experimental data, the weighting coefficients of the number of shots corresponding to different firing conditions (i.e., the wear amount of a single shot in a single firing corresponding to the propellant charge number) are obtained using the linear regression method. Then, the wear amount of a single shot under different propellant charges is obtained. Using the remaining wear amount at a determined fixed point, the remaining barrel life under a certain propellant charge number is obtained. That is, for the artillery throughout its entire life, given the current wear amount, the number of rounds that the artillery can fire before the end of its barrel life can be accurately determined, thereby avoiding accidents such as premature projectile explosion and barrel explosion. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a flowchart of a method for predicting the remaining life of an artillery barrel according to the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] An embodiment of the method for predicting the remaining life of an artillery barrel according to the present invention, such as... Figure 1 As shown, it includes:

[0035] S1. Obtain experimental data when the artillery fires multiple times;

[0036] Specifically, the experimental data include: rifling wear at fixed points and the number of shots fired at different propellant charges; among which, propellant charges include: high propellant charge, full propellant charge, and reduced propellant charge.

[0037] In this embodiment, experimental data were collected during 6 shots, and the specific experimental data are shown in Table 1.

[0038] Table 1

[0039]

[0040] S2. Obtain the single-shot wear amount for various propellant charges during a single firing.

[0041] Specifically, based on all experimental data, the single-shot wear amount for each propellant charge is obtained during a single firing. In this embodiment, a relationship between the fixed-point wear amount of the rifling and the number of shots corresponding to each propellant charge is constructed based on the experimental data for each test. The least squares method is used to estimate the single-shot wear amount for each propellant charge during a single firing.

[0042] Among them, according to statistics M Based on the experimental data, the relationship between the rifling wear at fixed points and the number of shots corresponding to all propellant charges is as follows:

[0043]

[0044] In the formula, This represents the amount of rifling wear at a fixed point in the data from the Mth experiment; The intercept coefficient is a key parameter in a multiple linear regression model. It represents the expected value of the dependent variable when all independent variables are zero. Mathematically, the constant term ensures that the model can adapt to cases where the dependent variable is not zero when the independent variables are zero, essentially acting as a moderating factor. This indicates the wear amount per shot during a single firing corresponding to the first type of propellant charge. This indicates the wear amount per shot during a single firing for the second type of propellant charge. This represents the single-shot wear amount corresponding to the Nth type of propellant charge; This represents the number of shots fired corresponding to the first type of propellant in the data from the Mth experiment; This represents the number of shots fired corresponding to the second type of propellant in the data from the Mth experiment; This represents the number of shots fired corresponding to the Nth type of charge in the Mth experiment data.

[0045] Based on the experimental data from the six trials in this embodiment, the mathematical relationship obtained using linear regression is as follows:

[0046]

[0047] The solution obtained using the least squares method is as follows: d 0 = -0.0230 d 1 = 0.0106 d 2 = 0.0092, d 3 = 0.0032.

[0048] S3. Obtain the current rifling wear at a fixed point;

[0049] Specifically, based on the single-shot wear amount of various propellant numbers during a single firing, a linear fitting relationship between the number of shots fired for all propellant numbers and the fixed-point wear amount of the rifling is obtained; the number of shots fired for each propellant number is then substituted into the linear fitting relationship to obtain the current fixed-point wear amount of the rifling.

[0050] The linear fitting formula for the number of shots fired for all propellant charges and the amount of rifling wear at fixed points is as follows:

[0051]

[0052] In the formula: This indicates the current wear level at a fixed point on the rifling. Indicates the intercept coefficient; This represents the single-shot wear amount corresponding to the i-th type of propellant charge during a single firing. This represents the number of shots fired corresponding to the i-th type of explosive charge; N represents the number of explosive charge types.

[0053] In this embodiment, the single-shot wear amount corresponding to each charge number obtained in step S2 can be used to obtain the linear fitting curve as follows: .

[0054] In the formula: This represents the current wear amount at a fixed point on the rifling. x 1 represents the number of rounds fired for the first type of propellant charge (high-powered charge); x 2 represents the number of rounds fired for the second type of propellant charge (i.e., full propellant charge); x 3 represents the number of shots fired for the third type of propellant (reduced propellant).

[0055] S4. Obtain the remaining number of launches for each type of propellant;

[0056] Specifically, based on the maximum wear at the end of the gun barrel's life, the current wear at the rifling grooves, and the wear per shot during a single firing of various propellant charges, the remaining number of firings for each propellant charge is obtained. Specifically, the remaining wear at the fixed point is obtained based on the maximum wear at the end of the gun barrel's life and the current wear at the rifling grooves; the remaining number of firings for each propellant charge is obtained based on the remaining wear at the fixed point and the wear per shot during a single firing of various propellant charges. That is, in this embodiment, the ratio of the remaining wear at the fixed point to the wear per shot during a single firing of various propellant charges is used as the remaining number of firings for that type of propellant charge.

[0057] In this embodiment, the maximum wear at a fixed point at the end of the barrel's service life is [not specified]. mm, current fixed-point wear of the barrel =6.74mm, then the remaining wear at the fixed point is mm, the remaining number of rounds fired with a certain propellant charge. Then the remaining lifespan of the organ is:

[0058] The remaining number of rounds after firing with full propellant is =1.36 / 0.0092=148 (sends);

[0059] The remaining number of rounds after firing with a high-powered propellant is =1.36 / 0.0106=128 (sends);

[0060] The remaining number of rounds after firing with reduced propellant charge is =1.36 / 0.0032=425 (sends).

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for predicting the remaining life of an artillery barrel, characterized in that, include: The experimental data were obtained from multiple firings of the artillery, including rifling wear at fixed points and the number of rounds fired for different propellant charges. Based on all experimental data, the wear rate of a single shot during a single firing of various propellant charges was obtained. Based on the single-shot wear amount for various propellant charges, a linear fitting relationship between the number of shots fired for all propellant charges and the fixed-point wear amount of the rifling is obtained; substituting the number of shots fired for each current propellant charge into the linear fitting relationship, the current fixed-point wear amount of the rifling is obtained; based on the experimental data for each test, a relationship between the fixed-point wear amount of the rifling and the number of shots fired for all propellant charges is constructed: In the formula, This represents the amount of rifling wear at a fixed point in the data from the Mth experiment; Indicates the intercept coefficient; This indicates the wear amount per shot during a single firing corresponding to the first type of propellant charge. This indicates the wear amount per shot during a single firing for the second type of propellant charge. This represents the single-shot wear amount corresponding to the Nth type of propellant charge; This represents the number of shots fired corresponding to the first type of propellant in the data from the Mth experiment; This represents the number of shots fired corresponding to the second type of propellant in the data from the Mth experiment; This represents the number of shots fired corresponding to the Nth type of propellant in the Mth experiment data; The expression for the current rifling wear at a fixed point is: In the formula, This indicates the current wear level at a fixed point on the rifling. Indicates the intercept coefficient; This represents the single-shot wear amount corresponding to the i-th type of propellant charge during a single firing. This represents the number of shots fired corresponding to the i-th type of explosive charge; N represents the number of explosive charge types. Based on the maximum wear at the end of the gun barrel's life, the current wear at the rifling grooves, and the wear per shot during a single firing of various propellant charges, the remaining number of firings for each propellant charge is determined. The steps for determining the remaining number of firings for each propellant charge are as follows: Based on the maximum wear at the end of the gun barrel's life and the current wear at the rifling grooves, the remaining wear at the fixed point is determined; based on the remaining wear at the fixed point and the wear per shot during a single firing of various propellant charges, the remaining number of firings for each propellant charge is determined.

2. The method for predicting the remaining life of an artillery barrel according to claim 1, characterized in that, The steps to obtain the single-shot wear amount for various propellant charges during a single firing are as follows: Based on the experimental data, a formula was constructed to establish the relationship between the fixed-point wear of the rifling and the number of shots corresponding to all propellant charges; The least squares method was used to estimate the wear per shot for various propellant charges during a single firing.

3. The method for predicting the remaining life of an artillery barrel according to claim 1, characterized in that, The ratio of the remaining wear at a fixed point to the wear per shot for each type of propellant charge is taken as the remaining number of shots for that type of propellant charge.

4. The method for predicting the remaining life of an artillery barrel according to claim 1, characterized in that, The charge numbers include: full charge, full charge, and reduced charge.

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