A device and method for testing the power field of multi-projectile combined action fragments

Abstract

The present invention provides a multi-projectile combined action fragmentation power field test device, comprising a spherical target structure composed of 19 target plates connected in sequence, and a warhead placed horizontally on the frame. The warhead's center of mass coincides with the center of the spherical target, and the warhead's axis coincides with the line connecting the centers of the leading and trailing target plates of the spherical target. This test device enables statistical analysis of the actual power field after the warhead is detonated, avoiding errors and other factors that can lead to biased assessments of the warhead's actual destructive capability using traditional theoretical analysis methods. The present invention also provides a fragmentation power field test method, employing two sets of experiments to statistically analyze the spatial distribution characteristics of warhead fragments. This method can be used to verify the accuracy of traditional theoretical formulas for calculating the distribution pattern of fragment fields formed by multi-projectile warheads.

Description

Technical Field

[0001] The present invention relates to the technical field of power field research, and in particular to a device and method for testing the power field of multi-projectile combined action fragments. Background Art

[0002] Rapid calculation of fragment yield fields is crucial for rapid warhead assessment of targets. In particular, obtaining the explosive yield field of a warhead provides crucial support for the structural design, performance evaluation, and operational use of anti-personnel grenades. Currently, the explosive yield field of a warhead is primarily determined through static testing. Velocity vector synthesis is used within static explosion tests to investigate the dispersion patterns of fragments after the explosion of a moving projectile. However, since the dispersion velocities of thousands of fragments cannot be accurately determined through testing, the dynamic dispersion pattern of fragments cannot be accurately determined through static explosion testing combined with theoretical analysis. Furthermore, static explosion testing struggles to accurately reflect the impact of the terminal velocity of the ammunition on yield field parameters such as the fragment dispersion pattern.

[0003] Therefore, obtaining the power field that reflects the true ballistic characteristics of the terminal has become a technical problem that researchers in this field urgently need to solve. How to obtain the power field after the warhead explosion through experiments is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present invention aims to provide a device and method for testing the power field of multi-projectile combined action fragments, thereby enabling the acquisition of the true state of the power field formed by warhead explosion-driven forces. The specific technical solution is as follows:

[0005] The present invention provides a multi-bomb combined action fragmentation power field test device, such as Figure 1 、 2 As shown, the device includes multiple target plates, warheads, and a frame; the multiple target plates are connected and combined in sequence to form a spherical target structure; the warhead is placed horizontally on the frame, the center of mass of the warhead coincides with the center of the spherical target, and the axis of the warhead coincides with the center line connecting the front and rear target plates among the multiple target plates constituting the spherical target.

[0006] Specifically, there are 19 target plates, and the No. 1 target plate is axially set at 0°, that is, facing the direction of the warhead body, and the No. 19 target plate is axially set at 180°, that is, facing the direction of the warhead tail.

[0007] Specifically, the warhead detonation method is one-end center detonation, and when the warhead is a single projectile, the single explosion detonation center is the center of the spherical target; when the warhead is a multi-projectile, the multi-projectile detonation centers are respectively located on both sides of the line connecting the center of the spherical target and the centers of target plates No. 1 and No. 19, which can be considered as spherical center detonation, and the detonation ends are all facing right.

[0008] Specifically, the target plate is a pine wood target.

[0009] The present invention also provides a multi-projectile combined action fragmentation power field test method, comprising the steps of:

[0010] S1. Design of spherical target layout;

[0011] S2. Design of experimental warhead;

[0012] S3. Build the test environment;

[0013] S4. Select the test detonation method;

[0014] S5. Collect test data after warhead detonation and statistically analyze the test results.

[0015] The construction of the test environment specifically includes:

[0016] S31. Place the warhead horizontally on the frame so that the center of mass of the warhead coincides with the center of the spherical target, and the axis of the warhead coincides with the center line connecting the first and last target plates of the multiple target plates constituting the spherical target;

[0017] S32. Set target plate No. 1 at an axial angle of 0°, ie, facing the warhead body, and target plate No. 19 at an axial angle of 180°, ie, facing the warhead tail;

[0018] S33. Paste kraft paper on the front of each target board.

[0019] The detonation method in step S4 is specifically one-end center detonation.

[0020] The statistical analysis test results in step S5 include spherical target perforation results, multi-bomb coupled fragmentation field results under detonation drive, and factors affecting the multi-bomb coupled damage power field.

[0021] The present invention provides a device and method for testing the power field of multi-projectile combined action fragments, which has the following beneficial effects:

[0022] (1) The fragment power field test device and method provided by the present invention can realize statistical analysis of the actual power field after the warhead is detonated, avoiding the deviation in the evaluation of the actual destructive capability of the warhead caused by factors such as errors existing in traditional theoretical analysis methods.

[0023] (2) The fragment power field test device and method provided by the present invention adopt two groups of experiments to statistically analyze the spatial distribution characteristics of fragments formed by the warhead, which can be used to verify the accuracy of the traditional theoretical formula for calculating the distribution law of the fragment field formed by multi-projectile warheads. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the target layout of the spherical targets of the present invention;

[0025] Figure 2 It is a schematic diagram of the test layout of the present invention;

[0026] Figure 3 It is a schematic diagram of the warhead structure of the present invention;

[0027] Figure 4 This is a diagram showing the perforation results of the spherical target of the present invention;

[0028] FIG5 is a bullet hole distribution diagram of the spherical target test of the present invention, FIG5(a) is the distribution result of single-bomb detonation, and FIG5(b) is the distribution result of multiple-bomb detonation;

[0029] Figure 6 This is a diagram showing changes in the personnel killing area at different relative heights and plane relative positions according to the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings provided by the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions. They are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inside", and "outside" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0033] Example 1: This example provides a multi-projectile combined action fragmentation power field test device, such as Figure 1 、 2 As shown, the device includes multiple target plates, warheads, and a frame; the multiple target plates are connected and combined in sequence to form a spherical target structure; the warhead is placed horizontally on the frame, the center of mass of the warhead coincides with the center of the spherical target, and the axis of the warhead coincides with the center line connecting the front and rear target plates among the multiple target plates constituting the spherical target.

[0034] In this embodiment, there are 19 target plates, and the spherical target formed by the 19 target plates has a radius of 5 m and a recovery angle of 15°.

[0035] In this embodiment, each target plate has a target height of 1.5 m, a target width of 0.87488 m, and a target thickness of 874 mm.

[0036] In this embodiment, the fore and aft target plates are target plate No. 1 and target plate No. 19 respectively, and target plate No. 1 is axially set at 0°, i.e. facing the direction of the warhead body, and target plate No. 19 is axially set at 180°, i.e. facing the direction of the warhead tail.

[0037] In this embodiment, the warhead detonation method is one-end center detonation.

[0038] In this embodiment, when the warhead is a single projectile, the single explosion detonation center is the center of the spherical target.

[0039] In this embodiment, when the warhead is a multi-projectile warhead, the detonation centers of the multiple projectiles are located on both sides of the line connecting the center of the spherical target and the centers of the No. 1 target plate and the No. 19 target plate. It can be considered as a sphere center detonation, with the detonation ends all facing right and the detonation centers gathered at 900 mm.

[0040] In addition, in order to more clearly obtain the number of holes formed by the prefabricated fragments on the spherical target after detonation, this embodiment selected darker and thicker kraft paper to be pasted on the front of each target plate through preliminary experiments.

[0041] This embodiment also verified through the early fragment penetration kraft paper ballistic gun test that the target area of ​​the fragments during penetration is basically consistent with the size and shape of the hole on the kraft paper, so the prefabricated fragments and natural fragment holes formed on the kraft paper can be distinguished.

[0042] In this embodiment, the target plate is a pine wood target.

[0043] Further, such as Figure 3 As shown, the combat parts selected in this embodiment are two groups: single bomb detonation and multiple bomb detonation, and each group is tested three times.

[0044] Specifically, the warhead used in this example is an axisymmetric cylindrical charge warhead, placed on a flat support frame at a height of 1.75 meters above the ground. Before the experiment, the spherical prefabricated fragments were electroplated with copper and nickel layers in different areas. The coating thickness was approximately 0.02 mm. The effect of the coating on the velocity dispersion and mechanical properties of the explosive-driven reaction fragments was negligible. The experiments revealed that copper and nickel elements could be detected at the fragment perforation locations, thereby determining the specific locations of fragment dispersion.

[0045] Specifically, the warhead explosive charge has a diameter of 70 mm and a length of 133 mm, and is a passivated RDX press charge (density 1.71 g / cm 3 , explosion pressure 29.5GPa,, explosion velocity 8425m / s), the shell material is 45 steel, its material properties are shown in Table 1 below, the inner lining wall thickness is 1.5mm, the outer lining wall thickness is 1.5mm, the upper and lower end covers are 8mm thick, and the inner and outer linings and the upper and lower end covers are connected by threaded connections. The diameter of a single steel ball prefabricated fragment is 5mm and the mass is 0.51g. The prefabricated fragments are evenly arranged from top to bottom and then fixed by pouring epoxy resin.

[0046] Table 1 Material parameters of 45 steel

[0047] <![CDATA[Density(g / cm 3 )]]> Yieldsteength(MPa) Elastic modulus (GPa) Hardness Posson 7.83 770 210 200HB 0.22

[0048] During the specific test process, the warhead detonation method is one-end center detonation. The test sample is placed vertically with the detonating end facing upward. The bomb rack is 1.75m high. In order to facilitate the installation and positioning of the detonator, a detonator seat is installed at the detonating end.

[0049] Example 2: This example provides a method for testing the power field of multi-projectile combined action fragments, comprising the following steps:

[0050] S1. Design of spherical target layout.

[0051] In this embodiment, the spherical target is composed of 19 target plates connected in sequence, with a radius of 5m and a recovery angle of 15°.

[0052] S2. Design of experimental warhead.

[0053] In this embodiment, the warhead explosive charge is 70mm in diameter and 133mm long, and is a passivated RDX press charge (density 1.71g / cm 3 , explosion pressure 29.5GPa,, explosion velocity 8425m / s), the shell material is 45 steel.

[0054] S3. Build the test environment, including:

[0055] S31. Place the warhead horizontally on the frame so that the center of mass of the warhead coincides with the center of the spherical target, and the axis of the warhead coincides with the center line connecting the first and last target plates of the multiple target plates constituting the spherical target;

[0056] S32. Set target plate No. 1 at an axial angle of 0°, ie, facing the warhead body, and target plate No. 19 at an axial angle of 180°, ie, facing the warhead tail;

[0057] S33. Paste kraft paper on the front of each target board.

[0058] S4. Select the test detonation method.

[0059] In this embodiment, the warhead detonation method is one-end center detonation; and when the warhead is a single projectile, the single explosion detonation center is the center of the spherical target; when the warhead is a multi-projectile, the multi-projectile detonation centers are respectively located on both sides of the line connecting the center of the spherical target and the centers of the No. 1 target plate and the No. 19 target plate, which can be considered as spherical center detonation, the detonation ends are all facing right, and the detonation centers are 900mm apart.

[0060] In this embodiment, each group of tests of single-bomb detonation and multiple-bomb detonation were repeated 3 times.

[0061] S5. Collect test data after warhead detonation and statistically analyze the test results.

[0062] In this embodiment, the spherical target penetration results after the test, the multi-bomb coupled fragmentation field results under detonation drive, and the influencing factors of the multi-bomb coupled damage power field are statistically analyzed.

[0063] In this embodiment, the spherical target perforation analysis method is specifically as follows:

[0064] After the test, some pine wood target fragments were perforated as shown below: Figure 4 As shown in the figure. Image segmentation, target region identification, and regional shape extraction were performed using the sudden change in pixel grayscale values ​​at the edges of the pine wood target. The resulting pine wood target crater outlines were distinguished using IPP (Image-Pro Plus) and ImageJ image analysis software, and classified and counted. The target plate was processed using Image-Pro to generate a fragment perforation grayscale bitmap. Pre-drawn area lines on the pine wood target were used to divide and count the prefabricated fragment perforations. Each vertical line represents one degree. Hit statistics were performed separately for single and double projectile tests.

[0065] Due to the small geometry of the warhead and the relatively close distance of the pinewood target at 5m, the total number of fragments counted on the target was small. The fragments generated by the spherical target under both experimental schemes were statistically analyzed, as shown in Figure 5, which shows the results of the three-shot test. The spatial distribution of the fragment counts generally conforms to the normal distribution curve for static fragment dispersion. In both cases, the fragments generated by the warhead are concentrated in the interval 9-12, with the majority falling within this range. Furthermore, the figure shows that the overlap between the intervals 6-14 is relatively dense under the multiple-bomb detonation scenario, indicating the presence of spatial superposition in the fragmentation field.

[0066] In this embodiment, the method for analyzing the multi-bomb coupled fragmentation field under detonation driving is specifically as follows:

[0067] Combining existing formulas for calculating the fragmentation field distribution of multiple-projectile warheads and considering the relative positions of multiple projectiles, the spatial distribution characteristics of warhead fragments under two test sets were analyzed. As shown in Figure 5(a), with 85° as the center of detonation, the fragments generated by the single-projectile warhead's dispersion angle are primarily concentrated within the 80-99° range on the pine target at a distance of 5 meters, representing the fragment dispersion characteristics of this prefabricated fragmentation warhead. The multiple-projectile warheads are 0.88 meters apart from the center of detonation, with the same detonation direction. Assuming the spherical target's surface remains unchanged, and the target is shifted 0.44 meters to the left and right, or 5° on the target, the fragments generated by the multiple projectiles are primarily concentrated within the 75-101° range at 5 meters, with the spatial superposition interval located between 85-91°. This is consistent with the experimental data for the spherical target, Figure 5(b), indicating that the spatial distribution of the multiple-projectile fragmentation field is the sum of the spatial distributions of the two single-projectile fragmentation fields, and that the superposition relationship follows a normal distribution.

[0068] In this embodiment, the method for analyzing the factors affecting the multi-missile coupled damage field is as follows:

[0069] Assessing a warhead's lethality against unidentified ground targets and pre-evaluating its damage effects against known targets both require a standard that is both realistic and effective in combat. Currently, both domestic and international opinion favors the use of the damage area as an evaluation metric. This metric not only reflects characteristic parameters related to lethality but also measures the damage effects under different strike conditions. This allows for optimal strike conditions and calculation of the lethality and its changing patterns against different types of targets within combat units, facilitating a comprehensive assessment of warhead usage and providing a basis for improving combat efficiency and deployment dynamism. Under given warhead performance constraints, optimizing the dynamic damage area serves as the objective function for optimizing other warhead parameters. Through optimization calculations, the combination of key warhead characteristic parameters that best matches the given performance criteria is determined. This combination serves as the basis for detailed warhead design and further optimization, providing a key technical approach to ensuring the warhead's actual combat damage effects.

[0070] In order to study the influence of projectile-target posture and the combined effect of multiple projectiles on the damage efficiency of warheads, the fragmentation field of multi-projectile coupled warheads was analyzed. The fragmentation characteristic parameters obtained under the static explosion conditions of single and multi-projectile warheads were used to integrate the speed and scattering direction information of each fragment through self-programming. The flight trajectory of each fragment was equated to a straight line, and the intersection point of the straight line and the ground was calculated. By adjusting different falling speeds, falling angles and explosion heights, the regular distribution of the dynamic fragmentation field of multiple projectiles was calculated, and the killing area distribution map of the fragments hitting the ground was obtained.

[0071] In order to obtain the optimal damage effect of multiple warheads while determining the optimal damage effect of a single bomb, the influence of the relative height and relative position of multiple bomb planes is considered, and the fragment scattering information is combined for programming processing to mark the joint damage area of ​​multiple bombs under different relative heights and relative positions of multiple bomb planes, such as Figure 6 shown.

[0072] Depend on Figure 6 It can be seen that when achieving the optimal damage effect of a single projectile, when the relative height of multiple projectiles is low (H < 0m), the fragment damage area gradually increases with increasing relative height; when the relative height of multiple projectiles is high (H > 0m), the fragment damage area gradually decreases with increasing relative height. In other words, when the relative height is the same, there is an optimal solution for the damage area of ​​multiple projectiles under the same relative position of the planes. When the relative height of multiple projectiles remains unchanged, the damage area of ​​multiple projectiles first increases and then tends to level off as the relative position of the planes increases.

[0073] Those skilled in the art should understand that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Based on the embodiments of the present invention, any changes and modifications made by ordinary technicians in the field of the present invention in accordance with the above disclosure are within the scope of protection of the claims.

Claims

1. A multi-projectile combined action fragmentation power field test device, characterized in that: The device includes multiple target plates, warheads, and a frame; the multiple target bodies are connected and combined in sequence to form a spherical target structure; the warhead is placed horizontally on the frame, the center of mass of the warhead coincides with the center of the spherical target, and the axis of the warhead coincides with the center line of the head and tail target plates among the multiple target plates constituting the spherical target; there are 19 target plates, and the radius of the spherical target formed by the 19 target plates is 5m and the recovery angle is 15°; the head and tail target plates are target plate No. 1 and target plate No. 19 respectively, and target plate No. 1 is set axially at 0°, that is, facing the direction of the warhead body, and target plate No. 19 is set axially at 180°, that is, facing the direction of the warhead tail; the warhead detonation mode is one-end center detonation, and the detonation centers of multiple bombs are respectively located on both sides of the line between the center of the spherical target and the centers of target plate No. 1 and target plate No.

19. When the spherical center is detonated, the detonation ends are all facing right, and the detonation centers are gathered at 900mm.

2. The fragment force field test device according to claim 1, characterized in that: Each target plate has a target height of 1.5 m, a target width of 0.87488 m, and a target thickness of 874 mm.

3. The fragment force field test device according to claim 1, characterized in that: The target plate is a pine wood target.

4. The fragment force field test device according to claim 1, characterized in that: The warhead explosive charge has a diameter of 70mm and a length of 133mm. It is a passivated RDX pressure charge, and the shell material is 45 steel.

5. A method for testing the power field of multi-projectile combined action fragments, comprising the following steps: S1. Spherical target layout design: The spherical target is composed of 19 target plates connected in sequence, with a radius of 5m and a recovery angle of 15°; S2. Experimental warhead design: The warhead explosive charge is 70mm in diameter and 133mm in length, and is a passivated RDX press charge. The shell material is 45 steel. S3. Build the test environment; S4. Select the test detonation method; S5. Collect test data after warhead detonation and statistically analyze the test results; The construction of the test environment specifically includes: S31. Place the warhead horizontally on the frame so that the warhead's center of mass coincides with the center of the spherical target and the warhead's axis coincides with the line connecting the centers of the fore and aft target plates of the spherical target; S32. Position target plate No. 1 at an axial angle of 0°, facing the warhead body. Position target plate No. 19 at an axial angle of 180°, facing the warhead tail. S33. Paste kraft paper on the front of each target board; The detonation method in step S4 is specifically one-end center detonation; The detonation centers of multiple bombs are located on both sides of the line connecting the center of the spherical target and the centers of target plates No. 1 and No.

19. The detonation is carried out at the center of the spherical target, with the detonation ends facing right and the detonation centers gathered at a distance of 900 mm.

6. The fragment force field test method according to claim 5, characterized in that: The statistical analysis test results in step S5 include spherical target perforation results, multi-bomb coupled fragmentation field results under detonation drive, and factors affecting the multi-bomb coupled damage power field.

Images