RU2809031C1 - Stand for recording velocities of striking elements for axisymmetric fragmentation ammunition - Google Patents

Abstract

FIELD: military.

SUBSTANCE: invention relates to test benches for fragmentation ammunition. The stand for recording the velocities of striking elements for axisymmetric fragmentation ammunition contains a translucent screen, behind which there are one or more light emitters and high-speed video cameras installed in front of the screen. Limiters are placed between the screen and the ammunition to ensure the dispersion of striking elements in a designated cylindrical sector of the equatorial dispersion angle and the capture of the striking elements outside this sector. The sector axis coincides with the axis of the ammunition and is located parallel to the screen plane. The screen intercepts the zone of meridional dispersion of striking elements. On the line where the screen intersects the median plane of the ammunition, perpendicular to the axis and plane of the screen, scale markers are made.

EFFECT: increasing the accuracy of determining the velocities of striking elements and the reliability of their distribution in the flow along the meridional angle of expansion.

2 cl, 3 dwg

Description

The invention relates to test benches for fragmentation ammunition with fragmentation speeds from 10 m/s to 500 m/s, in order to determine the distribution of velocities of striking elements.

There is a description of the stand ("Physics of Explosion" edited by L.P. Orlenko, FIZMATLIT, 2004, vol. 2, pp. 73-75) designed to determine the distribution of fragments and their velocities over 500 m/s along the meridional expansion angle. The stand is made in the form of a panel target setup (a semi-cylindrical vertical wall), covered with a metal sheet. The ammunition is installed in the center of the half-cylinder in a horizontal position at the height of the center line of the half-cylinder. As a result of the experiment, the number of fragments falling into a given area is determined. The angular distribution of velocities is determined using high-speed movie cameras, which record the time between the moment the shield is illuminated during an explosion and the moment the fragments hit the shield by flashes upon impact, or by the appearance of holes in the shield, illuminated by a pyrotechnic light source located behind the shield.

The disadvantage of this technical solution is the impossibility of determining fragment velocities below 500 m/s, due to the fact that metal sheets cannot be penetrated by fragments. In addition, the disadvantage is a significant error in determining the speed of fragments, since the illumination of the shield during detonation occurs after the shell of the ammunition has already been expanded to a certain radius, the value of which is unknown, therefore, to reduce the error it is necessary to use a shield of a sufficiently large radius.

There is a known method for measuring the speed of projectile fragments (RF Patent No. 2353893, published date 04/27/2009), which consists in detonating a projectile at a known distance from a metal shield. Using a high-frequency camera, the flight time from the explosion site to the shield is measured and the speed of the fragments is determined by calculation. The shield is made in the form of a flat rectangle, with two parallel lines marked on it (the boundaries of the measuring base), located vertically or horizontally. The axis of the projectile is parallel to these lines. In the experiment, the time of movement of the fragmentation front along a known base is measured, and from this time the speed of the fragments is determined by calculation.

The disadvantage of this method is that it is applicable only in the case of a uniform distribution of fragment velocities in the equatorial plane of the ammunition. A disadvantage is also the high cost of testing, since the shield target environment is damaged during testing and its restoration for repeated testing requires significant labor costs.

This technical solution is aimed at eliminating these disadvantages.

The objective of the present invention is to provide optical registration of the passage of a flow of fragments in a wide range of speeds.

The technical result of the proposed invention is to increase the accuracy of determining the velocities of fragments and their distribution in the fragment flow along the meridional angle of expansion. A positive effect is also a reduction in the cost and labor intensity of testing.

The problem is solved due to the fact that the stand for recording the velocities of striking elements for axisymmetric fragmentation ammunition contains a translucent screen, behind which there are one or more light emitters, high-speed video cameras installed in front of the screen, limiters are placed between the screen and the ammunition, ensuring the dispersion of striking elements in the selected area. cylindrical sector of the equatorial expansion angle and capture of striking elements outside this sector, the axis of the sector coincides with the axis of the ammunition and is located parallel to the screen plane, while the screen intercepts the meridional expansion zone of the striking elements, and at the line of intersection of the screen with the median plane of the ammunition, perpendicular to the axis and plane of the screen, scale markers are made.

The use of a translucent screen in the stand, illuminated by a light emitter located behind it, can significantly increase the contrast of the video image of striking elements and eliminates the formation of shadows that complicate the identification of striking elements when the screen is illuminated from the front side by sunlight or other sources.

The use of mirrors as light emitters, directing reflected sunlight onto a translucent screen located in such a way that direct sunlight does not fall on the side of the screen opposite the mirrors, makes it possible to improve the quality of optical registration of the passage of striking elements by increasing the uniformity of illumination of the screen, as well as reduce costs of testing due to the exclusion of artificial light emitters from the stand.

Scale markers are necessary to determine by calculation the velocities of striking elements based on the results of video recording.

Limiters make it possible to obtain a fragmentation flow of a given configuration, convenient for processing video images and determining the velocities of striking elements, and also protect the high-speed video camera and screen from destruction. Thus, it is possible to reuse the stand equipment with a minimum amount of preparatory work before the experiment.

The essence of the invention is illustrated in Fig. 1, Fig. 2 and Fig. 3, which schematically shows a stand for recording the velocities of striking elements for axisymmetric fragmentation ammunition. Figure 1 is a side view of the stand, Figure 2 is a top view of the stand with a light emitter, Figure 3 is a top view of the stand with a mirror.

In Fig. 1, 2 and 3 are indicated:

1 - ammunition;

2 - limiters;

3 - flow of damaging elements;

4 - high-speed video camera;

5 - screen;

6 - light emitter;

7 - scale markers;

8 - mirror;

9 - flow of sunlight.

The stand works as follows. When ammunition 1 is detonated with the help of limiters 2, a flow of destructive elements 3 is formed, having wide meridional and narrow equatorial expansion angles.

During the flight, the flow of damaging elements crosses the recording area of high-speed video cameras 4, which optically register the flow of damaging elements 3 passing parallel to the screen 5, illuminated from behind by light emitters 6. Based on the scale specified by the scale markers 7 and the frame rate of high-speed video cameras 4, individual the velocity of each striking element in the flow and their distribution along the meridional expansion angle is determined.

When using a mirror 8, the backlight of the screen 5 is provided by a directed flow of sunlight 9.

The proposed technical solution makes it possible to increase the accuracy of determining the velocities of striking elements and the reliability of their distribution in the flow along the meridional angle of expansion.

The positive effect achieved by implementing the invention is expressed in reducing the cost and labor intensity of testing.

Claims (2)

1. A stand for recording the velocities of striking elements for axisymmetric fragmentation ammunition, characterized in that it contains a translucent screen, behind which there are one or more light emitters, high-speed video cameras installed in front of the screen, limiters are placed between the screen and the ammunition, ensuring the dispersion of striking elements in a dedicated cylindrical sector of the equatorial expansion angle and capture of striking elements outside this sector, the axis of the sector coincides with the axis of the ammunition and is located parallel to the plane of the screen, while the screen intercepts the zone of meridional expansion of striking elements, and on the line of intersection of the screen with the median plane of the ammunition, perpendicular to the axis and plane of the screen, scale markers. 2. A stand for recording the velocities of striking elements according to claim 1, characterized in that mirrors are used as light emitters, directing reflected sunlight onto a translucent screen located in such a way that direct sunlight does not fall on the side of the screen opposite the mirrors.

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