RU2337339C1 - Test bench for apparatus and equipment for high intensive impact effects - Google Patents

Abstract

FIELD: test engineering.

SUBSTANCE: test bench for trials of apparatus and equipment for high intensive impact effect consists of facility for apparatus fixture in form of panel mounted on flexible cables with installed thereon apparatus and recording sensors, and sources of impact effect, made in form of multi layer shock-absorbing rods with pyrotechnic device. At that the source of impact effect is the separable pyrotechnic device covered with a protective case made in form of thin wall hollow cylinder and in the central portion of the cylinder a plate with a hole and thread is installed, the diameter of which is equal to the diameter of the thread of replaceable bushes ensuring standard separation of pyrotechnical device; flanges with faces are made on bushes; besides, diameter of the plate is bigger, than the exterior diameter of the shock absorbing rods; and the plate is attached to the case with a gap, while the length of the protective case is bigger, than doubled length of the separable pyrotechnic device.

EFFECT: upgraded safety at trials for impact effect.

4 dwg

Description

This invention relates to equipment for impact tests and can be used in tests for high-intensity impacts of various, primarily extended, systems consisting of functionally coupled devices, autonomous testing of each of which is insufficient (for example, functional connections are not developed between devices during impacts).

There are many different stands for impact testing. Known tests using vibrating electrodynamic stands, stands with falling tables, etc. (Vibrations in technology: a Handbook in 6 volumes. M: Engineering, vol. 5. Measurements and tests, edited by M. D. Genkina, 1981, p. 476-477). Currently, systems based on vibration stands are most used. The requirements for stands providing the necessary impact are quite high, especially when reproducing influences of high intensity, short duration and complex shape.

The closest is the system according to the patent of the Russian Federation No. 2269105.

Test bench for high-impact impacts of instruments and equipment, consisting of a device for mounting equipment hung on flexible cables with equipment installed and recording sensors, moreover, a honeycomb panel with mortgages is used as a device for installing the test equipment and sources of impact effects made in the form of multilayer damping rods with pyrotechnic devices, the layers being made of materials with different acoustic plating while the cushioning rod with the pyrotechnic device is connected to the honeycomb panel through an adapter made in the form of a cup on a cylindrical leg, which enters as a sleeve into the cylindrical hole of the mortgage, and the inner walls of the cup are mated with the mating part of the shock-absorbing rod using a threaded connection, and the contact surface of the adapter with the honeycomb panel is larger than the contact surface of the mortgage, adopted as a prototype.

The disadvantages of this device include the fact that when using explosive pyrotechnic devices (for example, explosive bolts) at the time of their detonation and destruction, sufficiently large fragments can fly apart at high speed, which poses a serious danger for the test object (especially when testing standard devices and equipment), and for staff.

The task to be solved by the claimed invention is directed is the elimination of these drawbacks, which will allow higher quality impact testing of high intensity impacts.

The solution to this problem is achieved by the fact that the source of the impact is a separable pyrotechnic device, closed by a protective casing made in the form of a thin-walled hollow cylinder, while in the central part of the cylinder there is a plate with a hole with a thread, the diameter of which is equal to the diameter of the thread of interchangeable inserts, providing regular separation pyroelectric devices, with flanges with chamfers made on the inserts, in addition, the diameter of the plate is larger than the outer diameter of the cushioning rods, while the plate attached to the casing with a gap, and the length of the protective casing is more than twice the length of the shared pyrotechnic device.

The essence of the claimed solution is illustrated by drawings, in which Fig. 1 shows a general view of the inventive device for conducting impact tests, in Fig. 2 is a section of a protective casing, in Fig. 3 is a section thereof, and in Fig. 4 is a process for separating a burst bolt. The inventive stand consists of a pyrotechnic device for creating shock effects 1 installed in the shock absorber rod 2, equipment blocks 3, flexible cables 4, devices for fastening the equipment 5, control sensors 6, a protective casing 7. A protective casing 7 (Fig.2, 3) made in the form of a thin-walled hollow cylinder, in the central part of which a plate 8 with a hole 9 with a thread is installed. The diameter of the hole 9 is equal to the thread diameter of interchangeable liners 10, 11, providing regular separation of the pyroelectric device, and on the liners 10, 11 there are flanges 12 with chamfers 13. Between the thin-walled hollow cylinder of the protective casing 7 and the plate 8, gaps 14. The plate 8 is connected to the thin-walled cylinder by a number of points by welding, which provides gaps 14.

The operation of the claimed device can be explained as follows (figure 4).

When conducting shock tests using separable pyrotechnic devices 1 at the moment of undermining of the device, it is separated (a cut of the bolt body due to the different size of the bevels 13 of the inserts 12), the emission of gases and fragments 15, which are captured by the protective casing 7. The presence of gaps 14 between the plate 8 and thin-walled cylinder of the casing 7 allows you to quickly equalize the pressure above and below the plate 8 and does not lead to a strong rejection of the casing due to the reactive effect. The manufacture of the casing 7 symmetrical with respect to the plate 8 simplifies its installation (it does not matter which part the casing fits into the shock absorber). The need to manufacture a casing cylinder 7 not less than twice the size of the bolt is explained by the minimum maximum angle of the chamfers 13 on the flanges of 12 inserts (from 30 ° to 120 ° according to the specifications for the bolts) and the possibility of double reflection of fragments (after which the speed of the fragments approaches zero) . Since the sine of 30 ° is 0.5, then multiplying the two lengths of the bolt by 0.5, we get one length of the casing equal to the length of the bolt up, and accordingly one length down due to symmetry.

Practical example

Figure 1, 2 shows the test bench for antenna systems used on the Express-AM spacecraft.

To ensure the necessary impact spectrum, the following procedure was applied.

A honeycomb panel 5 with a size of 940 × 560 mm with an antenna system installed on it, consisting of an antenna and 4 units of equipment (Figs. 1, 2), was hung on cords 4. A damping rod 2 with a burst bolt 8X54 was docked to the honeycomb panel.

In the first tests, when blasting bolts were detonated, fragments scattered, which was dangerous both for personnel and for the equipment itself. After installing the protective covers, this danger was eliminated. The casing was made of aluminum. The cylinder diameter is 150 mm, its height is 220 mm, the plate thickness is 8 mm, the gap between the plate and the cylinder is ~ 5 mm (bolt size 8X54 ~ 100 mm).

Of the sources of information and patent materials known to the authors, the totality of features similar to the totality of features of the claimed objects is not known.

Claims (1)

Test bench for high-impact impacts of devices and equipment, consisting of a fixture for mounting equipment in the form of a panel hung on flexible cables with equipment and recording sensors installed on it, shock sources made in the form of multilayer shock-absorbing rods with pyrotechnic devices, characterized the fact that the source of the impact is a separable pyrotechnic device, closed with a protective casing, made in the form of a thin-walled a hollow cylinder, while in the central part of the cylinder there is a plate with a hole with a thread, the diameter of which is equal to the diameter of the thread of interchangeable inserts that ensure regular separation of the pyrodevice, moreover flanges with chamfers are made on the inserts, in addition, the diameter of the plate is larger than the outer diameter of the shock absorption rods, the plate is attached to the casing with a gap, and the length of the protective casing is more than twice the length of the shared pyrotechnic device.

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