RU2331860C1 - Stand for high-intensity shock tests of instruments and equipment - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: facilities are made of mutually perpendicular interconnected cell panels, where shock absorber rods with pyrotechnical devices are mounted along junction lines of the cell panels via a set square adapter with a table set at equal angles to the cell panels. A screw hole for shock absorber rods mounting is placed in the centre of the table, while side surfaces of the set square are attached to inserts of conjugate cell panels.

EFFECT: reduced test time.

5 dwg

Description

The 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 relationships between shock impact devices).

There are many different stands for impact testing. With the help of vibrating electrodynamic stands, stands with falling tables, etc. (Vibrations in technology: a Handbook in 6 volumes. - M.: Mechanical Engineering, vol. 5. Measurements and tests. / Ed. By M. D. Genkin, 1981, pp. 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 to the mating part of the shock-absorbing rod using a threaded connection, and the contact area the surface of the adapter with the honeycomb panel is larger than the contact surface of the mortgage - adopted as a prototype.

The equipment tested on such a system having a spatial mount may be subjected to additional loading, which it does not experience during normal operation, due to the need to remount the equipment after each exposure in one of the attachment planes (different points are used for attachment in each attachment plane). That is, the sequential formation of the required acceleration shock spectra, for example, in each of the three mutually perpendicular equipment attachment planes, leads to additional equipment loading in the other two attachment planes (often with a sufficiently high level of impact), which is not always acceptable during testing. This is especially important during shock testing of equipment for stability, when working equipment is impacted.

In addition, the consumption of pyrotechnic devices is growing, since each time after remounting it is necessary to repeat the entire procedure for forming the test mode.

The aim of the invention is to remedy these disadvantages, which will allow better quality testing for impacts of high intensity.

This goal is achieved by the fact that the device mounting fixture is made of mutually perpendicular honeycomb panels bonded to each other, and damping rods with pyrotechnic devices are installed along the junction lines of the honeycomb panels through an adapter made in the form of a square with a platform located at equal angles to the honeycomb panels moreover, a threaded hole is made in the center of the platform for attaching shock-absorbing rods, and the lateral surfaces of the square are attached to the embedded mortgages Neleus.

The essence of the claimed solution is illustrated by drawings, in which Fig. 1 shows a general view of the claimed device for conducting impact tests: 1 - a fixture for fastening equipment, 2 - blocks of equipment, 3 - control sensors, 4 - a shock absorber rod with a pyrodevice for creating shock effects, in points A, B, C, D, 5 - places of fastening equipment, 6 - flexible cables.

Figure 2 shows a diagram of the application of shock effects in each of the points A, B, C, D at equal angles α _i to the cell panels of the device through the adapter 7.

Figure 3 shows the adapter 7 (for fastening along the junction line of two honeycomb panels of the device) with a shock absorber rod 4 and a pyrodevice 12. The adapter has a platform 8 in which a hole with a thread 9 is made. The adapter is attached to the mortgage 11 of the device 1 using fasteners elements 10.

Figure 4 shows the same adapter in a three-dimensional image.

Figure 5 shows a three-dimensional image of the adapter for the intersection point of three planes (platform 8 has equal angles with all three planes of attachment of the equipment). In figure 4, 5 depreciation rods with pyrodevices conditionally not shown.

The essence of the decision can be explained as follows.

To create an impact, a pyrotechnic device is used that creates the impact required in a certain area. This result is achieved through the use of a pyrodevice in conjunction with a damping rod (acoustic filter). The depreciation rod, acting as an acoustic filter, allows you to change the amplitude of the shock and redistribute the energy of the shock within the frequency range. This allows you to create a shock not only in a small area around the point of application of the shock, but also at a certain distance from it. Impact attenuation occurs differently for different types of structures and directions of action (in the plane of equipment installation or out of the plane). If necessary, several pyrodevices can be connected to the same board and provide shock loading of the entire board with the equipment installed on it.

The test fixture (attachment) is a spatial design made of honeycomb panels on which typical units of devices are placed (currently almost all new spacecraft are made in an unpressurized version, the supporting structure of which are various honeycomb panels). On honeycomb panels there are a large number of embedded elements for installing various equipment. The use of honeycomb panels allows, firstly, to obtain tests on a device that meets the standard operating conditions of equipment and devices, and secondly, the presence of a large number of embedded ones allows you to install pyrotechnic devices at the desired points to create a volumetric impact on the device. The implementation of the site adapter at equal angles to the honeycomb panels provides equal impact on mating honeycomb panels. If the pyrotechnic device (for example, a burst bolt) is detonated, the impact through the shock absorber rod, adapter and embedded ones is transmitted to the honeycomb panels and to the corresponding nodes.

Longitudinal and transverse waves propagate through the honeycomb panel, which are recorded by accelerometers, which allows you to determine the level of the shock absorbing rod, allows you to redistribute the energy of the shock effect within the frequency range by combining layers of materials, and therefore use less powerful pyrodevices and do not overload equipment located in installation area of this device.

An example of practical implementation.

Figure 1 and 2 schematically shows the equipment of one of the spacecraft systems leaky performance. It was necessary to qualify for shock impacts with impact levels up to 1000g in the shock spectrum of accelerations.

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

The device consisted of three honeycomb panels with dynamic mock-ups of equipment installed on them. The maximum size of the honeycomb is ~ 1500 × 600 (the other two are 1500 × 200 and 200 × 600 mm). The device was hung on cushioning cords. To the panels along the junction line at points A, B, C, D through adapters and mortgages, damping rods were attached with burst bolts 8 × 54 (Fig. 1, 2) at points A, B, D and a bolt 8 × 55 (less powerful bolt ) at point C. The rods consisted of layers of different materials (both the number of layers and the materials used differed). The adapter was made of steel. The equipment used made it possible to create qualification levels at points of attachment of the equipment in three directions with the simultaneous detonation of 4 bolts.

From the above practical example, it can be seen that the required impact tests were carried out using standard equipment with minimal manufacturing of new elements. The test design is simple and does not cause playback problems.

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

Claims (1)

Test bench for high-impact impacts of devices and equipment, consisting of a device for fastening equipment made of a honeycomb panel with mortgages and hung on flexible cables, shock sources made in the form of multilayer shock-absorbing rods with pyrotechnic devices connected to the honeycomb panel through an adapter , characterized in that the device for mounting hardware is made of mutually perpendicular honeycomb panels fastened together, and amor insulating rods with pyrotechnic devices are installed along the junction lines of the honeycomb panels through an adapter made in the form of a square with a platform located at equal angles to the honeycomb panels, with a threaded hole in the center of the platform for attaching shock-absorbing rods, and the side surfaces of the square are fixed to the coupled mortars honeycomb panels.

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