SU1652850A1 - Impact test bed - Google Patents

Abstract

This invention relates to a testing technique. The purpose of the invention is to expand the operational capabilities of the stand, which affects the test object with two successively arriving shock waves, by ensuring smooth control of the time interval of the impact of shock waves on the object. This is achieved by supplying one of the tubular waveguides, in which the formation of shock waves takes place, with means of braking the shock wave. The stand contains a source of pulse pressure, made in the form of chamber 1, spark plugs 2, nozzles 3 for supplying fuel and a valve unit 4 for supplying air, a shock wave formation device made in the form of a collector 5 and two tubular waveguides 6 and 7 of the same length, installed on the waveguide cut, a device 8 for fixing the test object 9 and means for braking the shock wave, made in the form of rotating plates 7 placed in the waveguide 7, fixed by means of screws 11, the axis of which is perpendicular ikul polar axis of the waveguide 7. The end portion 12 of the waveguides 6 and 7 associated with them flanged compounds 13 and their outlet portions axis parallel to one another and each of them is offset relative to the rest of the waveguide axis. 2 hp f-ly, 2 silt about 3 tf С

Description

The invention relates to test equipment, in particular, to stands for testing objects on the impact of shock waves.

The purpose of the invention is to expand the operational capabilities of a stand acting on a test object with two successively arriving shock waves by ensuring smooth control of the time interval of impact of the shock waves on the object by supplying one of the tubular waveguides, in which the formation of shock waves occurs, by means of a shock wave braking.

Fig. 1 shows the proposed test bench; in fig. 2 is a rotary plate serving to brake the shock wave.

The shock test bench contains a source of pulse pressure, made in the form of chamber 1 and mounted in its walls of the ignition plug 2, nozzles 3 for fuel supply and valve assembly A for air supply, connected to chamber 1, a device for generating shock waves, a collector 5 and two tubular waveguides 6 and 7 of the same length, mounted on the cut of the waveguides 6 and 7, a device 8 for fixing the test object 9 and means for braking the shock wave, made in the form of E 7 rotatable plates 1C fixed in waveguide 7 by means of screws 1 1, the axis of which is perpendicular to the axis of waveguide 7 .. The end parts 12 of waveguides 6 and 7 are connected with flange connections 13, and the axes of their output sections are parallel and each of them is offset relative to the axis of the rest of the waveguide (6 or 7).

The proposed percussion test bench works as follows.

Air is supplied to chamber 1 through valve assembly 4, and fuel is supplied through injector 3. The fuel-air mixture is ignited by a candle 2. The flame front propagates through waveguides n and 7 and, in accordance with the law on the transition of combustion to detonation in long tubes, at some distance from chamber 1, the horizon changes to a state. As a result, waveguides 6 and 7 get dAnatural waves, the frequency of which is determined by the frequency of the mixture initiation by candle 2. The presence of aerodynamic resistance in the form of rotary plates 10 in the waveguide 7 reduces the speed of movement of the shock wave in the waveguide 7 and the test object 9 is affected by multi-time shocks . The magnitude of the delay of the shock wave in the waveguide 7 smoothly

Q is governed by the position of the plates 10 as well as the depth of insertion of screws 11 into the cavity of the waveguide 7. The offset of the axes of the output portions of the end portions 12 of the waveguides 6 and 7 relative to the axes

The 5 remaining parts and the presence of a flange connection 13 between them allow the distance between the centers of action of the shock waves to be adjusted. If necessary, striking only

Q at one point of object 9 per flange

Waveguide 7 is installed with a plug.

The presence of a controlled aerodynamic drag in one of the waveguides makes it possible to test objects for the impact of two successive shock waves with an adjustable amount of delay between the shock waves. The design of the end portions of the 12 waveguides allows the object to be also tested against shock waves acting on one or two of its points. Making the chamber 1 with the spark plug 2, the nozzle 3 and the valve assembly 4 allows the shock loading of the test objects to be repeated many times.

Claims (3)

1. A shock test bench containing a source of pulse pressure, a device for generating shock waves connected to it, made in the form of tubular waveguides, and a device mounted on the waveguide section for fixing the test object, in order to expand the operational capabilities by ensuring smooth adjustment 0 time interval of the impact of shock waves on the test object, it is equipped with means for braking the shock wave in one of the waveguides, and the waveguides are made the same 5 lengths. i 2. A stand according to claim 1, characterized in that the means for braking the shock wave are made in fig. five 0 five rotary plates placed in the waveguide, the axis of rotation of which is perpendicular to the axis of the warhead. 3. Stand according to claims 1 and 2, characterized in that the output axes the portions of the end portions of the waveguides are mutually parallel and each of them is offset from the axis of the rest of the waveguide. y Figure 2