RU1816978C - Pant for investigating object to barrier impingement - Google Patents

Abstract

SUMMARY OF THE INVENTION: in the study of the collision of a body (2) with an obstacle (3), the angle of attack is determined using an optical system by the deviation of two laser rays reflected from the body of light quantum optical generators (4) from the baseline of position-sensitive receivers (5) . The reflection of the rays comes from the flat back surface (6) of the body having a high reflective ability. The axes of the laser are located in mutually perpendicular planes passing through the longitudinal axis of the device for accelerating the body, and intersect this axis at a distance from the barrier equal to the length of the body. 4 ill.

Description

The invention relates to techniques used in impact testing, and can be used to study the process of collision of products with obstacles,

The purpose of the invention is to increase the information content of the study by determining the angles of attack of the body.

Figure 1 shows an apparatus for investigating body impact with an obstruction, general view; Fig. 2 is the angular orientation of the body relative to the longitudinal axis of the acceleration device; Fig. 3 is a diagram for measuring angle a b; figure 4 - diagram of the measurement of the angle a g.

The apparatus for examining the impact of a body with an obstruction contains (Fig. 1) a device for dispersing body 1 (for example, an air gun), an accelerated body 2, an obstruction 3 and an optical system made with two light sources in the form of laser 4 and two position-sensitive receivers light signals 5. Positionally sensitive receivers of light signals 5 can be made in the form of multichannel photodetectors, the photosensitive surfaces of which are arrays of photosensitive elements (photodids, phototransmitters anzistorov etc.). The rear surface 6 of the body 2 is made flat, with high light reflecting ability, which ensures reflection of the light signals of the laser 4. The axis of the laser 4 is located in mutually perpendicular planes 7 passing through the longitudinal axis of the device for accelerating the body 1 (for convenience of description hereinafter, these planes are referred to as horizontal and vertical and are denoted by the letters T and B, respectively). The axes of the laser 4 are oriented in the horizontal and vertical planes 7 so that they cross the longitudinal axis of the device for accelerating the body 1 at a distance from the barrier equal to the length of the body 2. Each of the position-sensitive light signal receivers 5 is optically connected to one of the laser 4 through the back surface 6 of the body 2. The required speed of the collision of the body 2 with the barrier 3 is achieved using the device for accelerating the body 1, while the velocity vector of the body 2 will be directed along the longitudinal axis of the accelerating device 1. In the process e of the collision of the body 2 with the barrier 3 during their asymmetric interaction due to the angular motion of the body 2, its longitudinal axis will deviate from the direction of the velocity vector. This will result in

according to the angle of attack a (figure 2) - i.e. the angle between the velocity vector v and the longitudinal axis of the body 1. The orientation of the axis of the body 1 relative to the horizontal and vertical planes will be characterized by the angles a in and ag:

and in the angle between the velocity vector of the body 1 and the projection of its longitudinal axis on a vertical plane;

and g is the angle between the velocity vector of the body 1 and the projection of its longitudinal axis on the horizontal plane.

In this case, the values of the angle of attack a and the angles a, b are related by the relation:

sin2 a sin2 а в + sln2 «r

or at low angles of attack

twenty

a2 "al + a2 ..

When approaching the body 1 (Fig. 3, 4) to the obstacle 2 light signals OKG 3 get

the non-rear surface of the body 1 and, being reflected from it, enter the position-sensitive receivers of light signals 4. Since the OGG3 are oriented in the horizontal and vertical planes in such a way that their axes intersect the longitudinal axis of the accelerating device at a distance from the obstacle 2, equal to the length of body 1, light signals begin to fall on the back surface of body 1 when it is some distance from the obstacle, when body 1 touches obstacle 2, the light signals enter the center of the back surface of body 1, and the signal stops on the back surface when the body 1 is introduced into the barrier 2. The deviation of the reflected light beam of the laser 3, whose axis is in the horizontal plane (Fig. 3), from the baseline AB of the position-sensitive signal receiver 4 located in the horizontal plane is proportional to the value of sin av, and at small angles of attack, the angle a in. The deviation of the reflected light beam OKG 3, the axis of which is in a vertical plane (Fig. 4), from the base

the line of the LED of the position-sensitive signal receiver 4 located in the vertical plane is proportional to the value of sin a g (or a g at small angles of attack). Determination of the values of av and a g in

the course of the time of reflection of the signals of laser 3 (Figs. 3, 4) from the back surface of the body 1 makes it possible to determine the angle of attack of the body 1 both when it approaches the barrier 2 and during the introduction into it.

Measurement of the angle of attack increases the information content of the study of the collision of the body with an obstacle.

Claims (1)

SUMMARY OF THE INVENTION An apparatus for examining body impact with an obstruction, comprising a body dispersal device, an obstruction and an optical system for measuring body motion parameters, characterized in that, in order to increase the information content of the study by determining the angles of attack of the body, the back surface of the body is flat. high light reflectance0 The optical system is made with two light sources in the form of optical quantum generators (OCGs), the axes of which are located in mutually perpendicular planes passing through the longitudinal axis of the device for accelerating the body and intersect the said longitudinal axis at a distance from obstacles equal to the length of the body and two position-sensitive receivers of light signals, each of which is optically coupled to one of the laser via the back surface of the body. Vi / r-.t