Bench for dynamical testing of articles

FIELD: testing engineering.

SUBSTANCE: bench comprises flexible longitudinal guide tightened between the supports, carriage, which is mounted on the guide by means of moving members and is used for securing the article to be tested, and control system. The bench has at least one additional flexible longitudinal guide, which is set at an angle to the first one. The guides diverge in the direction of movement of the carriage. The flexible longitudinal guides are made of steel ropes, are arranged symmetrically with respect to the longitudinal axis of the carriage, and are housed by the moving members connected through the carriage body. The surface of the moving members, which are in contact with the guides, are provided with entering chamferings and rounds.

EFFECT: expanded functional capabilities.

3 dwg

 

The invention relates to the field of dynamic testing of products, mainly rockets, missiles and their components and elements.

Known wind tunnel [1], which allows the bench to determine and conduct the testing of aerodynamic characteristics of the projectile (rocket). Fundamentally this structure represents a pipe through which is passed a high-speed air flow. The test projectile or its model is fixed in the pipe still and using the principle of reversibility of movement along a stationary projectile banish the air. Thus, in the wind tunnel is the picture opposite to that observed during the flight of the projectile (rocket) on the trajectory, but this aerodynamic characteristics are not changed. The stillness of the test object is very convenient for measuring characteristics of the projectile, because this substantially simplifies information retrieval and increases the accuracy of measurement compared with the projectile moving along a trajectory. However, the proposed device for testing shells does not play such a significant factor, as longitudinal g force (acceleration)that affect the functioning and performance of many nodes and elements of the projectile (rocket), i.e. does not allow dynamic testing of missiles and rockets.

WPI the walls stand for dynamic testing of rocket thrusters [2], adopted for the prototype. Between two trees or poles (legs) is tensioned steel wire, which is equipped with the ability to move the trolley (cart). Cart fix the test rocket engine (RD). When you start the rocket engine, the truck begins to move through the steel wire, feeling the longitudinal acceleration (overload). The design of this stand allows for dynamic tests and to investigate the influence of the longitudinal overload (acceleration) on the functioning of nodes and elements. However, this stand is designed for dynamic testing of rocket engines of small rods, designed for model rockets, and does not allow dynamic testing of the products, with high values of kinetic energy, such as anti-tank shells and missiles. Let us explain this in the following way.

In the stand [2] the deceleration and trapping of the test items is carried out using a so-called pulse or ballistic pendulum. Overclocked truck with the test EP hits in the fork of a pendulum of known mass. When the collision of the cart pendulum (with a fork) the kinetic energy of the trolley moves in the deviation of the fork of the pendulum, registered with the indicator, leaving a mark on the paper (control system), p is the magnitude of which is determined by the maximum speed of the truck. At the time of collision of the truck with a fork on the subject of RD and cart valid pulse is negative longitudinal overload (acceleration), which is absent in the natural environment and can lead to the destruction of the truck with RD, i.e. does not ensure their salvation. Moreover, the value is negative overload will be higher the higher the carriage speed and more weight fork ballistic pendulum. I.e. to reduce the negative impact of the collision truck with RD on the plug of the pendulum mass of the latter should be as small as possible, but may not be covered under full braking and capture truck fork of the pendulum will be strike hard truck about a support on which the tensioned wire. Thus, there is a technical contradiction, which is that to reduce the negative impact on the subject site weight fork of the pendulum should be kept to a minimum, and to provide deceleration and trapping of the truck with the test KMG weight fork of the pendulum should be the maximum.

In addition, since the thrust force creates RD relative to the suspension elements (motion elements) truck point that is trying to expand the trolley across the movement, then it is possible breakage of the guide wire. Moreover, the more traction RD, the greater the moment, tipping the cart. Traces of the tion, the stand does not allow dynamic testing of anti-tank shells and missiles, which are characterized by the use of so-called pulse starting EP, which time is seconds, and the thrust force when it reaches significant values.

The task, which directed the alleged invention is to enhance the functionality of the stand when approaching the conditions of the tests to full-scale. The technical result achieved in the result of solving the problem, is the ability to capture the tested products with large values of kinetic energy while improving the efficiency and smooth braking.

This object is achieved in that in the known stand for dynamic tests of products, including stretched between supports flexible longitudinal guide installed on it using elements of movement of the carriage to secure test items and control system, it introduced at least one flexible longitudinal guide, diverging at an angle to the first direction of movement of the carriage and connected with the carriage by means of motion elements, while the flexible longitudinal rails made of steel ropes, are located symmetrically relative to the longitudinal axis of the carriage and covered by the elements of motion, with the United through the body of the carriage, and on the surfaces of motion elements in contact with the guides, made of lead-in chamfer or fillet.

Introduction to the design of the stand for more flexible guide and the guides positioned symmetrically relative to the longitudinal axis of the carriage provides a symmetrical loading of the carriage when driving and braking and thereby eliminates the angular spread of the carriage relative to the rails and breakage of the latter.

Running rails at an angle to each other seamlessly to spend the kinetic energy acquired by the carriage with the product upon actuation of the starting motor, friction and deformation of the guides. At the start and the initial phases, where the distance between the guide and the angle differences are small, the resistance to movement of the carriage can be neglected, which allows you to work out the elements of the product in these areas in conditions close to natural.

The use of steel wire rope as a guide, you can simplify the installation of the stand for a considerable length of the stand and to improve the operational characteristics of the stand due to the strength and durability of ropes.

Running on surfaces of motion elements in contact with the guides, lead-in chamfers or fillets eliminates breaks strands and strands of rope when the increase in the process the braking angle between the guide and as a consequence of their breakage.

The invention is illustrated graphics:

figure 1 shows a diagram of the booth side view;

figure 2 shows a scheme of the stand top view;

figure 3 schematically shows a view along arrow a in figure 2.

Stand for dynamic testing of products includes a support 1 and 2, between which is stretched a flexible longitudinal guides 3 and 4, which use the motion elements 5 (sliders) set the carriage 6 for fixing the test items 7, for example anti-tank missiles with a starting pulse rocket motor 8. Rails 3 and 4 in the direction of movement of the carriage 6 diverge at a slight angle α, gradually increasing as it moves the carriage along the guides. The carriage 6 can be performed, for example, in the form of the front 9 and rear 10 clamps fastened together by longitudinal tie-rods 11. The guides 3 and 4, the divergent angle αcovered by motion elements 5 connected through the body of the carriage (the clamps 9 and 10), for example, by means of bolts 12 and nuts 13. On the motion elements 5 are made of lead-in chamfer or fillet 14. The position of the strips 3 and 4 are symmetrically relative to the longitudinal axis of the carriage 6 (axis carriage is located on the bisector of the angle α) provides a symmetrical loading of the carriage during braking and thereby eliminates the angular spread of the carriage relative to N. the sending and breakage of the latter. The carriage 6 is more lightweight, so as not to increase the speed of the rocket mass 7. The effect of full-scale longitudinal acceleration on the nodes and elements of the test rocket 7 when firing the rocket engine 8 is provided through the use of a lighter or another node, for example a lightweight simulator warhead.

Work on the stand as follows: when the trigger pulse rocket engine 8 rocket 7, mounted in the carriage 6, is accelerated and its nodes and elements have natural longitudinal acceleration and inertial loads, as in the beginning of the movement angle α has little value, and pulse rocket engines have a thrust force of several tons and work on the path of ~1 m, the friction force of the carriage 6 on the guides 3 and 4 during acceleration can be neglected. If necessary, decrease during acceleration of the friction force can be achieved by the arrangement of the guides 3 and 4 on this site parallel to each other. This can be achieved, for example, installation guides on at least the distance that fires rocket engine 8, cross connection, such as a rope, destroying the carriage 6 when driving. In the process of acceleration using the control system may be logged, for example, the longitudinal acceleration uslugi elements missile (projectile), deformation elements under the action of inertial forces, the parameters of the functioning of one or another node and element, for example cocked fuse, actuation of the safety and actuators, inertial contactors, etc. as the control system may be used, for example, a set of different sensors connected with side radiotelemetry, terrestrial reception and recording equipment, and high-speed film and video.

The carriage 6 with the test rocket 7 and starting the engine 8 move out of inertia along the guides 3 and 4. As it moves along the guide rails angle of divergence α gradually increases and the frictional force thus gradually increases, i.e. there is a smooth deceleration and trapping of the carriage 6 with the test projectile 7. Lead-in chamfers or fillets 14 made on the surfaces of motion elements 5 in contact with the guides, allow to exclude perestiani strands and strands of rope when you increase the angle α and thereby avoid breakage of the guides. The test rocket 7, saved using a ramp, shall be removed from the carriage 6 and looks around. This test verifies the integrity of its nodes and elements, and taking into account the information obtained through the monitoring system, gives an opinion on the functioning of the nodes and elements of the missile (projectile) and is apach strength.

Thus, the proposed technical solution in comparison with the prototype allows you to capture subjects products with qualitatively larger values of kinetic energy and thus to improve the efficiency and smooth braking of the test items, i.e. the proposed invention provides enhanced functionality of the stand and the approximation of the test conditions to the field.

Sources of information

1. VDDCORE, Umetani, fundamentals of powder rockets, M., Barongis, 1961, s...282.

2. Palistan, Designer, model rockets, M., Mir, 1978, p.205, RES. the prototype.

Stand for dynamic testing of products, including stretched between supports flexible longitudinal guide installed on it using elements of movement of the carriage to secure test items and control system, characterized in that it introduced at least one flexible longitudinal guide, diverging at an angle to the first direction of movement of the carriage and connected with the carriage by means of motion elements, while the flexible longitudinal rails made of steel ropes, are located symmetrically relative to the longitudinal axis of the carriage and covered by motion elements connected through the body of the carriage, and on the surfaces of motion elements, to nachinaushih with rails made of lead-in chamfer or fillet.



 

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