RU2244910C1 - Bench for impact testing - Google Patents

Abstract

FIELD: testing engineering.

SUBSTANCE: bench has base, guides, platform-pin, device for set the platform-pin in motion along the guides, and device for securing an object to be tested. The device for set the platform-pin is made of a rocket engine. The platform-pin is mounted on supports provided with shoes at a given inclination to the guides and its open side faces the object. The outer side of the platform-pin is provided with aerodynamic shields inclined oppositely with respect to its inclination to the guides. The side which interacts with the object is provided with a deflector. The supports are streamlined.

EFFECT: enhanced reliability of testing.

1 cl, 4 dwg

Description

The invention relates to testing equipment and can be used to test objects for impact.

One of the tasks in the testing technique is to test objects for impact with the ground, in which the emergency interaction with the ground of aircraft or their “black boxes” is simulated.

It should be noted that in such tests both the speed of impact and the shape of the surface of the obstacle during impact are important.

A well-known stand for full-scale testing of products for alternating shock overloads containing a flyover, a hammer, a movable working platform in the direction of impact for mounting the test product and a brake device. In order to improve the accuracy of reproduction of the negative half-wave of shock overloads, it is equipped with a buffer mass installed between the working platform and the brake device with the ability to move in the direction of impact (see AS USSR No. 315075, IPC G 01 M 7/00, publ. 21.09. 1971, bull. No. 28).

A well-known stand for testing mechanical systems for impact, containing a base, overpass, guides fixed on the overpass with inclined and horizontal sections, placed in the guides of the hammer in the form of a trolley, a striking platform with wheels and a device for fixedly securing the test object, mounted motionless at the end guides (see AS USSR No. 1538079, IPC 5 G 01 M 7/00, dated 09/14/1987, publ. 01/23/1990, bull. No. 3). The stand is equipped with a rigidly mounted base between the fixture for mounting the mechanical system under test (test object) and the clip carriage with emphasis and a drummer movably mounted in the clip, which serves to transfer the shock from the carriage to the tested mechanical system. The axles of the wheels of the trolley are located in a plane passing through the center of mass and the center of impact.

A disadvantage of the known stands is the inability to implement the required collision speeds. So, for example, to obtain speeds of ~ 100 m / s at well-known stands (the speed of collision during an aircraft accident according to the requirements of the IAEA Rules ...), their elevated elevations would be ~ 500 m, which is practically impossible.

In addition, for the implementation of the specified angles of impact of the test object (OI) with a movable hammer simulating the effect of soil laid in the platform, it will be necessary to protect the soil surface from flow entrainment, which will also complicate the stand.

The objective of the proposed solution is to create a stand that allows you to accelerate the simulator of soil obstacles to the required speeds without changing the shape of its impact surface.

Technical result:

Provision of testing the impact test for impact with a soil barrier with parameters implemented in full-scale conditions.

The problem is solved in that the proposed stand for shock tests contains a base, guides, a platform-striker and a device for driving the guides of the striking platform, a device for fixing the test object, mounted motionless at the end of the guides, a device for setting the platform in motion the striker is made in the form of a rocket engine, the platform striker is mounted on pylons equipped with shoes, at a given angle of inclination to the guides and faces an open surface to the OI, filled limerizirovannym polyurethane sand predetermined density, bonded to its inner surface, on the outer lateral surface of pin-mounted platform aerodynamic shields at an inclination angle opposite to its installation angle relative to the guide, by interacting with OI fairing installed. Pylons can be made streamlined.

The claimed stand differs from the prototype in that the device for driving the striker platform is made in the form of a rocket engine, the striker platform is mounted on pylons equipped with shoes, at a given angle of inclination to the guides and faces an open surface to the OI, is filled with polymerized polyurethane foam with sand of a given density, bonded to its inner surface, aerodynamic shields are installed on the outer side surface of the platform-striker at an angle of inclination opposite to the angle of its installation about relative to the guide, from the side interacting with the OI, a fairing is installed, and the pylons can be made streamlined.

The execution in the stand for shock testing, containing guides, a device for securing the test object, mounted motionless at the end of the guides, a device for driving the platform-strikers in the form of a rocket engine and the installation of the platform-strikers on pylons equipped with shoes, allows to increase the speed of impact of the platform -bolka with OI.

The installation of the striking platform with the help of pylons at a given angle of inclination to the guides with an open surface to the OI, filling it with polymerized polyurethane foam with sand of a given density ensures the preservation of the shape of the contacting surface that simulates the soil barrier and the density of the barrier at the moment of impact with the OI, i.e. almost full-scale conditions for interaction with OI are provided.

The bonding of polymerized polyurethane foam with sand to the inner surface of the striking platform includes polymerized polyurethane foam with sand in its power circuit, which significantly increases the strength of the platform and, accordingly, allows to reduce its mass and increase acceleration speed without increasing the energy of the rocket engine.

The installation of aerodynamic shields on the outer side surface of the platform at an angle opposite to the angle of its installation relative to the guide unload the shoes and pylons during movement, which helps to reduce their mass and, as a result, increase the acceleration speed without increasing the energy of the rocket engine.

The installation on the platform from the side interacting with the OI, the fairing and the execution of streamlined pylons leads to a decrease in the aerodynamic drag of the system, which also helps to increase the acceleration speed.

As a result, the complex of the above signs allows increasing the platform acceleration speed to 100 m / s, which is 2 times higher than the speed obtained at the prototype stand.

The invention is illustrated by drawings:

- figure 1 presents a side view of the stand;

- figure 2 presents a front view of the stand;

- figure 3 presents a cross section of a platform-striker filled with polymerized polyurethane foam with sand "sandblast";

- figure 4 presents the cross section of the pylon.

The stand for impact tests contains rail guides 2 fixed on a reinforced concrete base 1, at the end of which a device 3 is fixedly mounted in the form of a frame for fastening in a position OI 4 defined in space.

On the rail rails 2 on the pylons 5, equipped with shoes 6, the platform-striker 7 is movably mounted. The platform-striker 7 is installed at a predetermined angle of inclination to the guides 2 and its open surface is facing OI 4. The cavity of the platform 7 is filled with polymerized polyurethane foam with sand ( “Sandblast”) 8 of a given density, bonded (in this example, glued) with its inner surface. On the outer side surface of the striker platform 7, aerodynamic shields 9 are installed at an angle opposite to the angle of its installation relative to the guides, and a fairing 10 is fixed from the side interacting with the OI. On the rail guides 2 on the shoes there is also a device connected to the striker platform 7 for driving the platform-striker 7, made in the form of a rocket engine 11. Pylons 5 can be made streamlined.

The stand works in the following order.

After starting, the rocket engine 11, together with the striking platform 7, along the rail guides 2 accelerates to the OI 4. The strength of the polymerized polyurethane foam with sand 8 ensures the preservation of the shape of its contacting surface when exposed to high-pressure air, which ensures the natural conditions for the meeting of polymerized polyurethane foam with sand 8 with OI 4.

The streamlined shape of the pylons 5 and the fairing 10 fixed in front of the striking platform 7 reduce the aerodynamic drag of the accelerated system.

Aerodynamic shields 9 create a lifting force and unload the shoes 6 during movement, which on the one hand contributes to a decrease in their mass, and on the other hand reduces the friction force of the shoes against the rail guides 2.

All this allows you to increase the collision speed of the “sandblast” 8, simulating the impact of soil barriers, with OI 4 without changing the parameters of the stand (length of the guides 2, engine power 11).

When approaching the striking platform 7 to the OI 4, the “sand plastic” 8 collides with the OI 4 with a given angle of inclination and the required speed.

Thus, the proposed technical solution, in comparison with the prototype, provides the specified parameters (angle and speed of collision) of the meeting of the OI with the soil barrier and allows you to increase more than 2 times the speed of collision.

Claims (2)

1. The stand for impact testing, containing the base, guides, the platform-striker and a device for driving the guides of the striking platform, a device for fixing the test object (OI), mounted motionless on the end of the guides, characterized in that the device for bringing in the platform-striker movement is made in the form of a rocket engine, the platform-striker is mounted on pylons equipped with shoes, at a given slope to the guides and faces with an open surface to the OI, filled with polymerized foam etanom sand with a given density, bonded to its inner surface, on the outer lateral surface of pin-mounted platform aerodynamic plates inclined in opposite direction with respect to its inclination to the guide, and by interacting with OI fairing installed. 2. The stand according to claim 1, characterized in that the pylons are made streamlined.

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