SU1397770A1 - Arrangement for exciting damped vibrations - Google Patents

Abstract

The image relates to the vibration technique and can be used when testing objects for seismic effects. The purpose of the invention is to excite three-component poltaharmonich (vskie oscillations. The device contains a hollow body that serves to fix the object to be excited, which includes three pairs of cylinders installed in pairs in three mutually perpendicular directions, and the cylinders are located on opposite sides of the center of the body. The cylinders are located moving elements 5, each made of two pistons 6 and 7. The cavities A and B of the cylinder system are connected to the cf.-r pressure points 8 and 9, which are used to create the initial forces are applied to the base element 5. Between the cylinders there is placed a chamber 10 with an autonomous pressure source 11 in it, separated from the atmosphere of the destroyed membrane 12. The excitation of oscillations in each cylinder on the piston 6 is created by calculated forces, and then simultaneously to all movable elements 5, an additional autonomous force equal to the force of destruction of the membrane 12 is applied by connecting an autonomous pressure source 11. The moving elements are made differently to excite polyharmonic vibrations sovymi. Isp , 2 Il. (L with QO | L /

Description

one

The invention relates to a vibration technique, namely, devices for exciting a vibration that is intended primarily for use in testing an object for seismic effects.

The purpose of the invention is the excitation of three-component polyharmonic vibrations.

Fig. 1 shows a device for driving three-part polyharmonic vibrations; Fig. 2 is a diagram of the device fastening on the object being excited.

The device comprises a hollow body serving for fastening on the object being excited, comprising three pairs of cylinders installed in pairs in three mutually perpendicular directions; while in each direction there is a pair of coaxial cylinders placed on opposite sides of the center of the body. Figure 1 shows: two pairs of cylinders 1, 2, and 3, 4. (Another | one pair of cylinders is located on the | axis, which is perpendicular to the plane of the drawing and is not displayed on it).

In the housing there is a movable part consisting of the number of movables corresponding to the number of cylinders. elements 5, each of which is drawn out of two elements 6 and 7, C cavity, | mi A and B of each of cylinders 1–4 are connected sources 8 and 9 of pressure (for example, powder gas generators), Employees to create an initial differential force on the movable element 5. Grommet 6 is placed between the cavities A and B of the cylinder.

Between cylinders 1-4, a chamber 10 with an autonomous pressure source 11 located therein is placed.

Porschen 7 rolling element 5 is located between the cavity of the chamber 10 and the cavity C, isolated from the cavities A and B of the cylinder.

The cavity of the chamber 10 is separated from the formula of the invention 1. A device for initiating 30 damped oscillations, comprising a floor housing serving to fix a movable part located on the object to be excited to the cylinder, which are connected to its cavity, springs that serve to create an initial difference in mobility

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the part formed in the body of the chambers with an autonomous pressure source placed in it, and a rupture membrane separating the chamber cavity from the atmosphere, which, in order to excite three-component polyharmonic vibrations, the body includes three pairs of cylinders installed in pairs of three mutually perpendicular directions on opposite sides of the center of the body, the movable part contains with the corresponding number of moving elements

the membrane is destroyed by the membrane 12. Places, each filled in the form of two

0

five

with

stray object 15. Platform 14 is suspended on support frame 16 for non-rigid, nit x 17. In each cylinder on the piston 6, located between cavities A and B, create calculated forces by connecting sources 8 and 9 of pressure, and then simultaneously to all moving To the elements of the device 5, an additional autonomous force is applied, equal to the force of destruction of the membrane 12, by connecting an autonomous source II of pressure acting on the gap 7 of each movable element 5. As a result, the movable elements will oscillate one way or another. gonal axes, is excited at this ternary damped oscillation body at peredayuschies driven object. Since the masses of the movable elements 5, located in different cylinders, are different, then, the an oscillatory process is polyharmonic. Different frequencies can be provided. Also, due to the different pressures in the cavities of different cylinders.

Claims (2)

Claim 1. Device for initiating damped oscillations, comprising a hollow body serving for fixing a moving part in the body, forming a cylinder-piston system connected to its cavity, sources of pressure connected to its cavities, which are used to create an initial force difference on the move 0 five the part formed in the housing chamber with an autonomous pressure source placed in it, and a destructible membrane separating the cavity of the chamber from the atmosphere, characterized in that, in order to excite three-component polyharmonic vibrations, the housing includes three pairs of cylinders installed in pairs of three mutually perpendicular directions on opposite sides of the center of the body, the movable part contains the corresponding number of moving elements After destruction of the membrane, parts of it are trapped by a catcher 13. The excitation of three-component damped oscillations using this device is carried out as follows. The case of the device is attached to the board- (| herme 14, on which the air pistons, one of which is located between the cylinder cavities connected to the pressure sources, and the other between the cylinder cavity insulated from them and the chamber. 2. The device according to claim 1, that is to say that the movable elements are designed rag-mops. /five  ////////// L /// / 7/77777 // /////// 7 // 7/777 / FIG. 2 /five }