SU1290219A1 - Versions of sourse of transverse seismic waves - Google Patents

Abstract

The invention relates to the technique of seismic signal excitation for shear seismic circuits. The circuit of the invention is an increase in the intensity of the impact on the soil. On the radiating plate 1 there are fixed supports 11 with a shaft 13, on which a fixed first magnetic core 2 with windings 7 and 8 and a movable second magnetic core consisting of two moving parts 3 and 4 with windings 9 and 10 are mounted. The windings 7 and 8 are connected in series and connected to a power source. Keys are connected to windings 9 and 10. When supplied from a power source with voltage polarity from both pairs of magnetic cores, forces are generated that act on the magnetic circuit 2 in one direction. Men polarity, change the direction of the current force. Thus, it is possible to increase the amplitude of the force, and with it the intensity of the impact on the ground, without increasing the dimensions of the magnetic cores. 2p.p. f-ly, 9 ill. C b (L h W 15 ////// 7 D / w X / /// / A ////// // /// X у7 //// /// S 7 2 86 S 4. rsd; o

Description

112902

The invention relates to a technique for producing seismic signals by a non-explosive method used in exploration geophysics, in particular in seismic exploration using the transverse 5 wave method.

The aim of the invention is to increase the intensity of the impact on the soil,

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Figure 1 shows the structural scheme of the source of transverse seismic waves in the first embodiment; FIGS. 2-5 are variants of the circuits for turning on its windings; Fig 6 and 7 are time diagrams of currents in the windings and electromagnetic forces illustrating the operation of devices; Fig, 8 is a structural diagram of the source of transverse seismic waves according to the second variant; Fig. 9 is a circuit for including its windings.

The source of transverse seismic waves in the first embodiment (FIG. 1) contains a radiating element made, for example, in the form of radiating plate 1, as well as the first magnetic conductor 2 and the second magnetic conductor consisting of two parts 3 and 4 placed on opposite sides of the magnetic circuit 2, Magnetic circuits 2-4. have grooves facing the air gaps 5 and 6 between the magnetic cores, Magnetic circuit 2 is fixed on the radiating plate 1, and Magnetic cores 3 and 4 are made movable. Another possible scheme is the installation of magnetic cores 2-4, in which the magnetic cores 3 and 4 are mounted on the radiating plate 1, the magnetic core 2 is made movable, two windings 7 and 8 are laid in the slots of the magnetic circuit 2 and two additional windings 9 are laid in the slots of magnetic cores 3 and 4 and 10, the windings 7 and 9, as well as 8 and 10 form two pairs of windings laid in slots facing the air gaps common to each pair 5 and 6. Support poles II are fixed on the radiating plate, in which bearings 12 are mounted , Magnetic cores 3 and 4 are fixed on the shaft At 13, passing through the axial hole in the magnetic conduit 2 and resting on the bearing 12, the springs 14 fix the magnetic conduits 3 and 4 in the initial position. To the radiating plate 1 attached below the transmitting elements 15, which

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buried in the ground and are designed to transmit to him a perturbation. effort

The windings 7 and 8 of the magnetic circuit 2 are interconnected in series and connected to the power supply 16 (FIG. 2). The windings 7 and 8 can also be connected in parallel, in a differential scheme, and they may not have a single common point. The power supply 16 may be as non-reversible, i.e. providing the formation of current pulses in the windings of the same polarity, and reversible, i.e. providing the formation of current pulses in the windings of different polarities,

Controlled keys 17 and 8 are connected to windings 9 and 10. As switches 17 and 18, various switching devices can be used, both controllable and unmanaged, having both one-sided and two-sided conductivity. For example, keys 17 and 18 can be made in the form of semiconductor devices: diodes, thyristors, dinistors, transistors, optoelectron1-1 devices, etc., as well as mechanical and electromechanical switches: relays, reed switches, etc. When used as switches 17 and 18 of controlled switching devices, power supply 16 can be either reversible or non-reversible, and when using uncontrolled gates as switches 17 and 18, it is most advisable to use reversible power supply 16.

In addition to the circuit in FIG. 2, other options are possible for the connection of the windings of the source of transverse waves of waves. Thus, in the circuit in FIG. 3, windings 9 and 10 are connected to the power supply source 16, and keys 19 and 20 are connected to windings 7 and 8; in the circuit of FIG. 4, the windings 8 and 9 are connected to the power source 16, and the TERMINAL 21 and 22 are connected to the windings 7 and O; windings 7 and 10 are connected to the power source 16 in the circuit in FIG. 3, and keys 23 and 24 are connected to windings 8 and 9. All the diagrams in FIGS. 2-5 unite a common pattern: in each pair of windings laid into slots, facing toward common air gaps (dp pairs of windings

7 and 9 obi; it is an air gap 5, and for a pair of windings 8 and 10 obshkm there is an air gap 6), one winding is connected to a power source, and a key is connected to the second winding.

6 and 7, curve 25 is a time diagram of the current in the windings 7 and 8j curve 26 is a time diagram of the current in the winding 9; curve 27 — time — diagram of the electromagnetic repulsive force acting between magnetic lines 2 and 3; curve 28 is a temporal diagram of the electromagnetic force of the attraction acting between the magnetic cores 2 and 4,

The source of transverse seismic waves in the first embodiment is as follows,

In the initial state, under the action of the springs 14, the magnetic cores 3 and 4 occupy a middle position, so that the air gaps 5 and 6 are the same.

At the initial time t

(Fig. 6) the windings 7 and 8 from the power supply 16 are energized, for example, by the polarity indicated in Fig. 2, and at the same time one of the switches is closed, for example, a switch 17; A current pulse i is formed in the windings 7 and 8 ,, the direction of which is shown in FIG. 2, and the timing diagram in FIG. 6 (curve 25). In this case, in the windings 9 and 10, an emf is induced, the polarity of which is indicated in FIG. 2.

The EMF induced in the winding 9 causes a secondary current i, the direction of which is shown in figure 2, and the timing diagram in figure 6 (curve 26). At time t, (Fig. 6), when current i reaches zero, key 17 is opened. The flow of currents i, and windings 7 and 9, respectively, causes the appearance of magnetic fluxes F and Fn, covering the indicated windings as shown in Fig. The interaction of the magnetic fluxes F and F with currents i and i leads to the appearance of a pair of electromagnetic repulsive forces F between the magnetic conductor 3 and the left half of the magnetic conductor 2, the direction of action of which is shown in, and the time diagram is shown in Fig. 7 (curve 27).

Indudirovanna in the winding 10 emf does not cause a secondary current in it,

since the open key 18 prevents this. As a result of the flow of current i. The winding 8 in the right half of the magnetic circuit 2 forms a magnetic flux, spanning 1 windings 8 and 10 as shown in figure 1, and causing the appearance of a pair of electromagnetic forces F between the magnetic core 4 and the right half of the magnetic circuit 2, the direction of which shown in figure 1, and the timing diagram / - figure 7 (curve 28).

The resultant force acting on the magnetic circuit 2 is the sum of the electromagnetic repulsive forces F from the magnetic core 3 and the attraction F. to the magnetic circuit 4. The resulting force is transmitted rigidly connected to the magnetic core 2 of the radiating plate 1, and from it through the transmitting elements 15 seismic waves are excited.

Dp of changing the direction of the resultant force to the opposite, it is necessary to close the key 18 at the moment in time (6), and leave the key 17 open. In this case, an electromagnetic repulsive force acts between the right half of the magnetic circuit 2 and the magnetic core 4, and between the left half of the magnetic core 2 and the magnetic core 3, an electromagnetic force of attraction,

When using uncontrolled valves as keys 17 and 18, changing the direction of the disturbing force of the transverse seismic source is achieved by changing the polarity of the voltage of the power source 16.

The source of transverse seismic waves in the first embodiment works in the same way as described in cases when the magnetic cores 3 and 4 are mounted on the radiating plate 1, and the magnetic circuit 2 is made movable (the disturbing force is transmitted to the radiating plate 1 through the magnetic cores 3 and 4) or when you turn on the windings 7-10 according to any of the schemes shown in figure 3-5.

The source of transverse seismic waves according to the second variant (Fig. 8) contains a radiating element made, for example, in the form of a radiating plate 29, as well as the first magneto 51

water, consisting of two parts 30 and 31, and a second magnetic circuit 325, with m-agnitoprovody 30 and 31 placed on opposite sides of the magnetic circuit 32, the magnetic cores 30-32 have grooves facing the air gaps 33 and 34 between the magnetic cores, The magnetic core 32 is fixed on the radiating plate 29, and the Magnetic cores 30 and 31 are made under the sliding plates. Another possible scheme is the installation of magnetic cores 30-32, in which the magnetic cores 30 and 3I are mounted on the radiating plate 29, and the magnetic core 32 is made movable, two windings 35 and 36 are laid in the slots of the magnetic cores 30 and 31, and an additional winding 37 is laid in the slots of the magnetic core 32. On the radiating plate 29 there are fixed supports 38 in which the slide bearings 39 are mounted. The magnetic cores 30 and 31 are fixed on the shaft 40, which passes through the axial hole in the magnetic conduit 32 and supports the bearings 39. The springs 41 fix the magnetic circuits 30 and 31 in the initial position, the transmitting elements 42, which are recessed, are attached to the radiating plate 29. Into the ground and intended for the day of transmission to it of disturbing force.

In order to increase the amplitude of movement of the radiating plate 29 with the insufficient mass of the moving magnetic cores 30 and 31, additional weights can be attached to the latter (not shown in FIG. 8)

The winding 37 of the magnetic circuit 32 is connected to the power source 43, and to the windings 35 and 36 of the magnetic cores 30 and 31 are connected controllable switches 44 and 45 (FIG. 9),

The power source 43 can be either non-reversible or reversible. As switches 44 and 45, various switching devices, both controlled and unmanaged, having both one-sided and two-sided conductivity, can be used. For example, keys 44 and 45 can be made in the form of semiconductor devices: diodes, thyristors, dinistors, transistors of optoelectronic devices, and so on, and also mechanical and electromechanical switches: relays, reed switches, and so on. When used as keys 44 and 45 controlled commi

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The power supply 43 may be either reversible or non-reversible, and when using uncontrolled gates as keys 44 and 45, it is most advisable to use a reversible power supply 43.

The source of transverse seismic waves on the second option is as follows,

In the initial state, under the action of springs 41, the magnetic cores 30 and 31 occupy a middle position, so that the air gaps 33 and 34 are the same.

At the initial time t, (FIG. 6), the winding 37 is energized from the power source 43, for example, by the polarity shown in FIG. 9, and at the same time one of the switches is closed, for example a switch 44, a current pulse is generated in the winding 37 i, the direction of which is shown in FIG. 9, and the timing diagram in FIG. 6 (curve 25). In this case, EMFs are induced in the windings 35 and 36, the polarity of which is indicated in FIG. 9,

The emf induced in the winding 35 causes a secondary current i, the direction of which is shown in fig. 9, and the timing diagram in fig. 6 (curve 26). At time t (fig. 6) when current 2 reaches zero, 1 pc 44 opens, Induced; 1I in the winding 36 does not cause an emf in the secondary current, since this is prevented by the open key 45, B, as a result of the flow of currents i. and i magnetic fluxes Φ and Φ are formed in the magnetic cores, with the flux Φ comprising simultaneously the windings 36 and 37, and the flux Φ - only the winding 35, the direction of the magnetic fluxes Φ, and Φ is indicated in FIG. 8,

The interaction of magnetic fluxes f, and f with currents i and ij leads to the appearance of a pair of repulsive electromagnetic forces F between the magnetic cores 32 and 30, the direction of action of which is shown in fig. 8, and the time diagram in fig. 7 (curve 27). At the same time, the magnetic flux. F causes the appearance of a pair of electromagnetics of the force F of attraction between the magnetoconductors 32 and 31, the direction of which is shown in FIG. 8, and the time diagram in FIG. 7 (curve 28),

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The resultant force acting on the magnetic core 32 is the sum of the electromagnetic repulsive forces F from the magnetic core 30 and the attraction F to the magnetic circuit 31. The resulting force is transmitted rigidly connected to the magnetic core 32 of the radiating plate 29, and from it through the transfer element 1 to the ground 42 , as a result of which seismic waves are excited,

Dp of changing the direction of the resultant force to the opposite, it is necessary at the time tp (Fig. 6) to close the key 45, and leave the key 44 open. In this case, the magnetic repulsive force will act between the magnetic cores 32 and 31, and the electromagnetic magnetic force will act between the magnetic cores 32 and 30.

When using uncontrolled valves as switches 44 and 45, changing the direction of the perturbing force of the transverse seismic source is achieved by changing the polarity of the voltage of the power source 43.

The source of transverse seismic waves according to the second variant works in the same way as described in the case when the magnetic cores 30 and 31 strengthened No. 1 on the radiating plate 29, and the magnetic core 32 is made movable; wherein the disturbing force is transmitted to the radiating plate 29 through the magnetic cores 30 and 31.

The use of the invention makes it possible to increase the intensity of the impact on the soil without increasing the size of the magnetic pipelines, which increases the intensity of the excited seismic waves and thereby increases the seismic efficiency of the source.

The source of transverse seismic waves according to the second variant as compared with the first option allows to reduce the consumption of copper, since it contains not four, but three windings, and the consumption of electrical steel going from an ei-shhe medium magnetic core. At the same time, the source according to the first variant has a wider range of adjustment of output characteristics than the second vadiant, due to the possibility of varying the circuits

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Claims (1)

1. The source of transverse seismic waves, containing a radiating element, as well as two magnetic cores, central and side, with grooves facing the common air gaps between the magnetic cores, and the side magnetic core is made of two parts, placed on opposite sides of the central magnet one of the magnetic cores is mounted on the radiating element, and the other is made movable, two windings are laid into the slots of one of the magnetic cores, and a control unit, which is characterized by the fact that On the ground, both parts of the side magnetic core are pressed to the central magnetic circuit, in the grooves of which two additional windings are laid, in each pair of windings laid into the grooves facing the common air gaps, one winding is connected to the power source, and a key is connected to the second winding , while the keys of different windings are connected with the possibility of alternately closing the circuits of their windings, 2, A source of transverse seismic waves containing a radiating element, as well as a central and lateral magnetic cores with slots facing the common air gaps between the magnetic cores, the side magnetic core made of two parts placed on opposite sides of the central magnetic circuit, one of the magnetic cores mounted on the radiating the element and the other is movable, a winding is laid in the grooves of each part of the side magnetic circuit, and a control unit that is different in order to increase the intensity impact on the ground, both parts of the lateral magnetic core are pressed to the central magnetic conductor, in the grooves of which an additional winding is connected, connected to a power source, and a key is attached to each winding of the lateral magnetic conductor, with the keys of different windings connected with alternating closing of the windings of their windings. P -j4- e. 3 7 2 W 8} school FIG. 2 five 3 L7 6 j. II J cI I: Sh .3 8 J (70 Z2 22 c / ff. (fjue.ff 25 26 era.6 to .7 J5 33 J2 37 36 o,. / - ... - j 38 Editor N.Gorvat Compiler Raikov Tehred A. Kravchuk Proofreader A. Obruchar. Order 7896/42 Circulation 752 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, ul. Project, 4