SU1742850A1 - Device for simulation of lightning discharge - Google Patents

Abstract

The invention relates to scientific and educational models and can be used for studying and demonstrating phenomena accompanying lightning, as well as for testing devices for remote lightning research. The essence of the inventions is that the magnetic field modeling unit contains a number of oscillatory circuits, each of which contains a resistor, capacitance, inductance. Each inductance is designed as a loop antenna mounted on two cross-arms. 3 il.

Description

The invention relates to scientific and educational models and can be used for the study and demonstration of phenomena accompanying lightning, as well as for testing remote sensing devices for lightning.

A device for simulating a lightning discharge is known, containing a series-connected power source, a charging switching element, a lightning channel simulation unit, a switching switching element and a load resistance controlling the output of the lightning channel simulation unit through a threshold element connected to a single-oscillator, one of the outputs which is connected to the control input of the charging switching element, and the other output through the integrating chain is connected to the control input of the discharge switching element.

The aim of the invention is to improve the accuracy of modeling the electromagnetic field by simulating a magnetic component.

The floor modeling unit contains p & Oscillating circuits, each of which includes series-connected resistor, capacitor and inductance, while inductance is made in the form of isolated flat loop antennas, placed one parallel to another.

Figure 1 is a block diagram of a device for modeling a lightning strike; Fig. 2 shows the electric circuits of the magnetic field modeling unit, variants; Fig. 3 shows the inductance of the magnetic field modeling unit.

A device for simulating a lightning strike comprises a series-connected power source 1, a charging switching element 2,

(L

with

V,

B

N: a c

3 channels

17

a lightning channel simulation unit 3, a bit switching element, a lightning magnetic field simulation unit 5 and a load resistance 6. The control input of the unit 3 through the threshold element 7, the single vibrator 8 and the integrating chain 9 is connected to the control input of the discharge switching element A, and the second output of the single vibrator 8 is connected to the control input of the charging switching element 2.

The lightning field simulation unit 5 (Figs2) is formed by a sequence of oscillating circuits, each consisting of a loop antenna 10 with inductance L, a capacitor C 11 and a resistor R 12. The telescopic mast 13 serves as the design basis for the magnetic field simulator 5 (Fig. 3 ), on which the traverse is fixed; Frame antennas 15 made of copper wire are fixed on the ice traverse through the nuts of radio insulators TB (Lower traverse 17 is used for mounting capacitors and resistors and connecting elements This or that electrical circuit. The shape of frame antennas is provided by stretching 18 "Standard contact panels used in telephone networks can be used as a switching panel. To connect a magnetic field simulation unit 5 to a load resistance 6 and a simulation unit A A lightning channel can be used with radio cables PK-50, RC-7, etc. The connection of frame antennas and cables to the rest of the circuit elements can be accomplished either by soldering (swapping) or using mechanical contacts (terminals, clamps etc;).

The selection of the tuning frequency of the circuits is carried out as follows. The DycTii signal at the output of the generating part of the device (at the output of block A, Fig. 1) has a spectral density, in terms of the discrete Fourier transform of the receiving form

 8, ((n, T (4) exp (-ioii, Ti)

Gf) A1

(one)

) - the amplitude of the signal in at times p, T,;

time interval of signal sampling;

T1 C

lf

WITH

five

n is the reference number of the signal amplitude; circular frequency. The current pulse in the block modeling. nor, creating a magnetic field, must have a spectral density

S2 (lfiO "S 5a (p7T) exp (-1ip2Tg) i 1-0 (2)

It can be shown (1J, that S, (ic6) L, (i (0) K and, (ia.

When the condition is fulfilled, K takes the meaning of the proportionality coefficient between the amplitudes of the signals SjCnjTi), S.j. (n2T2) and their phases exp (-iЈOnjTp at frequencies) n, which allows you to select the tuning frequency of the circuits, the amplitude and phase relations between the harmonics.

The device works as follows.

In the initial state, after turning on the power supply 1, the charging switching element 2 is closed,

5, the discharge element h is opened, the charge of the block 3 of the simulation of the lightning channel is going on and the voltage at its output rises. As soon as its value reaches a given level,

0, the threshold element 7 is triggered, the one-shot 8 is triggered, which closes the charging switching element 2 and opens the discharge switching element through the integrating chain 9. The electric current pulse fed to the modeling unit 5 excites all n circuits in which oscillatory process with eigenfrequencies f,: .., Ј and current amplitudes 1e, ..., 1n. These currents, flowing through the frame antennas, induce in space magnetic fields B, ..., VP, which, have their own enamels-1. There and phases, form a total impulse of a magnetic field of the required form and amplitude by a superposition principle.

The invention allows to achieve a higher quality lightning simulation.

five

0

Claims (1)

Invention Formula A device for simulating a lightning strike, containing a power source, the output of which is through a series-connected charging switching element, a ka phage imitation unit. 2 u / J 17 Fig.Z