SU1316014A1 - Device for modelling water flow along cable of tugged oceanographic system - Google Patents

Abstract

The invention relates to analog computing and can be used to simulate the flow of water over elements of towed oceanographic systems. The purpose of the invention is to improve the accuracy and productivity of the device. The device includes an external simulation unit 1, a flexible metal loop 2, dielectric balls 4, dielectric strips 5.6, dielectric blocks 7.8, strands 9.10, weights 11.12, 13.14, dielectric strips 15, sliders 17.18, strands 19.20, dielectric rings 21.22, rtikalnuyu rail 23, brackets 24, the sliders 25, 26, pen 27, the block of the magnetic field simulation of characteristics of the cable, a metal ring, inductors, recording unit, an alternating voltage generator Genie inventions allows to increase the accuracy and performance of the device, 3 yl. about 9 (L 00 and 26

Description

1P

The invention relates to analog computing and can be used to simulate the flow of elements of towed oceanographic systems.

The aim of the invention is to improve the accuracy and performance in the study of the shape of the cable loop and its magnetic field characteristics. Figure 1 presents the block diagram of the device; 2 shows the construction of block 1; on fig.Z - loop cable towed oceanographic system.

The device comprises an external stimulation unit 1, consisting of a flexible metal loop 2 and a dielectric frame 3, dielectric balls 4, dielectric blocks 7 and 8, threads 9 and 10, loads 11-14, dielectric strip 15, sliders 16-18, threads 19 and 20, dielectric rings 21 and 22, vertical rail 23, bracket 24, sliders 25 and 26, pencil 27, unit 2 for simulating the characteristics of a magnetic field cable, consisting of a metal ring 29 and an inductive sensor made in the form of an inductor 30 measuring in do; a sensor in the form of an inductor coil 31, a registration unit 32, an alternating voltage generator 33.

The device works as follows.

Before proceeding to work, the linear and force scales of modeling are established, consider the equations of the catenary K1 Willow BOC (l) and the catenary line Luc (2) with the origin at the points O (FIG. 3 and 1):

I /, And G -

p (ch --- - 1); ,)

(one)

(2)

where T is the tension along the BOC towed cable; g is the linear hydrodynamic resistance of the dragged cable streamlined by the fluid flow at a speed and angle of 90 °; X and Y - coordinates of the towed BOC cable, when towing at speed U, takes the shape of a catenary curve (1) with the origin at the point O (In this case, the weight of the towed cable - iodine is neglected);

t - burned ontalt.na on the tension component of the chain of HOC, formed by a flexible wire with weights located on it; - the linear weight of the chain; x and y are the coordinates of the chain that takes the form of a chain line with the origin at point 0 in a force of gravity field.

From expressions (1) and (2) it follows that the shape of the towed BOC cable is similar to the shape of the chain of BOC, if the conditions

five

0

five

0

five

0 5

tx t t "G

7 g g

(3)

with)

(five)

X y f 1

X Y L t where P and L are the length of the boc chain and the towed BOC cable; m is the linear scale.

It should be noted that condition (3) is also observed for the forces applied to the cable being towed, for example, a diverting device:

Bi Г „BI - Г

Р, - г Рг гIn addition, this is true for the AB and AU cable segments, i.e. in the fluid flow, they also take the form of a catenary curve (1) and they are also modulated by the chains ab and ac,

In accordance with the selected linear scale ml, L, take flexible wire 2 with weights 4 with any linear mass (in this case, dielectric weights can be strung or tied). Then, according to (3) and (3), the weight of the weights p is calculated, and p according to given values of T, g, P, P, f. Assemblies of the device are assembled according to FIGS. 1 and 2. Rings 21 and 22, weights p and p are suspended - Rising elements (for example, hooks). Since the weights mimic the horizontal component of the forces P of the diverting devices, moving the slide blocks 17 and 18 but to the guide posts 5 and 6 with blocks 7 and 8, strands 9 and 10 are arranged horizontally. In this case, the flexible wire 2 (aboc) with weights 4 takes the form of an towed, looped cable AVOS.

To determine the characteristics of the magnetic field of the resulting cable loop, they power the speaker wire 2 with the alternating current i from the source 33 of the alternating voltage (for example, a sound cable),

313

The inductive pickup sensor 30 at some distance from the metal ring 29 is mounted using the guide 23 of the measuring induction sensor 31 in the measurement plane, spaced from the wire loop plane 2 at a predetermined distance, and by moving the slide 16 (to the left - to the right) according to the bar 15, a point is found at which, according to the compensation unit 32, the magnetic field strength given by the sensor 30 is observed. This point is marked with a pencil 27 on graph paper, which is previously nano-t on the base of the frame 3,

Then, using the sliders 25 and 26, shift the bar 15 (up or down) by some distance and again by moving (left-right) the slide 16, find the point where the field is observed. This point is marked with a pencil and a graph paper, this is done several times. Since the driving sensor 30 remains for a month: those, i.e. Since the magnitude of the strength of the driving field remains constant, then the marked points correspond to the isolines of the intensity of the magnetic field. By connecting the marked points with a smooth curve, one obtains the isoline of the magnetic field of the cable loop.

The transition from the magnetic field strength measured on the cable loop model to the magnetic field value of the cable loop field is carried out in accordance with the modeling rule: the magnetic fields of such contours at the corresponding points are directly proportional to the currents supplying the contours and inverse to their linear dimensions, those.

HI

il. I

(6)

ii t

Hi TI L ii m 45 de H, - the value of the field loop loop

AVOS cable; N. - the value of the sex pattern of the loop

ABO cable; i, - the value of current in the field - 50

cable loop;

2 current value in the cable loop model; m is the linear scale.

Since measurements are known H2, j i z are also known

current I,

that

HI - g

4 1 / t.

160

with fO f5

20 . -thirty

35 x 40 m

45 and

50

1D4

Claims (1)

Invention Formula A device for simulating the water flow around a cable of a towed oceanographic system, comprising an external impact modeling unit consisting of a flexible metal loop and a dielectric frame, to the vertical posts of which a first and second dielectric plates are attached, parallel to the bottom rack of the dielectric frame there is a third dielectric plate on which The first U-shaped dielectric slider, equipped with a vertical rail, bends a metal loop inside the g and an electric frame, a unit for simulating the characteristics of a magnetic field of a cable consisting of an electromagnetically connected metal ring and an inductive sensor in the form of an inductance coil, the first and second terminals of which are connected respectively to the first input of the registration unit and to the first output of the measuring induction sensor in the form of an inductance coil connected by a second output to a second input of a registration unit and electromagnetically connected to a flexible metal loop, The first terminal of which is connected to the first output terminal of the alternating voltage generator, the second output terminal of which is connected via a metal ring to the second output of a flexible metal loop, the inductor of the measuring induction sensor is located on the end of the vertical rail, in order to improve the accuracy flexible metal ring evenly placed dielectric balls, on opposite sides of the flexible metal loop are fixed two dielectric rings, the first the second dielectric strips are provided with second and third U-shaped dielectric sliders to which dielectric blocks are attached to the brackets, the first and second weights of the first and third weights are attached to the first and second dielectric rings on the first and second threads. the end of which is through the first dielectric5131 the primary unit is connected to the third load, the first end of the fourth thread is attached to the second dielectric ring, the second end of which through the second dielectric block is connected to the fourth load, the first and second ends of the flexible metal 60146 the loops are fixed in the upper part of the dielectric frame; the ends of the third dielectric bar are fixed in the third and fourth P-shaped sliders located respectively on the first and second dielectric bars. JO Pui i Phi1 J Compiled by V.Rybin Editor L. Langazo Tehred M.Hodanich 2366/53 Circulation 672 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader M. Demchik