SU1291932A1 - Device for determining gain factor of object - Google Patents

Abstract

The invention can be used with random input effects, including real. The aim of the invention is to improve the accuracy and expand the functionality of the device. The input signal is supplied simultaneously to the object under study 1 and multiplication unit 2. The output signals of the object and the multiplication unit are filtered on the filters 3.4 with a time constant TTt are squared on the quadrants 5.6 and (L

Description

129

arrive at the inputs of cyMMaav- a 7. In this case, the quadrated signal of the multiplier circuit is pre-multiplied in block 14 multiplying by the correlation coefficient R (o) between the filter- and 1

signals, calculated on the correlation coefficient measurement unit 13. This improves the accuracy of determining the gain of the object kj, generated at the output of the integrator 8, which integrates the difference of quadrated signals. The invention relates to control devices and can be used in devices designed to obtain information about the gain of objects, mainly of the first order in automatic control systems. as well as in

self-tuning systems with gain adjustment.

The aim of the invention is to improve the accuracy and expand the functionality of the device with random input effects

Figs. 1 and 2 show, respectively, a block diagram of the device and a block diagram of the correlation coefficient measurement block.

DeviceSnig.1-3} contains the explored object 1, the first multiplication unit 2, the first 3 and the second 4 filters. First 5. and second 6 quadrs, first adder 7, integrator 8, averaging unit 9, null authority 10, first key 11, first indicator 12, correlation coefficient measuring unit 13, second multiplication unit 14, dividing unit 15, second adder 16, the second key 17, the second indicator 18. In addition, in FIG. 1, the following designation is introduced: Tm is the output of the first reference source, voltage.

The correlation coefficient measurement unit contains the third multiplication unit 19, the third quadrant 20, the third adder 2, the second integrator 22 (these units are part of the first normalization loop), the second circuit. This includes the fourth multiplication unit.

932

from the output of adder 7. At the same time, using dividing unit 15 and adder 16, the object time constant T, Registration kj, and Td is determined on indicators 12 and 18, respectively, when the mean value of the difference of quadrated signals approaches zero. This moment is fixed with the help of the averaging block 9, the zero-organ 10 and the keys 11, 17. 1 3, п, ф, ly, 3 silt,

the quarter-quadrant, the fourth adder and the third integrator (not shown), the fifth multiplication unit 23 and the second averaging unit 24. Fig. 2 introduces the following notation: y, z, is the first and second inputs of the block, D is the output of the second source of reference voltage, R, (0) is the output of the block,

A device for determining the gain of an object operates as follows.

The random input signal x is fed simultaneously to the object under study 1, FZ-activating in particular in the mode of normal operation, and block 2 multiplication.

Input X and output signals

The objects do not necessarily have to be the input and output signals of the system to which the object is included, respectively. Only the possibility of entering these

signals to the proposed device, whose operation does not affect the operation of the system. The output signals X of object 1 and block 2 of multiplication z are filtered: In identical filters 3

and 4 low frequencies are squared on quadrants 5 and 6 and are fed to the inputs of the adder 7 as the current signal power. In this case, the quad signal of the multiplication unit is multiplied by multiplication unit 14 by the correlation coefficient RV., (O) between the signals y ,

 1 11

and z, from the filter outputs, which is measured by block 13. On the adder 7, the second input of which is inverting, the difference of the current values of the squares of the signals is formed. This difference is integrated by integrator 8 and the voltage at its output will change until the average value of the difference becomes zero, i.e. then, when the variances of the signals at the input of the adder 7 become equal, At this moment, fixed by means of the averaging unit 9 null-organ 10, the key 11 is opened and the output 12 of the integrator 8 kg-y is recorded as determined value of the gain object k,

t

It can be shown that for an object with

W transfer function w (5) -

T „5m

at the input of which a white noise signal acts, the ratio is true

T: Is.X

° R, (01 f

where TO, is the filter time constant, which additionally allows determination of TQ.

This possibility is realized in the proposed device with the help of division block 15 and adder 16: at the output of the division block (at the first input of the adder) the ratio

WITH

J ..

Thus, the measurement of the correlation coefficient between the signals at the top of the filter and the multiplication

on the second (inverting) 35-th signal in the circuit of the intelligent 6V block

RV.V (O)

adder input - the value of T ,. Simultaneously with fixing the value of k by the null organ 10, the key 7 is opened via the control input and on the indicator 18 it is fixed T. The correlation coefficient measurement unit 13 calculates the next value

40

This factor can compensate for the error in the measurement of the gain associated with an incomplete account of the dynamic properties of the object under study.

In addition, due to the measurement of R (o), the functional capabilities of the devices are expanded — simultaneously with the object's gain, its time constant is determined.

.R

.L, °

V,: y,

(2)

where ab.

trait means mean

ib, rms,

read signals -z, and y, respectively. In order to simplify the device and eliminate the operations of dividing and calculating the root-mean-square values of scientific research institutes according to (2), in block 13 two normalization contours are introduced. The input signal in each normalization loop is fed to the input of block 19 multiplying

1932-4

and further to the stroke of the quad 20, at the output of which a signal is formed that is proportional to the power of the input signal. The voltage from the square of the torus is compared in the adder 21 with the reference voltage Dj, applied to the second (inverting) input, equal to the value of the specified dispersion. Their difference is integrated by the integrator to those

W then until the dispersion of the signal at the output of multiplication unit 19 becomes equal to the preset, t, e, D, As a result of multiplying these signals, multiplication and averaging pro) 5 imitation 23 at averaging unit 24 at the output of measuring unit 13 produces the value

..

 K, (ol,

(3)

one

 D is a constant a priori known scale factor;

(The normalized signals at the outputs of blocks 19 multiply,

Thus, measuring the correlation coefficient between signals at the top of the filters and multiplying the quad signal in the block circuit is clever

This factor can compensate for the error in the measurement of the gain associated with an incomplete account of the dynamic properties of the object under study.

In addition, due to the measurement of R (o), the functional capabilities of the devices are expanded — simultaneously with the object's gain, its time constant is determined.

Claims (2)

Invention Formula 1, A device for determining the gain of an object containing a serially connected first filter, first quad, first adder, averaging unit, null organ, first key and first indicator, sequentially connected integrator, first multiplication unit, second filter and second quad, output 5,129 the integrator is connected to the information input of the first key, the input of the first filter and the second 2 input of the first multiplication unit are connected respectively to the output and the input of the object, characterized in that, in order to increase the accuracy and expand the functionality of the device with a random input power; The coefficient of correlation contains the second source of voltage, connected in series the third multiplication unit, the third quadrant, the third adder and the second integration, it contains the source of supports-10 Ratio, connected in series voltage, a second multiplication unit and a series-connected correlation coefficient measurement unit, a division unit, a second adder. the fourth multiplier, the fourth quad, the fourth adder, and the third integrator, connected in series by the fifth multiplication block and this the second key and the second indicator, the control, is the 5th averaging block, the output of which The second input of the second key is connected to the output of the null organ, the second inputs of the division unit and the second adder are connected to the reference voltage source, the first and second inputs of the correlation coefficient measuring unit are connected to the outputs of the first and second filters, respectively. - to the first input of the second multiplication unit connected by the second input with the output of the second quadr, and the output to the second input of the first sum | 2 | Fi.3 VNISHSh Order 261/45 Circulation 864 Random polygons pr-tie, Uzhgorod, ul. Proektna, 4 9326. matora, the output of which is connected to the input of the integrator a. 2. The device according to claim 1, 1 and 2, and that is, that the unit is measurable; For the correlation coefficient, the second reference voltage source, the third multiplier unit, the third quadrant, the third adder, and the second integrator, connected in series, are connected in series the fourth multiplication unit, the fourth quadrant, the fourth adder and the third integrator, the fifth multiply unit and the second averaging unit, sequentially connected, the output of which 0 five is the output of the block, the second inputs of the third and fourth adders are connected to the output of the second reference voltage source, the first inputs of the third and fourth multiplication blocks are connected respectively to the first and second inputs of the block, the second inputs are connected to the outputs of the second and third integrators, respectively the outputs are connected respectively to the first and second inputs of the fifth multiplication unit. , Subscription