SU1201800A1 - Meter of dynamic parameters - Google Patents

Abstract

A DYNAMIC PARAMETER MEASURER containing a task block connected by an output to the input of the object being checked, the output of which is connected to the input of the imaging unit, a pulse generator, the first AND element, the first trigger, the first counter, the display unit, the analog-digital converter and the reversible counter, characterized by that, in order to measure the measurement accuracy, a second trigger, a frequency multiplier, a second and third And elements, a second and third counters, an I-IZ element, and a functional converter were introduced, the output being The first is connected to the first input of the first counter. And to the first input of the frequency multiplier, the second input of which is connected to the output of the pulse generator, the input of the first trigger, the first input of the first element AND, the first input of the third element AND and the first input of CESO AC AN 13 0. -:: 13 TtAi .. -.-- THE UNION OF THE AND-OR element house, the second input of which is connected to the first output of the first counter and the first input of the second AND element connected by the second input to the output of the second trigger, and the input of the second counter, the output of which is connected h Through the functional converter to the input of the analog-digital converter, the third input of the AND-OR element is connected to the second output of the first counter and the second input of the third element AND, the output of which is connected via the third counter to the first input of the display unit connected by the S second input to the analog-digital output converter, the output of the first (L trigger connected to the fourth input of the element AND-OR, the output of which is connected to the first input of the reversible counter connected to the output of the first element of the second AND Its input is connected to the third output of the first counter, the output to the third output of the first counter, the code of the task block is connected to the second input of the first counter and the first input of the second trigger connected to the second input of the reversible counter, and the output of the frequency multiplier is connected to the third input the second element I.

Description

one

. The invention relates to automation and can be used to determine the coefficients of the transfer functions of automatic control systems.

The purpose of the invention is to improve the measurement accuracy.

FIG. 1 is a block diagram of a meter; figure 2 - temporary diagrams of the operation of the device.

The meter contains a block 1 of the task, the object to be checked 2, the driver 3, the generator 4 pulses, the first element 5, the first trigger 6, the first counter 7, the block 8 of the display, the analog-to-digital converter (ADC) 9, the reversible counter 10, the second trigger II, the multiplier 12 frequency, the second and third elements And 13 and 14, three and three counters 15 and 16, the element AND-OR 17, the functional Converter 18.

The device works as follows.

The relative attenuation coefficient for a single action on a test object is defined as the cosine of the phase angle between the free oscillation curve and the reference harmonic oscillation of a fixed frequency.

, U, (o., |,

where Tr is the phase shift between the free oscillation of the system with a period

21G T - and reference oscillation X

(J

 And SihbJt L Sih - t; uJ - frequency

free vibrations; A - constant When and 1 the value of this voltage is numerically equal to the value of the relative attenuation coefficient

Thus, the task is reduced to determining the cosine value of the angle corresponding to the phase shift measured from the transient curve.

The impulse of the beginning of the measurement comes from block 1 of the task to the object under test 2, forming a single disturbing action. At the same time, the same impulse trigger 1 overturns into one state, and counter 7 permits the passage of pulses from the output of generator 4 to the summing input of the reversing counter 10.

018002

The reaction of the test object 2 is fed to the driver 3, which produces a short pulse when the output signal passes.

5 from the output of the inspected object 2

through zero. After the first passage of the output signal through zero, the counter 7 closes the element AND 5 and permits the passage of pulses with,

10 output of the generator 4 through the element And 14 to the input of the counter 16. At the same time, the pulses from the output of the trigger 6 through the element AND-OR 17 are fed to the subtractive input of the reversing

15 of the counter 10. By the time of the second passage through zero of the output signal of the object being inspected, the reversing counter 10 will be recorded corresponding to the phase

20 shift / f at the frequency of natural oscillations of the inspected object. At the same time in the counter 16 will be recorded a number corresponding to the half-period of natural oscillations.

25 Thereafter, to the subtractive input of the reversible counter 10 via ele. The mentor AND-OR 17 will start receiving impulses with a generator frequency of 4, reducing the contents of the reverse

30 counter 10 At the same time, the pulses from the output of multiplier 12 through element I 13 are fed to the input of counter 15 until the contents of reversing counter 10 are zero, after which the output is set to low level, tilting trigger 11 to zero state, closing the element And 13. The multiplication factor of the multiplier 12. is chosen in such a way as to ensure the specified measurement accuracy, if we choose it equal to 360, then our output will be a pulse sequence with frequency I equal to

f 360.f.

where f is the natural frequency of the object. At the same time, in the counter 15 a number will be recorded corresponding to the angle Yp in degrees. The digital code from the output of the counter 15 55 is fed to the functional input. converter 18, which converts it to a static analog signal, the amplitude of which varies.

according to the cosine law, depending on the input number. As a functional converter, it is possible, for example, to use the K505REZ-0068 microcircuit,

12018004

designed for the implementation of such functions.

Further, the amplitude of the analog signal is measured by the A / D converter 9 and is displayed by the display unit 8.

Claims (1)

DYNAMIC PARAMETER MEASUREMENT, comprising a reference unit, connected by an output to the input of the object under test, the output of which is connected to the input of the former, pulse generator, the first element ^! And, the first trigger, the first counter, an indication unit, an analog-to-digital converter and a reversible counter, characterized in that, in order to increase the measurement accuracy, a second trigger, a frequency multiplier, the second and third elements And, the second and third counters, an AND-OR element and a functional converter, the output of the driver being connected to the first input of the first counter. and to the first input of the frequency multiplier, the second input of which is connected to the output of the pulse generator, the input of the first trigger, the first input of the first element And, the first input of the third AND element and the first input of the AND-OR element, the second input to-. which is connected to the first output of the first counter and the first input of the second AND element connected by the second input to the output of the second trigger, and the output to the input of the second counter, the output of which is connected through the functional converter to the input of the analog-to-digital converter, the third input of the AND-OR element is connected with the second output of the first counter and the second input of the third AND element, the output of which is connected through the third counter to the first input of the display unit connected to the second input with an analog-to-digital output For, the output of the first trigger is connected to the fourth input of the AND-OR element, the output of which is connected to the first input of the reverse counter connected by the second input to the output of the first AND element, the second input of which is connected to the third output of the first counter, the output - with the third output of the first counter, the output of the job block is connected to the second input of the first counter and the first input of the second trigger connected by the second input to the output of the reverse counter, and the output of the frequency multiplier is connected to the third input of the second element