SU1264141A1 - Device for measuring parameters of elements of control systems - Google Patents

Abstract

The invention relates to the field of automatic regulation and can be used in research and adjustment of automatic regulation systems. The purpose of the invention is to expand the functionality by making it possible to measure the parameters of not only inertial, but also forcing links of the control systems, which greatly simplifies the measurement process. The device contains adders 1, 2, 3, the first key 8, the integrators 4, 5, the second key 9, the first switch 10, the measuring unit 12, the second switch 11, the first scaling unit 6, the second scaling unit 7. The scaling unit 6 consists of operational an amplifier whose feedback circuit includes a precision resistor, and a measuring multi-turn potentiometer with a scale mechanism connected to the second circuit. The scaling unit 7 consists of an operational amplifier, in the feedback circuit of which a measuring multi-turn F potentiometer with a scale mechanism is included, and in the input circuit - a precision (L resistor. 2 Il.

Description

Sign in 31

7t (& 7. Efff)

1C

O) 4:

This invention relates to automatic regulation and can be used in research and adjustment of automatic regulation systems.

The purpose of the invention is to expand the functionality of the device by making it possible to measure the parameters of the forcing units of the control systems.

The drawing shows a block diagram of the proposed device.

The device contains adders 1, 2 and 3, integrators 4 and 5, the first 6 and second 7 scaling units, the first key 8, the second key 9, the first switch 10, the second switch 11, the measuring unit 12.

The scaling unit 6 consists of an operational amplifier 6, the feedback circuit of which includes a precision resistor R, and the measuring multi-turn potentiometer R6, equipped with a scale mechanism, is included in the input circuit.

The scaling unit 7 consists of an operational amplifier U7, in the feedback circuit of which a measuring multi-turn potentiometer R7 is included, equipped with a scale mechanism, and in the input circuit - a precision resistor R.

The test link 13 is connected with its input to the Input jack and the output to the Input 3 jack. When measuring the parameters of the inertial link, switch 11 is set to the position shown in the drawing, and when measuring the parameters of the forcing link, switch 11 is moved to the opposite position.

The device works as follows.

Assume that the link in question 13 is inertial and its transfer function has the following form:

Kt,

W

(one)

. - AiP + B, P-f 1

where ivyh. - output and input signals

inertial link; Ki is the inertial transmission coefficient;

P is a differentiation operator;

AI, BI is the coefficient of the second and first derivative of the differential equation of the link.

The parameters Ki, AI, Bi are measured in the following sequence.

The keys 8 and 9 are closed, the integrators 4 and 5 are transferred to the scaling mode, to the socket "Input 1 of the device gives a jump-like signal that goes to the first non-inverting inputs of adders 1 and 2. In the position of the switch 11 shown in the drawing, the second and third the inputs of the adder 2 no signals are received. The transfer coefficient of adder 2 at the second input is chosen equal to one, therefore the input jump signal without changing the parameters is fed to the input of the link under study 13. The signal from the output of link 13 through the switch 11 is fed to the input of scaling unit 6, from the output of which it is fed to the second (inverting) adder input 1.

In steady state by rotating the dial mechanism of the potentiometer R6

O change the transfer coefficient Kb of scaling unit 6 until the voltage at the output of adder 1 becomes zero.

After that, the signal from the "Input 1" jack is removed, after the end of the transition process, the integrator 4 is switched to the integration mode in the link under study and the hopping signal is sent to the "Input 1" jack again. In the established mode, the key 8 is opened, and then rotating the scale

0 potentiometer mechanism R7, change the transfer coefficient of the scaling unit 7, the signal from the output of which is fed to the second (inverting) input of the adder 3. The change of the transfer coefficient of the block 7 is performed until

5, the voltage at the output of the adder 3 will not become zero.

The signal from the socket "Input 1 is removed, after the end of the transition process in link 13, the key 8 is closed, the integrator 5 is switched to the integration mode, zero initial conditions are set in both integrators 4 and 5. Then, a jump-like signal is again sent to the “Input 1” jack, after the transition process in link 13 switches 8 and 9 are opened, after which the voltage Us at the output of integrator 5 is measured by measuring unit 12 and readings of the scale mechanisms of potentiometers R 6 and R are read 7

After fixing the voltage Us and the readings of the scale potentiometers R 6 and R 7

0, the input of the measuring unit 12 is connected with the switch 10 to the output of the mass stabilizing unit 7 (the switch is set to the position shown in the drawing) and, by changing the transfer coefficient of the unit 7, achieve that the voltage

Claims (2)

5 the output of block 7 was equal to the previously recorded voltage Us at the output of integrator 5. After that, a new value of the transfer coefficient of block 7 is read out using a scaling mechanism of the potentiometer R 7, which we denote by K The transfer coefficient of the link 13 is equal to (KB) and can be read directly from the scale of measuring potentiometer R 6, the coefficient AI is equal to 5 Kt, BI is equal to K, i.e. the coefficients in the derivatives of the differential equation can be directly read from the scale of the potentiometer R 7 during the measurement. Disabling the switches 8 and 9 of the outputs of the adders 1 and 2 from the inputs of the integrators 4 and 5 reduces the accuracy requirements for setting the transfer coefficients of the scaling blocks 6 and 7, thus simplifying the measurement process compared to a known device. When measuring the parameters of the forcing element, the switch 11 is set in the position opposite to that shown in the drawing. In this position of the switch 11, the signal from the output of the adder 2 is fed to the tested link 13, to the second non-inverting input of the adder 2 and to the input of block 6, the signal from the output of the link 13 is fed to the third inverting input of the adder 2. Let the transfer function of the forcing link 13 be the form of the FF (P) KF (A2P + B2P + 1), where Kf is the transfer coefficient of the forcing link. Taking into account that the transfer coefficient of adder 2 over all inputs is equal to 1, when applied to "Input 1 of the UBX voltage device at the output of the adder.2, the voltage U2 is: U2 UBX + U2-U2 K (A2P4 B2P + 1), whence -r2-A2PHB2R + 1This equation describes the transfer function of the set of elements included between the slot “Input 1 of the device and the input of block 6. The structure of expressions (1) and (2) is the same. Therefore, to determine the parameters of the forcing element, it is sufficient at the considered position of the switch 11 to perform the described operations that were performed when measuring the parameters of the inertial element. Thus, the proposed device has wider functional capabilities than the known ones, since it allows to determine the parameters of not only inertial but also boosting links of the control systems, while the measurement process is simpler by reducing the requirements for the accuracy of setting the transmission factors of the scaling units. Claim device Measuring unit parameters of control systems comprising first and second scaling units, measuring unit, first switch connected by its output to input of measuring unit, first integrator, second integrator connected by its output to first input of first switch, characterized in that In order to expand the functional capabilities due to the possibility of measuring the parameters of the forcing units of the control systems, three adders, two keys and a second switch, the first inputs of the first and second adders are connected to the first input of the device, the output of the first adder is connected to the input of the first key, the output of which is connected to the input of the first integrator, the output of the first integrator is connected to the first input of the third adder, the output of which is connected via the second key with the input of the second integrator, the output of the second adder is connected to the second input of the device, as well as to the first and second inputs of the second switch, the third and fourth inputs of which are connected to the third the device, the first and second outputs of the second switch are connected respectively to the second and third inputs of the second adder, and the third output to the input of the first scaling unit, the output of which is connected to the second input of the first adder and input of the second scaling unit, the output of which is connected to the second input of the third the adder and the second input of the first switch.