SU419851A1 - METHOD OF CONTROL OF DYNAMIC CHARACTERISTICS OF LINEAR CONTROL SYSTEMS - Google Patents

Description

one

The proposed method relates to the automatic control of dynamic systems and can be used in devices for checking various linear dynamic objects.

The known control method consists in supplying a test signal to the input of the system under investigation and comparing the output signal with the reference one during the time of the output signal. The disadvantage of this method is the dependence of the monitoring time on the internal parameters of the monitored system.

In order to reduce the time needed to control the response of the system to the test signal without degrading the accuracy characteristics, the monitored system is brought into the short-term imbalance state at the moment the test signal is delivered, and the output signal of the unstable system is compared with the reference signal during the monitoring time. system.

FIG. 1 shows a functional control scheme; in fig. 2 and 3 - graphics.

The control circuit of the dynamic characteristics of linear systems contains: input source 1, controlled system 2, analyzer 3, test signal generator 4, correction link 5, key 6.

In the initial state, the key 6 is B

left position, in which from source 1 to the input of the monitored system 2 receives an input signal. Analyzer 3 is analyzed and displays the input signal converted by the system.

At the time of monitoring, key 6 is moved to the right position.

At the same time, the input source is disconnected and corrective link 5 is connected in parallel to the monitored system 2, which provides positive feedback and resiliency mode. At the same time, a single pulse test signal is supplied from generator 4, the system goes into an unstable state. Analyzer 3 compares the value of the output converted test signal with the reference parameter n determines the change in the characteristics of the controlled system 2. After that, the key 6 translates

in the left polonsenie.

When the system goes into an unstable state for the time of monitoring its characteristics, the monitoring time can be reduced. Suppose system 2 is described by a first-order transfer function:

W, (p)

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30 where Ki is a static transmission coefficient, TI is a constant of time, which is the desired characteristic, and correction link 5 has a transfer function WZ KZ. It is known that when a single pulse reference signal is fed to the input of a linear system with a transfer function (1), the output signal is described expression h (t) - -e sensitivity of the system to changes in its characteristics - V if liO sensitivity of the new unstable system to the deviation of the monitored parameter - fC, t (K, K, -l) - hel. (3) K,). L -. where h (t) is the output signal of an unstable system during monitoring; Ki is the static transfer coefficient; Kz is the transfer function of the corrective element. As an acceptable output signal level, we choose the value of / g (–GO 0.632- / ,, i.e., at / 1 (0.632 KI, the system’s control stops. Equation in (4) value (5), we get. (K, K, - 11fе -1 0.632. KiKz - 1 This equation after transformation can be represented as ln (0.632-g + 1) d where, the relative control time d / C,./Cj-l. (Graph (a) is shown in FIG. 2) Taking into account the above, the expression for the sensitivity of the newly formed unstable system can be represented in the form 5g. (0.632a + 1), I 1 the sensitivity of the original system in the form ..-. ST. - t Make up the ratio a (t) (0.632a + 1) .e.t, Graph a (t) is shown in Fig. 3, where the values of a were taken from the graph T f (a) of Fig. 2. From a review of this graph, it follows that the sensitivity of the proposed method in 2 9 times higher than the sensitivity of the source system Object of the Invention The method of controlling the dynamic characteristics of linear control systems based on the input of the test signal and comparing the monitoring of the output signal with the reference one, characterized in that, in order to reduce the monitoring time, the controlled system dough serving time signal is brought into a state of short-term instability.

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