| Abstrakt: |
The article considers an automatic control system that implements the combined control principle with invariance with respect to the action of controlled disturbances. When constructing an invariant system of automatic control, the principle of two-channel Petrova B.N. was used. According to this principle, the mathematical model of corrective communication includes mathematical models of the control object on the channels of action of controlled disturbances and the control channel. The dynamic accuracy of the system of automatic control invariant to controlled perturbations depends on the accuracy of these models in particular their parameters. The simulation results confirm that the dynamic accuracy of the system significantly depends on the value of the transmission factor in the mathematical model of the corrective relationship and this dependence is extreme. The transmission factor of the corrective link model is equal to the ratio of the transfer factor of the control object model through the controlled perturbation channel to the transfer factor of the object model over the control channel. Under conditions of parametric uncertainty and non-stationary properties of the control object, the values of these coefficients at the stage of synthesis of the automatic control system can be obtained only approximately and change significantly during operation. Therefore, it is proposed to determine the optimal value of the correction factor of the corrective connection directly during the operation of the control system in real time using an extreme search algorithm with extreme memory. The article gives an example of the structural scheme of such a system. It provides not only the implementation of directly extreme search algorithm, but also special algorithms for automatically turning on and off the search algorithm. The use of these algorithms allows not to keep the search algorithm constantly on and as a result to reduce the stabilization error. Studies of the system were conducted by simulation in the Simulink environment of the MatLab system. The simulation results confirm the efficiency of the developed system and the efficiency of its operation in the conditions of changing the transmission coefficients in the channels of the control object during its operation. When changing the transfer coefficients in the channels of the control object, the system automatically starts the search algorithm and determines the new optimal value of the transmission ratio of the corrective connection, which reduces the stabilization error in the channel of controlled perturbation. [ABSTRACT FROM AUTHOR] |
