Рассматриваются некоторые аспекты проблемы согласно-параллельной коррекции (СПК) систем автоматического регулирования. Данный тип коррекции слабо изучался в рамках классической теории автоматического регулирования и практически не затрагивается в современных исследованиях. Предметом исследований настоящей работы является естественный вопрос - может ли быть полезен данный тип коррекции разработчикам САР? В работе рассматриваются три способа применения СПК: компенсация передаточных полюсов канала управления, управление его передаточными нулями, коррекция амплитудно-фазовых характеристик разомкнутой системы. Итогом СПК является эффект желаемого изменения передаточных и частотных характеристик канала управления, недостижимый в рамках классических методов коррекции и весьма полезный для решения ряда задач регулирования.
The functional purpose of the correcting links in the structure of the automatic regulation systems (ARS) is improvement of the precision and dynamic quality of the regulation processes. In the classical methods of ARS design two types of the correcting links are used: of the sequential and parallel feedback. At the same time there is one more type of correction. It has been insufficiently studied within the framework of the classical automatic regulation theory and practically ignored in the modern researches. It is a parallel feedforward correction (PFC). A logical question appears concerning the usefulness of the given type of correction for the developers of ARS. This question is exactly the subject of the given paper. Three methods of PFC application are considered: compensation of the transfer poles of the control channel, its control by the transfer zeroes, and correction of the amplitude-phase characteristics of an open loop. The method of compensation of the transfer poles of an object reduces the order of the transfer functions of the control channel, and, as a result, the dimension of the regulation problem to be solved is reduced. Its auxiliary effect is analyzed, that is formation of a non-control and non-observed subsystem in ARS structure, the spectrum of which coincides with that of the compensated poles. "The bad" transfer zeroes of an object are problematical for a great many methods of synthesis of ARS. The right zeroes, and also the left zeroes, which are in the immediate proximity to the imaginary axis, are among them. By means of PFC it is possible to change purposefully the transfer zeroes and even to exclude them from the corrected control channel. Correction of the frequency characteristics of the direct chain of PFC is realized with a view to ensure the desired phase and amplitude stability for the closed system. The authors demonstrate good prospects of its use in the regulation tasks with big amplification factor. The conducted researches demonstrate wide functional potentials of the considered mechanism of PFC and expediency of its use alongside with the classical methods of correction. In this connection the question about development of a methodology of PFC and its inclusion in the modern engineering instrument of ARS design is quite appropriate.
The authors declare that there are no conflicts of interest present.