SYNTHESIS OF CONTROL SYSTEM OF ENERGY CONSUMING TECHNOLOGICAL PROCESS BASED ON D PARTITIONING

The work is aimed at solving the applied problem of developing an automatic control system for the evaporator using the principle of D-partition. Since there is always uncertainty in real problems, the solution of the problem of synthesis of the control system is reduced to the synthesis of a robust regulator. As a result, the area of robust stability of the object was obtained and an array of PI controller settings was formed, which ensures the stability of the object in the entire range of uncertainty.

Robustness Analysis of an Electrohydraulic Steering Control System Based on the Estimated Uncertainty Model

The impossibility of replacing hydraulic drives with other type drives in heavy duty machinery is the main reason for the development of a system for controlling hydraulic power steering. Moreover, the need for remote automatic control of the steering in specific types of mobile machinery leads to significant scientific interest in the design of embedded systems for controlling electro-hydraulic steering units. This article introduces an approach, which has been developed by authors, for robust stability and robust performance analysis of two embedded systems for controlling electro-hydraulic power steering in mobile machinery. It is based on the suggested new more realistic “black box” SIMO model with output multiplicative uncertainty. The uncertainty is obtained by parameters confidence interval and Gauss approximation formula. The embedded control systems used a linear-quadratic Gaussian (LQG) controller and H∞ controller. The synthesis of the controllers was performed on the basis of a nominal part of an uncertainty model. Robust stability and robust performance analyses were performed in the framework of a so-called structured singular value, μ. The obtained theoretical results were experimentally approved by real experiments with both of the developed control systems, which were physically realized as a laboratory test rig.