Showing papers by "Edward J. Davison published in 1980"
01 Dec 1980
TL;DR: The problem of designing realistic multivariable controllers to solve the servomechanism problem is considered and the controllers obtained have been highly competitive (i.e. always superior) with controllers obtained by alternate design methods.
Abstract: The problem of designing realistic multivariable controllers to solve the servomechanism problem is considered in this paper. Specifically it is desired to find a controller for a plant to solve the robust servomechanism problem, so that closed loop stability and asymptotic regulation occur, and also so that other desirable properties of the controlled system, such as fast response, low-interaction, integrity, tolerance to plant variations, etc. occur. The method of design is based on using state space methods via a two-state process: (1) using theory, determine the existence of a solution and control structure required to solve the problem, (2) using nonlinear progranming methods, determine the unknown controller parameters so as to minimize a performance index for the system subject to certain constraint requirements. Numerous examples, varying from a single-input/single-output to a four-input/four-output system, are given to illustrate the design method, and the results obtained are compared with the results obtained by using other alternate design methods. In all cases, the controllers obtained have been highly competitive (i.e. always superior) with controllers obtained by alternate design methods.
245 citations
TL;DR: In this article, the synthesis of a practical controller for a commercial heat exchanger using tuning regulators is described, where the problem is to find a robust feedback-feedforward controller so that the output temperature and output flow of the heat exchange are satisfactorily regulated, independent of any variations in input flow, input temperature, etc.
Abstract: The synthesis of a practical controller for a commercial heat exchanger using tuning regulators [17] is described in this paper. The problem considered is to find a robust feedback-feedforward controller so that the output temperature and output flow of the heat exchanger are satisfactorily regulated, independent of any variations in input flow, input temperature, etc. of the process. In this control design problem, it is assumed that a mathematical model of the heat exchanger is not available, i.e., the process which is to be regulated is unknown. In this case, on using the approach outlined in [17], some simple "off-line" experiments are applied to the heat exchanger, and from the results of these experiments it is determined that a solution to the problem exists; a controller is then obtained using the results of these experiments and by applying some simple "on-line" tuning experiments. This paper describes these experiments, the results of performing the on-line tuning, and the final control configuration obtained. It is found that the new controller obtained performs extremely satisfactorily and is superior to the "conventional" controller for the process.
27 citations
2 citations