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In this paper a general approximate frequency method is intuitively developed for the design of suboptimal controller for the time invariant linear system under the structural constraints, in which the feedback gains of the suboptimal controller is obtained from the optimal controller of the corresponding reference system without structural constraints. The method is simple and robust in computation...
In the present work, a methodology for robust controller design of multivariable systems is presented. This approach allows the designer to specify, in a simple manner, the desired singular values sketch of the return difference operator. In this way, the frequency response of the desired controller is directly obtained. Furthermore, implementation problems are discussed. An example to illustrate...
Parametric optimization is a powerful tool for the selection of favorable values for design variables, which is being used more and more extensively in various engineering disciplines. In linear control system design, unconstrained parametric optimization has been used for at least twenty years, or more precisely, at least since the introduction of the linear-quadratic regulator problem. However,...
The problem of converting existing continuous data control systems into digital control systems is considered. The objective of this paper is to develop a computer-aided method for synthesizing the pulse-transfer function of the digital controller. This is done by matching the frequency response of the digital control system to that of the continuous system with a minimum weighted mean square error...
This paper describes two applications where a digitally controlled programmable ringing generator may be used to provide more efficient use of ringing equipment and office space without sacrificing system reliability. The first application describes a standby ringing system which uses one digitally controlled programmable ringing generator to provide standby capability for a multi-frequency system...
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