TL;DRAbstract
Systems with more than one control loop are known as multi-input multi-output (MIMO) or multivariable systems. The field of multivariable control is very wide and an introductory article of this nature cannot possibly cover all aspects of the topic. This chapter attempts to draw attention to the consequences of interacting control loops and the utility of two relatively simple techniques for alleviating these problems, viz. dominant interaction control systems design using relative gain analyses and the use of decoupling networks to provide for non-interacting multivariable control. Finally, although the examples used have been drawn from the process industries, it should be recognized that the techniques described are applicable to multivariable systems in general.
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Systems with more than one control loop are known as multi-input multi-output (MIMO) or multivariable systems. The field of multivariable control is very wide and an introductory article of this nature cannot possibly cover all aspects of the topic. This chapter attempts to draw attention to the consequences of interacting control loops and the utility of two relatively simple techniques for alleviating these problems, viz. dominant interaction control systems design using relative gain analyses and the use of decoupling networks to provide for non-interacting multivariable control. Finally, although the examples used have been drawn from the process industries, it should be recognized that the techniques described are applicable to multivariable systems in general.
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