Multi Criterion Regulation

The literature on modern Theory of Regulation contains numerous publications concerned with the optimization based design of regulators based on specific criteria. However, a realistic design problem would rather contain a range of specifications. Hence, optimization based methods are to a large extent inapplicable, until it has been made possible to impose multiple specifications on the same control problem. Many control problems may be formulated with constraints on sensitivity functions and a number of results have been achieved for this kind of problems. The results within this area has in particular been applied in connection with active damping of rolling of ships by steering the rudder.