Abstract
A controller design is presented for a cryogenic windtunnel. The nonlinear multi-input multi-output model with state dependent time delays in input variables is first simplified: For the simplified model a suitable choice of controller structure is straightforward. Values for the controller coefficients are first obtained by pole assignment and are then taken as initial values for several controller designs using optimization of a vector performance index. The problem of obtaining satisfactory performance with a simplest possible controller structure (e.g. using fixed gain PI-control) is investigated. All control designs are evaluated by nonlinear simulations.
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