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Interlinked control loops with asynchronous sampling can give rise to a time varying time delay which varies irregularly. Here we examine ways to model these effects for an arbitary number of control loops, and to build up a probability density function, and current delay, before implementing a controller.
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The dual control problem for an integrator with time-varying gain is reviewed. The neuro-dynamic programming technique of approximate policy iteration is explained. It is shown how a version of this technique, which employs a Gaussian radial basis function network, can be used to calculate a good sub-optimal dual controller for the integrator. This controller performs much better than the certaint
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A model for a CSTF with a cell recycle unit was identified in collaboration with Nestlé. Simulations of the model showed that it is possible to control the system in order to concentrate the biomass to 10-13 g/l with an overall dilution rate set to 1 1/h. The bacterium studied was Lactobacillus johnsonii LJ1, which produces lactic acid from lactose. The filter in the cell recycle unit was a cross-
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The task of this masters thesis is to investigate the properties of Natural Field Orientation, NFO, a new patented method for controlling the asynchronous motor. The intention is to see whether NFO would make it possible to, in the future, replace the expensive hydraulic motors that are being used in CelsiusTech Electronics' radar directors today with inexpensive hydraulic motors that are bein