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A priori knowledge about the process is often available when designing an adaptive controller. This report describes a method to use this knowledge. The first step is to design a nominal controller. In the following steps the nominal controller is modified adaptively. The principal advantage of this method over conventional methods is that the calculations are minimized. In this report the metho
The report describes a system, which can be used to determine the position and orientation of items. The system consists of one video-camera, one framegrabber-board making the image digital and a personal computer. The camera is placed above a lightboard, on which the object lies. This involves that only the two-dimensional projection is studied. A program, written in C, has been developed. This
Fermentation in a 5 l continuous flow reactor with immobilized yeastcells is controlled. Substrate concentration (sucrose) is continuosly measured with an enzyme thermistor. The control variable is flowrate through the reactor. The main controlproblem is a timelag in the measurementsignal. A bilinear processmodel is formulated and used for design of different controllers. Comparison is done betwee
A real-time kernel in Pascal for a Motorola MC 68000 mikroprocessor has been implemented to be used on ASEA's DS101 microcomputer system. An arbitrary number of processes can be executing concurrently. The following primitives for process synchronization are available. 1. Priority, 2. Semaphores, 3. Message passing, 4. Monitors, 5. Waittime, 6. Vectoried interrupt. The processes are realized a
When controlling the drum water level of marine boilers the rolling of the ship may cause problems. The drum water level gets a sinusoidal disturbance, which causes a disturbance of the feed water control valve. This disturbance may proceed through the feed water pump to other steam consumers. The rolling inflates other boiler parameters too. It will be shown that stability problems may appear if
