A Mathematical model of the thickening function of the final clarifier in the activated sludge process has been studied and expanded with diffusion term. A one dimensional diffusion equation for the concentration of suspended sediments has been used.

We report modifications of a Kalman filter, were the intended application is signal processing in the validation of the control system in a dialysis monitor.

To get a wind power plant with variable speed to deliver maximum power at actual windspeed it is important that the speed of the turbine is correct. This paper describles a mthod how to obtain this, by optimization of a parameter of amplification, KQ, in the electrical control of the power plant. A model of the wind power plant and the optimizing algorithm have been designed and implemented in the

In this report the setting of parameters for the stabilizers in power systems are discussed. This tuning should be done in a systematic way, and the method proposed here is based on optimization. Different problem formulations involving settling times, stabilizer gains, damping and rise time are used.

This thesis is an evaluation of the machine intelligence ideas presented in D.L. Heisermann's book Projects in machine intelligence for your home computer. It also contains ideas concerning improvements and systematization of the problem of selecting one output signal, among several, after an input signal sequence. The main concern of the thesis is how to collect and make use of background kn

The thesis is made within the Department of Automatic Control in Lund. A program "VISIDYN" is written in C for Sun 3/50. The program is to be used in education, but it can also, with a few extensions, be used as a tool by more experienced designers. VISIDYN is a graphics based system for exploring linear dynamic systems. The basic idea is that a linear dynamic system can be examined from

This report is a master thesis in automatic control made at Karlshamn AB. The purpose of this thesis work has been to improve the control of a continuous high-pressure fat splitting process, and thereby eliminate temperature and pressure oscillations. The procedure of work was collection of data, identification, simulation and control design and verification thereof. The improvements consist of

This master thesis is about the regulation of temperature and flow of a steaming fluid when it passes through a heater. There are problems with the present regulation of temperature when the flow rate varies. The study has dealt with two control methods to regulate temperature and flow of the infusion fluid. These methods are different from the method to date. The first method is based on the fa

The purpose of this work was to investigate if the choice of frequency, on a pulse width modulated control signal to a DC motor, might influence the behaviour of the system, as wall as to see how the system reacts in connection with the controlling by means of such a signal. I came to the conclusion that the frequency was not critical seen from the system's point of view, but should be chosen

The report describes a control system for a new mechanical design of a stabilized platform. The platform design is based on rotation of two medges. It has the advantage that mechanical design is very simple. A key difficulty is that the transformation from platform orientation angles to gimbal angles in nonlinear and that it has a singularity. A control system based on local linearization of the t