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 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

For efficient firing in sloping grate bark ovens, it is important to control the ash line position on the grate. Here, the problem of detecting the ash line with an image processing system is treated. The presentation of trend curves to the operator is of special interest. The trend curves shall indicate how the ash line position changes with time, and in that way improve the manual control of the

The subject of this master thesis was originally proposed by the electronic company Telsand Electronics in Arlöv. The purpose was to examine the possibilities to implement digital controllers on a one board computer based on Texas Instrument microprocessor TMS 9995. We have implemented a certain type of PID-regulator and designed both hardware and software solutions. Because of lack of time, we ha

Following report describes a computerized measuring system based on the Swedish micro-computer ABC 80. The system was able to handle up to 30 measuring channels. Received measuring data was stored on a diskette. The control of the system was carried out by a program in the computer. For analysis of the result, a few programs were developed. The system was applied on a margarine-making process and

In this report, the dynamics of an aertor of an activated sludge process is studied. Two control strategies for the dissolved oxygen concentration are tested. One contains either a PI-controller or an on-off controller, the other a self-tuning controller. There are two key-parameters in the system, KLa, the total oxygen transfer rate, and OUR, the oxygen uptake rate of the microorganisms in the a