This paper deals with optimal long-distance steering of large vessels. The purpose of the paper is to design a regulator, that keeps a vessel, when affected by different disturbances, on an economical course. The vessel is supposed to have constant speed forward and therefore the only steering variable is the rudder angle. From a mathematical model of the vessel, the equations of motion are calcul

Different models of the solids-liquid separation in an activated sludge system are presented. The influence from the solids-liquid separator on the biological activities in the aeration tank is examined. The dynamics of the different separator models is discussed. Two simple control strategies for sludge removal has been tried out.

This treatise gives constructing principles, hardware ones as well as software ones, for an operator's console adapted to the process computer and DDC software package of the Division of Automatic Control. The console is implemented with a micro computer trademark TRANSINTRO with CPU INTEL 8008. The display unit consists of four registers: "node identity", "parameter identity&qu

The master thesis intends to investigate the advantages and disadvantages with the simulation language SIMSCRIPT. The programming language was learned from manual and books about SIMSCRIPT (see references). Two models were made ato describe two different systems, one fictive and the other already existing. The first model simulates the work at an assembly line. The model illustrates the use of the

When regulating a process, the system being sampled, one can often regard the output as white noise. Often occuring is a wish to obtain an output as close to an optimal value as possible. At the same time, however, you demand this optimal value not to be exceeded too often. Thus, when you decide your set-point you have to consider the value of the standard deviation of the white noise. If the stan

A method of resign for multivariable systems is presented. It is used in an application design of a controller for an advanced aircraft. The main design criteria, singular values plot, is discussed in detail. A must for the use of the method is that computer assistance is available. Two different interactive program packages allowing LQG-design are presented and somewhat compared.

The goal of this work is to build a dynamic model for a steam power plant, using frequency and step-response analysis and use it for construction of an automatic controlling system. The model is to simulate all the variables necessary for controlling with reasonable accuracy. By using measurements at a power plant in x 14rebro, the transfer functions for the most important steam pressures and pro