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The report discusses mathematical modeling of thermal components, such as heat exchangers and control valves. A flexible model library for simulation has been developed. The object-oriented and equation-based modeling language Omola is used to describe the components in mathematical terms. The library of models can be used to build models of more complex thermal systems, such as heat exchanger uni
When converting electric power from AC to DC, a 12-pulse converter is often used. Unfortunately, the converter creates harmonics superimposed on the DC voltage. These are removed by filters. A passive filter is normally used, but active filters may be added for improved performance. However, the drift in component values due to fluctuations in temperature and the change in load, makes it difficult
This master thesis describes a graduation work that was carried out on a heating plant owned by Sydbränsle AB. It describes the resulting control system, the way to final resolutions and conclusions. The goal was the usage of a PC as an operator interface to simplify the supervising and controlling of the heating plant. Man/machine interface would be simplified extensibly so that all the untrained
This thesis treats several problems in control of piecewise linear systems. A parameter estimation algorithm for piecewise linear systems is presented. Some problems with the algorithm are discussed and suggestions with regard to the input requirements are made in order to overcome the problems encountered. A self-tuning regulator for piecewise linear systems is presented, using pole placement des
This report investigates the possibility of simulating the cruising of a missile by using the program Matlab and SimuLink. Matlab is a mathematical package with a number of application areas, for instance statistics, signalling and control theory. SimuLink is an easy to-use program package for building models and for simulation of both linear and non-linear technical control systems. The report d
