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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
In this report heat quantity measuring and temperature regulation of smaller heating networks have been studied. At lower flows, as well as at lower difference temperatures, the accuracy of the measurement is very low. Today's control of a heating plant endeavour to let the temperature of the water into the heating network follow the heat requirement. This control strategy leads to small heat
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
This is a presentation of automatic control theory in combination with an introduction to the digital controller Asea Novatune. The work is done as part of a master degree in science at Lund Institute of Technology, Department of Automatic Control, with Asea Innovation, Västerås, as sponsoring organization. The presentation is to be used within Asea Innovation for education. The presentation has
