Filtyp
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
A description of the implementation of Direct Digital Control systems at TAIAB (Tour & Andersson Industrial Automation AB), and a study of the problems in such work. Including a technical introduction to the TA 6500/6501, decentralized DCC-systems.
A conventional PID-controller is used to investigate some process-models. These are going to be used later to test a self-tuner. Some problems associated to digital PID-algorithms are discussed, and such an algorithm is described and implemented in a computer. A simple way to obtain critical gain and period in a closed-loop situation is described, and used to design a self-tuning PID-controller. F
