In order to get a system with a very low damping, a positionservo has been provided with an inertia disc driven by spring transmission. The servo will therefore drive a mechanical oscillation unit. The motor is simulated as armature controlled by feeding back the tachogenerator signal to the existing motor which is field controlled. In a former examination work at the institution the transfer func

An algorithm has been developed for decomposing a linear dynamic system into subsystems, building up a multilevel control system. The theory for the decomposition is based upon graph theory. The graph is constructed from the coefficient matrix. In order to make the decomposition in a systematic way, a matrix, called the reachability matrix, which is based upon the graph, is introduced.

In this paper we discuss the problem of finding a suitable filter used as prefilter at digital Kalman filtering. The process is described by a stochastic state model. Two different filters are analyzed: a low-pass filter and a mean value filter. Especially we examine optimal choices of the parameters of the filters i.e. optimal integration area in the mean value filter and optimal time constant in

Temperature dynamics for a building heated by hot-water radiators are studied in this work. The emphasis has been put on deducting an equation for calculating radiator temperatures and temperature dynamics out of given datas on the construction of the heating system. Different models for approximation of radiators are compared and the heating effect as a nonlinear function of the temperature is e

This report presents measuring and identifications of the process in papermachine PM4 Gruvöns Bruk, Grums. Our intention was, except the measuring itself, to improve, if possible, the system model now used for process control with an IBM 1710 system. The measurings were accomplished during the last two weeks of February 1969, and included six series of about 2000 samples each using a sampling in

In this work we have discussed some alternatives to digitize the signals from different measurement devices. As a result of the work we have got a prototype for a digital interface as well as systems for digital representation of signals in temperature and pressure systems. The report is divided into two parts, temperature and pressure measurements. In this section of temperature measurements we

In this report multi-input systems are treated by considering the input vector consist of two elements, its magnitude which is a scalar, and a unit vector representing the direction of the control vector (i.e. the ratio between the control signals) in the linear space formed by the control vectors (III:1). A formalism for representing multi-variable systems in matrix-form, where the magnitude of