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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

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 sam

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 measurem

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 magni

En social och ekologisk hållbar trafikplanering innebär inte enbart att utveckla hållbara färdmedel, utan även att optimera alla typer av färdmedel för att minimera dess miljöpåverkan. I dagens samhälle utvecklas ständigt nya åtgärder som främjar den hållbara trafikplaneringen. En nyutvecklad teknik, så kallad fordonsdata återfinns i ett urval nyare bilmärken, där RSI (Road Surface Information) är

Abstract har tillfälligt dolts av sekretesskäl.The abstract has been temporarily removed due to confidentiality reasons.

Syftet med uppsatsen var att utforska den levda erfarenheten av och reaktionerna på mikroaggressioner hos personer som identifierar sig som homosexuella, bisexuella, transpersoner, queera och andra minoritetsgrupper som bryter mot normer som rör kön, sexualitet eller relationer (hbtq+-personer). Mikroaggressioner är en subtil och ofta omedveten form av diskriminering som förmedlar nedsättande buds

Clusters, agglomerations of companies in related industries, are a phenomenon which have been widely accepted to increase the productivity of its constituent companies. Many scholars hold the view that companies should utilise these favourable conditions and interact with clusters. Nevertheless, there exists limited literature on the topic how companies can interact with clusters outside of their

Plastic waste has brought a severe pollution problem that demands immediate attention. Promoted by policymakers, academia, and corporations alike, the circular economy model presents a viable path to sustainable development. Likewise, the emergence of disruptive technologies promises a profound and imminent socio-technical transformation. This thesis qualitatively explores the role, barriers, an

This work reports the research and findings concerning the processes of groundwater flow and distribution to lake Bolmen in the Småland region, Sweden. The watershed of Bolmen is of high interest since it provides water for drinking and energy purposes, representing a resource of notable importance for the society of southern Sweden. Among the main objectives there is the estimation of the water b