The aim of this Master Thesis was to measure and quantify the effect of a continuous visual stimulus on postural stability. The visual stimulus was applied using a Head Mounted Display through which the image of a vertically rotating cylinder was projected. It was hoped that the relationship between the speed of rotation of the cylinder and the body sway of the subject would be quantified through

This thesis describes the results of an investigation into the use of Subspace-based System Identification techniques in the field of Adaptive Control. The project aims included adaption of subspace algorithms for online use, proposal of new algorithms of adaptive control based on these algorithms, and analysis of properties of the proposed systems. The thesis includes reviews of various subspace

In this master theses an existing control system of a DVD player has been modified such that it has become more feasible to implement using limited hardware resources. The discrete controller has already been implemented for evaluation purposes using FPGA technology, and is working well. So far however, low resource consuption has not been a major concern. This is gradually changing though, as mor

The purpose of this thesis was to examine the possibilities to control a process containing a resonance frequency. System identification was made on a process containing a resonance frequency. The identification resulted in a model of the process. Different regulators that were capable of dealing with the resonance frequency were designed for the model. Finally one regulator was implemented and us

In this report we study systems governed by the Saint-Venant shallow water equations interacting with boundary conditions including control. We derive closed form formulas for the open-loop behavior. These formulas rely on first, second and third order approximations which are based on a perturbation that we develop. Properties of these solutions are studied and comparisons with existing non-linea

Many control objectives can be expressed in terms of a criterion function. Generally, explicit solutions to such optimization problem require full knowledge of the plant and disturbances and complete freedom in the complexity of the controller. In practice, the plant and the disturbances are seldom known, and it is often desirable to achieve the best possible performance with a controller of presc

The HCCI engine has potential to replace the spark ignition and compression ignition engines of today. One of the main problems in making the engine commercially attractive is that there are no direct means of controlling the ignition phasing. This thesis attempts to describe a method for system identification of the HCCI process, and development of an effective LQG regulator for the combustion pr

Through the years, cranes have been used extensively for many different tasks. For example construction work, shipbuilding and cargo transportation. One of the tedious tasks that cranes perform is loading and unloading containers. This is a process which can be optimized with the aid of control theory. While moving cargo, the crane operator must make sure that crane motion does not cause the cargo

In this master thesis an equipment for measuring the quality on various grains within the agricultural industry is being investigated. The equipment is manufactured by FOSS Tecator a company situated in the beautiful city of Höganäs in Sweden. The food-analyzing is conducted with so called NIR-spectrometry, a method in which the grain is exposed to light with various wavelengths. The different wav

This thesis investigates what mechanisms that contribute to the interaction between lateral and vertical dynamics in a fourwheeled vehicle. For this a vehicle model was derived. To capture all the essential dynamics of the vehicle, both a horizontal model and a vertical model was used. The interaction between the models turned out to be quite evident, making it possible to use the active suspensio

This master thesis project commissioned by Haldex Brake Products AB (in Landskrona, Sweden), and in association with the Department of Automatic Control, Lund Institute of Technology, deals with the problem of correct wheel speed measurements. Investigation into different types of sensors, Inductive-, Hall Effect- and Magneto-Resistive sensors have been carried out, which are sensors that may be u

A method for generating minimum time yacht routes for short distances while avoiding stationary obstacles and taking into account wave and water current disturbances is sought. The method should be feasible for use in an autopilot type construction. A solution is found using an iterative forumulation of the dynamic programming algorithm on a grided state space and an implementation in ANSI C is pr

In this paper analysis of interconnected dynamical systems are considered. A solid framework for the analysis of the stability of interconnection is given. The results from Fax and Murray (2002) that studies the SISO-case for a constant interconnection matrix are generalized to the MIMO-case where arbitrary interconnection is allowed. The analysis show existence of a separation principle that is v

In this project the control of the gait of a seven degree of freedom biped robot restricted to the sagittal plane is investigated. The gait of the biped is modeled as a hybrid system of four states, corresponding to four relevant phases of the gait. The modeling of the impact between the feet and the ground results in a non-continuous relationship between the coordinate velocities before and after

The work present in this master thesis relates to output feedback adaptive control and observer design of nonlinear systems, and in particular of robot manipulators. A continuous-time velocity observer and a discrete-time adaptive velocity observer for robots are shown, and an observer backstepping controller is also proposed, which can be used together with both the observers. The resulting close

Traditional Ethernet networks are not suitable for real-time communication due to the nondeterministic handling of the network communication. The reason for the nondeterministic behavior is the CSMA/CD access control protocol that is used when the media is shared. The protocol can cause collision in the transmission. If this happens the transmission ceases and after a random amount of time a ret

This master's thesis discusses the real-time issues of the operating system used by the Ericsson Bluetooth stack and the effects of replacing this operating system. The practical part consists of switching the operating system for the Ericsson Bluetooth stack and verifying if it still is operational and fulfils all timing requirements

This report is about the work that we have performed during Autumn 2001 at Botech AB. The purpose with this work was to further develop an existing product named Hubit. Hubit is a compact computer that is running Linux and has limited resources when it comes to memory and storage. Hubit is designed to monitor and collect data from controller systems. The two main objectives that we were about to d

Our problem considered was whether a virtual environment could be used for development of visual servoing control algorithms. We have used a virtual environment for the comparison of several kinds of controllers. The virtual environment is done in Java, and it consists of two industrial robots, IRB 2000 and IRB 6, a camera stereo system with two cameras mounted on the end-effector of the IRB 6, an

The thesis describes the development of a dynamic model of a microturbine system. The thesis is done in close cooperation with Turbec AB and the model is adjusted, tuned and verified against their microturbine T100. The microturbine unit consists of a compressor and a turbine connected on a single shaft to a high-speed generator. Moreover there is a combustion chamber, a recuperator and a gas/wate