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When building a telescope, importance does not only lie on the optical performance. Keeping the entire structure stable is also of great importance. In the case of the Euro50, the secondary mirror cell will be located some 60 m above ground level, exposed of wind speeds up to 15 m/s. This makes the stabilization of the mirror cell to a dicult problem. However, it has to be solved.
The main goa
This work treats a specific multi-vehicle control case, namely six vehicles on the Multi-Vehicle Wireless Testbed (MTWT), wich is an arena at Caltech, California, built for doing experiments on small vehicles. A model is set up and a controller is found through simulations that stabilizes the system. Stability is proven through a Nyquist-like creterion and by looking at the poles for the closed lo
This Master Thesis is dealing with a vision system for analysing the quality of a fabric that is used in the paper industry when the water is to be removed from the pulp. When the loom is stopped by any reason the fabric tends to slide a bit in one direction or the other which makes the density rise or decline and make a mark in the fabric. To avoid this the weaver has to adjust the loom before re
This thesis investigates the influence of sleep deprivation on the human's postural control and conceptions of adaptation. Seventeen subjects were investigated with posturography after 24 h and 36 h of sleep deprivation, and a control posturography trial was performed either one week before or one week after the sleep deprivation trials. Stabilizing torques and forces were recorded by a force
Abstract The topic of this master thesis is Portable Robot Control and it has been performed jointly with the thesis Portable Robot Programming. The robots mentioned in the title of the Master thesis are industrial robots. Industrial robots are embedded real-time systems. In the embedded real-time systems the computer is part of the system. As all other real-time systems they have to fulfill real-
This Master Thesis has been done at the Department of Automatic Control, Lund Institute of Technology, and Dynasim AB, in Lund. Dynasim develops the simulation software called Dymola (Dynamic Modeling Laboratory). With the upcoming release 6, they have introduced the opportunity of interfacing their software with an optimization tool called MOPS (Multi-Objective Parameter Synthesis). This work sho
Abstract Customer demands for board adapted for their specific needs make a flexible production with many different qualities advantageous. The board quality changes can include a change in the composition or only a change in grammage. A grade change is a product quality change in a paper or board machine. Grade changes may however cause problems in the production. When changing the production fro
The aim of this thesis was to design and implement a lifetime monitoring system for a GE Energy wind turbine. Monitoring the loads on the main components of a wind turbine makes it possible to keep the lifetime of the components monitored. This information can be used to enable more flexible planning of a wind turbine's maintenance. Knowing the estimated remaining lifetime makes it possible to
The DARPA Grand Challenge (DGC) 2005 was a competition, in form of a desert race for autonomous ground vehicles, arranged by the U.S. Defense Advanced Research Project Agency (DARPA). The purpose was to encourage research and development of related technology. The objective of the race was to track a distance of 131.6 miles in less than 10 hours without any human interaction. Only public GPS signa
The US Department of Defense wants one third of ground military forces to be automated by 2015. By using self-driving military vehicles, American troops can be kept out of harm's way in the battlefield.1 To speed up the development, the US Department of Defense decided to arrange a desert race for autonomous vehicles, DARPA Grand Challenge. Team Caltech is entering the Challenge with the vehic
The 'Spider Crane' is a crane structure that has been developed at the department for automatic control at 'Ecole Polytechnique Fédérale de Lausanne'. This crane structure does not have a moving mechanical structure, which enables it to move the load much faster than a conventional crane. In a previous thesis project a control algorithm for the crane behavior has been developed. Th
Untripped SUV (Sport Utility Vehicle) rollovers are dangerous and possibly lethal accidents. This thesis address some issues in the detection and prevention of untripped SUV rollovers. Before a rollover can occur, the wheels on one side must lose road contact. The wheel lift-off situation is chosen as the critical situation to be avoided. If wheel lift-off is prevented, then rollover is prevented
This master thesis work concerns fault detection and isolation (FDI) of an electro-mechanical servo using analytical redundancy. The purpose is to reduce the number of sensors used in today's fault detection schemes and at the same time keep the level of redundancy in the system. The report will start with a comparison between physical and analytical redundancy. Whichever design method that is
The content of this master thesis regards the implementation of a control system in RTLinux/Free, and the use of this for control of a straight track inverted pendulum. A controller developed on the hypothesis that the system is sampled with the sampling time ts will perform differently than expected if sampled with the sampling time t _= ts. If implemented in a regular operating system, the compu
Thermoacoustic instability is a phenomenom that appears in several technical applications, for instance rocket and jet engines, gas turbines, waste generators and industrial burners where it can cause heavy damage to the systems. As with most instabilities, they are undesired and this thesis' purpose is to identify and control a Rijke tube process (which has been used to stimulate the thermoac
During the production of pharmaceutical products, a central stage is so called fermentation process i.e. cultivation of bacteria in a biological reactor. In the scope of this Master Thesis the product is recombinant protein. The goal for the fermentation process is to keep a high cell growth and a high production of recombinant proteins. For these purposes, an automatic control algorithm has been
This master thesis project has been performed in cooperation with AGA, the well-known gas company which is a part of the German Linde group and the Department of Automatic Control, Lund Institute of Technology. Since summer 2000 AGA has developed and manufactured a fully automated reactor producing bicarbonate solution for stabilizing pH in papermaking processes. The reactor or ACU!22 (alkalinity
The deteriorating effects of friction on the control of mechanical systems is a major problem in a multitude of applications such as high-performance robotics and pointing systems. This thesis aims at improving control by using a nonlinear friction observer to detect friction in the system and use this information to modify the control input. After some initial attempts with the LuGre friction mod
This master thesis is the first step in developing a new laboratory process for the automatic control basic course. The new process should illustrate the benefits of state-space control compared to PID control. A process with several outputs to control is then desired as a single PID controller does not support such a system. The suggested process consists of two carts mounted on a linear rail and
In this thesis the possibility to use the discrete-event modelling tool JGrafchart as a front end to the object-oriented modelling language Modelica has been studied. In this context, a code generator from JGrafchart to Modelica has been implemented. The code generator includes the basic JGrafchart objects like steps, transitions and variables, but also hierarchical elements like macrosteps and in
