Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 25 for “"Automatiska system"”.
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Computational Methods for Optimal Control of Hybrid Systems
… to find algorithms for optimal control of hybrid systems and explore them in sufficient detail to be able to implement the ideas in computational tools. By hybrid systems is meant systems with interacting continuous and discrete dynamics. Code for computations has been developed in parallel to the …
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Closed-Loop Control of HCCI Engine Dynamics
… of HCCI combustion have been determined both by system identification and by physical modeling. Different methods for characterizing and controlling the HCCI combustion are outlined and demonstrated. In cases where the combustion phasing in a six-cylinder heavy-duty engine was controlled, either …
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Integrated Control and Real-Time Scheduling
… thesis is codesign of flexible real-time control systems. Integrating control theory and real-time scheduling theory, it is possible to achieve higher resource utilization and better control performance. The integration requires new tools for analysis, design, and implementation. The problem of …
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Dead-Time Compensation and Performance Monitoring in Process Control
… For online implementation in distributed control systems a simple recursive algorithm to estimate the index is presented. All parameters of the monitoring method are set by using the lambda tuning. The method applies equally to stochastic or deterministic disturbances. Finally an algorithm to …
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High-Speed Vision and Force Feedback for Motion-Controlled Industrial Manipulators
… Different topics ranging from basic theory to system implementation and applications are treated. A new interface developed for external sensor control is presented, designed by making non-intrusive extensions to a standard industrial robot control system. The structure of these extensions are …
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Modeling and Control of Plate Mill Processes
… multivariable model for the thickness control system is derived. The parameters of the model for the rolling mill are identified using data from The Danish Steel Works Ltd. and the model is used for designing a nonlinear multivariable thickness control algorithm. The algorithm is evaluated …
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A Graphical Language for Batch Control
… situations.Several commercial batch control systems exist today. They all have a similar approach to recipe structuring, resource allocation and user presentation. The advantages of using Grafchart compared to some of these systems, regarding these features are presented in the thesis. A …
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Dynamic Programming and Time-Varying Delay Systems
… for analysis of stability and performance of systems with time-varying delays. The two papers presented in the first part attacks optimal control problems with finite but rapidly increasing search space. In the first paper we try it reduce the complexity of the optimization by exploiting the …
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Industrial Robot Programming
… robots play a key role in manufacturing systems. Robots are distinguished from other types of machinery mainly on the basis of their programmability and ability to be adaptable to different tasks. The use of computer control to achieve desired flexibility implies that software issues for …
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Probing Control of Glucose Feeding in Escherichia coli Cultivations
Production of many proteins can today be made using genetically modified organisms. One of the most frequently used host organisms is the bacterium <i>Escherichia coli</i>. A difficulty encountered in cultivations of <i>E. coli</i> is the accumulation of the metabolic by-product acetate which …
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Modeling, Control and Optimization of a Plate Reactor
… derived based on first principles to conduct a system analysis and enable model-based control. The physical model allows a detailed investigation of the potential control inputs and how the process design and choice of inputs may affect the control design. Two control concepts are examined, …
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Model Reduction for Linear Time-Varying Systems
… treats model reduction for linear time-varying systems. Time-varying models appear in many fields, including power systems, chemical engineering, aeronautics, and computational science. They can also be used for approximation of time-invariant nonlinear models. Model reduction is a topic that …
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Analysis and Design of Hybrid Control Systems
Different aspects of hybrid control systems are treated: analysis, simulation, design and implementation. A systematic methodology using extended Lyapunov theory for design of hybrid systems is developed. The methodology is based on conventional control designs in separate regions together with a …
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Languages and Tools for Optimization of Large-Scale Systems
… means of Monte-Carlo simulation. In many control systems, it is necessary to consider interaction with a user. In this thesis, a manual control scheme for an unstable inverted pendulum system, where the inputs are bounded, is presented. The proposed controller is based on the notion of …
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Feeding Strategies Based on Probing Control for E. coli and V. cholerae Cultivations
The recombinant DNA techniques have made it possible to produce many different proteins for a wide range of applications. The vector encoding for the recombinant protein is often inserted in the bacterium E. coli as it is a well studied and a well-known organism. To achieve a high productivity, it …
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Probing Control : Analysis and Design with Application to Fed-Batch Bioreactors
In most control problems the objective is to control the output at a desired value in spite of disturbances. In some cases, the best setpoint is not known a priori and it should be found online to optimize the process performance. This thesis examines a probing strategy that can be applied for this …
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Flexible Embedded Control Systems : Design and Implementation
Embedded control system design is a complex and error prone task, and there is a great need for better development tools. Today most real-time control systems are static systems, designed in an ad-hoc fashion. A more interactive way of working would give shorter development times, reduced costs for …
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On Observer-Based Control of Nonlinear Systems
… states instead of the true ones. For linear systems, the separation principle assures stability for the use of converging state estimates in a stabilizing state feedback control law. In general, however, the combination of separately designed state observers and state feedback controllers …
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Modeling and Control of the Paper Machine Drying Section
The topic of this thesis is modeling and control of the last part of the paper machine - the drying section. Paper is dried by letting it pass through a series of steam heated cylinders and the evaporation is thus powered by the latent heat of vaporization of the steam. The moisture in the paper is …
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Resource-Constrained Embedded Control and Computing Systems
… resource constraints in embedded control systems and real-time computing systems. By dynamic feedback-based resource scheduling it is possible to achieve adaptability andincreased performance for these systems. A feedback scheduling strategy is presented, which uses feedback from plant …
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