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Found 5 essays matching the above criteria.

  1. 1. Electron-skyrmion systems, in and out of equilibrium, and isolated or contacted to reservoirs

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Emil Adam Jonatan Östberg; [2023]
    Keywords : skyrmion; skyrmions; NEGF; freen s function; quantum transport; non-equlibrium; topology; topological charge; skyrmionics; current induced; open system; Physics and Astronomy;

    Abstract : A Kondo lattice skyrmion model in contact with a macroscopic environment is simulated to explore skyrmion dynamics, which is an extension of previous work. The system is simulated using non-equilibrium Green's functions within the generalized Kadanoff-Baym ansatz and the wide band limit. READ MORE

  3. 2. Robust Decentralized Control of Cooperative Multi-robot Systems : An inter-constraint Receding Horizon approach

    University essay from KTH/Reglerteknik

    Author : Alexandros Filotheou; [2017]
    Keywords : Model Predictive Control; Decentralized Control; Cooperative Systems;

    Abstract : In this work, a robust decentralized model predictive control regime for a team of cooperating robot systems is designed. Their assumed dynamics are in continuous time and non-linear. READ MORE

  4. 3. Model-based trajectory planning and control of underactuated mechanical systems

    University essay from Institutionen för tillämpad fysik och elektronik

    Author : Ehsan Rezapour; [2011]
    Keywords : ;

    Abstract : The problem of trajectory planning and control design for underactuated mechanicalsystems is a nontrivial task due to the presence of passive degrees of freedom in them. Inthis thesis, the virtual holonomic constraint approach is used for the trajectory planningand control design of a typical double link underactuated mechanical system, called thePendubot. READ MORE

  5. 4. Linear Time Periodic Analysis of Dc-Dc converter

    University essay from Lunds universitet/Institutionen för reglerteknik

    Author : Simone Del Favero; [2006]
    Keywords : HTM; Harmonic Transfer Matrix; HTF; Harmonic Transfer Function; LTP; Linear Time Periodic Systems; PWM; Dc-Dc converter; Pulse Width Modulator; subharmonics; chaos; subharmonic estimation; Technology and Engineering;

    Abstract : Aim of this thesis is to analyze Dc-Dc converters by using the techniques of Linear Periodic Time varying (LTP) systems to estimate the amount of subharmonics injected in the load. Dc-Dc converters are used to transform a Dc input to a Dc output of different voltage. In this thesis we study in particular the so called "switch mode" converters. READ MORE

  6. 5. Nonlinear Modeling of Locomotive Propulsion System and Control

    University essay from Lunds universitet/Institutionen för reglerteknik

    Author : Henrik Sandberg; [1999]
    Keywords : Technology and Engineering;

    Abstract : In this report the motor side of a converter driven AC-locomotive is studied and modeled. The motor side consists of an asynchronous electrical engine, an indirect self controller, a voltage converter, a Pulse Width Modulator(PWM) and the train mechanics. The converter is supplied with voltage from a DC-link. READ MORE