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Showing result 1 - 5 of 30 swedish dissertations matching the above criteria.

2. 1. Structural-acoustic vibrations in wooden assemblies : Experimental modal analysis and finite element modelling

   Author : Åsa Bolmsvik; Torbjörn Ekevik; Andreas Linderholt; Anders Brandt; Anders Ågren; Linnéuniversitetet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wooden framed structure; light weight buildings; multi-storey; flanking transmission; junction; vibration distribution; impact noise; damping; elastomers; finite element analysis; experimental modal analysis; FRF; trästomme; träkonstruktion; träbyggnad; flervåningshus; EMA; FEM; flanktransmission; koppling; knutpunkt; vibrationsspridning; stomljud; stegljud; dämpning; elastomerer; finit elementmetod; experimentell modalanalys; accelerationsmätning; frekvensresponsfunktion; modalanalys;

   Abstract : This doctoral thesis concerns flanking transmission in light weight, wooden multi-storey buildings within the low frequency, primarily 20-120 Hz. The overall aim is to investigate how the finite element method can contribute in the design phase to evaluate different junctions regarding flanking transmission. READ MORE

4. 2. Multiphysics Characterization of SiC Power Modules

   Author : Yafan Zhang; Hans-Peter Nee Nee; Mietek Bakowski; Ilja Belov; Alberto Castellazzi; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon carbide; power electronics; power electronics packaging; experiment; modeling and simulation; computational fluid dynamics; finite element analysis; multiphysics; Kiselkarbid; effektelektronik; effektelektronisk kapsling; experiment; modellering och simulering; flödesdynamisk numerisk modellering; finit-element-analys; multifysik; Electrical Engineering; Elektro- och systemteknik;

   Abstract : This thesis proposes several novel silicon carbide power module design concepts. The goal has been to address the problems with the present designs. The electrical, thermal, and thermomechanical performances of the demonstrators have been evaluated along with presentations of methodologies of experimental and numerical characterizations. READ MORE

5. 3. 3-D Forming of Paper Materials

   Author : Eric Linvill; Sören Östlund; Artem Kulachenko; Leif A. Carlsson; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 3-D forming; finite element method; constitutive model; moisture; temperature; biaxial; hydroforming; deep drawing; 3D formning; finita elementmetoden; konstitutiv modell; fukt; temperatur; biaxiell; hydroformning; djupdragning; Hållfasthetslära; Solid Mechanics;

   Abstract : Paper materials have a long history of use as a packaging material, although traditional paper-based packaging is limited in its shape, complexity, and design. In order to better understand the deformation and failure mechanisms during 3-D forming, two experimental studies of paper materials have been conducted. READ MORE

6. 4. Finite Element simulations: computations and applications to aerodynamics and biomedicine

   Author : Massimiliano Leoni; Johan Hoffman; David Kamensky; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; radiofrequency ablation; finite elements; numerical simulations; partial differential equations; biomedical applications; HPC; Computer Science; Datalogi;

   Abstract :   Partial Differential Equations describe a large number of phenomena of practical interest and their solution usually requires running huge simulations on supercomputing clusters.  Especially when dealing with turbulent flows, the cost of such simulations, if approached naively, makes them unfeasible, requiring modelling intervention. READ MORE

7. 5. Inverse and Forward Approaches for Optimal Control and Estimation in Agent-Based Systems

   Author : Yibei Li; Xiaoming Hu; Per Enqvist; Bijoy Ghosh; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Autonomous systems; inverse optimal control; system identification; nonlinear systems; formation control; differential game; credit scoring.; Autonoma system; invers optimal styrning; system identifiering; olinjära system; formationsstyrning; differentialspel; kreditvärdering.; Optimeringslära och systemteori; Optimization and Systems Theory;

   Abstract : This dissertation is concerned with three topics within the field of optimal control and estimation in dynamical agent-based systems, with potential applications that meet both engineering and societal needs. Firstly, the inverse optimal control problem is studied. READ MORE