Search for dissertations about: "Modal parameters"

Showing result 1 - 5 of 65 swedish dissertations containing the words Modal parameters.

2. 1. Aircraft composites and aeroelastic tailoring

   Author : Jakob Kuttenkeuler; KTH; []
   Keywords : polymer composites; testing; resin; transfer molding; RTM; process parameters; mechanical properties; aircraft; impact damage; BVID; modal; inverse method; uncertainties; aeroelasticity; optimization; wind tunnel; TECHNOLOGY; TEKNIKVETENSKAP;

   Abstract : This thesis treats various aspects of structural polymercomposites in aircraft applications. The mechanical performanceand quality of resin transfer molded (RTM) carbon fiberreinforced epoxy composites is studied. READ MORE

4. 2. Wind-induced vibrations in tall timber buildings : Design standards, experimental and numerical modal analyses

   Author : Pierre Landel; Andreas Linderholt; Marie Johansson; Sigurdur Ormarsson; Petter Juell Nåvik; Linnéuniversitetet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tall Timber Building; Wind-Induced vibration; Along-Wind Acceleration; Modal Analysis; Forced Vibration Test; Finite Element Model Reduction; Truss; Semi-Rigid Connection; Bâtiment en Bois de Grande Hauteur; Vibration Induite par le Vent; Accélération Parallèle au Vent; Analyse Modale; Test de Vibration Forcée; Réduction de Modèle aux Eléments finis; Poteau Treillis; Connexion Semi-Rigide; Hög Trähus; Vindinducerad Vibration; Acceleration Längs med Vinden; Modalanalys; Forcerat Vibrationstest; Finita Element Modellreduktion; Fackverk; Halvstyva Förband; Maskinteknik; Mechanical Engineering; Byggteknik; Civil engineering;

   Abstract : Climate change and densification of cities are two major global challenges. Inthe building and construction industry, there are great expectations that tall timberbuildings will constitute one of the most sustainable solutions. First, verticalurban growth is energy and resource-efficient. READ MORE

5. 3. Test Design for Finite Element Model Updating - Identifiable Parameters and Informative Test Data

   Author : Andreas Linderholt; Thomas Abrahamsson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; modal tests; test design; identifiability; Fisher information; optimization; data informativeness; model updating; Maskinteknik;

   Abstract : It is important to predict structural phenomena, such as noise and fatigue, stemming from vibrations. To do this, reliable structural dynamic models are needed. To be useful the models have to compare well with reality in the validation against test data; if not, the models should be modified. READ MORE

6. 4. Transition in Particle-laden Flows

   Author : Joy Klinkenberg; Luca Brandt; Shuisheng He; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transition; modal analysis; non-modal analysis; multi-phase flow; particle-laden; heavy particles; light particles;

   Abstract : This thesis presents the study of laminar to turbulent transition of particle laden flows. When a flow becomes turbulent, the drag increases one order of magnitude compared to a laminar flow, therefore, much research is devoted to understand and influence the transition. READ MORE

7. 5. On modally distributed damping in heavy vehicles

   Author : Peter Holen; Annika Stensson Trigell; Zbigniew Lozia; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; damping; modal damping; chassis suspension; heavy vehicle; attachment compliance; Physics; Fysik;

   Abstract : This thesis investigates passive damping system performance in heavy vehicles through analytical expressions, simulations with different vehicle models as well as through experimental evaluation in a tractor semi trailer combination. The objective is to study what levels of chassis suspension damping that are desirable for different vehicle modes and how this may be achieved with passive damping systems. READ MORE