Search for dissertations about: "bridge resonance"

Showing result 1 - 5 of 30 swedish dissertations containing the words bridge resonance.

  2. 1. Train–Bridge Interaction : Literature Review and Parameter Screening

    Author : Therese Arvidsson; Raid Karoumi; Costin Pacoste; Weiwei Guo; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamics; vibration; railway bridge; bridge deck acceleration; moving load; train–bridge interaction; vehicle model; Civil and Architectural Engineering; Byggvetenskap;

    Abstract : New railway lines are continuously being constructed and existing lines are upgraded. Hence, there is a need for research directed towards efficient design of the supporting structures. READ MORE

  4. 2. Vibration mitigation of high-speed railway bridges : Application of fluid viscous dampers

    Author : Sarah Tell; Raid Karoumi; Ülker-Kaustell Mahir; Andreas Andersson; Bill F. Jr. Spencer; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamics; vibration mitigation; railway bridge; high-speed trains; bridge deck acceleration; passive damping; fluid viscous dampers; retrofit; dynamik; vibrationsdämpning; järnvägsbro; höghastighetståg; brobaneacceleration; passiv dämpning; viskösa dämpare; eftermontering; Byggvetenskap; Civil and Architectural Engineering;

    Abstract : At the moment of writing, an expansion of the Swedish railway network has started, by constructions of new lines for high-speed trains. The aim is to create a high-speed connection between the most populous cities in Sweden - Stockholm, Göteborg and Malmö, and the rest of Europe. READ MORE

  5. 3. Silicon nanogaps: An electronic bridge to the molecular world

    Author : Jonas Berg; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nanocrystals; TSRAM; Silicon nanogaps; Molecular electronics; Selective etching; Resonant Tunneling Diodes; Molecules;

    Abstract : We have designed and manufactured silicon nanogaps aimed at electrically interfacing molecules, utilizing the precision thickness control in an oxidation process. An insulating layer was formed on a silicon wafer, and then polysilicon was deposited on top. READ MORE

  6. 4. Efficient Modelling Techniques for Vibration Analyses of Railway Bridges

    Author : Christoffer Svedholm; Costin Pacoste; Pedro Museros; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Railway bridge; High-speed train; Closed-form solution; Non-proportional damping; Complex mode;

    Abstract : The world-wide development of new high-speed rail lines has led to more stringent design requirements for railway bridges, mainly because high-speed trains can cause resonance in the bridge superstructure. Dynamic simulations, often utilising time-consuming finite element analysis (FEA), have become essential for avoiding such problems. READ MORE

  7. 5. Low-Energy Modes of Molecules and Atoms Chemisorbed on a Metal Surface. CO and O on Pt(111) Studied by Infrared Spectroscopy

    Author : Ulrika Engström; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; dipole-allowed modes; low-energy modes; carbon monoxide; Infrared spectroscopy; dipole-forbidden modes; Pt 111 ; anti-absorption; Fermi resonance; atomic oxygen;

    Abstract : This thesis is devoted to the investigation of low-energy metal-adsorbate vibrational modes of CO molecules and O atoms chemisorbed on a Pt(111) surface using infrared spectroscopy (IRS). The infrared selection rule states that only vibrational modes having a non-vanishing component of its dynamical dipole moment perpendicular to the surface can be directly excited using IRS, known as dipole-allowed modes. READ MORE