Search for dissertations about: "mechanical resonances"

Showing result 1 - 5 of 25 swedish dissertations containing the words mechanical resonances.

  2. 1. Torsional vibration absorbers in heavy-duty truck powertrains

    Author : Lina Wramner; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; friction; driveline; torsional vibrations; dual mass flywheel; PSVA; powertrain; tuned vibration absorber; power split vibration absorber; heavy-duty truck; simulations; anti-resonance; resonances; TVA; DMF;

    Abstract : The heavy-duty vehicle manufacturers face large challenges when it comes to reducing CO2 emissions from vehicles. The ongoing development of more efficient combustion engines leads to an increase in torsional vibrations. READ MORE

  4. 2. Elastic Wave Scattering by Closed Cracks and Thin Flaws - Multiple Scattering and Resonances

    Author : Arne S. Eriksson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SH-wave; evaluation of materials; direct integral equation; singularity expansion; ultrasonic testing;

    Abstract : In this thesis we study elastic wave scattering by thin flaws and closed cracks, which finds applications in ultrasonic testing and evaluation of materials. First we consider the scattering of an SH-wave by a thin finite elastic layer between two elastic half-spaces. READ MORE

  5. 3. Dual mass flywheels in truck powertrains, Modelling, simulations and validation

    Author : Lina Wramner; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DMF; simulations; heavy-duty truck; resonances; driveline; dual mass flywheel; powertrain; torsional vibrations; friction;

    Abstract : The heavy-duty vehicle manufacturers face large challenges when it comes to reducing CO2 emissions from vehicles. The on-going development of more efficient combustion engines leads to an increase in torsional vibrations. READ MORE

  6. 4. Modeling a carbon-nanotube-based nanoelectromechanical relay

    Author : Magnus Jonsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; surface forces; NEMS; carbon nanotubes; dissipation; nanorelay; mechanical resonances; stiction; high frequency applications; Nanoelectromechanical systems; field emission; tunable resonances;

    Abstract : We have theoretically investigated the properties of a three-terminal carbon-nanotube-based nanoelectromechanical relay. The system operationis based on an coupling between electrical and mechanical degrees of freedom which is a typical characteristic of a NEMS device. READ MORE

  7. 5. Guided Elastic Waves along Periodically Corrugated Structures

    Author : Ahmed M. A. El-Bahrawy; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The present thesis consider time-harmonic surface and guided elastic waves propagating along periodically corrugated structures. The problems discussed deal with various configurations where the surfaces are sinusoidally - singly or doubly - periodic, and the interest is focused on investigating the roots of the dispersion relations and in particular the stopband and cross-over resonances. READ MORE