Search for dissertations about: "Lamb waves"

Showing result 11 - 14 of 14 swedish dissertations containing the words Lamb waves.

  2. 11. Acoustic excitation and transmission of lightweight structures

    Author : Jonas Brunskog; Teknisk akustik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; point mobility; Lamb waves; wood.; Building construction; plate excitation; cavities; near-periodicity; nearly periodic; sound insulation; timber; structural acoustics; spatial Fourier transform; resilient device; prediction model; periodic; lightweight; ISO tapping machine; airborne noise; Building acoustics; impact noise; Byggnadsteknik;

    Abstract : In order to increase our knowledge of the sound transmission and radiation processes of lightweight wall and floor structures, theoretical models are needed. Detailed models may form a valuable tool. In lightweight floor structures, impact sound insulation is perhaps the most important property to consider. READ MORE

  4. 12. 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

  5. 13. Scattering of Elastic Waves from Inhomogeneities in Solids - Application to Ultrasonic NDT

    Author : Tomas Grahn; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The subject of this thesis is scattering of elastic waves from inhomogeneities in solids, with applications to ultrasonic nondestructive testing (NDT). The major part of the work concerns cracks in anisotropic solids, but the interaction of Lamb waves with circular holes in plates is considered as well. READ MORE

  6. 14. Vehicle parameter estimation using road surface vibrations

    Author : Roland Hostettler; Johan Casselgren; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Reglerteknik; Control Engineering;

    Abstract : Traffic safety is a big concern of many modern societies. Every year, car accidents cause many injuries and fatalities. This has aected many car manufacturers and governments equally. READ MORE