Search for dissertations about: "Outdoor sound propagation"

Showing result 1 - 5 of 8 swedish dissertations containing the words Outdoor sound propagation.

  1. 1. Outdoor sound propagation under the influence of atmospheric turbulence

    Author : Mathieu Boué; KTH; []
    Keywords : outdoor sound propagation; wind and temperature gradients; turbulence; ground model;

    Abstract : .... READ MORE

  2. 2. Wind Turbine Sound Propagation in the Atmospheric Boundary Layer

    Author : Olof Öhlund; Conny Larsson; Anna Sjöblom; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Wind turbine sound; atmospheric effects; outdoor sound propagation; refraction;

    Abstract : Wind turbines have grown both in size and number in the past decades. The taller turbines has made it possible to place them in forest areas which is fortunate for a country like Sweden with lots of forest. An issue with wind turbines is the sound they produce. The sound mainly comes from the rotor blades when they pass through the air. READ MORE

  3. 3. Wind Turbine Sound in Cold Climates

    Author : Kristina Conrady; Anna Rutgersson; Karl Bolin; Sabine von Hünerbein; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; atmospheric acoustics; wind turbine sound; outdoor sound propagation; cold climates; Meteorology; Meteorologi;

    Abstract : The increase in the number of wind turbines (WTs) in populated areas in cold climates increases the number of people potentially being affected by WT sound. Outdoor sound propagation is strongly dependent on meteorological conditions, however, limitations in the knowledge exist regarding the implications of meteorological conditions in cold climates. READ MORE

  4. 4. Auralisation of airplanes considering sound propagation in a turbulent atmosphere

    Author : Frederik Rietdijk; Chalmers University of Technology; []
    Keywords : TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; Auralisation; Aircraft noise; Outdoor sound propagation; Atmospheric turbulence;

    Abstract : Aircraft noise is a major issue in urban areas. Due to a rising level ofurbanisation and the continuing growth of air traffic more people are exposed toaircraft noise than ever. Methods currently used for assessing theimpact of aircraft noise on humans consider mostly energetic quantities, and not thedynamic character of the sound. READ MORE

  5. 5. The Influence of Atmospheric Turbulence on Barrier Sound Reduction

    Author : Jens Forssén; Chalmers University of Technology; []
    Keywords : traffic noise; barrier; measurements; turbulence; scattering cross-section; substitute sources; outdoor sound propagation; parabolic equation method; random media; numerical modelling;

    Abstract : Numerical modelling and measurements are used for studying the reduced performance of a noise barrier, caused by a turbulent atmosphere. The turbulence scatters the sound, which leads to an increased noise level in the acoustic shadow region behind the barrier. READ MORE