Search for dissertations about: "Noise reduction"

Showing result 1 - 5 of 294 swedish dissertations containing the words Noise reduction.

  2. 1. On Fluid Power Pump and Motor Design : Tools for Noise Reduction

    Author : Liselott Ericson; Jan-Ove Palmberg; Kalevi Huhtala; Linköpings universitet; []
    Keywords : ;

    Abstract : Noise and vibration are two of the main drawbacks with fluid power  systems. The increasing requirements concerning working environment as well as machines' impact on surroundings put components and systems to harder tests. The surrounding machines, e.g. READ MORE

  4. 2. On transient reduction in hearing aids

    Author : Anders Gingsjö; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; reduction; amplitude disparity; transient noise; detection;

    Abstract : .... READ MORE

  5. 3. Study of Supersonic Jet Noise Reduction using LES

    Author : Haukur Hafsteinsson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; G3D; Supersonic Jet; PIV; CD-nozzle; CFD; Compressible flow; CAA; Noise Reduction; LES; Flow Control;

    Abstract : Increases in air traffic and denser population around airports have led to stricterregulations on aircraft noise. High noise levels from high-speed aircraft can causehearing damage in pilots and the airfield personnel. The engine is the main sourceof noise of all jet aircraft and is therefore a key component for improvement. READ MORE

  6. 4. Prediction and Optimisation of Traffic Noise. A Study on Noise Barriers and Shielded Areas

    Author : Pontus Thorsson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; city canyon; absorption; city noise; insertion loss; traffic noise; soundscape; silent side; noise barrier; ground impedance;

    Abstract : The main contribution of noise levels in cities is today road traffic. The strongest source for all road vehicles is most often the tyre-road contact. This source position close to the ground is fortunate with respect to secondary noise abatement measures, such as absorbing road surfaces or noise barriers. READ MORE

  7. 5. On Transient Noise and its Reduction in Hearing Aids

    Author : Anders Gingsjö; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gun shots; sound exposure; speech intelligibility; signal processing; transient reduction; hearing aid; transient noise;

    Abstract : The most important property of a hearing aid is to facilitate verbal communication for hearing impaired people. However, tuning of the acoustical parameters in a hearing aid in order to optimize the speech intelligibility may result in a harsh and unpleasant sound. READ MORE