Search for dissertations about: "Sound reduction"
Showing result 1 - 5 of 78 swedish dissertations containing the words Sound reduction.
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1. Absorption of Sound : On the effects of field interaction on absorber performance
Abstract : Environmental noise has for decades been a well known problem, especially in urban areas. As noise requirements for vehicles are sharpened, noise reducing concepts are needed in early design stages requiring accurate simulations to support the design. READ MORE
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2. Sound Insulation at Low Frequencies
Abstract : The airborne sound transmission through building partitions at low frequencies was studied. The definition of the sound reduction index as a measure of sound insulation has been examined by means of extensive numerical simulations in 3-D domains. The simulations were based on the wave theoretical acoustics. READ MORE
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3. Airborne sound insulation of single and double plate constructions
Abstract : The sound insulation demands for dwellings and public building has increased over the years as the number of sound sources has grown. From the outside our homes are exposed to noise from cars, trains, airplanes, etc. Noise intrudes from our neighbours and their television and stereo equipments. READ MORE
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4. On Transient Noise and its Reduction in Hearing Aids
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
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5. The Influence of Atmospheric Turbulence on Barrier Sound Reduction
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