Search for dissertations about: "interior noise"
Showing result 16 - 20 of 37 swedish dissertations containing the words interior noise.
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16. Acoustic modeling and testing of exhaust and intake system components
Abstract : Intake and exhaust orifice noise contributes to interior and exterior vehicle noise. The order noise radiated from the orifice of the intake and exhaust systems is caused by the pressure pulses generated by the periodic charging and discharging process and propagates to the open ends of the duct systems. READ MORE
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17. Sound quality evaluation of heavy-duty engines in free field conditions
Abstract : Annoyance response to vehicle noise is commonly reported. The impact reduction measures must therefore be measured scientifically. A scientific system for describing and defining annoyance is therefore required. There is furthermore a need to reduce the annoying components of the sound of vehicles. READ MORE
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18. Assessment and control of tonal components in electric vehicles
Abstract : New challenges arise for noise, vibration and harshness (NVH) engineers when electric motors are introduced into cars traditionally powered by internal combustion engines (ICE). The noise signature from an electric traction motor is characterized by speed-dependent high frequency tonal components due to electro-magnetic excitation. READ MORE
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19. Optimised performance of industrial high resolution computerised tomography
Abstract : The purpose of non-descructive enluation (NDE) is to acquire knowledge of the investigated sample. Digital x-ray imaging techniques such as radiography or computerised tomography (CI) produce images of the interior of a sample. The obtained image quality determines the possibility of detecting sample, ·elated features, e.g. READ MORE
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20. Perception of Sound and Vibration in Heavy Trucks
Abstract : Interior truck cabin sound has for some time been a concern for manufacturers. Today reasonably low sound pressure levels have been achieved using passive absorption. However low frequency sound is difficult to passively absorb and will hence dominate the interior sound. READ MORE