Essays about: "Wallenberg"
Showing result 11 - 15 of 81 essays containing the word Wallenberg.
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11. Attenuation of fan noise with passive methods : An experimental study in the implementation of a ducted fan inside the body of a blended wing body UAV
University essay from KTH/Skolan för teknikvetenskap (SCI)Abstract : This report is about a novel approach to attenuation of fan noise in aerial vehicles, by way of implementing a ducted fan in the chassis of a four meter blended wing body plane. Three different one meter PVC pipes were used and their performances as silencers were tested by measuring the sound power level and calculating the insulation loss compared to a fan by itself. READ MORE
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12. Door closing sound quality related to door sealing stiffness
University essay from KTH/Marcus Wallenberg Laboratoriet MWLAbstract : The door closing action is a recurrent situation when using a vehicle, and its sound is therefore a common sensation, which would elicit pleasant feelings. Sensory pleasantness is an important aspect in terms of customer’s perspective, and it can be a contributing factor when deciding to buy or not a specific vehicle. READ MORE
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13. IC-Engine Source Characterisation and exhaust system simulations
University essay from KTH/Marcus Wallenberg Laboratoriet MWLAbstract : To be able to predict the sound pressure level emitted by a exhaust system one must be able to describe the source. The source in the form of an engine can linearly be described as a source strength and a source impedance. An IC-engine can acoustically have a non-linear part meaning that the source characteristics have a dependency on the load. READ MORE
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14. Duct mode evaluation for traction motor outlets
University essay from KTH/Marcus Wallenberg Laboratoriet MWLAbstract : This study investigates duct mode propagation at outlets of traction motors, featuring an open fan air-cooled architecture. Both acoustical measurements and simulations are employed. Measurements are performed for two duct outlet geometries, a radial and a non-radial outlet, both combined with an equidistant and a non-equidistant blade fan. READ MORE
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15. An indicative case-control study of noise perception due to environmental noise sources
University essay from KTH/Marcus Wallenberg Laboratoriet MWLAbstract : The subject of the thesis was proposed by the acoustic consultancy firm Brekke & Strand, which is of relevance for their additional understanding and development of services and contribution to robust solutions. The aim with this thesis is to give indicative results and to dig deeper into the relation between environmental noise and the perception of the same, specially focusing on construction related noise but also permanent noise sources that originates from infrastructure. READ MORE