Sökning: "Teknisk akustik"
Visar resultat 21 - 25 av 213 avhandlingar innehållade orden Teknisk akustik.
21. Crankshaft speed measurements and analysis for control and diagnostics of diesel engines
Sammanfattning : The increasing demands from governments on the engine manufactures to lower the fuel consumption, lower the exhaust emissions and to reduce the noise have lead to an intensive research in the combustion process. Measurement of the combustion process inside the cylinder is only suitable in laboratory environment due to a number of limitations; the pressure transducer needed to measure the pressure is expensive, difficult to mount in the cylinder and has a limited lifetime that is much shorter than the engine's lifetime. LÄS MER
22. Assessment and control of tonal components in electric vehicles
Sammanfattning : 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. LÄS MER
23. Methods for motor noise evaluation and control in electric vehicles
Sammanfattning : Complete vehicle, system and component target setting for noise, vibration and harshness (NVH) are important activities within automotive product development. New challenges arise when electric motors are introduced into cars traditionally powered by internal combustion engines (ICE). LÄS MER
24. Floor vibration : dynamic properties and subjective perception
Sammanfattning : This thesis covers research in the floor vibration field. Although lightweight steel framed constructions have been in focus, many results are applicable to floors in common and to some extent also to vibrations in general. LÄS MER
25. Reduction of resonant vibrations in lightweight floors
Sammanfattning : .... LÄS MER
