Sökning: "ljuddämpare"

Visar resultat 16 - 20 av 28 uppsatser innehållade ordet ljuddämpare.

  1. 16. CFD-simulations of urea-waterspray in an after-treatment systemusing Star-CCM+

    Master-uppsats, KTH/Mekanik

    Författare :Emelie Trigell; [2018]
    Nyckelord :after-treatment systems; selective catalytic reaction SCR ; AdBlue; multiphase flow; multi-component liquid; Unsteady Reynolds Average Navier Stokes RANS ; wall film formation; solid deposits; efterbehandlingssystem; selektiva katalytiska reaktioner; AdBlue; flerfasstr ¨ommning; flerkomponentvätska; Unsteady Reynolds Average Navier Stokes; väggfilm; avlagringar;

    Sammanfattning : The legislation has forced the vehicle industry to reduce tail-end emissions. The air pollutant nitrogen oxide (NOX) has been shown to have a negative impact on human health and the environment. One of the key technologies to reduce the levels of NOX emitted from a vehicle is by implementing an after-treatment system. LÄS MER

  3. 17. Optimization of the AdBlue e vaporation module for Scania V8 engines

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Mattia Antoniotti; [2017]
    Nyckelord :CR; evaporation unit; urea deposits; heat fins; Urea; förångningsmodulen; ureaavlagringar; rörflänsar;

    Sammanfattning : The aftertreatment techniques introduced to follow the emission legislations require a constant improvement process to comply with the gradually more stringent demands. SCR is the system used nowadays to deal with NOx emissions in most heavy-duty vehicles. LÄS MER

  4. 18. Ljudalstingsmekanismer och beräkning av ljudtrycksnivå i fläktrum

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Carl Edman; [2016]
    Nyckelord :;

    Sammanfattning : When a fan room is to be built, it is important to have knowledge about the magnitude of the sound pressure level in the fan room since it will be used to dimension the surrounding structures. To be able to pre-calculate this sound pressure must assumptions about the characteristics of the room, the fan and the duct system be made. LÄS MER

  5. 19. Förskolan Hoppet

    M1-uppsats, Umeå universitet/Institutionen för tillämpad fysik och elektronik

    Författare :Isak Högström; [2016]
    Nyckelord :;

    Sammanfattning : Detta examensarbete uppförts i samarbete med VVS konsulterna Skellefteå. Det behandlar en jämförelse av ventilationssystem på en förskola på Sofiehem som är planerad att stå klar 2017. LÄS MER

  7. 20. A framework for designing a modular muffler system by global optimization

    Magister-uppsats, KTH/Optimeringslära och systemteori

    Författare :Fredrik Frithiof; [2015]
    Nyckelord :Muffler Optimization; Four-pole Method; Transfer Matrix Method TMM ; Global Search; MultiStart; Genetic Algorithm; Pattern Search; Simulated Annealing; Ljuddämparoptimering; 4-polsmetoden; Transfer Matrix Method TMM ; Global Search; MultiStart; Genetic Algorithm; Pattern Search; Simulated Annealing;

    Sammanfattning : When creating a muffler to be installed on a noise generating machine, the design parameters as well as the placements of sound attenuating elements has to be optimized in order to minimize the sound coming out of the equipage. This is exemplified in a small project task for students of a basic course in optimization at KTH. LÄS MER