Sökning: "Flow-noise"

Hittade 5 uppsatser innehållade ordet Flow-noise.

  1. 1. Simulating flow-noise for after-treatment systems

    Master-uppsats, KTH/Teknisk mekanik

    Författare :Adam Sandström; [2020]
    Nyckelord :Flow-noise; CAA; DES; non-refelctive boundary conditions; stretched grid; Menter SST;

    Sammanfattning : Modern silencers for heavy vehicle applications are designed to cancel out the sound generated by the effects of combustion and propagation of exhaust gases through the engine after-treatment system. The complex geometry within the compact silencer give rise to self generated (or flow-) noise that contribute to the total sound power radiated at the exhaust outlet. LÄS MER

  3. 2. Aero and vibroacoustical prediction of the noise generated by turbulent boundary layers

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Alberto Alonso pinar; [2019]
    Nyckelord :;

    Sammanfattning : Flow noise is a major noise source in the transportation industry from the automotive up to the aircraft industry. The characterization of the aerodynamic excitations and of the structure transmission is of primary interest in order to improve the passenger and crew comfort. LÄS MER

  4. 3. Undersökning av akustiskaegenskaper hos ett insugningssystem

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Martin Nordenström; Rodrigue Bonnevie; [2018]
    Nyckelord :;

    Sammanfattning : En viktig del i arbetet med att konstruera tysta fordon är kännedomen om komponenternas akustiska egenskaper. I projektet har ett insugningssystem till en lastbil från Scania undersökts, och utstrålad ljudintensitet och ljudeffekt för olika delytor på systemet uppmätts. LÄS MER

  5. 4. Identification and modelling of noise sources on a realisticnose landing gear using phased array methods applied tocomputational data

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Hamza Bouchouireb; [2017]
    Nyckelord :;

    Sammanfattning : Due to the recent development of quieter turbofan engines, airframe noise has started to emerge asthe most important noise source. This is particularly true during the approach/landing phase, whenthe engines are operated at low-thrust levels. LÄS MER

  7. 5. Noise Radiation from Automotive Turbochargers

    Magister-uppsats, KTH/Farkost och flyg

    Författare :Wang Zhenrui; [2011]
    Nyckelord :;

    Sammanfattning : Turbochargers are now commonly used in modern automotive engines, which increase the density of air entering the engine to produce more power. This device not only greatly improves the degree of engine efficiency, but also reduces the pollutant emissions. However, one of the important issues which must be considered is the noise from turbochargers. LÄS MER