Sökning: "sound pressure characteristics"

Visar resultat 1 - 5 av 18 uppsatser innehållade orden sound pressure characteristics.

  1. 1. Rocket Jet Impinging on a Surface

    Master-uppsats, KTH/Teknisk mekanik

    Författare :Javier Capel Jorquera; [2022]
    Nyckelord :Rocket jet impinging on a surface; Favre-Averaged Equations; turbulence modeling; numerical considerations; Method of Characteristics; MOC; plate optimization;

    Sammanfattning : With the continuous growth of the space industry and the introduction of reusable rockets, the number of rocket launches is expected to increase significantly in the following years. During rocket launching, the engine exhaust impinges on the launch structure producing a complex flow field. LÄS MER

  3. 2. Accuracy verification of GT-Power model and reduction of computational time

    Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

    Författare :Viktor Dahl; Maja Dyrsmeds; [2022]
    Nyckelord :Vehicle acoustics; GT-Power; Exhaust system; Internal combustion engine;

    Sammanfattning : The noise produced by any new vehicles is tightly regulated by the European Union which have developed a standardised method for measuring the emitted noise of new vehicles. The method involves a vehicle driving past carefully positioned microphones at a specific range of engine speeds. LÄS MER

  4. 3. IC-Engine Source Characterisation and exhaust system simulations

    Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

    Författare :Pontus Gräsberg; [2021]
    Nyckelord :IC-engine; source characteristics; Multiload method; one-port source; exhaust system; Bränslemotor; källkarakterisering; avgassystem;

    Sammanfattning : 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. LÄS MER

  5. 4. Konstruktion av avgassystem till MC i syfte att förbättra dess motorkaraktär

    Kandidat-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Mats Vesterberg; [2020]
    Nyckelord :Cylinder pairing; Exhaust system; Scavenging; Torque; Avgassystem; Cylinderspolning; Cylinderparning; Vridmoment;

    Sammanfattning : Detta kandidatexamensarbete behandlar design och konstruktion av ett nytt avgassystem för en motorcykel. Utvecklingen grundar sig på resultat från en körning i bromsbänk av motorcykeln utrustad med original avgassystem, där det visar sig att det finns en påtaglig dipp i vridmoment mellan 4000 och 6500 rpm. LÄS MER

  7. 5. 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