Sökning: "Marcus Wallenberg"

Visar resultat 1 - 5 av 75 uppsatser innehållade orden Marcus Wallenberg.

  1. 1. Luftljudsisolering hos miljövänliga innerväggar: En experimentell studie

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

    Författare :Merna Danka; Förnamn Yasin Zian Nyhuus; [2023]
    Nyckelord :Träfiberisolering; stenullsisolering; pappersreglar; stålreglar; ljudreglar; luftljudsisolering; effektivitet och hållbarhet;

    Sammanfattning : Målet med projektet var att undersöka en miljövänlig innerväggs-konstruktions luftljudsisolering och hur den jämför sig med en standardinnervägg. Projektet genomfördes genom att konstruera två olika innerväggar i kombination med ett isoleringsmaterial. 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. Vibration reduction over junctions in buildings

    Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

    Författare :Alexander Forsberg; Aras Wali; [2021]
    Nyckelord :Vibration reduction; Junction; Building acoustics; Vibrations minskning; Knutpunkt; Byggnadsakustik;

    Sammanfattning : Structure borne sound can travel multiple paths from one office to another and choosing to sound insulate a specific building element can be difficult since all the building elements are connected together and form a coupled system. The current approach by engineers when investigating transmission paths between spaces in a building is using a computer model and assuming that the junctions are firmly clamped or free. LÄS MER

  5. 4. Experimental Study of Installation Effects on Cooling Fan Noise

    Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

    Författare :Yu-Yu Lu; [2021]
    Nyckelord :Electric vehicles; Cooling fan noise; Installation effects; Free-space measurement; Wall-mounted measurement; In-vehicle measurement; Spectral decomposition method; Tonality; Broadband noise level.;

    Sammanfattning : Owing to the ever-changing developments of battery and electric powertrain, vehicle electrification is the trend in the future. Without the presence of a combustion engine, masking effect from it reduces and noises from other components become perceivable. Among all, the cooling fan is one of the major noise sources. LÄS MER

  7. 5. A Numerical Approach for Wind Tunnel Noise Control

    Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

    Författare :Hampus Dall; Robert Palm; [2021]
    Nyckelord :Technical Acoustics; ANC; Active Noise Control; Superposition; Wind Tunnel; Wingsuit; Indoor Wingsuit; Higher Order Modal Acoustic Field Beyond Plane Wave Region; Numerical Acoustic Simulations; Teknisk Akustik; Aktiv Brusreducering; Superposition; Vindtunnel; Flygning med ekorrdräkt inomhus; Högre ordningens akustisk modanalys bortom planvågsteori; Numeriska akustiska simuleringar;

    Sammanfattning : A wind tunnel from the 1950s located in Bromma, Stockholm, once used for military research is today used for commercial activities. Today the tunnel is used for indoor wingsuit flight and the facility has an interest in reducing the overall noise generated by the tunnel. Acoustic measurements indicate noise problems in the 50 Hz range. LÄS MER