Sökning: "Aeroacoustics"

Hittade 5 uppsatser innehållade ordet Aeroacoustics.

  1. 1. Hydroacoustic Modelling of Podded Propulsion System : Underwater Radiated Noise Prediction Using ANSYS

    Master-uppsats, KTH/Teknisk mekanik

    Författare :Martin Persson; [2022]
    Nyckelord :Fluid Mechanics; Computational Aeroacoustics; Frequency Response; Noise and Vibration; Pod; Propulsion System; ANSYS; Reynolds-Averaged Navier-Stokes Equations; Kongsberg Maritime Sweden AB;

    Sammanfattning : Ocean noise pollution is an invisible but growing threat. There are many sources of sound in the ocean but human underwater radiated noise, in particular from shipping is one of the most prominent one. Ocean noise pollution can interfere or sometimes even directly harm marine life. LÄS MER

  3. 2. Shape optimization of axial cooling fan via 3D CFD simulation and surrogate modeling

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Martin Granlöf; [2021]
    Nyckelord :Fan noise; shape optimization; mesh morphing; computational fluid dynamics; computational aeroacoustics; Efficient Global Optimization; Reynolds-averaged Navier-Stokes;

    Sammanfattning : Due to legislative reasons and environmental concerns the automotive and transport sector are shifting their focus from traditional internal combustion engine (ICE) vehicles to development of battery electric vehicles (BEVs). This brings new challanges to design of cooling systems where axial fans are one of the key components. LÄS MER

  4. 3. Multidisciplinary design Optimization in Aerodynamics and Aeroacoustics : Analysis of the A-Pillar

    Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

    Författare :Neeti Shetty; [2018]
    Nyckelord :Aerodynamics; Aeroacoustics; A-Pillar; Optimization;

    Sammanfattning : A roof above your head, when in a car, is made possible due to the component calledthe A-pillar in the automotive industry. This component is not only responsible forholding up the roof but also in providing a point for the windscreen to be attached. LÄS MER

  5. 4. Transonic Flow Features in a Nozzle Guide Vane Passage

    Master-uppsats, KTH/Farkost och flyg; KTH/Mekanik

    Författare :Alessandro Ceci; [2017]
    Nyckelord :CFD; LES; Indirect Combustion Noise; Aeroacoustics;

    Sammanfattning : The entropy noise in modern engines is mainly originating from two types of mechanisms.First, chemical reactions in the combustion chamber lead to unsteady heat releasewhich is responsible of the direct combustion noise. LÄS MER

  7. 5. Implementering av akustiska analogier i Openfoam och CALFEM/Matlab

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Teknisk fysik (CI); Lunds universitet/Teknisk akustik

    Författare :Johan Nilsson; [2010]
    Nyckelord :Technology and Engineering;

    Sammanfattning : Aeroacoustics is the field that studies flow induced sound. The source of sound can for example be fans, duct flows, aircraft propellers and objects mounted on the outside of a vehicle. The most often used computational methods for aeroacoustics are based on acoustical analogies. LÄS MER