Sökning: "Sven Johansson"

Visar resultat 1 - 5 av 52 avhandlingar innehållade orden Sven Johansson.

  1. 1. Active Control of Propeller-Induced Noise in Aircraft : Algorithms & Methods

    Författare :Sven Johansson; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; active control of sound; active noise control; anc; actuator individual normalized filtered-x lms; filtered-x lms algorithm; newton algorithm; complex lms; multireference algorithm; leaky lms; control effort weighting; feedforward control; feedback contro;

    Sammanfattning : In the last decade acoustic noise has become more and more regarded as a problem. In cars, boats, trains and aircraft, low-frequency noise reduces comfort. Lightweight materials and more powerful engines are used in high-speed vehicles, resulting in a general increase in interior noise levels. LÄS MER

  3. 2. Active Noise Control in Aircraft : Algorithms and Applications

    Författare :Sven Johansson; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; active noise control; feedforward control; filtere-x lms algorithm; complex lms; multichannel system; multiple reference; aircraft; headset;

    Sammanfattning : The thesis consists of five papers which are divided into three main parts. Parts A and B deal with active noise control in a propeller aircraft application, whereas Part C deals with active noise control in a helicopter application. LÄS MER

  4. 3. A computational study of interface structures and energetics in cemented carbides and steels

    Författare :Sven Johansson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; WC-Co; cemented carbides; interfaces; density functional theory; microstructure; sintering; steels;

    Sammanfattning : Cemented carbides are hard composite materials of great industrial importance. Because of their combination of hardness and toughness, they are used e.~g. for cutting, drilling, turning and milling. LÄS MER

  5. 4. Perceptual and physiological indicators of physical strain in relation to working capacity and illness

    Författare :Sven-Erik Johansson; Stockholms universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  7. 5. Skatt - investering - värdering : en teoretisk studie av hur hänsynstagande till inkomstskatt och penningvärdeförändringar påverkar dels investeringsobjekts ekonomiska livslängd och värdeminskningsförlopp, dels investeringars kapitalvärde och internräntefot

    Författare :Sven-Erik Johansson; Handelshögskolan i Stockholm; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Sammanfattning : .... LÄS MER