Sökning: "Ulf Orrenius"

Hittade 5 avhandlingar innehållade orden Ulf Orrenius.

  1. 1. Transmission of structure-borne sound in ships : applications to a prediction model

    Författare :Ulf Orrenius; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis examines transmission of structure-borne soundin rib-stiffened plate structures. In particular, theapplication of a prediction model for ships is analysed. Thismodel is based on a waveguide description of the structure. LÄS MER

  2. 2. Micro-Structure Modelling of Acoustics of Open Porous Material

    Författare :Eva Lundberg; Peter Göransson; Per Wennhage; Ulf Orrenius; Camille Perrot; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustics; porous material; flow resistivity; micro-structure; anisotropic; foam; strut; Farkostteknik; Vehicle and Maritime Engineering;

    Sammanfattning : Transportation is a large and growing part of the world’s energy consumption. This drives a need for reduced weight of rail vehicles, just as it does for road vehicles. In spite of weight reductions, the vehicle still has to provide the same level of acoustic comfort for the passengers. LÄS MER

  3. 3. Sound transmission properties of honeycomb panels and double-walled structures

    Författare :Sathish Kumar Ramanathan; Leping Feng; Ulf Orrenius; Bilong Liu; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Sandwich panels with aluminium face sheets and honeycomb core material have certain advantages over panels made of wood. Some of the advantages of these constructions are low weight, good moisture properties, fire resistance and high stiffness to-weight ratio etc. LÄS MER

  4. 4. Properties of vibration and sound transmission of plates with stop bands

    Författare :Yubao Song; Leping Feng; Ulf Orrenius; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : .... LÄS MER

  5. 5. Rotating Structure Modeling and Damping Measurements

    Författare :Jia Sun; Leif Kari; Damian Vogt; Ulf Orrenius; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; Akustik; Vehicle engineering; Farkostteknik; Järnvägsgruppen - Ljud och vibrationer; Järnvägsgruppen - Ljud och vibrationer;

    Sammanfattning : The structural damping is of importance to suppress the vibration amplitude of compressor blades rotating at high angular velocity under a high cycle impact. To avoid the appearance of the high cycle fatigue (HCF), damping materials may be applied to the compressor blades. LÄS MER