Sökning: "aircraft structures"

Visar resultat 1 - 5 av 50 avhandlingar innehållade orden aircraft structures.

  1. 1. Cost Optimization of Aircraft Structures

    Detta är en avhandling från Stockholm : KTH

    Författare :Markus Kaufmann; KTH.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aircraft structures; optimization; cost estimation; manufacturing cost; direct operating cost; multiobjective optimization; multidisciplinary optimization; composites; airframe design; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik;

    Sammanfattning : Composite structures can lower the weight of an airliner significantly. Due to the higher process complexity and the high material cost, however, the low weight often comes with a significant increase in production cost. The application of cost-effective design strategies is one mean to meet this challenge. LÄS MER

  2. 2. Aeroelastic Concepts for Flexible Aircraft Structures

    Detta är en avhandling från Stockholm : KTH

    Författare :Sebastian Heinze; KTH.; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aeroelasticity; active aeroelastic aircraft structures; aeroelastic control; wind-tunnel testing; flutter analysis; robust flutter analysis; worst-case configuration; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik;

    Sammanfattning : In this thesis, aeroelastic concepts for increased aircraft performance are developed and evaluated. Active aeroelastic concepts are in focus as well as robust analysis concepts aiming at efficient analysis using numerical models with uncertain or varying model parameters. LÄS MER

  3. 3. Cost/Weight Optimization of Aircraft Structures

    Detta är en avhandling från Stockholm : KTH

    Författare :Markus Kaufmann; KTH.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cost Weight Optimization; Weight Penalty; Direct Operating Cost; Composite Structures; Non-destructive testing; Finite element analysis FEA ; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Composite structures can lower the weight of an airliner significantly. The increased production cost, however, requires the application of cost-effective design strategies. Hence, a comparative value is required which is used for the evaluation of a design solution in terms of cost and weight. LÄS MER

  4. 4. Design and Testing of Flexible Aircraft Structures

    Detta är en avhandling från Stockholm : Farkost och flyg

    Författare :Martin Carlsson; KTH.; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aeroelasticity; active aeroelastic structures; aeroelastic tailoring; control; structural optimization; wind-tunnel testing;

    Sammanfattning : Methods for structural design, control, and testing offlexible aircraft structures are considered. Focus is onnonconventional aircraft con- figurations and control concepts.The interaction between analysis and testing is a central topicand all studies include validation testing and comparisonbetween computational and experimental results. LÄS MER

  5. 5. Acoustical Characteristics of Aircraft Panels

    Detta är en avhandling från Stockholm : KTH

    Författare :Bilong Liu; KTH.; [2006]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; sound transmission loss; stiffener; stiffening; aircraft panel; cylindrical shell; turbulent boundary layer; TBL; noise; sound radiation; TECHNOLOGY Engineering physics Acoustics; TEKNIKVETENSKAP Teknisk fysik Akustik;

    Sammanfattning : A deterministic approach based on a modal expansion and modal receptance method has been developed to evaluate the airborne sound insulation of aircraft panels with stringer and ring frame attachments. Furthermore, this method was extended to predict the noise radiation of stiffening panel subjected to TBL excitation. LÄS MER