Sökning: "aircraft operation"

Visar resultat 6 - 10 av 39 avhandlingar innehållade orden aircraft operation.

  1. 6. Numerical methods for load and response prediction for use in acoustic fatigue

    Författare :Johan Nilsson; Byggnadsmekanik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustic fatigue; Sonic fatigue; Computational Fluid Dynamics; Large Eddy Simulation; Finite Element Method; Random response analysis; Separated flow; High Re; Backward-facing step; Fence flow; Aircraft; Proper Orthogonal Decomposition; Acoustic fatigue; Sonic fatigue; Computational Fluid Dynamics; Large Eddy Simulation; Finite Element Method; Random response analysis; Separated flow; High Re; Backward-facing step; Fence flow; Aircraft; Proper Orthogonal Decomposition;

    Sammanfattning : Acoustic fatigue can occur in structural elements of an aircraft exposed to very high sound pressures. To deal with acoustic fatigue, mainly empirical methods have been applied and often late in the design phase. Current design guidelines have three main limitations. First, they do not say anything about the load intensities. LÄS MER

  3. 7. On the Realization of Credible Simulations in Aircraft Development : Efficient and Independent Validation Enabled by Automation

    Författare :Robert Hällqvist; Petter Krus; Magnus Eek; Robert Braun; Gerhard Schmitz; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aircraft Vehicle Systems; Credibility Assessment; FMI; Interoperability; Modelica; Modeling and Simulation; Model integration; SSP;

    Sammanfattning : Designing modern aircraft is not an easy task. Today, it is not enough to optimize aircraft subsystems at a subsystem level. Instead, a holistic approach is necessary whereby the constituent subsystems need to be designed for the best joint performance. LÄS MER

  4. 8. Enhancing Aircraft Conceptual Design using Multidisciplinary Optimization

    Författare :Daniel Raymer; KTH; []
    Nyckelord :aircraft design MDO optimization fighter UAV transport;

    Sammanfattning : Research into the improvement of the Aircraft ConceptualDesign process by the application of MultidisciplinaryOptimization (MDO) is presented. Aircraft conceptual designanalysis codes were incorporated into a variety of optimizationmethods including Orthogonal Steepest Descent (full-factorialstepping search), Monte Carlo, a mutation-based EvolutionaryAlgorithm, and three variants of the Genetic Algorithm withnumerous options. LÄS MER

  5. 9. On Standardized Model Integration : Automated Validation in Aircraft System Simulation

    Författare :Robert Hällqvist; Petter Krus; Magnus Eek; Robert Braun; Henrik Tidefelt; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Designing modern aircraft is not an easy task. Today, it is not enough to optimize aircraft sub-systems at a sub-system level. Instead, a holistic approach is taken whereby the constituent sub-systems need to be designed for the best joint performance. LÄS MER

  7. 10. Dependability analysis of military aircraft fleet performance in a lifecycle perspective

    Författare :Jan Block; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drift och underhållsteknik; Operation and Maintenance;

    Sammanfattning : Today's highly advanced technological flying platforms, such as aircraft, helicopters and Unmanned Air Vehicles (UAVs), are characterised by a high degree of complexity. Simultaneously, they are used in different operational and mission profiles, and also in multiple operational environments and geographical settings. LÄS MER