Sökning: "aircraft operation"

Visar resultat 11 - 15 av 39 avhandlingar innehållade orden aircraft operation.

  1. 11. An assessment of operational consequences of failures to support aircraft scheduled maintenance program development

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

    Sammanfattning : A majority of the direct and indirect maintenance costs in the life cycle of aircraft stems from the consequences of decisions taken during the initial maintenance program development. In particular, the preventive and corrective maintenance requirements, which greatly influence both the system availability and life cycle cost, need to be defined in order to perform only those preventive actions that are absolutely necessary and costeffective. LÄS MER

  3. 12. The Tail Assignment Problem

    Författare :Mattias Grönkvist; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hybrid optimization; fleet planning; aircraft routing; column generation; airline optimization; tail assignment; constraint programming;

    Sammanfattning : The Aircraft Assignment problem is the problem of assigning flights to aircraft in such a way that some operational constraints are satisfied, and possibly that some objective function is optimized.We propose an approach to aircraft assignment which captures all operational constraints, including minimum connection times, airport curfews, maintenance, and preassigned activities. LÄS MER

  4. 13. Analysis of Electro-Meachanical Actuator Systems in More Electric Aircraft Applications

    Författare :Mohsen Torabzadeh-Tari; Göran Engdahl; Fredrik Stillesjö; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Elektroteknik; Electrical engineering; Elektroteknik;

    Sammanfattning : Conventional hydraulic actuators in aircraft are demanding regarding maintenance which implies high operation costs. In recent years the focus therefore has been set on electro-hydrostatic and electro-mechanical actuators. LÄS MER

  5. 14. Dimensioning Tools of MEA Actuator Systems, Including Modeling, Analysis and Technology Comparison

    Författare :Mohsen Torabzadeh-Tari; Göran Engdahl; Hans Bernhoff; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dimensioning tools; MEA; More Electric Aircraft; EMA; Electro Mechanical Actuator; EM; Electrical Machine; Converter; Inverter; Finite Element Method; FEM; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

    Sammanfattning : Aircraft design is an example of complex engineering where dimensioning tools can be valuable for the designers and decision makers in the early stage of the development process. These tools can be in form of a database over key numbers for different components or technologies. One of the critical parts of an aircraft is the actuator system. LÄS MER

  7. 15. A service-oriented approach to e-maintenance of complex technical systems

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

    Sammanfattning : In today's global business scenarios, an organization can strengthen its com-petitiveness by offering a spectrum of industrial services that range from tra-ditional customer support to turnkey solutions. To achieve this service spec-trum, it is necessary to manage information consumption and production at right quality level in right time. LÄS MER