Sökning: "konstruktion"

Visar resultat 16 - 20 av 349 avhandlingar innehållade ordet konstruktion.

  1. 16. On the inception and propagation of streamers along mineral-oil/solid interfaces

    Författare :David Ariza; Marley Becerra; Olivier Lesaint; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis presents an experimental study of positive and negativestreamers propagating along mineral-oil/solid interfaces under square highvoltage pulses. The thesis includes the design and construction of anexperimental setup to studying the streamers in a point-plane configurationcapable to detect streamer parameters such as velocity, length, propagationtime, emitted light and charge. LÄS MER

  3. 17. On magnetic amplifiers in aircraft applications

    Författare :Lars Austrin; Göran Engdahl; Lars Liljestrand; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; magnetic amplifier magamp ; amorphous; power losses; control winding; self-saturating; hysteresis; converter; more electric aircraft MEA ; inverter; power-by-wire; dymola; permanent magnet generator; PM-generator transformer rectifier unit TRU ; constant speed drive CSD ; excess losses or anomalous losses; modeling; simulation; unmanned aerial vehicle UAV ; Electrical engineering; Elektroteknik;

    Sammanfattning : In the process of designing an electric power supply system for an aircraft, parameters like low weight and low losses are important. Reliability, robustness and low cost are other important factors. LÄS MER

  4. 18. Reliability Evaluation of Distribution ArchitecturesConsidering Failure Modes and Correlated Events

    Författare :Sajeesh Babu; Patrik Hilber; Hans Kristian Høidalen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Power systems are in a phase of automation where intelligent components and sub-systems are employed to monitor, control and manage the grid. Quantifying the complex consequences on system reliability, from the integration of such automated and semi-automated equipment into the existing grid is important for maintenance optimisation and fault mitigation. LÄS MER

  5. 19. Reliability Evaluation of Distribution Systems Considering Failure Modes and Network Configuration

    Författare :Sajeesh Babu; Patrik Hilber; Chanan Singh; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Power distribution networks are recognized as the constituent part of power systems with the highest concentration of failure events. Even though the faults in distribution networks have a local effect when compared to the generation and transmission sides, major contingency escalation events are being more frequently reported from this section. LÄS MER

  7. 20. On Optimal Maintenance Management for Wind Power Systems

    Författare :Francois Besnard; Lina Bertling; Lars Gertmar; KTH; []
    Nyckelord :Wind Power; Maintenance; Reliability; Optimization;

    Sammanfattning : Sound maintenance strategies and planning are of crucial importance for wind power systems, and especially for offshore locations. In the last decades, an increased awareness of the impact of human living on the environment has emerged in the world. LÄS MER