Sökning: "direction giving"

Visar resultat 21 - 25 av 52 avhandlingar innehållade orden direction giving.

  1. 21. On Control of Back-to-Back Converters and Sensorless Induction Machine Drives

    Författare :Rolf Ottersten; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; active filtering; flux estimation; sensorless control; induction motor; back-to-back converter; pulsewidth-modulated rectifier; virtual flux; vector current control;

    Sammanfattning : This thesis focuses on design and analysis of the control system structure for back-to-back converter squirrel-cage induction machine drives. Particularly, sensorless control of induction machines, meaning vector control without a mechanical shaft sensor, and vector control of pulsewidth-modulated (PWM) rectifiers are considered. LÄS MER

  3. 22. Vibration discomfort due to multi-axis excitation

    Författare :Andi Rahadiyan Wijaya; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk akustik; Engineering Acoustics;

    Sammanfattning : This licentiate thesis focuses on vibration discomfort due to multi-axis excitation. It is based on three studies; the first two studies were conducted in a laboratory environment using motion platform and utilizing sinusoidal signals, and the last study was a field study that utilized a fork lift truck on an artificial test track with built in obstacles that allowed controlled transient vibration excitation. LÄS MER

  4. 23. Job satisfaction and emotional work tasks : dentists in Sweden and Denmark

    Författare :Kamilla Bergström; Malmö högskola; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; dentists; emotion work; job satisfaction; new public management; emotional dissonance; eudaimonia; private dentistry; public dentistry; work environment; psycho-social; interaction; dentist - patient relationship; trust; intrinsic rewards; organisation; dental education; tacit knowledge;

    Sammanfattning : Avhandlingen består av två studier som utgår från projektet ”Det goda arbetet”. Det överordnade syftet med projektet Det Goda Arbetet var att använda tandvård som ett exempel på ett arbete där relationerna med patienterna utgör arbetets kärna. LÄS MER

  5. 24. Methods to quantify and qualify truck driver performance

    Författare :Iulian Carpatorea; Slawomir Nowaczyk; Thorsteinn Rögnvaldsson; Wahde Mattias; Högskolan i Halmstad; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Driver performance; heavy-duty vehicle; fuel economy; fuel consumption; fuel prediction; truck driver;

    Sammanfattning : Fuel consumption is a major economical component of vehicles, particularly for heavy-duty vehicles. It is dependent on many factors, such as driver and environment, and control over some factors is present, e.g. route, and we can try to optimize others, e. LÄS MER

  7. 25. Dynamics and Structure of Negative Ions - Photoinduced double detachment on nano- and femtosecond time scales

    Författare :Hannes Hultgren; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The goal of the presented work is to investigate double detachment of negative ions on nano- and femtosecond time scales. I have performed three types of experiments. Femtosecond time resolved pump-probe experiments have been performed on electron dynamics in the valence shell of carbon, silicon and germanium atoms. LÄS MER