Search for dissertations about: "unbalance"

Showing result 6 - 10 of 17 swedish dissertations containing the word unbalance.

  1. 6. Evaluation of strong nonlinearities in hydropower systems

    University dissertation from Luleå tekniska universitet

    Author : Florian Thiery; Luleå tekniska universitet.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Abstract : In hydropower systems, it is essential to avoid catastrophic failures that leads to human and economic losses. Unfortunately, the rotor can behave abnormally since several nonlinear effects occur during start-up, shut downs or when running at nominal speed. READ MORE

  2. 7. Modeling and Analysis of PMSM with Turn-To-Turn Fault

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Joachim Härsjö; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electromagnetic forces; vibration.; inter-turn; fault; fault detection; turn-to-turn fault; Permanent magnet synchronous machine PMSM modeling;

    Abstract : Thanks to its high-torque density and high efficiency, the Permanent Magnet Synchronous Machine (PMSM) is today used in a vast range of applications, spanning from automotive to wind. Since in a PMSM the excitation field is provided by a permanent magnet instead of a coil, this machine does not have a rotor circuit and thereby the risk for electrical failures can be isolated on the stator circuit. READ MORE

  3. 8. Non-stationary rotor vibrations due to assymmetric temperature from skew heating in bearings and seals

    University dissertation from Linköping : Linköpings universitet

    Author : Björn Larsson; Linköpings universitet.; Linköpings universitet.; [2000]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The genesis of this thesis is physical observations of slow alterations of synchronous rotor vibrations over time. It can lead to problems such as difficulties in performing proper balancing and unacceptably high vibration levels. The cause is often asymmetric heating of the rotor shaft. READ MORE

  4. 9. Static and Dynamic Measurement of Neurotransmitters in Drosophila Brain

    University dissertation from Göteborg : University of Gothenburg

    Author : Carina Berglund; Göteborgs universitet.; Gothenburg University.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Neurotransmitters, the substances neurons use for communication, and their precursors and metabolites are of obvious importance for the wellbeing of the individual and when the neurotransmitter balance is off it can lead to catastrophic suffering as in the addiction to drugs or in neurodegenerative diseases. By understanding how neurons communicate with the environment, treatment may be found to aid in the symptoms of unbalance. READ MORE

  5. 10. Static and Dynamic Measurements of Neurotransmitters in Drosophila Brain

    University dissertation from Göteborg : University of Gothenburg

    Author : Carina Berglund; Göteborgs universitet.; Gothenburg University.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Neurotransmitters, the substances neurons use for communication, and their precursors and metabolites are of obvious importance for the wellbeing of the individual and when the neurotransmitter balance is off it can lead to catastrophic suffering as in the addiction to drugs or in neurodegenerative diseases. By understanding how neurons communicate with the environment, treatment may be found to aid in the symptoms of unbalance. READ MORE