This report describes the aeroelastic and aeromechanical dynamic instabilities encountered during design and development of helicopters and horizontal axis wind turbines. By definition, a dynamic instability is a self-excited vibration in which the amplitude of the motion becomes larger and larger with time and which (1) can stabilize to a higher level of vibration (limit cycle) or, (2) can go to the point of structure failure. The report is divided in two main parts, a first section which deals with problems related to helicopters and a second section which deals with the specific aeroelastic problems which are met in horizontal axis wind turbine configurations. According to the subsystems participating in the instability, dynamic instabilities are classified in two classes: (1) Dynamic Instabilities of the Rotor; (2) Dynamic Instabilities of the Rotor/Airframe for Helicopters or Rotor/Tower for the Wind Turbines. The rotor instabilities involve only the blade degrees of freedom such as flapping, lagging and torsion. In the rotor/body instabilities, the blade degrees of freedom couple to the body degrees of freedom.


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    Title :

    Literature Survey on Aeromechanical Instabilities for Helicopters and Wind Turbines


    Contributors:

    Publication date :

    1999


    Size :

    72 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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