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Zili Zhang

Stability analysis of the Gyroscopic Power Take-Off wave energy point absorber

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  • Søren R. K. Nielsen, Denmark
  • Zili Zhang
  • Morten Mejlhede Kramer, Denmark
  • Jan Olsen, Denmark
The Gyroscopic Power Take-Off (GyroPTO) wave energy point absorber consists of a float rigidly connected to a lever. The operational principle is somewhat similar to that of the so-called gyroscopic hand wrist exercisers, where the rotation of the float is brought forward by the rotational particle motion of the waves. At first, the equations of motion of the system are derived based on analytical rigid body dynamics. Next, assuming monochromatic waves simplified equations are derived, valid under synchronisation of the ring of the gyro to the angular frequency of the excitation. Especially, it is demonstrated that the dynamics of the ring can be described as an autonomous nonlinear single degree-of-freedom system, affected by three different types of point attractors. One where the ring vibrations are attracted to a static equilibrium point indicating unstable synchronisation and two types of attractors where the ring is synchronised to the wave angular frequency, either rotating in one or the opposite direction. Finally, the stability conditions and the basins of attraction to the point attractors defining the synchronised motion are determined.
Original languageEnglish
JournalJournal of Sound and Vibration
Volume355
Pages (from-to)418-433
Number of pages15
ISSN0022-460X
DOIs
Publication statusE-pub ahead of print - 27 Oct 2015
Externally publishedYes

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