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Utilization of Nonlinear Wave Motions in Magnetic Fields

[+] Author Affiliations
Jannette B. Frandsen

University of Hawai’i at Mānoa, Honolulu, HI

Paper No. OMAE2007-29573, pp. 739-744; 6 pages
doi:10.1115/OMAE2007-29573
From:
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 4: Materials Technology; Ocean Engineering
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4270-3 | eISBN: 0-7918-3799-8

abstract

In this contribution, the energy from steep waves is extracted from liquid sloshing in tanks. The aim is to develop a damping device to control structural vibrations in for example free standing towers, offshore platforms and other engineering structures. The focus of the work is to add further energy to the liquid sloshing motions through a magnetic field. Without the magnetic field, the damping device may be too heavy and thus impractical. We seek to develop light weight environmental friendly dampers. Liquid sloshing in tanks exhibit complicated free surface behavior, especially when the waves becomes steep and break. As a result, mode interactions occur which make it difficult for practitioners to know the performance of the tuned liquid dampers. It is also known that wave breaking in tanks is the source which provide maximum energy. It is this situation, we wish to exploit further in a magnetic field. Herein, small scale physical tests are undertaken in a square tank. The parametric study includes a variation of liquid, liquid depth, magnetic strength, forcing frequency and forcing direction. The preliminary results show that a magnetic field can suppress the free surface significantly, and thus provide additional energy, potentially resulting in smaller damping devices.

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