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Efficient Time-Domain Model for Frequency-Dependent Added Mass and Damping

[+] Author Affiliations
Karl Erik Kaasen, Knut Mo

Norwegian Marine Technology Research Institute, Trondheim, Norway

Paper No. OMAE2004-51495, pp. 885-891; 7 pages
doi:10.1115/OMAE2004-51495
From:
  • ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
  • 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B
  • Vancouver, British Columbia, Canada, June 20–25, 2004
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3743-2 | eISBN: 0-7918-3738-6
  • Copyright © 2004 by ASME

abstract

In simulation of 1st -order wave-induced motion of vessels it is sometimes necessary to express frequency-dependent added mass and damping in time-domain formulation. One way to do this is to transform the frequency dependence into retardation functions. During simulation these are convolved with the velocity history, which is time-consuming and impractical. To get a more efficient model a method for expressing the retardation function as a linear differential equation has been developed. The method calculates the coefficients of the differential equation from the damping function only, avoiding the uncertain added mass function.

Copyright © 2004 by ASME
Topics: Damping

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