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Passive devices for wave induced vibration control in offshore steel jacket platforms

Golafshani, A. A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: 2009
  3. Abstract:
  4. Performances of tuned mass dampers and friction dampers to mitigate the wave induced vibrations in jacket type offshore platforms have been compared in this study. Due to the random nature of ocean waves, a full stochastic analysis method has been used to evaluate the response of the structures equipped with these devices. A stochastic linearization technique has been used to take the nonlinear behavior of friction dampers into account. The developed mathematical formulation has been applied to evaluate the response of realistic models, and to find out the optimal values for the adjustable parameters of friction dampers. The results have been verified in comparison with time domain nonlinear analyses results. Also, a computer utility has been provided in FORTRAN to perform the spectral fatigue analysis of platforms and together with a Genetic Algorithm utility, it has been used to find out the optimal parameters of a tuned mass damper to dissipate the wave induced vibrations of the platforms. Although the efficiency of both dissipative systems increases for more flexible platforms due to the dominancy of the dynamic response, the functionality of TMD devices is more dependent on the dynamic characteristics of the platform; friction dampers seem to be more efficient for fixed steel jacket platforms. © Sharif University of Technology, December 2009
  5. Keywords:
  6. Friction damper ; Genetic algorithm ; Tuned mass damper ; Power spectral analysis ; Steel jacket platforms ; Stochastic linearization ; Tuned mass dampers ; Acoustic devices ; Damping ; Drilling platforms ; Dynamic response ; Friction ; Genetic algorithms ; Linearization ; Metal analysis ; Oceanography ; Offshore structures ; Spectrum analysis ; Spectrum analyzers ; Stochastic systems ; Time domain analysis ; Tribology ; Vibration control ; Water waves ; Vibration analysis ; Nonlinear wave ; Numerical model ; Ocean wave ; Spectral analysis ; Steel jacket platform ; Vibration
  7. Source: Scientia Iranica ; Volume 16, Issue 6 A , 2009 , Pages 443-456 ; 10263098 (ISSN)
  8. URL: http://scientiairanica.sharif.edu/article_3257.html