PASSIVE DEVICES FOR WAVE INDUCED VIBRATION CONTROL IN OFFSHORE STEEL JACKET PLATFORMS

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GOLAFSHANI A.A.; GHOLIZAD A.

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Journal Paper

Paper Information

Journal: SCIENTIA IRANICA Year:2009 | Volume:16 | Issue:6 (TRANSACTION A: CIVIL ENGINEERING) Page(s): 443-456

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Information Journal Paper

Title

PASSIVE DEVICES FOR WAVE INDUCED VIBRATION CONTROL IN OFFSHORE STEEL JACKET PLATFORMS

Author(s)

GOLAFSHANI A.A. | GHOLIZAD A. | Issue Writer Certificate

Keywords

STEEL JACKET PLATFORMS

POWER SPECTRAL ANALYSIS

FRICTION DAMPER

STOCHASTIC LINEARIZATION

TUNED MASS DAMPER

GENETIC ALGORITHM

Abstract

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 exible 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.

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APA: Copy

GOLAFSHANI, A.A., & GHOLIZAD, A.. (2009). PASSIVE DEVICES FOR WAVE INDUCED VIBRATION CONTROL IN OFFSHORE STEEL JACKET PLATFORMS. SCIENTIA IRANICA, 16(6 (TRANSACTION A: CIVIL ENGINEERING)), 443-456. SID. https://sid.ir/paper/289874/en

Vancouver: Copy

GOLAFSHANI A.A., GHOLIZAD A.. PASSIVE DEVICES FOR WAVE INDUCED VIBRATION CONTROL IN OFFSHORE STEEL JACKET PLATFORMS. SCIENTIA IRANICA[Internet]. 2009;16(6 (TRANSACTION A: CIVIL ENGINEERING)):443-456. Available from: https://sid.ir/paper/289874/en

IEEE: Copy

A.A. GOLAFSHANI, and A. GHOLIZAD, “PASSIVE DEVICES FOR WAVE INDUCED VIBRATION CONTROL IN OFFSHORE STEEL JACKET PLATFORMS,” SCIENTIA IRANICA, vol. 16, no. 6 (TRANSACTION A: CIVIL ENGINEERING), pp. 443–456, 2009, [Online]. Available: https://sid.ir/paper/289874/en

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