Frequency Domain Long-Term Efficiency of Viscous Damper in Jacket Platforms Under Random Wave Load

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Frequency Domain Long-Term Efficiency of Viscous Damper in Jacket Platforms Under Random Wave Load

Mohammad Reza Tabeshpour1 · Hossein Janbazi Rokni2

Abstract Various types of controlling mechanisms have

been investigated to decrease vibrations of different structures,

and in many cases, the reliability has been increased

with respect to conventional methods of structural optimization.

Among them, using passive viscous damper is one of

the useful methods to control structure response due to environmental

loads. Hence, in this study, the effect of viscous

damper on vibration control of jacket platform (case study

oil platform SPD2 and Resalat) exposed to wave loads is

investigated, and with the sea state, long-term performance

of damper to reduce the structural response is introduced

for the first time the more suitable than the responses in an

especial case. To keep up this purpose, the platform is modeled

by finite element method, and wave spectra are radiated

to it. Spectral analysis is adopted to investigate the structural

response of the jacket platform equipped with viscous

dampers, and also, conventional arrangements of dampers

are analyzed to acquire optimal one. Then, the economically

optimal arrangement of damper is determined. The novelty of

this paper is that the results based on the sea states recorded

in the long term help one find the optimal arrangement of

damper.

Keywords Jacket · Long term · Viscous damper · Wave

 

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