assessment of semi-active tunes mass damper application in suppressing seismic-induced vibration of an existing jacket platform

Authors

samira babaei university of qom, qom, iran

roohollah amirabadi university of qom, qom,iran

touraj taghikhany amirkabir university of technology, tehran, iran

abstract

in this study, mass, stiffness and damping matrices of the nosrat jacket; located in persian gulf; equipped with semi active tuned mass damper (satmd) system have been derived after modeling the structure in sacs software. owing to huge number of the degrees of freedom in the model, computation of on-line control of satmd was time consuming. for this purpose, the size of the model was reduced in the finite time and frequency intervals by programming in matlab software. the satmd utilized in this study, contains a passive tuned mass damper (tmd) and   two magneto rheological (mr) dampers in order to illustrate the control effect of satmd. the selected algorithm to control and optimize the performance of mr damper is linear quadratic gaussian (lqg). time history responses of the platform in cases with and without satmd have been compared under three different ground motions. results indicate that jacket equipped with satmd can dramatically reduce the seismic-induced dynamic responses.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Assessment of Semi-Active Tunes Mass Damper Application in Suppressing Seismic-Induced Vibration of an Existing Jacket Platform

In this study, mass, stiffness and damping matrices of the Nosrat jacket; located in Persian Gulf; equipped with Semi Active Tuned Mass Damper (SATMD) system have been derived after modeling the structure in SACS software. Owing to huge number of the degrees of freedom in the model, computation of on-line control of SATMD was time consuming. For this purpose, the size of the model was reduced i...

full text

The effect of semi-active controller in Sirri jacket seismic vibration control

The Sirri jacket offshore platform was designed and installed in Persian gulf of Iran in 1975 and has been in service since that time. The importance of offshore structure's stability and the failure of this kind of structure during an earthquake in different active zones revealed that earthquake loading has to be considered. In this paper, Magnetorheological (MR) fluid dampers have been propos...

full text

Fuzzy Control of Seismic Structure with an Active Mass Damper

Fuzzy theory is highly promising for active structural control. The advantage of fuzzy controllers over classical controllers is the limited number of measured structural responses used to implement the control rules and its intrinsic robustness. In this paper, Fuzzy rules were generated firstly by learning from sample data obtained from the performance of the system under optimal control algor...

full text

the effect of semi-active controller in sirri jacket seismic vibration control

the sirri jacket offshore platform was designed and installed in persian gulf of iran in 1975 and has been in service since that time. the importance of offshore structure's stability and the failure of this kind of structure during an earthquake in different active zones revealed that earthquake loading has to be considered. in this paper, magnetorheological (mr) fluid dampers have been propos...

full text

the role of application of dynamic assessment approach in improvement of iranian efl writing performance at different language proficiency levels

the present study sought to investigate the role of dynamic assessment (da) in improvement of iranian efl writing performance at different language proficiency levels. to this end, after conducting the quick placement test, 60 iranian efl learners were assigned to two groups with different language proficiency levels. in both groups each participant wrote two compositions, one before and one af...

Upgrading the Seismic Capacity of Pile-Supported Wharfs Using Semi-Active Liquid Column Gas Damper

One of the most important structures in the ports is the wharf. The most common one is the pile-supported wharf. This type of wharf is consisted of a number of piles and one deck which placed on the piles. In addition to the conventional loads that this structure should withstand, in seismic areas, pile-supported wharfs should have the necessary capacity and strength against seismic excitations...

full text

My Resources

Save resource for easier access later


Journal title:
international journal of maritime technology

جلد ۶، شماره ۶، صفحات ۱-۱۰

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023