the effect of semi-active controller in sirri jacket seismic vibration control
Authors
abstract
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 proposed as a powerful tool to control seismic vibration of platform. a combination of four mr dampers and six friction pendulum isolators on the joints of cellar deck is applied for dynamic control of an existing steel jacket. in order to accurately evaluate the performance of sirri jacket with mr dampers under kobe seismic excitation, the platform numerically modeled in sacs software. the size of generated model with 198 degree-of-freedoms (dofs) was dynamically reduced so as to be utilized in semi-active control algorithm. to this end, the stiffness, mass and damping matrices of the model has been reduced to the 25 dofs model by programming in matlab software. the algorithm is used in this study for semi-active control of platform was h2/lqg. comparison between dynamic response of the jacket with and without using semi-active controller showed a great difference in quantity of joints displacement and acceleration. as a consequence, cellar deck joints displacement and acceleration reduced about 50% in average. the results of using semi-active mr dampers showed that the earthquake-induced vibrations can be effectively suppressed by the isolation layer with mr dampers.
similar resources
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 textAssessment 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 textassessment 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 textType-1 and Type-2 Fuzzy Logic Control Algorithms for Semi-Active Seismic Vibration Control of the College Urban Bridge Using MR Dampers
In this study, the application of type-1 and type-2 fuzzy inference system (FIS) in semi-active seismic vibration control of the College Bridge using magnetorheological (MR) dampers is investigated. For this purpose, a detailed 3D finite element model of the bridge fitted with MR dampers is created in OpenSees. The command voltage of MR dampers is determined by employing both types of FISs in M...
full textthe effect of the record infancy in crimilly acts of guilties (in karaj city)
چکیده یکی از مهمترین دغدغه های بزرگ جوامع بشری، از دیر باز تا کنون که ذهن پژوهشگران و متخصصان بهداشت روانی و اجتماعی و دولتها رابه خود مشغول داشته، مسأله ی بزهکاری می باشد. شناخت کامل پدیده ی بزهکاری و بزهکار، علل وعوامل سقوط یک انسان، چگونگی درمان وی و درنهایت پیشگیری ازبزهکاری ودریک کلام سالم سازی یک جامعه، رسالت عظیم، انسانی ومقدسی می باشد که با بررسی شخصیت مجرم یعنی[ انسانی که تحت شرای...
15 صفحه اولthe washback effect of discretepoint vs. integrative tests on the retention of content in knowledge tests
در این پایان نامه تاثیر دو نوع تست جزیی نگر و کلی نگر بر به یادسپاری محتوا ارزیابی شده که نتایج نشان دهندهکارایی تستهای کلی نگر بیشتر از سایر آزمونها است
15 صفحه اولMy Resources
Save resource for easier access later
Journal title:
international journal of marine science and engineeringISSN 2251-6743
volume 3
issue 2 2013
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023