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...

In this paper prediction of the fatigue reliability of a fixed jacket offshore wind turbine designed for a North Sea site in a water depth of 70 m is performed. The longterm statistical distribution of stress ranges of tubular joints is obtained by combination of time domain simulation for representative sea states. The load histories are normalised to ensure that fatigue design criteria based ...

One of the policies that have been made by World Health Organization (WHO) and Indonesian government during this COVID-19 pandemic, is to use an oximeter for self-isolation patients. The used monitor patient if happy hypoxia which a silent killer, happens patient. To maintain body endurance, exercise needed patients, but doing too much can also cause decreased immunity. That’s why fatigue level...

Effect of earthquake directional uncertainty on the seismic response jacket-type offshore platform

Strengthening of columns using concrete jackets depends on friction at the interface between them. So strengthening edge and corner in only one story needs a large cross section area due to shortage length which leads architectural issues. This research aims study Jacket more than increases original column. As result, load transferred from column jacket will be increased. Thirteen models were d...

The sensitivity of the seismic response parameters to the uncertain modeling variables of pile-founded fixed steel jacket platforms are investigated using the Tornado diagram and the first-order second-moment techniques. The effects of both aleatory and epistemic uncertainty on seismic response parameters have been investigated for an existing offshore platform. The sources of uncertainty consi...

We review our recent work on Yb-doped and hybridstructured solid photonic bandgap fibers (Yb-HS-SPBGFs) for linearlypolarized fiber lasers oscillating in the small gain wavelength range from 1160 nm to 1200 nm. The stack-and-draw or pit-in-jacket method is employed to fabricate two Yb-HS-SPBGFs. Both of the fiber shows optical filtering property for eliminating ASE in the large gain wavelength ...