... offshore tech dynamic equation simulation frequency procedure sea state tension response fatigue damage htfd approach spectrum mooring system assumption Plouedmgs of the FII st (1990 J EU/ opean OffshOi e Mecham(s Symposium TlOndhelm, NOIway, 20-22 August 1990 Copyl/ght © 1990...

... safety risk and uncertainty assessment procedure total probability operation statoil upstream oil & gas protection system template protection system installation scenario consequence fault tree predrilled well risk analysis construction human error risk management template...

... distribution is empirically formulated on the base of a number of stress range probability histograms obtained from the rainflow cycle counting algorithm using the Monte-Carlo procedure. Although the probability distribution introduced is general for both linear and nonlinear damage accumulations, in the paper...

... for pipeline steels IS Introduced which allows the calculation of stresses and strains for significant design cases to be accomplished in a rational manner The procedures suggested should allow the question of the acceptability of current stress limits to be explored further INTRODUCTION The design...

... prediction procedure it is possible to evaluate - for ,instance - the influence exerted upon the oscillating bodies by the geometry of the considered motion patterns (also the most complex ones), by the oscillation past history, by Keulegan Carpenter (KC) number, by the interaction of different currents...

...Proaedlngs of the First (199.0) European Offshore Mechanl(s SymposIUm Trondhelm, Norway, 20-22 August 1990 CopYright © 1990 by The InternatIOnal Society of Offshore and Polar Engineers ISBN 0-9626104-4-5 A SCALING PROCEDURE FOR MOORING EXPERIMENTS V J Papazog/ou and S A Mavrakos NatIonal TechnIcal...

... inclination. A detailed discussion of these effects is found in /4/. Methods for analysis Various methods for dynamic analysis exist. In the follOWIng the most important methods will be commented in relation to the prevIOusly described non-linearities. * Frequency domain (FD) analysis An FD procedure based...

... of the anchor damage to failure statistics and stressing its importance for an assessment of safety of pipelines. ship mechanics anchor stiffness operation fluke frequency anchor damage offshore pipeline scenario north sea protection cover deflection interaction deformation procedure...

... procedure artificial intelligence matenal notch stress Proceedings of the First (1990) European Offshore Methamcs Symposium Trondhelm, Norway, 20-22 August 1990 CopYllght © 1990 by The InternatIOnal Sotlety of Offshore and Polar Engineers ISBN 0-9626104-4-5 COMPUTER AIDED OPTIMIZATION OF T-JOINT...

... conditions, resonance accom- 358 panied by large amplitude vibrations of the pipeline may occur. In this situation the welds may be exposed to fatigue damage. Analysis procedures for free span assessment have reached a good quality level, in particular as regards structural modelling. The boundary conditions...

... to numerical modelling procedures and to assumptions made about the damping. When there was no current, the damping was affected by first-order velocities, and the damping coefficient by boundary layer forces and by the partial development of flow separation and vortex shedding at low Keulegan-Carpenter...

... for these failure conditions are discussed and included in the analysis. The reliability calculation procedure can be applied directly representing a full probabilistic design or indirectly through a proposed calibration procedure. INTRODUCTION The recent developments related to on-bottom submarine pipelines...

... assumption denote noise approximation stochastic linearization mssl standard method stochastic linearization method extreme response response level artificial intelligence deviation measure prediction procedure accurate estimate offshore structure exceedance probability equation...