... discontinuities is performed, and frequencies are screened at levels nearly up to 2700Hz. The maximum modal stresses are taken at the elements for each mode, and the total stress cycles are counted to estimate the fatigue damage. A damage sum of unity is then used as the basis for calculating the acoustic fatigue...

... from the Hilbert transform and inversion modeling results (acoustic impedance and modeling uncertainty) were integrated to define better geological horizons and discontinuities. The results show the integrated geophysical subsurface models can support seismic interpretation and improve shallow marine...

... was written that performs data quality checks and corrections on the time series data before statistics are computed. Various types of errors that typically occur in a time series include noise, flat-lined data, clipped data, outliers, and discontinuities. Statistical procedures were developed to check...

... recurrence rate rock fall path coefficient rock fall hazard orientation boulder artificial intelligence rock mass hazard rock fall pipeline damage outcrop return period pipeline probability discontinuity Abstract Although relatively uncommon, rocky submarine outcrops with high to nearly...

... Abstract Piping systems having flow discontinuities like bends, tees, reducers and valves can experience acoustic induced vibration (AIV) or flow induced vibration (FIV) due to internal pressure fluctuations (acoustic or turbulent flow sources of excitation). The excitation may range from 20 Hz...

... accurate interpretation. Having delivered an improved seismic volume, advanced coherency algorithms were applied to understand discontinuities, at multiple scales, and spectral decomposition analysis was performed to better understand the distribution of seafloor and subsurface lithologies. The combined...

... that in addition to uncertainty prediction, the algorithm can also be used to statistically reduce the sharp discontinuities common in multiphase flow modeling, thus leading to improved simulation convergeance. Introduction Flow assurance and risk assessment are major issues in the offshore petroleum industry...

..., the seismic interpreter has to use his or her interpretive license in order to interpret or deduce the geometry and expression of various geologic features, such as faults and stratigraphic discontinuities. The standard 3-D seismic volume certainly shows seismic disturbances where large-displacement faults...

... be present in the as installed condition. Results of the initial findings are shown in Table 1. Although visual examinations of the affected X-brace connections using a ROV performed immediately after installing the jacket confirmed the absence of gross discontinuities, it was realized that this type...

... data to constrain the depth and configuration of a subsurface density discontinuity in a 3-D gravity modeling. The results of the seismically constrained gravity interpretation are in good agreement with seismic results, and the misfit of the predicted gravity field to the observed does not increase...

... on lower-bound S-N curves, usually the lower 95 percent confidence limit (assuming 10gN is normally distributed). The large variance in 10gN is primarily due to variance in the weld geometry and weld discontinuities. This inherently large variance makes it difficult to distinguish the secondary effects...

... positioning the member and holding it temporarily in place, a simple shutter is built up around each assembly surrounding the ring and a portion of the chord and brace. fatigue behaviour offshore technology conference mechanical creep redistribution rupture resin creep discontinuity resin...

... ABSTRACT Several influencing factors affect the results of data gathered during magnetic particle inspections, especially underwater. A new technique which makes use of Magfoils eliminates many of these unwanted factors. This technique can be used as the primary system to find discontinuities...

... discontinuity upstream oil & gas hydraulic fracturing drilling unit OTC 4036 FABRICATION AND SERVICEABILITY OF OFFSHORE STRUCTURES by Irving L. Stern and Bruno L. Alia, American Bureau of Shipping ©Copyright 1981 Offshore Technology Conference This paper was presented at the 13th Annual OTC In Houston...

... ABSTRACT A spherical submarine hull element is analyzed by means of a nonlinear finite-difference program. The imperfection sensitivity of this stiffened shell is greatly dampened by the structural discontinuities introduced through the stiffened portholes. The influence of shape imperfection...

... wave motion platform subsea system subsea structure offshore platform platform leg dolphin not-acoustic technology structural integrity exxon nuclear nondestructive examination installation transducer acoustic emmission technology upstream oil & gas discontinuity acoustic...