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Keywords: time series
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Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. May 2012, 134(2): 021103.
Published Online: December 2, 2011
... series of the motion responses and tether tension were recorded for a total of 18 three hour tests (full scale). In this paper we discuss the statistics of the measured tether tension. The focus is on a comparison of two alternative methods for the prediction of extreme tether tension from finite time...
Journal Articles
Article Type: Offshore Technology
J. Offshore Mech. Arct. Eng. August 2011, 133(3): 031301.
Published Online: March 31, 2011
..., special attention is given to the treatment of the signals ends by mean of stating adequate hypotheses on the behavior of the time series at their boundaries. Second, to validate the hypotheses on the boundary extensions made for the CWT analysis and to provide additional insight on the system behavior...
Journal Articles
Article Type: Structures, Safety and Reliability
J. Offshore Mech. Arct. Eng. November 2010, 132(4): 041604.
Published Online: September 23, 2010
...A. Naess; E. Haug The paper describes a novel method for predicting the appropriate extreme value distribution derived from an observed time series. The method is based on introducing a cascade of conditioning approximations to the exact extreme value distribution. This allows for a rational way...
Journal Articles
Article Type: Polar And Arctic Engineering
J. Offshore Mech. Arct. Eng. August 2010, 132(3): 031501.
Published Online: March 17, 2010
... are processed as a time series. Up-crossing rates at different local pressure levels are obtained for local areas of interest. A relationship between up-crossing rate and local pressure-area results is established. Results from the analysis of full-scale data using the event-maximum method are presented...
Journal Articles
Article Type: Ocean Engineering
J. Offshore Mech. Arct. Eng. February 2009, 131(1): 011103.
Published Online: December 11, 2008
... freak, abnormal, or episodic waves as additional wave load conditions to be considered in the design of ships and offshore platforms. In the previous work, a procedure was developed and implemented to adopt deterministic time series of wave elevation, which may include abnormal waves, as reference...
Topics: Waves, FPSO, Stress
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. May 2008, 130(2): 021007.
Published Online: June 6, 2008
... or some other phenomenon. Clearly, the question of whether or not there are different kinds of rogue waves cannot be readily answered by theoretical considerations alone and there is a crucial need for long-term wave time-series measurements for studying rogue waves. Draper , L. , 1964...
Journal Articles
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. February 2008, 130(1): 011006.
Published Online: January 29, 2008
..., the load data available are in two different formats: as 10 min statistics (referred to as “summary” data) or as full time series (referred to as “campaign” data). The characteristics of the site and environment and, hence, that of the turbine response are strikingly different for winds from the sea...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. August 2007, 129(3): 165–175.
Published Online: January 23, 2007
... system, with nonlinear damping and restoring terms. FTLEs are numerically calculated at every integration time step. Using this numerical model of parametric roll and through tracking trends in the FTLE time series behavior, warnings of parametric roll are identified. This work serves as a proof...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. August 2006, 128(3): 184–190.
Published Online: December 13, 2005
...C. Guedes Soares; S. N. Neves The method of empirical orthogonal functions (EOFs) is used to model vertical velocity profiles of the current. The whole current field is decomposed into time series of along and cross-slope velocity components. These time series are then filtered keeping only...
Journal Articles
Article Type: Technical Papers
J. Offshore Mech. Arct. Eng. August 2004, 126(3): 213–219.
Published Online: February 6, 2004
...Felice Arena; Silvia Puca A Multivariate Neural Network (MNN) algorithm is proposed for the reconstruction of significant wave height time series, without any increase of the error of the MNN output with the number of modelled data. The algorithm uses a weighted error function during the learning...