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Keywords: representation
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Proceedings Papers

Paper presented at the The 32nd International Ocean and Polar Engineering Conference, June 5–10, 2022
Paper Number: ISOPE-I-22-562
... by distributions of singularities over panels used to approximate the ship hull surface. This basic element of the Green-function method is considered for steady motion of ships in the subcritical and supercritical flow regimes. An analytical representation of the flow created by a general distribution...
Proceedings Papers

Paper presented at the The 32nd International Ocean and Polar Engineering Conference, June 5–10, 2022
Paper Number: ISOPE-I-22-536
... machine learning hyperparameter lbfg input1 neural network nn model prediction validation error neuron training data tensorflow input2 optimized hyperparameter regularization term artificial intelligence representation experimental data calculation time predictive value...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3231
... touboul representation interaction equation coupled-mode system vorticity application dispersion characteristic cms propagation upstream oil & gas boundary condition expansion belibassakis water wave bathymetry variable bathymetry variable bathymetry region conjunction...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-3103
... function radiation finite depth representation chen inconsistency frequency polynomial bureau veritas algorithm formulation chebychev polynomial accuracy coefficient green function integration New analysis on the Green function in water of finite depth Xiaobo Chen, Charaf Ouled Housseine...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-042
... Society of Offshore and Polar Engineers (ISOPE) ISBN 978-1 880653 85-2; ISSN 1098-6189 www.isope.org three critical improvements in machine learning: sparse interactions, parameter sharing and equivariant representations. Pooling layer is adopted to replace the output of the network by using the overall...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-168
... can be expressed as a lin- ear Fourier superposition of elementary waves, and can also be evaluated very simply via the classical Fourier-Kochin approach; e.g. Noblesse et al (2013a), Huang et al (2013), Zhu et al (2017). The Fourier representation of ship waves consists of a superposition...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-264
... characteristic chord accuracy flexibility plastic mechanism deformation surface representation gradient section force plasticity plastic deformation beam element formulation stiffness matrix matrix artificial intelligence upstream oil & gas representation cyclic plasticity...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-383
... on genetic programming is adopted to discover the representation and parameters of vehicle model via mining dataset. The solution for the six degree of freedom of underwater vehicle model can be obtained via evolution after function set and terminals set are chosen. Results show that it achieves an more...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-444
... and near wake flow field calculated with 3 different distributions of the Gaussian smearing parameter are compared with experimental measurements. Local chord and lift coefficient scaled smearing distribu- tions are shown to yield a significant improvement in the representation of the computed tip...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-125
... for the satisfaction of the boundary conditions on a sloping seabed. Using the above representation, in conjunction with a variational principle, a coupled system of differential equations on the horizontal plane, with respect to the modal amplitudes, is derived. In the case of no shear the above coupled-mode system...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-024
..., and a non-oscillatory local flow component L. This basic decomposition into a wave and a local flow component is not unique. Three alternative decompositions and related single-integral representations of the Green function G are given in Noblesse (1982). Several alternative mathematical representations...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-038
... ADCoSOffshore. The first model is setup with Euler-Bernoulli beam elements, while the second one utilizes superelements for the joints' representation and Euler-Bernoulli beams for the remaining parts of the structure. Time domain simulations are run for deterministic and stochastic load cases and local jacket...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-480
... on the derivation of moment equations that describe the dynamics governing the two-time statistics. These are then combined with a closure scheme which arises from a non-Gaussian pdf representation for the joint response-excitation statistics. We demonstrate its effectiveness through the application on a bistable...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-549
... correspond wave energy converter frequency nonlinearity identification operator sustainability representation A Nonlinear Response Amplitude Operator for Complex Maritime Dynamical Systems, Wave Energy Converters and Offshore Applications Georgios D. Gkikas Maritime Research Institute Netherlands...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-749
... Wave Energy Converters (WECs) as these machines rely on their movements to extract useful power from wave motions - the mooring must constrain the WEC motion without detracting from power production. To evaluate candidate mooring layouts, a high fidelity representation of the mooring hydrodynamics may...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-522
... Abstract This study focuses on the characteristic curves representation for the hull form based on NURBS. With view to the problems in the existing NURBS method, the path curve parameterization method is proposed so that the flow field information can be introduced into the designed curve...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-360
.... The handling of complex boundaries is a crucial capability that a numerical method solving the MSWE must exhibit. In this work we show that an approach employing Finite Volume schemes to solve the LB Equation provides the desired ability for boundary representation at the expense of a reasonable increase...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-129
... representation and a lumped-mass cable system to capture the mooring line dynamics. This analysis revealed that an uncoupled model using the quasi-static mooring approximation can underestimate peak mooring line loads versus a coupled model using a dynamic mooring line. KEY WORDS: Floating wind turbine; coupled...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-603
... ABSTRACT This paper presents a framework for risk analysis based on the techniques FMEA (failure modes and effects analysis), CNEA (causal network event analysis), FTA (fault tree analysis) and BBN (bayesian belief network). The structure CNEA/FMEA intends to overcome the representation...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-132
... is satisfied at a discrete level, independently of the order of representation of the discrete fields in each model. To the authors' knowledge, the present algorithm is novel in that it can simultaneously handle (i) non-matching fluid and solid meshes, (ii) different polynomial orders of the basis functions...

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