J. Offshore Mech. Arct. Eng.: All Topics http://scitation.aip.org/ J. Offshore Mech. Arct. Eng.: All Topics Floating Offshore Wind Turbine Dynamics: Large-Angle Motions in Euler-Space http://link.aip.org/link/doi/10.1115/1.4004630 Bert Sweetman and Lei Wang<br/> Floating structures have been proposed to support offshore wind turbines in deep water, where environmental forcing could subject the rotor to meaningful angular displacements in both precession and nutation, offering design challenges beyond conventional bottom-founded structures. This paper offers ... [J. Offshore Mech. Arct. Eng. 134, 031903 (2012)] published Fri Feb 10, 2012. Preliminary Design of Bottom-Fixed Lattice Offshore Wind Turbine Towers in the Fatigue Limit State by the Frequency Domain Method http://link.aip.org/link/doi/10.1115/1.4005200 Haiyan Long and Geir Moe<br/> The fatigue assessment of support structures is one of the most significant challenges in the design of offshore wind turbines (OWT). Fatigue analysis can be conducted in either the time-domain or the frequency-domain. The advantage of frequency-domain analysis is its time efficiency. This paper sho ... [J. Offshore Mech. Arct. Eng. 134, 031902 (2012)] published Thu Feb 2, 2012. Individual Pitch Control of Horizontal Axis Wind Turbines http://link.aip.org/link/doi/10.1115/1.4005376 Fredrik Sandquist, Geir Moe, and Olimpo Anaya-Lara<br/> An individual pitch controller (IPC) based on the multivariable Linear Quadratic Gaussian (LQG) concept is presented to reduce loads in megawatt-size wind turbines. Most turbines currently installed use collective pitch control to pitch the blades in order to limit the excess of wind power and to re ... [J. Offshore Mech. Arct. Eng. 134, 031901 (2012)] published Wed Feb 1, 2012. On the Vortex-Induced Vibration Response of a Model Riser and Location of Sensors for Fatigue Damage Prediction http://link.aip.org/link/doi/10.1115/1.4005193 C. Shi, L. Manuel, M. A. Tognarelli, and T. Botros<br/> This study is concerned with vortex-induced vibration (VIV) of deepwater marine risers. Riser response measurements from model tests on a densely instrumented long, flexible riser in uniform and sheared currents offer an almost ideal setup for our work. Our objectives are two-fold: (i) we use the me ... [J. Offshore Mech. Arct. Eng. 134, 031802 (2012)] published Thu Feb 2, 2012. Experimental Investigation of Invar Edge Effect in Membrane LNG Tanks http://link.aip.org/link/doi/10.1115/1.4005183 Mateusz Graczyk, Kjetil Berget, and Joachim Allers<br/> Sloshing, a violent fluid motion in tanks is of current interest for many branches of the industry, among them gas shipping. Although different methods are commonly combined for analyzing sloshing in liquid natural gas (LNG) carriers, time histories of the pressure in the tanks are most reliably obt ... [J. Offshore Mech. Arct. Eng. 134, 031801 (2012)] published Wed Feb 1, 2012. An Experimental and Numerical Study on the Axial Compression Response of Flexible Pipes http://link.aip.org/link/doi/10.1115/1.4005181 Jose Renato M. de Sousa, Paula F. Viero, Carlos Magluta, and Ney Roitman<br/> This paper deals with a nonlinear three-dimensional finite element (FE) model capable of predicting the mechanical response of flexible pipes subjected to axisymmetric loads focusing on their axial compression response. Moreover, in order to validate this model, experimental tests are also described ... [J. Offshore Mech. Arct. Eng. 134, 031703 (2012)] published Thu Feb 2, 2012. Resonant Bending Fatigue Test Setup for Pipes With Optical Displacement Measuring System http://link.aip.org/link/doi/10.1115/1.4005182 Jeroen Van Wittenberghe, Patrick De Baets, Wim De Waele, Wouter Ost, Matthias Verstraete, and Stijn Hertele<br/> Pipes and tubular members are used in offshore applications as structural elements, such as columns or in transport pipelines, risers, etc. When subjected to dynamic loads, weld defects or geometrical stress raisers can initiate fatigue cracks, causing the columns or pipelines to fail prematurely. I ... [J. Offshore Mech. Arct. Eng. 134, 031702 (2012)] published Wed Feb 1, 2012. A Comparative Wet Collapse Buckling Study for the Carcass Layer of Flexible Pipes http://link.aip.org/link/doi/10.1115/1.4005185 Alfredo Gay Neto and Clovis de Arruda Martins<br/> When there is a failure on the external sheath of a flexible pipe, a high value of hydrostatic pressure is transferred to its internal plastic layer and consequently to its interlocked carcass, leading to the possibility of collapse. The design of a flexible pipe must predict the maximum value of ex ... [J. Offshore Mech. Arct. Eng. 134, 031701 (2012)] published Wed Feb 1, 2012. Buckling of Unstiffened Steel Cones Subjected to Axial Compression and External Pressure http://link.aip.org/link/doi/10.1115/1.4004953 J. Blachut and O. Ifayefunmi<br/> This is the first study into elastic-plastic buckling of unstiffened truncated conical shells under simultaneously acting axial compression and an independent external pressure. This is both a numerical and experimental study. Domains of combined stability are obtained using the finite element metho ... [J. Offshore Mech. Arct. Eng. 134, 031603 (2012)] published Mon Feb 6, 2012. Fatigue of Tubular Joints: Hot Spot Stress Method Revisited http://link.aip.org/link/doi/10.1115/1.4005188 Pingsha Dong and Jeong K. Hong<br/> A series of well-known tubular joints tested in UKSORP II have been re-evaluated using the mesh-insensitive structural stress method as a part of the on-going Battelle Structural Stress JIP efforts. In this report, the structural stress based analysis procedure is first presented for applications in ... [J. Offshore Mech. Arct. Eng. 134, 031602 (2012)] published Thu Feb 2, 2012. Critical Situations of Vessel Operations in Short Crested SeasForecast and Decision Support System http://link.aip.org/link/doi/10.1115/1.4004515 Gunther F. Clauss, Sascha Kosleck, and Daniel Testa<br/> The encounter of extreme waves, extreme wave groups, or unfavorable wave sequences poses dangerous threats for ships and floating/stationary marine structures. The impact of extreme waves causes enormous forces, whereas an unfavorable wave sequencenot necessarily extreme wavescan arouse critical mot ... [J. Offshore Mech. Arct. Eng. 134, 031601 (2012)] published Thu Feb 2, 2012. The Influence of Mechanical and Laser Cutting on the Fatigue Strengths of Square Hollow-Section Welded T-Joints http://link.aip.org/link/doi/10.1115/1.4005186 R. Moazed and R. Fotouhi<br/> T-joint connections are commonly encountered in many machine components and load carrying members. The T-joint connections can be fabricated using traditional cutting (machine or flame) or by laser cutting techniques. The present study investigates the feasibility of using laser cutting to produce w ... [J. Offshore Mech. Arct. Eng. 134, 031401 (2012)] published Fri Feb 10, 2012. Potential Flow Theory and Numerical Analysis of Forces on Cylinders Induced by Oscillating Disturbances http://link.aip.org/link/doi/10.1115/1.4005180 Daniel T. Valentine and Farshad Madhi<br/> The complete solution of several two-dimensional potential flow problems are reported that deal with the unsteady flow around circular cylinders. Three of the flows considered are induced by an oscillating disturbance near the cylinder. The three elemental disturbances examined are (1) a pulsating s ... [J. Offshore Mech. Arct. Eng. 134, 031301 (2012)] published Wed Feb 1, 2012.