Journal of Offshore Mechanics and Arctic Engineering: Recent submissions
Now showing items 801-820 of 2185
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“Bigfoot†Direct Vertical Access Semisubmersible Model Tests and Comparison With Numerical Predictions
(The American Society of Mechanical Engineers (ASME), 2016)The Bigfoot direct vertical access (DVA) semisubmersible is a novel floating drilling and production host that provides an attractive alternative to the spar. This concept utilizes heave plates (big feet) that improve the ... -
Improvement of Performance of Wave Power Conversion Due to the Projecting Walls for Oscillating Water Column Type Wave Energy Converter
(The American Society of Mechanical Engineers (ASME), 2016)This paper describes a method to improve the performance of primary conversion of wave power takeoff. The wave energy converter (WEC) used here was of oscillating water column (OWC) type. This method for improvement has ... -
Strength of a Container Ship in Extreme Waves Obtained by Nonlinear Hydroelastoplasticity Dynamic Analysis and Finite Element Modeling
(The American Society of Mechanical Engineers (ASME), 2016)Extreme waves have caused a lot of ship accidents and casualties. In this paper, a twodimensional (2D) hydroelastoplasticity method is proposed to study the nonlinear dynamic responses of a container ship in extreme waves. ... -
Analytical and Numerical Study of Nearshore Multiple Oscillating Water Columns
(The American Society of Mechanical Engineers (ASME), 2016)In the present study, the performance of two chamber nearshore oscillating water columns (OWCs) in finite water depth is analyzed based on the linearized water wave theory in the twodimensional Cartesian coordinate systems. ... -
Probabilistic Performance Assessment of Fiber Optic Leak Detection Systems
(The American Society of Mechanical Engineers (ASME), 2016)Leak detection systems (LDSs) play a major role in enhancing reliability and operability of oil and gas pipelines. They have the functional capabilities to detect, locate, and quantify leaks before they can cause devastating ... -
Flow Induced Vibration in Subsea Jumper Subject to Downstream Slug and Ocean Current
(The American Society of Mechanical Engineers (ASME), 2016)This paper presents a multiphysics approach for characterizing flowinduced vibrations (FIVs) in a subsea jumper subject to internal production flow, downstream slug, and ocean current. In the present study, the physical ... -
Fatigue Strength Assessment on a Multiplanar Tubular KK Joints by Scaled Model Test
(The American Society of Mechanical Engineers (ASME), 2016)Multiplanar tubular KKjoints are one of the most popular joint types in offshore structures, which are exposed to cyclic loads and fatigue damages. In this paper, a fatigue prediction method based on scaled model test is ... -
Improvements on the Numerical Analysis of the Coupled Extensional–Torsional Response of a Flexible Pipe
(The American Society of Mechanical Engineers (ASME), 2016)In this paper, the coupled extensional–torsional behavior of a 4 in. flexible pipe is studied. The pipe is subjected to pure tension and two different boundary conditions are considered: ends free and prevented from ... -
Long Term Extreme Load Prediction of Spar and Semisubmersible Floating Wind Turbines Using the Environmental Contour Method
(The American Society of Mechanical Engineers (ASME), 2016)The prediction of extreme loads for the offshore floating wind turbine is analyzed based on the inverse reliability technique. The inverse reliability approach is in general used to establish the design levels associated ... -
Simplified Finite Element Models to Study the Dry Collapse of Straight and Curved Flexible Pipes
(The American Society of Mechanical Engineers (ASME), 2016)Dry collapse is one of the possible failure modes of flexible pipes. It refers to the situation in which no damage occurs in the flexible pipe external sheath. In this scenario, all layers of the pipe withstand the external ... -
Experimental Investigation of the Effect of Cyclic Loading on Spudcan Extraction
(The American Society of Mechanical Engineers (ASME), 2016)Selfelevating mobile jackup units have been employed in offshore exploration and development in shallow waters at depths of up to approximately 150 m. Jackups are designed to move to a new site after operations are ... -
Hydrodynamic Forces and Flow Structures in Flow Past a Cylinder Forced to Vibrate Transversely and Inline to a Steady Flow
(The American Society of Mechanical Engineers (ASME), 2016)This paper reports computational results of forces and wake structure in twodimensional flow past a circular cylinder forced to vibrate both transversely and inline to a uniform stream, following a figureeight trajectory. ... -
Data Mining Pt. Reyes Buoy for Rare Wave Groups
(The American Society of Mechanical Engineers (ASME), 2016)This paper addresses the existence of rare wave groups by examining time series data from the Pt. Reyes buoy. The buoy is operated by the Coastal Data Information Program (CDIP), University of California San Diego. The ... -
Quasi Static Analysis of the Multicomponent Mooring Line for Deeply Embedded Anchors
(The American Society of Mechanical Engineers (ASME), 2016)Multicomponent taut mooring lines are widely used to secure floating facilities to anchors embedded in the seabed to restrict motions. Optimal design of the mooring line system requires a realistic model of the combined ... -
Three Dimensional Oscillation Dynamics of the In Situ Piston Rod Transmission Between Buoy Line and the Double Hinge Connected Translator in an Offshore Linear Wave Energy Converter
(The American Society of Mechanical Engineers (ASME), 2016)Force and displacement measurements have been performed in situ on the piston rod mechanical leadthrough transmission in the direct drive of the second experimental wave energy converter (WEC) 3 km offshore at the Lysekil ... -
A Modified Matlock–Duffing Model for Two Dimensional Ice Induced Vibrations of Offshore Structures With Geometric Nonlinearities
(The American Society of Mechanical Engineers (ASME), 2016)Oil and gas exploration and production have been expanding in Arctic waters. However, numerical models for predicting the iceinduced vibrations (IIV) of offshore structures are still lacking in the literature. This study ... -
Numerical Simulations of an Oscillating Flow Past an Elliptic Cylinder
(The American Society of Mechanical Engineers (ASME), 2016)This paper presents a numerical investigation of a twodimensional (2D) oscillatory flow around a cylinder of different elliptic ratios, in order to study the effect of the elliptic form of the cylinder on the vorticity ... -
Optimal Design of Wire Sheave Used in Offshore Drilling Operations
(The American Society of Mechanical Engineers (ASME), 2016)This paper presents optimized design geometries of wire sheaves that are used in offshore drilling operations. Seven different design geometries of wire sheaves are considered for this study. The criteria considered in ... -
Effects of Fluid Motions in Liquid Tanks on Vessel Motions Using a Simple Panel Method1
(The American Society of Mechanical Engineers (ASME), 2016)This paper presents a simple and fast method to include the effect of liquid tanks of a vessel in the prediction of the vessel motions. The effects are expressed in terms of modifications to the added mass and stiffness ... -
Study on Multimode Vortex Induced Vibration of Deepwater Riser in Different Flow Fields by Finite Element Simulations
(The American Society of Mechanical Engineers (ASME), 2016)Multimode vortexinduced vibration (VIV) of slender risers, respectively, in stepped and shear flows is explored by finite element simulations. Taking account of the interaction between fluid and structure, a hydrodynamic ...