Results 131 to 140 of about 1,207,140 (178)

Development of an Instrumented Marine Riser Joint

Journal of Energy Resources Technology, 1982
A marine riser pup joint was instrumented to measure riser tension, bending moment, and mud temperature and pressure. The ground rules for the design, major design decisions, significant details, and calibration and testing are discussed.
J. L. Evans, D. A. Ganser, S. J. Williams   +2 more
openaire   +1 more source

Coupled Nonlinear Flexible Marine Riser

2014
In Chap. 7, boundary control for a coupled nonlinear flexible marine riser with two actuators in transverse and longitudinal directions is developed to reduce the riser’s vibrations. The dynamic behavior of the flexible riser is represented by a distributed-parameter system (DPS) model with partial differential equations (PDEs), and the control is ...
Wei He, Shuzhi Sam Ge, Bernard Voon Ee How, Yoo Sang Choo   +3 more
openaire   +1 more source

SUPERVISORY SWITCHED CONTROL OF MARINE RISERS

IFAC Proceedings Volumes, 2007
Abstract For a riser array in deep waters interference between individual risers exposed to strong ocean current and/or large TLP motions is of concern. The lateral deflections are likely to be large, and the risers may experience collision with fatigue or surface damage as a consequence.
Anne M. Rustad, Asgeir J. Sørensen, Carl M. Larsen   +2 more
openaire   +1 more source

The Evolved Motions of a Marine Riser or Pipeline

Volume 4: Pipelines, Risers, and Subsea Systems, 2021
Abstract Analytical, experimental and computational models have historically been heavily simplified, linearized, and otherwise reduced. This paper shows how such model reductions eliminate the fundamental geometric changes that determine real behavior in cables, strings, moorings, guys, pipelines, riser, plates, skins, subsea hulls, and
openaire   +1 more source

Dynamic analysis of a marine riser

2008
The problem of the dynamic analysis of a marine riser is considered in this thesis. The equations of motion for a marine riser undergoing large three dimensional deflections and rotations are derived using modal discretization approach. The nonlinear expressions for the bending and torsional deformations are obtained for a beam undergoing finite ...
openaire   +1 more source

An Approach to VIV Design of Marine Risers

Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design, 2007
This paper presents an approach to vortex-induced vibration (VIV) design of marine risers. It begins with a brief review of the issue and then proceeds to presenting the key elements needed to make VIV predictions for marine risers. Uncertainties and discrepancies between model prediction and field measurements are discussed.
Li Lee, Don W. Allen
openaire   +1 more source

Evolutionary Design of Marine Riser Systems

23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B, 2004
It is said that nature attempts to solve the ‘problem of life’ through evolution. ‘Solutions’ are proposed which are then tested in the world around us. Natural selection ensures that the best characteristics are inherited by subsequent generations. This paper gives details of a new method of automated riser design and optimization using techniques ...
Nicholas Cunliffe, Carl Baxter, Timothy McCarthy, Andrew Trim   +3 more
openaire   +1 more source

Natural Frequencies of Marine Drilling Risers

Journal of Petroleum Technology, 1976
This paper gives the mathematical basis for determining natural frequencies and corresponding mode shapes for marine drilling risers. Numerical results relate natural frequencies to riser parameters; the data cover risers operating within 600 ft of water. An approximate method is given for establishing marine-riser natural frequencies.
D.W. Dareing, T. Huang
openaire   +1 more source

Finite-element analysis of the marine riser

Engineering Structures, 1984
Abstract A two-dimensional finite-element computational method is presented for determining marine riser displacements and stresses due to self-weight, buoyancy, internal and external pressures, surface vessel motions and environmental forces arising from currents and waves. A dynamic analysis is performed in the frequency domain for regular waves by
M.H. Patel, S. Sarohia, K.F. Ng
openaire   +1 more source

Development Of A Flexible Marine Riser System

Offshore Technology Conference, 1986
Abstract Various uses including energy transportation can be considered for the flexible marine riser system. We had an opportunity of studying on a new marine riser system for electric power transmission cable, participating in the power generating system experiment program of Japan Marine Science
K. Ishii, T. Okamoto, N. Tachibana
openaire   +1 more source