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Offshore and Structural Mechanics

Characteristic Analysis of VIV-Induced Fatigue Damage of Top Tensioned Risers Based on Simplified Model

[+] Author and Article Information
Hongxiang Xue1

State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, Chinahongxiangxue@sjtu.edu.cn

Jinting Guo

Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI 48109

Wenyong Tang, Shengkun Zhang

State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

1

Corresponding author.

J. Offshore Mech. Arct. Eng 133(2), 021304 (Feb 23, 2011) (7 pages) doi:10.1115/1.4002046 History: Received May 25, 2010; Revised June 09, 2010; Published February 23, 2011; Online February 23, 2011

In this study, a simplified empirical model for fatigue analysis of top-tensioned risers due to vortex-induced vibration (VIV) in a nonuniform current is presented. Compared with previous studies on this subject, this model is able to take into account the main intrinsic nature of VIV for low mass ratio structures in lock-in regions, added mass, and nonlinear fluid damping. Based on the simplified model, a closed-form solution of fatigue damage is suggested for the case of a riser with uniform mass and cross-section oscillating in a uniform flow. Fatigue damage characteristics of the top-tensioned risers due to VIV are investigated to determine the effects of various ocean conditions and riser dimensions on fatigue damage.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

The extent of lock-in region as a function of m∗

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Figure 2

Power-in and damping regions of a riser

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Figure 3

Uniform riser excited by stratified flow

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Figure 4

Stepped riser excited by uniform flow

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Figure 7

Fatigue damage components of each mode

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Figure 6

Fatigue damage under different current velocity profiles along the riser

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Figure 5

1 year return period currents velocity profiles

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