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Research Papers: Piper and Riser Technology

Multidisciplinary Optimization Design for the Section Layout of Umbilicals Based on Intelligent Algorithm

[+] Author and Article Information
Zhixun Yang

State Key Laboratory of Structural Analysis for
Industrial Equipment,
Department of Engineering Mechanics,
Dalian University of Technology,
Dalian, No. 2 Linggong Road,
Dalian 116023, China
e-mail: yangzhixun@mail.dlut.edu.cn

Qingzhen Lu

State Key Laboratory of Structural Analysis for
Industrial Equipment,
School of Ocean Science and Technology,
Dalian University of Technology,
No. 2 Dagong Road,
Panjin 124221, China
e-mail: luqingzhen@dlut.edu.cn

Jun Yan

State Key Laboratory of Structural Analysis for
Industrial Equipment,
Department of Engineering Mechanics,
International Research Center for Computational
Mechanics,
Dalian University of Technology,
No. 2 Linggong Road,
Dalian 116023, China
e-mail: yanjun@dlut.edu.cn

Jinlong Chen

State Key Laboratory of Structural Analysis for
Industrial Equipment,
Department of Engineering Mechanics,
Dalian University of Technology,
No. 2 Linggong Road,
Dalian 116023, China
e-mail: cjldut@163.com

Qianjin Yue

State Key Laboratory of Structural Analysis for
Industrial Equipment,
School of Ocean Science and Technology,
Dalian University of Technology,
No. 2 Dagong Road,
Panjin 124221, China
e-mail: yueqj@dlut.edu.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 10, 2017; final manuscript received October 22, 2017; published online January 2, 2018. Assoc. Editor: Luis V. S. Sagrilo.

J. Offshore Mech. Arct. Eng 140(3), 031702 (Jan 02, 2018) (12 pages) Paper No: OMAE-17-1106; doi: 10.1115/1.4038580 History: Received July 10, 2017; Revised October 22, 2017

Umbilicals, which link top floaters and subsea devices, provide control functions through electrical cables and hydraulic remote transmission. These cables are considered the “lifeline” of subsea production systems for offshore oil and gas exploitation. Umbilicals should undertake self-weight and periodic loading during operation because of the severe conditions of the ocean environment. Heat is released to the umbilical body during power transmission in electric cables, which influences the mechanical properties and optical transmission in the cable. However, several sectional arrangements can be applied to a number of umbilical components. Thus, sectional layout design with multiple components should be treated as a multidisciplinary optimization problem. From the mechanical point of view, the umbilical structure should be designed with compact and symmetric layout to obtain an even probability of resistance to loads and reduce structural stress, thereby improving fatigue performance. In terms of thermal effect, these electric cables should be arranged to dissipate heat easily and avoid influence on functional and structural components. This study quantifies compactness, symmetry, and temperature distribution by introducing corresponding indices. A multidisciplinary optimization framework is then established. Particle swarm optimization (PSO) intelligent algorithm is adopted to perform optimization and obtain the optimal solution, which is superior to the initial design. The optimization design strategy is proven effective and efficient by a case study, which provides a reference for umbilical design.

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References

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Figures

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Fig. 1

Operation state of a dynamic umbilical

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Fig. 2

Typical structure of a dynamic umbilical

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Fig. 3

Typical helically winding structure

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Fig. 4

Different sectional layouts: (a) sectional layout with a central steel tube and (b) sectional layout with three electrical cables at the center

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Fig. 5

Schematic of the envelope circle shrinking

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Fig. 6

Overlapping depth and elastic force between disks i andj

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Fig. 7

Overlapping depth and elastic force between the envelope circle and disk i

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Fig. 8

Different sectional layouts with six disks: (a) section layout with unequal potential energy and (b) section layout with equal potential energy

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Fig. 9

Pseudo-gravity index of different components: (a) pseudo-gravity index of the steel tube, (b) pseudo-gravity index of the optical cable, and (c) pseudo-gravity index of electrical cables

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Fig. 10

Pseudo-gravity center of the cross section

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Fig. 11

Schematic of the three basic operations

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Fig. 12

Corresponding point arrangement of the sectional layout

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Fig. 13

Geometrical size of the typical umbilical cross section

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Fig. 14

Thermal path model of the cross section

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Fig. 15

Schematic of the heat sources in the umbilical cross section

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Fig. 16

Highest temperature with the increasing average distance and surrounded area of the heat sources

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Fig. 17

Search sketch of the particle swarm

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Fig. 18

Flowchart of the optimization search based on the PSO algorithm

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Fig. 19

(a) Cross section of the steel tube, (b) cross section of the electrical cable, and (c) cross section of the optical cable

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Fig. 20

Local optimal section layouts: (a) local optimal solution 1 and (b) local optimal solution 2

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Fig. 21

Global optimal section layout

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Fig. 22

Temperature distribution in cross section of local solution 1

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Fig. 23

Temperature distribution in cross section of local solution 2

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Fig. 24

Temperature distribution in cross section of global solution

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