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TECHNICAL PAPERS

Three-Dimensional Time-Domain Analysis of Very Large Floating Structures Subjected to Unsteady External Loading

[+] Author and Article Information
Qiu Liuchao, Liu Hua

School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai 200030, People’s Republic of China

J. Offshore Mech. Arct. Eng 129(1), 21-28 (Jun 03, 2006) (8 pages) doi:10.1115/1.2355511 History: Received March 02, 2005; Revised June 03, 2006

The strong interest in very large floating structure (VLFS) is a result of a need to utilize effectively the ocean space for transportation, industrial use, storage, habitats, and military bases, among others. The VLFS has great width and length and relatively small flexural rigidity, therefore, investigation of its hydroelastic behavior including fluid-structure interaction is of greater importance than studies of its motion as rigid bodies. In addition to the most important wave-induced responses, the operation of the VLFS also requires determination of its dynamic responses with respect to the effect of unsteady external loading due to intense traffic, load movement, takeoffs and landings of airplanes, missile takeoffs, etc. Therefore, the transient responses of a VLFS to impulsive and moving loads must be studied by a reliable calculation method. In this study, a finite element procedure developed directly in time domain for solution of transient dynamic response of the coupled system consists of a VLFS and a fluid domain subjected to arbitrary time-dependent external loads is presented. The hydrodynamic problem is formulated based on linear, inviscid, and slightly compressible fluid theory and the structural response is analyzed under the thin plate assumption. For numerical calculations, a scaled model of the Mega-Float is exemplified. Three tests—weight pull-up test, weight drop test, and weight moving test which idealize the airplane landing and takeoff—are carried out and compared with published experimental data. The overall agreement was favorable which indicates the validation of the present method.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Definition sketch of the problem

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Figure 2

Schematic diagram of the axisymmetric problem

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Figure 4

Time variations of the free-surface elevation at different time due to different type of excitation

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Figure 11

Perspective view of the structural deflection due to weight movement

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Figure 10

Time history of the vertical displacement in weight moving test

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Figure 9

Time history of the vertical displacement in weight pull-up test

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Figure 8

Perspective view of the structural deflection due to weight drop impact

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Figure 7

Time history of the vertical displacement in weight drop test

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Figure 6

Acceleration of weight during impact onto plate

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Figure 5

Arrangement of measuring points in the test model

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Figure 3

Triangular pulse and its Fourier transformation

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