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TECHNICAL PAPERS

FNPF Analysis of Stochastic Experimental Fluid-Structure Interaction Systems

[+] Author and Article Information
Solomon C. Yim1

Department of Civil Engineering, Oregon State University, Corvallis, OR 97331

Huan Lin

Department of Civil Engineering, Oregon State University, Corvallis, OR 97331

Katsuji Tanizawa

 National Maritime Research Institute, Tokyo, Japan

1

Corresponding author.

J. Offshore Mech. Arct. Eng 129(1), 9-20 (Sep 01, 2006) (12 pages) doi:10.1115/1.2426990 History: Received September 29, 2005; Revised September 01, 2006

A two-dimensional fully nonlinear potential flow model is employed to investigate nonlinear stochastic responses of an experimental fluid-structure interaction system that includes both single-degree-of-freedom surge-only and two-degree-of-freedom surge-heave coupled motions. Sources of nonlinearity include free surface boundary, fluid-structure interaction, and large geometry in the structural restoring force. Random waves performed in the tests include nearly periodic, periodic with band-limited noise, and narrow band. The structural responses observed can be categorized as nearly deterministic (harmonic, sub- and super-harmonic), noisy periodic, and random. Transition phenomena between coexisting response attractors are also identified. An implicit boundary condition upholding the instantaneous equilibrium between the fluid and structure using a mixed Eulerian-Lagrangian method is employed. Numerical model predictions are calibrated and validated via the experimental results under the three types of wave conditions. Extensive simulations are conducted to identify the response characteristics and the effects of random perturbations on nonlinear responses near primary and secondary resonances.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental SDOF model of a submerged, hydrodynamically damped and excited nonlinear structural system

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Figure 2

Experimental 2DOF model of a submerged, hydrodynamically damped and excited nonlinear structural system

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Figure 3

Two-dimensional numerical wave tank model of a moored, submerged sphere subjected to random waves

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Figure 4

Transition from SDOF harmonics to subharmonics (test D2): (a) wave profile and (b) sphere displacement

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Figure 5

Sample 2DOF results near subharmonic resonance (test E9): (a) periodic waves with additive noise, (b) noisy surge, and (c) noisy heave

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Figure 6

2DOF experimental results near super-harmonic resonance (test E14): (a) periodic waves with additive noise, (b) noisy surge, and (c) noisy heave response

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Figure 7

Comparison of nearly periodic wave profile and super-harmonic responses (test E4): (a) wave profile, (b) surge, and (c) heave displacement; solid line—experimental and dashed line—simulated

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Figure 8

Comparison of SDOF noisy experimental and simulated results in power spectrum near subharmonic resonance (test D6): (a) waves and (b) surge response

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Figure 9

Comparison of 2DOF noisy experimental and simulated results in power spectrum near super-harmonic resonance (test E14): (a) waves and (b) surge response

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Figure 10

Comparison of SDOF narrow-band experimental and simulated results in power spectrum (test D16): (a) waves and (b) surge

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Figure 11

Response variance versus noise-and-signal ratio near subharmonic resonance: (a) SDOF and (b) 2DOF

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Figure 12

Response variance versus noise-and-signal ratio near super-harmonic resonance (2DOF)

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