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Research Papers

Active Control of a Very Large Floating Beam Structure

[+] Author and Article Information
Jia Sheng Yang

Center of Maritime Studies,
National University of Singapore,
118414, Singapore
e-mail: cmsyngj@nus.edu.sg

Rui Ping Gao

Department of Civil and Environmental Engineering,
National University of Singapore,
117576, Singapore
e-mail: gaoruiping@nus.edu.sg

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received July 27, 2015; final manuscript received November 15, 2015; published online January 21, 2016. Assoc. Editor: Walter Lacarbonara.

J. Vib. Acoust 138(2), 021010 (Jan 21, 2016) (7 pages) Paper No: VIB-15-1285; doi: 10.1115/1.4032039 History: Received July 27, 2015; Revised November 15, 2015

In this paper, a novel boundary control method is investigated to suppress the vertical vibration of a very large floating structure (VLFS) with regular waves. The VLFS can be described as a distributed parameter system with partial differential equation (PDE). The proposed boundary controllers are developed based on Lyapunov's direct method to act on the upstream and downstream ends of the VLFS, respectively. Along with the suitable choice of control parameters, the proposed controllers could stabilize the vertical vibration of the VLFS subjected to regular waves. This study verifies the effectiveness of the proposed control methods to the VLFS. Then, the effects of wave amplitude and bending rigidity on the hydroelastic response of the VLFS are investigated.

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Figures

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Fig. 1

A very large-scale floating structure with mooring system

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Fig. 2

A VLFS simulated by elastic beam on elastic foundation

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Fig. 3

Comparison of displacement responses of the VLFS between no control and the proposed control: (a) no control and (b) boundary control

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Fig. 4

Boundary control forces acting on the VLFS with the proposed control

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Fig. 5

Displacement response of the VLFS at different positions: (a) 5000 m, (b) 4000 m, (c) 3000 m, (d) 2000 m, (e) 1000 m, and (f) 0 m

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Fig. 6

RMS displacements with variation of wave amplitudes induced by no control and the proposed boundary control: (a) no control and (b) boundary control

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Fig. 7

RMS displacements with variation of bending rigidity induced by no control and the proposed boundary control: (a) no control and (b) boundary control

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