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Technical Brief

First Step Toward the Codesign of Planing Craft and Active Control Systems

[+] Author and Article Information
Esteban L. Castro-Feliciano

Department of Naval Architecture and
Marine Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: eslucafe@umich.edu

Jing Sun

Department of Naval Architecture and
Marine Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: jingsun@umich.edu

Armin W. Troesch

Department of Naval Architecture and
Marine Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: troesch@umich.edu

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 22, 2015; final manuscript received August 25, 2016; published online November 29, 2016. Editor: Solomon Yim.

J. Offshore Mech. Arct. Eng 139(1), 014501 (Nov 29, 2016) (8 pages) Paper No: OMAE-15-1073; doi: 10.1115/1.4034761 History: Received July 22, 2015; Revised August 25, 2016

This paper takes a novel approach to the design of planing craft with active control systems (ACS) by codesigning the longitudinal center of gravity (lcg) and ACS, and compares its performance with a vessel where the lcg and ACS are designed sequentially (traditional approach). The vessels investigated are prismatic in shape. The ACS are modeled as forces on the vessel. The ACS controller is a linear quadratic regulator (LQR) designed using a reduced-order model of the vessel. In the design, only the calm-water drag is optimized. The simulated codesigned vessel had 10% lower calm water and mean seaway drag than the sequentially designed vessel. However, the codesigned vessel's seakeeping was poorer—vertical acceleration doses 25% higher. Results indicate that the traditional sequential design approach does not fully exploit the synergy between a planing craft and its ACS; as a first step, the stability constraints should be relaxed in the design exploration, and the ACS should be considered early in the design stage.

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Figures

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Fig. 1

Prismatic planing craft

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Fig. 2

Calm-water L/D for Cv = 4.5 and β = 5 deg

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Fig. 3

Lift-to-drag contour from Faltinsen method results

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Fig. 4

Relative change in lift-to-drag, controllability index, and trim from traditional to codesigned vessel (Faltinsen method)

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Fig. 5

Closed-loop nonlinear results for Cv = 4 and β = 10 deg (Faltinsen method)

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Fig. 6

Lift-to-drag contour from POWERSEA method results and relative change in lift-to-drag

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Fig. 7

Seakeeping POWERSEA results

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