Investigation of Seakeeping Characteristics of High-Speed Catamarans in Waves

Fang, Chih-Chung; Chan, Hoi-Sang

doi:10.51400/2709-6998.2215

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…A normalised MSI of about 0.5 is found in both headings at low speed (15–20 knots, Fr ≈ 0.3) (Figure 7(a)), while it is around 0.9 at high speed (30–35 knots, Fr ≈ 0.6) (Figure 7(b). This agrees with the prediction of Fang and Chan 16 that the WPC heave response was consistent in the range of headings 180 ° ± 45 ° at the same forward velocity.…”

Section: Resultssupporting

confidence: 91%

“…A normalised MSI of about 0.5 is found in both headings at low speed (15-20 knots, Fr≈0.3) (Figure 7 (a)), while it is around 0.9 at high speed (30-35 knots, Fr≈0.6) (Figure 7 (b). This agrees with the prediction of Fang and Chan 16 that the WPC heave response was consistent in the range of headings 180°± 45° at the same forward velocity. In a previous study by the authors using the same sea trials data 38 , which analysed the single speed of 35 knots, the MSI in bow-quartering seas was found to be generally only half of that in head seas.…”

Section: Motion Sickness Incidence At Different Headingssupporting

confidence: 92%

“…To determine the operability or seaworthiness of a vessel, it is important to understand its motion while encountering waves. The most common indicator of the vessel motion is the Response Amplitude Operator (RAO), which can represent the motion response under various wave frequencies [4][5][6][7][8][9][10][11][12] , though the response is somewhat non-linear to the encountered waves [13][14][15][16] . Moreover, to compare the vessel motion response and further quantify passenger comfort, Motion Sickness Incidence (MSI) is analysed.…”

Section: Introductionmentioning

confidence: 99%

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Influence of an active T-foil on motions and passenger comfort of a wave-piercing catamaran based on sea trials in oblique seas

Lau

Ali-Lavroff

Holloway

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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In this paper the influence of a Ride-Control System (RCS) on the Response Amplitude Operator (RAO) of a full-scale high-speed catamaran was investigated using sea trials data. A T-foil and stern tabs were installed on a Wave-Piercing Catamaran (Incat Tasmania Hull 061) to improve ship motions and passenger comfort. More than 40 total effective hours of sea trials were conducted by the US Navy in 2004, encountering sea states 4–5 in the Atlantic Ocean near the United Kingdom. The reduction in Motion Sickness Incidence (MSI) was estimated in order to examine the effectiveness of the RCS in improving passenger comfort. By comparing the case of active RCS (T-foil plus stern tabs) with the case of active stern tabs only, it was found that the T-foil plays a vital role in the passenger comfort enhancement. Based on ISO recommended MSI calculation of a 2-h seaway, the percentage reduction in MSI was estimated, and hence the effectiveness of the T-foil deployment, along with the influence of speeds, headings, location on board and encountered wave height were analysed. A notable improvement in passenger comfort was observed in the real world bow quartering sea by deploying the RCS. An MSI reduction of 21% in high speeds (30–35 knots, [Formula: see text] 0.6) was observed, which was almost twice the MSI reduction (11%) in low speeds (15–20 knots, [Formula: see text] 0.3). However, in terms of MSI percentage reduction, the ability of T-foil in vessel motion control in oblique seas was found to be limited compared to the results in head seas.

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Section: Resultssupporting

confidence: 91%

Section: Motion Sickness Incidence At Different Headingssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Influence of an active T-foil on motions and passenger comfort of a wave-piercing catamaran based on sea trials in oblique seas

Lau

Ali-Lavroff

Holloway

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…Based on the potential flow theory, Fang and Chan predicted the motion responses (including heave, pitch, and roll) of the Wave Piercing Catamaran (WPC) in regular and irregular waves. The numerical results are in good agreement with the experimental data obtained in SSPA [9]. Based on the linear potential flow theory, Ma and Wan studied the nonlinear effects of heave and trim motion, wave resistance of four buoyant hull types (Wigley, S60, DTMB5415, KCS) sailing in still water.…”

Section: Introductionsupporting

confidence: 72%

Numerical Simulation of the Motion of a Large Scale Unmanned Surface Vessel in High Sea State Waves

Huang

Liu

Luo

et al. 2021

JMSE

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The motion stability of the Unmanned Surface Vessel (USV) is threatened by the action of waves under a rough sea state. In the present paper, the motion of a large-scale USV is numerically simulated under high sea state of level 5 and 7. The overset grid method and Reynolds Averaged Navier–Stokes (RANS) approach are employed to solve Navier–Stokes (N-S) equations. For the case of wave incident angle 0° and 30°, the heave, pitch and roll motion response of a large scale USV are investigated by using the six Degrees of Freedom (6-DOF) numerical model. The effects of different sea states, as well as different wave directions, on the motion of USV are compared. The comparative results indicate that the response of this USV in waves is the periodic free-motion according to the corresponding amplitude, which does not exceed the stable range, and there are no overturning and other situations that may affect the safety, in the case of level 5 and 7 sea states. The corresponding pressure at the bottom of this USV meets the range of material strength, and no structural damage or injury to the hull occurs, although the pressure varies at different wave periods. For the case of different wave directions, the analysis of the boundary layer thickness shows that the wave direction is of great importance to the boundary layer thickness distribution, both in the level 5 and level 7 sea states.

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“…There is a wide range of research papers that report on the frequency dependent motions of WPCs in waves, including slamming and seakeeping performance [10][11][12][13][14][15][16][17][18][19]. According to Fang and Chan [20], WPCs show excellent seakeeping characteristic relative to conventional catamarans in oblique sea, based on model test and numerical results of a 41 m WPC at 20 knots. As a leader in the design and manufacture of aluminium WPCs, Incat Tasmania constantly seeks the most optimised and refined system that can be used to further enhance the operability of their design through the installation of ride-control systems (RCS) and centre bow [7,11,13,17,[20][21][22][23][24].…”

Section: Wave-piercing Catamarans (Wpcs)mentioning

confidence: 99%

Influence of an active T-foil on motions and passenger comfort of a large high-speed wave-piercing catamaran based on sea trials

et al. 2022

View full text Add to dashboard Cite

T-foil and stern tabs were installed on a wave-piercing catamaran (Incat Tasmania Hull 061) to improve ship motions and passenger comfort. More than 40 total effective hours of sea trials were conducted by the US Navy in 2004, encountering sea states 4–5 in the Atlantic Ocean near the United Kingdom. In this paper the influence of a ride-control system (RCS) on the heave and pitch response amplitude operator (RAO) of the full-scale high-speed catamaran was investigated using the sea trial data. The reduction in motion sickness incidence (MSI) was estimated in order to examine the effectiveness of the RCS in improving passenger comfort. With the existing control algorithm, the vertical accelerations were found to be best controlled by the active T-foil working together with the active stern tabs, while the pitch RAO was mainly mitigated by deploying only the stern tabs. About a 23% reduction was observed in the peak heave RAO with deployment of an active T-foil. The MSI can be reduced by up to 23% with respect to the cases with stern tabs only, depending on the encountered wave conditions, based on ISO recommendation for MSI calculation of a 2-h seaway passage.

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Investigation of Seakeeping Characteristics of High-Speed Catamarans in Waves

Cited by 10 publications

References 2 publications

Influence of an active T-foil on motions and passenger comfort of a wave-piercing catamaran based on sea trials in oblique seas

Influence of an active T-foil on motions and passenger comfort of a wave-piercing catamaran based on sea trials in oblique seas

Numerical Simulation of the Motion of a Large Scale Unmanned Surface Vessel in High Sea State Waves

Influence of an active T-foil on motions and passenger comfort of a large high-speed wave-piercing catamaran based on sea trials

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