Experimental investigation of T-foil hybrid control strategy for ship motion reduction in head seas

Jiang, Yichen; Bai, Junyu; Liu, Shijie; Zong, Zhi; Li, Peng

doi:10.1016/j.oceaneng.2021.110251

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…The T-foil can improve the additional mass and damping of the hull, and the flap is used to change the longitudinal inclination of the hull. 3 The high-speed multihull ship with T-foil and flap is a multi-input and multi-output system with a strong coupling between heave and pitch motions. The high speed leads to dramatic changes in hydrodynamic parameters and the model has fast time-varying, strong uncertainty, and so on characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Anti-pitching of high-speed multihull ships based on incremental predictive control

Zhang

Zhong

2023

Proceedings of the Institution of Mechanical Engineers, Part I:

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In order to enhance the suppression ability of high-speed multihulls against wave disturbance and reduce the amplitude of vertical motion, it is necessary to use two types of appendages, active T-foil and flap, to implement closed-loop anti-pitching. Aiming at the problems of sea wave disturbance and appendages input constraints, an anti-pitching scheme based on incremental predictive control is proposed. First, the vertical coupled motion model of the high-speed multihull ship is established, the frequency-domain and time-domain characteristics of random wave disturbance are analyzed, and the wave disturbance force and moment are estimated based on the integral disturbance model. On this basis, the incremental model of multihull vertical motion that includes the change rate of wave disturbance is used as the prediction model to reduce the influence of the average wave disturbance force and disturbance moment on vertical motion, improve the model prediction accuracy, and introduce the amplitude and change rate of heave and pitch into the objective function to minimize both. At the same time, in order to solve the input constraints of the anti-pitching appendages and reduce the amount of online calculation, the Lagrange multiplier method and the stair-like parameterization strategy are used to derive the analytical anti-pitching predictive control law and analyze the stability of the closed-loop system. The simulation results show that the proposed incremental predictive control effectively reduces the change rate and amplitude of heave and pitch, the heave displacement is reduced by 43.51%, and the pitch angle is reduced by 50.88%.

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Section: Introductionmentioning

confidence: 99%

“…The T-foil can improve the additional mass and damping of the hull, and the flap is used to change the longitudinal inclination of the hull. 3…”

Section: Introductionmentioning

confidence: 99%

Anti-pitching of high-speed multihull ships based on incremental predictive control

Zhang

Zhong

2023

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…Lau et al restricted the vertical motion of the vessel on a wave piercing catamaran by installing a T-foil and stern tabs, lowering motion sickness incidence (MSI) and enhancing passenger comfort [18]. Based on a hybrid control method, Jiang et al presented a T-foil that can greatly improve the seakeeping performance of a high-speed trimaran [19].…”

Section: Introductionmentioning

confidence: 99%

Design Longitudinal Control System Using Suitable T-Foil Modeling for the Offshore Wind Power Operation and Maintenance Vessel with Severe Sea States

Yuan,

Liu,

Geng

et al. 2023

JMSE

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In order to reduce the offshore wind power operation and maintenance vessel motion induced by severe sea states, a suitable stabilizer with the ship based on linear quadratic regulator strategy is proposed in this paper. First of all, the dynamics of the ship motion model are established to study the longitudinal control system. The six degrees of freedom nonlinear motion model and nonlinear coupled longitudinal motion (heave and pitch) model are described in detail in this paper. Secondly, this work presents matching suitability between the T-foil and the operation and maintenance vessel. Therefore, the most suitable installation position and the optimum strut’s height of T-foil are determined by meshing the ship hull model, setting the water channel, and a series of corresponding computer fluid dynamic simulation. Following that, the linear quadratic regulator controller is studied with active longitudinal control system based on the suitable T-foil. Furthermore, a longitudinal control system is built, including free vessel module and the suitable T-foil stabilizer-based proposed controller module. Finally, the simulation results indicate that the designed T-foil and the longitudinal control system are feasible and effective to ensure the heave and pitch motion reduction based on the proposed controller.

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The retrofitting of ships by applying retractable bow hydrofoils: a case study

Niklas

Pruszko

2023

J. Ocean Eng. Mar. Energy

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Increasing environmental requirements and a relatively long ship life of 30 years mean more attention is needed to retrofit existing ships. One possibility is using hydrofoils to reduce the ship’s resistance and improve comfort and safety in rough sea conditions. This study investigates the influence of retractable bow hydrofoils on the seakeeping performance and operational conditions of a selected case study vessel (V-shaped bulbous bow). The methods used were full-scale computational fluid dynamics (CFD) simulations and towing tank experiments for validation. The analysis was conducted for bow waves of different lengths and a ship’s operating speed. The most beneficial effect of hydrofoils was observed for wavelengths from λ/LWL = 1.0 to λ/LWL = 1.2. For the wavelength λ/LWL = 1.2, the reduction of heave motion was equal to 33%, pitch motion was equivalent to 28%, and the reduction of wave-added resistance was equal to 25%. The analysis also showed unfavourable conditions for which hydrofoil folding is needed to avoid causing an excessive increase in resistance. A generalized procedure has been developed to assess the potential for resistance and motion reduction by retrofitting existing ships using hydrofoils.

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Experimental investigation of T-foil hybrid control strategy for ship motion reduction in head seas

Cited by 11 publications

References 17 publications

Anti-pitching of high-speed multihull ships based on incremental predictive control

Anti-pitching of high-speed multihull ships based on incremental predictive control

Design Longitudinal Control System Using Suitable T-Foil Modeling for the Offshore Wind Power Operation and Maintenance Vessel with Severe Sea States

The retrofitting of ships by applying retractable bow hydrofoils: a case study

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