The Experts below are selected from a list of 99 Experts worldwide ranked by ideXlab platform
Hiroyuki Yamato - One of the best experts on this subject based on the ideXlab platform.
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The estimation of wave elevation and wave disturbance caused by the wave orbital motion of a fully submerged Hydrofoil Craft
Journal of Marine Science and Technology, 2005Co-Authors: Sang-hyun Kim, Hiroyuki YamatoAbstract:The current control system of a fully submerged Hydrofoil Craft has manual input of fore-foil depth and control mode selection to improve the performance of the control system. However, the manual input needs skillful human operation and observation of waves the encountered to work well over a wide range of waves. In order to use information about the waves encountered in the control system, we considered the estimation of wave elevation and wave disturbance which was caused by the orbital motion of the waves in irregular waves. First, we investigated the wave disturbance by a fully submerged Hydrofoil Craft, in a state-space model of wave disturbance, and in Hydrofoil Craft motion, etc. We than considered estimations of the wave elevation and wave disturbance using a shaping filter, a Kalman filter, an autoregressive (AR) model, etc. Finally, we confirmed through simulations that the estimation results and estimation error of wave elevation and wave disturbance were valid.
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on the design of a longitudinal motion control system of a fully submerged Hydrofoil Craft based on the optimal preview servo system
Ocean Engineering, 2004Co-Authors: Sang-hyun Kim, Hiroyuki YamatoAbstract:The current control system of a fully-submerged Hydrofoil Craft based on optimal feedback control has several problems: it has no good performance of contouring waves and it cannot reduce the effect of wave disturbance. In this paper, we apply the optimal preview servo system to the longitudinal control system of a fully-submerged Hydrofoil Craft in order to settle the problems of current control system. The control system based on optimal preview servo system is composed of feedback controller and feedforward controller. Also in order to design the control system, the necessary prediction range of future information, the weight function in performance index, the future reference input and wave disturbance are determined. Finally, the validity of the proposed control system in this paper is confirmed by simulation. The simulation results show that the control system has good performance of contouring waves in following seas and is effective to settle the problems of current control system of a fully-submerged Hydrofoil Craft.
Sang-hyun Kim - One of the best experts on this subject based on the ideXlab platform.
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The estimation of wave elevation and wave disturbance caused by the wave orbital motion of a fully submerged Hydrofoil Craft
Journal of Marine Science and Technology, 2005Co-Authors: Sang-hyun Kim, Hiroyuki YamatoAbstract:The current control system of a fully submerged Hydrofoil Craft has manual input of fore-foil depth and control mode selection to improve the performance of the control system. However, the manual input needs skillful human operation and observation of waves the encountered to work well over a wide range of waves. In order to use information about the waves encountered in the control system, we considered the estimation of wave elevation and wave disturbance which was caused by the orbital motion of the waves in irregular waves. First, we investigated the wave disturbance by a fully submerged Hydrofoil Craft, in a state-space model of wave disturbance, and in Hydrofoil Craft motion, etc. We than considered estimations of the wave elevation and wave disturbance using a shaping filter, a Kalman filter, an autoregressive (AR) model, etc. Finally, we confirmed through simulations that the estimation results and estimation error of wave elevation and wave disturbance were valid.
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on the design of a longitudinal motion control system of a fully submerged Hydrofoil Craft based on the optimal preview servo system
Ocean Engineering, 2004Co-Authors: Sang-hyun Kim, Hiroyuki YamatoAbstract:The current control system of a fully-submerged Hydrofoil Craft based on optimal feedback control has several problems: it has no good performance of contouring waves and it cannot reduce the effect of wave disturbance. In this paper, we apply the optimal preview servo system to the longitudinal control system of a fully-submerged Hydrofoil Craft in order to settle the problems of current control system. The control system based on optimal preview servo system is composed of feedback controller and feedforward controller. Also in order to design the control system, the necessary prediction range of future information, the weight function in performance index, the future reference input and wave disturbance are determined. Finally, the validity of the proposed control system in this paper is confirmed by simulation. The simulation results show that the control system has good performance of contouring waves in following seas and is effective to settle the problems of current control system of a fully-submerged Hydrofoil Craft.
Songlin Yang - One of the best experts on this subject based on the ideXlab platform.
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contrastive analysis on parameter identification of unmanned gliding Hydrofoil Craft s maneuverability based on ga and pso
Advanced Materials Research, 2014Co-Authors: Mengyun Wang, Songlin Yang, Yi ChenAbstract:In this paper, the mathematical model of unmanned gliding-Hydrofoil Craft’s maneuverability is established by parameter identification theory. The objective function is established based on the data obtained in the experiment in towing tank. Two kinds of identification programs that genetic algorithm(GA) and particle swarm optimization(PSO) are written based on MATLAB. Each parameter of the objective function is identified based on the two programs respectively. The feasibility of the mathematical model is manifested by comparing the results of identification with experimental data. A full analysis and comparison is performed at the optimize efficiencies of the two programs.
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an experimental study on hydrodynamic characteristics of gliding Hydrofoil Craft
Journal of Marine Science and Technology, 2011Co-Authors: Shuling Chen, Songlin YangAbstract:The Gliding-Hydrofoil Craft (GHC) has been recently proposed by the authors from JUST, which is partially similar to a planing Craft but has a Hydrofoil installed in the front part of the ship. To study its hydrodynamic characteristics, model tests are carried out in a towing tank, and the total resistance, trim angle and wetted area of the Craft in the cases with different Froude numbers are measured. This paper presents analysis on the experimental data and discusses the effects of the submerged depth and initial attack angle of the Hydrofoil.
Lanyong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Modified adaptive complementary sliding mode control for the longitudinal motion stabilization of the fully-submerged Hydrofoil Craft
'Elsevier BV', 2019Co-Authors: Sheng Liu, Hongmin Niu, Lanyong ZhangAbstract:This paper presents a Modified Adaptive Complementary Sliding Mode Control (MACSMC) system for the longitudinal motion control of the Fully-Submerged Hydrofoil Craft (FSHC) in the presence of time varying disturbance and uncertain perturbations. The nonlinear disturbance observer is designed with less conservatism that only boundedness of the derivative of the disturbance is required. Then, a complementary sliding mode control system combined with adaptive law is designed to reduce the bound of stabilization error with fast convergence. In particularly, the modified complementary sliding mode surface which contains the estimation of the disturbance can reduce the switching gain and retain the normal performance of the system. Moreover, a hyperbolic tangent function contained in the control law is utilized to attenuate the chattering of the actuator. The global asymptotic stability of the closed-loop system is demonstrated utilizing the Lyapunov stability theory. Ultimately, the simulation results show the effectiveness of the proposed approach. Keywords: Disturbance observer, Fully-submerged Hydrofoil Craft, Longitudinal motion stabilization, Modified adaptive complementary sliding mode contro
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modified adaptive complementary sliding mode control for the longitudinal motion stabilization of the fully submerged Hydrofoil Craft
International Journal of Naval Architecture and Ocean Engineering, 2019Co-Authors: Sheng Liu, Hongmin Niu, Lanyong ZhangAbstract:Abstract This paper presents a Modified Adaptive Complementary Sliding Mode Control (MACSMC) system for the longitudinal motion control of the Fully-Submerged Hydrofoil Craft (FSHC) in the presence of time varying disturbance and uncertain perturbations. The nonlinear disturbance observer is designed with less conservatism that only boundedness of the derivative of the disturbance is required. Then, a complementary sliding mode control system combined with adaptive law is designed to reduce the bound of stabilization error with fast convergence. In particularly, the modified complementary sliding mode surface which contains the estimation of the disturbance can reduce the switching gain and retain the normal performance of the system. Moreover, a hyperbolic tangent function contained in the control law is utilized to attenuate the chattering of the actuator. The global asymptotic stability of the closed-loop system is demonstrated utilizing the Lyapunov stability theory. Ultimately, the simulation results show the effectiveness of the proposed approach.
Shuling Chen - One of the best experts on this subject based on the ideXlab platform.
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Hydrodynamic behaviour of gliding Hydrofoil Crafts
2013Co-Authors: Shuling ChenAbstract:A new type of high-speed Craft, called a Gliding-Hydrofoil Craft (GHC), has recently been developed in Jiangsu University of Science and Technology, China. This Craft is similar to a planing hull but with a Hydrofoil in the front part of its body. The fixed Hydrofoil improves the seakeeping properties and stability of the Craft compared with a conventional planing hull. In addition, the GHC has a more simple structure and higher stability when compared to a Hydrofoil Craft. Unlike conventional planing hulls and Hydrofoil Crafts, the study of hydrodynamics of GHC has been overlooked. The present work aims to advance our understanding on hydrodynamics of GHC, both model tests and numerical investigations are presented. To study its hydrodynamic characteristics, model tests are carried out in a towing tank, and the total resistance, trim angle and wetted area of the Craft in the cases with different Froude numbers are measured. For the purpose of comparison, model tests have also been carried out for the hull without the Hydrofoil. This thesis presents analysis on the experimental data and discusses the effects of the submerged depth and initial attack angle of the Hydrofoil on the hydrodynamic features of the GHC. On this basis, the FLUENT software is then adopted to numerically investigate the hydrodynamics of the GHC. The accuracy of the FLUENT addressing this problem is validated by comparing the numerical solutions with the experimental data. The validation cases include 2D Hydrofoil in current, Wigley hull with steady forward speed. Good agreement between numerical results and experimental data was obtained. Considering the significance of the turbulence involved in the problem, especially near the Hydrofoil, a numerical investigation aiming to find a suitable turbulence model has been carried out. After being validated, 3D numerical simulations on both the planing Craft and the GHC in steady flow are considered. The resistance coefficient, pressure coefficient and wave pattern with different Froude number are investigated. Some results are compared with experiment data obtained in the model tests. The wave pattern, velocity field and pressure distribution near the hulls are discussed in detail as well as the influence of the Hydrofoil. Finally, the hydrodynamic performance of GHC in unsteady flow is investigated. Three cases were considered: ship berthing, leaving the harbour and turning navigation direction; which are very commonly seen unsteady examples in reality. The preliminary results presented in this thesis have confirmed the significant effects due to the unsteady procedure and imply the need of carrying out unsteady simulations in the future.
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an experimental study on hydrodynamic characteristics of gliding Hydrofoil Craft
Journal of Marine Science and Technology, 2011Co-Authors: Shuling Chen, Songlin YangAbstract:The Gliding-Hydrofoil Craft (GHC) has been recently proposed by the authors from JUST, which is partially similar to a planing Craft but has a Hydrofoil installed in the front part of the ship. To study its hydrodynamic characteristics, model tests are carried out in a towing tank, and the total resistance, trim angle and wetted area of the Craft in the cases with different Froude numbers are measured. This paper presents analysis on the experimental data and discusses the effects of the submerged depth and initial attack angle of the Hydrofoil.
