A hydrodynamic model for simulating swath ship motions with fuzzy control

Ming-Chung Fang, Shan Chin Chiou

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A time simulation technique with fuzzy control algorithm is evaluated to predict the motion response of the SWATH ship controllable stabilizer fins in longitudinal regular and irregular waves. In the paper, a mathematical model including the effect of surge force, viscous force, and the fin force is developed to simulate the SWATH ship motion. The stabilizer fin control using the fuzzy algorithm is applied to reduce the pitch motion of the SWATH ship. Basically the fuzzy controller consists of five parts: (1) Fuzzifier (2) Rule base (3) Data base (4) Inference engine (5) Defuzzifier. The calculations of the corresponding hydrodynamic coefficients at each time step follow the simplified technique developed before, which needs only one set of initial input data of the ship configuration. After comparing with the previous technique, i.e. "bang-bang" control, we find that the present fuzzy control appears to be more practical for operating stabilizer fins. Therefore, incorporating the fuzzy control algorithm, the hydrodynamic model developed here may offer more valuable contributions to the SWATH ship design with controllable fin effects.

Original language English 277-303 27 International Shipbuilding Progress 48 4 Published - 2001 Dec 1

Fingerprint

Fuzzy control
Ships
Hydrodynamics
Stabilizers (marine vessel)
Inference engines
Mathematical models
Controllers

All Science Journal Classification (ASJC) codes

• Ocean Engineering
• Mechanical Engineering

Cite this

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title = "A hydrodynamic model for simulating swath ship motions with fuzzy control",
abstract = "A time simulation technique with fuzzy control algorithm is evaluated to predict the motion response of the SWATH ship controllable stabilizer fins in longitudinal regular and irregular waves. In the paper, a mathematical model including the effect of surge force, viscous force, and the fin force is developed to simulate the SWATH ship motion. The stabilizer fin control using the fuzzy algorithm is applied to reduce the pitch motion of the SWATH ship. Basically the fuzzy controller consists of five parts: (1) Fuzzifier (2) Rule base (3) Data base (4) Inference engine (5) Defuzzifier. The calculations of the corresponding hydrodynamic coefficients at each time step follow the simplified technique developed before, which needs only one set of initial input data of the ship configuration. After comparing with the previous technique, i.e. {"}bang-bang{"} control, we find that the present fuzzy control appears to be more practical for operating stabilizer fins. Therefore, incorporating the fuzzy control algorithm, the hydrodynamic model developed here may offer more valuable contributions to the SWATH ship design with controllable fin effects.",
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In: International Shipbuilding Progress, Vol. 48, No. 4, 01.12.2001, p. 277-303.

Research output: Contribution to journalArticle

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AU - Fang, Ming-Chung

AU - Chiou, Shan Chin

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N2 - A time simulation technique with fuzzy control algorithm is evaluated to predict the motion response of the SWATH ship controllable stabilizer fins in longitudinal regular and irregular waves. In the paper, a mathematical model including the effect of surge force, viscous force, and the fin force is developed to simulate the SWATH ship motion. The stabilizer fin control using the fuzzy algorithm is applied to reduce the pitch motion of the SWATH ship. Basically the fuzzy controller consists of five parts: (1) Fuzzifier (2) Rule base (3) Data base (4) Inference engine (5) Defuzzifier. The calculations of the corresponding hydrodynamic coefficients at each time step follow the simplified technique developed before, which needs only one set of initial input data of the ship configuration. After comparing with the previous technique, i.e. "bang-bang" control, we find that the present fuzzy control appears to be more practical for operating stabilizer fins. Therefore, incorporating the fuzzy control algorithm, the hydrodynamic model developed here may offer more valuable contributions to the SWATH ship design with controllable fin effects.

AB - A time simulation technique with fuzzy control algorithm is evaluated to predict the motion response of the SWATH ship controllable stabilizer fins in longitudinal regular and irregular waves. In the paper, a mathematical model including the effect of surge force, viscous force, and the fin force is developed to simulate the SWATH ship motion. The stabilizer fin control using the fuzzy algorithm is applied to reduce the pitch motion of the SWATH ship. Basically the fuzzy controller consists of five parts: (1) Fuzzifier (2) Rule base (3) Data base (4) Inference engine (5) Defuzzifier. The calculations of the corresponding hydrodynamic coefficients at each time step follow the simplified technique developed before, which needs only one set of initial input data of the ship configuration. After comparing with the previous technique, i.e. "bang-bang" control, we find that the present fuzzy control appears to be more practical for operating stabilizer fins. Therefore, incorporating the fuzzy control algorithm, the hydrodynamic model developed here may offer more valuable contributions to the SWATH ship design with controllable fin effects.

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