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Evaluation of the Hydrodynamic Performance of Planing Boat with Trim Tab and Interceptor and Its Optimization Using Genetic Algorithm

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Nowadays, several stern devices are attracting a great deal of attention. The control surface is an effective apparatus for improving the hydrodynamic performance of planing hulls and is considered an important element in the design of planing hulls. Control surfaces produce forces and a pitching moment due to the pressure distribution that they cause, which can be used to change the running state of high-speed marine boats. This work elaborates a new study to evaluate the hydrodynamic performance of a planing boat with a trim tab and an interceptor, and optimizes them by using an optimization algorithm. The trim tab and the interceptor have been used to optimize the running trim and motion control of semi-planing and planing boats at various speeds and sea conditions for many years. In this paper, the usage of trim tab is mathematically verified and experimental equations are utilized to optimize the performance of a planing boat at a specificd trim angle by using an optimization algorithm. The genetic algorithm (GA) is one of the most useful optimizing methods and is used in this study. The planing boat equations were programmed according to Savitsky’s equations and then analyzed in the framework of the GA-based optimization for performance improvement of theplaning hull. The optimal design of trim tab and interceptor for planing boat can be considered a multi-objective problem. The input data of GA include different parameters, such as speed, longitudinal center of gravity, and deadrise angle. We can extract the best range of forecasting the planing boat longitudinal center of gravity, the angle of the trim, and the least drag force at the best trim angle of the boat.

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M :

Displacement of boat

F :

Hydrodynamic force

β :

Deadrise angle

ρ :

Density of water

C L0 :

C at zero deadrise angle

C :

Lift coefficient

C P :

Pressure coefficient

C F :

Frictional drag coefficient

C L TB :

Lift coefficient of trim tab

C L Int :

Lift coefficient of interceptor

λ :

Mean wetted length-to-beam ratio

l p :

Longitudinal center of pressure

L K :

Keel wetted length

L C :

Chine wetted length

L TB :

Lift of trim tab

D TB :

Drag of trim tab

M TB :

Moment of trim tab

L c TB :

Chord length of trim tab

α TB :

Trim tab deflection

L Int :

Lift of interceptor

D Int :

Drag of interceptor

M Int :

Moment of interceptor

L c Int :

Chord length of interceptor

α Int :

Interceptor deflection

τ :

Trim angle

Fn B :

Beam Froude number

Rn :

Reynolds number

B :

Breadth of the boat

V :

Boat velocity

g :

Gravitational acceleration

D f :

Frictional resistance

S :

Wetted surface of the boat

v :

Kinematic viscosity of the water

α :

Trim tab angle

x cp :

Center of lift force of trim tab

x l :

Distance from the center of lift force of trim tab to center of gravity


Longitudinal center of gravity


Vertical center of gravity


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Correspondence to Hassan Ghassemi.

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Sakaki, A., Ghassemi, H. & Keyvani, S. Evaluation of the Hydrodynamic Performance of Planing Boat with Trim Tab and Interceptor and Its Optimization Using Genetic Algorithm. J. Marine. Sci. Appl. 18, 131–141 (2019).

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