- Im 27 years old. my interested is hydrodynamic of underwater vehicles specific SWA ships an multihulls shipsedit
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... more
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 multiobjective
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.
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 multiobjective
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.
Research Interests:
In the present study, the reliability evaluation application during design, maintenance and repair phases have been investigated for the girder of a ship's hull. The objective of the project was to develop reliability-based methods which... more
In the present study, the reliability evaluation application during design, maintenance and repair phases have been investigated for the girder of a ship's hull. The objective of the project was to develop reliability-based methods which are to be used for the design of ship structures, in particular by the calibration of the safety factors in the design rules. In order to evaluate the structural strength, the extended model of the ultimate limit state of the hull-girder, regarding corrosion and fatigue defects, has been used based using a time-dependent prob-abilistic analysis. Time-dependent reliability has been evaluated using the required minimum elastic section modulus; in the case of fatigue in a ship's deck this process has been done using mechanical fracture and the S-N curve. The results from the reliability evaluation using the Monte-Carlo simulation method and First-order reliability methods (FORM), indicated that these two methods agreed well. Analysis of the corrosion defect reliability showed a decrease of the structure's reliability during its lifetime; hence it is possible to use the reliability criteria in the design phase in order to achieve a better perception of the structure's operation during its lifetime with regard to environmental conditions. A comparison between the fatigue analysis results showed that the fracture mechanics method gave more conservative results compared to the S-N curve method, because of the way it considers early crack size.
Research Interests:
The control surface is an effective apparatus for improving the performance of planing boats and is considered an important element in the design of planing boats. Trim-tabs are placed at the transom to give better trim angle in order to... more
The control surface is an effective apparatus for improving the performance of planing boats and is considered an important element in the design of planing boats. Trim-tabs are placed at the transom to give better trim angle in order to diminish the resistance. In this paper, algorithm genetic (GA) is applied to find the trim, resistance and dearrise angle using Savitsky's formulas. The input data are all boat dimensions, including trim-tab data. The output results are trim angle, longitudinal center of gravity (lcg) and deadrise angle (β) and minimum resistance.