Optimization of the Drag Force of Planing Boat with Trim Control System Using Genetic Algorithm

Abdollah Sakaki,Mohsen Sadeghian,Hassan Ghassemi,Koorosh Aslansefat

doi:10.12691/ajme-5-4-8

Abstract

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.

Highlights

The concept of planing boats was recognized in the late nineteenth century, the first practical application of the concept can be traced to the development of seaplane hulls during the beginning of the twentieth century
Case of Savitsky and Brown were optimized by only changing the llllll variables
The results show the decrease of total resistance of that boat in a specified trim angle

Summary

Introduction

The concept of planing boats was recognized in the late nineteenth century, the first practical application of the concept can be traced to the development of seaplane hulls during the beginning of the twentieth century. Their observation indicated the complex behavior of the wetted area and the stagnation line angle [7].The reported results can be a useful reference when dealing with pre-planing and planing boat form They high light a speed range where the warping of hull bottom and the increased deadrise angles of the forward part of the hull do not significantly affect the hydrodynamic resistance and identify a relative speed range where they can be comparable to medium-deadrise mono-hedral. Optimization of the performance of the planing boats on running trim and resistance is investigated For this purpose, mathematical formulation of Savitsky’s method and effects of trim-tab on forces and center of pressure are explained. Many numerical results on the planing hull carried out by CFD solver [24,25,26]

Problem Formulas

Results and Discussion

Conclusions