Resistance Prediction for Hard Chine Hulls in the Pre-Planing Regime

Abstract

A mathematical representation of calm-water resistance for contemporary planing hull forms based on the USCG and TUNS Series is presented. Regression analysis and artificial neural network (ANN) techniques are used to establish, respectively, Simple and Complex mathematical models. For the Simple model, resistance is the dependent variable (actually R/∆ for standard displacement of ∆ = 100000 lb), while the Froude number based on volume (F nV ) and slenderness ration (L/V 1/3 ) are the independent variables. In addition to these, Complex model's independent variables are the length beam ratio (L/B), the position of longitudinal centre of gravity (LCG/L) and the deadrise angle (β). The speed range corresponding to F nV values between 0.6 and 3.5 is analyzed. The Simple model can be used in the concept design phases, while the Complex one might be used for various numerical towing tank performance predictions duringall design phases, as appropriate.

KISS (Keep It Sustainable and Smart): A Research and Development Program for a Zero-Emission Small Crafts

“…To obtain a lower resistance, one must be able to obtain hydrodynamic lift at the lowest possible speed. Research results on semi-displacement hull optimization are reported in [35][36][37][38]; they are mainly experimental and the results in the form of regression formulas are very useful at a preliminary design stage and highlight the effect of hull geometry and CG position.…”

Calm Water Performance of Hard-Chine Vessels in Semi-Planing and Planing Regimes

“…Some other research activities related to the prediction of dynamic equilibrium of planing hulls have been conducted with the emphasis on warped hull planing hulls ( (Bertorello and Olivero (2007); Schachter et al (2016)). In recent years, Radojcic et al (2014a and developed relations for the resistance of such a hull by applying artificial neural networks.…”

A Hydrodynamic Methodology And CFD Analysis For Performance Prediction Of Stepped Planing Hulls

“…Their results included pressure distribution, trim angle, rise of centre of gravity and resistance at various speeds [11]. Recently, Radojcic et al [12] presented a mathematical model of calm-water resistance for contemporary planing hull forms based on the USCG and TUNS series. They derived two speed -dependent mathematical models, simple and complex, to evaluate the calm-water resistance.…”