ModiYacht - Feature-line and
Attributive based Shape Modifiers for External Design of
Superyachts
Erkan Günpınar Shahroz
Khan Kemal Mert Doğan Salih Ertuğ Övür
Short Summary
A yacht is a recreational boat or ship whose external appearance should
attract customers in order to make them buy it. Computer-Aided Design
(CAD) softwares that are utilized for external design of these yachts
are not easy to use and can be utilized by experienced design engineers.
Improvements in design tools enable designers to generate innovative
designs and increases their flexibility. User friendly design tools
enables even customers to involve the design process to some extent.
This project involves three main research issues. First of all, a novel
design framework for the generation of planing, displacement and semi
displacement hull types has been proposed. The hull is divided into
three regions: entrance, middle and run. Geometric parameters are
defined on the hull and shape operators generates new hull types based
on these parameters. The modifiers take three quality criteria into
account: G1 geometric continuties between neighboring regions, hull
fairness and independent modification of geometric parameters. Second
research work is to learn hull adjectives (such as strong, speedy)
defining hulls via surveys. Relationships between hull adjectives and
geometric parameters are learned by means of machine learning
algorithms. Finally, a novel model sampling algorithm has been proposed
for the generation of adjective-based hull models. The sampling
algorithm is based on teaching and learning based algorithm and
generates desired number of adjective-based models automatically.
The main outcome of this project is ModiYacht CAD tool that can generated
hull variations. Via user interface of this software, parametric and
adjective-based model variations can be obtained. The modified hull can
be exported in standard file format so that hydrodynamic analyses can be
performed.
The project was supported by the Scientific and Technological Research
Council of Turkey (TUBITAK, Project Number: 214M333)
Journal Papers
1. Shahroz Khan, Erkan Günpınar, Kemal Mert Dogan, “A Novel Design
Framework for Generation and Parametric Modification of Yacht Hull
Surfaces”, Ocean Engineering, Vol. 136, 05/2017, s. 243–259.
Abstract
This paper proposes a new design framework for the parametric design and
shape modification of yacht hulls. In this framework, the hull is
divided into three sections (entrance, middle and run) and each section
is represented separately. In this way, a designer has better design
flexibility so that higher design variations of the hull can be
achieved. Each section consists of keel line, deck line, chine line and
station line(s) that are represented using cubic Bezier curves and these
lines are called feature curves. 3D surface model of a yacht hull is
obtained by generating the Coons patches on the feature curves. Shape
operators are also introduced and implemented for the modification of
the given hull shape while considering some quality criteria such as
hull fairness. Experiments in this study shows that variety of hull
shapes can be generated using the proposed design framework with the
application of the shape operators.
Citation (BibTeX)
Paper
CAD Tool - ModiYacht
Modi Yacht is a CAD tool which is developed to perform parametric and
adjective based modification of yacht hull forms. Modi Yacht consists of
three different modules: parametric-based modeling, adjective-based
modeling and hull hydrostatics. Parametric-based modeling helps its user
to perform instantaneous design modification in their hull designs. User
can create wide variety of designs for yacht hull and can transform one
type of hull to a complete different type. For parametric modeling, Modi
Yacht uses the combination of traditional and custom made design
parameters. It helps its user to fully integrate with the design to
modify both minor and major features of yacht hull form such as, width
(Beam), Depth, Length, Chine positions, entrance angle, station
concavities, etc. Adjective-based modeling ability of ModiYacht enables
the designers to create desired number of designs based on the
predefined adjective. User can select single or multiple adjectives
based hull forms. The generation of these models is autonomous, user has
to define N number of design and select desired adjectives. This modeler
performs uniform sampling in the defined design space and automatically
generate adjective based designs. User can also calculate the
hydrostatic results and form coefficients of their modified
designs.
User Manual in Turkish
User Manual in English
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