BATOPERF, A Performance Prediction Software and Its Influence on Modern Yacht Design

1997 ◽  
Author(s):  
Sylvain Fargeas ◽  
Juan Kouyoumdjian
Keyword(s):  
Performance Prediction ◽  
Transverse Plane ◽  
Side Force ◽  
Moment Equilibrium ◽  
Force Moment ◽  
Boat Speed ◽  
A Performance

BATOPERF considers the equilibrium of the forces acting on a boat when sailing in the thrust and in the canoe body and appendages side force directions. A transverse plane force moment equilibrium is also considered solving for three principal unknowns: boat speed, leeway and heel. In this paper an overall description will be given of the fundamental solving principles of BA TOPERF and its force models. Finally a comparison will be made against the IMS VPP in the context of the importance of accurately predicting boat speeds when designing an IMS boat.

Improvement of Sailing Yacht Performance Prediction by Including Force-Moment Equilibrium for the Calculation of Helm Angle in a Velocity Prediction Program

1995 ◽  
Author(s):  
Peter van Oossanen
Keyword(s):  
Mathematical Model ◽  
Performance Prediction ◽  
Model Tests ◽  
Side Force ◽  
Prediction Program ◽  
Moment Equilibrium ◽  
Force Moment ◽  
Velocity Prediction ◽  
Sailing Yacht ◽  
Rudder Angle

Contemporary Velocity Prediction Programs (VPP's) consider the equilibrium of forces acting on a sailing yacht in the thrust direction and in the direction of the developed side force on canoe body and appendages. In addition, force-moment equilibrium is considered in the transverse plane of the yacht. In this way a solution is found for the three main unknowns in performance prediction, viz: boat speed, leeway angle and heel angle. The impact of helm angle on performance is herein ignored. In the velocity prediction program developed by Van Oossanen & Associates, a fourth equilibrium condition is included, viz: force-moment equilibrium in the horizontal plane for the calculation of the helm angle required for the equilibrium sailing condition. In this paper a description is given of some of the main problems that need to be solved when introducing this fourth equilibrium requirement. One of these is associated with the development of accurate mathematical expressions for the calculation of rudder side force and resistance, as influenced by heel angle and the proximity of the free surface. Model tests can be utilized for obtaining insight into the physical phenomena involved in such cases. Model tests were carried out in the context of an optimization study for the design of a yacht according to the International Level Class 40 (ILC40) Rule, under the International Measurement System (IMS). The analysis of some of the results of these tests with respect to improving the mathematical model for rudder side force and resistance, is described in the paper. The effect of including this mathematical model in a VPP is demonstrated in the paper by providing the results of calculations which reveal that a variation in rudder angle causes significant speed differences. It is shown that the IMS VPP that is used to calculate the rating and speed potential of ILC40 and other IMS Class yachts, in not taking into account the significant variations in performance associated with different values of the equilibrium rudder angle (and the associated rudder side force and resistance), is not sufficiently accurate.

A performance prediction model for BIC-OFDM transmissions with AMC over nonlinear fading channels

2011 ◽  
Author(s):  
Filippo Giannetti ◽  
Ivan Stupia ◽  
Vincenzo Lottici ◽  
Riccardo Andreotti ◽  
Aldo N. D'Andrea ◽  
...  
Keyword(s):  
Prediction Model ◽  
Fading Channels ◽  
Performance Prediction ◽  
A Performance

scholarly journals MODELO DE PREVISÃO DE DESEMPENHO DE TRIATLETAS COM A UTILIZAÇÃO DA ANÁLISE DISCRIMINANTE (TRIATHLETES PERFORMANCE PREDICTION MODEL USING DISCRIMINANT ANALYSIS)

2017 ◽  
Vol 10 ◽  
pp. 111-118
Author(s):  
Domingos Rodrigues Pandeló Júnior
Keyword(s):  
Discriminant Analysis ◽  
Prediction Model ◽  
Performance Prediction ◽  
A Performance

A previsão do desempenho esportivo é relevante para a identificação de talentos e no estabelecimento de estratégias de treinamento. O objetivo do presente artigo é estabelecer um modelo que tenha a capacidade de predizer o desempenho de triatletas. Para isso foi utilizada a análise discriminante, que é uma técnica de análise multivariada. Trabalhou-se com 21 voluntários, sendo 7 profissionais e 14 amadores, todos do sexo masculino. Foram selecionadas variáveis antropométricas, fisiológicas e de treinamento fáceis de serem mensuradas, sem a necessidade de utilização de laboratórios específicos. O presente estudo mostrou que com a utilização de algumas variáveis pode-se buscar inferir a performance de triatletas. A previsão de performance é de vital importância, quer seja para a detecção de talentos, quer seja para a estruturação do treinamento, o que mostra a importância do desenvolvimento de modelos desse tipo.

A performance prediction framework for scientific applications

2006 ◽  
Vol 22 (3) ◽  
pp. 336-346 ◽  
Author(s):  
Laura Carrington ◽  
Allan Snavely ◽  
Nicole Wolter
Keyword(s):  
Performance Prediction ◽  
Scientific Applications ◽  
A Performance

Computation of the Usage Contexts Coverage of a Jigsaw With CSP Techniques

2010 ◽  
Author(s):  
Bernard Yannou ◽  
Jiliang Wang ◽  
Pierre-Alain Yvars
Keyword(s):  
Constraint Satisfaction ◽  
Performance Prediction ◽  
Constraint Satisfaction Problem ◽  
Design Parameters ◽  
A Value ◽  
Product Service ◽  
Value Sets ◽  
Usage Context ◽  
A Performance

In the context of the Usage Context Based Design (UCBD) of a product-service, a taxonomy of variables is suggested to setup the link between the design parameters of a product-service and the part of a set of expected usages that may be covered. This paper implements a physics-based model to provide a performance prediction for each usage context that also depends on the user skill. The physics describing the behavior and consequently the performances of a jigsaw are established. Simulating numerically the usage coverage is non trivial for two reasons: the presence of circular references in physical relations and the need to efficiently propagate value sets or domains instead of accurate values. For these two reasons, we modeled the usage coverage issue as a Constraint Satisfaction Problem and we result in the expected service performances and a value of a covered usage indicator.

Sign in / Sign up

Export Citation Format

Share Document