Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and M... more Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and Mechanical Systems Christian JOCHUM, Kostia RONCIN, Guilhem BLES, Richard LE LOUP (PhD student) Company OCEA : project « Beyond the sea » -Arcachon, France Yves PARLIER University « Joseph FOURIER » -Grenoble, France. Laboratory 3S-R : the laboratory Soils, Solids, Structures -Risks Ali TOURABI, Wassim DIB (PhD student) Some research works on modeling the towing kites Argatov, I., Rautakorpi, P., and Silvennoinen, R., "Estimation of the mechanical energy output of the kite wind generator". Renewable Energy, 34:1525-1532, 2009. (R.I.M.E.P. St Petersburg) Braud, P., "A Velocitity Prediction Program for kite boarding", a thesis submitted in partial fulfillment of the requirements for the degree of Master
Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and M... more Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and Mechanical Systems Christian JOCHUM, Kostia RONCIN, Guilhem BLES, Richard LE LOUP (PhD student) Company OCEA : project « Beyond the sea » -Arcachon, France Yves PARLIER University « Joseph FOURIER » -Grenoble, France. Laboratory 3S-R : the laboratory Soils, Solids, Structures -Risks Ali TOURABI, Wassim DIB (PhD student) Some research works on modeling the towing kites Argatov, I., Rautakorpi, P., and Silvennoinen, R., "Estimation of the mechanical energy output of the kite wind generator". Renewable Energy, 34:1525-1532, 2009. (R.I.M.E.P. St Petersburg) Braud, P., "A Velocitity Prediction Program for kite boarding", a thesis submitted in partial fulfillment of the requirements for the degree of Master
L'utilisation de cerfs-volants de traction (kites) comme moyen de propulsion auxiliaire permet de... more L'utilisation de cerfs-volants de traction (kites) comme moyen de propulsion auxiliaire permet de diminuer la consommation de pétrole des navires. Ces pourquoi les kites ont fait l'objet de nombreuses études ces dernières années. Mais la complexité de leur modélisation pousse à développer des modèles simples tels que le modèle « zero-mass ». Cependant, la variation des caractéristiques aérodynamiques du kite n'y est pas prise en compte. C'est pourquoi l'étude de l'influence du virage aux extrémités d'une trajectoire en « 8 » a été réalisée afin de l'intégrer au modèle « zero-mass ». Pour ce faire, la méthode de ligne portante a été utilisée pour la modélisation du kite en rotation.
The use of kites for auxiliary propulsion reduces oil consumption for vessels. But the complexity... more The use of kites for auxiliary propulsion reduces oil consumption for vessels. But the complexity of the kite numerical simulation induces the development of computationally efficient models based on lifting line theory to evaluate the aerodynamic characteristics of the kite. The presented 3D lifting line model takes into account the three-dimensional shape of the kite and the viscosity of the fluid. The proposed model was applied to a F-one Revolt Leading Edge Inflatable kite to predict its lift-to-drag ratio. Finally, this method is in very good agreement with CFD simulations in the case of a paragliding wing, but needs a much smaller computational effort.
To meet the Microtransat challenge, ENSTA Bretagne chose to realize several sailing robots. The f... more To meet the Microtransat challenge, ENSTA Bretagne chose to realize several sailing robots. The first, having served as a test platform, allowed us to develop two new boats, one for research and one for the Atlantic crossing. The different tests in the bay of Brest allowed us to improve the reliability of systems on our sailboat. Various studies have been conducted to improve reliability of sailboats both mechanically and electronically. This tests allowed us to test different concepts on the three Breizh Spirit boats. The results are very positive and we can now say that we have a boat able to resist to strong storms, to follow a predifined route, to supply its own energy and to navigate in sea waves. From the experience acquired from Breizh Spirit 1, we hope we will be able to cross the Atlantic Ocean.
An implementation of a kite modelling approach into 6 degrees of freedom sailboat dynamic simulat... more An implementation of a kite modelling approach into 6 degrees of freedom sailboat dynamic simulator is introduced. This enables an evaluation of kite performance in comparison with classical rig sailing. A "zero-mass" model was used to model kite forces. Influence of the wind gradient was properly taken into account which led to significant modifications in the calculation of the relative wind, both in magnitude and in orientation. The modelling is performed with real aerodynamic characteristics given by experimental data. An optimization is done to determine the best kite flight configuration in terms of performance. Validation steps of the sail yacht simulator are performed for a classical rig on the example of an 8 meter one design yacht. The experimental setup is described and validation results are discussed. An interpolation technique in space and time of the wind mesh was used, based on measurements made at four different locations of the navigation spot. Boat motions were recorded by high resolution GPS and inertial unit systems. Speed polar diagram results, reached by kite propulsion, were predicted versus true wind angle. At last a comparison is made for upwind and downwind legs in sea trials conditions, between simulations with the classical rig and the kite. It is shown that the boat towed by kite would achieve much better sailing performance.
... Jan SLIWKA, Pierre-Henri REILHAC, Richard LELOUP, Pierre CREPIER, Henry DE MALET, Patrick SIT... more ... Jan SLIWKA, Pierre-Henri REILHAC, Richard LELOUP, Pierre CREPIER, Henry DE MALET, Patrick SITTARAMANE, Fabrice LE BARS, Kostia RONCIN, Bruno AIZIER, Luc JAULIN et al. ... 7)Keel: The keel's lead bulb was cast using a mould as you see the figure 8. Fig. ...
The auxiliary propulsion of commercial ships requires huge kites for huge propulsive loads. Numer... more The auxiliary propulsion of commercial ships requires huge kites for huge propulsive loads. Numerical tools must be implemented in order to evaluate the stress level within the kite fabric. In the present study, the kite fluid modelling is done using the 3D lifting line method. The load distribution is transferred to the structural modelling. The finite element analysis of the kite is based on shell elements for the fabric and beam elements for the laths. The stress distribution within the kite fabric is computed for the case of a F-one Revolt kite in a static flight case.
Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and M... more Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and Mechanical Systems Christian JOCHUM, Kostia RONCIN, Guilhem BLES, Richard LE LOUP (PhD student) Company OCEA : project « Beyond the sea » -Arcachon, France Yves PARLIER University « Joseph FOURIER » -Grenoble, France. Laboratory 3S-R : the laboratory Soils, Solids, Structures -Risks Ali TOURABI, Wassim DIB (PhD student) Some research works on modeling the towing kites Argatov, I., Rautakorpi, P., and Silvennoinen, R., "Estimation of the mechanical energy output of the kite wind generator". Renewable Energy, 34:1525-1532, 2009. (R.I.M.E.P. St Petersburg) Braud, P., "A Velocitity Prediction Program for kite boarding", a thesis submitted in partial fulfillment of the requirements for the degree of Master
Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and M... more Engineering school ENSTA Bretagne -Brest, France. Laboratory LBMS : the laboratory of Brest and Mechanical Systems Christian JOCHUM, Kostia RONCIN, Guilhem BLES, Richard LE LOUP (PhD student) Company OCEA : project « Beyond the sea » -Arcachon, France Yves PARLIER University « Joseph FOURIER » -Grenoble, France. Laboratory 3S-R : the laboratory Soils, Solids, Structures -Risks Ali TOURABI, Wassim DIB (PhD student) Some research works on modeling the towing kites Argatov, I., Rautakorpi, P., and Silvennoinen, R., "Estimation of the mechanical energy output of the kite wind generator". Renewable Energy, 34:1525-1532, 2009. (R.I.M.E.P. St Petersburg) Braud, P., "A Velocitity Prediction Program for kite boarding", a thesis submitted in partial fulfillment of the requirements for the degree of Master
L'utilisation de cerfs-volants de traction (kites) comme moyen de propulsion auxiliaire permet de... more L'utilisation de cerfs-volants de traction (kites) comme moyen de propulsion auxiliaire permet de diminuer la consommation de pétrole des navires. Ces pourquoi les kites ont fait l'objet de nombreuses études ces dernières années. Mais la complexité de leur modélisation pousse à développer des modèles simples tels que le modèle « zero-mass ». Cependant, la variation des caractéristiques aérodynamiques du kite n'y est pas prise en compte. C'est pourquoi l'étude de l'influence du virage aux extrémités d'une trajectoire en « 8 » a été réalisée afin de l'intégrer au modèle « zero-mass ». Pour ce faire, la méthode de ligne portante a été utilisée pour la modélisation du kite en rotation.
The use of kites for auxiliary propulsion reduces oil consumption for vessels. But the complexity... more The use of kites for auxiliary propulsion reduces oil consumption for vessels. But the complexity of the kite numerical simulation induces the development of computationally efficient models based on lifting line theory to evaluate the aerodynamic characteristics of the kite. The presented 3D lifting line model takes into account the three-dimensional shape of the kite and the viscosity of the fluid. The proposed model was applied to a F-one Revolt Leading Edge Inflatable kite to predict its lift-to-drag ratio. Finally, this method is in very good agreement with CFD simulations in the case of a paragliding wing, but needs a much smaller computational effort.
To meet the Microtransat challenge, ENSTA Bretagne chose to realize several sailing robots. The f... more To meet the Microtransat challenge, ENSTA Bretagne chose to realize several sailing robots. The first, having served as a test platform, allowed us to develop two new boats, one for research and one for the Atlantic crossing. The different tests in the bay of Brest allowed us to improve the reliability of systems on our sailboat. Various studies have been conducted to improve reliability of sailboats both mechanically and electronically. This tests allowed us to test different concepts on the three Breizh Spirit boats. The results are very positive and we can now say that we have a boat able to resist to strong storms, to follow a predifined route, to supply its own energy and to navigate in sea waves. From the experience acquired from Breizh Spirit 1, we hope we will be able to cross the Atlantic Ocean.
An implementation of a kite modelling approach into 6 degrees of freedom sailboat dynamic simulat... more An implementation of a kite modelling approach into 6 degrees of freedom sailboat dynamic simulator is introduced. This enables an evaluation of kite performance in comparison with classical rig sailing. A "zero-mass" model was used to model kite forces. Influence of the wind gradient was properly taken into account which led to significant modifications in the calculation of the relative wind, both in magnitude and in orientation. The modelling is performed with real aerodynamic characteristics given by experimental data. An optimization is done to determine the best kite flight configuration in terms of performance. Validation steps of the sail yacht simulator are performed for a classical rig on the example of an 8 meter one design yacht. The experimental setup is described and validation results are discussed. An interpolation technique in space and time of the wind mesh was used, based on measurements made at four different locations of the navigation spot. Boat motions were recorded by high resolution GPS and inertial unit systems. Speed polar diagram results, reached by kite propulsion, were predicted versus true wind angle. At last a comparison is made for upwind and downwind legs in sea trials conditions, between simulations with the classical rig and the kite. It is shown that the boat towed by kite would achieve much better sailing performance.
... Jan SLIWKA, Pierre-Henri REILHAC, Richard LELOUP, Pierre CREPIER, Henry DE MALET, Patrick SIT... more ... Jan SLIWKA, Pierre-Henri REILHAC, Richard LELOUP, Pierre CREPIER, Henry DE MALET, Patrick SITTARAMANE, Fabrice LE BARS, Kostia RONCIN, Bruno AIZIER, Luc JAULIN et al. ... 7)Keel: The keel's lead bulb was cast using a mould as you see the figure 8. Fig. ...
The auxiliary propulsion of commercial ships requires huge kites for huge propulsive loads. Numer... more The auxiliary propulsion of commercial ships requires huge kites for huge propulsive loads. Numerical tools must be implemented in order to evaluate the stress level within the kite fabric. In the present study, the kite fluid modelling is done using the 3D lifting line method. The load distribution is transferred to the structural modelling. The finite element analysis of the kite is based on shell elements for the fabric and beam elements for the laths. The stress distribution within the kite fabric is computed for the case of a F-one Revolt kite in a static flight case.
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