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Item type:Publication, Access status: without files , Calculation of Force-Coefficients of a Wind Propulsion System for a 4 DOF Velocity / Power Prediction Program(2024-06); In this paper, a method to calculate the force coefficients of a wind propulsion system consisting of single wind propulsion elements is presented. With this method it is possible to calculate the forces of the whole system using measured or calculated force coefficients of single elements, without knowledge of the section shape of the wind propulsion elements. The single elements are modelled as horseshoe vortices to calculate the interaction inbetween the elements. This method is based on potential theory in order to quickly obtain sufficiently accurate force coefficients, which are necessary for velocity respectively power prediction programs. These programs balances the forces acting on the ship to evaluate the performance of the wind ship or wind assisted ship in an early design stage. Calculations of wind propulsion systems consisting of five and six curved rectangular plates are presented and compared with wind tunnel measurements. These calculations demonstrate adequate accuracy, particularly in the domain of small angles of attack, which is of interest for wind-assisted ships.Publicationtype: Conference Paper49 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Die HOOU an der TUHH : Erfahrungen und Erfolge 2022In 2022, 9 projects were implemented within the Hamburg Open Online University at the University of Technology Hamburg. In this booklet, the lessons learnt within these projects are consolidated.Publicationtype: Project Deliverable126 69 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A4 Degree of freedom velocity / Power prediction program for wind (assisted) vesselsThis paper presents a velocity prediction program (VPP) respectively a power prediction program (PPP) for ships driven or assisted by wind propulsion systems named”E4-SAIL”. The program balances the forces acting on the ship in the four degrees of freedom (4DOF) surge, sway, roll and yaw. Therefore, environmental forces caused by wind, current and seastate can be considered. The VPP/PPP is embedded within the design environment”E4”, so the pediction can be refined directly within the design process whenever more information on the ship is known. Thanks to the integration into the design environment, the calculation of the transversal forces acting on the hull and the forces due to the seastate takes into account the shape of the hull instead of using only an amount of ship parameters. Because the VPP/PPP is intended for use in the early design stage, the calculations have to run very fast, so that the effect of several changes in hullform and floating position can easily be checked during the design process. The individual force components are presented and an exemplary calculation for a tall ship is shown.Publicationtype: Conference Paper34 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , HOOU an der TU Hamburg : Jahresbericht 2022(2023-02); ; ; ; In this report the Hamburg Open Online University at the TU Hamburg (HOOU@TUHH) presents its work in 2022.Publicationtype: Project Deliverable217 455