A multi-technique simultaneous approach for the design of a sailing yacht

Ingrassia, Tommaso; Mancuso, Antonio; Nigrelli, Vincenzo; Tumino, Davide

doi:10.1007/s12008-015-0267-2

Cited by 16 publications

(8 citation statements)

References 22 publications

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“…1 left). The hull shape of the analyzed sailing yacht has been defined following a simultaneous design approach [12][13]. In particular, CFD codes and analytical resistance prediction models have been simultaneously used in order to find the optimal hull shape for a given sailing condition (close-hauled in a breeze).…”

Section: Case Studymentioning

confidence: 99%

A reverse engineering approach to measure the deformations of a sailing yacht

Paola

Ingrassia

Brutto

et al. 2016

Lecture Notes in Mechanical Engineering

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In this work, a multidisciplinary experience, aimed to study the permanent deformations of the hull of a regatta sailing yacht is described. In particular, a procedure to compare two different surfaces of the hull of a small sailing yacht, designed and manufactured at the University of Palermo, has been developed. The first one represents the original CAD model while the second one has been obtained by means of a reverse engineering approach. The reverse engineering process was performed through an automatic close-range photogrammetry survey, that has allowed to obtain very accurate measures of the hull, and a 3D modelling step by the well-known 3D computer graphics software Rhinoceros. The reverse engineering model was checked through two different procedures implemented by the graphical algorithm editor Grasshopper. The first procedure has allowed to compare the photogrammetric measurements with the rebuilt surface, in order to verify if the reverse engineering process has led to reliable results. The second has been implement to measure the deviations between the original CAD model and the rebuilt surface of the hull. This procedure has given the possibility to highlight any permanent deformation of the hull due to errors during the production phase or to excessive loads during its use. The obtained results have demonstrated that the developed procedure is very efficient and able to give detailed information on the deviation values of the two compared surfaces.

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Section: Case Studymentioning

confidence: 99%

A reverse engineering approach to measure the deformations of a sailing yacht

Paola

Ingrassia

Brutto

et al. 2016

Lecture Notes in Mechanical Engineering

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“…The RI panel employed a classic vacuum resin infusion process, with the dry lay-up assembly vacuum bagged and then impregnated by vacuum driven resin flow. Further details of the manufactures are given in two companion papers of this work [ 22 , 23 ], which investigate the flexural behaviour of sandwiches made with a cork agglomerated foam core and flax skins of the same material analysed here.…”

Section: Materials and Processesmentioning

confidence: 99%

Thermo-Mechanical Behaviour of Flax-Fibre Reinforced Epoxy Laminates for Industrial Applications

2015

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The present work describes the experimental mechanical characterisation of a natural flax fibre reinforced epoxy polymer composite. A commercial plain woven quasi-unidirectional flax fabric with spun-twisted yarns is employed in particular, as well as unidirectional composite panels manufactured with three techniques: hand-lay-up, vacuum bagging and resin infusion. The stiffness and strength behaviours are investigated under both monotonic and low-cycle fatigue loadings. The analysed material has, in particular, shown a typical bilinear behaviour under pure traction, with a knee yield point occurring at a rather low stress value, after which the material tensile stiffness is significantly reduced. In the present work, such a mechanism is investigated by a phenomenological approach, performing periodical loading/unloading cycles, and repeating tensile tests on previously “yielded” samples to assess the evolution of stiffness behaviour. Infrared thermography is also employed to measure the temperature of specimens during monotonic and cyclic loading. In the first case, the thermal signal is monitored to correlate departures from the thermoelastic behaviour with the onset of energy loss mechanisms. In the case of cyclic loading, the thermoelastic signal and the second harmonic component are both determined in order to investigate the extent of elastic behaviour of the material.

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“…Moreover, such kind of topology can easily manage parametric analyses obtained by changing some variables (like for instance jib and main sail angles). A detailed description of the analysed configuration can be found in [1]. For the purpose of this work the jib angle and the apparent wind direction have been fixed at 9 and 20 • respectively while four different apparent wind velocities have been simulated (3, 5, 7 and 9 m/s).…”

Section: Cfd Simulationsmentioning

confidence: 99%

“…Then, the analysis of the obtained numerical results can give useful hints about changes to be applied to the CAD model, in terms of shape, topology or other design parameters. If a structured design approach is followed [1,2], these modifications become easily applicable until satisfactory results are achieved. Of course, the accurate estimation of rigging loads (internal) and aero/hydro loads (external) becomes a necessary condition for reasonable results.…”

Section: Introductionmentioning

confidence: 99%

Using FEM simulation to predict structural performances of a sailing dinghy

Mancuso

Pitarresi

Tumino

2017

Int J Interact Des Manuf

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The use of finite element method (FEM) tools is proposed to investigate the structural response of an ecosustainable sailing yacht to different loading conditions, typical of those acting during regattas. The boat is, in particular, a 4.60 m dinghy with the hull and the deck made of an hybrid flax-cork sandwich and internal reinforcements made of marine plywood. A preliminary activity has consisted in the refitting of an existing model in order to reduce the hull weight and to improve performances during manoeuvrings. These tasks have been interactively simulated in the virtual environment of the boat CAD model, where longitudinal and transversal reinforcements were enlightened and the maximum beam reduced. At the same time, results of FEM simulations on the modified model were analysed in order to verify the structural integrity. Shape modifications have been applied to the real model in laboratory and the resulting hull has been instrumented with strain gauges and tested under rigging conditions to validate the numerical procedure. Finally, the FEM model was used to predict the response of the boat to loading systems typical of sailing conditions.

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A multi-technique simultaneous approach for the design of a sailing yacht

Cited by 16 publications

References 22 publications

A reverse engineering approach to measure the deformations of a sailing yacht

A reverse engineering approach to measure the deformations of a sailing yacht

Thermo-Mechanical Behaviour of Flax-Fibre Reinforced Epoxy Laminates for Industrial Applications

Using FEM simulation to predict structural performances of a sailing dinghy

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