Development methodology based on numerical simulation applied ...

Development methodology based on numerical simulation applied to a new composite pleasure boat Andrea Crucianelli

AYT – FERRETTI GROUP

Via Morse 18 – 47100 Forlì – ITALY [email protected]

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FERRETTI GROUP is world leader in designing and building of luxury composite yachts and composite and metal megayachts FERRETTI GROUP is 9 brands

Historical brand of luxury yachts High performance open Fast open yachts. made in Italy. Customised flying bridge yachts. Large composite and metal ships. Brightly coloured lobster open yachts. Italian style flying bridge Traditional yachts from Sorrento. American Fishermans. cruising yachts. Planing hulls 40’bridge. to 128’ 75’. long. Open and flying Semi-planing hulls 97’ to Displacement 43 to 70 metres. Planing hulls 44’ tobridge 74’ long. yachts. Open and luxury new flying range. Planing hulls 36’ to 80’. 37’ to 115’. Planing hulls Planing 33’ to 115’ long. Displacement hulls 33long. metres. Planing hulls 47’ to 88’ 28’26 toto 80’ long. Planinghulls hulls

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Ferretti Group boats are well known among motor-yacht fans and sea lovers for:


reliability of the products
seakeeping
cure of the details
worldwide distribution of customer service
top level architectural interior design

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The technical support is provided by the central Engineering Division

AYT is based in Forlì, near Bologna, close to the Ferretti Group Headquarters. It counts 35 people. 4

The structural department of AYT is composed by 3 Aerospace Engineers (on their own partly skilled on FEM/FEA softwares and Hypermesh in particular by previous experiences) and 2 technicians. At the end of 2005, Ferretti Group and AYT agreed to adopt Altair Hyperworks package for structural analysis. Ferretti Group was the first luxury yachts shipyard in the world to use FEM/FEA software for structural analysis.

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Thanks to an incomparable modelling flexibility, in these 3 years, many boat projects were developed with HYPERMESH software. Main advantages achieved:
~10% weight saving of the composite components due to structural optimizations;
~15% raw materials cost saving due to deeper engineering;
~10% production time saving (almost 90% of composite production is by Hand Lay-Up)
sensible contribution to the long time transformation from hand-crafted (typical reality of luxury shipyards) to industrial approach.

Riva 115’

Ferretti Yachts 83’ 6

Using FEM/FEA properties, special design problems were handled and solved.

STRUCTURAL BONDING of stiffening Spider-Frames

elements) Spider-Frames Mesh (plate Ferretti Non structural Yachts sole 51’ running Mesh Spider-Frame Bulkheads Deck Mesh Mesh Mesh Hull Mesh (plate elements) Engine Complete Bertram room Deck Spider-Frame 41’ boat mesh running mesh mesh Others Superstructure Stiffeners Mesh Mesh Structural Adhesive Hull Mesh Mesh (solid elements) 7

Actual Production

HullBoat lamination Preparation of running structural Spider-Frame completely bonded Actual Spider-Frame bonding Tracing of adhesive tracks (byadhesive Infusion inready female pump andmould) gun and 8

One of the latest projects by FERRETTI GROUP is ITAMA 75
23 meters of length isknots reallyofan high-tech, high performance
45 maximum speed (faster than 80 km/h) thanks tocomposite Arneson® propelling pleasuresystem vessel
structural optimization by HYPERWORKS software allowed for  Hull in hand lay-up lamination with Glass and KEVLAR fibres, to give lightness, strength and high impact resistance  Deck in infusionLongitudinal process with glass and carbon fibres, Hull mesh Structural liner Side Bulkheads stiffeners mesh mesh Deck mesh Transversal stiffeners mesh Complete boat to give great lightness and high stiffness Rendering anticipation ITAMA 75 prototype launched 9

WORK in PROGRESS At the moment, several different projects are under construction. Among them, the most significant are...

Bertram 80’ Apreamare Maestro Mochi Craft Hybrid Propulsion Long80’ Rang 23 metres 10

THE FUTURE With over 30 new projects scheduled in the next 3 years, FERRETTI GROUP will have many challenges to fulfil. ALTAIR will have many other opportunities to prove its reliability and properties. 11

Thank YOU. 12