1,720,974 research outputs found
Structural behaviour of landing deck marine vessel under dynamic actions of aircraft landing
No full textThe behaviour of landing deck structures, submitted to the dynamic actions induced by the landing of an aircraft is herein faced. Time dependent force laws, suitable to describe the actions due to the aircraft landing are investigated, starting from available experimental data. Non linear analyses are then developed by finite element models, aimed to investigate the behaviour of the structure under dynamic actions. Comparisons are performed with the results obtained by using the register’s codes, though verifying the effective security coefficients included in the proposed scantling criteria
On the non-linear analysis methodologies for thin spherical shells under external pressure with different finite element codes
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Structural Design of an Innovative Passenger Vessel
No full textThe main features are described related to the development of an innovative passenger ship, starting from the concept design up to the final realization of the real scale prototype. The vessel herein enlightened is represented by a very unconventional solution for the employment in the short range passenger traffic with a low environmental impact. The proposed solution has been inspired by both hydrofoil and SWATH technologies with the aim of matching relatively high transfer speeds, low environmental impact and reduced wave washing phenomena. The acronym for this hybrid vessel has been chosen in ENVIROALISWATH, a term which indicates all the mentioned design characteristics.
The Department of Naval Architecture of the University of Genova cooperated with Rodriquez Cantieri Navali to develop the complete design of this new vessel. The present works describes the development of the structure design
Design Features of an Unconventional Passenger Vessel with Low Environmental Impact
No full textThe paper refers to an unconventional passenger vessel which matches hydrofoil and SWATH principles in order to achieve high transfer speed, low environmental impact and reduced wave washing phenomena. This innovative, hybrid vessel, called ENVIROALISWATH, should be able to provide high performances, manoeuvrability and controllability typical of hydrofoils and, at the same time, good sea keeping qualities and low installed power, typical of SWATH solution. The design has been developed through a joint research program between Rodriquez Cantieri Navali S.p.A of Messina and the University of Genova. In this paper the main phases of the structural design are described.
At first a preliminary scantling of the main cross section was performed, applying the regulations for High Speed Craft (HSC) of three different classification Societies: Registro Italiano Navale, American Bureau of Shipping and Det Norske Veritas. Preliminary studies, on simplified numerical models, are also performed to evaluate the mutual interaction between the hull and the submerged structure.
The main information have been collected in order to setup a finite element model suitable to simulate the behaviour of the structure as a whole. Starting from this model subsequent implementations have been carried out improving the investigation of stress and strain distributions. Local and global effects have been considered. For the numerical detailed investigation the FEM code Maestro has been used for both complete model and structural detail analysis
Progettazione antisismica di piattaforme offshore: analisi dei criteri proposti dalle normative
No full textLight structure design for an unconventional passenger vessel with low environmental impact
No full textThis paper refers to an unconventional passenger vessel which matches hydrofoil and SWATH principles in order to achieve high transfer speeds, low environmental impact and reduced wave washing phenomena. This new, hybrid vessel, called ENVIROALISWATH, should be able to provide high performances, manoeuvrability and controllability typical of hydrofoils and, at the same time, good sea keeping qualities and low installed power, typical of SWATH solution. The design has been developed through a joint research program between Rodriquez Cantieri Navali S.p.A of Messina and the University of Genova. In this paper the final verifications of the structural design are described.
After a preliminary scantling of the main cross section, carried out by applying existing HSC Rules, the structure has been refined by separate numerical models of the hull and of the submerged body.
The gathered information have been collected in order to setup a finite element model suitable to simulate the behavior of the structure as a whole. Starting from this model subsequent implementations have been carried out improving the investigation of stress and strain distributions. Local and global effects have been considered. For the numerical detailed investigation the two FEM codes Maestro and Ansys have been used and the results compared, so verifying their reliability
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