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Parametric Analysis of Slamming Forces: Compressible and Incompressible Phases
Campana, E.F.,Carcaterra, A.,Ciappi, E.,Iafrati, A. The Society of Naval Architects of Korea 2000 Journal of ship and ocean technology Vol.4 No.1
The slamming force occurring in the free fall impact of cylindrical bodies on the water surface is analyzed in both compressible and incompressible stages. In the compressible phase the hydrodynamic analysis is carried on by the acoustic approximation, obtaining a closed form expression for the maximum impact force. The incompressible analysis is approached through and unsteady boundary element method to compute the free surface evolution and the slamming force on the body. A similar behavior seems to characterize the maximum slamming force versus a dimensionless mass parameter.
Similitudes for the structural response and radiated sound power of simply supported plates
Robin, Olivier,Margherita, Pasquale,De Rosa, Sergio,Berry, Alain,Franco, Francesco,Ciappi, Elena Techno-Press 2019 Advances in aircraft and spacecraft science Vol.6 No.6
This communication investigates exact and distorted similitudes and the related scaling laws for the analysis of both dynamic response and radiated power of rectangular plates. The response of a given panel in similitude from another one is determined from a generalization of the modal approach, allowing the use of mode shapes, natural frequencies and finally radiation functions in order to establish appropriate scaling laws. Analytical models of simply supported rectangular plates are used to produce both original and replica model responses under point mechanical excitation. Emphasis is then especially put on laboratory experiments which are performed on baffled simply supported aluminum panels under mechanical excitations. All the six possible scaling directions, i.e. predicting a plate vibroacoustic reponse from another plate, are reported. All obtained results show that structural response or radiated sound power of a given plate can be both recovered with satisfactory accuracy by using the related scaling laws, even if parent models are used.