The impact of an elastic plate onto the compressible fluid without free surface deformation is considered. The ability of the liquid volume to be deformed is geometrically limited which leads to severe impact conditions. The present analysis is focused on the stresses in the plate and the hydrodynamic loads under the impact. The motivation for this research comes from ship hydrodynamics, where the hulls of a catamaran restrict the liquid outflow and the water impacts onto the wetdeck. The influence of the air on the impact process is investigated. The analysis did not reveal any great advantage of utilizing the air-cushion effect or ejection of air into the water near the impact region to prevent high stresses in the elastic plate. It was found that: any possibility of restricting the liquid flow near the impact has to be avoided at the design stage; the air-cushion effect reduces the loads on the bottom platings significantly, but the loads last longer; the quasi-statical approach underpredicts the stress level; the simplified model described in Section 5 can be recommended for the analysis of the water impact if the liquid motion is restricted; aeration of the water near the impact region does not lead to the reduction of the stresses in the elastic platings; the maximum stress can occur far from the plate centre what must be taken into account before the experiment design; from the point of view of structural analysis, the magnitude of the loads on the impacting plate does not give sufficient information for the estimation of the stresses in the plate.
Elastic response of catamaran wetdeck to liquid impact
Das elastische Verhalten eines Katamaran-Naßdecks bei Wasserstößen
Ocean Engineering ; 25 , 8 ; 687-714
1998
28 Seiten, 16 Bilder, 16 Quellen
Article (Journal)
English
Bootsbau , Katamaran , Schiffsrumpf , Platte (Theorie) , elastische Eigenschaft , Stoßwelle , Hydrodynamik , Spannungsverlauf (mechanisch) , Wasserwelle , Rechenmodell , Modalparameter , Luftkissen , analytische Untersuchung , Luftströmung , mathematische Ableitung , Euler-Gleichung , Strukturanalyse
Catamaran Wetdeck Structural Response to Wave Impact
British Library Conference Proceedings | 2001
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