Experimental Investigation of Elasticity Effects on Slamming
Elasticity effects on slamming was investigated by dropping a flat plate onto the water surface. The experimental work was carried out in the ocean basin at Plymouth University’s COAST Laboratory. The ocean basin is 35 m long by 15.5 m wide and has an adjustable floor that allows operation at different water depths up to 3 m. The falling block includes a rigid impact plate connected to two driver plates and its total mass can be varied between 32 kg to 52 kg. A spring system was used to form elastic plates and elasticity of the plate could be changed using different spring stiffness. The impact plate has dimension of 0.25 m long, 0.25 m wide and 0.012 m high. Pressures under the impact plate were measured during impact by several pressure transducers (FGP Sensors XPM10 having measurement range of up to 100 bar) installed on the impact plate. Result shows that elasticity of the impact plate has a significant effect on impact loads, with impact loads being considerably reduced by decreasing the plate-stiffness.
KeywordsSlamming Elasticity Physical model Impact
This study was a part of the FROTH (Fundamentals and Reliability of Offshore sTructure Hydrodynamics) project supported by the Engineering and Physical Science Research Council (EPSRC Grant EP/J012866/1). The FROTH project was led by Plymouth University and the collaborative partners include Oxford University, University of Bath, City University London and the Manchester Metropolitan University. The authors gratefully acknowledge the financial support provided by EPSRC and useful discussions with the partners.
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