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Experimental investigation of hydrodynamic loads and pressure distribution during a pyramid water entry |
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| Affiliation: | 1. Australian Maritime College, University of Tasmania, TAS 7248, Australia;2. Arab Academy for Science, Technology and Maritime Transport, Alexandria 1029, Egypt;3. University College London, London WC1E 7JE, UK;4. Centre for Advanced Composite Materials, University of Auckland, Auckland 1023, New Zealand;1. ENSTA Bretagne, FRE CNRS 3744, IRDL, F-29200 Brest, France;2. University of Technology, Iraq;1. DICAM, University of Bologna, Bologna 40136, Italy;2. Department of Technologies, University of Naples “Parthenope”, Naples 80143, Italy;3. Department of Mechanical and Aerospace Engineering, Polytechnic School of Engineering, New York University, Brooklyn, NY 11201, USA;4. DEIM – Industrial Engineering School, University of Tuscia, Viterbo 01100, Italy;1. Department of Mechanical and Aerospace Engineering, New York University Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA;2. Università degli Studi Niccolò Cusano, Via Don Carlo Gnocchi 3, 00166 Rome, Italy |
| Abstract: | In the maritime environment slamming is a phenomenon known as short duration impact of water on a floating or sailing structure. Slamming loads are local and could induce very high local stresses. This paper reports a series of impact test results and investigate the slamming loads and pressures acting on a square based pyramid. In this study the slamming tests have been conducted at constant velocity impact with a hydraulic high speed shock machine. This specific experimental equipment avoids the deceleration of the structure observed usually during water entry with drop tests. Three velocities of the rigid pyramid have been used (10, 13 and 15 m s−1). Time-histories of local pressures, accelerations and slamming loads were successfully measured. The relationship between the pressure magnitude and the impact velocity is obtained and the spatial distribution of pressures on pyramid sides is characterized. The impact velocity was found to have a negligible influence in predicting the maximum pressure coefficient. |
| Keywords: | Pyramid slamming tests Constant impact velocity Pressure distribution Pressure coefficient Slamming load |
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