2026-09-24T03:05:24Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/96052021-07-05T14:03:20Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Dick K.P. Yue.
Mei, Xiaoming, 1972-
Massachusetts Institute of Technology. Department of Ocean Engineering
2005-08-19T18:52:23Z
2005-08-19T18:52:23Z
1998
1998
http://hdl.handle.net/1721.1/9605
42243156
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998.
Includes bibliographical references (leaves 85-87).
When an object drops into the water a slamming load with high pressure on the body happens. Such an impact force often causes serious structure damage to the ships and offshore structures. The study of the water-entry impact problem is thus of fundamental interest and practical significance in naval architecture and marine engineering. We analytically study the water-entry problem of an arbitrary two-dimensional object. The linearized formulation of Wagner (1932) for wedges of small deadrise angles is adopted and extended to general body geometries with the boundary condition on the body satisfied exactly. For wedges and circular cylinders, we derive closedform solutions by using the conformal mapping techniques for the exact solution of the boundary-value problem at any instant. The analytical solutions are confirmed by comparisons to the physical experiments and the fully-nonlinear simulation results for wedges and by comparisons to the existing experiments for circular cylinders. for arbitrary ship-like bodies, we also develop a general solution scheme based on the use of Lewis-form representation of the body geometry. It is applied to wedge and circular cylinder and agrees with the exact solutions very well. For illustration, the solutions for the case of parabolic section and a bow flare section arc also presented
by Xiaoming Mei.
S.M.
87 leaves
3899875 bytes
3899634 bytes
application/pdf
application/pdf
eng
Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Ocean Engineering
On the impact of arbitrary two-dimensional sections
Thesis
application/pdf
Publication
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unknown
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<Abstract>When an object drops into the water a slamming load with high pressure on the body happens. Such an impact force often causes serious structure damage to the ships and offshore structures. The study of the water-entry impact problem is thus of fundamental interest and practical significance in naval architecture and marine engineering. We analytically study the water-entry problem of an arbitrary two-dimensional object. The linearized formulation of Wagner (1932) for wedges of small deadrise angles is adopted and extended to general body geometries with the boundary condition on the body satisfied exactly. For wedges and circular cylinders, we derive closedform solutions by using the conformal mapping techniques for the exact solution of the boundary-value problem at any instant. The analytical solutions are confirmed by comparisons to the physical experiments and the fully-nonlinear simulation results for wedges and by comparisons to the existing experiments for circular cylinders. for arbitrary ship-like bodies, we also develop a general solution scheme based on the use of Lewis-form representation of the body geometry. It is applied to wedge and circular cylinder and agrees with the exact solutions very well. For illustration, the solutions for the case of parabolic section and a bow flare section arc also presented</Abstract>
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