Asymmetric Hydrodynamic Impact and Dynamic Response of Vessels

[+] Author and Article Information
L. Xu

Research and Development Department, American Bureau of Shipping, Two World Trade Center, New York, NY 10048

A. W. Troesch

Department of Naval Architecture and Marine Engineering, North Campus, The University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145

R. Peterson

Coastal Systems Station, Dahlgren Division, Naval Surface Warfare Center, Panama City, FL 32407-7001

J. Offshore Mech. Arct. Eng 121(2), 83-89 (May 01, 1999) (7 pages) doi:10.1115/1.2830082 History: Received March 15, 1998; Revised December 20, 1998; Online December 17, 2007


Theoretical simulations are compared with drop test experiments of vessel free-fall impact on calm water, with zero and nonzero initial heel angles. The impact force and moment are predicted by using a theory described in Xu et al. (1998). The resulting motions of vessels at asymmetric impact include vertical water entry and transverse rolling. The downward deceleration equation combines the hydrostatic and hydrodynamic forces and the weight of hull, while the rolling equation takes into account the restoring moments due to asymmetry. Another simplified approach of a water entry dynamics and injury model (Gollwitzer and Peterson, 1996) is also applied to evaluate the impact acceleration for symmetric cases. The experiments were conducted at the Coastal Systems Station, Panama City, Florida, using a 2 ft × 8 ft (0.61 m × 2.44 m) prismatic hull model with 20 deg deadrise. The comparisons between the asymmetric impact theory and experiment shows varying degrees of qualitative and quantitative agreement.

Copyright © 1999 by The American Society of Mechanical Engineers
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