Dynamic Response of Submerged Shells With Appendages
by Stephen D. O’Regan, A.M.ASCE, (Member of Technical Staff, AT&T Bell Labs., 1201 S. Hayes St., Arlington, VA 22202) and Frank DiMaggio, F.ASCE, (Prof., Dept. of Civ. Engrg. and Engrg. Mech., Columbia Univ., New York, NY 10027)
Journal of Engineering Mechanics, Vol. 116, No. 10, October 1990, pp. 2275-2292, (doi: http://dx.doi.org/10.1061/(ASCE)0733-9399(1990)116:10(2275))
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Journal Paper |
| Abstract: |
To determine the dynamic response of submerged structures with complex internal structures to shock loading, it is often necessary to uncouple the equations of motion of the infinite surrounding fluid from those of the structure by means of acoustic approximations. The addition of external appendages to a submerged convex structure can create local concavities in the structure’s surface. When subjected to pressure waves traveling through the surrounding fluid, these concavities permit multiple reflections, which cannot be tracked using the acoustic approximations on the wet surface of the structure. By applying an acoustic approximation to a convex fluid surface circumscribing the structure, a method is developed that can be used to compute the motion of the structure. It is found that the multiple reflections caused by concavities significantly affect the structural response when the size of the appendages approaches or exceeds the characteristic dimensions of the convex structure. |
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