Hydraulic and earth engineering – Marine structure or fabrication thereof – Floatable to site and supported by marine floor
Patent
1990-01-30
1992-03-24
Reese, Randolph A.
Hydraulic and earth engineering
Marine structure or fabrication thereof
Floatable to site and supported by marine floor
405210, 405211, E02D 2302
Patent
active
050982265
ABSTRACT:
An apparatus and method for dynamic absorption and damping of horizontal perturbations of a marine structure due to marine forces is disclosed. The apparatus includes an absorber tank having an internal toroidal shape, attached to the structure. The tank is to be partially filled with at least one liquid, e.g. water, and is arranged so as to be tuned to damp low frequency marine excitations, e.g. a subharmonic excitation frequency of the particular marine structure. The method includes constructing such a toroidal absorber tank, tuning the tank to the desired damping frequency, e.g. the subharmonic excitation frequency, and installing the tank on the structure. Tuning may be accomplished by varying the depth of liquid within the tank. The apparatus and method may be used on, inter alia, free-floating and tethered structures.
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Massachusetts Institute of Technology
McBee J. Russell
Reese Randolph A.
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