Stabilizing bluff structures against oscillation

Details Stabilizing bluff structures against oscillation Stabilizing bluff structures against oscillation

1983-01-04

1985-03-19

Corbin, David H.

Hydraulic and earth engineering

Marine structure or fabrication thereof

Structure protection

405 22, E02B 1700

Patent

active

045056170

ABSTRACT:
Method and apparatus for stabilizing an upright structure such as a pile against transverse oscillation due to the relative horizontal motion of the sea past it. Gas is discharged from orifices formed either in a ring duct surrounding the pile, or in the wall of the pile itself. The bubbles tend to rise within the region of low-pressure which forms closely downstream of the pile, so breaking the synchronism of the known vortex-shedding mechanism that can promote the transverse oscillation. A perforated shroud may surround the structure and the bubbles may rise within the gap between structure and shroud. Such a shroud may itself have some stabilizing property even when the gas supply is turned off.

REFERENCES:
patent: 3148509 (1964-09-01), Laurie
patent: 3193260 (1965-07-01), Lamb
patent: 3248886 (1966-05-01), Blenkarn
patent: 3470700 (1969-10-01), Quaine et al.
patent: 3553968 (1971-01-01), Armistead
patent: 3686887 (1972-08-01), Bruce

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