Ships – Towing or pushing – Towing by means of cable
Reexamination Certificate
2000-11-24
2002-12-17
Morano, S. Joseph (Department: 3617)
Ships
Towing or pushing
Towing by means of cable
C367S016000
Reexamination Certificate
active
06494158
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to towing devices and more particularly tow cables with vibration damping means.
(2) Brief Description of the Prior Art
For towed components such as arrays or streamers, strum (vortex-induced vibration) is a persistent problem. Such vibration is transmitted into the towed array or streamer, causing damage to internal components.
The prior art includes a number of patents addressed to the management of such forces in cables.
U.S. Pat. No. 5,214,244 to Cummings et al., for example, discloses an underwater cable having a flexible, elongated core surrounded by a flexible, elongated jacket. A distributed jacket includes a helically displaced phase shifter to decouple the cable from strumming produced by shedding of von Karman vortex streets from the cable.
U.S. Pat. No. 5,601,046 to Berglund discloses a variable gap, distributed-capacitance sensor that provides an output signal that is a function of its instantaneous elongation. The sensor is integrally associated with a seismic isolator section for measuring the instantaneous stretch thereof.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a still better method for reducing strum in tow cables.
The present invention is a method for reducing strum in a tow cable extending from a marine vessel. Such cables have an adjustable length. The length of the cable is adjusted so that the number of longitudinal waves is an integral number.
REFERENCES:
patent: 3596070 (1971-07-01), McCool et al.
patent: 3801071 (1974-04-01), Barron
patent: 3860899 (1975-01-01), Watlington
patent: 3884173 (1975-05-01), Fabula
patent: 4210897 (1980-07-01), Hutchins
patent: 4281402 (1981-07-01), Kruka et al.
patent: 4314363 (1982-02-01), Thigpen et al.
patent: 4570245 (1986-02-01), Thigpen
patent: 4581723 (1986-04-01), Savit
patent: 4910715 (1990-03-01), Savit
patent: 5275120 (1994-01-01), Ruffa et al.
patent: 5381909 (1995-01-01), Warnan
patent: 5790472 (1998-08-01), Workman et al.
patent: 6244204 (2001-06-01), Weyman
Kasischke James M.
McGowan Michael J.
Morano S. Joseph
Oglo Michael F.
The United States of America as represented by the Secretary of
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