Communications – electrical: acoustic wave systems and devices – Sonar counter-measures
Patent
1990-11-15
1992-07-14
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Sonar counter-measures
181140, 181402, 114312, 310328, H04K 300
Patent
active
051309483
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a method for reducing acoustic emission from submerged submarines wherein moving mechanical elements in the inner region transfer vibrations to an outer hull via a transport path and the vibrations are attenuated on the transport path.
The invention further concerns an apparatus for the reduction of acoustic emission of submerged submarines with which damping means are arranged between a moving mechanical element in the inner region of the submarine and an outer hull.
With the invention the submarines should, in particular, become camouflaged.
This application is related to the following co-pending U.S. Applications filed on Nov. 15, 1990: SOURCE, IN PARTICULAR OF A SUBMERGED SUBMARINE, AND SUBMARINE", Ser. No. 614,300, filed Nov. 15, 1990, corresponding to International Application PCT/DE 90/00197; SUBMARINES", Ser. No. 615,432, filed Nov. 15, 1990, corresponding to International Application PCT/DE 90/00193; OPTICAL OBSERVATION SYSTEM", Ser. No. 602,314 filed Nov. 15, 1990, corresponding to International Application PCT/DE 90/00196; SUBMARINES AND SUBMARINES", Ser. No. 602,317, filed Nov. 15, 1990, corresponding to International Application PCT/DE 90/00194; ACOUSTIC EMISSION FROM SUBMERGED SUBMARINES", Ser. No. 614,200, filed Nov. 15, 1990, corresponding to International Application PCT/DE 90/00195; and OPERATING SUBMERGED SUBMARINES".
Each of the above-identified applications is assigned to the assignee of the present application, and the disclosures thereof are hereby incorporated by reference into this application.
Within the scope of submarine combat, one uses both active as well as passive systems to locate submarines.
With active systems (for example SONAR), a search signal, in general, an acoustic signal in the sonic or infrasonic region is radiated from on board a search vehicle, for example, from a frigate. These acoustic signals are reflected from the outer surface of the submarine and reach receivers on board the searching vehicle such that, from these received signals, by means of suitable analysis procedures, the position of the submarine can be determined.
It is known in the art that, in order to protect submarines from such active position-finding methods, the submarine is furnished with a coating on its outer hull which absorbs, as well as possible, the impinging acoustic signals.
An underwater vessel which is intended to be camouflaged from detection by low frequency active sonar, that is, a active acoustic locating system, is known in the art from DE-OS 33 32 754. Towards this end, wide band wedge-shaped absorbers are arranged, in particular, on the bow and on the bow side of the tower area which, for their part, are fitted to the respective ship contours and which, themselves, have no acoustic reflection properties. In this manner the detectability of the submarine, namely the so-called target size, should be reducible by approximately 10 to 15 dB.
The reduction of turbulent flow around submerged parts of submarines through the introduction of chemical additives has also been proposed (DE-OS 23 18 304).
Passive location methods, on the other hand, exploit physical phenomena caused by the submarine itself. In this manner, for example, it is known in the art that the perturbation on the earth's magnetic field by the submarine's metallic parts can be exploited in order to locate submarines. Accordingly, locating probes are known in the art which are based on the principle of nuclear magnetic resonance and which are towed by ships or airplanes on a long line over the region of the sea being searched in order to detect distortions in the earth's magnetic field.
A further passive locating method as is, for example, described in EP-PS 63 517, EP-OS 120 520 as well as in EP-PS 213 418 is based on the measurement of acoustic signals which are radiated from the submarine. Namely, a submarine radiates sound into the surrounding sea water to the extent that moving parts in the submarine transfer vibrations to the outer hull. Primarily, measurable acoustic signals are produced
REFERENCES:
patent: 4083433 (1978-04-01), Geohegan et al.
German Journal Militartechnik Apr. 1981, "Einsatz von Dampfungselementen zur Larm- und Schwingungsbekampfung" from R. Berger and F. Kupke, pp. 210-212.
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German Book from Gabler "Unterseebootbau", vol. 3, Koblenz 1987, p. 72.
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German Journal Schiff und Hafen, 17.vol. Journal Dec., 1965 "Schalltechnische Erfahrungen mit doppelelastischen Maschinenlagerungen" from A. A. Mueller, p. 989.
Kasten Arne
Laukien Gunther
Eldred J. Woodrow
Laukien Gunther
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