EP0448460B1 - Einrichtung zur Aufhängung einer akustischen Basis - Google Patents

Einrichtung zur Aufhängung einer akustischen Basis Download PDF

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Publication number
EP0448460B1
EP0448460B1 EP91400734A EP91400734A EP0448460B1 EP 0448460 B1 EP0448460 B1 EP 0448460B1 EP 91400734 A EP91400734 A EP 91400734A EP 91400734 A EP91400734 A EP 91400734A EP 0448460 B1 EP0448460 B1 EP 0448460B1
Authority
EP
European Patent Office
Prior art keywords
base
dome
tie
acoustic
boat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91400734A
Other languages
English (en)
French (fr)
Other versions
EP0448460A1 (de
Inventor
François Warnan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0448460A1 publication Critical patent/EP0448460A1/de
Application granted granted Critical
Publication of EP0448460B1 publication Critical patent/EP0448460B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
    • G10K11/006—Transducer mounting in underwater equipment, e.g. sonobuoys

Definitions

  • the present invention relates to devices which allow the acoustic bases to be suspended so as to be able to combat the effects of swell.
  • Acoustic bases i.e. sets of acoustic transducers which make it possible to receive or emit acoustic signals in water, in particular for sonars, are often fixed under the hull of a boat to the inside a protective envelope called a sonar dome, itself generally filled with an acoustically adapted protective liquid.
  • a sonar dome a protective envelope
  • the acoustic beam both in emission and in reception, follows the movements of the base and it quickly becomes necessary to compensate for these displacements.
  • electronic compensation is possible, it is generally preferred, at least to compensate for the most significant movements, to suspend the base so that it tends to remain vertical despite these movements of the boat.
  • the base swings angularly around its point of suspension from the hull.
  • the dome it is usual, for mechanical reasons as well as for hydrodynamic reasons, to rigidly fix the dome to the hull of the boat and to suspend the base inside this dome in which it oscillates relatively freely.
  • the base is generally suspended so as to be able to oscillate laterally with respect to the axis of the boat, which compensates for the rolling movements, while being rigidly fixed relative to the longitudinal axis, which causes it to follow the pitching movements which are of lower importance than those of roll.
  • German patent application No. 3312452 has also proposed a device for suspending an acoustic transducer placed in a protective dome, which uses a complicated system of rods, pulleys and cables. The complication of this system obviously leads to excessive production and maintenance costs.
  • the invention provides a device according to claim 1.
  • Figure 1 there is shown a cross section with respect to the axis of the boat carrying a sonar dome 9 protecting an acoustic base 2 suspended from the lower part of the hull of a carrying boat using two rods 3 and 4 articulated, on one side on the upper face of the base by ball joints 7 and 8, and on the other side on the hull of the boat by ball joints 5 and 6.
  • the base moves for example from left to right while approaching the right part of the dome, it undergoes a movement of rotation in a clockwise direction, which tends to make the lateral face 12 of the base substantially parallel to the inner surface of the sonar in look of this face.
  • the lower corner 11 of this base is much less close to the dome than in the case of the conventional angular suspension, while the upper right corner 13 is much closer, which is of little importance since the clearance between this corner and the dome is much more important than for corner 11.
  • the protective fluid which fills the interior of the dome is less stressed during stirring, which facilitates the movements of the base instead of hindering them and avoids the stresses of this fluid on the hydrophones, sources of noise. unwanted parasites.
  • the dimension of the rods and the arrangement of the fixing points is not critical, except that the instantaneous center of rotation R must always be located above the center of gravity G of the base. In fact, in the opposite case, the base would tend to swing upside down, which would give an opposite result to that expected.
  • the analytical resolution of the problem is relatively difficult. By cons an approximate solution to obtain the The desired movement corresponding to surface-to-surface contact during a possible impact is easy to obtain by those skilled in the art using a few preliminary graphic tests.
  • FIG. 2 shows the roll angle ⁇ of the sonar base as a function of the roll angle ⁇ of the boat.
  • dotted lines we have the bisector which would correspond to a fixed link between the base and the boat.
  • solid lines we have the angle corresponding to the situation in Figure 1.
  • this angle is significantly lower for small inclinations, which corresponds to the desired effect of the suspension of the base. This angle gradually increases to approach an asymptote corresponding to the stop against the walls of the shell.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Claims (2)

  1. Vorrichtung mit einer akustischen Basis (2), die in eine Schutzhaube (9) eingeschlossen ist, dadurch gekennzeichnet, daß diese Vorrichtung außerdem zwei Stangen (3, 4) besitzt, die über Gelenke (7, 8) an der akustischen Basis befestigt sind, und daß diese Stangen über Gelenke an der Unterseite eines Schiffsrumpfs so befestigt werden können, daß diese Stangen geneigt sind, so daß die die Gelenkpunkte jeder Stange verbindenden Geraden sich in einem Punkt (R) schneiden, der oberhalb des Schwerpunkts (G) der akustischen Basis liegt.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Länge der Stangen (3, 4) und die Lage der Gelenkpunkte (5, 6) es der akustischen Basis (2) erlauben, sich der Innenwand der Schutzhaube (9) durch eine Drehung so anzunähern, daß bei einem eventuellen Anstoßen der Basis an dieser Innenwand der Haube Fläche gegen Fläche stößt.
EP91400734A 1990-03-23 1991-03-19 Einrichtung zur Aufhängung einer akustischen Basis Expired - Lifetime EP0448460B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9003747 1990-03-23
FR9003747A FR2660144B1 (fr) 1990-03-23 1990-03-23 Dispositif de suspension pour base acoustique.

Publications (2)

Publication Number Publication Date
EP0448460A1 EP0448460A1 (de) 1991-09-25
EP0448460B1 true EP0448460B1 (de) 1994-12-14

Family

ID=9395053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400734A Expired - Lifetime EP0448460B1 (de) 1990-03-23 1991-03-19 Einrichtung zur Aufhängung einer akustischen Basis

Country Status (5)

Country Link
US (1) US5091894A (de)
EP (1) EP0448460B1 (de)
CA (1) CA2038462A1 (de)
DE (1) DE69105790T2 (de)
FR (1) FR2660144B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2676725B1 (fr) * 1991-05-21 1998-01-09 Thomson Csf Treuil pour remorquage d'objets immerges.
FR2714663B1 (fr) * 1993-12-30 1996-01-26 Thomson Csf Treuil à moteur hydraulique, notamment pour hélicoptère muni d'un sonar.
FR2735645B1 (fr) * 1995-06-16 1997-07-25 Thomson Csf Emetteur acoustique remorque
US6301426B1 (en) 1999-03-16 2001-10-09 Molecular Optoelectronics Corporation Mechanically adjustable fiber optic attenuator and method employing same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1348538A (en) * 1920-08-03 Tlakb
CA447188A (en) * 1948-03-09 R. Harry William Submarine signal device
US1401024A (en) * 1917-11-12 1921-12-20 Submarine Signal Co Diaphragm-mounting
US2582994A (en) * 1943-06-04 1952-01-22 Geophysical Res Corp Underwater microphone
US2832944A (en) * 1945-10-01 1958-04-29 Gen Electric Stabilized mounting for underwater sound apparatus
JPS60628B2 (ja) * 1977-03-10 1985-01-09 古野電気株式会社 水中探知機の送受波器姿勢制御装置
DE2732254A1 (de) * 1977-07-16 1979-01-25 Vdo Schindling Einrichtung zum einbau eines schwingers eines echolots an einer bootswand
US4462094A (en) * 1980-06-19 1984-07-24 Mobil Oil Corporation Method and apparatus for determining angle of inclination of seismometer and leveling seismic motion detectors
DE3312452A1 (de) * 1983-04-07 1984-10-11 Honeywell-Elac-Nautik Gmbh, 2300 Kiel Halte- und stabilisierungsvorrichtung fuer einen wasserschallwandler

Also Published As

Publication number Publication date
DE69105790T2 (de) 1995-04-27
FR2660144A1 (fr) 1991-09-27
FR2660144B1 (fr) 1992-05-29
EP0448460A1 (de) 1991-09-25
US5091894A (en) 1992-02-25
CA2038462A1 (fr) 1991-09-24
DE69105790D1 (de) 1995-01-26

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