FR2840583A1 - MULTI INFLUENCE DREDGING SYSTEM - Google Patents
MULTI INFLUENCE DREDGING SYSTEM Download PDFInfo
- Publication number
- FR2840583A1 FR2840583A1 FR0207029A FR0207029A FR2840583A1 FR 2840583 A1 FR2840583 A1 FR 2840583A1 FR 0207029 A FR0207029 A FR 0207029A FR 0207029 A FR0207029 A FR 0207029A FR 2840583 A1 FR2840583 A1 FR 2840583A1
- Authority
- FR
- France
- Prior art keywords
- fish
- electrodes
- potential difference
- applying
- low frequency
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G7/00—Mine-sweeping; Vessels characterised thereby
- B63G7/02—Mine-sweeping means, Means for destroying mines
- B63G7/06—Mine-sweeping means, Means for destroying mines of electromagnetic type
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Means For Catching Fish (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
L'invention conceme les systèmes de dragage multi influence pour mines à déclenchement magnétique et acoustique.Elle consiste à relier deux poissons (101) formant une telle drague par un câble conducteur en forme de boucle horizontale maintenue ouverte par des paravanes (105). Les poissons sont munis d'électrodes (106) ventrales permettant de faire parcourir un courant électrique dans le milieu marin pour compléter le champ magnétique transversal et pour obtenir un champ électrique longitudinal. Ils sont aussi munis de projecteurs acoustiques.Elle permet d'obtenir un système de dragage plus léger et offrant une résistance à l'avancement plus faible.The invention relates to multi-influence dredging systems for mines with magnetic and acoustic triggering. It consists in connecting two fish (101) forming such a dredge by a conductor cable in the form of a horizontal loop held open by paravanes (105). The fish are provided with ventral electrodes (106) allowing an electric current to flow through the marine environment to complete the transverse magnetic field and to obtain a longitudinal electric field. They are also fitted with acoustic projectors, which makes it possible to obtain a lighter dredging system with lower resistance to forward movement.
Description
ouvertes. La presente invention se rapporte aux systemes de dragageopen. The present invention relates to dredging systems
destines dans le cadre de la chasse aux mines soul-marines a faire expioser celles-ci a une distance de securite du batiment remorqueur de la drague pour debarrasser le fond sous-marin des mines dangereuses pour les bateaux circulant dans les parages. Wile permet plus particulierement d'obtenir un systeme allege qui est facilement transportable, facilement intended for the hunting of underwater mines to have them expired at a safe distance from the dredger's towing vessel to rid the seabed of dangerous mines for boats operating in the vicinity. Wile more particularly makes it possible to obtain a lightweight system which is easily transportable, easily
o deployable et recuperable, et qui peut etre facilement remorque. o deployable and recoverable, and which can be easily towed.
Les systemes de dragage multi influences connus a ce jour comprennent un ensemble de poissons remorques derriere le bateau dragueur et qui vent munis de divers dispositifs permettant d'obtenir un champ magnetique variable permettant de simuler la signature magnetique d'un batiment de fort tonnage et done de leurrer les mines pour les faire exploser. Les systemes les plus anciens comportent un ensemble d'aimants permanents reglable avec plus ou moins de facilite. Un systeme plus recent brevete par la demanderesse et connu dans le commerce sous le nom de << STERNE, permet diobtenir une signature magnetique plus proche de la realite en utilisant un systeme d'electroaimants. Toutefois les poissons formant ce systeme vent relativement lourds et ils doivent en outre etre utilises en grand nombre. On obtient aiors un systeme encombrant, The multi-influence dredging systems known to date include a set of fish towed behind the dredger boat and which are fitted with various devices making it possible to obtain a variable magnetic field making it possible to simulate the magnetic signature of a vessel of large tonnage and therefore to lure mines to detonate them. The oldest systems include a set of permanent magnets, adjustable with varying degrees of ease. A more recent system patented by the applicant and known in the trade under the name of “STERNE, makes it possible to obtain a magnetic signature closer to reality by using a system of electromagnets. However the fish forming this system are relatively heavy and they must also be used in large numbers. So we get a bulky system,
difficilement deployable et manceuvrable. difficult to deploy and maneuverable.
Pour pallier ces inconvenients, I'invention propose un systeme de dragage multi influence, du type utilisant au moins deux poissons tractes 1'un derriere l'autre, et comportant au moins un solenode horizontal, principalement caracterise en ce qu'il comprend un cable conducteur reliant To overcome these drawbacks, the invention provides a multi-influence dredging system, of the type using at least two fish towed one behind the other, and comprising at least one horizontal solenode, mainly characterized in that it comprises a cable connecting conductor
les poissons pour former au moins une boucle horizontale autour de ceuxci. fish to form at least a horizontal loop around them.
Selon une autre caracteristique, iadite boucle est maintenue According to another characteristic, said loop is maintained
ouverte a 1'aide d'un ensemble de paravanes. opened using a set of paravanes.
Selon une autre caracteristique, le systeme comporte au plus trots poissons et deux boucles entourant respectivement ['ensemble premier et According to another characteristic, the system comprises at most three fish and two loops respectively surrounding the first and
deuxieme poisson et ['ensemble deuxieme et troisieme poisson. second fish and [together second and third fish.
Selon une autre caracteristique, au moins deux des poissons comprennent une electrode ventrale permettant de faire circuler un courant According to another characteristic, at least two of the fish comprise a ventral electrode making it possible to circulate a current
electrique au sein du milieu marin dans loquel est plongee la drague. electric in the marine environment where lo dredge is plunged.
Selon une autre caracteristique, il comprend des moyens pour appliquer entre ces electrodes une difference de potentiel comprenant une According to another characteristic, it comprises means for applying between these electrodes a potential difference comprising a
composante continue et une composante modulee a basse frequence. DC component and a modulated component at low frequency.
Selon une autre caracteristique, il comprend trots poissons comportant chacun une electrode et les moyens pour appliquer une difference de potentiel permettent d'appliquer une difference de potentiel continue entre deux de ces electrodes et une difference de potentiei modulee According to another characteristic, it comprises three trots of fish each comprising an electrode and the means for applying a potential difference make it possible to apply a difference in continuous potential between two of these electrodes and a difference in modulated potential.
a tres basse frequence entre l'une de ces deux electrodes et la troisieme. at very low frequency between one of these two electrodes and the third.
Selon une autre caracteristique, les moyens pour appliquer une According to another characteristic, the means for applying a
difference de potentiel vent constitues par un generateur de courant. wind potential difference constituted by a current generator.
Selon une autre caracteristique, les moyens pour appliquer une difference de potentiel vent constitues par un couple galvanique resultant de According to another characteristic, the means for applying a wind potential difference constituted by a galvanic couple resulting from
la constitution differente des electrodes entre elles. the different constitution of the electrodes between them.
Selon une autre caracteristique, la modulation tres basse frequence est obtenue par ['insertion dans le couple galvanique d'une According to another characteristic, the very low frequency modulation is obtained by the insertion in the galvanic couple of a
resistance modulable.modular resistance.
D'autres particularites et avantages de ['invention appara^'tront Other features and advantages of the invention will appear.
clairement dans la description suivante presentee a titre d'exemple non clearly in the following description presented by way of example not
limitatif en regard des figures annexees qui representent: - la figure 1, une vue en perspective diun systeme de dragage selon ['invention; - la figure 2, une vue de cote de l'un des poissons utilises dans le systeme de la figure 1; - la figure 3, une vue de dessus d'une boucle conductrice 2 horizontale utilisee dans le systeme de ia figure 1; et - la figure 4, un schema des lignes de champs electromagnetiques TBF generes par le systeme selon limiting with regard to the appended figures which represent: - Figure 1, a perspective view of a dredging system according to the invention; - Figure 2, a side view of one of the fish used in the system of Figure 1; - Figure 3, a top view of a horizontal conductive loop 2 used in the system of ia Figure 1; and - Figure 4, a diagram of the lines of electromagnetic fields TBF generated by the system according to
['invention dans le cas de la configuration de la figure 1. [The invention in the case of the configuration of Figure 1.
Le systeme selon ['invention comporte, comme represente sur la figure 1, un ensemble de deux, ou au maximum 3, poissons 101,102,103 remorques de maniere connue par un bateau tracteur, a ['aide d'un cable de remorquage electrotracteur non represente sur la figure et connu en lui meme. Ces poissons vent relies entre eux par des cables electriques 104 ss qui permettent de definir autour d'eux une boucle de courant horizontale. Ces cables vent maintenus ecartes dans le sens de la largeur par des divergents, ou paravanes, 105 connus en eux-meme qui exercent une force horizontale sous l'effet de la tranee hydrodynamique qui siexerce sur eux, permettant The system according to the invention comprises, as shown in FIG. 1, a set of two, or at most 3, fish 101,102,103 trailers in a known manner by a towing boat, using a towing cable not shown on the figure and known in itself. These fish wind linked together by electrical cables 104 ss which allow to define around them a horizontal current loop. These cables are kept apart in the direction of the width by divergent, or paravanes, 105 known in themselves which exert a horizontal force under the effect of the hydrodynamic trane which is exerted on them, allowing
d'obtenir une boucle horizontale presentant une large surface. to obtain a horizontal loop having a large surface.
Les poissons vent egalement munis d'electrodes 106 qui permettent d'engendrer dans le milieu marin des courants electriques continus eVou a basse frequence auxquels est associe un champ electrique electromagnetique a tres basse frequence, qui permet d'ameliorer les The fish also wind provided with electrodes 106 which make it possible to generate in the marine environment continuous electric currents or low frequency with which is associated an electromagnetic electric field at very low frequency, which makes it possible to improve the
phenomenes de simulations.phenomena of simulations.
o On a represente sur la figure 2 une vue en transparence de l'un de ces poissons. Celui-ci presente une structure connue, avec un corps creux allonge 107, des ailes horizontales 112, une ailette stabilisatrice 108 situee a l'arriere et une quille elle-meme stabilisatrice 109 situee en dessous de ce corps. Ce poisson comprend de maniere connue un solenode 110 a noyau ferromagnetique d'axe longitudinal situe dans le corps 107, et un projecteur acoustique 111 situe dans la quille 109. Selon ['invention, ce projecteur acoustique sera de preference a haute frequence pour le premier et le deuxieme poisson, et a basse frequence pour le troisieme. Lorsqu'il n'y a que deux poissons, le premier sera a haute frequence et le deuxieme a basse o There is shown in Figure 2 a transparent view of one of these fish. The latter has a known structure, with an elongated hollow body 107, horizontal wings 112, a stabilizing fin 108 located at the rear and a stabilizing keel 109 located below this body. This fish comprises in known manner a solenode 110 with ferromagnetic core of longitudinal axis located in the body 107, and an acoustic projector 111 located in the keel 109. According to the invention, this acoustic projector will preferably be at high frequency for the first and the second fish, and at low frequency for the third. When there are only two fish, the first will be at high frequency and the second at low
o frequence.o frequency.
Selon ['invention, le poisson comporte en outre une electrode 106 de forme hydrodynamique situee sous la paroi ventrale du corps 107 et de maniere preferentielle a ['avant de celui-ci. Selon une realisation preferentielle, chacun des trots poissons comportera une telie electrode, mats, selon une variante de realisation, seuls les deux poissons extremes According to the invention, the fish further comprises an electrode 106 of hydrodynamic shape located under the ventral wall of the body 107 and preferably before it. According to a preferred embodiment, each of the fish trots will have such a electrode, but, according to an alternative embodiment, only the two extreme fish
(dans le cas de trots poissons) comporteront cette electrode. (in the case of fish trots) will include this electrode.
L'ensemble de la drague ainsi constituee fonctionne en mode emulation pour simuler les signatures electriques, electromagnetiques et acoustiques d'un bateau de taille suffisante pour enclencher ['explosion des The entire dredger thus formed operates in emulation mode to simulate the electrical, electromagnetic and acoustic signatures of a boat of sufficient size to trigger the explosion of
so mines au-dessus desquelles la drague passe. so mines over which the dredge passes.
Pour cela, de maniere connue, la signature acoustique est delivree par les projecteurs acoustiques 111 et ies aimantations horizontales proviennent du courant I circulant dans le solenode a noyau For this, in known manner, the acoustic signature is delivered by the acoustic projectors 111 and the horizontal magnetizations come from the current I circulating in the solenode with core
ferromagnetique 1 10.ferromagnetic 1 10.
Les cables 104, ecartes par les paravanes 105, prennent la forme de boucies sensiblement ovoides, representees selon une vue de dessus sur la figure 3. Dans un exemple de realisation, ces cables vent fixes aux extremites des ailes 112 des poissons 101 qui permettent de maintenir I'immersion de ceux-ci et qui ont, dans cet exemple de realisation, une envergure sensiblement egale a trots metres. Les poissons, toujours dans cet exemple, vent eux-memes distants les uns des autres d'une longueur sensiblement egale a trente metres et vent relies par un cable de remorquage 113. Les parametres des paravanes vent alors choisis pour que o l'ouverture maximale des boucles formees par les cables 104 soit sensiblement egale a 10 metres. Ces cables horizontaux vent du type multiconducteurs, par exemple avec 20 conducteurs qui vent mis en serie pour former des boucles horizontales de 20 tours. En faisant alors circuler dans la premiere boucle un courant l' et dans la deuxieme boucle un courant s 12, modules de maniere tres lente en fonction de la vitesse d'avancement de la drague, on simu le de man iere connue le profil magnetique caracteristique The cables 104, separated by the paravanes 105, take the form of substantially ovoid sparks, shown in a top view in FIG. 3. In an exemplary embodiment, these cables are fixed at the ends of the wings 112 of the fish 101 which make it possible to maintain the immersion of these and which, in this embodiment, have a span substantially equal to three meters. The fish, still in this example, wind themselves apart from each other by a length substantially equal to thirty meters and wind connected by a towing cable 113. The parameters of the paravans are then chosen so that o the maximum opening loops formed by cables 104 is substantially equal to 10 meters. These horizontal wind cables of the multiconductor type, for example with 20 conductors which wind put in series to form horizontal loops of 20 turns. By then circulating in the first loop a current l 'and in the second loop a current s 12, modules very slowly as a function of the speed of advance of the dredge, we simulate it in a known manner the magnetic profile characteristic
d'un bateau, appele aussi signature magnetique verticale du bateau emule. of a boat, also called vertical magnetic signature of the emulated boat.
Compte tenu des grandes dimensions des boucles ainsi utilisees, on obtient un champ suffisamment intense pour representer la signature souhaitee avec un minimum de materiel, soit les cables 104 et les divergents 105. Ce materiel est outre d'une taille et d'un poids reduit. Cette reduction de taille et de poids est particulierement avantageuse par rapport a la solution connue dans l'art qui consiste a utiliser un solenolde vertical a un noyau ferromagnetique semblable a celui du solenoide 110. En effet un tel z5 solenoide est lourd et encombrant, et comme on doit pour obtenir la composante verticale du champ magnetique le disposer avec son axe vertical, on est conduit a utiliser un poisson qui presente, soit une longueur Taking into account the large dimensions of the loops thus used, a sufficiently intense field is obtained to represent the desired signature with a minimum of material, namely the cables 104 and the divergent 105. This material is also of reduced size and weight . This reduction in size and weight is particularly advantageous compared to the solution known in the art which consists in using a vertical solenoid with a ferromagnetic core similar to that of the solenoid 110. In fact such a solenoid z5 is heavy and bulky, and as one must to obtain the vertical component of the magnetic field to arrange it with its vertical axis, one is led to use a fish which presents, that is to say a length
tout a fait excessive, soit des formes massives tres peu hydrodynamiques. quite excessive, very massive forms very hydrodynamic.
En outre, on libere ainsi a la fois de la place et de la masse pour o surdimensionner eventuellement le solenoide horizontal 110, qui, de par son orientation, ne presente pas les memes problemes d'encombrement, ni de masse, compte tenu des dimensions minimales que doivent presenter les poissons 101 afin de pouvoir constituer un systeme susceptible de naviguer de maniere stable tout en presentant une resistance suffisante pour supporter les differentes tranees, en particulier celles provenant des In addition, it thus frees up both space and mass in order to possibly oversize the horizontal solenoid 110, which, by its orientation, does not present the same problems of space or mass, taking into account the dimensions minimum that fish 101 must present in order to be able to constitute a system capable of navigating in a stable manner while having sufficient resistance to support the different trenches, in particular those coming from
paravanes 105.paravanes 105.
En outre, selon ['invention, en appliquant une difference de potentiel entre les trots electrodes 106 portees respectivement par chacun des poissons 101, on fait parcourir un courant electrique dans le milieu marin dans lequel est plongee la drague, selon des lignes de courant representees par exemple sur la figure 4. Ces courants electriques vent continus ou a de tres basses frequences, en fonction des differences de potentiel appliquees aux electrodes 106. Wiles permettent ainsi de simuler les phenomenes de o corrosion du batiment emule par la drague, ainsi que leur modulation par la rotation des helices de ce batiment. Wiles permettent aussi d'obtenir un champ magnetique qui est transversal sous la quilie de la drague et qui complete de cette maniere les modulations engendrees par les solenodes In addition, according to the invention, by applying a potential difference between the electrode trots 106 carried respectively by each of the fish 101, an electric current is passed through the marine environment in which the dredge is immersed, along current lines represented. for example in FIG. 4. These electric currents wind continuously or at very low frequencies, as a function of the potential differences applied to the electrodes 106. Wiles thus make it possible to simulate the phenomena of corrosion of the building emulated by the dredger, as well as their modulation by the rotation of the propellers of this building. Wiles also make it possible to obtain a magnetic field which is transverse under the quilie of the dredger and which completes in this way the modulations generated by the solenodes
1 10, ainsi que par les boucles de courant 104. 1 10, as well as by the current loops 104.
A titre d'exemple, on peut etablir une difference de potentiel fixe entre les electrodes portees par le premier et le deuxieme poisson, ce qui permet alors d'obtenir les lignes de courant continu 114 qui peuvent ainsi bien representer les phenomenes de corrosion sur la demi partie avant du bateau emule. En appliquant alors une difference de potentiel alternatif basse frequence, et meme tres basse frequence, entre les electrodes portees par le deuxieme et le troisieme poisson, on emulera les phenomenes electrochimiques tels que ceux produits par la protection cathodique des helices du bateau sur la demi partie arriere du bateau emule, ainsi que ia modulation des courants associes a ces phenomenes electrochimiques par z5 la rotation de l'helice. Cette difference de potentiel proviendra de preference d'un generateur de courant, ce qui permet d'obtenir une impedance uniquement determinee par la surface des electrodes 106, independamment des distances entre elles. A titre de variante, on pourra utiliser un couple galvanique en fabriquant l'une des electrodes avec du zinc et l'autre avec du cuivre par exemple, et en reliant electriquement ces deux electrodes par l'intermediaire du cable 113, ou de l'un des conducteurs constituent ce cable, qui est de toute fa, con electrotracteur pour pouvoir alimenter les organes contenus dans les poissons. Eventuellement on pourra alors utiliser une resistance modulee inseree en serie entre ces deux electrodes, pour 3 representer les phenomenes alternatifs associes a la rotation de l'helice. A titre d'exemple, le courant parcourant ces electrodes aura une intensite de 5 amperes, la resistance equivalente de ['ensemble courant milieu marin etant alors sensiblement egale a quatre Ohms pour une distance inter poissons egale a 30m. Dans ces conditions, le champ magnetique transversal aura une valeur d'environ 100 nT et la composante horizontale du champ As an example, one can establish a fixed potential difference between the electrodes carried by the first and second fish, which then makes it possible to obtain the direct current lines 114 which can thus well represent the phenomena of corrosion on the half forward part of the emulated boat. By applying then a difference in alternating potential low frequency, and even very low frequency, between the electrodes carried by the second and the third fish, one will emulate the electrochemical phenomena such as those produced by the cathodic protection of the propellers of the boat on the half part stern of the emulated boat, as well as the modulation of the currents associated with these electrochemical phenomena by z5 the rotation of the propeller. This difference in potential will preferably come from a current generator, which makes it possible to obtain an impedance only determined by the surface of the electrodes 106, independently of the distances between them. Alternatively, a galvanic couple can be used by manufacturing one of the electrodes with zinc and the other with copper for example, and by electrically connecting these two electrodes by means of cable 113, or one of the conductors constitute this cable, which is in any case con electrotractor to be able to supply the organs contained in the fish. Optionally we can then use a modulated resistor inserted in series between these two electrodes, to 3 represent the alternative phenomena associated with the rotation of the propeller. By way of example, the current flowing through these electrodes will have an intensity of 5 amperes, the equivalent resistance of the whole marine environment current being then substantially equal to four Ohms for an inter fish distance equal to 30m. Under these conditions, the transverse magnetic field will have a value of about 100 nT and the horizontal component of the field
electrique une valeur de l'ordre de 3 mV/m. electric a value of the order of 3 mV / m.
A titre de realisation pratique de la boucle decrite plus haut, on indique que lion peut obtenir un moment de l'ordre de 100 000 A.m2 en utilisant 20 conducteurs de section 5 mm2 parcourus par un courant de 50 A sous une tension de 180 V. La puissance dissipee sera alors de l'ordre de 10 As a practical realization of the loop described above, it is indicated that lion can obtain a moment of the order of 100,000 A.m2 using 20 conductors of section 5 mm2 traversed by a current of 50 A under a voltage of 180 V. The power dissipated will then be of the order of 10
kW, ce qui est tout a fait raisonnable. kW, which is quite reasonable.
Claims (7)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0207029A FR2840583B1 (en) | 2002-06-07 | 2002-06-07 | MULTI INFLUENCE DREDGING SYSTEM |
| DE60323563T DE60323563D1 (en) | 2002-06-07 | 2003-06-04 | Mine clearance system with various influences |
| EP20030101623 EP1369348B1 (en) | 2002-06-07 | 2003-06-04 | Mine sweeping system with different influences |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0207029A FR2840583B1 (en) | 2002-06-07 | 2002-06-07 | MULTI INFLUENCE DREDGING SYSTEM |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2840583A1 true FR2840583A1 (en) | 2003-12-12 |
| FR2840583B1 FR2840583B1 (en) | 2004-07-23 |
Family
ID=29433346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0207029A Expired - Fee Related FR2840583B1 (en) | 2002-06-07 | 2002-06-07 | MULTI INFLUENCE DREDGING SYSTEM |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1369348B1 (en) |
| DE (1) | DE60323563D1 (en) |
| FR (1) | FR2840583B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB579151A (en) * | 1940-01-11 | 1946-07-25 | Francis Richard Walter Preston | Improvements relating to the destruction of mines at sea |
| DE942490C (en) * | 1952-10-19 | 1956-05-03 | Pleuger & Co | Self-propelled otters |
| US2937611A (en) * | 1944-06-10 | 1960-05-24 | Schaelchlin Walter | Control systems |
| DE4119879A1 (en) * | 1991-06-17 | 1992-12-24 | Blohm Voss Ag | Towed marine mine sweeper - consists of steel tubes, with generators for pressure-under pressure fields, and noise generators |
-
2002
- 2002-06-07 FR FR0207029A patent/FR2840583B1/en not_active Expired - Fee Related
-
2003
- 2003-06-04 DE DE60323563T patent/DE60323563D1/en not_active Expired - Lifetime
- 2003-06-04 EP EP20030101623 patent/EP1369348B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB579151A (en) * | 1940-01-11 | 1946-07-25 | Francis Richard Walter Preston | Improvements relating to the destruction of mines at sea |
| US2937611A (en) * | 1944-06-10 | 1960-05-24 | Schaelchlin Walter | Control systems |
| DE942490C (en) * | 1952-10-19 | 1956-05-03 | Pleuger & Co | Self-propelled otters |
| DE4119879A1 (en) * | 1991-06-17 | 1992-12-24 | Blohm Voss Ag | Towed marine mine sweeper - consists of steel tubes, with generators for pressure-under pressure fields, and noise generators |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1369348A1 (en) | 2003-12-10 |
| DE60323563D1 (en) | 2008-10-30 |
| FR2840583B1 (en) | 2004-07-23 |
| EP1369348B1 (en) | 2008-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20170184749A1 (en) | Method and System of a Controllable Tail Buoy | |
| FR2977680B1 (en) | TOWING METHODS AND SYSTEMS FOR GEOPHYSICAL RESEARCH | |
| EP1870733A2 (en) | Assembly for forming a container for transporting and/or handling batteries of seismic sources comprising a base structure and removable uprights, and method of using same | |
| US3802109A (en) | Fish harvester means | |
| FR2840583A1 (en) | MULTI INFLUENCE DREDGING SYSTEM | |
| NO343896B1 (en) | Trawling arrangement | |
| JP2004528220A (en) | Open loop minesweeping system | |
| EP0338901A1 (en) | Magnetic minesweeping system | |
| US20230348031A1 (en) | A traction device for towing an object along a water surface or through a body of water | |
| EP0834172A1 (en) | Towed acoustic transmitter | |
| EP0012098A1 (en) | Ship of the catamaran type with a central stem | |
| CA3020955A1 (en) | Catamaran hull of hybrid structure and craft using such a hull | |
| EP0863833B1 (en) | Device for handling an assembly towed by a naval vessel | |
| EP0631470B1 (en) | Trawl boards | |
| FI112852B (en) | minesweeping | |
| EP0289692A1 (en) | Mine-sweeping device | |
| FR2807999A1 (en) | Arrangement to vary the drag on a sailboat, has two half-keels with ballast, both of which can be moved just like the wings of a butterfly by a strap mounted on their rotation drum | |
| BE501529A (en) | ||
| US1181339A (en) | Mine and submarine destroyer. | |
| BE348125A (en) | ||
| FR3014078A1 (en) | CARENAGE PIECE, CARENAGE STRING, HYDRODYNAMIC COATING, HYDRODYNAMIC ASSEMBLY, ASSEMBLY METHOD THEREFOR | |
| FR2667290A1 (en) | Method for rapidly penetrating through the air or through the water, in the form of an axe or lance cutting edge | |
| WO2000044616A1 (en) | Cycloid thrusters having blades whose shape and orientation are elastically modified by hydrodynamic thrusts | |
| WO2023105068A1 (en) | Underwater vehicle having an elongate body and comprising a stern provided with at least one steering device | |
| DE4119879A1 (en) | Towed marine mine sweeper - consists of steel tubes, with generators for pressure-under pressure fields, and noise generators |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |
Effective date: 20110228 |