EP4017796A1 - Device for fastening acoustic transducers to a watercraft - Google Patents
Device for fastening acoustic transducers to a watercraftInfo
- Publication number
- EP4017796A1 EP4017796A1 EP20754235.8A EP20754235A EP4017796A1 EP 4017796 A1 EP4017796 A1 EP 4017796A1 EP 20754235 A EP20754235 A EP 20754235A EP 4017796 A1 EP4017796 A1 EP 4017796A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- traction means
- fastening element
- rope
- sound transducer
- watercraft
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000012209 synthetic fiber Substances 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000005452 bending Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/56—Towing or pushing equipment
- B63B21/66—Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables
Definitions
- the invention relates to a device for attaching sound transducers to a watercraft, a corresponding towing sonic which comprises the device and the associated manufacturing method.
- Towing sonars are a popular means of underwater reconnaissance.
- a towing sonar has a large number of sound transducers, also referred to as hydrophones, which are arranged one behind the other and which are arranged along a pull rope.
- the longer a towing sonar the smaller the blind angle, especially in the case of an underwater vehicle, that is generated by the towing sonar.
- the distance to the watercraft is increased, so that an active towing sonar, which initially emits sound waves in order to receive and evaluate their reflections, is more difficult to assign to the watercraft.
- the resolution of a longer drag sonar is also better than the resolution of a shorter drag sonar. The tendency is therefore to develop longer and longer tow sonars.
- the towing sonar can be connected directly to the towing watercraft by means of the traction device.
- the towing sonar can also be connected to the watercraft indirectly by means of a connecting means which is connected to the traction means, in particular releasably.
- the connecting means can be a pulling cable which is arranged between the pulling means and the watercraft.
- the towing sonar If the towing sonar is not needed for reconnaissance, it can be rolled up on a drum and transported on the watercraft in order to increase the maneuverability of the watercraft and to reduce the risk of the towing sonar getting caught.
- the longer the towing sonar the thicker the pull rope becomes in order to withstand the forces that occur, so that the diameter of the pull rope quickly exceeds the diameter or size of the sound transducer.
- connection elements that connect the pull rope to the watercraft, to the connecting means or also to one another are often even thicker, that is to say have an even larger diameter than the pull rope itself.
- a splice eye (also referred to as an eye splice) is often used as the connection element, which, for example, has to be 10 times the size of the rope diameter in order to maintain the tensile strength of the haul rope through tight bending radii of the pull rope to form the splice eye. Smaller splice eyes would reduce the breaking strength of the pull rope. Such large splice eyes stand in the way of the requirement to develop thin towing sonars.
- a splice eye with a diameter of 50mm would have to be provided for a traction rope with a diameter of 5mm. Towing sonars that require a 5mm diameter cable to absorb the resulting tensile forces cannot therefore have a diameter that is less than 50mm. Otherwise the towing sonar cannot be properly wound onto the drum. However, there is a need to develop corresponding drag sonars with a smaller diameter.
- a thick pull rope also requires a drum with a larger diameter than a thin pull rope so that a predetermined maximum bending radius of the pull rope is maintained. If the bending radius is too small, the fibers of the pull rope will “kink”, so that they break faster and the pull rope can no longer withstand the loads and will break or tear. The maximum service life of the drag sonar is thus reduced. However, there is no space for large drums on the watercraft.
- the object of the present invention is therefore to create an improved concept for towed antennas.
- Exemplary embodiments show a device for attaching sound transducers to a watercraft with a traction device which, in particular free of stress, has a first extension in a first lateral direction (y) and a second extension in a second lateral direction (z), which extends from the first expansion (y) differs.
- the device further comprises a fastening element which is designed to connect a sound transducer to the traction means.
- the traction means has the absence of a round cross section without load (that is, load-free).
- the fastening element is, for example, a tab that is connected to the traction mechanism and can firmly connect a sound transducer to the traction mechanism.
- the fastening element can, for example, be sewn or glued to the traction means at the edges, so that a cavity for the sound transducer remains in the middle between the fastening element and the traction means.
- the fastening element can then be arranged in the tab in order to connect the sound transducer to the traction means.
- a plurality of fastening means can be arranged along the traction means, preferably equidistantly. A large number of sound transducers can thus be arranged along the traction means (in the x direction), for example in order to form a towed antenna.
- the first lateral direction (y) is also referred to as the width of the traction device.
- the second lateral direction (z) is also referred to as the thickness of the traction means.
- a multiplicity of sound transducers can also be arranged on the traction means by means of a corresponding number of fastening elements (that is to say a multiplicity of fastening elements). The number of transducers is mainly limited by the length of the traction device.
- the tension means can be enlarged in its width in order to be able to withstand the necessary forces, while its thickness is kept very thin in order to allow small bending radii, so that the connection element (e.g. the splice eye) can be kept small and that Traction means can be rolled up on a drum or winch with a small diameter.
- a traction means that has the same tractive force as the traction rope can be made thinner than the traction rope, so that a required minimum bending radius for the traction means is smaller than that for the traction rope.
- the drum or winch of the watercraft can then have a smaller diameter than when using a comparable rope as the traction means.
- the first dimension in the first lateral direction (y) is at least two times, in particular at least four times, preferably at least six times as large as the second dimension in the second lateral direction (z).
- a sufficient tensile strength of the traction means is thus achieved even with long towed antennas and the maximum bending radius of the device or of the traction means is kept small at the same time.
- the traction means has a first rope and a second rope, the first rope and the second rope having a common fastening element.
- the fastening element can either be fastened to one of the two cables or, instead of just one cable, the fastening element for the sound transducer can be fastened to two (or a plurality) of cables.
- the ropes can be run parallel to one another, so that the entirety of the ropes that form the traction means has the different expansions in the two lateral directions. Because the force is distributed over several ropes, the individual ropes can have a smaller diameter than a single pull rope.
- a multiplicity of fibers which are combined into a strand, in particular twisted, can be regarded as a rope.
- the fibers of the traction device, in particular of the first and / or the second rope are, for example, natural or synthetic fibers, e.g. aramid fibers, Fligh-Tech fibers, etc.
- the ropes can run separately from one another.
- the first cable is connected to the second cable to form a band in an area between the fastening element and a further fastening element, which is designed to connect a further sound transducer to the traction means.
- Alternative terms for the tape are belts, Belt, belt, hose or sling.
- the ropes can be potted with a potting material, for example a plastic or rubber, in order to form the band.
- the first rope can be woven with the second rope (and optionally any further ones of the plurality of ropes) to form the tape.
- a method for producing a traction means is disclosed with the following steps: forming the traction means which, in particular free of stress, has a first extent in a first lateral direction and has a second extent which differs from the first extent in a second lateral direction; during or after the formation of the traction means, fastening a fastening element to the traction means in order to connect a sound transducer to the traction means.
- a towing sonar with the device and a sound transducer, which is connected to the traction means by means of the fastening element is disclosed.
- the towing sonar can also have a cover which (hermetically) encloses the device and, for example, only allows access to the connection element.
- the casing can be filled with a liquid, for example oil.
- the towing sonar can be connected to the watercraft by means of the connection element and it is also possible to connect a large number of the towing sonars to one another (sequentially), that is to say in a row, in order to obtain an extended towing sonar.
- FIG. 2 a schematic representation of various embodiments of the device, with a top view being shown in FIGS. 2a, 2b, 2c and 2d and a side view being shown in FIG. 2e.
- FIG. 1 shows a schematic perspective illustration of a device 18 for attaching sound transducers to a watercraft.
- the device 18 has a traction means 20 and a fastening element 22.
- the fastening element 22 can connect a sound transducer (not shown) to the traction means.
- the device with the sound transducer is then referred to as a drag sonar.
- the device 18 has a plurality of fastening elements 22, into each of which a sound transducer can be inserted in order to connect the same to the traction means.
- Lugs also referred to as pockets, can be used as the fastening element. These can be arranged on one or both sides of the device.
- the traction means 20 has a first extent in a first lateral direction (y) and a second extent in a second lateral direction (z), which differs from the first extent (y).
- the traction means has a thickness which is less than a width of the traction means.
- a length (z), also referred to as the main direction of extent the device 18 has, for example, a length of more than 20 m, in particular more than 40 m.
- a certain number for example between 5 and 15 of the aforementioned, can be used to form a usable towing sonar with sufficient length
- Devices or drag sonars (for example by means of the connection element) are connected to one another in order to obtain a drag sonar with a length of, for example, between 200 meters and 600 meters.
- lengths of over 600 m are also possible, for example by increasing the length of the individual devices or towing sonars or the number of connected devices or towing sonars.
- Points 30 in all figures indicate that both the length of the traction means 20 and a number of the fastening elements 22 arranged on the traction means 20 can be varied (as desired).
- the 2a shows an exemplary embodiment of the device 18.
- the device 18 has a first cable 24a and a second cable 24b.
- the first rope 24a is arranged at a distance from the second rope 24b.
- the ropes 24a, 24b together form the traction means 20.
- a common fastening element 22 is attached to the ropes.
- FIG. 2b shows an exemplary embodiment of the device 18.
- an area between the fastening element 22 and a further fastening element 22 ′ is connected to form a band 24.
- the band 24 can advantageously extend at least between a foremost (first) and a rearmost (last) of the fastening elements arranged on the traction means or over an entire length of the device.
- the connection of the first rope 24a to the second rope 24b to form the band 24 can be effected by means of casting (for example by means of a plastic or rubber) or by means of gluing.
- the band 24 can also be produced by weaving.
- the first rope 24a and the second rope 24b then form an outer boundary of the fabric.
- the fabric extends from the first rope 24a to the second rope 24b.
- further ropes running parallel to ropes 24a and 24b can run through the fabric.
- FIG. 2c shows a further exemplary embodiment of the device 18.
- the first rope 24a is connected to the second rope 24b (and further Ropes) woven into the band 24. That is, the ropes 24a and 24b are part of the fabric and do not represent the outer boundary of the fabric as shown in FIG. 2b.
- connection element 26 shows a further exemplary embodiment of the device 18. It is shown that the first cable 24a and the second cable 24b are connected to a connection element 26.
- the connection element 26 can be connected directly to a watercraft 28, as shown in FIG. 2d.
- a connecting means can be arranged between the watercraft 28 and the connection element 26 in order to connect the watercraft 28 to the towing sonar.
- a splice eye formed from both ropes can be used as connection element 26, for example.
- the first cable 24a and the second cable 24b can each have their own connection element.
- Fig. 2e shows an embodiment of the device in a side view.
- the traction means 20 is arranged in an (endless) loop.
- the fastening elements 22, 22 ' are arranged between an upper and a lower panel of the loop.
- the traction means runs from the upper track, for example around a last fastening element or any other termination, for example a weight, to the lower track.
- the device can be attached to the watercraft through the loop.
- the disclosed (water) sound transducers are designed for use under water, in particular in the sea.
- the sound transducers are designed to convert water-borne sound into an electrical signal (eg voltage or current) corresponding to the sound pressure, the water-borne sound signal.
- the sound transducers are designed to convert an applied electrical voltage into water-borne sound.
- the sound transducers can accordingly be used as water-borne sound transducers and / or as water-borne sound transmitters.
- the sound transducers have a piezoelectric material, for example a piezoceramic, as the sensor material.
- the transducers can be used for (active and / or passive) sonar (sound navigation and ranging).
- the sound transducers are not suitable for medical applications.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019212652.9A DE102019212652A1 (en) | 2019-08-23 | 2019-08-23 | Device for attaching sound transducers to a watercraft |
PCT/EP2020/072346 WO2021037529A1 (en) | 2019-08-23 | 2020-08-10 | Device for fastening acoustic transducers to a watercraft |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4017796A1 true EP4017796A1 (en) | 2022-06-29 |
Family
ID=72046897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20754235.8A Pending EP4017796A1 (en) | 2019-08-23 | 2020-08-10 | Device for fastening acoustic transducers to a watercraft |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4017796A1 (en) |
DE (1) | DE102019212652A1 (en) |
IL (1) | IL289382A (en) |
WO (1) | WO2021037529A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2729041B1 (en) * | 1994-12-28 | 1997-01-31 | Thomson Csf | ACOUSTIC TRANSMISSION PROCESS FOR SONAR |
FR2925231B1 (en) * | 2007-12-18 | 2009-11-27 | Thales Sa | TRANSMIT SONAR ANTENNA WITH VERTICAL AXIS WINDABLE ON A WINCH |
US8593905B2 (en) * | 2009-03-09 | 2013-11-26 | Ion Geophysical Corporation | Marine seismic surveying in icy or obstructed waters |
-
2019
- 2019-08-23 DE DE102019212652.9A patent/DE102019212652A1/en active Pending
-
2020
- 2020-08-10 EP EP20754235.8A patent/EP4017796A1/en active Pending
- 2020-08-10 WO PCT/EP2020/072346 patent/WO2021037529A1/en unknown
-
2021
- 2021-12-26 IL IL289382A patent/IL289382A/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2021037529A1 (en) | 2021-03-04 |
DE102019212652A1 (en) | 2021-02-25 |
IL289382A (en) | 2022-02-01 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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Effective date: 20220323 |
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RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: THYSSENKRUPP AG Owner name: ATLAS ELEKTRONIK GMBH |
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DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |