WO2006011807A1 - Procede et appareil de surveillance de position - Google Patents

Procede et appareil de surveillance de position Download PDF

Info

Publication number
WO2006011807A1
WO2006011807A1 PCT/NO2005/000279 NO2005000279W WO2006011807A1 WO 2006011807 A1 WO2006011807 A1 WO 2006011807A1 NO 2005000279 W NO2005000279 W NO 2005000279W WO 2006011807 A1 WO2006011807 A1 WO 2006011807A1
Authority
WO
WIPO (PCT)
Prior art keywords
angle
position indication
plate gear
plate
plates
Prior art date
Application number
PCT/NO2005/000279
Other languages
English (en)
Inventor
Henning Skjold-Larsen
Original Assignee
Henning Skjold-Larsen
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 Henning Skjold-Larsen filed Critical Henning Skjold-Larsen
Priority to GB0703768A priority Critical patent/GB2431084B/en
Priority to CA002575434A priority patent/CA2575434A1/fr
Publication of WO2006011807A1 publication Critical patent/WO2006011807A1/fr
Priority to IS8605A priority patent/IS8605A/is

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A01K73/04—Devices for spreading or positioning, e.g. control thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A01K73/025—Regulation of net depth

Definitions

  • the present invention relates to a method and an apparatus for monitoring the position of plate gear for fishing gear.
  • the invention is a further development of the method and apparatus described in NO 20040464, the content of which is hereby incorporated in its entirety in the present application.
  • the object of such monitoring is to enable the position of the fishing gear in the water to be charted in an optimal manner.
  • bottom trawls for example, it is desirable to have bottom contact for most of the time in order to ensure that fish swimming close to the bottom are caught, or to establish a dust cloud near the bottom which scares the fish into the gear.
  • bottom contact sensors are used to establish whether the trawl is moving along the bottom or not.
  • a bottom contact sensor is a tubular body fastened to the trawl at one end with the other end hanging freely.
  • the bottom contact sensor will indicate "bottom contact” / "no bottom contact” depending on the angle between the longitudinal direction of the tubular body and the horizontal direction.
  • the longitudinal direction of the tubular body will form a larger angle with the horizontal than when there is bottom contact.
  • the bottom contact sensor will not be capable of providing reliable information.
  • Measurement of the angular position of a part of a trawl is known from, for example, GB 1 221 276, relating to an apparatus with a measuring unit for measuring two angles for the said part.
  • the publication discloses spherical elements attached to the lower part of the trawl.
  • Large fishing gear such as trawls comprises modules which ensure that a certain position of the trawl is maintained during the fishing process.
  • a module is so-called plate gear, one of whose functions is to ensure that the trawl moves along the bottom with the trawl in an open position.
  • the plate gear is an apparatus with several plates attached to one another by means of wire, rope and/or other attachment devices.
  • the term plate in the present description refers to relatively flat bodies. Each plate normally has four attachment points, where the plates together with the attachment devices form a flexible device.
  • the apparatus in turn is attached to the lower part of the trawl at individual points. During trawling the apparatus will be bent with the result that some plates will remain located in a plane substantially perpendicular to the trawl's towing direction (the middle part of the apparatus) while others will be in a plane substantially parallel to the trawl's direction of travel (the sides of the apparatus).
  • the plates mounted in the middle part of the trawl can assume a tilted position relative to the vertical plane. If the plates tilt forwards (i.e. in the direction towards the boat) the plate gear will partly lose contact with the bottom. The fish will therefore be able to swim under and out of the trawl. If the plates tilt backwards, they will dig down into the bottom, resulting in an undesirable accumulation of material in the trawl.
  • the angular position of the plates can be described by means of three angles: a) Orientation angle: this is the angle that the plates' plane forms with the trawl's direction of travel. As mentioned earlier, with regard to the plates in the middle of the apparatus, the plates' plane will form an angle of around 90 degrees with the trawler's direction of travel, while the plates on the sides will form an angle of around 0 degrees. b) Angle of tilt: this is the angle that the plates' plane forms with a horizontal plane. This angle must be as close to 90 degrees as possible in order for the plate gear to function as efficiently as possible.
  • the plates' angular position will vary depending on the plates' position along the apparatus. For the plates on the side portions of the apparatus it will be more important to measure the angle of pitch than the angle of tilt, while the angle of pitch will not be important for the plates in the middle of the apparatus (the angle of tilt will be the important one in this case).
  • the choice of plate/group for measurement can be undertaken on the basis of the plate's/group's fixed position in the plate gear, i.e. whether the plate is located in the middle of the plate gear, on the sides or in an area between these positions. It will also be possible to select plate/group on the basis of the plate's/group's orientation angle, since it will be possible to measure the relevant angle for a plate and/or a group with the orientation angle located within a specific range of values. The orientation angle can also be measured for a single plate and the same value assigned to other plates in the same group, in order thereby to provide a position indication of the whole plate gear based on only a few measurements.
  • the method according to the invention comprises taking measurements of at least one angle for at least a part of the plate gear and providing a position indication for the plate gear based on the measurement.
  • the plate gear comprises several plates and the measurement is carried out for individual plates and/or for groups of plates.
  • the groups can be defined on the basis of the position of the plates in the plate gear and/or on the basis of the orientation angle. In the latter case, values for the orientation angle will be defined that provide limits for the groups.
  • the method according to the invention therefore comprises:
  • the method comprises measuring the angle of tilt or the angle of pitch depending on the plates'/group's position in the plate gear or the plates'/group's orientation angle.
  • the first alternative will lead to a measurement which, for example, is based on the plate gear being in a symmetrical position relative to the vessel's direction of travel, while the second alternative opens up the possibility that the most appropriate plate/group for measurement varies during the trawling operation.
  • the position indication could consist of individual angular values provided by the measurement. Such a position indication will show whether the plates are tilting towards/away from the vessel and will be able to be used for controlling the plate gear's position.
  • the position indication may also comprise an indication of the "bottom contact/no bottom contact” type, or a graphic presentation showing the angular variation and/or position relative to the bottom in time.
  • the measurement may comprise measuring the angle of tilt, the orientation angle and/or the angle of pitch. Where the angle of tilt and orientation angle are measured, the method may comprise providing position indication based on the values of the orientation angle and the angle of tilt.
  • the angular measurement is preferably performed by means of an inclinometer.
  • the method will advantageously comprise display of the position indication, where this comprises the value of at least one angle. It is possible, of course, to provide the position indication and not display it directly, but to give a message as to whether a threshold is exceeded or not, or to employ the position indication for controlling the plate gear with or without display.
  • the control will comprise regulation of the tightening on the wires connected to the plate gear.
  • the method may comprise comparing the value of at least one angle with a first threshold value and providing position indication based on the result of the comparison.
  • the position indication may also be associated with the triggering of an alarm.
  • the method according to the invention comprises calculating average and standard deviation for the measurements, and providing a position indication for the plate gear with regard to the transition bottom contact/no bottom contact based on average/standard deviation for a collection of angular measurements.
  • the position indication in the form of a position indication signal can be transmitted acoustically to a receiver on the surface by means of a cable connection by radio signals or wirelessly or in some other way. It may also be stored in a memory unit on a module in the plate gear or in another location in the vessel.
  • the invention also comprises controlling the plate gear's position based on the indication signal(s) and desired values.
  • the invention also comprises an apparatus for monitoring the position of plate gear for fishing gear, where the plate gear comprises at least one plate, comprising: - a measuring unit for measuring at least one angle for at least a part of the plate gear, the said part of the plate gear comprising a single plate and/or at least a group of plates,
  • a processing unit for providing, based on the measured value, a position indication for the plate gear
  • the invention will permit the position of the different plates in the plate gear to be controlled, thereby initiating measures for obtaining a fishing operation that is as efficient as possible. Any errors will be able to be detected and remedied quickly by means of the invention.
  • Fig. 1 is a front view of a plate gear.
  • Fig. 2 illustrates a plate gear viewed from above.
  • Fig 3 is a view like that in fig. 2, illustrating the angles for the plate gear.
  • Fig. 4 illustrates a plate viewed from in front and from the side.
  • Fig. 5 illustrates an inclinometer 50 placed on a plate 2.
  • Fig. 6 illustrates an embodiment of an apparatus according to the invention.
  • Fig. 7 illustrates an embodiment of a plate gear.
  • Fig. 8 illustrates a plate gear in use.
  • Fig. 9 is a screen image illustrating a position indication provided by means of the invention for fishing gear during use.
  • Fig. 10 is a screen image similar to that in fig. 9, during lowering of the fishing gear.
  • Fig. 1 is a front view of a plate gear.
  • the plate gear 1 comprises several plates 2 attached to one another by means of attachment devices 4 (wires, ropes, etc.). Each plate has several attachment points 3 against the attachment devices 4.
  • the figure also illustrates an attachment point 6 for attaching the apparatus 1 to the lower part of the trawl by means of a rope 5.
  • Fig. 2 illustrates a plate gear viewed from above.
  • the trawl has reference numeral 20 and a part of the bottom gear reference numeral 1 1.
  • B indicates the vessel's direction of travel.
  • the plate gear 1 will be bent during trawling and some plates 2 remain located in a plane substantially perpendicular to the direction of travel while others are located in a plane substantially comprising the direction of travel.
  • the orientation angle is the angle that the plates' 2 plane forms with the direction of travel.
  • the figure illustrates orientation angles ⁇ 30 and ⁇ 31 for two plates. It can be seen that the nearer the middle of the plate gear 2 a plate is located, the smaller the orientation angle ⁇ will be.
  • Figure 4 illustrates angle of pitch ⁇ and the angle of tilt ⁇ for an individual plate 2. The directions towards the surface and towards the bottom are illustrated by the arrows 42 and 43 respectively.
  • Figure 4a illustrates the plate 2 viewed from in front, and the edges 40 and 41 which will define the angle of pitch with the horizontal.
  • Figure 4b illustrates the angle of pitch ⁇ .
  • Figure 4c illustrates the direction of travel B and angle of tilt ⁇ . Positive angles are defined as angles where the plate's upper edge 40 approaches the trawl as illustrated in the figure.
  • Fig. 5 illustrates an inclinometer 50 placed on a plate 2. As mentioned earlier, this may involve an inclinometer with one, two or three axes, permitting measurement of the angles of orientation, tilt and pitch respectively.
  • FIG. 6 illustrates an embodiment of an apparatus according to the invention.
  • This comprises a measuring unit 50 (advantageously an inclinometer) that measures one or more angles for at least a part of the plate gear 2.
  • the angles are orientation angle O, angle of tilt V and angle of pitch S. Even though the figure only shows one measuring unit 50, it will be obvious that as many measuring units may be employed as there are plates 2.
  • the measurements are transmitted to a processing unit 60, which can either handle the measurements for all the plates or include individual processing units for each plate connected to a central processing unit.
  • a position indication is provided with regard to bottom contact.
  • a position indication will be able to be provided for each individual plate, for groups of plates or for the whole plate gear as a single element.
  • the apparatus may comprise a display unit 62 for displaying the position indication, and/or an alarm 64 which is triggered when a specific threshold is exceeded.
  • the apparatus may also include a transmitter unit 65 for transmitting the position indication to a receiver 66.
  • the apparatus may also include a memory 67 for storing the position indication.
  • the apparatus may comprise a control unit connected to the processing unit for controlling the plate gear's position based on the position indication and desired values.
  • Figure 7 illustrates an embodiment of a plate gear 1.
  • the reference numerals refer to parts corresponding to the description of figure 1.
  • Reference numeral 70 refers to a load, here in the form of a chain, for increasing the weight of the plates.
  • Figure 8 shows a plate gear in use.
  • Figure 9 shows a screen image with an indication of different parameters associated with a trawling operation.
  • the fields on the image will be described from the top and downwards and from left to right.
  • a first field DP illustrates the depth of the trawl in metres (130m)
  • two TSP fields illustrate the trawl's speed and also the angle between water flow and the trawl's direction of travel.
  • the DST field shows distance between the doors.
  • the following TLT fields show angular values, where the last field, TLT with value R -91, illustrates the orientation angle for the middle plate in a plate gear. This angle is 91 degrees and the plates' lower edge is located closer to the towing vessel than the plates' upper edge.
  • the figure 0 shows standard deviation for the angle.
  • the field at the bottom right shows amongst other things the distance between the trawl's lower edge and the bottom, C: 0.1m.
  • Figure 10 illustrates a similar screen image but indicating different parameters obtained while the fishing gear is being lowered. It can be seen that the orientation angle TLT is -1 1 degrees with a standard deviation of 2. The distance C between the trawl's lower edge and the bottom is 5.4m. Even though the invention is illustrated by means of an example where the plates comprise four attachment points, it is possible to measure the angular position of plates that are attached in another way, i.e. with more or less than four attachment points. It is also possible to provide a position indication for only one plate, for example the plate in the middle, and to employ the said position indication for controlling the tightening of the attachment devices.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Gear Transmission (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

Selon l'invention, un procédé de surveillance de la position d'une transmission de plaque (30, 31) pour engin de pêche consiste à mesurer au moins un angle (ALPHA 30, ALPHA 31) pour au moins une partie de la transmission et, en fonction de cette mesure, à fournir une indication de position pour ladite transmission, par rapport à un contact inférieur. Cette invention a aussi pour objet un appareil de réalisation de ce procédé.
PCT/NO2005/000279 2004-07-29 2005-07-27 Procede et appareil de surveillance de position WO2006011807A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB0703768A GB2431084B (en) 2004-07-29 2005-07-27 Method and apparatus for position monitoring
CA002575434A CA2575434A1 (fr) 2004-07-29 2005-07-27 Procede et appareil de surveillance de position
IS8605A IS8605A (is) 2004-07-29 2007-02-08 Aðferð og tæki til að fylgjast með staðsetningu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20043222A NO321070B1 (no) 2004-07-29 2004-07-29 Fremgangsmate og anordning for overvaking av posisjonen til et plategear
NO20043222 2004-07-29

Publications (1)

Publication Number Publication Date
WO2006011807A1 true WO2006011807A1 (fr) 2006-02-02

Family

ID=35013331

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2005/000279 WO2006011807A1 (fr) 2004-07-29 2005-07-27 Procede et appareil de surveillance de position

Country Status (5)

Country Link
CA (1) CA2575434A1 (fr)
GB (1) GB2431084B (fr)
IS (1) IS8605A (fr)
NO (1) NO321070B1 (fr)
WO (1) WO2006011807A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013042076A3 (fr) * 2011-09-22 2014-05-08 Scantrawl As Système et procédé de contrôle et d'affichage de paramètres pendant le chalutage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1221276A (en) 1968-10-23 1971-02-03 Krupp Gmbh Apparatus for determining the position of a trawl net
GB1336897A (en) * 1970-05-27 1973-11-14 Morski Instytut Rybachi Instrument for measuring and recording the trawling line direction in relation to the otter board plane
GB1349082A (en) * 1970-03-06 1974-03-27 Morski Inst Rybacki Device for measurement of the inclination of an element from the vertical
GB2122562A (en) * 1982-06-28 1984-01-18 Seismograph Service Improved pelagic trawl door or paravane
WO1989010054A1 (fr) * 1988-04-28 1989-11-02 Preben Munk Andersen Appareil de surveillance de la position angulaire mutuelle de deux cables, de preference pour la surveillance de chaluts
US5376933A (en) * 1992-01-30 1994-12-27 Tupper; Christopher N. Trawl cable vibration meter
WO2005072520A1 (fr) 2004-02-02 2005-08-11 Henning Skjold-Larsen Surveillance de la position par rapport a un contact au sol

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO326638B1 (no) * 2004-02-18 2009-01-26 Henning Skjold-Larsen Sensormoduler for fiskeredskaper.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1221276A (en) 1968-10-23 1971-02-03 Krupp Gmbh Apparatus for determining the position of a trawl net
GB1349082A (en) * 1970-03-06 1974-03-27 Morski Inst Rybacki Device for measurement of the inclination of an element from the vertical
GB1336897A (en) * 1970-05-27 1973-11-14 Morski Instytut Rybachi Instrument for measuring and recording the trawling line direction in relation to the otter board plane
GB2122562A (en) * 1982-06-28 1984-01-18 Seismograph Service Improved pelagic trawl door or paravane
WO1989010054A1 (fr) * 1988-04-28 1989-11-02 Preben Munk Andersen Appareil de surveillance de la position angulaire mutuelle de deux cables, de preference pour la surveillance de chaluts
US5376933A (en) * 1992-01-30 1994-12-27 Tupper; Christopher N. Trawl cable vibration meter
WO2005072520A1 (fr) 2004-02-02 2005-08-11 Henning Skjold-Larsen Surveillance de la position par rapport a un contact au sol

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013042076A3 (fr) * 2011-09-22 2014-05-08 Scantrawl As Système et procédé de contrôle et d'affichage de paramètres pendant le chalutage

Also Published As

Publication number Publication date
NO20043222D0 (no) 2004-07-29
CA2575434A1 (fr) 2006-02-02
GB2431084A (en) 2007-04-18
GB2431084B (en) 2010-02-24
IS8605A (is) 2007-02-08
NO321070B1 (no) 2006-03-13
GB0703768D0 (en) 2007-04-04

Similar Documents

Publication Publication Date Title
JP7105292B2 (ja) 自動ケージネット沈下システム
EP0959676B1 (fr) Procede et dispositif de commande d'un chalut
US8181380B2 (en) Electronic fishing device and a related system, method, and use
Somerton et al. The affect of speed through the water on footrope contact of a survey trawl
US6851636B2 (en) Fishing reel
US20090299501A1 (en) Method for controlling an electronic fishing device and related software submersible device and carrier medium
EP1715737B1 (fr) Systeme pour schematiser la position d'un engin de peche avec des modules de detection
WO2006011807A1 (fr) Procede et appareil de surveillance de position
EP2757877B1 (fr) Système et procédé de contrôle et d'affichage de paramètres pendant le chalutage
EP2849560B1 (fr) Indicateur de hauteur de chalut
EP2850450B1 (fr) Géométrie d'un chalut jumeau
JP2000102333A (ja) 潜行板付きトロール網
WO2019017132A1 (fr) Appareil de mesure d'état de croissance et procédé de mesure d'état de croissance
US20090133313A1 (en) Angle-Based Filling Ratio Indicator
CN108510682A (zh) 一种应变式张力围栏报警系统
KR20210025346A (ko) 해상 및 해중에 포설된 어업도구 모니터링 시스템
ES2321897B1 (es) Monitorizacion de posicion con respecto al contacto con el fondo.
JPH06121632A (ja) 投網方位、位置の計測方法及びその計測器
JP2554789B2 (ja) 養殖網の網状態監視装置
GB2333682A (en) Fishing float with adjustable counterweight
JPS5850861Y2 (ja) 漁撈装置
JP2006067831A (ja) 釣り糸の巻き取り制御ユニット及び自動合わせ釣り装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

WWE Wipo information: entry into national phase

Ref document number: 2575434

Country of ref document: CA

ENP Entry into the national phase

Ref document number: 200750006

Country of ref document: ES

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: P200750006

Country of ref document: ES

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 0703768.2

Country of ref document: GB

Ref document number: 0703768

Country of ref document: GB

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 05777433

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 05777433

Country of ref document: EP

Kind code of ref document: A1

WWW Wipo information: withdrawn in national office

Ref document number: 200750006

Country of ref document: ES

Kind code of ref document: A