EP0480936A1 - Procede et systeme de protection contre la salissure biologique marine d'une carene ou autre edifice immerge. - Google Patents

Procede et systeme de protection contre la salissure biologique marine d'une carene ou autre edifice immerge.

Info

Publication number
EP0480936A1
EP0480936A1 EP90907525A EP90907525A EP0480936A1 EP 0480936 A1 EP0480936 A1 EP 0480936A1 EP 90907525 A EP90907525 A EP 90907525A EP 90907525 A EP90907525 A EP 90907525A EP 0480936 A1 EP0480936 A1 EP 0480936A1
Authority
EP
European Patent Office
Prior art keywords
hull
transducers
water
fouling
generating
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
Application number
EP90907525A
Other languages
German (de)
English (en)
Other versions
EP0480936B1 (fr
Inventor
Lars C O Infraware Tech Ostlie
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.)
INFRAWAVE TECHNOLOGY AS
INFRAWAVE TECH AS
Original Assignee
INFRAWAVE TECHNOLOGY AS
INFRAWAVE TECH AS
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 INFRAWAVE TECHNOLOGY AS, INFRAWAVE TECH AS filed Critical INFRAWAVE TECHNOLOGY AS
Priority to AT90907525T priority Critical patent/ATE101566T1/de
Publication of EP0480936A1 publication Critical patent/EP0480936A1/fr
Application granted granted Critical
Publication of EP0480936B1 publication Critical patent/EP0480936B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B59/00—Hull protection specially adapted for vessels; Cleaning devices specially adapted for vessels
    • B63B59/04—Preventing hull fouling
    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/34—Sound-focusing or directing, e.g. scanning using electrical steering of transducer arrays, e.g. beam steering
    • G10K11/341—Circuits therefor
    • G10K11/346—Circuits therefor using phase variation

Definitions

  • the present invention relates to a method and a system for counteracting marine, i.e. marine biologic, fouling of a ship's hull or some other construction which is submerged in sea water, and more specifically by using mechanical vibrations.
  • marine i.e. marine biologic
  • fouling of a ship's hull or some other construction which is submerged in sea water, and more specifically by using mechanical vibrations.
  • Norwegian patent no. 82676 is used a system of high frequency sound, i.e. "ultrasound", from transducers mounted on the inside of the hull, so that the hull propagates ultrasonic frequencies (the wave lengths in the hull are then shorter than about 25 cm, and in the water just outside the hull shorter than about 7 cm) .
  • nodal lines For example bulkhead walls inside the ship's hull will constitute such fixed nodal lines in the locations where the bulkhead walls are welded to the hull, so that the ship's hull will vibrate only between the bulkhead walls. Thus, along such nodal lines the desired water particle movements will be too small to prevent fouling.
  • nodal lines nodal lines or points in the usual acoustic sense, wherein nodal points (compare “Kundt's tube”) are points with a periodic location in accordanc with the sound wavelength .
  • nodal points compact "Kundt's tube”
  • lines or points on a ship's hull which are mechanically clamped, i.e. fixed from the inside of the hull by constructional details, usually bulkhead walls, and these lines or points therefore cannot undertake transverse oscillations.
  • Fig. 1 shows a section through a ship's hull as well as pressure and velocity vectors in the water outside the hull.
  • Fig. 2 indicates more clearly the drive mode for the hul oscillations as well as the resulting longitudinal water particle movement adjacent to the hull
  • Fig. 3 shows an example of applied electrical drive voltage to the transducers and the corresponding pressure behavior and particle movement behavior in the water,- and
  • Fig. 4 shows an arrangement of transducers on the inside of a ship's hull, in section and normal view.
  • Fig. 1 appears a section through a ship's hull 1 to b put in oscillation by means of electro-mechanical transducers 2, 3.
  • the problem is that the bulkhead wall 4 clamps the hul against transverse oscillations, so that the necessary relati water particle movement between water and hull is not achieve in this area, only in the surrounding areas where said hull i able to oscillate (up and down in the drawing) .
  • Fig. 3 appears an approxima square wave time behavior for the dynamic pressure in the wate which ensures maximum acceleration.
  • a pressure behavior is obtained by applying to the transducers a drive signal of a special type, see the curve shapes in the upper part of Fig. 3
  • a fundamental frequency about 20-30 Hz forms the starting poin for generating a number of harmonics, which harmonics are then added to or superposed upon said fundamental frequency.
  • the coefficients used in this operation are determined from knowledge regarding particular physical characteristics of sai transducers. The resonance frequency and the efficiency are o particular importance. Only odd harmonics are used in the superposing operation.
  • Fig. 4 displays at left the ship's hull 1 in section as viewed along the main axis of the ship.
  • Six transducers are present, of which three are visible and the other three trans ⁇ ducers are hidden right behind the three visible ones.
  • the same configuration is viewed fro the side, and this drawing illustrates how the water particle velocity also achieves a sufficient value in the area along th nodal line 4 between the transducer pairs, by means of a super ⁇ posing effect.
  • further transduc rows outside the indicated nodal lines in the outer edges of the right part of the drawing which transducer rows cooperate in a corresponding manner with the transducer points shown.
  • transducer pairs are excited in inverted phase oscillations , so that "water dipoles" are created therebetween.
  • the phenomenon can also be regarded as a so-called “push-pull” configuration, where the water mass simultaneously is pushed in one end and pulled in the other end. This mode of operation ensures the highest possible efficiency and movement coverage of the nodal line areas.
  • the water movement should preferably have the same spatial size order as the size of the larvae in question; that is the water particles must move with an amplitude of about +/- 0,1-0,2 mm. In the vibrating areas of the hull, this is achieved by exciting oscillatory hull amplitudes of just such a size order, i.e. +/- 0,1-0,2 mm. In order to achieve.the necessary anti-fouling effect in the nodal line areas, it must additionally be taken care that the applied drive voltage to the transducers provide a maximum acceleration in the dipole system, and thereby also the highest possible velocity.
  • the special drive voltage applied to the transducers has a time behavior of a quite particular type.
  • a Fourier technique is used in which odd harmonics are superposed upon the "key note” oscillation in question, and with scaling coefficients for each particular harmonic, which scaling coefficients are determined from a knowledge of different physical parameters for the transducers in question, like resonance frequency, efficiency and similar parameters.
  • inverted phase working transducers are situated in rows on each side of said nodal line, and said transducers are working in pairs against each other in a "push-pull" configuration.
  • the effect is of course attenuated in a lateral direction, but due to the superposing from two adjacent pairs of transducers, there is also achieved a good effect sideways along the nodal line.
  • trans ⁇ ducers cooperate in pairs with transducer rows on each side, i.e. when a transducer row is situated between two parallell nodal lines.
  • the transducers in a pair are located in the same distance from the nodal line, the transducers shall normally oscillate in reverse phase with each other. However, if the distances are somewhat different, or other assymetric conditions are present, a certain additional phase change will be of interest for one of the two transducers in the pair. This phase deviation can be obtained by delaying one of the two inverted phase voltages correspondingly, so that optimum particle velocity conditions are always achieved over the nodal line.
  • the mechanical vibration system can be used advantageously in combination with a coating system which aims to prevent fouling by other types of organisms
  • an anti-fouling layer consisting of a material which has very low surface tension/surface energy in relation to and against water, which lowers the possibility that the organisms in question can get stuck to the hull by adhesion.
  • the material is of a type which successively dissolves in sea water, and thereby removes organisms which are about to be deposited on the hull.
  • Possible layers for this type of completing effect consist of a material of organic type, preferably comprising therein silicon, fluorine, nitrogen or oxygen, possibly one or more of said substances in combination.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Catching Or Destruction (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Processing Of Solid Wastes (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

Un système et un procédé de protection contre la salissure marine p. ex. de la carène d'un navire (1), selon lesquels des transducteurs électromécaniques à vibrations à basse fréquence (2, 3) sont placés en paires autour de lignes nodales (4) fixées ("cramponnées") de la carène (1), et lesdits transducteurs (2, 3) sont entraînés dans une relation de phase opposée afin de communiquer aux particules d'eau un mouvement qui est parallèle à la carène (1) immédiatement en dehors desdites lignes nodales (4), en plus des mouvements relatifs de particules d'eau juste en dehors des transducteurs (2, 3), lesquels mouvements sont sensiblement perpendiculaires à la carène. Cette invention comporte également une combinaison du système mécanique précité et d'une couche de surface spéciale qui pare à la salissure par d'autres organismes que ceux qui sont affectés par le mouvement des particules d'eau dans la gamme des infra-fréquences.
EP90907525A 1989-05-12 1990-05-14 Procede et systeme de protection contre la salissure biologique marine d'une carene ou autre edifice immerge Expired - Lifetime EP0480936B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90907525T ATE101566T1 (de) 1989-05-12 1990-05-14 Verfahren und vorrichtung zum schuetzen eines schiffskoerpers oder unterwasserbauwerks gegen biologische verschmutzung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO891932A NO170320C (no) 1989-05-12 1989-05-12 Fremgangsmaate og system for motvirking av marinbiologisk begroing paa skipsskrog eller andre neddykkede konstruksjoner
NO891932 1989-05-12

Publications (2)

Publication Number Publication Date
EP0480936A1 true EP0480936A1 (fr) 1992-04-22
EP0480936B1 EP0480936B1 (fr) 1994-02-16

Family

ID=19892014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90907525A Expired - Lifetime EP0480936B1 (fr) 1989-05-12 1990-05-14 Procede et systeme de protection contre la salissure biologique marine d'une carene ou autre edifice immerge

Country Status (10)

Country Link
EP (1) EP0480936B1 (fr)
JP (1) JPH05503477A (fr)
KR (1) KR920700993A (fr)
AU (1) AU642418B2 (fr)
CA (1) CA2057050A1 (fr)
DE (1) DE69006736T2 (fr)
ES (1) ES2050440T3 (fr)
FI (1) FI915300A0 (fr)
NO (1) NO170320C (fr)
WO (1) WO1990013474A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06227487A (ja) * 1993-01-11 1994-08-16 Clean Marine Ltd 音波式船底防汚装置及び低周波音波発振器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI103190B (fi) * 1994-11-01 1999-05-14 Savcor Process Oy Menetelmä eliöstön kasvun estämiseksi nesteupotuksessa olevien rakente iden pinnoilla
NO304506B1 (no) * 1997-02-28 1999-01-04 Lars S Istlie FremgangsmÕte og anordning for Õ forhindre avsetning av begroingslarver pÕ skipsskrog
CA2948991A1 (fr) * 2016-11-18 2018-05-18 Emcs Industries Ltd. Systeme anti-encrassement marin hydrosonore
TWI699548B (zh) * 2019-05-17 2020-07-21 國立高雄科技大學 海事設備抑制海洋生物系統
CN112657818A (zh) * 2020-12-29 2021-04-16 上海磊华船舶工程有限公司 一种用于平面薄壁结构的膜状换能器、装置和系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990381A (en) * 1971-01-14 1976-11-09 National Patent Development Corporation Hydrophilic polymer coating for underwater structures
US4058075A (en) * 1975-03-21 1977-11-15 Ralph M. Guito, Jr. Marine life growth inhibitor device
FR2415572A1 (fr) * 1978-01-25 1979-08-24 Sarti Sanchez Rosario Emetteur d'ultrasons antiparasites pour coques de bateaux
GB2040314B (en) * 1978-12-20 1983-04-13 Soyuz Z Kotloochistka G Protecting objects immersed in aqueous medium against fouling with microorganisms
FR2603016B1 (fr) * 1986-08-25 1988-11-10 Treboz Michel Dispositif tres basse frequence pour l'inhibition de la souillure des coques de navires par les mollusques marins

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9013474A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06227487A (ja) * 1993-01-11 1994-08-16 Clean Marine Ltd 音波式船底防汚装置及び低周波音波発振器

Also Published As

Publication number Publication date
AU642418B2 (en) 1993-10-21
DE69006736D1 (de) 1994-03-24
ES2050440T3 (es) 1994-05-16
NO170320B (no) 1992-06-29
NO891932L (no) 1990-11-13
FI915300A7 (fi) 1991-11-11
FI915300A0 (fi) 1991-11-11
CA2057050A1 (fr) 1990-11-13
WO1990013474A1 (fr) 1990-11-15
JPH05503477A (ja) 1993-06-10
NO170320C (no) 1992-10-07
DE69006736T2 (de) 1994-06-01
EP0480936B1 (fr) 1994-02-16
AU5656290A (en) 1990-11-29
NO891932D0 (no) 1989-05-12
KR920700993A (ko) 1992-08-10

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