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WO2006045161A1 - Systeme antisalissure marin utilisant des ultrasons - Google Patents

Systeme antisalissure marin utilisant des ultrasons Download PDF

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Publication number
WO2006045161A1
WO2006045161A1 PCT/AU2005/001676 AU2005001676W WO2006045161A1 WO 2006045161 A1 WO2006045161 A1 WO 2006045161A1 AU 2005001676 W AU2005001676 W AU 2005001676W WO 2006045161 A1 WO2006045161 A1 WO 2006045161A1
Authority
WO
WIPO (PCT)
Prior art keywords
marine
transducer
rod
fouling system
aerials
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.)
Ceased
Application number
PCT/AU2005/001676
Other languages
English (en)
Inventor
Gary Arthur Stutt
Philip Henry Jones
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.)
WATERTECH HOLDINGS Ltd
Original Assignee
WATERTECH HOLDINGS Ltd
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
Priority claimed from AU2004906233A external-priority patent/AU2004906233A0/en
Application filed by WATERTECH HOLDINGS Ltd filed Critical WATERTECH HOLDINGS Ltd
Publication of WO2006045161A1 publication Critical patent/WO2006045161A1/fr
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • the present invention relates to anti-fouling systems and particularly those used to prevent scale and biological buildup on marine vessels or underwater structures.
  • Ultrasonics have been used in the past to clean surfaces, remove existing scale, prevent scale formation and to prevent biological build-up or animal growth by helping to break down the protective shell of most common parasitic organisms. These organisms typically include barnacles, mussels, marine worms, corals, anemones, sponges and algae which attach themselves to any exposed surface of boats, ships, docks and other submerged or partially submerged structures. When these organisms attach themselves to the hulls of ships or boats, their presence hastens the breakdown of the outer finish of the hull as well as detracting from the performance of the affected vessel. Ultrasonic transducers convert electrical energy into vibrational mechanical energy, often sound or ultrasound, that is used to perform the cleaning task.
  • Ultrasonic cleaning is a result of sound waves introduced into water flowing through a conduit or pipe by means of a series of coils wrapped around a pipe. The sound travels through the pipe carrying the water and creates waves of compression and expansion in the liquid. Ih the compression wave, the molecules of the fluid are compressed together tightly. Conversely, in the expansion wave, the molecules are forced apart, creating microscopic bubbles. The bubbles only exist for a split second and contain a partial vacuum while they exist.
  • wire mesh is embedded in the fibreglass
  • This wire mesh conducts a sonic signal from the generator to the hull exterior which has metallic plates interspersed on its exterior surface.
  • the sonic signal emanates from each of the metallic plates to provide a plurality of sonic emitters.
  • transducers In order to provide the necessary field of vibration, the transducers must be arranged on the inside of the hull in pairs. These pairs of transducers must be spaced on either side of a nodal line at a pre-determined distance.
  • the present invention is directed to a marine anti-fouling system, which may at least partially overcome the abovementioned disadvantages or provide the consumer with a useful or commercial choice.
  • the invention resides in a marine anti-fouling system for a marine surface, the system including at least one ultrasonic generation means and at least one ultrasonic transmission means, the system including a transducer with at least partially magnetic operation, the transducer having a polar axis, the transducer attached with the polar axis parallel to the surface.
  • the system finds application where a surface is the subject of scale formation or biological build-up or animal growth by helping to break down the protective shell of most common parasitic organisms.
  • These organisms typically include barnacles, mussels, marine worms, corals, anemones, sponges and algae, which attach themselves to any exposed surface of boats, ships, docks and other submerged or partially submerged structures.
  • the system is particularly well adapted to treat boat hulls, pier footings and any underwater structure or surface.
  • the ultrasonic generation means may comprise a power supply connected to a power source.
  • the power supply is preferably linked to the transducer via supply cables.
  • the transducer will typically be a magnetostrictive transducer.
  • the system may further comprise a transducer having at least one and typically two aerials.
  • Each of the aerials may take the form of elongate members or wires.
  • the aerials may preferably be wires approximately 2.5 mm in diameter.
  • the transducer may suitably include a rod of magnetostrictive material, preferably wood, about which the aerials may be wound.
  • the rod may take any shape and be of any length although it will typically be approximately 20 to 80 cm in length and approximately 5 cm in diameter.
  • the rod will suitably be held in position using a support structure.
  • the support structure may include a base plate and at least one, but preferably a pair of upstanding arm members extending approximately perpendicular from the base plate. All portions of the support structure may suitably be manufactured from a conductive material in order to transmit the sound waves from the transducer to the surface effectively.
  • the support structure will be manufactured from wood. Other materials may be used, and the material used may be chosen depending upon the surface to be anti-fouled. Where wood is used, typically the more dense the wood, the better.
  • the ends of the rod may engage the upstanding arm members of the support structure in a mortise and tenon attachment.
  • the rod may be removable from the arms but preferably will be securely attached thereto.
  • the base plate will typically be securely fastened relative to the surface to be treated. This fastening may typically be such that the rod with the attendant aerials will extend in a configuration which is parallel to the surface to be treated. For instance, when treating a boat hull, the transducer may be fitted beneath the floor of the boat adjacent the keel of the boat.
  • the aerials may each preferably form a coil.
  • Each coil when electrified, preferably produces an alternating magnetic field which in turn induces mechanical vibrations at an ultrasonic frequency in resonant magnetostrictive material which is attached relative to the surface to be vibrated.
  • the aerials are suitably wrapped about the rod.
  • the two aerials may be wound about the rod starting from the same point on the rod. Generally a minimum of seven revolutions may be required for the ultrasonic means to function optimally. It is preferred that each of the aerials revolve in opposed directions about the rod, one in a clockwise direction and one in a counter-clockwise direction.
  • the coils will typically be separated from one another and the distance between each coil may suitably be approximately 75 mm.
  • the aerials are typically separable from the supply cables. Any means of attachment of the aerials to the cables may be used and typically the attachment means will allow transmission of an electrical and/or an ultrasonic signal to the transducer.
  • the polar axis of the coils will be coaxial.
  • the current applied to each of the coils may differ in such aspects as the level of current, the direction in which the current is applied thus changing the direction of the polar axis when the charge is applied to the coils and the frequencies of each of the coils maybe offset.
  • the power supply preferably creates a modulating ultrasonic field around the aerials, the field ranging in frequency from 50 to 80000 hertz.
  • the power supply supplies a signal at a variable frequency (or sweeping frequency) to each of the aerials.
  • the signal frequency starts at approximately 15 kilohertz and increases by 2 kilohertz over each two minute period. When a frequency of 71 kilohertz is reached, the frequency drops to 15 kilohertz and repeats the above process.
  • magnetostrictive systems have not moved to a sweep frequency system.
  • the magnetostrictive transducer generally has such a large inertial mass that it is difficult to shift the frequency as rapidly as is required to get good sweep frequency. By sweeping the frequency at two minute intervals, this problem is at least partially overcome.
  • the use of deliberate frequency sweeping and multiple frequencies may avoid localized hot spots in the fluid surrounding or adjacent the surface to be treated which are generally caused from standing wave formation.
  • the ultrasonic frequency generated by the transducer is typically dependent on the length of the transducer with higher frequency requiring a shorter length.
  • the use of a pair of coils may also assist with the production of standing wave formation
  • the ultrasonic frequency impacts the diameter of the cavitation event.
  • Low frequencies generally result in large diameter cavitations and higher frequencies result in small diameter cavitations.
  • the energy per cavitation follows the same trend.
  • the number of cavitations per unit volume is high with high frequency systems and low with low frequency systems.
  • the combination of energy per cavitation and number of cavitations is total energy and this is approximately equal for most frequencies.
  • a graphical representation of the relationship between frequency and number and energy of the cavitation is illustrated in Figure 1. By inducing a frequency sweep between 15 kHz and 71 kHz, the surface to be treated may be subjected to both large diameter cavitations and small diameter cavitations as well as higher and lower energy cavitations.
  • Control means may also be provided for the system. It is preferred that the operation of the system, including its start and finish time (if any), be controlled by the system control means.
  • the control means may initiate a cleaning cycle, time the cycle, and shut down the system at the completion of the cleaning cycle.
  • the system may operate continuously.
  • One or more timers may also be provided.
  • the polar axis of the transducer is oriented perpendicular to the surface to be treated.
  • the polar axis of the transducer is oriented substantially parallel with the surface to be treated.
  • Figure 1 illustrates a graphical representation of the relationship between ultrasonic frequency and the number and energy of the cavitations.
  • Figure 2 is a top view of a transducer according to a preferred embodiment of the present invention.
  • Figure 3 is a perspective view of the transducer illustrated in Figure 2.
  • Figure 4 is a schematic representation of a prior art magnetostrictive transducer.
  • a marine anti-fouling system is provided.
  • the system is used to treat a marine surface 11, generally a submerged surface.
  • the system includes an ultrasonic generation means and a magnetostrictive transducer 10 having a polar axis.
  • the transducer 10 is attached relative to the surface to be treated 11 with its polar axis parallel to the surface.
  • the transducer 10 is attached on the interior of the boat hull as seen in Figures 2 and 3.
  • the ultrasonic generation means may comprise a power supply connected to power source.
  • the power supply is linked to the transducer 10 via supply cables 12.
  • the system includes a transducer 10 having two aerials 13.
  • Each of the aerials of the preferred embodiment is in the form of elongate members or wires.
  • the aerials are approximately 2.5 mm in diameter.
  • the transducer 10 includes a rod 14 of magnetostrictive material, usually wood, about which the aerials 13 are wound.
  • the rod 14 illustrated in figures 2 and 3 is approximately 50 cm in length and approximately 5 cm in diameter.
  • the rod 14 is held in position using a support structure.
  • the support structure includes a base plate 15 and a pair of upstanding arm members 16 extending approximately perpendicular from the base plate 15. All portions of the support structure are manufactured from a conductive material in order to transmit the sound waves from the transducer 10 to the surface 11 effectively.
  • the support structure illustrated in Figures 2 and 3 is manufactured from wood.
  • the ends of the rod 14 engage the upstanding arm members 16 of the support structure in a mortise and tenon attachment.
  • the base plate 15 is securely fastened relative to the surface 11 to be treated. This fastening is such that the rod 14 with the attendant aerials 13 extends in a configuration which is parallel to the surface 11 to be treated. For instance, when treating a boat hull, the transducer 10 is fitted beneath the floor of the boat adjacent the keel of the boat.
  • the aerials 13 are each formed into a coil about the rod 14.
  • Each coil when electrified, produces a magnetic field which in turn induces mechanical vibrations at an ultrasonic frequency in resonant magnetostrictive material which is attached relative to the surface 11 to be vibrated.
  • the aerials 13 are wrapped about the rod 14.
  • the two aerials 13 are wound about the rod 14 starting from the same point on the rod 14.
  • a minimum of seven revolutions may be required for the ultrasonic means to function optimally. It is preferred that each of the aerials 13 revolve in opposed directions about the rod 14, one in a clockwise direction and one in a counter-clockwise direction.
  • the aerials 13 are separated from one another and the distance between the aerials 13 is approximately 75 mm.
  • the aerials 13 are typically separable from the supply cables 12.
  • an attachment means 17 is provided and the attachment means 17 allows transmission of an electrical and/or an ultrasonic signal to the transducer 10.
  • the polar axis of the coils will be coaxial.
  • the power supply creates a modulating ultrasonic field around the aerials 13, the field ranging in frequency from 50 to 80000 hertz.
  • the power supply supplies a signal at a variable frequency (or sweeping frequency) to each of the aerials 13.
  • the signal frequency starts at approximately 15 kilohertz and increases by 2 kilohertz over each two minute period. When a frequency of 71 kilohertz is reached, the frequency drops to 15 kilohertz and repeats the above process. Because magnetostrictive materials behave identically to a magnetic field of either polarity, the frequency of the electrical energy applied to the transducer is approximately 1/2 of the desired output frequency.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physical Water Treatments (AREA)

Abstract

L'invention concerne un système antisalissure marin destiné à une surface marine (11) telle qu'une coque de bateau, des navires ou des structures sous-marines. Le système comprend au moins un moyen de génération et de transmission d'ultrasons, le système comprend également un transducteur (10) présentant un fonctionnement au moins partiellement magnétique. Le transducteur comporte un axe polaire et il est fixé sur la surface de telle sorte que l'axe polaire soit parallèle à la surface. Le transducteur (10) comprend une tige (14) constituée d'un matériau magnétostrictif, habituellement du bois, autour duquel sont enroulées deux antennes (13) pour former une bobine. La tige est positionnée au moyen d'une structure de support d'une plaque de base (15) et d'une paire d'éléments de bras droits (16). De l'énergie est fournie par des câbles (12) pour créer un champ ultrasonore de modulation autour des antennes (13) et le champ ultrasonore s'étend en fréquence de 50 à 80 000 hertz.
PCT/AU2005/001676 2004-10-29 2005-10-31 Systeme antisalissure marin utilisant des ultrasons Ceased WO2006045161A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2004906233A AU2004906233A0 (en) 2004-10-29 A Marine Anti-Fouling System
AU2004906233 2004-10-29

Publications (1)

Publication Number Publication Date
WO2006045161A1 true WO2006045161A1 (fr) 2006-05-04

Family

ID=36226757

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2005/001676 Ceased WO2006045161A1 (fr) 2004-10-29 2005-10-31 Systeme antisalissure marin utilisant des ultrasons

Country Status (1)

Country Link
WO (1) WO2006045161A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009150437A3 (fr) * 2008-06-14 2010-08-26 Blue & Green Marine Limited Dispositif antisalissure
US11583900B2 (en) 2019-01-23 2023-02-21 Isabela V. Perdomo Method and system for controlling marine growth using complex ultrasonic waveforms
SE2350063A1 (en) * 2023-01-25 2024-07-26 Rise Res Institutes Of Sweden Ab Acoustic anti-scaling arrangement for a marine vessel and method of controlling the arrangement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4943954A (en) * 1989-05-26 1990-07-24 Infrawave A/S Method and a system for counteracting marine biologic fouling of a hull or a submerged construction
US5143011A (en) * 1991-02-05 1992-09-01 Stephen Rabbette Method and apparatus for inhibiting barnacle growth on boats
US5532980A (en) * 1994-11-14 1996-07-02 Sciencetech Inc. Vibrational anti-fouling system
US5735226A (en) * 1996-05-08 1998-04-07 Sgp Technology, Inc. Marine anti-fouling system and method
WO1998038082A1 (fr) * 1997-02-28 1998-09-03 Oet Holdings Plc Procede permettant d'empecher le depot de salissures larvaires sur la coque d'un navire
US6285629B1 (en) * 1997-11-19 2001-09-04 Richter Corporation Method for preventing deterioration of submarine structure and ultrasonic vibration unit used for the method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4943954A (en) * 1989-05-26 1990-07-24 Infrawave A/S Method and a system for counteracting marine biologic fouling of a hull or a submerged construction
US5143011A (en) * 1991-02-05 1992-09-01 Stephen Rabbette Method and apparatus for inhibiting barnacle growth on boats
US5532980A (en) * 1994-11-14 1996-07-02 Sciencetech Inc. Vibrational anti-fouling system
US5735226A (en) * 1996-05-08 1998-04-07 Sgp Technology, Inc. Marine anti-fouling system and method
WO1998038082A1 (fr) * 1997-02-28 1998-09-03 Oet Holdings Plc Procede permettant d'empecher le depot de salissures larvaires sur la coque d'un navire
US6285629B1 (en) * 1997-11-19 2001-09-04 Richter Corporation Method for preventing deterioration of submarine structure and ultrasonic vibration unit used for the method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009150437A3 (fr) * 2008-06-14 2010-08-26 Blue & Green Marine Limited Dispositif antisalissure
WO2009150436A3 (fr) * 2008-06-14 2010-08-26 Blue & Green Marine Limited Dispositif antisalissure
US11583900B2 (en) 2019-01-23 2023-02-21 Isabela V. Perdomo Method and system for controlling marine growth using complex ultrasonic waveforms
US11858014B2 (en) 2019-01-23 2024-01-02 Isabela V. Perdomo Method and system for controlling marine growth using complex ultrasonic waveforms
SE2350063A1 (en) * 2023-01-25 2024-07-26 Rise Res Institutes Of Sweden Ab Acoustic anti-scaling arrangement for a marine vessel and method of controlling the arrangement
WO2024156647A1 (fr) * 2023-01-25 2024-08-02 Rise Research Institutes of Sweden AB Agencement anti-tartre acoustique pour navire et procédé de commande de l'agencement
SE546277C2 (en) * 2023-01-25 2024-09-17 Rise Res Institutes Of Sweden Ab Acoustic anti-scaling arrangement for a marine vessel and method of controlling the arrangement

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