EP2029425B1 - A method for wave propulsion of watercrafts - Google Patents

A method for wave propulsion of watercrafts Download PDF

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Publication number
EP2029425B1
EP2029425B1 EP07747740.4A EP07747740A EP2029425B1 EP 2029425 B1 EP2029425 B1 EP 2029425B1 EP 07747740 A EP07747740 A EP 07747740A EP 2029425 B1 EP2029425 B1 EP 2029425B1
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EP
European Patent Office
Prior art keywords
arms
wave
propeller
watercraft
locomotor
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EP07747740.4A
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German (de)
French (fr)
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EP2029425A2 (en
Inventor
Michal Latacz
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Individual
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Priority to PL07747740T priority Critical patent/PL2029425T3/en
Priority to SI200731607T priority patent/SI2029425T1/en
Publication of EP2029425A2 publication Critical patent/EP2029425A2/en
Application granted granted Critical
Publication of EP2029425B1 publication Critical patent/EP2029425B1/en
Priority to CY20151100164T priority patent/CY1116021T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/30—Propulsive elements directly acting on water of non-rotary type
    • B63H1/37—Moving-wave propellers, i.e. wherein the propelling means comprise a flexible undulating structure

Definitions

  • the object of the invention is a method for wave propulsion of watercrafts, surface or underwater ones.
  • Wave propulsion in known watercrafts is generated by putting into self-aligning or reciprocating motion, in the plane perpendicular to the liquid flow direction, a specific number of arms, to which, at a part of their length projecting from the hull of the watercraft, a surface propeller is attached.
  • the arms are moved only with the possibility to change frequency while maintaining a constant amplitude of motion.
  • Hydrodynamic efficiency of propulsion with the locomotor wave or constant amplitude is significantly undervalued in the conditions of change in the desired speed of the watercraft mainly due to swirls in the flow occurring along the surface propeller.
  • a method for generating flow motion of watercraft referred to in the present invention uses, similarly to aforesaid solutions, motion generation in the plane perpendicular to the direction of fluid flow, generating motion of a certain number of arms, which at a part of their lengths project from the hull of the craft, and to which the surface propeller is attached.
  • the essence of the invention consists in that the arms generate locomotor wave of variable characteristic, wherein the values of neighbouring amplitudes of the locomotor wave at a given moment are not constant but increase with the distance from the head of the system towards its centre so that the ratio between the currently neighbouring amplitudes ranges from 1 to 2.
  • an outline of the contour of the surface of the propeller is curve-shaped when the arms are arranged in the same plane, and the outline of the contour is symmetrical to the symmetry axis of the propeller.
  • the solution according to the present invention forces the wave flow of fluid, which in combination with a system of independently movable, self-aligning or reciprocating elements constituting a single and flexible set of structural elements, enables generation of the locomotor wave.
  • the parameters of the wave i.e. amplitudes or particular arms peaks and operational frequency, may be modified as a function of the fluid flow velocity lengthways the propeller, in real time, in a constant and independent manner.
  • the result of controlling the wave characteristics and specific geometry of the propeller is security of the laminar flow of fluid along its surface and ensuring optimum parameters of the locomotor wave, resulting from the mechanics of a given fluid, wherein the parameters comply with the required fluid flow velocity after the surface propeller is properly immersed in the fluid, which hence ensures improvement of the hydrodynamic efficiency rate.
  • FIG. 1 a perspective projection of a single propelling device
  • figure 2 one of the methods for the layout of two surface propellers in watercraft
  • figure 3 geometry of the locomotor curve at a moment of accelerating the watercraft from zero velocity
  • figure 4 geometry of the curve at the moment when the watercraft reaches an average progressive velocity
  • figure 5 geometry of the locomotor curve at the moment when the watercraft reaches its maximum progressive velocity
  • figure 6 contour of the surface propeller in the horizontal projection
  • figure 7 possible configuration options for the propeller of a single and double hull watercraft and submarine.
  • a method of controlling the propulsion was shown based on the propelling system with the self-aligning arms, as shown in figure 1 .
  • the surface propeller (1) is a flexible rubber membrane connecting particular arms (2).
  • the water is relocated perpendicular to the plane of arms (2) oscillation.
  • Hydraulic bilateral actuators were used as motion generators (3).
  • Each generator (3) is connected with two independent distributors (7).
  • the system is equipped in the overflow tank (6) and the constant discharge pump (8), which delivers the working agent parallel to all generators (3).
  • Change in the characteristics of the locomotor waves which is shown nationally in figures 3, 4 , and 5 , is obtained by means of changing the opening time of distributors (7) valves, controlled by the electronic central control unit (4).
  • the software controlling the operation of distributors ensures selection of wave characteristics depending on the velocity of the watercraft required by the operator as well as the current velocity of the watercraft. If velocity of the watercraft increases from zero, i.e. when the watercraft starts moving, wave amplitudes (A) are relatively high and operational frequency of the system is low, as shown in figure 3 . When progressive velocity increases, amplitudes (A) of the motion of particular arms (2) decrease and frequency of the entire system increases, which is shown in figure 4 , until it reaches the maximum value, as shown in figure 5 , when operational frequency reaches its maximum value.

Description

  • The object of the invention is a method for wave propulsion of watercrafts, surface or underwater ones.
  • Currently a number of devices use wave propellers for propelling watercraft, in which liquids are mixed perpendicular to the plane of the elements' oscillation.
  • Wave propulsion in known watercrafts is generated by putting into self-aligning or reciprocating motion, in the plane perpendicular to the liquid flow direction, a specific number of arms, to which, at a part of their length projecting from the hull of the watercraft, a surface propeller is attached. In most known solutions, presented for example in patent specifications US 3620651 , US 5611666 , RU 2009958 and ES 2170004 , the arms are moved only with the possibility to change frequency while maintaining a constant amplitude of motion. Hydrodynamic efficiency of propulsion with the locomotor wave or constant amplitude is significantly undervalued in the conditions of change in the desired speed of the watercraft mainly due to swirls in the flow occurring along the surface propeller.
  • From patent specification EP 0903288 , which represents the prior art closest to the subject-matter of independent claim 1, a solution of a watercraft with a wave propulsion is also known, in which each of the arms performing motion in the plane perpendicular to the liquid flow direction is driven by an individual generator of variable amplitude and frequency of movements, which are controlled by a central electronic control unit. The specification does not disclose a method for controlling the parameters of initiated locomotor wave in order to increase hydrodynamic efficiency of propulsion at different speeds of the watercraft.
  • A method for generating flow motion of watercraft referred to in the present invention uses, similarly to aforesaid solutions, motion generation in the plane perpendicular to the direction of fluid flow, generating motion of a certain number of arms, which at a part of their lengths project from the hull of the craft, and to which the surface propeller is attached. The essence of the invention consists in that the arms generate locomotor wave of variable characteristic, wherein the values of neighbouring amplitudes of the locomotor wave at a given moment are not constant but increase with the distance from the head of the system towards its centre so that the ratio between the currently neighbouring amplitudes ranges from 1 to 2.
  • Advantageously, an outline of the contour of the surface of the propeller is curve-shaped when the arms are arranged in the same plane, and the outline of the contour is symmetrical to the symmetry axis of the propeller.
  • The solution according to the present invention forces the wave flow of fluid, which in combination with a system of independently movable, self-aligning or reciprocating elements constituting a single and flexible set of structural elements, enables generation of the locomotor wave. The parameters of the wave, i.e. amplitudes or particular arms peaks and operational frequency, may be modified as a function of the fluid flow velocity lengthways the propeller, in real time, in a constant and independent manner. The result of controlling the wave characteristics and specific geometry of the propeller is security of the laminar flow of fluid along its surface and ensuring optimum parameters of the locomotor wave, resulting from the mechanics of a given fluid, wherein the parameters comply with the required fluid flow velocity after the surface propeller is properly immersed in the fluid, which hence ensures improvement of the hydrodynamic efficiency rate.
  • A method according to the invention is explained on the basis of a description of how a sample watercraft (shown in the figure) solution works and what its structure is. Figure 1 - a perspective projection of a single propelling device; figure 2 - one of the methods for the layout of two surface propellers in watercraft; figure 3 - geometry of the locomotor curve at a moment of accelerating the watercraft from zero velocity; figure 4 - geometry of the curve at the moment when the watercraft reaches an average progressive velocity; figure 5 - geometry of the locomotor curve at the moment when the watercraft reaches its maximum progressive velocity; figure 6 - contour of the surface propeller in the horizontal projection; figure 7 - possible configuration options for the propeller of a single and double hull watercraft and submarine.
  • A method of controlling the propulsion was shown based on the propelling system with the self-aligning arms, as shown in figure 1. In the option shown, the surface propeller (1) is a flexible rubber membrane connecting particular arms (2). The water is relocated perpendicular to the plane of arms (2) oscillation. Hydraulic bilateral actuators were used as motion generators (3). Each generator (3) is connected with two independent distributors (7). The system is equipped in the overflow tank (6) and the constant discharge pump (8), which delivers the working agent parallel to all generators (3). Change in the characteristics of the locomotor waves, which is shown nationally in figures 3, 4, and 5, is obtained by means of changing the opening time of distributors (7) valves, controlled by the electronic central control unit (4). The software controlling the operation of distributors ensures selection of wave characteristics depending on the velocity of the watercraft required by the operator as well as the current velocity of the watercraft. If velocity of the watercraft increases from zero, i.e. when the watercraft starts moving, wave amplitudes (A) are relatively high and operational frequency of the system is low, as shown in figure 3. When progressive velocity increases, amplitudes (A) of the motion of particular arms (2) decrease and frequency of the entire system increases, which is shown in figure 4, until it reaches the maximum value, as shown in figure 5, when operational frequency reaches its maximum value. The values of neighbouring amplitudes (A) of the locomotor wave at a given moment are not constant but they increase with the distance from the head of the system towards its centre, and shown in figures 3, 4 and 5. Symbol VC refers to relative liquid flow velocity, and symbol Vp refers to an absolute progressive velocity of the watercraft.

Claims (3)

  1. A method for wave propulsion of watercrafts, which consists in that a specific number of arms (2) are put into motion in the plane perpendicular to the liquid flow direction, and the arms at a certain part of their length project from the hull of the watercraft, and to which a surface propeller (1) is attached, wherein each of the arms (2) performing a self-aligning or reciprocating motion is propelled with an individual generator (3) of variable amplitude (A) and frequency (f) of displacements, controlled by a central electronic control unit (4), characterised in that the arms (2) generate a locomotor wave of variable characteristic, wherein the values of neighbouring amplitudes (A1, A2 ; A2,A3 ; ...) of the locomotor wave at a given moment are not constant but increase with the distance from the head of the system towards its centre so that the ratio (s) between the currently neighbouring amplitudes (A2/A1 ; A3/A2 ; ...) of the wave ranging from 1 to 2.
  2. A method according to claim 1, characterised in that the outline of the contour (5) of the surface of the propeller (1) is curve-shaped when the arms (2) are arranged in the same plane.
  3. A method according to claim 2, characterised in that the outline of the contour (5) is symmetrical to the symmetry axis of the propeller (1).
EP07747740.4A 2006-05-29 2007-05-28 A method for wave propulsion of watercrafts Active EP2029425B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL07747740T PL2029425T3 (en) 2006-05-29 2007-05-28 A method for wave propulsion of watercrafts
SI200731607T SI2029425T1 (en) 2006-05-29 2007-05-28 A method for wave propulsion of watercrafts
CY20151100164T CY1116021T1 (en) 2006-05-29 2015-02-17 METHOD FOR WAVY PROMOTION OF FLOATING INSTRUMENTS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL379796A PL215828B1 (en) 2006-05-29 2006-05-29 The manner of wave drive of floating units
PCT/PL2007/000031 WO2007139408A2 (en) 2006-05-29 2007-05-28 Method for generating wave motion for propulsion of watercraft

Publications (2)

Publication Number Publication Date
EP2029425A2 EP2029425A2 (en) 2009-03-04
EP2029425B1 true EP2029425B1 (en) 2014-11-19

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ID=38577645

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EP07747740.4A Active EP2029425B1 (en) 2006-05-29 2007-05-28 A method for wave propulsion of watercrafts

Country Status (8)

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EP (1) EP2029425B1 (en)
CY (1) CY1116021T1 (en)
DK (1) DK2029425T3 (en)
ES (1) ES2530076T3 (en)
PL (2) PL215828B1 (en)
PT (1) PT2029425E (en)
SI (1) SI2029425T1 (en)
WO (1) WO2007139408A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11465728B2 (en) * 2019-05-30 2022-10-11 Pliant Energy System LLC Aerial swimmer apparatuses, methods and systems

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8610304B2 (en) * 2007-05-01 2013-12-17 Pliant Energy Systems Llc Mechanisms for creating undulating motion, such as for propulsion, and for harnessing the energy of moving fluid
US9145875B2 (en) 2007-05-01 2015-09-29 Pliant Energy Systems Llc Ribbon transducer and pump apparatuses, methods and systems
FR2942451B1 (en) * 2009-02-26 2011-05-06 Andre Schaer METHOD AND DEVICE FOR UNDERWATER PROPULSION BASED ON THE TRAINING AND CARRYING OF A DEFORMABLE ELEMENT FOR DISCRETE MISSIONS
KR101549772B1 (en) 2014-01-17 2015-09-04 김달현 Propulsion Device for Moving Body using Progressive Wave Motion combined with Reciprocating Motion and Method thereof
CN106043643B (en) * 2016-06-06 2017-10-31 南京航空航天大学 Undulatory propulsion bionic machine ray fish and its method of work
CN108146600B (en) * 2017-12-18 2020-04-28 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） Bionic underwater vehicle propelled by long fin torsional waves and motion mode thereof
CN109131807A (en) * 2018-10-24 2019-01-04 上海海洋大学 A kind of bionical Bluepoint ray underwater propeller
WO2020152502A1 (en) * 2019-01-24 2020-07-30 Ecole Polytechnique Federale De Lausanne (Epfl) Propulsion module for generating wave-like motion
CN113022242B (en) * 2021-04-14 2022-10-28 哈尔滨工程大学 Amphibious bionic propeller with controllable waveform
WO2023102775A1 (en) * 2021-12-08 2023-06-15 西湖大学 Underwater vehicle

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Publication number Priority date Publication date Assignee Title
DE98999C (en) * 1897-07-18 1898-09-27 M.H.C. Shann METHOD AND DEVICE FOR MOVING SHIPS
US3435800A (en) 1967-05-15 1969-04-01 Jean Pierre F Osterwalder Marine propulsion system
GB1302541A (en) 1969-02-07 1973-01-10
RU2009958C1 (en) 1991-01-08 1994-03-30 Александр Геннадьевич Михайлов Ship's propeller
US5611666A (en) * 1996-04-02 1997-03-18 Au; Ching Y. Fluid forcing device
JP3416522B2 (en) * 1997-09-18 2003-06-16 三菱重工業株式会社 Underwater vehicle with vibrating wings
ES2170004B1 (en) 2000-07-31 2003-11-01 Univ De A Coruna WAVING DRIVE SYSTEM.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11465728B2 (en) * 2019-05-30 2022-10-11 Pliant Energy System LLC Aerial swimmer apparatuses, methods and systems

Also Published As

Publication number Publication date
WO2007139408B1 (en) 2008-09-04
PL379796A1 (en) 2007-12-10
PT2029425E (en) 2015-02-27
PL215828B1 (en) 2014-01-31
CY1116021T1 (en) 2017-01-25
SI2029425T1 (en) 2015-04-30
PL2029425T3 (en) 2015-08-31
EP2029425A2 (en) 2009-03-04
WO2007139408A2 (en) 2007-12-06
DK2029425T3 (en) 2015-02-16
ES2530076T3 (en) 2015-02-26
WO2007139408A3 (en) 2008-07-03

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