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Oscillating foil propulsion system and method for controlling a motion of an oscillating movable foil

Inactive Publication Date: 2015-11-19
ABB OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention improves the efficiency of a foil propulsor, reducing fuel consumption and emissions. It also reduces the size of fuel tanks, allowing more payload on board. Model tests demonstrate that the efficiency of the foil propulsor can reach 50%-70%, similar to conventional propellers. The invention is suitable for horizontally positioned foils and vessels with limited draught. The hydrofoil further reduces noise and vibrations. The absence of vertical connecting rods improves the strength and stability of the propulsion system. These advantages improve safety over prior art.

Problems solved by technology

Further optimization of conventional screw propellers has become more difficult and therefore new propulsive devices are needed, which, for example, produce thrust by a movement of an oscillating fin, which mimics the manner in which dolphins or whales swim.
Therefore, the apparatus according to document US 2011 / 0255971 A1 allows adjustment of the frequency of the sinusoidal like pitch and heave motion of the foil by adjusting the speed of revolution of the crank mechanisms, but does not allow controlled adjustment of the peak amplitude of the pitch and heave motion, for example, to adjust the angle of attack depending on the direction and velocity of the oncoming local fluid flow in the foil working area.

Method used

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  • Oscillating foil propulsion system and method for controlling a motion of an oscillating movable foil
  • Oscillating foil propulsion system and method for controlling a motion of an oscillating movable foil
  • Oscillating foil propulsion system and method for controlling a motion of an oscillating movable foil

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first embodiment

[0043]In FIG. 1 a schematic view of a propulsion system 1 according to the invention is illustrated. The propulsion system 1 includes a movable foil 2 which is arranged in a fluid 3 outside a body 4. The system 1 further includes a pitch mechanism 5 for adjusting a pitch angle α(t) between the chord line c of the foil 2 and a horizontal plane HP, a frequency f1(t) of the pitch motion, and an amplitude A1(t) of the pitch motion of the movable foil 2. The system 1 also includes a heave mechanism 6 for adjusting a heave h(t) of the movable foil in vertical direction, a frequency f2(t) of the heave motion, and an amplitude A2(t) of the heave motion of the movable foil 2. The pitch and heave mechanisms 5, 6 are arranged inside the body 4. A connector 7 is extending from outside the body 4 to inside the body 4 and is connected to and adapted to interact with the pitch mechanism 5, the heave mechanism 6 and the movable foil 2. The movable foil may have a symmetrical or asymmetrical profile...

second embodiment

[0044]In FIG. 2 a schematic view of a propulsion system 1 according to the invention is illustrated. The propulsion system 1 includes a movable foil 2, which is arranged in a fluid 3 outside a body 4. The system 1 further includes a pitch mechanism 5 for adjusting a pitch angle α(t), a frequency f1(t) of the pitch motion, and an amplitude A1(t) of the pitch motion of the movable foil 2 and a heave mechanism 6 for adjusting a heave h(t), a frequency f2(t) of the heave motion, and an amplitude A2(t) of the heave motion of the movable foil 2. The pitch and heave mechanisms 5, 6 are arranged inside the body 4. The pitch mechanism 5 includes a first crank mechanism 8, a movable pitch slider 9 which is connected to the first crank mechanism 8 on one side, and rack pinions 10 which are connected to, arranged on, or an integral part of the pitch slider 9. The heave mechanism 6 includes a second crank mechanism 11, a movable heave slider 12 which is connected to the second crank mechanism 11...

third embodiment

[0045]In FIG. 3 a schematic view of a crank mechanism 8, 11 of a pitch or heave mechanism 5, 6 of a propulsion system 1 according to the invention is illustrated. At least one power source, which is not shown in FIG. 3, provides the first or second crank mechanism 8, 11 with rotational power which is transmitted to a rotating crank arm 16 which is rotatable about a first axis of rotation 17 or a fourth axis of rotation 23, respectively, and having a first crank pin 18 or a third crank pin 26, respectively, which is linearly movable in the longitudinal direction of the rotating crank arm 16. The first crank pin 18 represents the second axis of rotation 19 and the third crank pin 26 represents the fifth axis of rotation 24, respectively. A pitch rod 20 is rotatably connected at one end to said first crank pin 18 about the second axis of rotation 19 or a heave rod 30 is rotatably connected at one end to said third crank pin 26 about the fifth axis of rotation 24, respectively. A pitch ...

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Abstract

The invention relates to an oscillating foil propulsion system comprising a movable foil, a pitch mechanism connected to the movable foil and configured to control a pitch motion of the foil, a heave mechanism connected to the movable foil and configured to control a heave motion of the foil, and wherein at least one of the pitch and heave mechanisms is configured to adjust an amplitude of the respective motion of the movable foil. The invention further relates to a method for controlling a motion of an oscillating movable foil of a marine propulsion system.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to a marine propulsion system, in particular to an oscillating foil propulsion system. The present invention further relates to a method for controlling a motion of an oscillating movable foil of a marine propulsion system. Furthermore, the invention relates to a computer readable medium having stored thereon a set of computer implementable instructions. Additionally, the invention relates to a computer program.BACKGROUND OF THE INVENTION[0002]Many different marine propulsion devices for use in a fluid are known, by means of which a vessel can be propelled or propelled and steered. Typical propulsion systems include, for example, side paddle wheels, conventional screw propellers, podded propulsion devices, vertical axis propellers, sails, kite sails, or Flettner rotors.[0003]Presently, vessels, especially cargo vessels, are usually equipped with at least one screw propeller for propulsion. The efficiency of the prop...

Claims

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Application Information

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IPC IPC(8): B63H1/36
CPCB63H1/36
Inventor FENG, DAWEIDASTIDAR, SABYASACHI GOSHJAAKKOLA, ESAJAIN, RACHITJANARDHAN, RAHUL KALLADAKALLIS, VILLELUHTANEN, INKAMANGKHANKHUAL, H.NEUBAUER, JURGENPYOTSIA, VILLESALMINEN, PONTUS
Owner ABB OY
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