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Meissner- Ochsenfeld effect based actuation of high lift surfaces

IP.com Disclosure Number: IPCOM000247259D
Publication Date: 2016-Aug-18
Document File: 13 page(s) / 2M

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The IP.com Prior Art Database

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Meissner - high lift surfaces: IP.COM

Abstract

A solution to the technical problem is to provide a device and method for the efficient high lift surface actuation based on the Meissner-Ochsenfeld effect to replace bulky and heavy hydraulic as well as pure electrical actuation. For overview of the state of the art for Meissner-Ochsenfeld effect see Appendix 1.

The basics of this solution are summarized as follows: • Tailored track for sets of couples of magnets and cryostats • Stopper inside wing box that can handle force from magnets and cryostats • Series of magnets and cryostats, connect pair wise to each other • Attachment at movable high lift surface to be pushed/pulled by series of magnets/cryostats • Cryostats to be cooled to a temperature just below the step temperature of the super conducting material block inside them. • Electro-magnets wired to flight control system so their power can be controlled • Increasing electro magnet power will move the high lift surface by pushing it along the tracks • The high-lift surface will hereby function as if it were actuated hydraulically or electrically, just faster and by less weight.

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Page 01 of 13


1. TITLE:

Meissner- Ochsenfeld effect based actuation of high lift surfaces.


2. TECHNICAL FIELD OF IDEA:

Aerospace Structures; Airframe, Wing, actuation, High-lift surfaces


3. TECHNICAL PROBLEM

Civil aircraft need a considerable amount of high lift surfaces that must be actuated. The reasons are; the aircraft are large and heavy, and the wings must be kept reasonably compact out of space and weigh reasons.

The high lift surfaces consist of: flaps, ailerons, slats, (and to some degree in the same category: spoilers, although they do not specifically lift)


Page 02 of 13

The largest high-lift surfaces that need most actuation power are usually the inner flaps. Their function is to increase high lift at limited travelling speeds, such as at take-off and at landing. The function is shown in Figs. 1 through 3. Figure 1 shows position at cruise speed, i.e. the flap is retracted. Fig. 2 shows position at take -off, when more hi lift is needed, and the flap is extended with at a few degrees angle and no passage of air between wing and flap. In Figure 3 is shown position at landing, with the flap fully extended at an angle typically over 35°. Here is a clear gap visible between wing and flap.

For other high lift surfaces, such as the slats (seen to the left in the figure) as well as ailerons, apply similar principles, but in the following the example used here is the one of the flap.


Page 03 of 13

It is seen in Figs. 1 to 3 that the flap is extended and changes angle as a function of its extension. Until now the connection of flap and wing is based on mechanical systems. The operation of these is performed by hydraulic or electric engines.

As seen in Figs. 1 - 3 the systems typically require space outside the actual wing profile. In this case the mechanical system requires space beneath the wing and this is covered in an aerodynamic fairing to reduce drag. These systems are heavy and do disturb airflow. Furthermore they require maintenance, and are subject to mechanical wear.


Page 04 of 13


4. TECHNICAL SOLUTION:


4.1 SUMMARY OF SOLUTION

A solution to the technical problem is to provide a device and method for the efficient high lift surface actuation based on the Meissner-Ochsenfeld effect to replace bulky and heavy hydraulic as well as pure electrical actuation. For overview of the state of the art for Meissner-Ochsenfeld effect see Appendix 1.

The basics of this solution are summarized as follows:

• Tailored track for sets of couples of magnets and cryostats

• Stopper inside wing box that can handle force from magnets and cryostats

• Series of magnets and cryostats, connect pair wise to each other

• Attachment at movable high lift surface to be pushed/pulled by series of magnets/cryostats

• Cryostats to be cooled to a temperature just below the step temperature of the super conducting material block inside them.

• Electro-magnets wired to flight control system so their power can be controlled

• Increasing electro magnet po...