1 Inflatable structures Ir. J. Breukels Room 10.08 [email protected].
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Transcript of 1 Inflatable structures Ir. J. Breukels Room 10.08 [email protected].
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Inflatable structures
Definition:
An inflatable structure is a membrane structure which requires a tensile pre-stress, created by a pressure difference, to bear externally applied loads.
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Applications
- Civil engineering
- Aeronautics
- Space
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Applications
Civil engineering
Property of Prospective Concepts, Switserland.
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Applications
Civil engineering
Property of Prospective Concepts, Switserland.
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Applications
Civil engineering
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Applications
Aeronautics
Goodyear Inflatoplane
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Applications
Aeronautics
Prospective Concepts Stingray
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Applications
Aeronautics
GLOV (Gun Launched Observation Vehicle)
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Applications
Aeronautics
Inflatable kites
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Applications
Space
Inflatable re-entry vehicle
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Applications
Space
Inflatable solar concentrators
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Regular beams vs Inflatable beams
Regular beam mechanics
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Regular beams vs Inflatable beams
Inflatable beam mechanics
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The principle of wrinkling
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Wrinkling criteria
Wrinkling criteria based on stress
When σ = σ Wrinkling occursbending Pressure
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Wrinkling criteria
Wrinkling criteria based on strain
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Wrinkling propagation
Wrinkling criteria based on strain
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Three states of an inflatable beam
-Unwrinkled
-Wrinkled
-Collapsed
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Moment – Deflection curve
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Moment – Deflection curve
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Moment – Deflection curve
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Tapered beams
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Tensairity® Synergetic combination of an airbeam with conventional cables and struts.
Compression (strut)
Tension (cable)
Stabilization (air)
Tensairity® = Tension + Air + Integrity
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Tensairity®
Property of Prospective Concepts, Switserland.
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Tensairity®
Property of Prospective Concepts, Switserland.
Tensairity® demonstration bridge, 8m span, 3.5 t max. load
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Building wings with inflatables
-Constructing airfoils with tubes
-Sailwings
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Building wings with inflatables
Constructing airfoils with tubes
Pro: - Good airfoil shape
Con: - Complex
- Heavy
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Building wings with inflatables
Constructing airfoils with tubes
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Building wings with inflatables
Sailwings
Pro: - Simple
- light
Con: - airfoil arbitrarily defined
- only one tube to carry loads
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Building wings with inflatables
Sailwings
Straight tapered wing
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Building wings with inflatables
Sailwings
Elliptical wing
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Building wings with inflatables
Sailwings
Arcs (surfkites)
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Inflatable wings and control
-Conventional control surfaces
- Wing morphing
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Inflatable wings and control
Nature’s solution to flight control
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Inflatable wings and control
The early days
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How to morph an inflatable wing
-Pressure variation
-Nastic structures
-Bump flattening
-Trailing edge deflection
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How to morph an inflatable wing
Pressure variation
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How to morph an inflatable wing
Nastic structures
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How to morph an inflatable wing
Nastic structures
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How to morph an inflatable wing
Nastic structures
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How to morph an inflatable wing
Bump flattening
PZT -> Lead Zirconium Titrate
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How to morph an inflatable wing
Bump flattening
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How to morph an inflatable wing
Trailing edge deflection
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How to morph an inflatable wing
Trailing edge deflection
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Questions?
