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HIAD Advancements and Extension of Mission ApplicationsThe Hypersonic Inflatable Aerodynamic Decelerator (HIAD) technology has made significant advancements over the last decade with flight test demonstrations and ground development campaigns. The first generation (Gen-1) design and materials were flight tested with the successful third Inflatable Reentry Vehicle Experiment flight test of a 3-m HIAD (IRVE-3). Ground development efforts incorporated materials with higher thermal capabilities for the inflatable structure (IS) and flexible thermal protection system (F-TPS) as a second generation (Gen-2) system. Current efforts and plans are focused on extending capabilities to improve overall system performance and reduce areal weight, as well as expand mission applicability. F-TPS materials that offer greater thermal resistance, and ability to be packed to greater density, for a given thickness are being tested to demonstrated thermal performance benefits and manufacturability at flight-relevant scale. IS materials and construction methods are being investigated to reduce mass, increase load capacities, and improve durability for packing. Previous HIAD systems focused on symmetric geometries using stacked torus construction. Flight simulations and trajectory analysis show that symmetrical HIADs may provide L/D up to 0.25 via movable center of gravity (CG) offsets. HIAD capabilities can be greatly expanded to suit a broader range of mission applications with asymmetric shapes and/or modulating L/D. Various HIAD concepts are being developed to provide greater control to improve landing accuracy and reduce dependency upon propulsion systems during descent and landing. Concepts being studied include a canted stack torus design, control surfaces, and morphing configurations that allow the shape to be actively manipulated for flight control. This paper provides a summary of recent HIAD development activities, and plans for future HIAD developments including advanced materials, improved construction techniques, and alternate geometry concepts that will greatly expand HIAD mission applications.
Document ID
Document Type
Conference Paper
Johnson, R. Keith (NASA Langley Research Center Hampton, VA, United States)
Cheatwood, F. McNeil (NASA Langley Research Center Hampton, VA, United States)
Calomino, Anthony M. (NASA Langley Research Center Hampton, VA, United States)
Hughes, Stephen J. (NASA Langley Research Center Hampton, VA, United States)
Korzun, Ashley M. (NASA Langley Research Center Hampton, VA, United States)
DiNonno, John M. (NASA Langley Research Center Hampton, VA, United States)
Lindell, Mike C. (NASA Langley Research Center Hampton, VA, United States)
Swanson, Greg T. (Analytical Mechanics Associates, Inc. Moffett Field, CA, United States)
Date Acquired
August 11, 2016
Publication Date
June 13, 2016
Subject Category
Spacecraft Design, Testing and Performance
Report/Patent Number
Meeting Information
International Planetary Probe Workshop(Laurel, MD)
Funding Number(s)
WBS: WBS 677714.01.07
Distribution Limits
Public Use Permitted.

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