Inflatable space habitat

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Inflatable station concept during testing (NASA 1961)
Inflatable lunar habitat proposal (NASA 1989)

Inflatable habitats or expandable habitats are pressurized structures capable of supporting life in outer space whose internal volume increases after launch. They have frequently been proposed for use in space applications to provide a greater volume of living space for a given mass.

The first serious design and manufacture of an inflatable space habitat was in 1961 with a space station design produced by Goodyear (although this design was never flown).[1] A proposal released in 1989 by Johnson Space Center's Man Systems Division outlined a 16 metres (52 ft) diameter spherical habitat lunar outpost which was partially buried in the lunar surface.

An inflatable module called TransHab (a portmanteau of Trans Habitation) was proposed for the International Space Station,[2] and later the private company Bigelow Aerospace revived the design for use in a number of potential civil and commercial applications.[3][4]

Construction[edit]

The construction of an inflatable space habitat is determined by its design objectives. However common elements include interwoven layers of Kevlar and mylar around a flexible air bladder which is used to retain an atmosphere. The shape of the module is maintained by the pressure difference between the internal atmosphere and the outside vacuum. The inflatable Bigelow Aerospace modules have an internal core which provides structural support during its launch into orbit.

An artists rendering of the TransHab inflatable module berthed to the ISS.

Ongoing research[edit]

Currently the main areas of research are being undertaken by Bigelow Aerospace and NASA. NASA is currently studying inflatable lunar bases with the planetary surface habitat and airlock unit[5] which is in an early prototype phase, and has conceptual proposals for utilizing expandable-technology space structures in cislunar and interplanetary crewed exploration spacecraft.[6]

Bigelow Expandable Activity Module[edit]

The Bigelow Expandable Activity Module is a space station module under development as of March 2011 by Bigelow Aerospace, being purchased by NASA for flight to space and attachment to the International Space Station in 2015.[7]

Bigelow Commercial Space Station[edit]

The Bigelow Next-Generation Commercial Space Station, composed of two types of expandable space habitat modules, was announced in mid-2010.[8] The initial build-out of the station is expected in 2014/2015, and will consist of two Sundancer modules and one BA-330 module.[9] Bigelow has publicly shown space station design configurations with up to nine BA-300 modules containing 100,000 cu ft (2,800 m3) of habitable space[10] The BA-330 is in final design with construction getting underway in 2011. Bigelow began to publicly refer to the initial configuration—two Sundancer modules and one BA-330 module—as "Space Complex Alpha" in October 2010.[11]

Bigelow recently announced that it has agreements with six sovereign states to utilize on-orbit facilities of the commercial space station: United Kingdom, Netherlands, Australia, Singapore, Japan and Sweden.[10]

NASA Multi-Mission Space Exploration Vehicle[edit]

Main article: Nautilus-X

In early 2011, NASA put forward a conceptual proposal for a long-duration crewed space transport vehicle which includes an artificial gravity space habitat intended to promote crew-health for a crew of up to six persons on missions of up to two years duration. Called the Multi-Mission Space Exploration Vehicle (MMSEV), the partial-g torus-ring centrifuge would utilize both standard metal-frame and inflatable spacecraft structures and would provide 0.11 to 0.69g.[6][12]

Related to MMSEV is the ISS Centrifuge Demo, proposed in 2011 as a demonstration project preparatory to the final design of the larger torus centrifuge space habitat for the Multi-Mission Space Exploration Vehicle. The structure would have an outside diameter of 30 feet (9.1 m) with a 30 inches (760 mm) ring interior cross-section diameter and would provide 0.08 to 0.51g partial gravity. This test and evaluation centrifuge would have the capability to become a sleep module for ISS crew.[6]

Advantages[edit]

  • Because the diameter of the habitat is not strictly constrained by the diameter of the launch vehicle, inflatables can have a greater volume of living space for a given mass.
  • (some designs) higher resistance to space debris. For example, the BA 330 provides ballistic protection superior to traditional aluminum shell designs.[13]
  • (some designs) provide higher levels of shielding against radiation. For example, the BA 330 provides radiation protection equivalent to or better than the International Space Station, "and substantially reduces the dangerous impact of secondary radiation."[13]

Flight experience[edit]

Currently the only designs that have flown in space have been the Genesis I and Genesis II modules from Bigelow Aerospace.

See also[edit]

References[edit]

  1. ^ "GPN-2003-00106 - Inflatable Station Concept". 
  2. ^ Kim Dismukes (curator) (2003-06-27). "TransHab Concept". NASA.gov. Retrieved 2007-06-10. 
  3. ^ Holidays in space are on the horizon, New Scientist article (September 4, 2004)
  4. ^ [1], BBC article (July 23, 2010)
  5. ^ "NASA - Camping on the Moon Will Be One Far Out Experience". 
  6. ^ a b c NAUTILUS - X: Multi-Mission Space Exploration Vehicle, Mark L. Holderman, Future in Space Operations (FISO) Colloquium, 2011-01-26, accessed 2011-01-31.
  7. ^ Lindsey, Clark (January 16, 2013). "NASA and Bigelow release details of expandable module for ISS". NewSpace Watch. Archived from the original on February 16, 2013. 
  8. ^ Bigelow Aerospace — Next-Generation Commercial Space Stations: Orbital Complex Construction, Bigelow Aerospace, accessed 2010-07-15.
  9. ^ Bigelow Marketing Inflatable Space Stations, Aviation Week, 2010-05-06, accessed 2010-10-30.
  10. ^ a b Bigelow Aerospace Shows Off Bigger, Badder Space Real Estate, Popular Mechanics, 2010-10-28, accessed 2010-10-30.
  11. ^ Bigelow still thinks big, The Space Review, 2010-11-01, accessed 2010-11-02.
  12. ^ NASA NAUTILUS-X: multi-mission exploration vehicle includes centrifuge, which would be tested at ISS, RLV and Space Transport News, 2011-01-28, accessed 2011-01-31.
  13. ^ a b Bigelow Aerospace — Next-Generation Commercial Space Stations: BA 330, Bigelow Aerospace, 2010, accessed 11 Jan 2011.

External links[edit]