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Abstract
A geostationary stratospheric airship is lighter than air platform to be used for several civil and military purposes. In this study, the impact of Helium permeation through the hull and ballonet skin is considered. Mathematical modeling of the system is being done to estimate the amount of Helium and air transmission through the hull and the ballonet skin for a general airship system. Impact of permeation mainly affecting its ability to maintain constant altitude and a minimum level of differential pressure is shown in this study. A method is also devised so as to develop an open loop control system to maintain the altitude of the airship by maintaining the net vertical force due to buoyancy and weight on the airship as zero. Both the cases with and without the altitude control are simulated by numerically solving the model using RK4 algorithm. The results obtained are discussed and appropriate conclusions are drawn from the analysis.
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References
- Nayler, Arnold W. L., "Airship Development Worldwide - A 2001 Review", AIAA-2001-5263, Aircraft, Technology Integration, and Operations Forum, 1st, Los Angeles, CA, Oct. 16-18, 2001
- Nayler, Arnold W. L., "World-wide Airship Activity - A review", AIAA-1997-1417, AIAA Lighter-Than- Air Systems Technology Conference, 12th, San Francisco, CA, June 3-5, 1997, Technical Papers (A97-31253 08-01)
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- Raghavan, V., "Materials Science and Engineering", A First Course, 5th Ed.
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- Pino, M., Duckett, R.A. and Ward, I. M., "Single and Mixed Gas Diffusion Through Polyethylene Films Polymer, 46, 2005, 4882-4890, Elsevier.
- Sudhir Gupta., "Test Result of Fabric Sample", ADRDE/TechAero/Airship, 24 December 2001.
- Kang Wanggu, Suh Youngwook, Woo Kyeongsik and Lee In., "Mechanical Property Characterization of Film-Fabric Laminate for Stratospheric Airship Envelope", Composite Structures 75, 2006, 151-155, Elsevier.
- McDaniels Keith., Downs, R.J., Meldner Heiner., Beach Cameron and Adams Chris., "High Strengthto- Weight Ratio Non-Woven Technical Fabrics for Aerospace Applications", Cubic Tech Corp., Mesa, Arizona.
References
Nayler, Arnold W. L., "Airship Development Worldwide - A 2001 Review", AIAA-2001-5263, Aircraft, Technology Integration, and Operations Forum, 1st, Los Angeles, CA, Oct. 16-18, 2001
Nayler, Arnold W. L., "World-wide Airship Activity - A review", AIAA-1997-1417, AIAA Lighter-Than- Air Systems Technology Conference, 12th, San Francisco, CA, June 3-5, 1997, Technical Papers (A97-31253 08-01)
Khoury, G.A. and Gillett, J. D., "Airship Technology, Cambridge Aerospace Series", 10 ISBN 0 521 430 747, Cambridge University Press, 1999.
"Investigation of Various Parameters Affecting Altitude Performance of Tethered Aerostats", AIAA- 1995-1625, AIAA Lighter-Than-Air Systems Technology Conference, 11th, Clearwater Beach, FL, May 15-18, 1995, Technical Papers (A95-30317 07- 01), Washington, DC, American Institute of Aeronautics and Astronautics, 1995, p. 99-106.
Jones, S. P. and Thachf, D. Q., "Water Vapor Transmission Through Hull Material and Buoyancy of Aerostats", Journal of Aircraft, Vol. 33, No. 3, May- June 1996.
http://mathworld.wolfram.com/Runge-KuttaMeth od.html, Numerical Method for Solving Ordinary differential equations, Runge-Kutta Method.
Raghavan, V., "Materials Science and Engineering", A First Course, 5th Ed.
http://en.wikipedia.org/wiki/Permeation
Pino, M., Duckett, R.A. and Ward, I. M., "Single and Mixed Gas Diffusion Through Polyethylene Films Polymer, 46, 2005, 4882-4890, Elsevier.
Sudhir Gupta., "Test Result of Fabric Sample", ADRDE/TechAero/Airship, 24 December 2001.
Kang Wanggu, Suh Youngwook, Woo Kyeongsik and Lee In., "Mechanical Property Characterization of Film-Fabric Laminate for Stratospheric Airship Envelope", Composite Structures 75, 2006, 151-155, Elsevier.
McDaniels Keith., Downs, R.J., Meldner Heiner., Beach Cameron and Adams Chris., "High Strengthto- Weight Ratio Non-Woven Technical Fabrics for Aerospace Applications", Cubic Tech Corp., Mesa, Arizona.