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Sensitivity Analysis for Ascending Zero Pressure Balloons
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This work analysed the sensitivity in ascending velocity for three different zero pressure balloons of different sizes. A program that considers the atmospheric and thermodynamic conditions was written to try and simulate the balloons ascent throughout the atmosphere. The sensitivity for ascending velocity was determined with the Monte-Carlo method and measuring the mean vertical velocity throughout the atmosphere. The performance of the simulated flight when compared to its real flight, was accurate in the troposphere and then started to deviate in the stratosphere. Whether the drag is underestimated or overestimated during the stratosphere would depend on the size of the balloon and when it is released. Changing the free lift for the balloons showed that small balloons have almost the same sensitivity in the troposphere as in the stratosphere, while a larger balloon could be more sensitive in either part, depending on the time it is launched. With a changing ground temperature, the balloons with less cloud cover would be more sensitive in the stratosphere. Balloons flying during hours with sunlight are less sensitive to a changing cloud cover than balloons that fly with little to no sunlight, but some more data should be analysed for a proper conclusion. Larger balloons are more sensitive with a changing ground albedo value compared to smaller balloons.

Place, publisher, year, edition, pages
2019. , p. 54
Keywords [en]
Zero-pressure balloons, sensitivity analysis, ascent
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-72479OAI: oai:DiVA.org:ltu-72479DiVA, id: diva2:1276979
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Examiners
Available from: 2019-01-10 Created: 2019-01-09 Last updated: 2019-01-10Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf