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Development of a System Identification Tool for Subscale Flight Testing
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Aircraft system identification has been widely used to this day in applications like control law design, building simulators or extending flight envelopes. It can also be utilized for determining flight-mechanical characteristics in the preliminary design phase of a flight vehicle. In this thesis, three common time-domain methods were implemented in MATLAB for determining the aerodynamic derivatives of a subscale aircraft. For parameter estimation, the equation-error method is quick, robust and can provide good parameter estimates on its own. The output-error method is computationally intensive but keeps account of the aircraft's evolution in time, being more suitable for fine-tuning predictive models. A new model structure is identified using multivariate orthogonal functions with a predicted squared error stopping criteria. This method is based on linear regression (equation-error).

The code written is flexible and can also be used for other aircraft and with other aerodynamic models. Simulations are compared with experimental data from a previous flight test campaign for validation. In the future, this tool may help taking decisions in conceptual design after a prototype is tested.

Place, publisher, year, edition, pages
2019. , p. 51
Keywords [en]
GFF, Generic Future Fighter, system identification, orthogonal function modeling, equation error method, output error method, aerodynamic derivatives, flight dynamics, flight testing
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:liu:diva-157292ISRN: LIU-IEI-TEK-A--19/03381—SEOAI: oai:DiVA.org:liu-157292DiVA, id: diva2:1324418
Subject / course
Aeronautical Engineering
Supervisors
Examiners
Available from: 2019-06-18 Created: 2019-06-13 Last updated: 2019-06-18Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • 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