Change search
CiteExportLink to record
Permanent link

Direct link
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
Dynamic Performance Analysis of a Fighter Jet with Nonlinear Dynamic Inversion
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Flight Dynamics.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Dynamisk prestandaanalysav stridsflygplan med NDI (Swedish)
Abstract [en]

A modern view of aircraft performance analysis, is to quantify aircraft manoeuvrability with agility metrics. There are several different agility metrics, which can be seen as indexing of the aircraft agility performance. The quantified unit is the time it takes for the aircraft to perform a specific manoeuvre relevant to a given agility metric. In this thesis, estimations are done of two agility metrics, the CCT (Combat Cycle Time) and the T90 (Time to capture 90◦ bank angle) for the F-18 HARV aircraft.Estimations of the agility metrics were obtained by simulating a six-degree-of-freedom aircraft model of the F-18 HARV aircraft performing the specific manoeuvres. To control the aircraft model during the simulation a control sys-tem was developed based on the NDI (Nonlinear Dynamic Inversion) method with time scale separation assumption. The method uses the feedback from the controlsystem for linearizing the aircraft system, which results in that simple linear controllers can be applied to the nonlinear aircraft model.In this case simple proportional controllers were implemented and in the case of estimating the T90 agility metric additional gain scheduling as functions of altitude and Mach number was required to extract maximum performance. Although the control system was developed for these two specific agility metrics, results indicates that the NDI method provides an effective way to implement controllers for complex systems, especially when considering a high nonlinear flight regime.

Place, publisher, year, edition, pages
2019. , p. 46
Series
TRITA-SCI-GRU ; 2019:297
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262009OAI: oai:DiVA.org:kth-262009DiVA, id: diva2:1360247
External cooperation
FOI
Examiners
Available from: 2019-10-11 Created: 2019-10-11 Last updated: 2019-10-11Bibliographically approved

Open Access in DiVA

fulltext(1205 kB)13 downloads
File information
File name FULLTEXT01.pdfFile size 1205 kBChecksum SHA-512
5f99e8ddcabf6876519d074c5393b9a6afbfd0b1ae40ddd88c6cc9ffb907b8c33a729426f67473090c2cf88113b8f717fa30df79506cab53c676b6e581666631
Type fulltextMimetype application/pdf

By organisation
Flight Dynamics
Aerospace Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 13 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 69 hits
CiteExportLink to record
Permanent link

Direct link
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