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Sökning: onr:09546vr0x63qhzmt > Flight test system ...

  • Larsson, Roger,1968- (författare)

Flight test system identification / Roger Larsson.

  • E-bokAvhandlingEngelska2019

Förlag, utgivningsår, omfång ...

  • Publicerad:Linköping :Publicerad:Linköping University, Department of Electrical Engineering,Publicerad:2019
  • 1 onlineresurs (xv, 301 sidor)
  • texttxtrdacontent
  • computercrdamedia
  • online resourcecrrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:09546vr0x63qhzmt
  • Ogiltigt nummer / annan version:9789176850701 (print)
  • http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156694uri
  • urn:nbn:se:liu:diva-156694urn
  • 10.3384/diss.diva-156694doi

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:svenska

Ingår i deldatabas

Klassifikation

Serie

  • Linköping studies in science and technology. Dissertations,0345-7524 ;1990

Anmärkningar

  • Teknologie doktorsexamen
  • Ph.D. (engineering)
  • Diss. Linköping : Linköpings universitet, 2019
  • gratis
  • With the demand for more advanced fighter aircraft, relying on unstable flight mechanical characteristics to gain flight performance, more focus has been put on model-based system engineering to help with the design work. The flight control system design is one important part that relies on this modeling. Therefore, it has become more important to develop flight mechanical models that are highly accurate in the whole flight envelope. For today’s modern fighter aircraft, the basic flight mechanical characteristics change between linear and nonlinear as well as stable and unstable as an effect of the desired capability of advanced maneuvering at subsonic, transonic and supersonic speeds. This thesis combines the subject of system identification, which is the art of building mathematical models of dynamical systems based on measurements, with aeronautical engineering in order to find methods for identifying flight mechanical characteristics. Here, some challenging aeronautical identification problems, estimating model parameters from flight-testing, are treated. Two aspects are considered. The first is online identification during flight-testing with the intent to aid the engineers in the analysis process when looking at the flight mechanical characteristics. This will also ensure that enough information is available in the resulting test data for post-flight analysis. Here, a frequency domain method is used. An existing method has been developed further by including an Instrumental Variable approach to take care of noisy data including atmospheric turbulence and by a sensor-fusion step to handle varying excitation during an experiment. The method treats linear systems that can be both stable and unstable working under feedback control. An experiment has been performed on a radio-controlled demonstrator aircraft. For this, multisine input signals have been designed and the results show that it is possible to perform more time-efficient flight-testing compared with standard input signals. The other aspect is post-flight identification of nonlinear characteristics. Here the properties of a parameterized observer approach, using a prediction-error method, are investigated. This approach is compared with four other methods for some test cases. It is shown that this parameterized observer approach is the most robust one with respect to noise disturbances and initial offsets. Another attractive property is that no user parameters have to be tuned by the engineers in order to get the best performance. All methods in this thesis have been validated on simulated data where the system is known, and have also been tested on real flight test data. Both of the investigated approaches show promising results.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Enqvist, Martin,1976- (preses)
  • Ljung, Lennart,1946- (preses)
  • Smith, Roy (opponent)
  • Linköpings universitet.Institutionen för systemteknik (utgivare)
  • Linköpings universitetTekniska fakulteten (utgivare)

Sammanhörande titlar

  • Del av/supplement till:channel record
  • Annan version:Flight test system identification9789176850701

Seriebiuppslag

  • Linköping studies in science and technology. Dissertations,0345-7524 ;1990

Internetlänk

Länkade data-URI:er (test)

  • https://libris.kb.se/t40j8x0krq9nlv1l#it (Larsson, Roger, 1968- aut)
  • https://id.kb.se/term/sao/Flygteknik (Flygteknik sao)
  • https://id.kb.se/term/sao/Matematiska%20modeller (Matematiska modeller sao)
  • https://libris.kb.se/mkz13kq51s7g54n#it (Enqvist, Martin, 1976- ths)
  • https://libris.kb.se/97mqxh2t3qsd62h#it (Ljung, Lennart, 1946- ths)
  • https://libris.kb.se/rp358tm95d99njg#it (Linköpings universitet. Institutionen för systemteknik pbl)
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