Envelope Protection for In-Flight Ice Contamination

Gingras, David R.; Barnhart, Billy; Ranaudo, Richard J.; Ratvasky, Thomas P.; Morelli, Eugene A.

doi:10.2514/6.2009-1458

Cited by 41 publications

(27 citation statements)

References 7 publications

(2 reference statements)

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“…The fact that the inputs are optimized for minimum perturbation amplitudes and maximum input energy make them applicable to practical problems where exciting aircraft dynamic response excessively would disturb the pilot or passengers. Initial investigations of this approach have already begun, with the development of an onboard envelope protection system for a commuter aircraft in icing conditions [7][8][9] , and work studying the minimum necessary excitation for accurate stability and control parameter estimation in real time 6 . American Institute of Aeronautics and Astronautics …”

Section: Discussionmentioning

confidence: 99%

“…Some of the problems that can be addressed are: multi-axis stability and control flight testing in off-nominal conditions such as high sideslip angles, near stall and departure, in post-stall flight, and during recovery from stalls and departures; multi-axis aerodynamic modeling over large portions of the flight envelope with a single maneuver; real-time monitoring of aircraft stability and control; efficient flight envelope expansion; and simultaneously estimating control effectiveness for a large number of individual control surfaces. The input design technique has been applied successfully to hypersonic stability and control flight testing 4,5 , real-time dynamic modeling for experimental fighter aircraft and subscale aircraft 2,6 , and as part of an envelope protection system for a commuter aircraft in icing conditions [7][8][9] . In this paper, novel maneuvers for efficient stability and control flight testing are described and demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Flight Test Maneuvers for Efficient Aerodynamic Modeling

Morelli

2012

Journal of Aircraft

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Novel flight test maneuvers for efficient aerodynamic modeling were developed and demonstrated in flight. Orthogonal optimized multi-sine inputs were applied to aircraft control surfaces to excite aircraft dynamic response in all six degrees of freedom simultaneously, while keeping the aircraft close to chosen reference flight conditions. Each maneuver was designed for a specific modeling task that cannot be adequately or efficiently accomplished using conventional flight test maneuvers. Each maneuver is described and explained, then demonstrated on a subscale jet transport aircraft in flight. Real-time and post-flight modeling results from equation-error parameter estimation in the frequency domain were used to show the effectiveness and efficiency of the maneuvers, as well as the quality of the aerodynamic models that can be identified from the resultant flight data. Nomenclature

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flight Test Maneuvers for Efficient Aerodynamic Modeling

Morelli

2012

Journal of Aircraft

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“…Gingras at the 2009 Aerospace Sciences Conference in Orlando, Florida (Ref. 14). As indicated in the diagram the system is heavily dependent on input from two components: The Dynamic Inversion Control Evaluation System (D-ICES), an algorithm that provides predictions of clean and iced aircraft flight characteristics, and a real-time parameter identification routine.…”

Section: Icepro Conceptmentioning

confidence: 99%

Development and Implementation of a Model-Driven Envelope Protection System for In-Flight Ice Contamination

Gingras

Barnhart

Ranaudo

et al. 2010

AIAA Guidance, Navigation, and Control Conference

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“…The authors of [12] are estimating degraded aircraft's performance and pilot handling quality as a part of Icing Contamination Envelope Protection System. Most used parameter estimation methods are: regression analysis (least squares method, LSMortotal least squares method, TLSM) and maximum likelihood method (MLE) [14,17,19].…”

Section: Parametric Aircraft Modelmentioning

confidence: 99%

Aircraft performance monitoring from flight data

2015

Teh. vjesn.

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Preliminary notesTo ensure timely maintenance and efficient aircraft operations, it is necessary to know and keep track of aircraft's actual performance. Flight performance is determined by aircraft's physical characteristics. Theoretical aircraft performance, obtained after manufacturing and flight testing, are described in flight manual. Transport aircraft in operation is usually exposed to standard operational conditions. Despite the standard operational conditions and regular aircraft maintenance, structure aging and high dynamic loads due to high subsonic Mach number could lead to changes of main physical factors that determine flight performance. For this reason actual aircraft performance often differs from theoretical. Commercial airlines monitor true performance of aircraft in operation. This paper presents an overview of existing performance monitoring methods as well as first indications for new research possibilities regarding physical characteristics determination for aircraft in operation using flight data. Keywords: aerodynamic coefficients; flight performance; flight testing; system identification Praćenje stvarnih performansi zrakoplova prema podacima iz letaPrethodno priopćenje Poznavanje stvarnih performansi zrakoplova bitno je za učinkovitu eksploataciju i pravovremeno održavanje. Performanse su određene fizikalnim karakteristikama zrakoplova. U Priručniku za letenje opisane su teorijske performanse određene od proizvođača nakon proizvodnje zrakoplova i testiranja u letu. Komercijalni zrakoplovi su tijekom svog operativnog ciklusa uglavnom izloženi predviđenim uvjetima eksploatacije. Unatoč predviđenim uvjetima eksploatacije i redovnom održavanju, starenje materijala i velika opterećenja na strukturu zrakoplova kod leta visokim podzvučnim Machovim brojem, mogu dovesti do promjene temeljnih fizikalnih faktora koji određuju performanse. Zbog toga se stvarne performanse zrakoplova nerijetko razlikuju od teorijskih. Zračni prijevoznici prate stanje zrakoplova i njegove stvarne performanse tijekom korištenja. U ovom radu prikazan je pregled dosadašnjih metoda praćenja performansi i mogućnosti istraživanja na području određivanja fizikalnih parametara zrakoplova u eksploataciji prema podacima iz leta.Ključne riječi: aerodinamički koeficijenti; identifikacija sustava; ispitivanje u letu; performanse leta

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Envelope Protection for In-Flight Ice Contamination

Cited by 41 publications

References 7 publications

Flight Test Maneuvers for Efficient Aerodynamic Modeling

Flight Test Maneuvers for Efficient Aerodynamic Modeling

Development and Implementation of a Model-Driven Envelope Protection System for In-Flight Ice Contamination

Aircraft performance monitoring from flight data

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