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

Flight Test Maneuvers for Efficient Aerodynamic Modeling

“…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 …”

“…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.…”

Integrated Immunity-Based Framework for Aircraft Abnormal Conditions Management

“…Several research efforts have been conducted in the past few years on the design of fault-tolerant adaptive control laws [5,9,10] and the development of envelope estimation and protection methodologies for aircraft under damage/failure conditions [11][12][13][14][15][16][17]. These efforts provided promising solutions to several isolated specific problems; however, they considered only a reduced number of aircraft dynamic parameters and addressed the abnormal condition evaluation process or envelope estimation in a limited manner mostly outside the general context, which also includes abnormal condition detection, identification, and accommodation.…”

Upset Dynamics of an Airliner Model: A Nonlinear Bifurcation Analysis

“…This can induce a loss of control event, currently the leading cause of commercial aviation fatalities [2], if the pilot's actions are not effective to recover the upset condition. The activity receiving most attention in attempting to reduce upset events is improved pilot training [3]; other initiatives include fully protected aircraft [4], prediction of upset to improve pilot awareness [5], and automation (from assisted [4] to fully automated [6]) to allow for easier recovery. Whichever solution is being studied, it is important to understand the fundamental aircraft behaviour in these highly nonlinear flight regimes.…”