Loss-of-Control: Perspectives on Flight Dynamics and                                                         Control of Impaired Aircraft

Kwatny, Harry G.; Dongmo, Jean-Etienne; Allen, R. C.; Chang, B.C.; Bajpai, Gaurav

doi:10.2514/6.2010-8005

Cited by 13 publications

(7 citation statements)

References 29 publications

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“…Analytical methods and software tools have been developed for nonlinear region of attraction analysis, 8 uncertainty quantification and stochastic robustness analysis of nonlinear systems, 9 and nonlinear dynamics and control analysis. 10 The region of attraction for a nonlinear system provides an indication of the region of stability around an equilibrium point. For a nonlinear closed-loop system, this can be thought of as a measure of local robustness about a trim condition.…”

Section: A Advanced Analysis Methodsmentioning

confidence: 99%

Validation of Safety-Critical Systems for Aircraft Loss-of-Control Prevention and Recovery

Belcastro

2012

AIAA Guidance, Navigation, and Control Conference

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Validation of technologies developed for loss of control (LOC) prevention and recovery poses significant challenges. Aircraft LOC can result from a wide spectrum of hazards, often occurring in combination, which cannot be fully replicated during evaluation. Technologies developed for LOC prevention and recovery must therefore be effective under a wide variety of hazardous and uncertain conditions, and the validation framework must provide some measure of assurance that the new vehicle safety technologies do no harm (i.e., that they themselves do not introduce new safety risks). This paper summarizes a proposed validation framework for safety-critical systems, provides an overview of validation methods and tools developed by NASA to date within the Vehicle Systems Safety Project, and develops a preliminary set of test scenarios for the validation of technologies for LOC prevention and recovery.

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Section: A Advanced Analysis Methodsmentioning

confidence: 99%

Validation of Safety-Critical Systems for Aircraft Loss-of-Control Prevention and Recovery

Belcastro

2012

AIAA Guidance, Navigation, and Control Conference

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“…Another method used is the re-definition of the flight envelope protection system that would help maintain the flight vehicle within the nominal operating range [8], [9]. Similar to [7], these techniques also require the definition of the aircraft's system behaviours, pilot model or the aircraft aerodynamics, defined prior to system deployment.…”

Section: A Differentiating the Ahms-iif And Other Situational Awarenmentioning

confidence: 99%

Safer Flying Using an Immune-Inspired Adaptive Health Monitoring System

Mokhtar

Howe

2013

2013 IEEE International Conference on Systems, Man, and Cybernetics

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An adaptive health monitoring system or AHMS was developed to improve or add situational awareness to an aircraft; former is for the manned aircraft, and latter is for the unmanned aerial system (UAS). The AHMS provides situational awareness by characterising a notion of health to the aircraft, and uses this health value to perform error detection and error compensation. The notion of health is created by correlating sensors and controller outputs available to the AHMS during flight; and the AHMS does so using an immune-inspired framework (IIF). This creates the AHMS-IIF. This paper presents the results of implementation of the AHMS-IIF on a simple aircraft: the glider system, to see if the AHMS-IIF can provide the situational awareness, which can also increase the endurance of this simple system. The paper shows the AHMS-IIF has provided safer flight outcomes for the glider system. This is judged by the longer duration of flights and higher number of safe landings for the glider, when the glider is flown with the help of the AHMS-IIF at a suitable sampling and accommodation rate. Furthermore, the presented AHMS-IIF is able to achieve its objectives without prior training and optimization of the algorithms, differentiating this framework against other vehicle health management system.

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“…The resultant trim curve is used for bifurcation analysis subsequently to investigate the change of the aircraft's characteristic as the variation of a control surface deflection. Straight and level flight were studied under different V and e δ in [16]; Kwatny [17] has expended the research to coordinated turns, and the computational result was still projected to the plane of / ( ) e T V δ . However, it is no longer applicable in evaluating the attainable equilibrium sets since the continuation curve with respect to a control variable is not consistent with the envelope representation described in the previous section.…”

Section: Computational Proceduresmentioning

confidence: 99%

Steady maneuver envelope evaluation for aircraft with control surface failures

Yang

Gongzhang

2012

2012 IEEE Aerospace Conference

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A critical prerequisite of researches in the field of fault-tolerant flight control and planning is flight envelope evaluation. In order to be in compliance with path planning or trajectory generation under abnormal conditions, steady maneuver envelope is defined and evaluated. This envelope provides a complete set of equilibrium flight states under a given set of control and state limits awkward. We propose a numerical procedure using continuation technique to directly compute the boundary of the envelope, instead of trimming every flight on a grid of state and maneuver parameter points. The advantage of this approach is that it eliminates the time spent in the calculation of disequilibrium points and thus save the overall cost of evaluation. We present its application to several situations involving stuck aileron and rudder in this paper. In comparison with nominal condition, the size of the envelope decreases and the shape changes, owing to the saturation of corresponding key control variables. The open-loop stable region also shrinks as a consequence.

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Loss-of-Control: Perspectives on Flight Dynamics and Control of Impaired Aircraft

Cited by 13 publications

References 29 publications

Validation of Safety-Critical Systems for Aircraft Loss-of-Control Prevention and Recovery

Validation of Safety-Critical Systems for Aircraft Loss-of-Control Prevention and Recovery

Safer Flying Using an Immune-Inspired Adaptive Health Monitoring System

Steady maneuver envelope evaluation for aircraft with control surface failures

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