Design and Preliminary Evaluation of a Segment-Based Routing Methodology

Vormer, F.J.; Mulder, Max; Paassen, M. M. van; Mulder, J.A.

doi:10.2514/6.2002-4861

Cited by 11 publications

(3 citation statements)

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“…Pilot-preferred commercial and GA flight plans are typically defined by a sequence of waypoints connected by constant-trim segments and transitions between these trim states. Such segmented routes 28 enable intuitive comprehension by pilots and ATC, facilitate communication of the trajectory, and can reduce computational complexity relative to numerical optimization processes. A goal of this research is to provide a trajectory synthesis tool to use when a piloted or unmanned aircraft suffers a decrease in performance.…”

Section: Related Workmentioning

confidence: 99%

“…The trajectory planner constructs a valid postfailure waypoint sequence that can be safely followed to the landing runway. As just discussed, we generate segmented trajectories 28 that are intuitive for pilots/ATC but need not be optimized at additional computational cost because the overriding goal is a safe landing. [The cost function for a loss-of-thrust trajectory is not intuitively defined because fuel use is necessarily zero, and it might be unwise to minimize or maximize time aloft because resulting trajectories might be close to flight envelope boundaries.…”

Section: Segmented Trajectory Generation For Total Loss Of Thrustmentioning

confidence: 99%

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Emergency Flight Planning Applied to Total Loss of Thrust

Atkins

Portillo

Strube

2006

Journal of Aircraft

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Autopilot systems are capable of reliably following flight plans under normal circumstances, but even the most advanced flight-management systems cannot provide robust response to most anomalous events including in-flight failures. This paper describes an emergency flight-management architecture that can be applied to piloted or autonomous aircraft, with focus on the design and implementation of an adaptive flight planner (AFP) that dynamically adjusts its model to compute feasible flight plans in response to events that degrade aircraft performance. A two-step landing-site selection/trajectory generation process defines safe emergency plans in real time for situations that require landing at an alternate airport. A constraint-based search algorithm selects and prioritizes feasible emergency landing sites, then the AFP synthesizes a segmented trajectory to the best site based on postfailure flight dynamics. The AFP architecture is general for any failure situation; however, operational success is guaranteed only with accurate postfailure performance characterization and a trajectory generation strategy that respects degraded flight envelope boundaries. A real-time segmented trajectory planning algorithm and case study results are presented for total loss of thrust failure scenarios. This emergency is surprisingly common and necessitates an immediate approach and landing without a go-around option.

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Section: Related Workmentioning

confidence: 99%

Section: Segmented Trajectory Generation For Total Loss Of Thrustmentioning

confidence: 99%

Emergency Flight Planning Applied to Total Loss of Thrust

Atkins

Portillo

Strube

2006

Journal of Aircraft

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show abstract

“…23 While the trajectories generated by these approaches are appropriate for autonomous UAVs given performance constraints are met, commercial and general aviation pilots prefer flight plans specified as a sequence of constant-trim flights and transitions between these trim states because segmented routes can be comprehended intuitively by human pilots and air traffic controllers. 24 An example of this concept applied to trajectory planning is the maneuver automaton. 25 This work applies a similar approach to segmented trajectory planning through the use of hybrid trim-trajectory motion primitives, extending previous work 9 that focused on control surface jam failures in an F-16 aircraft.…”

Section: Introductionmentioning

confidence: 99%

Emergency Flight Planning for a Generalized Transport Aircraft with Left Wing Damage

Tang

Atkins

Sanner

2007

AIAA Guidance, Navigation and Control Conference and Exhibit

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Flight management systems are highly capable in nominal conditions but are unable to manage most emergency situations, particularly when the performance envelope is degraded due to damage or component failures. Emerging adaptive control and system identification technologies can maintain stable flight given reduced performance, but the pilot must assume the responsibility of guiding the disabled aircraft to a safe landing. With a highly restricted envelope, the family of feasible trajectories may be so unintuitive that a pilot may not be capable of identifying a safe landing flight plan given current high-level automation aids. This paper presents an adaptive flight planner to build landing trajectories for disabled aircraft. A case study is investigated in which a Generalized Transport Model aircraft must land following the loss of a significant fraction of its left wing. Trimmed (non-accelerating) flight conditions define the post-damage flight envelope. Nearby landing runways are prioritized and segmented trajectories to the top-priority sites are defined by trim state and transition sequences. An LQRbased PID controller enables the damaged GTM aircraft to correctly track trajectory commands over trimmed flight and transition segments. A suite of initial conditions are presented to evaluate flight planner performance.

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Noise-Minimum Runway-Independent Aircraft Approach Design for Baltimore-Washington International Airport

Xue

Atkins

2006

Journal of Aircraft

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Design and Preliminary Evaluation of a Segment-Based Routing Methodology

Cited by 11 publications

References 0 publications

Emergency Flight Planning Applied to Total Loss of Thrust

Emergency Flight Planning Applied to Total Loss of Thrust

Emergency Flight Planning for a Generalized Transport Aircraft with Left Wing Damage

Noise-Minimum Runway-Independent Aircraft Approach Design for Baltimore-Washington International Airport

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