Performance comparison of guidance strategies to accomplish RTAs during a CDO

Dalmau, Ramon; Prats, Xavier; Verhoeven, Ronald; Bussink, Frank; Heesbeen, Bart

doi:10.1109/dasc.2017.8102096

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…This method is commonly referred as sensitivity-based NMPC (SbNMPC). Algorithm (2) shows the main steps of SbNMPC, where τ opt and τ inf s are the pre-defined tolerances for the optimality and feasibility criteria, respectively. Algorithm 2 Sensitivity-based NMPC (SbNMPC)…”

Section: Nmpc Guidance Strategiesmentioning

confidence: 99%

“…In previous work [2], the performance of various guidance strategies in the time and energy managed operations (TEMO) concept [3] were compared using a high-fidelity flight simulator, in particular environmental impact mitigation and the ability to meet operational constraints. Several descents subject to CTAs were simulated including errors in the parameters of the weather and aircraft performance models used by the FMS.…”

Section: Introductionmentioning

confidence: 99%

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Fast sensitivity-based optimal trajectory updates for descent operations subject to time constraints

Dalmau

Prats

Baxley

2018

2018 IEEE/AIAA 37th Digital Avionics Systems Conference (DASC)

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The ability to meet a controlled time of arrival while also flying a continuous descent operation will enable environmentally friendly and fuel efficient descent operations while simultaneously maintaining airport throughput. Previous work showed that guidance strategies based on a frequent recalculation of the optimal trajectory during the descent result in excellent environmental impact mitigation figures while meeting operational constraints in the presence of modelling errors. However, the time lag of recalculating the trajectory using traditional optimisation algorithms could lead to performance degradation and stability issues. This paper proposes an alternative strategy, which allows for fast updates of the optimal trajectory based on parametric sensitivities. Promising results show that the performance of this method is comparable to that of instantaneously recalculating the optimal descent trajectory at each time sample.

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Section: Nmpc Guidance Strategiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast sensitivity-based optimal trajectory updates for descent operations subject to time constraints

Dalmau

Prats

Baxley

2018

2018 IEEE/AIAA 37th Digital Avionics Systems Conference (DASC)

Self Cite

View full text Add to dashboard Cite

show abstract

“…In our previous work [4], the performance of various guidance strategies in the time and energy managed operations concept [5] were compared using a high-fidelity fast-time flight simulator, focusing on the environmental impact mitigation and the ability to meet operational constraints. Numerous descents subject to CTAs were simulated, with errors introduced in the parameters of the weather and aircraft performance models used by the trajectory planning function of the FMS.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity-Based Non-Linear Model Predictive Control for Aircraft Descent Operations Subject to Time Constraints

2021

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The ability to meet a controlled time of arrival while also flying a continuous descent operation will enable environmentally friendly and fuel efficient descent operations while simultaneously maintaining airport throughput. Previous work showed that model predictive control, a guidance strategy based on a reiterated update of the optimal trajectory during the descent, provides excellent environmental impact mitigation figures while meeting operational constraints in the presence of modeling errors. Despite that, the computational delay associated with the solution of the trajectory optimization problem could lead to performance degradation and stability issues. This paper proposes two guidance strategies based on the theory of neighboring extremals that alleviate this problem. Parametric sensitivities are obtained by linearization of the necessary conditions of optimality along the active optimal trajectory plan to rapidly update it for small perturbations, effectively converting the complex and time consuming non-linear programming problem into a manageable quadratic programming problem. Promising results, derived from more than 4000 simulations, show that the performance of this method is comparable to that of instantaneously recalculating the optimal trajectory at each time sample.

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Controlled time of arrival windows for already initiated energy-neutral continuous descent operations

Dalmau

Prats

2017

Transportation Research Part C: Emerging Technologies

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Continuous descent operations with controlled times of arrival at one or several metering fixes could enable environmentally friendly procedures without compromising terminal airspace capacity. This paper focuses on controlled time of arrival updates once the descent has been already initiated, assessing the feasible time window (and associated fuel consumption) of continuous descent operations requiring neither thrust nor speed-brake usage along the whole descent (i.e. only elevator control is used to achieve different metering times). Based on previous works, an optimal control problem is formulated and numerically solved. The earliest and latest times of arrival at the initial approach fix have been computed for the descent of an Airbus A320 under different scenarios, considering the potential altitudes and distances to go when receiving the controlled time of arrival update. The effects of the aircraft mass, initial speed, longitudinal wind and position of the initial approach fix on the time window have been also investigated. Results show that time windows about three minutes could be achieved for certain conditions, and that there is a trade-off between robustness facing controlled time of arrival updates during the descent and fuel consumption. Interestingly, minimum fuel trajectories almost correspond to those of minimum time.Peer ReviewedPostprint (published version

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Performance comparison of guidance strategies to accomplish RTAs during a CDO

Cited by 3 publications

References 17 publications

Fast sensitivity-based optimal trajectory updates for descent operations subject to time constraints

Fast sensitivity-based optimal trajectory updates for descent operations subject to time constraints

Sensitivity-Based Non-Linear Model Predictive Control for Aircraft Descent Operations Subject to Time Constraints

Controlled time of arrival windows for already initiated energy-neutral continuous descent operations

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