Reducing emissions using aircraft trajectory optimization
(English)In: Aerospace Science and Technology, ISSN 1270-9638, E-ISSN 1626-3219Article in journal (Other academic) Submitted
Optimal aircraft trajectories reducing engine emissions are computed using numerical optimization. The emissions from the jet engine are modeled as functions of the aircraft altitude, airspeed and throttle setting. Combining the emission models with a performance model of the aircraft, the optimization problem is formulated with the objective of reducing emissions for a given distance flight. The resulting problem, involving a system of differential and algebraic equations, is discretized using collocation and the optimization problem is solved using sequential quadratic programming. Different objectives are investigated, such as minimizing the total emissions of carbon dioxide, carbon monoxide, oxides of nitrogen and hydrocarbons during a flight. Methods from life cycle impact assessment are used to weigh the different emissions to an index and several different indices are used and compared. A model of the Boeing 737-600 is used to illustrate the developed optimization method. The results show that the trajectories differ significantly depending on the chosen objective. Using a combination of objectives at different altitudes may give the most appropriate problem formulation.
Trajectory optimization, Boeing fuel flow method, Emissions index
IdentifiersURN: urn:nbn:se:kth:diva-10955OAI: oai:DiVA.org:kth-10955DiVA: diva2:233073
QS 201203272009-08-272009-08-272012-03-27Bibliographically approved