COSMA — WP5
Optimization of airport noise scenarios

What is going on

Task 1

All activities completed.

Task 2

All activities completed.

Task 3

The final deliverable on the design and procedural recommendations is currently under preparation and will be available at M45. The deliverable will interpret the results obtained from the multi-objective optimizations according to the feedback reported in the WP2’s deliverables. The definition of the design and operative guidances will be performed using two approaches in parallel. First, the engineering significance of the most annoying noise features will be analyzed directly, resulting in a tentative ranking of the available new technologies with respect to annoyance alleviation. In parallel, the Pareto fronts obtained in all the relevant optimizations will be explored, in order to identify the non-dominated solutions complying (to some extent) to the WP2 recommendations. This second approach represents a preliminary work finalized at the development of a robust and reliable decision-making algorithm based on annoyance assessment.

The multi-event, multiple runways optimization started

Expected results by: November 2010

The preliminary work in preparation of the multi-event, multiple runways optimization started at month 1 with the definition of data set to be provided to WP3 for the synthesis of related sounds. In addition, the adaptation of the computational tools to be used for the expensive optimizations expected is in progress, in order to reduce the computational burden and fully exploit the computing facilities.

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Results achieved so far

November 2010

  • The first set of preliminary sequence sounds are currently been produced using recordings and target sounds generated in SEFA. To do this, an aircraft substitution table has been produced to match the operating fleet with the data available in the SEFA database. These preliminary sequences will be used only for the WP2 pre-tests.
  • A specific computer tool to easily generate the desired sequence from a set of available single-event sounds has been produced and released to the consortium. The tool is designed to easily generate the sound files, the peaks profiles, and the sound level profiles using only public domain software.
  • Low-noise optimized procedure and the associated sound spectra at the observation points have been produced, and provided to WP3 partners for sound files synthesis. The resulting sound files will be the basis for the generation of the Scenario 3 sequences.
  • The optimization algorithm to be used for scenarios S4 and S5 has been defined.

December 2012

The optimizations of the airport scenarios for current and future technologies have been completed. The optimizations include the possibility of multiple simultaneous event operating on the same airport, taking into account all the constraints related to the time and space separation between the aircraft during the whole procedure.

  • The operational conditions relative to all the simulated scenarios have been provided to WP3 for the synthesis of the corresponding sound signals at the observation point.
  • An activity in support of WP3 for the modeling of some of the most relevant engine noise sources has been completed.
  • The effect of low-noise technologies and innovative concepts has been estimated. To this aim, a link to the OPENAIR Level 1 project has been officially established.
  • A final set of multi-objective optimizations has been completed using two different algorithmic approaches. The two objectives have been chosen as the area bounded by one of the relevant SEL isophonic and the total fuel burned during the maneuver. The primary aim of the multi-objective optimizations is the preliminary assessment of the potential effect on the community noise annoyance of the trade-off between noise and greenhouse gases emissions.

Objectives

WP5 is aimed at two different but complementary objectives: the optimization of an airport scenarios with respect to community annoyance, and the definition of the design criteria and operative recommendations to be introduced in order identify a potential roadmap to eventually achieve, in the real world, the optimal solution found. The variable space where the optimization is carried on includes flight procedures variables as well as relevant aircraft design parameters. The foreseen evolution of the technology framework will be consider by including in the analysis the expected benefits due to the implementation of the low-noise technologies developed within the research projects of the X-Noise network. The technological and operative optimal scenarios developed in WP5 will be used to synthesize sounds to b used in the WP2 test campaign. The feedback coming from the listening tests will be the basis for the definition of the design recommendations and the assessment of noise abatement procedures with respect to annoyance.

Description of work

The WP5 activity is divided into two optimization tasks, plus a final task aimed at the formulation of the design criteria. In the first optimization task, the attention is focused on a simple test case, where a sequence of singe events (take-off and landing) takes place on a single reference runway (Fig. 1). The sequence of events are defined according to the traffic data of a reference international airport, and optimized with respect to different merit factors, while keeping the number of passengers unchanged. The second optimization task aims at the analysis of a complete airport scenario, with multiple runways and multiple events operating simultaneously. During this second phase, the effect of low-noise Technologies and innovative concepts will be taken into account. Finally, the last task will produce a set of design criteria and recommendations to assess and rank the technological and management solutions in terms of community annoyance. The structure of COSMA and the relevance of the WP5 activity from the engineering point of view require a deep interaction of WP5 with the other work packages.

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