The Simulation and Integration of Real-Time Wake Vortex Turbulence in a Simulator Using Simulink Coder

RAeS Spring Flight Simulation Conference 2018Daniel Shinners, AXIS Flight Training Systems GmbH

AXIS

AXIS’ STANDPOINT

▸ New regulations present opportunities for new technology usage.

▸ Technology should not bring about negative training scenarios.

▸ Preparation for possible wake vortex training tasks in the future.

▸ Need to explore ways and ideas for repeatable and random UPRT training tasks.

▸ Realistic, ‘in-the-loop’ upset initiation that induces surprise and/or startle can add to robustness of pilot performance in upset recovery.

▸ Requirement: Proof of concept for flexible wake vortex turbulence module to be added to weather simulation processes.

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OBJECTIVES

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Research

Modelling

Testing/Implementation

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WAKE VORTEX TURBULENCECONCEPTS

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Phases and their respective lengths of wake vortex turbulence

A pair of rolled-up trailing vortices of separation b0

Transport and decay outputs from analytical 2-phase decay calculation methods

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WAKE VORTEX SYSTEM APPROACH

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A set of computational gates used to calculate the wake transport and decay of an arriving aircraft. An individual gate has been enlarged to show the wake details.

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WAKE VORTEX SYSTEM APPROACH

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An example of a forced wake vortex encounter with accompanying pre-defined encounter geometries

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MATLAB SIMULINK MODELLINGSECONDARY MODULES

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Atmospheric module as well as the Follower/Leader modules

Auxiliary modules used for testing and visualisation purposes

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MATLAB SIMULINK MODELLINGPRIMARY MODULES

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MODULE WAKE INITIATION

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Initial circulation strength and quasi-3D vortex/gate placement is calculated (left, blue). Discrete vortex particles are placed and calculated (left, red).

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MODULEWAKE VORTEX GATES

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An individual vortex gate (top), containing normalisation, time dependent and vortex module calculation blocks (middle). Vortex calculation modules accounting for decay and transport effects.

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SCENARIOOGE GATE

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SCENARIOOGE GATE (WIND GUSTS)

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SCENARIO NGE/IGE GATE

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MODULE ENCOUNTER

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Follower aircraft and wake tracking and positioning (red). Wake data acquisition (green). Wake data prepared for given encounter (blue).

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MODULEAIRCRAFT INTERACTION MODEL

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TESTING/RESULTS

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INTEGRATION AND SIMULINK

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Integration:

▸ Converted and Integrated successfully into weather simulation process.

▸ Initial testing on an FTD completed.

Findings on Simulink:

▸ Strong development tool.

▸ Plugin structure streamlines testing and updates.

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USE CASES

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Now:

▸ Realistic ‘in-the-loop’ upset initiator.

Future:

▸ Traffic simulation add-on.

▸ Regulation-specific wake turbulence training tasks.

▸ Additional IOS tools for wake vortex severity criterion (Roll Control Ratio, Roll Moment Coefficient, etc).

AXIS

OUTLOOK

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Short Term:

▸ Pilot and simulator testing

▸ Upset initiations via wake vortex turbulence.

Longer Term:

▸ Enhanced IGE modelling

▸ 3D wake geometries.

▸ Multiple gate scenarios and 3D gate interpolation.

▸ Expansion of modelling for possible leader aircraft-based encounter scenarios.

▸ Increasing the realism of the traffic simulation with concurrent vortex generation of traffic aircraft.

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THANK YOU