Pilot-induced oscillation detection and mitigation

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dc.contributor.advisorCooke, Alastair K.
dc.contributor.advisorLone, Mudassir M.
dc.contributor.authorLiu, Qingling
dc.date.accessioned2013-07-25T09:34:13Z
dc.date.available2013-07-25T09:34:13Z
dc.date.issued2012-12
dc.description.abstractThe aim of this thesis is to develop a real time PIO detection and mitigation system that consists of a detector based on short time Fourier transform(STFT) and autoregressive model(ARX) with exogenous inputs, together with an adaptive controller based mitigation system. The system not only detects the traditional PIO characteristics but also focuses on the trend of pilot behaviour by calculating the rate of change in the open loop crossover frequency. In the detection system, a sliding windowed STFT method was applied to identify the frequency and phase characteristics of the system via processing the signal of pilot input and aircraft state. An ARX model was also applied to get the rate of change of the crossover frequency. After detection, a PIO cue was shown on the primary flight display. A scheduled gain controller was coupled to provide PIO mitigation by varying stick input gain. Compensatory and tracking tests for the evaluation of this system were performed using a quasi-linear Boeing-747 aircraft model including nonlinear command gearing and actuator rate-limiting. Bandwidth and Gibson criteria were used to design PIO prone control laws for system evaluation experiments. Results from PIO tests conducted on desktop PCs were presented. These were analyzed and compared with those obtained from implementing the Real-time Oscillation Verifier module available in literature.en_UK
dc.description.sponsorshipCommercial Aircraft Corporation of China, Ltd (COMAC)and Chinese Scholarship Council.en_UK
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/7998
dc.language.isoenen_UK
dc.publisherCranfield Universityen_UK
dc.rights© Cranfield University 2011. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright owner.en_UK
dc.subjectPilot Vehicle Systemen_UK
dc.subjectFlight Control Systemen_UK
dc.subjectPilot Induced Oscillationen_UK
dc.subjectAircraft Pilot Couplingen_UK
dc.subjectShort Time Fourier Transformen_UK
dc.subjectARX Modelen_UK
dc.subjectAdaptive Controlleren_UK
dc.subjectPilot Modellingen_UK
dc.titlePilot-induced oscillation detection and mitigationen_UK
dc.typeThesis or dissertationen_UK
dc.type.qualificationlevelMastersen_UK
dc.type.qualificationnameMSc by Researchen_UK

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