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oai:www.ideals.illinois.edu:2142/80862 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Basar, Tamer Melody, James William 2015-09-25T20:08:32Z 2015-09-25T20:08:32Z 10000-01-01 2004 2004 This thesis advances the development of the Ice Management System (IMS), which has been previously proposed as an additional layer of safety against aircraft icing accidents, by presenting and validating a conceptual design for the icing characterization function of the IMS. This icing characterization function seeks to provide a near real-time estimate of the degradation of the aircraft flight dynamics due to icing. The icing characterization is extracted from various information sources comprising Hinfinity parameter identification of the flight dynamics, steady-state characterization of the aircraft trim, aerodynamic hinge moment sensing, and an estimate of the flight-dynamics excitation. Two aspects of the icing characterization are novel: (i) real-time Hinfinity parameter identification of the flight dynamics, and (ii) preprocessing and assimilation of the various measurements that individually provide partial information on the icing degradation into a single comprehensive icing characterization, the so-called sensor fusion function. These two aspects of the icing characterization are validated by applying them in computer simulation to a rich set of flight scenarios. Moreover, the Hinfinity parameter identification is applied successfully to flight-test data generated by the NASA Twin Otter icing research aircraft, and validated against an existing flight-dynamics identification technique. Finally, consideration of an independent icing degradation estimate from atmospheric and photographic measurements demonstrates that the H infinity parameter estimate provides an indication of icing degradation for a natural-icing flight test. Made available in DSpace on 2015-09-25T20:08:32Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3130980.pdf: 12751157 bytes, checksum: e1d5b10c4ba877aea766c7a83105e12c (MD5) Previous issue date: 2004 Embargo set by: Seth Robbins for item 82144 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 209 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004. http://hdl.handle.net/2142/80862 (MiAaPQ)AAI3130980 eng Engineering, Aerospace Inflight Characterization of Aircraft Icing text Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.