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Analytical Volterra-based models for nonlinear low order flight dynamics approximation systems

Published online by Cambridge University Press:  27 January 2016

A. Omran  and
B. Newman
A. Omran
Affiliation:
CNH-Fiat Industrial, Burr-Ridge, Illinois, USA
B. Newman
Affiliation:
Dept of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, Virginia, USA
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Abstract

Analytical methodology is presented to conduct dynamical assembly of simple low order nonlinear responses for system synthesis and prediction using Volterra theory. The procedure is set forth generically and then applied to several atmospheric flight examples. A two-term truncated Volterra series, which is enough to capture the quadratic and bilinear nonlinearities, is developed for first and second order generalised nonlinear single degree of freedom systems. The resultant models are given in the form of first and second kernels. A parametric study of the influence of each linear and nonlinear term on kernel structures is investigated. A step input is then employed to quantify and qualify the nonlinear response characteristics. Uniaxial surge and pitch motions are presented as examples of the low order flight dynamic systems. These examples show the ability of the proposed analytical Volterra-based models to predict, understand, and analyse the nonlinear aircraft behaviour beyond that attainable by linear-based models. The proposed analytical Volterra-based model offers an efficient nonlinear preliminary design tool in qualifying the aircraft responses before computer simulation is available or invoked.

Type
Research Article
Information
The Aeronautical Journal , Volume 116 , Issue 1185 , November 2012 , pp. 1123 - 1153
Copyright
Copyright © Royal Aeronautical Society 2012 

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