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Practical input optimization for aircraft parameter estimation experimentsThe object of this research was to develop an algorithm for the design of practical, optimal flight test inputs for aircraft parameter estimation experiments. A general, single pass technique was developed which allows global optimization of the flight test input design for parameter estimation using the principles of dynamic programming with the input forms limited to square waves only. Provision was made for practical constraints on the input, including amplitude constraints, control system dynamics, and selected input frequency range exclusions. In addition, the input design was accomplished while imposing output amplitude constraints required by model validity and considerations of safety during the flight test. The algorithm has multiple input design capability, with optional inclusion of a constraint that only one control move at a time, so that a human pilot can implement the inputs. It is shown that the technique can be used to design experiments for estimation of open loop model parameters from closed loop flight test data. The report includes a new formulation of the optimal input design problem, a description of a new approach to the solution, and a summary of the characteristics of the algorithm, followed by three example applications of the new technique which demonstrate the quality and expanded capabilities of the input designs produced by the new technique. In all cases, the new input design approach showed significant improvement over previous input design methods in terms of achievable parameter accuracies.
Document ID
19930018075
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Morelli, Eugene A. (Joint Inst. for Advancement of Flight Sciences Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1993
Subject Category
Aircraft Stability And Control
Report/Patent Number
NAS 1.26:191462
NASA-CR-191462
Accession Number
93N27264
Funding Number(s)
CONTRACT_GRANT: NCC1-29
PROJECT: RTOP 505-64-52-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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