Aircraft Safety Analysis Using Generalized Polynomial Chaos

J. Diepolder, P. Piprek, B. Grüter, T. Akman, F. Holzapfel

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In this paper we investigate the application of generalized polynomial chaos (gPC) for optimal control based aircraft safety assessment with parameter uncertainties. The approach is based on the formulation of an appropriate optimal control problem to obtain worst case inputs. The criterion to be assessed is introduced in the cost function and the numerical solution is obtained using direct optimal control methods. In this context, we consider the case where the parameter distribution is unknown and assume a truncated uniform distribution with truncation values to be determined. The approach can be summarized as follows: First an optimization assisted bisection search algorithm is performed. This algorithm yields regions of a defined size in which a violation of the criterion occurs. In order to obtain a local explicit representation of the worst-case solution, we approximate this solution in the parameter space using a spectral representation based on gPC. This representation is then used to determine the worst case truncation limits of the uniform distribution and to estimate the exceedance probability for the criterion under investigation. The application is illustrated using a F-16 short period model with model reference adaptive controller. In this example, we estimate the exceedance probability for the maximum tracking error in the angle of attack for worst case reference command inputs and plant uncertainties in pitch damping, pitch stiffness, and control effectiveness.

Original languageEnglish
Title of host publicationAir Traffic Management and Systems III - Selected Papers of the 5th ENRI International Workshop on ATM/CNS, EIWAC 2017
EditorsTadashi Koga
PublisherSpringer Verlag
Pages67-81
Number of pages15
ISBN (Print)9789811370854
DOIs
StatePublished - 2019
Event5th ENRI International Workshop on ATM/CNS, EIWAC 2017 - Nakano, Japan
Duration: 14 Nov 201716 Nov 2017

Publication series

NameLecture Notes in Electrical Engineering
Volume555
ISSN (Print)1876-1100
ISSN (Electronic)1876-1119

Conference

Conference5th ENRI International Workshop on ATM/CNS, EIWAC 2017
Country/TerritoryJapan
CityNakano
Period14/11/1716/11/17

Keywords

  • Generalized polynomial chaos
  • Optimal control
  • Safety analysis

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