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Development of EC 135 Turbulence Models via System Identification

Seher-Weiß, S. and von Grünhagen, Wolfgang (2012) Development of EC 135 Turbulence Models via System Identification. Aerospace Science and Technology, 23 (1), pp. 43-52. Elsevier. DOI: 10.1016/j.ast.2011.09.008 ISSN 1270-9638

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Official URL: http://www.journals.elsevier.com/aerospace-science-and-technology/

Abstract

The paper focuses on the development of empirical hover and low-speed turbulence models in particular for the EC 135 helicopter. The approach used is the Control Equivalent Turbulence Input method, i.e. the determination of control inputs required to generate aircraft angular and vertical rates in calm conditions that are consistent with rates observed when flying in atmospheric turbulence. For the extraction process, this method uses a mathematical model of the aircraft dynamics and aircraft angular and vertical rates measured during flight tests in turbulence. Analyzing and modeling the power spectral densities of the extracted control disturbances allows to generate low order equivalent turbulence models that can be used for control system optimization, handling qualities investigations, and pilot training. The paper describes the two applications of system identification within the development of the turbulence model: First a high fidelity state space model of the EC 135 helicopter model in hover has to be developed as a prerequisite for the extraction of the equivalent control input traces from flights tests in turbulence. Once the control equivalent turbulence input traces have been extracted and their power spectral densities determined, a second identification step yields the desired turbulence models. The paper also presents some validation of the derived turbulence models.

Item URL in elib:https://elib.dlr.de/81797/
Document Type:Article
Title:Development of EC 135 Turbulence Models via System Identification
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Seher-Weiß, S.susanne.seher-weiss (at) dlr.deUNSPECIFIED
von Grünhagen, WolfgangWolfgang.Gruenhagen (at) dlr.deUNSPECIFIED
Date:December 2012
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:23
DOI :10.1016/j.ast.2011.09.008
Page Range:pp. 43-52
Publisher:Elsevier
ISSN:1270-9638
Status:Published
Keywords:turbulence modeling, system identification, control equivalent turbulence models
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Smart Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Seher-Weiß, Susanne
Deposited On:06 May 2013 09:19
Last Modified:10 Jan 2019 15:45

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