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How to perform Flight Vibration Testing based on Operational Modal Analysis?

Schwochow, Jan (2018) How to perform Flight Vibration Testing based on Operational Modal Analysis? OSTIV Conference Proceedings, XXXIV. TU Braunschweig. ISBN 978-3-947623-07-5.

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[img] PDF
295kB

Abstract

Flutter is a dynamic instability caused by the interaction of the structural dynamics of the aircraft and unsteady aerodynamic forces. It occurs when one of the elastic modes of the airframe tends to negative damping above a critical speed. Prediction and flutter clearance are important problems in the design, testing and typecertification of sailplanes. From a practical point of view, Flight Vibration Testing (FVT) needs to be performed whenever a new sailplane is built or an existing type is modified. The application of Operational Modal Analysis (OMA) methods may provide improvements to identify modal parameters of multiple modes in one step without knowing the type of external excitation. If the identification is repeated for increasing flight velocities, it is possible to find the aeroelastic damping trends and to extrapolate to the stability boundary. The application of OMA needs a broadband excitation spectrum, which result from impulsive control kicks or continuing random excitation like gusts and turbulence in the atmosphere. To demonstrate the performance of the proposed method measured time histories are post-processed to identify all relevant mode shapes with natural frequencies and damping rates of the flying sailplane. Requirements for test equipment, software and the procedure to perform the FVT are summarized.

Item URL in elib:https://elib.dlr.de/121317/
Document Type:Proceedings
Title:How to perform Flight Vibration Testing based on Operational Modal Analysis?
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schwochow, Janjan.schwochow (at) dlr.dehttps://orcid.org/0000-0002-5430-8479
Date:1 August 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:XXXIV
Page Range:pp. 39-42
Editors:
EditorsEmail
Radespiel, RolfTU Braunschweig
Publisher:TU Braunschweig
Series Name:OSTIV Conference Proceedings
ISBN:978-3-947623-07-5
Status:Published
Keywords:aeroelasticity, flutter, flight vibration test, operational modal analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Flugzeug-SAR
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Flight Experiments > Braunschweig
Deposited By: Schwochow, Jan
Deposited On:13 Aug 2018 14:08
Last Modified:31 Jul 2019 20:19

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