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Development and Investigation of Algorithms for Modal Identification of Linear Systems with a Local Nonlinear Mechanism

Maathuis, Hauke (2021) Development and Investigation of Algorithms for Modal Identification of Linear Systems with a Local Nonlinear Mechanism. DLR-Interner Bericht. DLR-IB-AE-GO-2021-80. Master's. Leibniz Universität Hannover. 92 S.

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Abstract

Vibration testing is a crucial step within the admission process of an aircraft. Before certification, these tests are essential to validate the existing numerical models and to ensure flutter clearance to guarantee the safe operation of the system. Currently, these tests are performed within the so called Ground Vibration Test, where the aircraft is under operational-like boundary conditions and excited in a hangar with shakers to identify the modal parameters of the system. However, these procedures are very time intensive and take place during a period of aircraft development that is very time critical. To circumvent this problem, the DLR has developed a new method that promises to save time, named Taxi Vibration Test. During this process, the aircraft merely taxis over the uneven runway. The occurring vibrations are recorded by sensors. Complex algorithms are then used to identify the modal parameters. In contrast to the Ground Vibration Test where the aircraft is hung up with cords to imitate the boundary conditions, the nonlinear landing gear is involved within the system which influence the modal parameters. Since the algorithms used for this purpose are formulated for linear systems, this work addresses the problem in which various methods are developed and investigated to identify the overall nonlinear system within the Taxi Vibration Test. In doing so, a promising algorithm is presented that can identify the nonlinearity for the most part.

Item URL in elib:https://elib.dlr.de/142627/
Document Type:Monograph (DLR-Interner Bericht, Master's)
Title:Development and Investigation of Algorithms for Modal Identification of Linear Systems with a Local Nonlinear Mechanism
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Maathuis, HaukeHauke.Maathuis (at) dlr.deUNSPECIFIED
Date:26 April 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:92
Status:Published
Keywords:numerical modelling, nonlinear structural dynamics, Taxi-Vibration-Test, Stochastic Subspace Identification, dynamic friction model
Institution:Leibniz Universität Hannover
Department:Institut für Dynamik und Schwingungen
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Deposited By: Maathuis, Hauke
Deposited On:06 Oct 2021 16:39
Last Modified:11 Oct 2021 15:57

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