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Local Polynomial Method Frequency-Response Calculation for Rotorcraft Applications

Fragniere, Benjamin and Wartmann, Johannes (2015) Local Polynomial Method Frequency-Response Calculation for Rotorcraft Applications. In: AHS 71st Annual Forum. 71st AHS Annual Forum, 5.-7. Mai 2015, Virginia Beach, Virginia, USA.

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Abstract

Frequency-response function calculation is an essential element in rotorcraft data analysis, especially for system identification,model validation and model analysis. This article analyzes the performance of a recently developed method for the calculation of frequency-response functions, called the local polynomial method (LPM), when applying it to rotorcraft systems. The local polynomial method is presented as an alternative to the methods that are based on segmenting and windowing the data and is particularly effective in reducing the leakage error. The performance of both methods is first compared based on simulated data from linear helicopter models in various conditions. The simulated data allows to separately investigate the influence of: signal-to-noise ratio, signal length, frequency range, type of excitation and input correlation. The conditions under which the local polynomial method is superior to the windowing methods are given. Finally, flight test data are used to validate the results observed in the simulations.

Item URL in elib:https://elib.dlr.de/100626/
Document Type:Conference or Workshop Item (Speech)
Title:Local Polynomial Method Frequency-Response Calculation for Rotorcraft Applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fragniere, Benjaminbenjamin.fragniere (at) dlr.deUNSPECIFIED
Wartmann, JohannesJohannes.Wartmann (at) dlr.deUNSPECIFIED
Date:May 2015
Journal or Publication Title:AHS 71st Annual Forum
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Frequency-response calculation, Local Polynomial Method
Event Title:71st AHS Annual Forum
Event Location:Virginia Beach, Virginia, USA
Event Type:international Conference
Event Dates:5.-7. Mai 2015
Organizer:American Helicopter Society International
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Smart Rotorcraft
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Fragniere, Benjamin
Deposited On:11 Jan 2016 11:18
Last Modified:31 Jul 2019 19:57

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