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COMPARISON OF DIFFERENT APPROACHES TO THE SELECTIVE SYNTHESIS OF DOMINANT DUCT MODES IN TURBOMACHINES USING LOUDSPEAKERS

Gensch, Tom Jan and Tapken, Ulf (2021) COMPARISON OF DIFFERENT APPROACHES TO THE SELECTIVE SYNTHESIS OF DOMINANT DUCT MODES IN TURBOMACHINES USING LOUDSPEAKERS. In: 27th International Congress on Sound and Vibration, ICSV 2021. Silesian University Press. ICSV27, 11.-16. Juli 2021, Prag, Tschechien. ISBN 978-837880799-5.

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Abstract

The dominant excitation of individual acoustic modes is a prerequisite for the in-depth analysis of sound propagation through installations, e.g. blade rows or acoustic liners, within turbomachinery flow ducts. A literature review yields various methods to synthesize dominant modes with loudspeaker arrays. In the present paper the most promising approaches are compared regarding their performance and accuracy. Tests are carried out by simulating experimental setups of increasing complexity levels. The setups range from the ideal case of a duct without installations and with anechoic terminations on both sides to a duct with blade-like obstacles and a reflecting termination. Included in the studies are the effects of practically relevant problems. These are superimposed reflections including scattered modes that arise at duct installations outside the actual test environment. Further considered is the impact of detuned speaker signals within the loudspeaker array and of tolerances in microphone transfer function measurements.

Item URL in elib:https://elib.dlr.de/147861/
Document Type:Conference or Workshop Item (Speech)
Title:COMPARISON OF DIFFERENT APPROACHES TO THE SELECTIVE SYNTHESIS OF DOMINANT DUCT MODES IN TURBOMACHINES USING LOUDSPEAKERS
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gensch, Tom JanTom.Gensch (at) dlr.deUNSPECIFIED
Tapken, UlfUlf.Tapken (at) dlr.dehttps://orcid.org/0000-0002-0870-1253
Date:2021
Journal or Publication Title:27th International Congress on Sound and Vibration, ICSV 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Editors:
EditorsEmailEditor's ORCID iD
Carletti, EUNSPECIFIEDUNSPECIFIED
Crocker, MUNSPECIFIEDUNSPECIFIED
Pawelczyk, MUNSPECIFIEDUNSPECIFIED
Tuma, JUNSPECIFIEDUNSPECIFIED
Publisher:Silesian University Press
ISBN:978-837880799-5
Status:Published
Keywords:mode synthesis, duct acoustics, blade row transmission, acoustic measurement techniques
Event Title:ICSV27
Event Location:Prag, Tschechien
Event Type:international Conference
Event Dates:11.-16. Juli 2021
Organizer:International Institute of Acoustics and Vibration (IIAV)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Components and Emissions
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Gensch, Tom Jan
Deposited On:05 Jan 2022 15:28
Last Modified:05 Jan 2022 15:28

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