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Flutter susceptibility approximation via curve fitting and MAC-analysis in an automated optimization design process

Blocher, Michael and Aulich, Anne-Laure (2013) Flutter susceptibility approximation via curve fitting and MAC-analysis in an automated optimization design process. In: Proceedings of ASME TurboExpo 2013. ASME TurboExpo 2013, 3-7 June 2013, San Antonio, Texas, USA. doi: 10.1115/GT2013-94577.

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At present, several institutes of the German Aerospace Center (DLR) jointly work on the design of a counter rotating fan made of carbon fiber reinforced material. To generate blades with superior aerodynamic properties, a multidimensional optimization tool developed by the Institute of Propulsion Technology is used. Since aeroelastic problems often arise during late design stages and are inevitably very expensive to solve, the goal is to include aeroelastic estimations into this optimization tool which is used in the early design phase. Assuming that rotors generally show a relatively sinusoidal behavior of the damping-over-IBPA-diagram at operating points sufficiently far away from the surge line, not all IBPAs need to be investigated in order to determine the lowest aerodynamic damp- ing. An algorithm was implemented that predicts the IBPA with the lowest damping value from three already calculated IBPAs through which a sine curve is fitted. It was established that this algorithm is valid for damping-vs-IBPA-curves that possess a roughly sinusoidal shape. A further investigation of the possibilities of time reduction in the automated design process revealed that flow solutions and structural properties do not change significantly during one optimization run. Consequently, a method was found to measure the similarity of two different cases. For very similar cases it can be assumed that the aeroelastic properties do not change significantly. Therefore, just the IBPA with the predictably lowest aerodynamic damping value needs to be calculated. An introduction to the theory of these approaches is presented and examples arising during the design of the counter rotating fan are given

Item URL in elib:https://elib.dlr.de/83120/
Document Type:Conference or Workshop Item (Speech)
Title:Flutter susceptibility approximation via curve fitting and MAC-analysis in an automated optimization design process
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:Proceedings of ASME TurboExpo 2013
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:aeroelasticity, counter rotating, time reduction, curve fitting, MAC value
Event Title:ASME TurboExpo 2013
Event Location:San Antonio, Texas, USA
Event Type:international Conference
Event Dates:3-7 June 2013
Organizer:ASME IGTI
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Institute of Aeroelasticity > Aeroelastic Experiments
Institute of Propulsion Technology > Fan and Compressor
Deposited By: Blocher, Michael
Deposited On:29 Jul 2013 09:05
Last Modified:21 Jul 2023 08:22

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