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Application of the modal approach for prediction of forced response amplitudes for fan blades

Eichner, Franziska and Belz, Joachim (2019) Application of the modal approach for prediction of forced response amplitudes for fan blades. Journal of Engineering for Gas Turbines and Power, 141 (3), 031019-1. American Society of Mechanical Engineers (ASME). doi: 10.1115/1.4041453. ISSN 0742-4795.

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Official URL: http://gasturbinespower.asmedigitalcollection.asme.org/article.aspx?articleid=2702906&resultClick=1


Forced response is the main reason for high cycle fatigue in turbomachinery. Not all resonance points in the operating range can be avoided especially for low order excitation. For highly flexible carbon fiber reinforced polymer (CFRP) fans, an accurate calculation of vibration amplitudes is required. Forced response analyses were performed for blade row interaction and boundary layer ingestion (BLI). The resonance points considered were identified in the Campbell diagram. Forced response amplitudes were calculated using a modal approach and the results are compared to the widely used energy method. For the unsteady simulations, a time-based linearization of the unsteady Reynolds average Navier–Stokes equations were applied. If only the resonant mode was considered, the forced response amplitude from the modal approach was confirmed with the energy method. Thereby, forced response due to BLI showed higher vibration amplitudes than for blade row interaction. The impact of modes which are not in resonant to the total deformation were investigated by using the modal approach, which so far only considers one excitation order. A doubling of vibrational amplitude was shown in the case of blade row interaction for higher rotational speeds. The first and third modeshapes as well as modes with similar natural frequencies were identified as critical cases. The behavior in the vicinity of resonance shows high vibration amplitudes over a larger frequency range. This is also valid for high modes with many nodal diameters, which have a greater risk of critical strain.

Item URL in elib:https://elib.dlr.de/128146/
Document Type:Article
Title:Application of the modal approach for prediction of forced response amplitudes for fan blades
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Eichner, FranziskaFranziska.Eichner (at) dlr.deUNSPECIFIED
Belz, JoachimJoachim.Belz (at) dlr.deUNSPECIFIED
Date:March 2019
Journal or Publication Title:Journal of Engineering for Gas Turbines and Power
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1115/1.4041453
Page Range:031019-1
Publisher:American Society of Mechanical Engineers (ASME)
Keywords:counter rotating fan, forced Response, frequency response function, carbon fiber reinforced polymer (CFRP), boundary layer ingestion (BLI)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
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 > Aeroelastic Experiments
Deposited By: Belz, Joachim
Deposited On:12 Jul 2019 15:16
Last Modified:12 Jul 2019 15:34

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