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X-ray computed tomography method for macroscopic structural property evaluation of active twist composite blades

Ahn, Joon H. and Hwang, Hyun J. and Chang, Sehoon and Jung, Sung N. and Kalow, Steffen and Keimer, Ralf (2021) X-ray computed tomography method for macroscopic structural property evaluation of active twist composite blades. Aerospace. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/aerospace8120370. ISSN 2226-4310.

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Abstract

This paper describes an evaluation of the structural properties of the next-generation active twist blade using X-ray computed tomography (CT) combined with digital image processing. This non-destructive testing technique avoids the costly demolition of the blade structure. The CT scan covers the whole blade region, including the root, transition, and tip regions as well as the airfoil blade regions, in which there are spanwise variations in the interior structural layout due to the existence of heavy instrumentation. The three-dimensional digital image data are processed at selected radial stations, and finite element beam cross-section analyses are conducted to evaluate the structural properties of the blade at the macroscopic level. The fidelity of the digital blade model is first assessed by correlating the estimated blade mass with the measured data. A separate me- chanical measurement is then carried out to determine the representative elastic properties of the blade and to verify the predicted results. The agreement is found to be good to excellent for the mass, elastic axis, flap bending, and torsional rigidity. Finally, a sensitivity analysis is conducted to clarify the impact of modeling the sensor and actuator cables, nose weight, and manufacturing im- perfections on the structural properties of the blade.

Item URL in elib:https://elib.dlr.de/148201/
Document Type:Article
Title:X-ray computed tomography method for macroscopic structural property evaluation of active twist composite blades
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ahn, Joon H.Department of Aerospace Information Engineering, Konkuk UniversityUNSPECIFIED
Hwang, Hyun J.Department of Aerospace Information Engineering, Konkuk UniversityUNSPECIFIED
Chang, SehoonDepartment of Aerospace Information Engineering, Konkuk UniversityUNSPECIFIED
Jung, Sung N.Department of Aerospace Information Engineering, Konkuk UniversityUNSPECIFIED
Kalow, Steffensteffen.kalow (at) dlr.dehttps://orcid.org/0000-0002-5308-1209
Keimer, RalfRalf.Keimer (at) dlr.dehttps://orcid.org/0000-0001-9638-4413
Date:2021
Journal or Publication Title:Aerospace
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.3390/aerospace8120370
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2226-4310
Status:Published
Keywords:Active twist blade, CT scan, Digital reproduction, Structural property, Sensitivity analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Kalow, Steffen
Deposited On:12 Jan 2022 16:40
Last Modified:28 Jan 2022 12:26

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