PSI - Issue 17

Available online at www.sciencedirect.com Structural Int grity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 17 (2019) 812–821

ICSI 2019 The 3rd International Conference on Structural Integrity Displacement analysis of rotating RC helicopter blade using coupled CFD-FEA simulation and digital image correlation Pedro J. Sousa a,b, *, Francisco Barros b , Paulo J. Tavares b , Pedro M. G. P. Moreira b a Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal b INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal Rotating structures are commonly used components in the transportation and energy generation fields. A better understanding of these structures behavior under dynamic loading due to rotation is advantageous for both design and the maintenance operations. The present contribution reports a comparison of results for the rotating blades of an RC helicopter obtained using fluid-structure interaction in a computer fluid dynamics (CFD) model with measurements performed in the physical object using a digital image correlation (DIC) methodology. I n order to obtain an accurate representation of the blades, the material properties, namely Young’s Coefficient , Poisson’s Ratio and Density, were first obtained experimentally. These parameters were used in the simulation, where a fluid-structure interaction was defined between a fluid model using Reynolds Stress Transport viscosity formulation and a finite element model. Afterwards, the obtained results were compared with the experimental measurements and the differences between the two are analyzed. It was noticed that the major differences between these results are due to the coupling between the blades and the hub since the former are able to rotate freely in respect to the latter and small gaps, in the range of 0.05 mm, highly affect the results. Thus, the present work highlights the necessity of accurate representation of hub connections, even if the gaps are difficult to measure. Using live measurement techniques, it is possible to obtain the actual behavior of the blades, and either reflect the measured differences in computational models or detect issues with the physical specimen. ICSI 2019 The 3rd International Conference on Structural Integrity Displacement analysis of rotating RC helicopter blade using coupled CFD-FEA simulation and digital image correlation Pedro J. Sousa a,b, *, Francisco Barros b , Paulo J. Tavares b , Pedro M. G. P. Moreira b a Faculty of E gineeri g, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto Portugal b INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal Abstract Rotating structures re commonl used components in the transportatio nd energy generation fields. A better understanding of these structures behavior under dyna ic loading due to rotation is dvantageous for both design and the mainte ance operations. Th prese t contribution reports a comparison of results for th rotating blad s f an RC helicopter obtained using fluid-structur interacti in a co puter fluid dynamics (CFD) model with m asurements performed in the physical object using digital image correlatio (DIC) methodology. I n order to obtain an accurate re resentation of the blades, th mat rial properti s, namely Young’s Coefficient , Poisson’s Ratio and Density, wer first obtained xperimentally. These parameters were used in the simulation, wher a fluid-structure int raction was defined between a fluid odel using Reynolds Stress Transport viscosity formulatio and a finite el ment model. Afterwards, the obtained results were compar d with the exp rimental measurements and the differ nces betwe n the two are analyzed. It was noticed that the major differences between these results are due to the coupling between t e blades and the hub since t e form r are able to rotate fre ly in respect to the latter and sm ll gaps, in the ra ge f 0.05 mm, highly affect the results. Thus, the present work highlights t e necessity of accurate representation of hub connections, even if the gaps are difficult to measure. Using live measurement techniques, it is possible to obtain the actual behavior of the blades, and either reflect the measured differences in computational models or detect issues with the physical specimen. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: Digital Image Correlation, Fluid-Structure Interaction, Computer Fluid Dynamics, Rotating Structures Keywords: Digital Image Correlation, Fluid-Structure Interaction, Computer Fluid Dynamics, Rotating Structures

* Corresponding author. E-mail address: psousa@inegi.up.pt * Correspon ing author. E-mail address: psousa@inegi.up.pt

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.108