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Acoustic and image processing investigation of TPMS and fibrous porous materials for aerospace applications
Ciletti, Anthony
Ciletti, Anthony
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URCAF_2024_Ciletti.pdf
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2024-04-12
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Ciletti, Anthony. 2024. Acoustic and image processing investigation of TPMS and fibrous porous materials for aerospace applications. -- In Proceedings: 23rd Annual Undergraduate Research and Creative Activity Forum. Wichita, KS: Wichita State University, p. 10.
Abstract
Triply Periodic Minimal Surface (TPMS) and other bulk porous materials have demonstrated favorable broadband sound absorption properties, with the potential to be used as jet engine acoustic liners. Integration of fibers may also assist the acoustic performance of the material. TPMS and TPMS-fibrous samples with a range of porosity were designed and additively manufactured using FDM and SLA techniques at Wichita State (WSU) and NASA Langley, Virginia (LaRC). Raylometer and impedance tube testing was conducted to examine the acoustic performance of the samples. The characteristic impedance of each material was found via the two-cavity method. Two-cavity-based predictions were robust and accurate except for ‘artifacts’ at certain frequencies, which are subject to continued investigation. Sample acoustic performance was found to vary – the strongest relationship being increased broadband absorption for lower porosity samples. The same samples were also imaged using micro-tomography (mCT) to obtain binarized, 3D representations of the samples as-printed was extracted, and porosity and tortuosity measurements made in MATLAB. Two different approaches were used to find tortuosity, with the in-skeleton method showing the most promise. Using these digital measurements and the semi-phenomenological JCAL model, a reasonable acoustic performance prediction was made. The results of this work show promise for both the use of the two-cavity method for bulk porous material acoustic testing, and the use of image-processing tools for digital designs and printed materials. In particular, the preliminary outcomes of the later show that the development of an all-digital method to predict the acoustic performance of materials may be possible – a technology which could revolutionize acoustic material design.
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Presented to the 23rd Undergraduate Research and Creative Activity Forum (URCAF) held at the Rhatigan Student Center, Wichita State University, April 12, 2024.
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Wichita State University
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URCAF;v.23