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Experimental and numerical acoustic characterization of ultrasonically absorptive porous materials

Wagner, Alexander and Martinez Schramm, Jan and Dittert, Christian and C. B. Sousa, Victor and Patel, Danish and Scalo, Carlo (2018) Experimental and numerical acoustic characterization of ultrasonically absorptive porous materials. AIAA Aviation and Aeronautics Forum and Exposition 2018, 25.-29. Juni 2018, Atlanta, USA.

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Official URL: http://www.aiaa.org/EventDetail.aspx?id=15032387957

Abstract

The paper addresses the experimental and numerical acoustic characterization of ultrasonically absorptive porous materials with random microstructure such as carbon fiber reinforced carbon ceramic C/C or C/C-SiC. The present study carries on a preceding experimental study of the authors by improving and extending the established experimental method and by conducting complementary numerical studies. The latter uses a new inverse Helmholtz Solver associated with an incident planar acoustic wave to estimate the complex acoustic impedance at the open surface of an arbitrarily shaped cavity. The experimental approach is complemented by high speed schlieren visualization and Mach-Zehnder Interferometer measurements to qualitatively and quantitatively assess the interaction between an ultrasonic wave packet and a porous surface. The main emphasis of the paper is to assess the potential and the limitations of the experimental methods and the comparison of the experimental results to the numerically obtained absorption characteristics.

Item URL in elib:https://elib.dlr.de/119025/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental and numerical acoustic characterization of ultrasonically absorptive porous materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, AlexanderAlexander.Wagner (at) dlr.deUNSPECIFIED
Martinez Schramm, Janjan.martinez (at) dlr.deUNSPECIFIED
Dittert, ChristianChristian.Dittert (at) dlr.deUNSPECIFIED
C. B. Sousa, VictorSchool of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIED
Patel, DanishSchool of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIED
Scalo, CarloSchool of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIED
Date:2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Hypersonic Boundary-Layer Transition, HEG, ultrasonically absorptive coating, porous materials, acoustic absorption
Event Title:AIAA Aviation and Aeronautics Forum and Exposition 2018
Event Location:Atlanta, USA
Event Type:international Conference
Event Dates:25.-29. Juni 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Göttingen , Stuttgart
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Institute of Structures and Design > Space System Integration
Deposited By: Bachmann, Barbara
Deposited On:06 Jul 2018 11:38
Last Modified:31 Jul 2019 20:16

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