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Relevant bibliographies by topics / Sound Acoustical materials

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Academic literature on the topic 'Sound Acoustical materials'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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Journal articles on the topic "Sound Acoustical materials"

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Kumar, Sanjay, and Heow Pueh Lee. "Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances." Crystals 10, no. 8 (August 7, 2020): 686. http://dx.doi.org/10.3390/cryst10080686.

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In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well.

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Panneton, Raymond, and Yacoubou Salissou. "Indirect acoustical characterization of sound absorbing materials." Journal of the Acoustical Society of America 126, no. 4 (2009): 2297. http://dx.doi.org/10.1121/1.3249416.

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Iannace, Gino. "The acoustic characterization of green materials." Building Acoustics 24, no. 2 (April 25, 2017): 101–13. http://dx.doi.org/10.1177/1351010x17704624.

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Natural materials are a valid alternative to traditional synthetic materials in the fields of acoustic treatments and energy saving. Natural fibres have been used to produce sound-absorbing panels. This article reports the acoustical characterization of the following natural fibres: straw, hay, plant litter and different sized wood chips. The acoustic measurements were carried out with an impedance tube. The acoustic absorption values were measured in a frequency range between 200 and 2000 Hz.

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Diharjo, Kuncoro, Ubaidillah, Wijang Wisnu Raharjo, Joko Pitoyo, and Mustaqim. "Underwater Acoustics Evaluation of Glass Fiber – Polyurethane Sandwich Composite." Applied Mechanics and Materials 660 (October 2014): 516–20. http://dx.doi.org/10.4028/www.scientific.net/amm.660.516.

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This article presents underwater acoustics evaluation of glass fiber – polyurethane sandwich composite which is useful for ship materials. The composite consists of two main functional laminations namely structural and acoustical lamination. The structural lamination is constructed from polyester and polyethylene fibers while the polyurethane is potential for acoustical lamination. The fabrication involves vacuum bagging and conventional hydraulic methods. The materials will be treated in both with and without immersion in sea water. The immersion process takes time about 72 hours. The properties of acoustics for each materials generally have high insertion loss (maximum found 25 dB), but some of them can reach low insertion loss (below 5 dB). The optimization of combination between structural and acoustic materials is promising to be investigated in near future to achieve the optimum properties of materials in terms of sound transparency.

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Xu, Xiaomei, and Ping Lin. "Parameter identification of sound absorption model of porous materials based on modified particle swarm optimization algorithm." PLOS ONE 16, no. 5 (May 4, 2021): e0250950. http://dx.doi.org/10.1371/journal.pone.0250950.

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Porous materials have been widely used in the field of noise control. The non-acoustical parameters involved in the sound absorption model have an important effect on the sound absorption performance of porous materials. How to identify these non-acoustical parameters efficiently and accurately is an active research area and many researchers have devoted contributions on it. In this study, a modified particle swarm optimization algorithm is adopted to identify the non-acoustical parameters of the jute fiber felt. Firstly, the sound absorption model used to predict the sound absorption coefficient of the porous materials is introduced. Secondly, the model of non-acoustical parameter identification of porous materials is established. Then the modified particle swarm optimization algorithm is introduced and the feasibility of the algorithm applied to the parameter identification of porous materials is investigated. Finally, based on the sound absorption coefficient measured by the impedance tube the modified particle swarm optimization algorithm is adopted to identify the non-acoustical parameters involved in the sound absorption model of the jute fiber felt, and the identification performance and the computational performance of the algorithm are discussed. Research results show that compared with other identification methods the modified particle swarm optimization algorithm has higher identification accuracy and is more suitable for the identification of non-acoustical parameters of the porous materials. The sound absorption coefficient curve predicted by the modified particle swarm optimization algorithm has good consistency with the experimental curve. In the aspect of computer running time, compared with the standard particle swarm optimization algorithm, the modified particle swarm optimization algorithm takes shorter running time. When the population size is larger, modified particle swarm optimization algorithm has more advantages in the running speed. In addition, this study demonstrates that the jute fiber felt is a good acoustical green fibrous material which has excellent sound absorbing performance in a wide frequency range and the peak value of its sound absorption coefficient can reach 0.8.

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Dlhý, Dušan, and Peter Tomašovič. "Effects of the Sound Insulation of the Outer Structure on the Price." Applied Mechanics and Materials 820 (January 2016): 472–77. http://dx.doi.org/10.4028/www.scientific.net/amm.820.472.

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Manufacturers indicate sound insulation of envelope structures of different materials. Acoustical properties of manufactured openings as windows and doors (plastic, wooden, metallic) are known. Following theoretic relations for calculation of consequential sound insulation of acoustic composite wall Rw, it is possible to work out options of walls and openings of various materials.

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Tang, Xiaoning, and Xiong Yan. "Airflow resistance of acoustical fibrous materials: Measurements, calculations and applications." Journal of Industrial Textiles 49, no. 8 (October 15, 2018): 981–1010. http://dx.doi.org/10.1177/1528083718805714.

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The acoustic performance of fibrous materials is mainly determined by its airflow resistance, and it is a parameter of the resistance that the airflow meets through the materials. This paper has summarized the recent advances on the measurements, calculations and applications of airflow resistance. Firstly, different methods for airflow resistance measurements are presented, mainly including the direct airflow method, alternating airflow method and acoustical method. We have summarized the development history, current status and industrial applications of these methods. Secondly, this paper has summarized the models of calculating airflow resistance. Most of these empirical models are based on the characteristic parameters of fibrous materials, for instance bulk density, fiber diameter, porosity and thickness. Thirdly, this review has gathered the applications of airflow resistance in sound absorption and noise control. It is a crucial parameter in the prediction of both normal incidence sound absorption and reverberation chamber sound absorption. In conclusion, this review has concluded with some perspectives for the measurements, calculations and applications of airflow resistance.

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Abbad, Ahmed, Kévin Jaboviste, Morvan Ouisse, and Nicolas Dauchez. "Acoustic performances of silicone foams for sound absorption." Journal of Cellular Plastics 54, no. 3 (September 21, 2017): 651–70. http://dx.doi.org/10.1177/0021955x17732305.

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The aim of this study is to investigate the link between the elaboration process, the microstructure and the acoustic behaviour of silicone foams obtained using a two-component silicone. Different parameters such as the ratio of components, the addition of a thinning agent and the curing temperature are varied, with the objective of understanding the influence of each parameter in the foam’s acoustic absorption. The microstructure is analysed using scanning electron microscopy and acoustic properties are measured. Two non-acoustical properties of the porous material are also investigated, namely the porosity and the flow resistivity. Pore cell size and interconnected porosity have great impact on acoustical properties. Significant enhancements of the absorption properties could be obtained in the low-frequency band by increasing the rate of agent B through an increase in the amount of interconnected porous cells. An improvement in absorption is observed in the higher frequency range when a thinning agent is added to the mixture. Representative models of the foam for acoustic simulations are obtained allowing estimation of the tortuosity, viscous and thermal characteristic length from acoustic measurements. These models are able to simulate the acoustic behaviour of the silicone foams when embedded in sound packages.

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Shahani, Fereshteh, Parham Soltani, and Mohammad Zarrebini. "The Analysis of Acoustic Characteristics and Sound Absorption Coefficient of Needle Punched Nonwoven Fabrics." Journal of Engineered Fibers and Fabrics 9, no. 2 (June 2014): 155892501400900. http://dx.doi.org/10.1177/155892501400900210.

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Control of acoustical related phenomenon in environments, such as work place and residential homes, using various textile materials has gained paramount importance. Nonwoven fabrics in general are ideal acoustical insulator due to their high volume-to-mass ratio. This research examined acoustic characteristics of structured needle punched floor coverings in relation to fiber fineness, surface effect, punch density, areal density, and chemical bonding process. Sound absorption of the test samples was measured using the impedance tube method. Results indicate that fabrics produced from finer fibers absorb sound waves more efficiently. It was found that, samples with no surface effect enjoy the maximum sound absorption. This is followed by velour and cord surface effect samples. It was established that, higher levels of punch density and higher areal density caused the noise reduction coefficient (NRC) of the fabrics to be increased. It was also found that chemical finishing adversely affected the sound absorption property of the samples.

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Wang, Yan Song, Jian Peng Zhou, and Yan Feng Xing. "Development of a Standing Wave-Tube System for Acoustical Property Measurement of Sound Absorption Materials Used on Vehicles." Key Engineering Materials 474-476 (April 2011): 1146–50. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1146.

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A standing wave-tube system for acoustical property measurement of vehicle-used sound absorption materials is developed in this paper. Theoretically, the standing wave ratio method and the two-cavity method with two-microphone configurations are combined and applied for calculating some acoustical parameters, such as sound absorption ratio, reflection coefficient, characteristic impedance, propagation constant, of a sample material. Based on the combined method, the standing wave-tube system including two microphones, an A/D board, a signal amplifier, a DSP computer and a set of software is carefully designed and performed. The verification results suggest that the newly designed system is accurate for acoustical property measurement of the materials used on vehicles. It can be directly used for selecting noise-control materials in vehicle acoustical designs.

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Dissertations / Theses on the topic "Sound Acoustical materials"

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Dai, Hin Man. "Light weight low frequency sound focus lens /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202005%20DAI.

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Ho, Kin-Ming. "Impedance measurement of resonant sonic crystals /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202002%20HOK.

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Tan, Lin. "Development of micro-acoustic devices with applications of viscous effects." Diss., Online access via UMI:, 2006.

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Jackson, Christophe E. "Construction and characterization of a portable sound booth for onsite voice recording /." Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2010r/jackson.pdf.

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Thesis (M.S.)--University of Alabama at Birmingham, 2009.
Title from PDF t.p. (viewed June 30, 2010). Additional advisors: Stephen A. Watts, Paul A. Richardson, John T. Tarvin. Includes bibliographical references (p. 36-38).

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Fung, Kin-Hung. "Phononic band gap of locally resonant sonic materials with finite thickness /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20FUNG.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 73-74). Also available in electronic version. Access restricted to campus users.

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Anders, William S. "Structural acoustic analysis of shape memory alloy hybrid composite panels." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-11012008-063243/.

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Lee, Iljae. "Acoustic characteristics of perforated dissipative and hybrid silencers." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1117631229.

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Thesis (Ph. D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xvi, 195 p.; also includes graphics. Includes bibliographical references (p. 183-195). Available online via OhioLINK's ETD Center

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Wu, Ruimeng. "UTILIZATION OF EMPIRICAL MODELS TO DETERMINE THE BULK PROPERTIES OF COMPRESSED SOUND ABSORPTIVE MATERIALS." UKnowledge, 2017. https://uknowledge.uky.edu/me_etds/106.

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Empirical models based on flow resistivity are commonly used to determine the bulk properties of porous sound absorbing materials. The bulk properties include the complex wavenumber and complex characteristic impedance which can be used directly in simulation models. Moreover, the bulk properties can also be utilized to determine the normal incidence sound absorption and specific acoustic impedance for sound absorbing materials of any thickness and for design of layered materials. The sound absorption coefficient of sound absorbing materials is measured in an impedance tube using wave decomposition and the measured data is used to determine the flow resistivity of the materials by least squares curve fitting to empirical equations. Results for several commonly used foams and fibers are tabulated to form a rudimentary materials database. The same approach is then used to determine the flow resistivity of compressed sound absorbing materials. The flow resistivities of the compressed materials are determined as a function of the compression ratio. Results are then used in conjunction with transfer matrix theory to predict the sound absorptive performance of layered compressed absorbers with good agreement to measurement.

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Huang, Weichun. "Acoustic properties of natural materials." Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1031/document.

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Dans cette thèse, nous étudions un métamatériau inspiré de la paille de blé pour l'absorption parfaite du son. Une botte de paille estidéalisée comme un milieu poreux anisotrope, composé d’un arrangement périodique très concentré de tubes creux cylindriques. L’approche théorique de ce métamatériau repose sur l'homogénéisation asymptotique à deux échelles d'un réseau perméable de résonateursparfaitement rigides dont la physique est enrichi par des résonances internes. Les principales caractéristiques de ce milieu poreux sont lacompressibilité effective négative autour de la résonance du tube et la réduction drastique de la vitesse de propagation du son (slowsound) à très basse fréquence. Une configuration optimale est conçue, basée sur la condition de couplage critique, pour laquelle la fuited’énergie du système résonnant ouvert est parfaitement compensée par les pertes intrinsèques induites par les pertes viscothermiques.Des mesures en tube à impédance sont effectuées sur des échantillons fabriqués par impression additive pour valider les résultatsthéoriques. Nous montrons que ce métamatériau est un absorbeur sub-longueur d'onde capable d’une absorption parfaite à très bassefréquence et d'introduire une quasi-bande interdite autour de la résonance du tube. De plus, la nature anisotrope de ce matériau conduit àune absorption globalement élevée à basse fréquence et ce pour toutes les incidences. Cette étude offre la possibilité de concevoir unabsorbeur acoustique sélectif en angle et en fréquence. Pour conclure, les résultats de cette thèse montrent que la paille est un boncandidat pour une absorption acoustique parfaite
Straw-inspired metamaterials for sound absorption are investigated in this Thesis. A straw stack is idealized as a highly concentratedresonant anisotropic porous medium constituted of a periodic arrangement of densely packed cylindrical hollow tubes. The approach tothis metamaterial relies on the two-scale asymptotic homogenization of a permeable array of perfectly rigid resonators, where the physicsis further enriched by tailoring inner resonances. The main features of such sound absorbing medium are the possibility for the effectivecompressibility to become negative around the tube resonance and the drastic reduction of the effective sound speed (slow sound) at verylow frequency in the system. Moreover, an optimal configuration for sound absorption is designed, based on the critical couplingcondition, in which the energy leakage out of the open resonant system is perfectly compensated by the intrinsic losses induced by thevisco-thermal losses both in the anisotropic matrix and in the resonators. Impedance tube measurements are performed on 3-D printedsamples with controlled parameters to validate the theoretical results. This metamaterial is a sub-wavelength absorber that can achievetotal absorption at a very low frequency and possesses a quasi-band-gap around the tube resonance. Furthermore, the anisotropic nature ofthe configuration gives rise to high absorption at low-frequency range for all incidences and diffuse field excitation. It paves the way tothe design of angular and frequency selective sound absorber. To conclude, the results of this Thesis show that straw is a good candidatefor perfect sound absorption

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Caille, Gary W. "The acoustic field scattered from some approximate pressure release materials coating a finite cylinder." Thesis, Monterey, Calif. : Naval Postgraduate School, 1988. http://handle.dtic.mil/100.2/ADA194768.

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Books on the topic "Sound Acoustical materials"

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Sound & vibration engineered environments: Manufacturers & fabricators of architectural, building & mechanical system products. LaCrosse, WI, U.S.A: R/T Books, 1988.

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Vance, Mary A. Sound absorbent materials: A revision of A 662. Monticello, Ill., USA: Vance Bibliographies, 1988.

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Allard, J. Biot theory and acoustical properties of high porosity fibrous materials and plastic foams. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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Martin, Paul R. National Voluntary Laboratory Accreditation Program: Acoustical testing services. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1994.

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Fuchs, Helmut V. Applied Acoustics: Concepts, Absorbers, and Silencers for Acoustical Comfort and Noise Control: Alternative Solutions - Innovative Tools - Practical Examples. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Deymier, Pierre A. Acoustic Metamaterials and Phononic Crystals. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Craster, Richard V. Acoustic Metamaterials: Negative Refraction, Imaging, Lensing and Cloaking. Dordrecht: Springer Netherlands, 2013.

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Allard, J. F. Propagation of sound in porous media: Modelling sound absorbing materials. 2nd ed. Hoboken, N.J: Wiley, 2009.

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Allard, J. F. Propagation of sound in porous media: Modelling sound absorbing materials. 2nd ed. Hoboken, N.J: Wiley, 2009.

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Noureddine, Atalla, ed. Propagation of sound in porous media: Modelling sound absorbing materials. 2nd ed. Hoboken, N.J: Wiley, 2009.

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Book chapters on the topic "Sound Acoustical materials"

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Liu, Songping, Enming Guo, V. M. Levin, and Yu S. Petronyuk. "Measuring Sound Velocities and Anisotropy of Microstructural Units of Laminate Composite Materials by Microacoustical Technique." In Acoustical Imaging, 199–206. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2402-3_26.

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Ueda, M., and E. Morimatsu. "Analysis of Echoes from a Sphere in Focused Sound Field and its Application to Material Characterization." In Acoustical Imaging, 247–56. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0791-4_26.

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Gan, Woon Siong. "Basic Mechanisms of Sound Propagation in Solids for Negative Materials." In New Acoustics Based on Metamaterials, 47–75. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6376-3_3.

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Allard, J. F. "Acoustic Impedance at Normal Incidence of Fluids, and Highly Porous Materials." In Propagation of Sound in Porous Media, 16–30. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1866-8_2.

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Allard, J. F. "Acoustic Impedance at Oblique Incidence in Fluids, and Highly Porous Materials." In Propagation of Sound in Porous Media, 31–47. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1866-8_3.

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Hassan, Haris Fazilah, and Rosemizi Abd Rahim. "Micro-Power Energy Harvester Using Piezoelectric for Acoustic Sound Wave Energy Harvesting." In Advanced Structured Materials, 1–6. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46036-5_1.

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Garrett, Steven L. "Membranes, Plates, and Microphones." In Understanding Acoustics, 283–330. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_6.

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Abstract The restoring forces on membranes are due to the applied tension, while the restoring forces for plates are due to the flexural rigidity of the plate’s material. The transition to two dimensions introduces some features that did not show up in our analysis of one-dimensional vibrating systems. Instead of applying boundary conditions at one or two points, those constraints will have to be applied along a line or a curve. In this way, incorporation of the boundary condition is linked inexorably to the choice of coordinate systems used to describe the resultant normal mode shape functions. For two-dimensional vibrators, two indices are required to specify the frequency of a normal mode, fm,n, with the number of modes in a given frequency interval increasing in proportion to the center frequency of the interval, even though that interval remains a fixed frequency span. It is also possible that modes with different mode numbers might correspond to the same frequency of vibration, a situation that is designated as “modal degeneracy.” A membrane’s response to sound pressures provides the basis for broadband condenser microphone technology that produces signals related to the electrical properties of that capacitor and the charge stored on its plates.

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Zizka, Jan, Petr Hana, L. Hamplova, and Z. Motycka. "Cutting Process Monitoring by Means of Acoustic Emission Method; Part I - New Approach of Acoustic Emission Sensor; Part II - Transformation of Acoustic Emission into Audible Sound." In Advanced Materials Research, 105–10. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-420-0.105.

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Aramaki, Mitsuko, Mireille Besson, Richard Kronland-Martinet, and Sølvi Ystad. "Timbre Perception of Sounds from Impacted Materials: Behavioral, Electrophysiological and Acoustic Approaches." In Computer Music Modeling and Retrieval. Genesis of Meaning in Sound and Music, 1–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02518-1_1.

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Hong, Jiajun, Takuya Yoshimura, and Makoto Takeshita. "A Study of the Vibration Reduction Effect of Sound Absorbing Material Within Acoustic Box." In Vibration Engineering for a Sustainable Future, 83–89. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-48153-7_11.

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Conference papers on the topic "Sound Acoustical materials"

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Putra, Azma, Fazlin Abd Khair, and Mohd Jailani Mohd Nor. "Enhancement of acoustical performance of hollow tube sound absorber." In SUSTAINABLE ENERGY AND ADVANCED MATERIALS : Proceeding of the 4th International Conference and Exhibition on Sustainable Energy and Advanced Materials 2015 (ICE-SEAM 2015). AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4943489.

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Saha, Pranab, Satyajeet P. Deshpande, Charles Moritz, and Steve Sorenson. "SAE and Other Standards for Determining Acoustical Properties of Sound Package Materials." In SAE 2015 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2015. http://dx.doi.org/10.4271/2015-01-2207.

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Zhang, Bo, and Jian Zhu. "Inverse methods of determining the acoustical parameters of porous sound absorbing metallic materials." In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000329.

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Cherng, John G., Qian Xi, Pravansu Mohanty, and Gordon Ebbitt. "A Comparative Study on Sound Transmission Loss and Absorption Coefficient of Acoustical Materials." In SAE 2011 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-01-1625.

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Pop, Petru A., Patricia A. Ungur, Liviu Lazar, and Florin M. Marcu. "Advanced Procedure Used for Determining the Absorption Coefficient of Sonic-Absorbent Materials." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63646.

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Solving the acoustical problem and improving the impact indoor environmental quality represents a priority for many researchers and manufacturers of materials with a high noise reduction of coefficient rating. The paper presents a real solution for determination the sound-absorption coefficient of materials with acoustical properties from the gypsum family. The procedure used for test is standing wave method into a Kundt tube. The experiment setup used a complex installation of a Kundt tube containing a loudspeaker for emitting the sound waves at a well-defined frequency by a first PC, a microphone for detecting and transmitting the signal to a second PC for analyzing and processing the data. All of these were performed by using MATLAB Programs. Tests were conducted with two material samples with original receipts, one from gypsum and other from special gypsum plaster with sound-absorbent properties. The frequency was set separately for each material from 50 Hz to 1250 Hz to determine their sound-absorption coefficients. The result of experiments shows the efficiency of installation and superiority of special gypsum plaster vs. gypsum along entire frequency range of testing that can be carrying on to other materials with sound properties.

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Atalla, Noureddine, and Dilal Rhazi. "Modeling the Vibroacoustics Response of Structures With Attached Noise Control Materials." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65876.

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This paper discusses the modeling of the vibration and acoustic response of panels with attached sound packages, using both analytical and numerical methods. Special attention is devoted to the modeling of various types of porous materials (rigid, limp, porous elastic,…) in various mounting conditions (single wall and double wall) together with the calculation of various vibroacoustic indicators (vibration response, radiated power, transmission loss, added damping, air-borne insertion loss, Structure-borne insertion loss…) under various excitations (acoustical, mechanical and Turbulent Boundary Layer). In particular, examples illustrating the practicality and usefulness of these methods are presented.

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Ohadi, A. R., and M. Moghaddami. "Sound Absorption Prediction Using Finite Element Model Based on Modified Biot Poroelastic Model." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95126.

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Simulation of the porous materials based on modified Biot poroelastic model is done in this paper, and the obtained results are compared with the equivalent fluid model available from the literature. The effect of physical parameters of the solid phase and also boundary conditions are studied. For this purpose, the modified Biot equations are obtained in terms of a reduced number of variables. In order to investigate the acoustical behavior of porous materials, the governing equations are simulated using the weighted residual finite element code, developed by the authors. The absorption coefficient diagrams of a selected material are obtained and compared for modified Biot poroelastic model and equivalent fluid model. In addition, the effects of the physical parameters of the solid phase and boundary conditions on the acoustical treatment of the material are studied.

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Keshavarz, Reza, and Abdolreza Ohadi. "Study on Sound Absorption and Transmission Loss of Transversely Isotropic Multi Layers Porous Material." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25078.

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In this work, acoustic wave propagation at oblique incidence in a multi layers material that consists of different layers such as air, homogenous and transversely isotropic porous layers is described. Transfer matrix method (TMM) is applied to compute acoustical properties of multilayer system. For transversely isotropic layer, the transfer matrix based on total displacement formulation of the Biot’s theory is used. Finally, for multi layers porous materials, variation of the sound absorption coefficient and transmission loss versus frequency and angle of incidence are determined. Analysis shows that transversely isotropic porous layers changes the absorption coefficient and improve the transmission loss.

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Clark, Ray C., and Julius C. Mekwinski. "Gas Turbine Engine Noise Control Using Fiber Metal Lined Ducts." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-433.

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Fiber metal acoustic sheet materials are used in lined duct sound absorbers for gas turbine engine noise. Duct treatment utilizes a fiber metal face sheet backed by a cavity of controlled depth. The fiber metal facing and cavity depth provide a tuned system that is broadly effective in a desired frequency band. Fiber metal lined ducts are used in engine applications such as fan ducts, inlet cowls, auxiliary power units and environmental control systems. This approach is used in engine treatments to provide effective absorption within engine limits of weight and space. This paper discusses design methodology for fiber metal ducts. Topics include frequency tuning the absorber, treated area versus noise reduction, matching the acoustical impedance of the fiber metal to the air in the duct, the effects of flow and sound pressure level in the duct on noise reduction, and an example of noise reduction achieved in an engine application.

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Gupta, Anupam K., Yanqing Fu, Dane Webster, and Rolf Müller. "Bat Noseleaves as an Inspiration for Smart Emission Baffle Structures." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3120.

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Baffle shapes are commonly used in engineered devices to interface sound sources with the free field. Examples are acoustic horns seen in megaphones and horn-loaded loudspeakers. Typical for these devices are simple, static shapes that serve primarily an impedance-matching function. Diffracting baffles linked to a sound source are also common in the biosonar system of bats. In particular in bat groups that emit their ultrasonic pulses nasally, the nostrils are always surrounded by some baffle shape. This is the case across several large and diverse bat families such as horseshoe bats (Rhinolophidae), Old World leaf-nosed bats (Hipposideridae), and New World leaf-nosed bats (Phyllostomidae). However, biosonar baffles differ from their technical counterparts in two important ways: They typically have a much greater geometrical complexity and they are capable of non-rigid shape changes over time. Although simple horn shapes can be found in the noseleaves of many bat species, they are rarely as plain and regular as in megaphones and other technical applications of acoustical horns. Instead, the baffles are broken up into several parts that are frequently augmented with intricate local shape features such as ridges, furrows, and spikes. Furthermore, we have observed that in species belonging to the horseshoe bats and the related Old World leaf-nosed bats these local shape features are often not static, but can undergo displacements as well as non-rigid deformations. At least some of these dynamic effects are not passive byproducts of e.g., sound production or exhalation, but due to specific muscular actuation that can be controlled by the animals. To study these intricate, dynamic baffles as inspirations for smart structures, we have recreated the degrees of freedoms that Old World leaf-nosed bats have in deforming their noseleaves in a digital model using computer animation techniques. In its current form, our model has 6 degrees of freedom that can be used to test interactions between different motions using actuation patterns that occur in life as well as patterns that have not been observed, but could aid understanding. Because of the high-dimensional parameter space spanned by the different degrees of freedom, a high-performance computing platform has been used to characterize the acoustic behavior across a larger number of deformed no seleaf shapes. A physical test bed is currently under construction for implementing baffle motions that have been found to result in interesting changes of the acoustic device characteristics and could hence be of use to engineering applications.

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