Academic literature on the topic 'Sound panel'

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Journal articles on the topic "Sound panel"

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Perdue, Jay. "Sound absorbing panel." Journal of the Acoustical Society of America 102, no. 6 (1997): 3249. http://dx.doi.org/10.1121/1.419557.

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Papakonstantinou, Panagiotis. "Sound absorbing panel." Journal of the Acoustical Society of America 125, no. 2 (2009): 1264. http://dx.doi.org/10.1121/1.3081348.

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Wolf, Jerry M., and Wilbur D. Holben. "Sound absorption panel." Journal of the Acoustical Society of America 79, no. 4 (April 1986): 1196. http://dx.doi.org/10.1121/1.393753.

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Richardson, Brian E. "Sound-attenuating panel." Journal of the Acoustical Society of America 99, no. 4 (1996): 1821. http://dx.doi.org/10.1121/1.415353.

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Mekwinski, Julius. "Sound absorbing panel." Journal of the Acoustical Society of America 118, no. 2 (2005): 592. http://dx.doi.org/10.1121/1.2040263.

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Johnson, Lahnie. "Sound reducing panel." Journal of the Acoustical Society of America 120, no. 6 (2006): 3448. http://dx.doi.org/10.1121/1.2409431.

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Wirt, Leslie S. "Sound absorbing panel." Journal of the Acoustical Society of America 83, no. 1 (January 1988): 403. http://dx.doi.org/10.1121/1.396200.

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Stoll, Werner, and Edgar Weiss. "Sound absorbing panel." Journal of the Acoustical Society of America 86, no. 6 (December 1989): 2475. http://dx.doi.org/10.1121/1.398388.

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Chen, Kean, and Gary H. Koopmann. "Active Control of Low-Frequency Sound Radiation From Vibrating Panel Using Planar Sound Sources." Journal of Vibration and Acoustics 124, no. 1 (July 1, 2001): 2–9. http://dx.doi.org/10.1115/1.1420197.

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Active control of low frequency sound radiation using planar secondary sources is theoretically investigated in this paper. The primary sound field originates from a vibrating panel and the planar sources are modeled as simply supported rectangular panels in an infinite baffle. The sound power of the primary and secondary panels are calculated using a near field approach, and then a series of formulas are derived to obtain the optimum reduction in sound power based on minimization of the total radiate sound power. Finally, active reduction for a number of secondary panel arrangements is examined and it is concluded that when the modal distribution of the secondary panel does not coincide with that of the primary panel, one secondary panel is sufficient. Otherwise four secondary panels can guarantee considerable reduction in sound power over entire frequency range of interest.
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Chenxi, L. I., H. U. Ying, and H. E. Liyan. "Exploration and optimization on the usage of micro-perforated panels as trim panels in commercial aircrafts." Noise Control Engineering Journal 68, no. 1 (January 20, 2020): 87–100. http://dx.doi.org/10.3397/1/37687.

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Micro-perforated panels (MPPs), as an alternative to porous materials for sound absorption, have been commonly used in electronic industries and aircraft engines but are barely used in aircraft cabins. The effect of MPPs on the sound insulation and absorption properties of aircraft cabin panels has been investigated in this article. Theoretical modeling has been conducted on an aircraft cabin panel structure with a trim panel replaced by an MPP trim panel, using the transfer matrix method and the classic MPP theory. It is indicated by the theoretical results that, although the sound transmission loss (STL) of the cabin panel with an MPP trim panel is lower than that with an un-perforated panel, the MPP trim panel can significantly enhance the sound absorption coefficient of the entire cabin panel structure. Based on the well-developed MPP theory, the sound absorption coefficient of an aircraft cabin panel with an MPP trim panel can be improved by optimizing the MPP's parameters at a specific frequency. Taking an engine frequency 273 Hz as an example, the optimization can increase the sound absorption coefficient to 1 by using the doublelayered MPPs. When the thermal acoustic insulation blanket is considered, although the STL of the proposed structure with double-layered MPP trim panels in a diffuse field is lower than those without MPP trim panels, the sound absorption in the cabin is significantly enhanced due to the double-layer MPP trim panel at the specific engine frequency and across all frequencies. The STL of the structure with double-layered MPP trim panels and TAIB can be higher than 40 dB from 880 Hz in a diffuse field, which implies its effectiveness as sound insulation structure in aviation industry. MPP trim panels provide a new idea for the design of aircraft cabin panels and areworthy of further research
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Dissertations / Theses on the topic "Sound panel"

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Sagers, Jason Derek. "Analog Feedback Control of an Active Sound Transmission Control Module." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2461.pdf.

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Goldstein, Andre L. "Control of Sound Transmission with Active-Passive Tiles." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27913.

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Nowadays, numerous applications of active sound transmission control require lightweight partitions with high transmission loss over a broad frequency range and simple control strategies. In this work an active-passive sound transmission control approach is investigated that potentially addresses these requirements. The approach involves the use of lightweight stiff panels, or tiles, attached to a radiating base structure through active-passive soft mounts and covering the structure surface. The resulting double-partition configuration was shown to have good high frequency passive isolation, but poor low frequency transmission loss due to the coupling of the tiles to the base vibration through the air gap. The low frequency transmission loss performance of the partition was increased by using the active mounts to cancel the local volume velocity of the tiles. The use of a decentralized control approach with independent single channel controllers for each tile facilitates the implementation of a multiple tile system in a large scale application. A coupled structural-acoustic model based on an impedance mobility matrix approach was formulated to investigate the potential performance of active-passive tile approach in controlling sound transmission through plates. The model was initially applied to investigate the sound transmission characteristics of a double-panel partition consisting of a single tile-plate configuration and then extended to model a partition consisting of multiple-tiles mounted on a plate. The system was shown to have significant passive performance above the mass-spring-mass resonance of the double-panel system. Both feedback and feedforward control approaches were simulated and shown to significantly increase the transmission loss of the partition by applying control forces in parallel with the mounts to reduce the tile normal velocity. A correspondent reduction in sound radiated power was obtained over a broad frequency range limited by the tile stiffness. The experimental implementation of the active-passive tile approach for the control of sound transmission through plates was also performed. Two main experimental setups were utilized in the investigations, the first consisting of a single tile mounted on a clamped plate and the other consisting of four active tiles mounted of a simply supported plate. Tile prototypes were implemented with lightweight stiff panels and integrated active-passive mounts were implemented with piezoelectric Thunder actuators. Both analog feedback and digital feedforward control schemes where designed and implemented with the objective of reducing the normal velocity of the tiles. Experimental results have demonstrated significant broad frequency range reductions in the sound transmission through the partition by active attenuation of the tile velocity. In addition, the experiments have shown that decentralized control can be successfully implemented for multiple tiles systems. The active-passive sound transmission control characteristics of the systems experimentally studied were observed to be in accordance with the analytical results.
Ph. D.
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Bianchi, Emanuele. "Smart panel with an array of decentralised control systems for active structural acoustic control." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274667.

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Davis, Nathan A. "Sound Absorptivity of Various Designs of 3-D Printed Acoustic Paneling." Youngstown State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1619960590635589.

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Jones, C. Mair A. "Scattering of sound by a semi-infinite sandwich panel perforated on one side." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46846.

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Mu, Rui Lin. "Improvement of Sound Insulation Performance of Multi-layer Structures in Buildings." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174914.

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Alujević, Neven. "Smart double panel with decentralised active damping units for the control of sound transmission." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/64537/.

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This thesis presents a comprehensive study of a smart aircraft double panel for active vibroacoustic control. The control of the double panel vibration is implemented using Multi-Input-Multi-Output (MIMO) decentralised velocity feedback loops. The loops are applied via an array of electrodynamic force actuators and collocated velocity sensors. The actuators are located in an air cavity between the two panels such that they can react against the two panels. Two velocity sensors per actuator are used. Either sensor is located at the source and radiating panel footprint of an actuator. The error velocity is formed by subtracting weighted sensor outputs. In the introductory part of the thesis a survey of aircraft interior noise is given, and stateof- the-art passive and active noise control methods are presented. In Chapter two the mathematical model for the theoretical analysis of the smart double panel is formulated and a parametric study of passive sound transmission is performed using the mathematical model. In Chapter three the performance of decentralised feedback control systems using absolute and relative velocity is analysed theoretically. In Chapter four the stability and performance of decentralised feedback control systems using reactive actuators driven with weighted velocity error signals is analysed theoretically. In Chapter five the stability of decentralised feedback control systems using weighted velocity error signals and electrodynamic reactive actuators is analysed experimentally. In Chapter six the performance of decentralised feedback control systems using weighted velocity error signals and reactive actuators is analysed experimentally.
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McLeod, Sharynne, S. Verdon, C. Bowden, and A. Lynn Williams. "Aspirations of an International Expert Panel for Working with Multilingual Children with Speech Sound Disorders." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/2057.

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Liu, Bilong. "Acoustical Characteristics of Aircraft Panels." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4102.

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Meng, Han. "Acoustic properties of novel multifunctional sandwich structures and porous absorbing materials." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC008/document.

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La mise en oeuvre de matériaux acoustiques est une méthode efficace et très utilisée pour réduire le bruit le long de sa propagation. Les propriétés acoustiques de nouvelles structures sandwich multifonctionnelles et de matériaux absorbants poreux sont étudiées dans la thèse. Les principales contributions de la thèse sont les suivantes: Les panneaux sandwich ont généralement d'excellentes propriétés mécaniques et un bon indice de perte en transmission sonore (STL), mais aucune capacité d'absorption acoustique. De nouvelles structures sandwich multifonctionnelles sont développées en intégrant des microperforations et des matériaux absorbants poreux aux panneaux sandwich ondulés et en nid d’abeilles conventionnels, structurellement efficaces pour obtenir de bons STL et de bonnes absorptions en basses fréquences. Le coefficient d'absorption acoustique (SAC) et la perte en transmission (STL) des panneaux sandwich ondulés sont évalués numériquement et expérimentalement en basse fréquence pour différentes configurations de perforations. Les modèles éléments finis (EF) sont construits en tenant compte des interactions vibro-acoustiques sur les structures et des dissipations d'énergie, visqueuse et thermique, à l'intérieur des perforations. La validité des calculs FE est vérifiée par des mesures expérimentales avec les échantillons testés obtenus par fabrication additive. Par rapport aux panneaux sandwich ondulés classiques sans perforation, les panneaux sandwich perforés (PCSPs) avec des perforations dans leur plaque avant présentent non seulement un SAC plus élevé aux basses fréquences, mais aussi un meilleur STL, qui en est la conséquence directe. L'élargissement des courbes des indices d’absorption et de transmission doit être attribué à la résonance acoustique induite par les micro-perforations. Il est également constaté que les PCSPs avec des perforations dans les plaques avant et les parois internes onduleés ont les fréquences de résonance les plus basses de tous les PCSPs. En outre, les performances acoustiques des panneaux sandwich en nid d'abeilles avec une plaque avant microperforée sont également examinées. Un modèle analytique est présenté avec l'hypothèse que les déplacements des deux plaques sont identiques aux fréquences inférieures à la fréquence de résonance des plaques. Le modèle analytique est ensuite validé par des modèles d'éléments finis et des résultats expérimentaux existants. Contrairement aux panneaux sandwich en nid d'abeilles classiques qui sont de piètres absorbeurs de bruit, les sandwichs en nid d'abeilles perforés (PHSPs) conduisent à un SAC élevé aux basses fréquences, ce qui entraîne en conséquence un incrément dans le STL basse fréquence. Les influences de la configuration du noyau sont étudiées en comparant les PHSPs avec différentes configurations de noyaux en nids d'abeilles. […]
Implementation of acoustic materials is an effective and popular noise reduction method during propagation. Acoustic properties of novel multifunctional sandwich structures and porous absorbing materials are studied in the dissertation. The main contributions of the dissertation are given as, Sandwich panels generally have excellent mechanical properties and good sound transmission loss (STL), but no sound absorption ability. Novel multifunctional sandwich structures are developed by integrating micro perforations and porous absorbing materials to the conventional structurally-efficient corrugated and honeycomb sandwich panels to achieve good SAC and STL at low frequencies. Low frequency sound absorption and sound transmission loss (STL) of corrugated sandwich panels with different perforation configurations are evaluated both numerically and experimentally. Finite element (FE) models are constructed with considerations of acousticstructure interactions and viscous and thermal energy dissipations inside the perforations. The validity of FE calculations is checked against experimental measurements with the tested samples provided by additive manufacturing. Compared with the classical corrugated sandwich panels without perforation, the perforated corrugated sandwich panels (PCSPs) with perforations in its face plate not only exhibits a higher SAC at low frequencies but also a better STL as a consequence of the enlarged SAC. The enlargement of SAC and STL should be attributed to the acoustical resonance induced by the micro perforations. It is also found that the PCSPs with perforations in both the face plates and corrugated cores have the lowest resonance frequencies of all the PCSPs. Besides, the acoustic properties of honeycomb sandwich panels with microperforated faceplate are also explored. An analytical model is presented with the assumption that displacements of the two faceplates are identical at frequencies below the faceplate resonance frequency. The analytical model is subsequently verified by finite element models and existing experimental results. Unlike classical honeycomb sandwich panels which are poor sound absorbers, perforated honeycomb sandwiches (PHSPs) lead to high SAC at low frequencies, which in turn brings about increment in the low frequency STL. Influences of core configuration are investigated by comparing PHSPs with different honeycomb core configurations. In order to enlarge the SAC bandwidth of perforated sandwich panels, porous absorbing materials are added to the cores of novel perforated sandwich panels. FE models are set up to estimate the SAC and STL of perforated sandwich panels with porous materials. Results show that perforated sandwich panels with porous material can provide SAC with broader bandwidth and lower resonance frequency than that without porous materials. Whereas the peak values in the SAC and STL curves are reduced due to the weakened acoustical resonance by the porous materials. […]
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Books on the topic "Sound panel"

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Mason, J. M. The use of acoustically tuned resonators to improve the sound transmisssion loss of double panel partitions. Southampton, England: University of Southampton, Institute of Sound and Vibration Research, 1986.

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Kruppa, P. Intercomparison of laboratory sound insulation measurements on window panes. Luxembourg: Commission of the European Communities, 1988.

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Stauffer, Todd. The complete idiot's guide to Macintosh OS 8.5. Indianapolis, Ind: Que Alpha Books, 1998.

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Organizational challenges in achieving sound financial management and audit readiness: Hearing before the Panel on Defense Financial Management and Auditability Reform of the Committee on Armed Services, House of Representatives, One Hundred Twelfth Congress, first session, hearing held September 15, 2011. Washington: U.S. G.P.O., 2011.

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Taylor, E. W. Theoretical and practical aspects of the "functional absorber" method of arranging sound absorbing panels. London: BBC, 1987.

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Council, Puget Sound Regional, and Puget Sound Regional Council. Forecasting and Growth Strategy Dept., eds. Puget Sound Transportation Panel survey, 1989-1994. [Seattle, Wash: The Council, 1996.

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Amazing Grace! How Sweet the Sound: 3 Panel Koinonia Reply. Broadman & Holman Publishers, 1998.

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North Puget Sound Long-Term Oil Spill Risk Management Panel., Washington (State). Spill Prevention, Preparedness, and Response Program., and United States. Coast Guard. District, 13th. Marine Safety Division., eds. North Puget Sound long-term oil spill risk management panel: Final report and recommendations. Olympia, Wash: North Puget Sound Long-term Oil Spill Risk Management Panel, Washington Department of Ecology, Spill Prevention, Preparedness and Response Program, 13th District United States Coast Guard, Marine Safety Division, 2000.

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Wauters, W. Manufacture of a Sound and Heat Insulating Panel by Using Regenerated Raw Materials: Demonstration Project. European Communities / Union (EUR-OP/OOPEC/OPOCE), 1989.

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North Puget Sound Long-Term Oil Spill Risk Management Panel., Washington (State). Dept. of Ecology., United States Coast Guard, and United States. Dept. of Transportation. Navigation Safety Advisory Council (NAVSAC), eds. North Puget Sound long-term oil spill risk management panel: Final report and recommendations, July 2000. [Olympia, Wash: The Panel, 2000.

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Book chapters on the topic "Sound panel"

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Murakami, Elaine, and Cyrus Ulberg. "The Puget Sound Transportation Panel." In Transportation Research, Economics and Policy, 159–92. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-2642-8_6.

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Lu, Tianjian, and Fengxian Xin. "Transmission of Sound Through Finite Multiple-Panel Partition." In Springer Tracts in Mechanical Engineering, 1–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55358-5_1.

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Tan, W. H., A. S. N. Amirah, S. Ragunathan, N. A. N. Zainab, A. M. Andrew, W. Faridah, and E. A. Lim. "Acoustical Analysis and Optimization for Micro-Perforated Panel Sound Absorber." In Lecture Notes in Mechanical Engineering, 587–98. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0866-7_50.

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Tan, Ben H., Anthony D. Lucey, and Richard M. Howell. "The Effect of Localised Stiffening on the Stability of a Flexible Panel in Uniform Flow." In Fluid-Structure-Sound Interactions and Control, 325–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40371-2_46.

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Peng, Cheng, Feng Xu, Wei Pan, Min Sun, and Yanghui Xu. "Calculation and Application of Sound Insulation of the Vehicle Dash Panel." In Lecture Notes in Electrical Engineering, 397–407. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3527-2_34.

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Elwaleed, A. K., N. Nikabdullah, M. J. M. Nor, M. F. M. Tahir, and R. Zulkifli. "Sound Absorption Properties of a Low Density Date Palm Fibers Panel." In Recent Trends in Nanotechnology and Materials Science, 63–76. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04516-0_6.

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Tsigklifis, K., and A. D. Lucey. "Global Stability Analysis of Blasius Boundary-Layer Flow over a Compliant Panel Accounting for Axial and Vertical Displacements." In Fluid-Structure-Sound Interactions and Control, 357–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48868-3_57.

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Prasittisopin, Lapyote, Kittisak Pongpaisanseree, Patiphat Jiramarootapong, and Chalermwut Snguanyat. "Thermal and Sound Insulation of Large-Scale 3D Extrusion Printing Wall Panel." In RILEM Bookseries, 1174–82. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49916-7_111.

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Hamaguchi, Nana, Keiko Yamamoto, Daisuke Iwai, and Kosuke Sato. "Subjective Difficulty Estimation for Interactive Learning by Sensing Vibration Sound on Desk Panel." In Lecture Notes in Computer Science, 138–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16917-5_14.

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Soni, Kirti, Mahavir Singh, and Yudhisther K. Yadav. "Sound Transmission Characteristics Through Multi-panel Structures of Wooden Doors and Uncertainty Components in the Measurements." In Recent Developments in Acoustics, 139–48. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5776-7_13.

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Conference papers on the topic "Sound panel"

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Khrystoslavenko, Olga, and Raimondas Grubliauskas. "Theoretical End Experimental Evaluation of Perforations Effect on Sound Insulation." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.027.

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To design a sound-absorbing panel, it is important to identify factors that affect the maximum sound absorption of low, middle and high frequency sounds. Perforation effect is very important for the noise-reducing and noiseabsorbing panels. Perforations are often used for sound reduction. Experimental data shows that the perforation is very effective to absorb low-frequency noise. In the presented study, influence of perforation coefficient of noise reduction was analyzed with theoretical and experimental methods. The experiments were conducted in noise reduction chamber using an perforated construction with glass wool filler. Sound reductions index of 15 dB indicates good acoustic properties of the panel.
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Bly, Sara A., Steven P. Frysinger, David Lunney, Douglass L. Mansur, Joseph J. Mezrich, and Robert C. Morrison. "Communicating with sound (panel session." In the SIGCHI conference, edited by William Buxton. New York, New York, USA: ACM Press, 1985. http://dx.doi.org/10.1145/317456.317477.

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Sagers, Jason, Jonathan D. Blotter, and Timothy W. Leishman. "Active Sound Transmission Control of an Experimental Double-Panel Partition Using Decoupled Analog Feedback Control." In ASME 2008 Noise Control and Acoustics Division Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ncad2008-73018.

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This paper addresses the construction, measurement, and analysis of a double-panel active partition (DPAP) and its accompanying analog feedback controllers. The DPAP was constructed by attaching an aluminum cone loudspeaker at each end of a short segment of a circular duct. Two analog feedback controllers were designed and built using the measured frequency response function of each panel. Two independent (decoupled) feedback controllers were then used to minimize the vibration amplitude of each panel in the presence of an acoustic disturbance. A normal-incidence transmission loss measurement system was used to assess the performance of the DPAP and of a single panel passive partition. Error signal attenuations show that it is both feasible and effective to simultaneously control both panels with decoupled feedback controllers, and that simultaneously controlling both panels of the DPAP has a distinct advantage over controlling a single panel. The reduction in vibration amplitude across the surface of the transmitting panel was confirmed with scanning laser vibrometer measurements. Transmission loss results were obtained for two passive and three active configurations. The average normal incidence transmission loss over the active measurement bandwidth (50–1,000 Hz) for the active double-panel was 60 dB. This is an average of 39 dB more transmission loss than a passive single panel partition.
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Robinson, Jay, Ralph Buehrle, Jacob Klos, and Ferdinand Grosveld. "Radiated Sound Power from a Curved Honeycomb Panel." In 9th AIAA/CEAS Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3156.

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Klos, Jacob, Jay Robinson, and Ralph Buehrle. "Sound Transmission Through a Curved Honeycomb Composite Panel." In 9th AIAA/CEAS Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3157.

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Wang, Chong, and Alan Parrett. "Damping Mass Effects on Panel Sound Transmission Loss." In SAE 2011 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-01-1633.

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Xie, Shi-lin, and Sheng-jiang Liu. "Sound transmission loss characteristics of single corrugated panel." In 2010 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA 2010). IEEE, 2010. http://dx.doi.org/10.1109/spawda.2010.5744296.

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Hemmatian, Masoud, and Ramin Sedaghati. "Sound Transmission Loss of Adaptive Sandwich Panels Treated With MR Fluid Core Layer." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9059.

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This study aims to investigate the sound transmission loss (STL) capability of sandwich panels treated with Magnetorheological (MR) fluids at low frequencies. An experimental setup has been designed to investigate the effect of the intensity of the applied magnetic field on the natural frequencies and STL of a clamped circular plate. A multilayered uniform circular panel comprising two elastic face sheets and MR fluid core layer is fabricated. It is shown that as the applied magnetic field increases, the fundamental natural frequency of the MR sandwich panel increases. Moreover, the STL of the panel at the resonance frequency considerably increases under applied magnetic field. Furthermore, an analytical model for the STL of the finite multilayered panels with MR core layer is developed and compared with the experimental measurements. The MR core layer is treated as a viscoelastic material with complex shear modulus. It is shown that good agreement exists between the analytical and experimental results. Parametric study has also been conducted to investigate the effect of face sheets and core layers’ thickness.
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De Fonseca, P., P. Sas, and H. Van Brussel. "Active Reduction of Sound Transmission Through a Double Panel Partition." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/movic-8438.

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Abstract The paper addresses the active control of the sound transmission through a double panel partition. A literature survey indicates that active cavity control is much more efficient than active structural control. The vibro-acoustic behaviour of the double wall is analysed in light of this observation. This analysis shows that the sound transmission through the double panel is larger than that through a single panel at the resonances of the coupled eigenmodes with the strongest vibro-acoustic coupling between the plate motion and the pressure in the cavity. At frequencies where the double panel radiates much sound energy, the acoustic energy in the cavity is also high. Active control simulations illustrate that the cavity control approach, reducing not only the uncoupled (0,0,0) mode, achieves a considerable reduction of the sound transmission over a large frequency band. Depending on the desired noise reduction, the complexity and the cost of the control system can be reduced by a proper diagonalisation of the controller and by a clustering of the sensors and the actuators.
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Drouin, Mary, Judith Gallman, and Ronald Olsen. "Sound Level Effect on Perforated Panel Boundary Layer Growth." In 12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-2411.

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