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Dissertations / Theses on the topic 'Sound transmission loss sound radiation'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Pavasovic, Vladimir, and vpavasovic@wmgacoustics com au. "The radiation of Sound from Surfaces at Grazing Angles of Incidence." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20060911.115939.

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It is difficult to predict the sound radiation from large factory roofs. The existing infinite panel theories of sound insulation are not sufficient when the sound radiates at grazing angles. It has been shown that the reason for the collapse of the theory is the well known result for the radiation efficiency. This research will present a simple analytic strip theory, which agrees reasonably well with numerical calculations for a rectangular panel. Simple analytic strip theory has lead to the conclusion that it is mainly the length of the panel in the direction of radiation, rather than its

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2

Cambridge, Jason Esan. "The Sound Insulation of Cavity Walls." Thesis, University of Canterbury. Mechanical Engineering, 2012. http://hdl.handle.net/10092/7332.

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Lightweight building materials are now commonly employed in many countries in preference to heavyweight materials. This has lead to extensive research into the sound transmission loss of double leaf wall systems. These studies have shown that the wall cavity and sound absorption material placed within the cavity play a crucial role in the sound transmission through these systems. However, the influence of the wall cavity on the sound transmission loss is not fully understood. The purpose of this research is to obtain a comprehensive understanding of the role played by the wall cavity and any

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3

Ramanathan, Sathish Kumar. "The effects of damping treatment on the sound transmission loss of honeycomb panels." Licentiate thesis, KTH, MWL Structural and vibroacoustics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12514.

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<p>In the industry, all passenger vehicles are treated with damping materials to reduce structure-borne sound. Though these damping materials are effective to attenuate structure-borne sound, they have little or no effect on the air-borne sound transmission.The lack of effective predictive methods for assessing the acoustic effects due to added damping on complex industrial structures leads to excessive use of damping materials.Examples are found in the railway industry where sometimes the damping material applied per carriage is more than one ton. The objective of this thesis is to provide a

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4

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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5

Phillips, Timothy Jason Nirmal. "Sound Transmission Loss of Sandwich Panels." Thesis, University of Canterbury. Department of Mechanical Engineering, 2012. http://hdl.handle.net/10092/9210.

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The sound transmission loss characteristics of plywood based sandwich panels were investigated. Measurements were made of the sound transmission loss of a range of materials and used as a baseline for comparison while a sound transmission loss optimisation method was developed. A unique test rig was built and calibrated to determine selected mechanical properties of materials of interest. The results of sound transmission loss and material properties measurements were used to select an appropriate prediction model, which was then used in conjunction with a mathematical optimisation model to de

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6

Cowan, Andre James. "Sound Transmission Loss of Composite Sandwich Panels." Thesis, University of Canterbury. Mechanical Engineering, 2013. http://hdl.handle.net/10092/7879.

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This thesis examines the sound transmission loss (STL) through composite sandwich panel systems commonly used in the marine industry. Experimental, predictive and optimisation methods are used to evaluate the acoustic performance of these systems and to improve their acoustic performance with noise treatment. The complex nature of the material properties of composite sandwich panels was found to be dependent not only on the physical properties but also the frequency of incident noise. Young’s modulus was found to reduce with increasing frequency as has been predicted in the literature which is

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7

Hannink, Marieke Henriëtte Cathrien. "Acoustic resonators for the reduction of sound radiation and transmission." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/58025.

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8

Sors, Thomas Christopher. "Active structural acoustic control of sound transmission through a plate." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326822.

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9

Wareing, Robin Richard. "Investigation and Prediction of the Sound Transmission Loss of Plywood Constructions." Thesis, University of Canterbury. Mechanical Engineering, 2015. http://hdl.handle.net/10092/10455.

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The sound transmission loss of a range of plywood panels was measured to investigate the influence of the orthotropic stiffness of the plywood panels. The plywood panels were tested as single and also double leaf partitions, with a range of stud configurations. A new method was developed for predicting the sound transmission loss of single leaf partitions with both orthotropic and frequency dependent stiffness values. The sound transmission loss was evaluated for two significantly different sample sizes. The observed influence of the sample size on the measured sound transmission loss was prof

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10

Thomas, Ashwin Paul. "Simulated and laboratory models of aircraft sound transmission." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52319.

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With increased exposure to transportation noise, there have been continued efforts to help insulate homes from aircraft noise. Current aircraft noise guidelines are based primarily on outdoor sound levels. As people spend the majority of their time indoors, however, human perception is evidently more related to indoor sound levels. Investigations are being made to provide further insight into how typical residential constructions affect indoor response. A pilot study has built a single-room "test house", according to typical construction for mixed-humid climate regions, and has directly measur

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11

Morgan, Julian Rees. "Selective estimation of sound pressure and intensity in determinations of transmission loss." Thesis, Liverpool John Moores University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253702.

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12

Wang, Bor-Tsuen. "Active control of sound transmission/radiation from elastic plates using multiple piezoelectric actuators." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/39956.

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13

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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14

GEORGE, JOHN K. "ANALYTICAL, NUMERICAL AND EXPERIMENTAL CALCULATION OF SOUND TRANSMISSION LOSS CHARACTERISTICS OF SINGLE WALLED MUFFLER SHELLS." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1181226367.

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15

Col, Stephen M. D. "Fine-scale variability in temperature, salinity, and pH in the upper-ocean and the effects on acoustic transmission loss in the Western Arctic Ocean." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FCol.pdf.

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Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, March 2010.<br>Thesis Advisor(s): Stanton, Tim ; Kapolka, Daphne. "March 2010." Description based on title screen as viewed on April 28, 2010. Author(s) subject terms: Acoustic propagation, transmission loss, Arctic Ocean, temperature salinity pH variability. Includes bibliographical references (p. 83-88). Also available in print.

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16

Rosi, Giuseppe. "Control of sound radiation and transmission by means of passive piezoelectric networks : modelling, optimization and experimental implementation." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00815038.

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Cette thèse a comme objet la réduction du rayonnement acoustique des structures minces par un réseau piézoélectrique passif. Une analyse détaillé des caractéristiques de rayonnement des structures minces est présenté, avec l'objectif d'utiliser ces caractéristiques pour l'optimisation de la structure intelligente. Deux stratégies de contrôle sont considérées: contrôle localisé et contrôle distribué. Le contrôle localisé utilise un réseau de actionneurs positionnés en des endroits optimisés, et le circuit est conçu pour concentré l'effort de contrôle dans la réduction de la puissance acoustique

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17

Ducret, Fabrice. "Studies of sound generation and propagation in flow ducts." Licentiate thesis, Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4049.

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18

Lane, Jeremy David. "Active Control of Noise Through Windows." Thesis, University of Canterbury. Mechanical Engineering dept, 2013. http://hdl.handle.net/10092/10523.

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Windows are a weakness in building facade sound transmission loss (STL). This coupled with the detrimental effects of excessive noise exposure on human health including: annoyance, sleep deprivation, hearing impairment and heart disease, is the motivation for this investigation of the STL improvements active noise control (ANC) of windows can provide. Window speaker development, ANC window experiments and analytical modelling of ANC windows were investigated. Five different window speaker constructions were characterised then compared with a previously developed window speaker. ANC window tes

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19

Mahn, Jeffrey. "Prediction of Flanking Noise Transmission in Lightweight Building Constructions: A Theoretical and Experimental Evaluation of the Application of EN12354-1." Thesis, University of Canterbury. Department of Mechanical Engineering, 2009. http://hdl.handle.net/10092/4426.

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The standard, EN12354-1 describes a simplified statistical energy analysis (SEA) model to predict the apparent sound reduction index between two rooms inclusive of the contributions of the flanking paths. There is interest worldwide in applying the EN12354 model to lightweight building elements. However, lightweight elements typically do not meet the requirements of an SEA subsystem and therefore applying the EN12354 model to these elements may result in inaccurate predictions. The purpose of this investigation was to systematically evaluate the application of the EN12354 model to lightweig

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20

Hornick, Heather René. "Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55299.

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Thesis (S.M.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and the Woods Hole Oceanographic Institution), 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 140-141).<br>A confluence of several coastal oceanographic features creates an acoustically interesting region with high variability along the New England Shelfbreak. Determining the effect of the variability on acoustic propagation is critical for sonar systems. In the Nantucket Shoals area of the Middle

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21

Andrade, Bruna Fuzzer de. "PADRÕES NORMATIVOS, ENSAIOS EXPERIMENTAIS E ANÁLISE DA PERFORMANCE ACÚSTICA DE TELHAS SANDUÍCHE." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/7920.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>In urban areas, where noise is significant, the facades and roofs must submit a performance capable of ensuring insulation required for the acoustic comfort of the users. The roof, although important elements of the envelope of buildings, has been little studied in Acoustics. The validity of ISO 15575 Residential Buildings - Performance impacted mainly the construction industry suppliers, who needed to characterize their products and systems. Also in 2015 came the NBR 16373 - tiles and thermoacoustic panels - Performance requirem

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22

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 d

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23

Radavelli, Graziella Ferrer. "AVALIAÇÃO DA PERDA DE TRANSMISSÃO SONORA EM PAREDES EXTERNAS DE LIGHT STEEL FRAME." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/7873.

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Environmental noise at high levels and inappropriate construction techniques used in conventional buildings in Brazil claim for a transition to better construction systems. Recently the Brazilian standard NBR 15575:2013 established for the first time parameters and criteria for residential building performance. In standard minimum requirements for sound insulation are given, for example for external walls and roof structures. This way it is of fundamental importance to have sound transmission loss data for diferente types of such elements at hand. Taking into account that there is very little

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24

Hara, Deniz. "Investigation Of The Use Of Sandwich Materials In Automotive Body Structures." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12614046/index.pdf.

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The use of sandwich structures in automobile body panels is investigated in this thesis. The applications on vehicles such as trains, aeroplanes and automobiles, advantages, isadvantages and modelling of sandwich structures are discussed and studies about static, vibrational and acoustic benefits of sandwich structures by several authors are presented. The floor, luggage, firewall and rear wheel panels in sheet metal form is replaced with panel made from sandwich materials in order to reduce the weight obtained by a trial and error based optimization method by keeping the same bending stiffne

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25

Zergoune, Zakaria. "Meso-macro approach for modeling the acoustic transmission through sandwich panels." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC048/document.

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La modélisation du comportement vibroacoustique en flexion des structures sandwich est devenue aujourd’hui de plus en plus d’un grand intérêt dans les différents secteurs industriels. Cette tendance est principalement due aux propriétés mécaniques avantageuses des structures sandwich. L’un des principaux avantages de ce type de structures réside principalement dans le rapport rigidité-poids élevé. En revanche, acoustiquement la diminution de la masse du panneau avec une rigidité élevée conduit à un confort acoustique insatisfait. Pour cette raison, il y a une demande croissante pour des approc

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26

De, Man Pierre. "Contrôle actif du rayonnement acoustique des plaques: une approche à faible autorité." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211180.

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L'objectif de cette thèse consiste en l'étude d'une stratégie de contrôle actif à faible autorité avec comme application le contrôle actif du rayonnement acoustique d'une plaque. Depuis l'essor du contrôle actif, son application aux problèmes acoustiques et vibracoustiques a été investiguée par de nombreux chercheurs, exploitant soit la théorie du contrôle optimal, soit des approches originales basées plus particulièrement sur la physique. Des notions spécifiques au contrôle vibroacoustique ont été développées comme, par exemple, les modes radiatifs pouvant caractériser le rayonnement acoustiq

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27

Mertens, Tanguy. "A new mapped infinite partition of unity method for convected acoustical radiation in infinite domains." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210365.

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Résumé:<p><p>Cette dissertation s’intéresse aux méthodes numériques dans le domaine de l’acoustique. Les propriétés acoustiques d’un produit sont devenues une part intégrante de la conception. En effet, de nos jours le bruit est perçu comme une nuisance par le consommateur et constitue un critère de vente. Il y a de plus des normes à respecter. Les méthodes numériques permettent de prédire la propagation sonore et constitue dès lors un outil de conception incontournable pour réduire le temps et les coûts de développement d’un produit.<p><p>Cette dissertation considère la propagation d’ondes ac

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28

Tiikoja, Heiki. "Acoustic Characterization of Turbochargers and Pipe Terminations." Licentiate thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92648.

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In search for quieter engines there is a need for a better understanding of the acoustic properties of engine intake and exhaust system components. Besides mufflers which have the purpose of reducing pressure pulses originating from the internal combustion (IC) engine, there are many components in a modern car exhaust and intake system, e.g., air-filters, coolers, catalytic converters, particulate filters - all having an effect on the pressure pulses or sound field in the system. In this work the focus is on the turbocharged IC-engine where both, sound scattering (reflection and transmission)

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29

Alimonti, Luca. "Développement d'une méthode hybride éléments finis-matrice de transfert pour la prédiction de la réponse vibroacoustique de structures avec traitements acoustiques." Thèse, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5988.

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Résumé : Les véhicules aériens et terrestres sont constitués de systèmes bâtis complexes. La structure principale est généralement composée de panneaux légers renforcés par des éléments rigides. Cette solution de conception est répandue parce qu’elle allie la force et un faible poids. Cependant, on sait qu’elle offre des résultats vibroacoustiques médiocres, c’est à dire que l’effet des perturbations externes qui touchent le système peut générer un niveau de bruit excessif à l’intérieur de la cabine des passagers. C’est une préoccupation majeure chez les fabricants, parce que ce niveau de brui

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30

Srinivasan, Vijay. "Mobility Analysis of Structure-borne Noise Paths in a Simplified Rotorcraft Gearbox System." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276884944.

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31

Guenfoud, Nassardin. "On the multi-scale vibroacoustic behavior of multi-layer core topology systems." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEC010.

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Les panneaux sandwichs en nid d'abeille ont fait l'objet d'intenses recherches ces dernières décennies. En effet, outre leurs bonnes performances mécaniques et leur rapport rigidité poids faible, il en résulte une baisse importante des propriétés acoustiques. Ainsi, de nombreux designs sont régulièrement proposés afin de palier à cette problématique. En parallèle, différents modèles sont développés afin de modéliser des structures de plus en plus complexes, en utilisant notamment les propriétés périodiques dans le but d’étudier la propagation des ondes. Cette dernière permet une étude approfon

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32

Brouard, Yoann. "Caractérisation et optimisation d'un composite biosource pour l'habitat." Thesis, Tours, 2018. http://www.theses.fr/2018TOUR4024.

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Cette étude a pour objet de comparer les propriétés acoustiques, mécaniques et hygrothermiques de différents biocomposites destinée à l’isolation des bâtiments à base de granulats issus de co-produits végétaux et d’un liant à base d’argile. Nous avons d’abord analysé les matières premières afin d’obtenir d’une part la masse volumique et les propriétés thermiques et hydriques des granulats végétaux et les caractéristiques minéralogiques et gravimétriques de la terre crue sélectionnée d’autre part. L’évolution de la conductivité thermique des mélanges terre:granulats végétaux a été étudiée à dif

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33

De, Mey Ann. "Sound transmission loss measurements by the sound intensity technique." Thesis, 1985. http://spectrum.library.concordia.ca/4275/1/ML23143.pdf.

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Li, Junping. "Development of a facility for studies on intensity based sound power and sound transmission loss measurements." Thesis, 1991. http://spectrum.library.concordia.ca/2994/1/MM64730.pdf.

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35

Chiang, GuangTing, and 蔣官廷. "Active Control of Sound Radiation from and Transmission through a Plate." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/13624318123435757520.

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碩士<br>國立臺灣大學<br>造船及海洋工程學研究所<br>87<br>This study is mainly to introduce the basic concept on the mechanism between the motion of a plate with 4 edges clamped and the sound power radiation from it. Meanwhile, this study also outlines both the concept of radiation modes and the active control technique by using volume velocity cancellation. Therefore, this study is first in experiment to evaluate the control performance when using volume velocity cancellation technique. Later on, we use a far-field microphone as a sensor for the measurement of the net volume velocity of a plate. Combining it with

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36

Hsiao, Po-Chien, and 蕭伯鍵. "Sound transmission loss characteristics for seven load-bearing lightweight calcium silicate partitions." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2datke.

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碩士<br>國立臺灣科技大學<br>建築系<br>106<br>The objective of this research is to investigate the sound transmission loss (TL) of 7 different lightweight load-bearing calcium silicate board (CSB) partitions. By using the ASTM E90 and ISO 10140 measurement standards, the effects of testing equipment and procedure and the physical and environmental conditions of the testing chambers can be minimized and controlled. To study the CSB layers, with the similar trends of transmission loss values, the range of sound transmission class (STC) results in 1 to 2 dB. For Rockwool displacement of ASTM 2+3 partition, the

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Elliston, Sean David. "Acoustic Analysis of R.E.E.L. Semi-Reveberant Sound Chamber." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10772.

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The Riverside Energy Efficiency Laboratory at Texas A&M University conducts sound quality testing for the Home Ventilating Institute. When the Home Ventilating Institute initially established their sound quality test, the semi-reverberant sound chamber to conduct the sound quality tests was built at the Riverside Energy Efficiency Laboratory. The Home Ventilating Institute created a standard to specify the procedure for sound quality testing. This standard contained high consideration for performance, reliability, and accuracy. The standard was based on several ANSI standards for sound tes

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Cazzolato, Ben. "Sensing systems for active control of sound transmission into cavities." 1999. http://hdl.handle.net/2440/37893.

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Driven by the need to reduce the sound transmitted into aircraft cabins from the power plant, this thesis investigates the active control of sound transmitted through a structure into coupled enclosures. In particular, it examines alternatives to conventional microphone and accelerometer error sensors. This study establishes a design framework for the development and analysis of an active noise control system which can be applied to any complex vibro-acoustic system. The design approach has focused on using techniques presently used in industry to enable the transfer of the active noise contro

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Brink, Maarten Cornelis. "Transient finite element simulations and experiments on active control of sound transmission loss through plates." Phd thesis, 2008. http://tuprints.ulb.tu-darmstadt.de/958/1/Brink-Dissertation-20080306-neu.pdf.

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In this thesis the sound transmission loss of a plate has been investigated. It serves as an abstract model for the noise barrier between engine and passengers in a bus. A finite element simulation model has been developed to be able to predict the plate's noise reduction effect. To increase this reduction without adding too much mass, the integration of active noise control (ANC) has been investigated. The active system contained a controller, microphones and piezoelectric actuators. The influence of this system on the plate's transmission loss has been determined for three noise types: rando

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Brink, Maarten Cornelis [Verfasser]. "Transient finite element simulations and experiments on active control of sound transmission loss through plates / vorgelegt von Maarten C. Brink." 2008. http://d-nb.info/988174421/34.

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Vengala, Kalyan Chakravarthy. "Building a modified impedance tube for measurement of sound transmission loss and absorption coefficients of polymer cross-linked aerogel core composites." 2009. http://digital.library.okstate.edu/etd/Vengala_okstate_0664M_10589.pdf.

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ZHONG, MENG-XUN, and 鍾孟勳. "Study on the sound insulation of the openings of external walls in the buildings-- the influences of the transmission loss by varying the structural factors of the windows." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/17167655718416709044.

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