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Gotowa bibliografia na temat „Acoustical insulation”

Autor: Grafiati

Data publikacji: 29 lipca 2024

Data aktualizacji: 31 lipca 2024

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Artykuły w czasopismach na temat "Acoustical insulation"

Bao, Xue Fang. "Human Resident Acoustical Environment and Acoustical Insulation of Residential Building". Applied Mechanics and Materials 368-370 (sierpień 2013): 435–40. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.435.

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The development of economytraffic and industry have brought worse noise-pollution of city residences environment,the human residing acoustical environment quality is getting worse ,the development of green residential acoustical environment is extremely urgent .Dwelling houses sound insulation ability is one of important index of its quality. This text aim at the sound insulation problem because of light-weight wall being used at large, analyze the principle of sound insulation and optimize it ,briefly introduce the construction project of dwelling house sound insulation of light-weight wall by experiment contrast, expatiate on the technology measure of improving performance of light-weight wall.

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Moussa, Tala, Chadi Maalouf, Christophe Bliard, Boussad Abbes, Céline Badouard, Mohammed Lachi, Silvana do Socorro Veloso Sodré i in. "Spent Coffee Grounds as Building Material for Non-Load-Bearing Structures". Materials 15, nr 5 (24.02.2022): 1689. http://dx.doi.org/10.3390/ma15051689.

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The gradual development of government policies for ecological transition in the modern construction sector leads researchers to explore new alternative and low environmental impact materials with a particular focus on bio-sourced materials. In this perspective, the mechanical, thermal insulation, and the sound absorption performances of a spent coffee grounds/potato starch bio-based composite were analyzed for potential application in buildings. Based on thermal conductivity and diffusivity tests, the coffee grounds waste biocomposite was characterized as an insulating material comparable with conventional thermal insulation materials of plant origin. Acoustical tests revealed absorption coefficients in the same range as other conventional materials used in building acoustical comfort. This bio-sourced material presented a sufficient compressive mechanical behavior for non-load-bearing structures and a sufficient mechanical capacity to be shaped into building bricks. Mechanical, thermal, and acoustic performances depend on the moisture environment. The groundwork was laid for an initial reflection on how this composite would behave in two opposite climates: the continental climate of Reims in France and the tropical climate of Belém in Brazil.

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Dlhý, Dušan, i Peter Tomašovič. "Effects of the Sound Insulation of the Outer Structure on the Price". Applied Mechanics and Materials 820 (styczeń 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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Dlhý, Dušan, i Peter Tomašovič. "Sound Insulation Determination of Door". Advanced Materials Research 1057 (październik 2014): 215–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1057.215.

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The structural complexity of a door causes difficulties in the description of its behavior from an acoustical point of view. In many cases, even a small change can cause a big difference in its sound-isolating properties. To determine the acoustical quality of a door, it is important to perform laboratory measurements of the door structure and door frame, the gaps including. A mathematical analysis based on experimental measurements of the sound reduction index of several door constructions was used to determine the acoustical door categories. The equations for calculating the sound reduction index, which were introduced in this paper, should help in the design of a suitable door from an acoustical point of view.

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Rawlinson, R. D. "Acoustic Design of Lightweight Gas Turbine Enclosures". Journal of Engineering for Gas Turbines and Power 113, nr 4 (1.10.1991): 544–49. http://dx.doi.org/10.1115/1.2906275.

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Acoustic enclosures for the gas turbine industry have to comply with a number of stringent safety requirements including structural strength, fire resistance, and sound insulation. This has led traditionally to heavy enclosure designs. Corrugated enclosure panels offer significant structural advantages because of their increased bending stiffness. Consequently, a corrugated panel of a given thickness can give the same structural strength as a flat panel of substantially greater weight and thickness. However, corrugated panels are intrinsically less effective as a sound insulator than flat panels of the same thickness. This paper examines the implications of corrugated, lightweight panels for acoustic enclosures. It illustrated that, by careful design, the inherent acoustical disadvantages of corrugated panels can be overcome so that thinner, lighter, and more cost-effective enclosures can be used without compromising the overall structural and acoustical design requirements.

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da Silva Wunderlich, Priscila, Carolina Monteiro i Juan de Frias Pierrard. "Interlaboratory and proficiency tests for buildings sound insulation field measurements in Brazil - 4th Edition 2020". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, nr 2 (1.08.2021): 4743–54. http://dx.doi.org/10.3397/in-2021-2824.

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Since 2013 ABNT NBR 15575:2013 entered into force in Brazil, a national technical standard that establishes acoustic requirements for dwellings, that can be verified by means of field measurements procedures performed according to specific ISO standards. Therefore, those requirements have fostered the acoustic field measurement market, and the number of laboratories has quickly increased across the county. ProAcústica - Brazilian Association for Acoustical Quality, a non-profit entity, aiming to improve the quality of the acoustics business in Brazil has organized in 2020 the fourth edition of the "Interlaboratory program of field measurements for building acoustics laboratories - INTERLAB Program". This consists of a fundamental tool for acoustic field laboratories to evaluate and verify the quality of their measurement results. This paper presents the methodologies and procedures used in the interlaboratory program, as well as the results of both the interlaboratory test and the proficiency carried out in São Paulo (Brazil) during 2017 by ProAcústica - Brazilian Association for Acoustical Quality. In this edition a total number of 25 laboratories have participated (32% more participants than the last edition in 2017) for different type of field tests: airborne sound insulation, airborne facade sound insulation, impact sound level, sound pressure level from service equipment in buildings, and reverberation time). The main objectives are the evaluation of the precision of the field test methods in the Brazilian market, and the analysis of the performance of the participating laboratories as a quality control tool.

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Yuen, K. C. Gary, B. K. David Yeung, K. F. Calvin Chiu i C. M. Tony Cheng. "Applications of ventilation-enabling sound insulation devices based on mock-up test findings". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, nr 5 (30.11.2023): 3636–42. http://dx.doi.org/10.3397/in_2023_0515.

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Road traffic, railway and industrial noise sources are main challenges in maintaining satisfying acoustical environment for living habitat in Hong Kong. Ventilation-enabling sound insulation devices has been introduced to Hong Kong residential development in the aim of striking a good balance between indoor ventilation and sound insulation. In the form of windows and balconies, the sound insulation devices were applied to mitigate the potential road traffic, railway, and fixed noise impacts. The sound insulation performances of the devices were verified in a 1:1 mock-up test and indicated by in-out difference, which contributed from the outdoor and indoor noise levels. The in-out difference of the sound insulation devices varies with the adopted spectrum, depending on flat layout configurations. The enhancing performance of applied acoustic material to the sound insulation devices, and that of applied acoustic fin adjacent to the devices are also studied.

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Dlhý, Dušan. "The Effect of Free Joints on Sound Insulation of Constructions". Advanced Materials Research 855 (grudzień 2013): 233–36. http://dx.doi.org/10.4028/www.scientific.net/amr.855.233.

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Noise protection of a building ́s interior is one of the fundamental functions of building constructions. These constructions can be understood as internal partitions, ceilings or external wall-/roof claddings. However, walls often consist of basic building materials and openings; such windows and doors as well as the acoustical properties of such structures are determined by both parts (e.g., a windows and the wall structure). The acoustical quality of opening is in general affected not only by the particular structure, but also by the concept of the mounting. Acoustical requirements should be applied in all its parts, such as the construction of the window (door) frame, window (door) wing and the realization of the functional gap as well as by application of a sealant. On the base of experimental measurements in Acoustics Chambers of the Faculty of Civil Engineering of Slovak Technical University and mathematical analysis we have determined index of sound insulation of free joint.

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Nurzyński, Jacek. "Acoustical assessment of urban residential environment". Budownictwo i Architektura 13, nr 4 (9.12.2014): 033–40. http://dx.doi.org/10.35784/bud-arch.1690.

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The quality of urban residential environment depends on several factors, acoustical conditions are among the most important. Outdoor noise affects conditions inside the building, determines required sound insulation of external walls and the whole building envelope. It defines the comfort level on balconies and terraces, and also the quality of the closest building surroundings. Recent tendencies in spatial planning, related to the sustainable development idea, as rational land use, densification of existing built-up areas, revitalization of city centers etc, have possible far-reaching acoustical consequences. Besides, the environmental management and spatial planning present quite different attitude towards assessment of residential areas in terms of acoustics. The paper examines the problem of noise just from the perspective of spatial planning and building industry. The acoustic classification scheme is proposed for residential areas. It gives clear rules for acoustical planning and appropriate urban development policy. It is also an applicable tool for investors, developes, local authorities, and above all a final user to assess real quality and adequate value of the premises.

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Herreman, Kevin. "Modeling Industrial Pipe Insulation Performance". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, nr 5 (1.08.2021): 1548–54. http://dx.doi.org/10.3397/in-2021-1868.

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Reducing industrial noise emission utilizing jacketed pipe insulation is critical to reducing noise in industrial spaces. The ISO 15665 standard defines a testing process for measurement of the acoustical performance of installed and jacketed pipe insulation systems. However, the cost of testing per this standard, especially when using an external laboratory, can be very costly. That makes the development of a model to accurately estimate the performance of single, and multilayered, jacketed pipe insulation highly desirable. Utilizing a one-dimensional theoretical acoustic model along with empirical data, a model with sufficient accuracy to provide insertion loss results relative to the ISO 15665 standard was created. The creation and resulting functionality of the model for determining jacketed pipe insulation insertion loss and comparison of the resulting data to test results will be discussed herein.

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Rozprawy doktorskie na temat "Acoustical insulation"

Nguyen, Quyet D. [Verfasser], Reimund [Akademischer Betreuer] Gerhard i Ronald [Akademischer Betreuer] Plath. "Electro-acoustical probing of space-charge and dipole-polarization profiles in polymer dielectrics for electret and electrical-insulation applications / Quyet Doan Nguyen ; Reimund Gerhard, Ronald Plath". Potsdam : Universität Potsdam, 2019. http://d-nb.info/1218405678/34.

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Nguyen, Quyet Doan [Verfasser], Reimund [Akademischer Betreuer] Gerhard i Ronald [Akademischer Betreuer] Plath. "Electro-acoustical probing of space-charge and dipole-polarization profiles in polymer dielectrics for electret and electrical-insulation applications / Quyet Doan Nguyen ; Reimund Gerhard, Ronald Plath". Potsdam : Universität Potsdam, 2019. http://d-nb.info/1218405678/34.

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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 associated sound absorption material on the sound transmission loss through double leaf wall systems. The research was justified by the fact that some of the existing prediction models do not agree with some observed experimental trends. Gösele’s theory is expanded and used in the creation of an infinite and finite vibrating strip model in order to acquire the desired understanding. The sound transmission loss, radiated sound pressure and directivity of double leaf systems composed of gypsum boards and glass have been calculated using the developed model. A method for calculating the forced radiation efficiency has also been proposed. Predictions are compared to well established theories and to reported experimental results. This work also provides a physical explanation for the under-prediction of the sound transmission loss in London’s model; explains why Sharp’s model corresponds to Davy’s with a limiting angle of 61° and gives an explanation for Rindel’s directivity and sound transmission loss measurements through double glazed windows. The investigation also revealed that a wide variety of conclusions were obtained by different researchers concerning the role of the cavity and the properties of any associated sound absorption material on the sound transmission loss through double wall systems. Consequently recommendations about the ways in which sound transmission through cavity systems can be improved should always be qualified with regard to the specific frequency range of interest, type of sound absorption material, wall panel and stud characteristics.

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Öqvist, Rikard. "Variations in sound insulation in lightweight timber constructions". Licentiate thesis, Luleå tekniska universitet, Drift, underhåll och akustik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26446.

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This licentiate thesis deals with the topic of variations and uncertainties in building acoustic parameters for lightweight timber constructions. A higher safety margin to the legal requirements is needed to compensate for acoustical uncertainties, which leads to higher costs. Building costs can be reduced if the variations can be identified and controlled. The project was limited to industrially prefabricated timber frame based volumes and massive timber based plate elements. This thesis is based on the work reported in three papers (A, B and C). In paper A, the variations in impact and airborne sound insulation were assessed and quantified in 30 nominally identical volume built apartments in a four-storey building. Large variations were found and the underlying causes were investigated. A statistically significant difference between floor numbers was found as the highest floor achieved better sound insulation. This difference was assumed to be caused by the higher static load on lower floors affecting the elastic layer used to structurally connect the apartments. In paper B, three room volumes were followed and measured at different stages of completion throughout the construction process. The objective was to test if acoustical deviations in the field can be identified at earlier construction stages. An ISO tapping machine was used to excite the floors and the response was measured at 20 positions. The airborne and impact sound insulation were measured in the finished building. Deviations were found, but these could not be traced to earlier stages of completion. In Paper C, the variations in sound insulation of a cross-laminated timber (CLT) building system was investigated. The construction was based on prefabricated wall and floor plate elements which were mounted at the building site. A number of acoustical uncertainties related to the measurement procedure were also investigated. The measurement uncertainty was small in comparison to the total variations. The degree of prefabrication for the CLT system was lower compared to the volume system, which indicated a greater scope for poor workmanship. All papers indicate a higher sound insulation on the upper floors in a building. It is therefore important to carefully design the elastic layer between floor numbers. The measurement uncertainty has been continuously considered in this thesis. In order to properly identify and quantify variations, the measurement uncertainty should be minimised. Advantages and drawbacks with different measurement methods and directions for future research are discussed in the concluding chapters.
Godkänd; 2010; 20101110 (ricokv); LICENTIATSEMINARIUM Ämnesområde: Teknisk akustik/Engineering Acoustics Examinator: Professor Anders Ågren, Luleå tekniska universitet Diskutant: Teknologie doktor Christian Simmons, Simmons akustik & utveckling AB, Göteborg Tid: Torsdag den 16 december 2010 kl 13.00 Plats: F719 Taylor, Luleå tekniska universitet

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Forsman, Jimmy. "Game engine based auralization of airborne sound insulation". Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149498.

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Describing planned acoustic design by single number ratings yields a weak link to the subjective event, especially when the single number ratings are interpreted by others than experienced acousticians. When developing infrastructure, tools for decision making needs to address visual and aural perception. Visual perception can be addressed using game engines and this has enabled the establishment of tools for visualizations of planned constructions in virtual reality. Audio engines accounting for sound propagation in the game engine environment are steadily developing and have recently been made available. The aim of this project is to simulate airborne sound insulation by extending the support of recently developed audio engines directed towards virtual reality applications. The case studied was airborne sound insulation between two adjacent rooms in a building, the sound transmitted to the receiving room through the building structure resulting from sound pressure exciting the structural elements in the adjacent source room into vibration. The receiving room composed modelled space in the game engine Unreal Engine and Steam Audio was the considered audio engine. Sound transmission was modelled by filtering based on calculations of transmission loss via direct and flanking paths using the model included in the standard EN 12354-1. It was verified that the filtering technique for modelling sound transmission reproduced attenuations in correspondence with the predicted transmission loss. Methodology was established to quantify the quality of the audio engine room acoustics simulations. A room acoustics simulation was evaluated by comparing the reverberation time derived from simulation with theoretical predictions and the simulated reverberation time showed fair agreement with Eyring’s formula above its frequency threshold. The quality of the simulation of airborne sound insulation was evaluated relating the sound field in simulation to insulation classification by the standardized level difference. The spectrum of the simulated standardized level difference was compared with the corresponding sound transmission calculation for a modelled scenario. The simulated data displayed noticeable deviations from the transmission calculation, caused by the audio engine room acoustics simulation. However, the simulated data exhibited cancellation of favourable and unfavourable deviations from the transmission calculation resulting in a mean difference across the spectrum below the just noticeable difference of about 1 dB. Single number ratings was compared and the simulated single number rating was within the standard deviation of how the transmission model calculates predictions for a corresponding practical scenario measured in situ. Thus, the simulated data shows potential and comparisons between simulated data, established room acoustics simulation software and in situ measurements should further be made to deduce whether the deviations entails defects in the airborne sound insulation prediction or is an error imposed by the audio engine room acoustics simulation.

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Přikrylová, Pavlína. "Vývoj tepelně izolačních materiálů na bázi odpadních textilních vláken". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265439.

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The increasing quantity of waste represents serious environmental, social and economic problem. Wastes produced from industry and households. A large part of the economy transforms a certain amount of raw materials to waste in their production, because it is currently emphasis is placed on finding sustainable sources of raw materials. One of the suitable secondary raw materials can be discarded textiles or waste from the textile industry. These kinds of textile waste often ends up in landfills or incinerators, so it is from an ecological and environmentally advantageous to their further use. The diploma thesis deals with the study and development of thermal and acoustic insulation materials based on textile fibers. It focuses on the legislative requirements for waste management for the sorting of textile wastes and their subsequent modification before reuse. Further it contains kinds of textile fibers and bonding technologies thermal and acoustic insulation materials. Finally, an evaluation of thermal insulation, acoustic and mechanical properties of fibrous insulation materials.

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Shi, Wanqing. "Assessing and modelling impact sound insulation of wooden joist constructions". Licentiate thesis, Luleå tekniska universitet, 1995. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26012.

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Impact sound insulation is one of the most important aspects when assessing sound insulation of floor constructions in buildings. For assessing the impact sound insulation of aconstruction, a standard tapping machine is used as a sound source. However, the use of the current standard tapping machine has been criticised, especially with regard to measurement of wooden joist floors since the noise spectrum generated by a tapping machine differs from the spectrum generated by actual footfall. There are insufficient low frequency components in the noise spectrum produced by the tapping machine and it does not, therefore, accurately reflect low frequency noise from the construction.Reduce impact sound level from wooden joist floors are the main object of our study. It is important to be able to predict the sound insulation properties of wooden joist constructions at the design stage. To reduce the noise level in the receiving room, the input power transmitted through the construction must be estimated where the appropriate sound- and vibration-insulation can be designed.This study has investigated the waveform and frequency spectra of human footfall (walking, rum- ingand jumping); of the dropping of sand balls, sand bags and tires; and of the standard tapping machine. The impact sound power radiation from a wooden joist construction while applying different impact sources, such as actual footfall and the standard tapping machine, have also been studied.Research was also carried out regarding the development of a practical impact sound insulation calculation method for wooden joist floor constructions. The characteristics with regard to mechanical properties of floor construction was calculated using the impedance method. The impact sound level inside the sound receiving room was determined. The method developed can predict the basic performance of the wooden floor structure when excited by impact sounds.
Godkänd; 1995; 20070108 (biem)

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Bernstein, Joseph Barry. "Electrical characterization of polymeric insulation by electrically stimulated acoustic wave measurements". Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/54340.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
Includes bibliographical references (leaves 207-211).
by Joseph Barry Bernstein.
Ph.D.

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Mojolla, Roberto 1971. "Fonte geradora de impacto padronizado : construção e qualificação". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/257890.

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Orientador: Stelamaris Rolla Bertoli
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-27T02:02:34Z (GMT). No. of bitstreams: 1 Mojolla_Roberto_M.pdf: 4732831 bytes, checksum: e5a198764e38a4eea41b14c8e3fbcaa0 (MD5) Previous issue date: 2015
Resumo: Uma das queixas mais frequentes entre moradores de edifícios residenciais é o incomôdo causado por ruídos de impactos nos sistemas piso-teto decorrentes do caminhar ou quedas de objetos. Segundo as normas nacionais e internacionais, avaliar o desempenho acústico destes sistemas depende do uso de equipamentos normalizados e certificados. Para atender aos métodos de avaliação do desempenho acústico sugerido pelas normas, é necessário importar grande parte dos equipamentos recomendados, causando transtornos de diversas ordens. A avaliação da isolação acústica de pisos submetidos a impactos depende do uso de uma fonte de impacto padronizado (Standard Tapping Machine). Este é o equipamento padronizado para excitação de pisos na avaliação do nível de pressão sonora de impactos. A norma NBR 15575-3 (2013) indica a utilização do método de medição e avaliação do desempenho acústico de pisos com relação ao ruído de impactos proposto pela ISO 140-7 (1998) e ISO 717-2 (2013). No anexo A da norma ISO 140-7 (1998) são descritas as características e funções que a máquina de impacto padronizado deve cumprir. Esta pesquisa teve como objetivo construir e qualificar para uso uma fonte sonora de impacto padronizado. Para construção da fonte, observando as indicações do Anexo A da norma ISO 140-7 (1998), as partes que compõem o equipamento foram desenhadas, confeccionadas e montadas. Para qualificar o protótipo da fonte foram realizadas medidas em campo do nível de pressão sonora de impacto em sistemas piso-teto compartilhado em edifícios, conforme recomendado pela norma NBR 15575-3 (2013), empregando uma máquina de impactos comercial e repetindo o procedimento com o protótipo construído. A comparação dos níveis de pressão sonora de impacto padronizado, obtidos em função de frequências, validou numericamente a utilização do protótipo nas medições em campo realizadas. Estas medições quantificaram e qualificaram o isolamento sonoro oferecido pelos sistemas piso-teto ensaiados com relação ao ruído de impacto. Foram incorporadas inovações ao protótipo por meio da adoção de rolamentos lineares como guias para queda dos martelos e a inserção de peças resilientes sobre os contados de elevação dos martelos, reduzindo a emissão de ruído aéreo de funcionamento
Abstract: One of the most frequent complaints among inhabitants of residential buildings is the annoyance caused by noise impacts in the floor-ceiling systems resulting from walking or falling objects. According to national and international standards, assess the acoustic performance of these systems depends on the use of standardized and certified equipment. To meet the methods of assessing the acoustic performance suggested by the standards it is necessary to import most of the recommended equipment, causing disturbances of several orders. Assessment of acoustic insulation flooring subjected to impacts depends on use of a standardized source of impacts (Standard Tapping Machine). This is the standard equipment for floors excitation in the evaluation of sound pressure level impacts. The NBR 15575-3 (2013) indicates the use of the method of measurement and evaluation of acoustic performance levels with respect to noise impacts proposed by the ISO 140-7 (1998) and ISO 717-2 (2013). In Annex A of ISO 140-7 (1998) the features and functions are described that the machine must meet standardized impacts. This research aimed to construct and qualify to use a sound source of standardized impacts. For construction of the source, checking the indications in Annex A of ISO 140-7 (1998), the component parts of the equipment are designed, made and assembled. To qualify the prototype of the source were carried out measures in the field of sound pressure level of impact in floor-ceiling shared systems in buildings, as recommended by the standard 15575-3 (2013), using a commercial impact machine and repeating the procedure with the prototype built. Comparison of sound pressure levels of standardized impacts, obtained as a function of frequency, numerically validated the use of the prototype in measurements performed in the field. These measurements quantify and qualify the sound insulation provided by floor-ceiling systems tested with respect to the impact of noise. Innovations were incorporated into the prototype through the adoption of linear bearings as guides for the fall of the hammers and the inclusion of resilient pieces on the numbered elevation of hammers, reducing the emission of airborne noise operation
Mestrado
Arquitetura, Tecnologia e Cidade
Mestre em Arquitetura, Tecnologia e Cidade

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Mahasaranon, Sararat. "Acoustic and thermal properties of recycled porous media". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5516.

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This thesis is concerned with developing porous materials from tyre shred residue and polyurethane binder for acoustic absorption and thermal insulation applications. The resultant materials contains a high proportion of open, interconnected cells that are able to absorb incident sound waves through viscous friction, inertia effects and thermal energy exchanges. The materials developed are also able to insulate against heat by suppressing the convection of heat and reduced conductivity of the fluid locked in the large proportion of close-cell pores. The acoustic absorption performance of a porous media is controlled by the number of open cells and pore size distribution. Therefore, this work also investigates the use of catalysts and surfactants to modify the pore structure and studies the influence of the various components in the chemical formulations used to produce these porous materials. An optimum type and amounts of catalyst are selected to obtain a high chemical conversion and a short expanding time for the bubble growth phase. The surfactant is used to reduce the surface tension and achieve a homogenous mixing between the solid particulates tyre shred residue, the water, the catalyst and the binder. It is found that all of the components significantly affect the resultant materials structure and its morphology. The results show that the catalyst has a particularly strong effect on the pore structure and the ensuing thermal and acoustical properties. In this research, the properties of the porous materials developed are characterized using standard experimental techniques and the acoustic and thermal insulation performance underpinned using theoretical models. The important observation from this research is that a new class of recycled materials with pore stratification has been developed. It is shown that the pore stratification can have a positive effect on the acoustic absorption in a broadband frequency range. The control of reaction time in the foaming process is a key function that leads to a gradual change in the pore size distribution, porosity, flow resistivity and tortuosity which vary as a function of sample depth. It is shown that the Pade approximation is a suitable model to study the acoustic behaviour of these materials. A good agreement between the measured data and the model was attained.

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Książki na temat "Acoustical insulation"

Holger, Rindel Jens, i Lord P. (Peter), red. Environmental and architectural acoustics. Wyd. 2. London: Spon Press, 2011.

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P, Lord, red. Environmental and architectural acoustics. London: E & FN Spon, 1994.

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Mommertz, Eckard. Acoustics and sound insulation: Principles, planning, examples. Basel: Birkhäuser/Edition Detail, 2009.

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Institution, British Standards. Acoustics: Rating of sound insulation in buildings and of building elements. London: B.S.I., 1997.

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Institution, British Standards. Acoustics: Rating of sound insulation in buildings and of building elements. London: B.S.I., 1997.

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Bobran, Hans W. Handbuch der Bauphysik: Berechnungs- und Konstruktionsunterlagen für Schallschutz, Raumakustik, Wärmeschutz, Feuchteschutz. Wyd. 6. Braunschweig: Vieweg, 1990.

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Wayman, James L. Effect of sealants of the sound adsorption coefficients of acoustical friable insulating materials: By James L. Wayman and Mary K. Lory. Monterey, California: NavalPostgraduate School, 1985.

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Thermal and Acoustic Insulation of Piping, Tanks and Vessels (Seminar) (1989 Tara Hotel, London). Thermal and acoustic insulation of piping, tanks and vessels: Seminar Thursday 15 June 1989 at the Tara Hoetel, London : papers. London: Rubber and Plastics Institute, 1989.

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Zhu, Daming. The detection of partial discharge in high voltage insulating materials, cable and cable terminations using acoustic emission techniques. Manchester: University of Manchester, 1996.

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Hopkins, Carl. Sound Insulation. Taylor & Francis Group, 2015.

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Części książek na temat "Acoustical insulation"

Covrig, Alexandra, i G. Heyes. "ANIMA Noise Platform and ANIMA Methodology: One-Stop Shop for Aviation Noise Management". W Aviation Noise Impact Management, 297–308. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91194-2_12.

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AbstractWhen you think about aviation noise, you might imagine an airplane taking off. When you think about decreasing aviation noise, the first thing that usually comes up in one’s mind are the new silent plane engines. This makes perfect sense, but it does not fully grasp the issue of aviation noise. The ANIMA project is based on a holistic approach to aviation noise, as it focuses on non-acoustical factors as well. Annoyance, as perceived by local communities surrounding airports, also depends on non-acoustical factors, which can be situational (time of the day, day of the week, activity performed while exposed to noise) and personal (sensitivity to noise, attitudes, noise insulation).

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Heidemann, Lucas, Jochen Scheck i Berndt Zeitler. "Impact Sound Insulation of Thermally Insulated Balconies". W iCity. Transformative Research for the Livable, Intelligent, and Sustainable City, 359–71. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92096-8_23.

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AbstractWith the increasing urban densification, balconies are gaining in popularity as they improve the living quality in homes. From a technical point of view, the thermal insulation between balconies and the building’s façade is state of the art. In Germany, the most popular balcony construction is a reinforced concrete balcony, separated from the building by a thermal insulation element (TIE), which is meant to reduce the thermal energy loss and thus ensure the sustainability of intelligent buildings. The impact sound transmission from balconies, however, is a problem that has not been addressed enough to date. The paper is based on a project of the same name within the iCity research with the main goal of providing acoustic quantities, e.g. an impact sound pressure level difference, for a TIE that can be used to compare the acoustical quality of products and used to predict the impact sound pressure levels within the building using the standard EN ISO 12354-2. Experimental and numerical studies have been carried out on various ceiling-balcony mock-ups without and with TIEs, e.g. by means of experimental modal analysis and validated finite element models, respectively. These studies showed that even doubling the width of the ceiling-balcony mock-up does not change the results significantly, suggesting that the proposed test set-up is suitable for standard testing. The analysis method and results presented here are for only one test set-up with and without a TIE that underwent constructive modifications during the tests. The selected TIE shows an effective sound insulation above 400 Hz and achieves a single-number rated impact sound level difference of $$ \Delta {L}_{\mathrm{w}}^{\ast}\approx 10\ \mathrm{dB} $$ Δ L w ∗ ≈ 10 dB .

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Mohamed, Manal G., Nahla A. Mansour, Ahmed A. Mousa i Azza M. Mazrouaa. "Acoustic Insulation". W ACS Symposium Series, 273–88. Washington, DC: American Chemical Society, 2023. http://dx.doi.org/10.1021/bk-2023-1440.ch013.

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Gösele, K., i E. Schröder. "Sound Insulation in Buildings". W Handbook of Engineering Acoustics, 137–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-69460-1_7.

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Rindel, Jens Holger. "Basic concepts in acoustics". W Sound Insulation in Buildings, 1–18. Boca Raton : CRC Press, [2018]: CRC Press, 2017. http://dx.doi.org/10.1201/9781351228206-2.

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Rindel, Jens Holger. "Introduction to room acoustics". W Sound Insulation in Buildings, 69–100. Boca Raton : CRC Press, [2018]: CRC Press, 2017. http://dx.doi.org/10.1201/9781351228206-5.

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Warnock, A. C. C., i Wolfgang Fasold. "Sound Insulation: Airborne and Impact". W Encyclopedia of Acoustics, 1129–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470172537.ch93.

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Xiang, Ning, i Jens Blauert. "Insulation of Air- and Structure-Borne Sound". W Acoustics for Engineers, 205–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-63342-7_13.

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Muller, G. "Structure-Borne Sound, Insulation and Damping". W Handbook of Engineering Acoustics, 215–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-69460-1_9.

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Wiedemann, Martin. "Lightweight System Design with Integration of Passive Functions". W essentials, 27–33. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-44165-3_3.

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AbstractPassive functions are not used for load transfer alone, as in classic lightweight design, but fulfil other requirements for the overall product, such as minimising aerodynamic drag, providing electrical conductivity and thermal or acoustic insulation.

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Streszczenia konferencji na temat "Acoustical insulation"

Rawlinson, R. D. "Acoustic Design of Lightweight Gas Turbine Enclosures". W ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-054.

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Acoustic enclosures for the gas turbine industry have to comply with a number of stringent safety requirements including structural strength, fire resistance and sound insulation. This has led traditionally to heavy enclosure designs. Corrugated enclosure panels offer significant structural advantages because of their increased bending stiffness. Consequently, a corrugated panel of a given thickness can give the same structural strength as a flat panel of substantially greater weight and thickness. But corrugated panels are intrinsically less effective as a sound insulator than flat panels of the same thickness. This paper examines the implications of corrugated, lightweight panels for acoustic enclosures. It illustrated that, by careful design, the inherent acoustical disadvantages of corrugated panels can be overcome so that thinner, lighter and more cost-effective enclosures can be used without compromising the overall structural and acoustical design requirements.

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Najafi, Seyed Amir Mahmood, Hassan Saadati i Peter Werle. "Comparison of acoustical partial discharge signals under AC and DC stress". W 2016 IEEE Electrical Insulation Conference (EIC). IEEE, 2016. http://dx.doi.org/10.1109/eic.2016.7548652.

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Vergara Balderas, Mario E. "Prospects of the treatment of acoustical insulation in building codes of Mexico". W 160th Meeting Acoustical Society of America. Acoustical Society of America, 2011. http://dx.doi.org/10.1121/1.3651067.

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LoVerde, John, i Wayland Dong. "The low-frequency limit of proposed ratings for quantifying low-frequency impact insulation". W 176th Meeting of Acoustical Society of America 2018 Acoustics Week in Canada. Acoustical Society of America, 2018. http://dx.doi.org/10.1121/2.0000980.

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Di Bella, Antonino, Nicola Granzotto i Luca Barbaresi. "Analysis of acoustic behavior of bare CLT floors for the evaluation of impact sound insulation improvement". W 172nd Meeting of the Acoustical Society of America. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000420.

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Lietzén, Jesse, Ville Kovalainen, Lauri Talus, Mikko Kylliäinen, Aitor Lopetegi i Ander Aldalur. "The effect of suspension systems on the sound insulation of suspended ceilings: a finite element analysis". W 185th Meeting of the Acoustical Society of America. ASA, 2023. http://dx.doi.org/10.1121/2.0001825.

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Gerretsen, Eddy. "The effects of the element damping in sound insulation predictions following EN12354". W 173rd Meeting of Acoustical Society of America and 8th Forum Acusticum. Acoustical Society of America, 2017. http://dx.doi.org/10.1121/2.0000537.

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Tian, Xiujie, Weigao Yu, Richard E. Wentzel, Keda Zhu i Wei Huang. "Calculation of Acoustical Characteristics of the Sound Insulation Pad by Micro Perforated Membrane Theory". W SAE 2013 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2013. http://dx.doi.org/10.4271/2013-01-1940.

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Leite, Pierre, Marc Thomas, Frank Simon i Yves Bréchet. "Optimal Design of an Asymmetrical Sandwich Panel for Acoustical and Mechanical Properties". W ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82504.

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The aim of the present study is to develop specific tools to design optimal panels for multi-objective applications. The objectives considered are stiffness, strength and acoustic insulation at minimum weight. A genetic algorithm is used to design optimal sandwich structures with a good balance of mechanical and acoustical properties. The bending stiffness and mechanical strength of the panel are calculated using beam theory. This analysis is focused on a 3-point bending test, giving the stiffness as the ratio between the concentrated force and the deflection at the center of the sandwich panel. The strength is calculated as the critical force at the onset of plastic deformation. A vibro-acoustical model based on Lagrange’s equations is used to give access to the sound transmission loss of the sandwich panel with anisotropic elastic layers. The main interest is on the mean transmission loss for a diffused incident acoustic field over the frequency range 500–10000Hz. First of all, the optimal design for mechanical properties is assessed at a minimal weight. Quite expectedly, the best solutions are composite-skin with high specific stiffness and soft cores with high shear modulus for a minimum weight. The geometry depends on the required stiffness and strength. The design/properties relationship is discussed by monitoring the evolution of both the material properties and the geometry of the panel. Similarly, a parametric study is performed for acoustical design at minimal weight. In order to maximize the mean transmission loss, it is preferable to lower the critical frequency for which acoustic radiating is maximal. Then, the best solutions for the panel are those who maximize the square root of the density over Young’s modulus. The trade-off between mass and loss transmission is then explored. A comparison between all these solutions provides significant differences in the design with respect to the objectives. In the next step, a multi-objective genetic algorithm is used to find an optimized panel with a good compromise between acoustical and mechanical properties. The optimization is considered with several approaches depending on whether the mass is regarded as the cost function or as a constraint. This study thus provides a preview of the capabilities of multi-objective optimization in design of sandwich panel.

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Price, Stephen, i Donald R. Smith. "High-Frequency Piping Vibration and Noise". W 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27331.

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Many gas transmission facilities utilizing centrifugal compressors and large diameter piping experience high amplitude high-frequency noise and vibration. In addition to being a nuisance noise problem, failures of thermowells, instrumentation, and attached small-bore piping can result. Such problems can also occur in the piping itself when high flow velocities and internal obstructions are present. Many times, high frequency noise problems are treated with acoustical insulation (lagging) on the pipe. However, with an understanding of the underlying physics of two- and three-dimensional acoustics it is often possible to modify the piping design to reduce or eliminate the high frequency energy. Two high-frequency energy generation mechanisms predominate in most industrial processes; flow induced (Vortex shedding) and pulsation at multiples of running speed (blade-pass frequency). Once this energy is generated, amplification may occur from acoustical and/or structural resonances, resulting in high amplitude vibration and noise. Many tools exist for analysis of structural resonances and one-dimensional acoustical resonances. Analysis of high-order acoustics can be accomplished using sophisticated numerical methods (FEA, or BEA); however, a simplificaiton of the three dimensional wave equation which has been reduced to a function of zeroes of the 1st order Bessel function, the speed of sound, and internal pipe dimension can also be used successfully. Several references provide lists of the zeroes of the Bessel function; however, most of these references only provide solutions up to m,n = 6. Field tests have identified cross-wall modes up to m = 30. Therefore, a table is provided for zeros for m = 0–32 and n = 0–8.

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Raporty organizacyjne na temat "Acoustical insulation"

Flynn, Daniel R., David J. Evans i Thomas W. Bartel. An acoustical technique for evaluation of thermal insulation. Gaithersburg, MD: National Institute of Standards and Technology, 1989. http://dx.doi.org/10.6028/nist.ir.88-3882.

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Stevens, R. D., B. V. Chapnik i B. Howe. L51960 Acoustical Pipe Lagging Systems Design and Performance. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), październik 1998. http://dx.doi.org/10.55274/r0010392.

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Noise levels radiated from the exterior of a pipe wall can significantly contribute to the overall noise levels on the site of a gas plant and at neighboring properties. The noise inside the piping is generated both by the gas compressor itself, and by the flow of gas through valves, elbows and fittings. Sound inside the pipe couples to the pipe wall by exciting vibration modes, some of which are radiated from the exterior of the pipe into the air. Piping is geometrically circular, which provides it with considerable increased stiffness versus a flat plate, and thereby assists in its ability to contain low frequency sound inside the pipe. At high frequencies, where the wavelength of sound is short compared to the dimensions of the pipe, the response of the pipe approaches that of a flat plate, and considerably more sound is transmitted. Between the low and high frequency ranges lies the ring frequency, at which the wavelength of sound is equal to the circumference of the pipe; at this resonant frequency, a maximum amount of noise is transmitted out the pipe wall. For smaller pipe sizes, the ring frequency occurs above 5 kHz. For larger pipe sizes on the order of 24 inches to 36 inches, the ring frequency occurs in the range 1 kHz to 3 kHz. These frequencies fall in the most audible range of the sound spectrum. Low frequency sound is not usually of concern for pipe radiated noise, unless the source generates considerably low frequency energy. Acoustical lagging systems typically include one or more layers of porous insulation, to absorb sound and decouple vibration, and one or more layers of an impervious, heavy barrier material to contain the sound. The test configurations for this study were based on systems reported as commonly being used by PRCI member companies. Most of the member companies use fixed-in-place lagging configurations in which the various materials are applied in discrete layers to the pipe during installation. Self-contained, removable blanket systems are also in use by some member companies instead of fixed-in-place configurations, or around equipment such as valves where periodic removal of the lagging is necessary. This study provides a review of acoustic lagging systems for above ground gas piping to minimize noise.

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Novak, Bruce M. Ultra-Low Density Organic-Inorganic Composite Materials Possessing Thermally Insulating and Acoustic Damping Properties. Fort Belvoir, VA: Defense Technical Information Center, maj 1992. http://dx.doi.org/10.21236/ada251182.

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