Academic literature on the topic 'General sound absorption fund of the room'
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Journal articles on the topic "General sound absorption fund of the room"
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Li, Dengke, Daoqing Chang, and Bilong Liu. "Diffuse Sound Absorptive Properties of Parallel-Arranged Perforated Plates with Extended Tubes and Porous Materials." Materials 13, no. 5 (March 1, 2020): 1091. http://dx.doi.org/10.3390/ma13051091.
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The diffuse sound absorption was investigated theoretically and experimentally for a periodically arranged sound absorber composed of perforated plates with extended tubes (PPETs) and porous materials. The calculation formulae related to the boundary condition are derived for the periodic absorbers, and then the equations are solved numerically. The influences of the incidence and azimuthal angle, and the period of absorber arrangement are investigated on the sound absorption. The sound-absorption coefficients are tested in a standard reverberation room for a periodic absorber composed of units of three parallel-arranged PPETs and porous material. The measured 1/3-octave band sound-absorption coefficients agree well with the theoretical prediction. Both theoretical and measured results suggest that the periodic PPET absorbers have good sound-absorption performance in the low- to mid-frequency range in diffuse field.
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Zhou, Bing, Jiangong Zhang, Xin Li, and Bilong Liu. "An Investigation on the Sound Absorption Performance of Granular Molecular Sieves under Room Temperature and Pressure." Materials 13, no. 8 (April 20, 2020): 1936. http://dx.doi.org/10.3390/ma13081936.
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The sound absorption of granular silica-aluminate molecular sieve pellets was investigated in this paper. The absorption coefficients of molecular sieve pellets with different pore sizes, pellet sizes, and layer thicknesses were measured through impedance tubes under room temperature and pressure conditions. The effects of pore size, pellet size, layer thickness were compared and explained. The comparisons show that at room temperature and pressure, the sound absorption of molecular sieve pellets is not a result of the crystalline structure, but rather it mainly changes with the pellet size and layer thickness. In addition, the five non-acoustical parameters of molecular sieve pellets were obtained by an inverse characterization method based on impedance tube measurements. The measurement by impedance tubes is in good agreement with the calculation of Johnson-Champoux-Allard (JCA) model, proving that the JCA model can be effectively used to predict the sound absorption of molecular sieve pellets.
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Arau, Higini. "General Theory of the Energy Relations in Halls with Asymmetrical Absorption." Building Acoustics 5, no. 3 (September 1998): 163–83. http://dx.doi.org/10.1177/1351010x9800500302.
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In this paper we describe a method of calculation of the energy relations in halls where the existence of a non-uniform distribution of absorptive material in the room results in a non-diffuse sound field. The cases of halls used for concerts and speech have both been treated in order to derive new energy relations that yield known expressions when applied to a diffuse sound field. The importance of the initial reverberation time corresponding to the first portion of the decay has been verified showing that the main subjective parameters relating to the sound energy are influenced strongly by this portion, which is called the Early Decay Time if it is measured in the first 10 dB of the decay.
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Gómez Escobar, Valentín, Guillermo Rey Gozalo, and Carlos J. Pérez. "Variability and Performance Study of the Sound Absorption of Used Cigarette Butts." Materials 12, no. 16 (August 14, 2019): 2584. http://dx.doi.org/10.3390/ma12162584.
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There has been increasing interest in new sustainable materials that can be used as construction materials. Among them, sound-absorbing materials have an important role in both acoustical room conditioning and in room insulation. As a proposal for recycling, one of the most common residues in the world, cigarette butts, is studied. Samples were prepared with used cigarette butts as acoustical absorbent materials. Several samples were prepared and grouped by similarity. Variability analyses of the samples prepared in each group were performed. Moreover, the analysis of some possible influences on absorption properties, such as the length of butts, presence of burnt regions, presence of wrapping paper, etc., were analyzed. The results show the potentiality of this residue to be used as an acoustical absorbent since the absorption coefficients found are greater than 0.8 for frequencies over 2000 Hz. The observed variability in the study group and samples can be considered low, as it was below 2% for the major part of frequencies. Influences on the absorption coefficient, for both the length and status of the butts, were statistically confirmed.
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Wu, Xiaowen, Ling Lu, Ziyin Xie, and Hakbong Kim. "A Low-Frequency Sound Absorption Device Fitting for Power Transformation and Distribution Room." Journal of Physics: Conference Series 1739 (January 2021): 012040. http://dx.doi.org/10.1088/1742-6596/1739/1/012040.
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Hoshi, Kazuma, Toshiki Hanyu, Ryoichi Suzuki, and Daisuke Watanabe. "Subjective Effects of Sound Absorption and Investigation of Reverberation Times in Modern Japanese Dwellings." Applied Sciences 11, no. 6 (March 17, 2021): 2709. http://dx.doi.org/10.3390/app11062709.
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This study aimed to reveal the influence of sound absorption in general dwellings on the subjective evaluation of acoustics. First, a subjective experiment was conducted using a full-scale room model. The results indicate that the feelings of silence and serenity can be experienced at absorption coefficients above 0.17, particularly above 0.25. Additionally, we used the recorded binaural sounds for a subjective test instead of using a full-scale room model. This trial showed that the reverberance, feeling of silence, and feeling of serenity can also be evaluated using a headphone listening test. We also measured the reverberation times and recorded the sound environments in three bedrooms, three living and dining (LD) rooms, and three child rooms in modern Japanese dwellings. The average absorption coefficients of the LD and child rooms were lower than 0.17, in the range of 500 Hz to 4 kHz. Therefore, we analyzed the subjective effect of absorption through a psychological test using binaural recorded sounds. The bedrooms with absorption coefficients of 0.18–0.23 were significantly less reverberant, quieter, and more serene than the other rooms.
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Peng, Longgui, Lei Lei, Yongqiang Liu, and Lifei Du. "Improved Mechanical and Sound Absorption Properties of Open Cell Silicone Rubber Foam with NaCl as the Pore-Forming Agent." Materials 14, no. 1 (January 3, 2021): 195. http://dx.doi.org/10.3390/ma14010195.
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Porous materials hold great potential in the field of sound absorption, but the most abundantly used materials, such as Polyurethane (PU) foam and polyvinyl chloride (PVC) foam, would inevitably bring environmental harms during fabrication. In this study, the nontoxic addition-molded room temperature vulcanized silicone rubber is chosen as the matrix, and NaCl particles are chosen as the pore forming agent to prepare open cell foams via the dissolve-separating foaming method. The effect of different amounts of NaCl (0–100 phr) on the cell structure, mechanical and sound absorption properties is investigated and analyzed. The results indicate that the cell structure could be tailored via changing the addition amount of NaCl, and open cell silicon rubber foams could be achieved with more than 20 phr NaCl addition. Open cell silicon foams show the most effective sound absorption for sound waves in middle frequency (1000–2000 Hz), which should be attributed to the improved impedance matching caused by the open cell structures. Additionally, the mechanical properties, including hardness, tensile strength and corresponding elastic properties, gradually decay to a steady value with the increasing addition amount of NaCl. Therefore, open cell silicone rubber foams are capable of sound absorption in middle frequency.
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Labia, Laura, Louena Shtrepi, and Arianna Astolfi. "Improved Room Acoustics Quality in Meeting Rooms: Investigation on the Optimal Configurations of Sound-Absorptive and Sound-Diffusive Panels." Acoustics 2, no. 3 (June 27, 2020): 451–73. http://dx.doi.org/10.3390/acoustics2030025.
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This work deals with the improvement of the room acoustic quality of two medium sized meeting rooms through the investigation of the optimal placement of absorption and diffusive panels on the walls and ceiling. Acoustic measurements have been carried out in the existing untreated rooms with ODEON 13 room acoustics measurement and prediction software, and the Adobe Audition plugins Aurora. Simulations of different combinations of sound absorption and diffusion treatments have been carried out with the updated version of the software, ODEON 15. The panels were positioned in the meeting rooms following the guidelines of the DIN 18041 standard and the scientific literature. The results advise the application of absorptive materials on the ceiling or around the borders, creating a reflective middle area, and on the upper part of one the lateral walls, including the rear wall. Configurations with diffusers do not generally bring significant improvements. The Speech Transmission Index (STI) is a less sensitive parameter for the different acoustic scenarios, compared to Reverberation Time (T) and Clarity (C50). The research also outlined a design workflow, useful to successfully design meeting rooms and rooms for speech in general, which allows to determine the optimal number and location of acoustic panels and to minimize the costs.
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Muhammad, Imran, Anne Heimes, and Michael Vorländer. "Interactive real-time auralization of airborne sound insulation in buildings." Acta Acustica 5 (2021): 19. http://dx.doi.org/10.1051/aacus/2021013.
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Sound insulation auralization can be used as valuable tool to study the perceptual aspects of sound transmission in built environments for assessment of noise effects on people. It may help to further develop guidelines for building constructions. One advanced goal of real-time sound insulation auralization is to appropriately reproduce the condition of noise effects on the human perception and cognitive performance in dynamic and interactive situations. These effects depend on the kind of noise signal (i.e. speech, music, traffic noise, etc.) and on the context. This paper introduces a sound insulation auralization model. The sound insulation filters are constructed for virtual buildings with respect to complex sound propagation effects for indoor and outdoor sound sources. The approach considers the source room sound field with direct and diffuse components along with source directivity and position. The transfer functions are subdivided into patches from the source room to the receiver room, which also covers composite building elements, thus providing more detail to the actual building situations. Furthermore, the receiving room acoustics includes the reverberation of the room based on its mean free path, absorption and binaural transfer functions between its radiating walls elements and the listener. This more exact approach of sound insulation model agrees reasonably well with the ISO standard (i.e. diffuse field theory) under standard settings. It is also shown that the sound field significantly influences the transmitted energies via building elements depending on the directivity and position of the source. The proposed method is validated as a general scheme and includes more details for real-time auralization in specific situations especially in the cases where the simplified diffuse sound field approach fails. It is capable to be used in interactive Virtual Reality (VR) systems, which opens new opportunities for psychoacoustics research in noise effects on human.
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Nilsson, Erling, and Emma Arvidsson. "An Energy Model for the Calculation of Room Acoustic Parameters in Rectangular Rooms with Absorbent Ceilings." Applied Sciences 11, no. 14 (July 18, 2021): 6607. http://dx.doi.org/10.3390/app11146607.
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The most common acoustical treatment of public rooms, such as schools, offices, and healthcare premises, is a suspended absorbent ceiling. The non-uniform distribution of the absorbent material, as well as the influence of sound-scattering objects such as furniture or other interior equipment, has to be taken into account when calculating room acoustic parameters. This requires additional information than what is already inherent in the statistical absorption coefficients and equivalent absorption areas provided by the reverberation chamber method ISO 354. Furthermore, the classical diffuse field assumption cannot be expected to be valid in these types of rooms. The non-isotropic sound field has to be considered. In this paper, a statistical energy analysis (SEA) model is derived. The sound field is subdivided into a grazing and non-grazing part where the grazing part refers to waves propagating almost parallel to the suspended ceiling. For estimation of all the inherent parameters in the model, the surface impedance of the suspended ceiling has to be known. A method for estimating the scattering and absorbing effects of furniture and objects is suggested in this paper. The room acoustical parameters reverberation time T20, speech clarity C50, and sound strength G were calculated with the model and compared with calculations according to the classical diffuse field model. Comparison with measurements were performed for a classroom configuration. With regard to all cases, the new model agrees better with measurements than the classical one.
Dissertations / Theses on the topic "General sound absorption fund of the room"
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Тищенко, Олена Петрівна. "Акустичне облаштування домашнього кінотеатру." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/42428.
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В роботі описується та аналізується інформація що до геометрії на плану приміщення домашнього кінотеатру, умов створення задовільного часу реверберації. Були проаналізовані дві концепції приміщень для домашнього кінотеатру. Заглушене приміщення являє собою приміщення з малим значенням часу реверберації, відповідно, більш детальним підбором звукопоглинаючих матеріалів та високим показником звукоізоляції. Приміщення з акустичним полем залу володіє більшим значенням часу реверберації, задовільним значенням сумарного рівню шуму порівняно з допустим рівнем сумарного шуму у суспільних закладах в нічний час та простим набором звукопоглинальних матеріалів.The work aims to calculate the acoustic design of a damped room and a room with an acoustic field of the hall, which intended for a home theatre. The paper describes and analyses information on the geometry of the layout of the home theatre room, the conditions for creating a satisfactory reverberation time. Two home theatre room concepts were analyzed. A damped room is a room with a short reverberation time, respectively, a more detailed selection of sound-absorbing materials, and a high rate of sound insulation. The room with the acoustic field of the hall has a high value of the reverberation time, a satisfactory value of the total noise level compared to the admissible level of total noise in public institutions at night, and a simple set of sound-absorbing materials.