Journal articles: 'Sound insulation of the room'

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Wei, Shang You, Xian Feng Huang, Zhi Xiang Zhuang, and Jun Xin Lan. "Research on the Prediction of Impact Sound Insulation to a Homogeneous Wall." Applied Mechanics and Materials 744-746 (March 2015): 1593–96. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1593.

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In this paper, a theoretical model to evaluate impact sound transmission through a homogeneous wall is proposed. The model which is based on the Statistical Energy Analysis framework exhibits a system with room-wall-room. For the purpose to explore the mechanism of impact sound transmission through a wall, the impact sound reduction index between two rooms are predicted. Meanwhile, the variation of impact sound reduction index with the walls properties are also taken into account. The results reveal that the density, elastic modulus and thickness of a homogeneous wall have diverse effects on its impact sound insulation and can be chosen adequately to achieve ideal insulation values.It provides an approach to optimize impact sound insulating properties of the walls.

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Obadiah, Jason. "FIELD MEASUREMENT OF AIRBORNE SOUND INSULATION BETWEEN ROOMS." Ultimart: Jurnal Komunikasi Visual 12, no. 1 (January 7, 2020): 24–33. http://dx.doi.org/10.31937/ultimart.v12i1.1397.

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Airborne sound can be a nuisance and a constant expose to the sound can in- troduced health problems to the people in the area especially areas where quiet environ- ment is a necessity. The objective of this measurement is to demonstrate the field mea- surement of the airborne sound insulation properties of interior walls. The measurement was done for determining the sound insulation properties of a partition between two rooms. This measurement will also determine the parameters and source of the prob- lems which are contributing to the airborne sound from the adjacent room. The results are that the volume of the room and the construction of the room (pipe construction and ceiling, etc.) have large effects to the sound transmitted between the rooms.

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Huang, Xian Feng, and Yi Min Lu. "Sound Insulation Inversion to an Attached Room in Buildings." Applied Mechanics and Materials 209-211 (October 2012): 267–71. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.267.

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With respect to the higher sound insulation need of the buildings, the attached room may be considered to adopt. A calculation model is applied to predict the sound insulation of a specified attached room. Realistic sound insulation inversion, furthermore, is consistent with the procedure of engineering practice. By the artificial immune algorithm (AIA), the inverse sound insulation prediction model is developed, which adjust the insulation of each element (wall, door and window etc.) and sound absorption of the attached room. Under agreeing with the reasonable configuration of an attached building and meeting sound insulation requirement simultaneously, it was found that acoustic properties of each member within a whole attached room were obtained. As a consequence, the material and even the configuration of each wall can also be determined. It will be beneficial to building design.

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Rong, Fabing, Zhongjie Cheng, and Peijie Liu. "Study on Sound Insulation Performance of Pressure Relief Wall of Transformer Chamber." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5197–202. http://dx.doi.org/10.3397/in-2021-3004.

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The problem of noise nuisance in indoor substation becomes more and more sensitive. The noise emission index of substation has become an important technical index of substation design. The noise control of indoor substation mainly adopts "auxiliary noise reduction technology" such as sound absorption, sound insulation and vibration isolation. The sound insulation performance of the pressure relief wall in the main transformer room of indoor substation is the key link of noise control. In order to reduce the noise interference, this paper selects the common sound insulation structure of the pressure relief wall, analyzes the main influencing factors of noise reduction, selects the sound insulation structure suitable for the pressure relief wall in the main transformer room of indoor substation, and tests the effectiveness of noise reduction of the sound insulation structure in the actual case. Based on the research results, the sound absorption structure in the main transformer room is arranged on the other indoor wall outside the pressure relief wall, and the pressure relief wall mainly considers the structure of sound insulation, which can effectively reduce the noise impact of the main transformer room.

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Ivanova, Yonka, Todor Partalin, Luben Lakov, and Bojidar Jivov. "Airborne sound insulation of new composite wall structures." MATEC Web of Conferences 145 (2018): 05013. http://dx.doi.org/10.1051/matecconf/201814505013.

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Protection against noise is one of the essential requirements of the European Construction Product directive. In buildings, airborne sound insulation is used to define the acoustical quality between rooms. In order to develop wall structures with optimal sound insulation, an understanding of the physical origins of sound transmission is necessary. To develop a kind of knowledge that is applicable to the improvement of real walls and room barriers is the motive behind this study. The purpose of the work is to study the sound insulation of new composite wall structure.

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Granzotto, Nicola, and Edoardo Alessio Piana. "Evaluation Method for Façade Acoustic Insulation for a Corner Room: Discussion on the Results Obtained as a Function of the Source Position." Applied Sciences 10, no. 21 (October 22, 2020): 7434. http://dx.doi.org/10.3390/app10217434.

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The appropriate acoustic insulation project of building façades is of importance for the design of highly comfortable living environments. In some countries, national regulations require maximum noise levels inside rooms, or minimum sound insulation limits, to be respected. The acoustic insulation design of a façade is usually performed according to the ISO 12354-3 standard, which presents a calculation method based on the geometry of the room, the shape of the façade, the areas and the acoustic performances of the individual elements. The prescribed limits must be experimentally verified according to methods derived from international standards. However, the current versions of such standards do not provide details on how to perform the measurements and the calculation of the sound insulation for corner rooms. An important remark is that, depending on the position of the sound source used for the measurements, different results of the standardized sound insulation are obtained. This article proposes a new method for calculating the façade insulation of corner rooms by introducing the acoustic attenuation due to the diffraction of the corner and the distance of the sound source from the façades, estimated through simulations and experimentally validated.

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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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Mao, Jian Xi. "Research of Optimization Design on Floating Floor Insulation." Advanced Materials Research 163-167 (December 2010): 2410–14. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.2410.

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In order to acquire a high quality of living environment, it is necessary to investigate the subjects of floor impact sound insulation. According to the characteristics of optimization design method and restricted optimization math model, the sound transmission between floor and adjacent room down through floating floor has been modeled in a finite-element method. Floating floor structure are studied to realize the design optimization when the room average sound pressures are selected as objective function. Predicted results show that when keep the whole thickness of floating floor fixed, result of dynamics optimization design can reduce room average sound pressure effectively. And when keep the whole thickness of floating floor unfixed, optimization results have been gotten on the total thickness of floor layer and resilient interlayer of the floating floor, and the average sound-pressure in room is lower than original one availably.

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Berardi, Umberto. "A Comparison of Measurement Standard Methods for the Sound Insulation of Building Façades." Building Acoustics 19, no. 4 (December 2012): 267–82. http://dx.doi.org/10.1260/1351-010x.19.4.267.

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This paper focuses on the limits of measurement of the sound insulation of building façades at low frequencies. Three standard methods are compared mainly for the position of the equipment. In particular, the positions proposed by the international standard ISO 140-5 and the national standards ASTM E 966 (USA) and JIS A 1430 (Japan) are considered. The limits of measurement of the sound pressure level in front of the façade are investigated. Different placements of the external source and receiver are considered. Moreover, different placements of the receiver inside small rooms are compared by focusing on corner vs. center room positions. The uncertainties of room averaged sound pressure levels measured according to different standards are discussed. The problems of measurement of the reverberation time in small rooms and of sound insulation in irregular shaped rooms are introduced because these measurements present several critical challenges. Finally, suggestions to improve the future version of the ISO 140-5 are reported.

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Jung, Jae-Deok, Suk-Yoon Hong, Jee-Hun Song, and Hyun-Wung Kwon. "Predictions of airborne noise between unit cabins by developing a cavity transfer matrix." Noise Control Engineering Journal 69, no. 3 (May 1, 2021): 229–42. http://dx.doi.org/10.3397/1/376923.

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The unit cabin has been used to construct internal ship space for improved efficiency and to reduce budgetary costs in shipbuilding. Because the cavity is placed between unit cabins, the noise of one room is transmitted through the sound insulating panel, the cavity, and the opposite sound-insulating panel. In this study, by developing a transfer matrix of the cavity between structures, airborne noise between unit cabins was predicted. A sandwich panel, which is usually used in ships, was employed to construct a double panel, and the sound insulation performance was confirmed by changing the thickness of the cavity. To improve the reliability of numerical results, they were compared with those from experiments conducted. The results showed that as the cavity size increases, the overall sound insulation performance improves. A parameter study was also conducted on the density, Young's modulus, thickness, and thickness ratio of the core of the sandwich panel. To improve the sound insulation performance, increasing the density of the core is preferable to increasing the core thickness. The panel thickness ratio should be increased to avoid performance degradation as a result of the resonance frequency.

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Elsasser, Manfred. "Composite sound insulation system for room boundary surfaces." Journal of the Acoustical Society of America 115, no. 4 (2004): 1397. http://dx.doi.org/10.1121/1.1738248.

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Lu, Xiao Dong, Jin Hong Wang, and Wei Ling Wang. "Windows Sound Insulation Research with Different Glass." Applied Mechanics and Materials 584-586 (July 2014): 1868–71. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1868.

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As the weak area of the residence envelope’s, window’s sound insulation is very important in the way of indoor quiet assurance. Base on the road traffic noise as sound sources, the sound insulation comparative studies is made between the insulating laminated glass and double insulated glass. The article choose two similar rooms near the Gaoerji road in Dalian assembled with the different windows, one room’s window was assembled with the insulating laminated glasses, and the other was assembled with double insulated glasses. Research shows that sound insulation effect of the wall with insulating laminated glass is better than the wall with double insulated glass 4dB.

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Yeon, Jun Oh, Kyoung Woo Kim, Kwan Seop Yang, and Myung Jun Kim. "Analysis of the Airborne Sound Insulation Performance of Floor Structures Based on the Intensity Method." Applied Mechanics and Materials 752-753 (April 2015): 796–99. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.796.

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Apartment buildings are constructed using box frame structures that integrate slabs and wall frames, and vibrations can easily travel through these integrated box frame structures. On the other hand, such a framed structure generates fewer gaps between structural elements, assuring a superior insulation performance of airborne sound compared to wooden houses. Vertically installed equipment running through different floor levels can serve as a transmission route for airborne sound of specific frequency bands. In this study, we sought to develop technical methods to improve the inter-floor airborne sound insulation performance. To this end, we measured the sound insulation performance of floor structures and intensity levels in noise penetration areas. The sound insulation performance of the living room floor structure was measured to exceed 51 dB, which was superior to that of the restroom floor by 2–7 dB. Intensity measurements identified the central and corner areas of the living room as high-level noise areas.

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Монич, Д. В., И. В. Матвеева, П. А. Гребнев, and Д. С. Кузьмин. "Research of the Influence of Geometric Parameters of Rooms for Sound Insulation of Lightweight Partitions." НАУЧНЫЙ ЖУРНАЛ СТРОИТЕЛЬСТВА И АРХИТЕКТУРЫ, no. 4(64) (December 22, 2021): 37–47. http://dx.doi.org/10.36622/vstu.2021.64.4.003.

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Состояние проблемы. Звукоизоляция легких перегородок значительно зависит от места их установки в здании. Необходимы исследования структуры звукового поля в несоразмерных помещениях и анализ его влияния на звукоизоляцию легких ограждений. Результаты. Проведены натурные и лабораторные экспериментальные исследования звукоизоляции каркасно-обшивной перегородки, установленной в коридоре. Для случая соразмерного помещения получена хорошая сходимость результатов. Теоретически исследована структура звукового поля при зеркальном отражении звука (с использованием метода прослеживания лучей). Выполнены расчеты с получением распределений долей осевых, касательных и косых лучей в помещениях, расчеты уровней интенсивности звуковых волн, падающих на боковые стены и потолок коридора. Учитывалось положение источника шума относительно перегородки и других ограждений. Выводы. Пропорции помещений влияют на звукоизоляцию легких ограждений. В диапазоне ниже граничной частоты диффузности несоразмерного помещения с источником шума структура звукового поля неоднородная, звуковые лучи падают на ограждение неравномерно с различных направлений. Это приводит к уменьшению совпадений мод колебаний в воздухе и в ограждающей конструкции, частотная характеристика звукоизоляции ограждения имеет пикообразный вид. Statement of the problem. Sound insulation of lightweight partitions depends significantly on the place of installation in the building. It is necessary to study the structure of the sound field in disproportionate rooms and analyze its effect on the sound insulation of light enclosures. Results. Natural and laboratory experimental studies of the sound insulation of the frame partitions installed in the corridor were carried out. For the case of a commensurate room, good convergence of the results was obtained. The structure of the sound field with mirror reflection of sound has been theoretically investigated using the method of tracing of sound rays. Calculations were performed to obtain the distributions of the proportions of axial sound rays, tangential sound rays, oblique sound rays in the premises, and the calculations of the intensity levels of sound waves incident on the lightweight partition and other enclosures of the corridor. The position of the noise source relative to the lightweight partition and other enclosures of the corridor was taken into account. Conclusions. The proportions of the rooms affect the sound insulation of lightweight enclosures. The structure of the sound field of a disproportionate room with a noise source is non-uniform in the range below the boundary frequency of diffuse sound field. Sound rays fall on the lightweight partition unevenly from different directions. This leads to a decrease in the coincidence of wave modes in the air and wave modes in the lightweight partition. The frequency characteristic of the sound insulation of the lightweight partition has a peak-like appearance.

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Zakharov, Arkadiy, and Ivan Saltikov. "SETTING UP A PROBLEM OF AIR-BORNE SOUND IN-SULATION CALCULATION FOR DOUBLE LAYER MASSIVE ENCLOSURES ON THE BASE OF THE MODELS WITH THE CONCENTRATED PARAMETERS." International Journal for Computational Civil and Structural Engineering 16, no. 4 (December 28, 2020): 111–20. http://dx.doi.org/10.22337/2587-9618-2020-16-4-111-120.

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The calculation methods on the base of the concentrated parameters models, which were formed in the XX century, allowed to get simple and theoretically consistent solutions for the problems of one-layered building partitions sound insulation finding. The sound insulation estimation for the double-layered massive building partitions also is of scientific and practical interest, as double layer partitions are the particular case of the single layer enclosure's application. The concept of concentrated parameters includes the concentrated and the reduced masses, as well as the concentrated elasticity. The criteria for the object application as a specified kind of the concentrated parameters in the acoustical problems is the presence or the absence of the oscillation movement in it. The three calculation models with the application of the concentrated (discreet) parameters that to define the sound insulation of the massive double layer enclosures are given. The equations for sound insulation computation for one layer partition are represented. They were derived on the base of momentum law and energy conservation formulas under the continuity of energy flow conditions at the interface of different media. The three main paths of sound propagation from the room with the air-borne noise to the isolated room are shown. The two frequency range are separated on the way of the direct sound propagation: at the first, the surface density of the one of two layers and the air elasticity in the inter-layer gap influence on isolation; at the second one, the predominant role belongs to the summarized insulation by the "Mass Action Law" of the two layers. The indirect way's insulation is taken in account through the additional sound insulation graph drawing. The compound insulation curve is defined by the ways, where the sound energy transmittance is maximal at the standard frequency spectrum. The method of sound insulation calculation for the double layer partitions on the base of the concentrated parameters model application is revealed. As an example, the calculation of a prefabricated double layer inter-flat wall in the panel building was performed.

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Zhou, Ji Hong, Jian Guo Tan, Hong Xia Wang, and Hai Zhen Ma. "Research on Noise Reduction in Boiler Room - An Actual Case on North Boiler Room." Key Engineering Materials 467-469 (February 2011): 2159–62. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.2159.

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As to the noise pollution of the Hebei University of Engineering north boiler room, we have conducted a series of actual research, monitoring, and analysis of the spectrum of various monitoring sites. According to the results of the spectrum analysis, we found the noise source and proposed noise reduction measures, namely the establishment of sound insulation room in which the drums and induced draft fan installed, and the wall of the room are appended acoustic sound--absorbing material. The results show that this noise reduction method is feasible.

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Lundberg, Karl-Ola. "An Alternative Method for Measurement of Airborne Sound Insulation." Building Acoustics 8, no. 1 (March 2001): 57–74. http://dx.doi.org/10.1260/1351010011501731.

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A method for determination of the transmission coefficient from Complex Modulation Transfer Functions CMTF:s based on measured impulse-responses is shown. In the method a separate measurement of the equivalent sound absorption area is not needed in contrast to in the standardised measurement. By averaging over a number of estimates of the impulse-response the influence of background noise can be reduced substantially, implying that low-power sources can be used. A model for the power balance in the receiving room with time-varying power is considered. In the model the quotient of the receiving room intensity and the source room intensity has one pole, which is proportional to the equivalent sound absorption area in the receiving room, and a gain, proportional to the transmission coefficient. In the physical system the power can be time-varied by letting the system excitation signal consist of random noise modulated with a deterministic time-varying function. However, since the ensemble average of the squared response is proportional to the squared impulse-response convolved with the squared modulating function, random excitation is avoided and replaced by impulse-response measurements. The quotient of intensities in the model is in the physical system a quotient of CMTF:s. Experiments are carried out in an airborne sound insulation laboratory. For comparison, standardised measurements are also carried out. It is found that the presented method gives as result comparatively small transmission coefficients, though the relative differences are small. By refining the power balance model by introducing an energy propagation time delay, and selecting an appropriate delay, the differences were diminished.

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Daud, M. A. M., M. Z. Selamat, and A. Rivai. "Effect pf Thermoplastic Polymer Waste (PET) in Lightweight Concrete." Advanced Materials Research 795 (September 2013): 324–28. http://dx.doi.org/10.4028/www.scientific.net/amr.795.324.

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Contruction concrete that use of insulation wall in building construction faces some problems such as having high weight, very reflective sound, heat transfer (the effectiveness of heat conductivity) incompetence and mechanical properties (strength) constraints. The sounds which impinge the wall cannot be absorbed efficiently but instead gives high reflection. This causes some noise of high echo in a room. So a good acoustic insulation must be efficient in absorbing the sound. This project proposes lightweight concrete as a replacement for insulation wall. This lightweight concrete will be developed using thermoplastic polymer waste which is recycled plastic bottles, sand, water, and cement. This research used thermoplastic polymer waste which is PET (Polyethylene Terephthalate) material as the reinforcement material to replace small gravel in lightweight concrete. All its composition percentage of raw materials was divided into different samples composition. Its composition determines the performances of the samples in density, porosity and mechanical properties.

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Guan, Yi-Jun, Yong Ge, Hong-Xiang Sun, Shou-Qi Yuan, and Xiao-Jun Liu. "Low-Frequency, Open, Sound-Insulation Barrier by Two Oppositely Oriented Helmholtz Resonators." Micromachines 12, no. 12 (December 11, 2021): 1544. http://dx.doi.org/10.3390/mi12121544.

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In this work, a low-frequency, open, sound-insulation barrier, composed of a single layer of periodic subwavelength units (with a thickness of λ/28), is demonstrated both numerically and experimentally. Each unit was constructed using two identical, oppositely oriented Helmholtz resonators, which were composed of a central square cavity surrounded by a coiled channel. In the design of the open barrier, the distance between two adjacent units was twice the width of the unit, showing high-performance ventilation, and low-frequency sound insulation. A minimum transmittance of 0.06 could be observed around 121.5 Hz, which arose from both sound reflections and absorptions, created by the coupling of symmetric and asymmetric eigenmodes of the unit, and the absorbed sound energy propagating into the central cavity was greatly reduced by the viscous loss in the channel. Additionally, by introducing a multilayer open barrier, a broadband sound insulation was obtained, and the fractional bandwidth could reach approximately 0.19 with four layers. Finally, the application of the multilayer open barrier in designing a ventilated room was further discussed, and the results presented an omnidirectional, broadband, sound-insulation effect. The proposed open, sound-insulation barrier with the advantages of ultrathin thickness; omnidirectional, low-frequency sound insulation; broad bandwidth; and high-performance ventilation has great potential in architectural acoustics and noise control.

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Girdhar, Sunit, and Andrew Barnard. "Improved low-frequency sound measurements for impact insulation class (IIC) rating using a comparison technique." Noise Control Engineering Journal 68, no. 1 (January 20, 2020): 72–86. http://dx.doi.org/10.3397/1/37686.

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In multistory buildings, the isolation of sound from floor to ceiling is a major concern. The building codes use an impact insulation class (IIC) rating defined by ASTM to characterize the acoustical performance of floorâ–“ceiling assemblies due to impacts. The measurement process defined in this standard has repeatability and reproducibility limitations due to low-frequency, non-diffuse sound fields in receiving rooms. A comparison method is proposed in this article that uses a reference sample with known sound power to calculate the room or path contribution to the measured sound pressure level, which is then used to calculate the sound power of the floorâ–“ceiling assembly. The proposed method is tested for a small-scale hardboard plate, and the test results are within 1 to 2 dB of baseline sound power values. A simply supported plate used as the reference plate showed MAC values higher than 0.9 for analytical and experimental mode shapes. The analytical natural frequencies are within 1% to 2% of experimental frequencies and analytical sound power values are within 1-2 dB of experimental data. This study showed that for a small-scale assembly, the new methodwas able to characterize the room contribution within 1 to 2 dB.

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Bondan Dwisetyo, Maharani Ratna Palupi, and Fajar Budi Utomo. "UNCERTAINTY ANALYSIS OF LABORATORY MEASUREMENT OF AIRBORNE SOUND INSULATION." Spektra: Jurnal Fisika dan Aplikasinya 5, no. 2 (August 31, 2020): 97–108. http://dx.doi.org/10.21009/spektra.052.02.

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The evaluation and analysis of the uncertainty of laboratory measurement of airborne sound insulation have been carried out by Research Group for Acoustics and Vibration – National Standardization Agency of Indonesia (BSN). The aims of this work are to evaluate and analyze the uncertainty measurement of airborne sound insulation by pressure method, where it is focused only for the determination of sound transmission loss (STL) as a major product of this measurement according to ASTM, and guide to the expressions of Uncertainty in Measurement (GUM) provided by JCGM. The supplied parameter of uncertainty budgets includes measurement of sound pressure level (SPL) in a source room (L1), and measurement of some parameters in a receiver room such as SPL (L2), reverberation time (RT60), background noise (B), test opening area (S), and volume of receiver room (V). From the result of the case study, the source of uncertainty that has a top contribution for obtaining expanded uncertainty is considered as the repeated measurement of the measured parameter such as L1, L2, and RT60 at the frequency range 250 Hz – 315 Hz. Meanwhile, the standard uncertainty that provided by the calibration certificate also contributes to the final result, where it is supplied by an acoustic calibrator and sound analyzer, respectively. Furthermore, the sources obtained from the readability parameter has a slight effect on this whole result. Therefore, the maximum and minimum value of expanded uncertainty is determined that their values are 0.70 dB and 0.43 dB for the frequency of 315 Hz and 1600 Hz, respectively.

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Amiryarahmadi, Nata, and Wolfgang Kropp. "A virtual design studio for low frequency impact sound from walking." Acta Acustica 5 (2021): 40. http://dx.doi.org/10.1051/aacus/2021033.

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Experience with wooden multi-storey houses have shown that impact sound insulation is one of most critical issues to ensure a good indoor environment. Even in cases where the impact sound insulation is fulfilled, people perceive the sound from e.g. walking neighbours as very disturbing. To investigate the subjective perception, a test facility is needed which allows for a coherent evaluation of different floor designs by listening test. The facility should ensure, that when comparing different floors, the same excitation by a walker and the same receiving room are involved. Only the floor design should be changed. As a consequence the spread in the data will only be due to the spread in the perception by subjects. In this paper a virtual design tool for low frequency impact sound insulation is presented, which consists of four parts; measured walking forces, floor models, an auralisation system which consists of a grid of loudspeakers simulating the vibration of the floor and a receiving room furnished as a common living room. In a pilot study a listening test is carried out for 13 different floors with different impact sound spectra at frequencies below 100 Hz. The results indicate that the judged annoyance strongly correlates with the judged loudness. However, there is a substantial spread observed in between the subjects participating in the listening tests. To understand this spread, a more extended study is needed with more participants and a classification of the subjects with respect to criteria such as noise sensitivity or age.

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Lu, Feng Hua, Xin Xing Wang, and Miao Bo Li. "Acoustical Design and Measurement of 316 Classroom in TYUT." Applied Mechanics and Materials 105-107 (September 2011): 800–803. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.800.

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This paper involves the acoustical design and measurement of sound quality in the new 316 classroom in TYUT. Based on the “Code for design of sound insulation of civil buildings” GBJ118-2010， this paper deals with the acoustical design of the frequency characteristics of reverberation time in the new 316 classroom in TYUT. Before the acoustical design in new 316 Classroom, the measurement of reverberation time (T20, T30, EDT) with frequency 500-1000Hz in empty room are 3.86-4.72s; After the acoustical design that the perforated wooden sound absorption tablet wall within glass wool sound absorption and the gypsum -slab mineral wool board ceiling are mounted in new 316 Classroom in TYUT, the measurement of reverberation time (T20, T30, EDT) with frequency 500-1000Hz in empty room are 0.72-0.82s.Through the checking of the testing data and the evaluation of the users, the acoustical design of the new 316 classroom in TYUT is in accordance with the requirements of Code for design of sound insulation of civil buildings GBJ118-2010.

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Zambon, Giovanni, Roberto Benocci, Fabio Angelini, and Chiara Scrosati. "Effect of room partitions on airborne and impact sound insulation in large, open rooms." Building Acoustics 23, no. 1 (March 2016): 17–35. http://dx.doi.org/10.1177/1351010x16629005.

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Lyons, Richard. "Sound Insulation of Acoustic Louvres and Open Screens." Building Acoustics 1, no. 2 (June 1994): 105–24. http://dx.doi.org/10.1177/1351010x9400100202.

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This paper reviews the problem of measuring sound insulation of acoustic louvres and other open screens. A survey of manufacturers in the UK shows that there is little agreement on a test method and performance data is often provided using several indices. The most commonly used method, ISO 140, is inappropriate for acoustic devices with transmission losses of 15dB or less. A review is given of the terminology and methods of measurement used, other non-standard methods are considered and a more suitable method, using impulse response techniques, is proposed. This method does not require special acoustic facilities. Results obtained by impulse methods are compared with standard reverberant room measurements and for screens offering more than 15dB insulation the agreement is promising.

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Fanina, E. "EFFICIENT ACOUSTIC COMPOSITE PANELS BASED ON GRAPHITE." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 6, no. 4 (May 7, 2021): 82–90. http://dx.doi.org/10.34031/2071-7318-2021-6-4-82-90.

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A set of experimental studies is carried out to determine the acoustic characteristics of three-dimensional panels of fixed thickness made of carbon-based composite material installed in the opening between the reverberation chambers. Sound insulation indices are determined when they are excited by a diffuse sound field in wide frequency ranges. The reverberation time in model chambers with different partition configurations is calculated. The optimal configuration of the partition with pyramidal cells to reduce the reverberation time in the rooms is determined. The use of graphite in the form of thin membrane applied to various surfaces can significantly reduce the sound pressure levels in the room and increase the sound insulation indices of air noise. In addition to thin membrane, graphite can be used as an additive in composite materials for sound insulation purposes. It is shown that the characteristics of such panels are quite universal. The measured acoustic characteristics of composite panels are compared with similar characteristics of traditional materials. It is determined that the composition belongs to the I group of fire-retardant efficiency and can be recommended for use as a fire-retardant material. The developed acoustic material is an effective absorbing agent that solves problems in architectural acoustics, echo cancellation in construction and architecture. Similar to metamaterials, natural and artificial graphites allow to solve these problems with small volumes and masses using simple and inexpensive technologies.

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Tassia, R. D., W. A. Asmoro, and D. Arifianto. "Airborne sound insulation evaluation and flanking path prediction of coupled room." Journal of Physics: Conference Series 776 (November 2016): 012076. http://dx.doi.org/10.1088/1742-6596/776/1/012076.

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AIDA, Yu, Naohisa INOUE, and Tetsuya SAKUMA. "NUMERICAL SIMULATION ON SOUND INSULATION MEASUREMENT OF WALLS IN REVERBERATION ROOM." Journal of Environmental Engineering (Transactions of AIJ) 85, no. 768 (2020): 115–24. http://dx.doi.org/10.3130/aije.85.115.

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Seo, Hyuk-Shin. "A Study on the Sound Insulation Performance in the Home Studio." Journal of the Korea Entertainment Industry Association 12, no. 1 (January 31, 2018): 309–15. http://dx.doi.org/10.21184/jkeia.2018.1.12.1.309.

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Dariusz, Pleban, and Mikulski Witold. "Methods of Testing of Sound Insulation Properties of Barriers Intended for High Frequency Noise and Ultrasonic Noise Protection." Strojnícky casopis – Journal of Mechanical Engineering 68, no. 4 (December 1, 2018): 55–64. http://dx.doi.org/10.2478/scjme-2018-0047.

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AbstractTwo test stands for determining sound insulation in the frequency range above 5 kHz were made. One consisted of two horizontally adjacent reverberation rooms and a special source of high frequency sounds and ultrasounds. The other test stand consisted of a miniaturized test chamber and a special source of ultrasounds. The paper presents results of the preliminary measurements of sound insulation properties of different barriers in the frequency range above 5 kHz.

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Szudrowicz, Barbara, and Elżbieta Nowicka. "Factors affecting the sound insulation in the prefabricated buildings." Budownictwo i Architektura 13, no. 4 (December 9, 2014): 049–56. http://dx.doi.org/10.35784/bud-arch.1692.

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The sound insulation in buildings is affected by many factors related to various sound transmission paths between rooms. Among them the following paths can be distinguished: the so called direct path dependent on the sound insulation of the partition between rooms, the structural flanking transmission paths and additional airborne paths due to sound transmission though leaks and ducts linking the rooms (e.g. ventilation ducts). The paper analyzes the influence of these factors on sound insulation in multifamily, prefabricates buildings. Laboratory and field measurement results made by ITB’s Acoustic Department in the period of 1975-85 are presented.

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Akkerman, Davi, Paola Weitbrecht, Mariana Shieko, Marcel Borin, and Leonardo Jacomussi. "Impact sound transmission: experiments of control at the receiver room." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5595–99. http://dx.doi.org/10.3397/in-2021-3169.

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Considering Impact sound level requirements accomplishment in Brazil, floating floors are still considered as an inviable solution for building companies due to the implications in the total cost of building, mainly for social housing. Alternative and sometimes cheaper solutions are those undertaken in the receiver room. However, the lack of laboratory and field tests on the acoustic performance of this type of system is still a barrier for acoustic designing in Brazil. The aim of this paper is to study and validate different constructive solutions developed jointly with building companies for improving the impact sound insulation performance on the receiving room of new Brazilian housing constructions.

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Zhang, Jiping, Zheming Wang, Heng Ma, and Weike Wang. "Field measurement of reverberation time and average absorption of one high-rise building room by road traffic noise penetrating facade." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (August 1, 2021): 2875–86. http://dx.doi.org/10.3397/in-2021-2248.

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The facade insulation (FI) is one choice for Road traffic noise (RTN) at a high-rise accommodation building nearby a motor road. The weakness of FI is from window, so the window insulation (WI) is also a prioritized descriptor. ISO16283-3 states a field method to measure FI using RTN. However, in room acoustics, besides FI, reverberation time (RBT) or indoor average sound absorption (IASB) are another two un-ignorable descriptors. When the value of IASB is small, the indoor noise is not only contributed from penetrating façade RTN, but also supplemented by the residual sound from high reverberation field, weakening FI. As a parallel to ISO16283-3, this paper suggests an engineering method to measure RBT and IASB of one high-rise building room close to a motor road by penetrating façade RTN. It can supply a convenient tool for the field measurement of RBT and IASB with RTN. At the end, we made a field measurement of RBT, IASB, and WI at a hotel room nearby a viaduct in Hangzhou of China, assistant to adjust RBT or IASB and WI so as to improve the sound quality of the hotel. Further, the method can extend to the lines of rail, aviation, and shipping.

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Turkdogru Gurun, Nurkan, Jonathan Chen, Frederick Ward, Matthew Wilcox, and Zhiming Luo. "Prediction and Improvement of Aircraft Cabin Acoustics using Statistical Energy Analysis and Sound Quality Evaluation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 257–66. http://dx.doi.org/10.3397/in-2021-1382.

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Aircraft interior acoustic design is a key influencer for cabin comfort. An essential part of the design is optimization of acoustic insulation systems under weight restrictions to create a pleasant environment for human ear. Considering the complexity of aircraft geometry, noise sources, and transfer paths, computational prediction techniques become invaluable tools for increasing the accuracy in material selection while reducing design time and costs. In this study, a procedure that integrates sound quality evaluation with Statistical Energy Analysis (SEA) to design aircraft acoustic insulation systems is described. SEA is employed to predict the cabin sound pressure levels of a narrow body aircraft insulated with sound absorption and vibration damping materials. Aircraft cabin including under-floor sections is modelled based on 3D airframe and VIP style interior design and the model is validated with flight test data. Transfer functions obtained from SEA model for selected transfer paths are utilized to filter the noise signal recorded with a binaural recording system during flight. Sound quality metrics are computed in order to map perceptive response. An iterative process is introduced to improve acoustic design by investigating the effects of different sound insulation systems and room absorption values on noise levels and sound quality metrics.

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Tascan, Mevlut, and Edward A. Vaughn. "Effects of Fiber Denier, Fiber Cross-Sectional Shape and Fabric Density on Acoustical Behavior of Vertically Lapped Nonwoven Fabrics." Journal of Engineered Fibers and Fabrics 3, no. 2 (June 2008): 155892500800300. http://dx.doi.org/10.1177/155892500800300206.

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Acoustical insulation and absorption properties of nonwoven fabrics depend on fiber geometry and fiber arrangement within the fabric structure. The different structures of the fibers result in different total surface areas of nonwoven fabrics. Nonwoven fabrics such as vertically lapped fabrics are ideal materials for use as acoustical insulation products, because they have high total surface. Vertically lapped nonwoven technology consists of carding, perpendicular layering of the carded webs, and through-air bonding using synthetic binder fibers. The surface area of the fabric is directly related to the denier and cross-sectional shape of the fibers in the fabric. Smaller deniers yield more fibers per unit weight of the material, higher total fiber surface area, and greater possibilities for a sound wave to interact with the fibers in the fabric structure. The research in the literature uses two methods for measuring acoustical properties of fabric materials: the impedance tube and reverberation room method. Small test samples are in the impedance tube method and sound absorption coefficient is determined at each frequency. Large reverberation rooms and large test samples are used for the reverberation room method. A direct comparative acoustical properties measurement device that was designed and fabricated at Clemson University School of Materials Science & Engineering was used to measure acoustical insulation in this research. This paper provides a description of the measurement devices and acoustical measurement data for vertically lapped nonwoven fabrics made from three different polyester fiber shape and two denier levels.

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Xiang, Ning. "Correlation methods of room impulse responses for chamber-based sound insulation measurements." Journal of the Acoustical Society of America 148, no. 4 (October 2020): 2514. http://dx.doi.org/10.1121/1.5146986.

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Gover, Bradford N., and Trevor R. T. Nightingale. "Room requirements for laboratory measurement of transmission loss and impact sound insulation." Journal of the Acoustical Society of America 126, no. 4 (2009): 2170. http://dx.doi.org/10.1121/1.3248444.

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Navacerrada, María A., Cesar Díaz, and Antonio Pedrero. "Pressure Level Standard Deviation at Low Frecuencies: Effect of the Wall Vibrational Field." Archives of Acoustics 37, no. 4 (December 1, 2012): 561–69. http://dx.doi.org/10.2478/v10168-012-0066-8.

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Abstract Knowledge of the uncertainty of measurement of testing results is important when results have to be compared with limits and specifications. In the measurement of sound insulation following standards ISO 140-4 and 140-5 the uncertainty of the final magnitude is mainly associated to the average sound pressure levels L1 and L2 measured. However, the study of sound fields in enclosed spaces is very difficult: there are a wide variety of rooms with different sound fields depending on factors as volume, geometry and materials. A parameter what allows us to quantify the spatial variation of the sound pressure level is the standard deviation of the pressure levels measured at the different positions of the room. Based on the analysis of this parameter some results have been pointed out: we show examples on the influence of the microphone positions and the wall characteristics on the uncertainty of the final magnitudes mainly at the low frequencies regime. In this line, we propose a theoretical calculus of the standard deviation as a combined uncertainty of the standard deviation already proposed in the literature focused in the room geometry and the standard deviation associated to the wall vibrational field.

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Tomita, Ryuta. "Research work of Prof. Tomita, including: 1. Examination of environmental vibration measurement using vibration control rubber on carpet. 2. Measures against floor impact sound by heavy-impact source using storage furniture with tatami. 3. Study on tatami mat considering safety when falling in case of falling collision and sound insulation performance. 4. Research on evaluation method and evaluation rank for vertical vibration." Impact 2020, no. 4 (October 13, 2020): 15–17. http://dx.doi.org/10.21820/23987073.2020.4.15.

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A tatami is a type of mat used as a floor material in many rooms in Japan. They are also used in training rooms, such as in a dojo or martial arts, and are often covered with woven straw. Tatami mats were used as flooring materials for buildings in the Kamakura period (c. 1185) and have a long history. Tatami is often used in the Japanese-style room of today's homes. Generally, tatami mats are 55 mm thick; some mats are made of mostly straw and some made of insulation board and extruded polystyrene foam. The surface of both types of mats is covered with tatami facing. More recently, tatami mats made of insulation board and extruded polystyrene foam are used in homes. Despite their presence in Japanese buildings, there are several problems associated with tatami mats and other floor materials. One of the potential problems concerns the safety of individuals who fall on the mats, while another is the sound created by impact on the mats, such as when people walk or run across them. Research is underway to find effective ways of improving the sound insulation performance of floor materials at the same time as considering the safety of the inhabitants of the buildings with the mats in them. One team, which is investigating means of improving tatami mats and the materials used to build them, is based at the College of Science and Technology in Nihon University, Japan. Led by Professor Ryuta Tomita, the team is engaged with several projects revolving around overcoming heavy-weight floor impact sound insulation performance and safety of individuals who fall on tatami mats.

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Demirkale, Sevtap Yilmaz, and Mine Ascigil-Dincer. "Retrofitting masonry and cavity brick façades for different noise zones using laboratory measurements." Building Acoustics 24, no. 2 (March 1, 2017): 77–100. http://dx.doi.org/10.1177/1351010x17693399.

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Façade airborne sound insulation is crucial for protection of indoor environment from environmental noise. In Turkey, sound insulation in new buildings is bound by law, but 6 million pre-1980 dwellings with thin brick walls and single-glazed windows used in highly transparent façades should be retrofitted. In this study, sound reduction index of masonry and cavity exterior walls which consist of brick, mortar, gypsum board and mineral wool and of common window types is measured in sound insulation test rooms. The study compares and evaluates the effects of plaster, brick thickness, cavity depth, mineral wool thickness and mineral wool placement on sound reduction index values, using traditional materials and building techniques. Traditional brick wall façades and possible retrofitting of these façades are evaluated for sound insulation of bedrooms and living rooms in different noise zones, 55, 60, 65, 70 and 75 dBA, with various transparency ratios, 0%, 30%, 40%, 50% and 70%. The analysis shows that window types and single-layer walls are the deterministic factors in evaluating sound insulation in retrofitting projects and that it is not possible to provide proper aural comfort in high noise zones.

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Rychtáriková, Monika, Bert Roozen, Herbert Müllner, Mathias Stani, Vojtech Chmelík, and Christ Glorieux. "Perceived Loudness of Sound Transmitted through Light Weight and Heavy Weight Walls." Advanced Materials Research 649 (January 2013): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amr.649.101.

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When assessing the sound insulation quality of buildings constructions, policy makers and investors typically demand for single number ratings and sound insulation classes that allow for easy ranking of building products. Converting the full frequency content of a precisely measured or calculated structure into a single number, which takes into account all aspects of the insulation performance in a balanced way, is a challenging task. The recently proposed draft standard 717 proposes to take into account also frequencies below 100 Hz. This makes the single value rating even more complicated, since the transmission spectra R (dB) of walls can be qualitatively very different above and below 100 Hz, and even more, since, particularly at low frequencies, human hearing depends not only on frequency but also on the absolute sound level. This article presents a comparison between masonry and light-weight walls with different R value, in terms of the perception of loudness of typical living room, traffic noise and machinery noise transmitted through the walls. The effect of temporal and spectral features of the presented stimuli on loudness perception is analyzed.

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Kim, Inho, Jongkwan Ryu, and Sungchan Lee. "Influence of Perforated Ceiling on Floor Impact Sound Insulation in Reinforced Concrete Buildings." Acta Acustica united with Acustica 105, no. 5 (July 1, 2019): 727–31. http://dx.doi.org/10.3813/aaa.919352.

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In this study, the influence of a perforated ceiling on the floor impact sound was investigated. The floor impact sound measurements were conducted both with and without suspended ceiling including the perforated and nonperforated panel, using heavy and light weight impact sources in a reinforced concrete test building. The results indicated that the perforated ceiling with and without absorption sheet greatly reduced the resonance of floor impact sound by the non-perforated ceiling. However, the perforated ceiling without an absorption sheet did not improve the single number quantity (SNQ, rubber ball: L′iA,Fmax,V.T and tapping machine: L′n,w) for the floor impact sound insulation. The perforated ceiling with attached absorption sheet produced SNQs of 2 dB lower and higher than that produced by the non-perforated ceiling for heavy and light weight impact sources, respectively. It was also found that the improvement in the floor impact sound insulation after the installation of the perforated ceiling was related to the mass-spring-mass system, rather than the absorption area of the receiving room.

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Nastac, Silviu, Petronela Nechita, Carmen Debeleac, Cristian Simionescu, and Mihai Seciureanu. "The Acoustic Performance of Expanded Perlite Composites Reinforced with Rapeseed Waste and Natural Polymers." Sustainability 14, no. 1 (December 23, 2021): 103. http://dx.doi.org/10.3390/su14010103.

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Lignocelluloses residues from the post-harvest crop are receiving great scientific attention nowadays. Generally, the composite materials based on lignocelluloses waste present low density and weight, and better insulation properties compared with those petroleum-based. This study presents the results of experimental investigations regarding soundproofing capabilities for a composite material based on expanded perlite (EP) and natural polymers matrix (starch) reinforced with rapeseed stalks waste. The preparation of light-weight samples of composites was performed at room temperature through a mechanical mixing process of EP with starch polymers and rapeseed residues until optimum moisture content composition was obtained. Rapeseed stalks long fibers were avoided through the preliminary dry grinding procedure, and the composite was air-dried at room temperature for 48 h. Four samples of composites with different ratio of EP and rapeseed waste were considered. The evaluation of sample sound insulation characteristics was performed using the transfer-matrix method based on a four-microphone acoustic impedance tube. The paper concludes that the proposed composite provides comparative sound insulation capabilities to actual materials, with few particular aspects presented within the paper. Thus, these new materials are promising as a viable alternative to the actual large-scale utilization solutions in soundproofing applications.

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Cao, Ping, Wei Hong Xia, and Chao Nan Liu. "Study and Practice on the Performance of Soundproofing for Office Building Wall." Applied Mechanics and Materials 147 (December 2011): 132–35. http://dx.doi.org/10.4028/www.scientific.net/amm.147.132.

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Recently, the light materials have been applied in order to reduce the cost of construction. Since its soundproofing is generally poor, it presented a new problem of noise pollution for office building during our noise control projects. Based on “Acoustics - Specifications for the Design of Sound Insulation in Civilian Structure” （GBJ118-88）and taken an office and meeting room for examples in a building, the good soundproofing material was selected and researched and its performance met the noise requirement of various rooms through compared with performance of soundproofing for various wall material. As a result, the noise of office and meeting room reduced from 67.2 dB (A) and 57.3dB(A) to below 55dB(A) and 50dB(A) separately.

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Frescura, Alessia, Pyoung Jik Lee, Jeong-Ho Jeong, and Yoshiharu Soeta. "Electroencephalogram (EEG) responses to indoor sound sources in wooden residential buildings." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (August 1, 2021): 1989–98. http://dx.doi.org/10.3397/in-2021-2021.

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The present study aimed to explore relationships between physiological and subjective responses to indoor sounds. Specifically, The electroencephalograms (EEG) responses to neighbour sounds in wooden dwellings were investigated. Listening tests were performed to collect EEG data in distinct acoustics scenarios. Experimental work was carried out in a laboratory with a low background noise level. A series of impact and airborne sounds were presented through loudspeakers and subwoofer, while participants sat comfortably in the simulated living room wearing the EEG headset (B-alert X24 system). The impact sound sources were an adult walking and a child running recorded in a laboratory equipped with different floor configurations. Two airborne sounds (a live conversation and a piece of classical piano music) were digitally filtered to resemble good and poor sound insulation performances of vertical partitions. The experiment consisted of two sessions, namely, the evaluation of individual sounds and the evaluation of the combined noise sources. In the second session, pairs of an impact and an airborne sound were presented. During the listening test, electroencephalography alpha reactivity (α-EEG) and electroencephalography beta reactivity (β-EEG) were monitored. In addition, participants were asked to rate noise annoyance using an 11-point scale.

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Kropp, Wolfgang, and Tor Kihlman. "The influence of identical room dimensions on the sound insulation at low frequencies." Journal of the Acoustical Society of America 105, no. 2 (February 1999): 1258. http://dx.doi.org/10.1121/1.426022.

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Koga, Takashi. "Measurement of room‐to‐room airborne sound insulation with an access floor in a dwelling unit of condominium." Journal of the Acoustical Society of America 123, no. 5 (May 2008): 3765. http://dx.doi.org/10.1121/1.2935364.

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Dikavičius, Vidmantas, and Raimondas Bliūdžius. "AN EXPERIMENTAL INVESTIGATION OF ACOUSTIC PARAMETERS OF THE LABORATORY FOR MEASURING SOUND INSULATION OF BUILDING ELEMENTS/STATINIO ELEMENTŲ GARSO IZOLIACIJAI MATUOTI SPECIALIAI ĮRENGTOS LABORATORIJOS AKUSTINIŲ PARAMETRŲ TYRIMAS IR DERINIMAS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 7, no. 2 (April 30, 2001): 166–73. http://dx.doi.org/10.3846/13921525.2001.10531718.

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The report deals with a task of investigating and adjusting acoustic parameters of the reverberant chambers of recently built laboratory for measuring sound insulation properties of building elements (windows, doors). The reverberation time values in the source and receiving empty rooms were measured at 16 one-third-octave frequency bands. It was determined that they significantly exceed the recommended ones. After a number of measurements the reverberation time was adjusted to the allowable limits. An optimum combination of loudspeaker positions in the source room with respect to the best acoustic field diffusivity has been experimentally found. Repeatability values r were calculated from the measurements of sound reduction index of plastic window conducted under repeatability conditions. At the 16 one-third-octave frequency bands they show a good precision of the test equipment.

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Bietz, Heinrich, Sylvia Stange-Kölling, Martin Schmelzer, and Volker Wittstock. "Loss factor measurement and indications for nonlinearities in sound insulation." Building Acoustics 26, no. 1 (December 21, 2018): 21–34. http://dx.doi.org/10.1177/1351010x18819062.

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The loss factor is often determined in building acoustics by measuring the structure-borne reverberation time. To do this, elements under test are excited either by a hammer or by a shaker. In several experiments with sand-lime brick walls, measured loss factors turned out to be significantly larger when hammer excitation was used instead of shaker excitation. A thorough investigation of this effect was then performed using hammer blows of different strengths and a 250-kg shaker. This way, forces are in the same order of magnitude for both excitations. Measurement results lead to the conclusion that large forces may create a nonlinear structural response. The nonlinearity is observed for a sand-lime brick wall without plastering but not for a lightweight composite wall and also not for a monolithic concrete wall. The assumption of nonlinear behaviour is furthermore supported by an additional investigation where alarm pistol shots were used to excite a sand-lime brick wall with very large airborne sound pressure levels. The airborne sound insulation of the wall turned out to be nonlinear, that is, it increased with increasing sending room levels.

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Chojnacki, Bartlomiej, and Tadeusz Kamisinski. "Technical and electroacoustic aspects of miniature omnidirectional sound sources used in acoustic scale modeling." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A248. http://dx.doi.org/10.1121/10.0011218.

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Acoustic similarity theory allows us to create scaled room acoustic models which are simple to construct but usually difficult to measure correctly. One of the most common problems is the sound source, which works in the wide frequency range (800–40000 Hz, 500–63000 Hz) and has an omnidirectional sound propagation pattern. The lecture will present the novel approach for miniature sound sources design and creation for the most common measurement functions—laboratory objects and materials measurements (absorption, diffusion) in the scaled reverberation chamber, sound insulation scale modeling, and the room acoustic measurements in reduced models. Each of those applications has special sound source requirements, which allow us to differentiate their construction type. The most important aspects of the designing process were investigated, such as the number of transducers used and their placement, types of speakers, enclosure shape, and dimensions. The lecture will expose the sound sources used in Technical Acoustic Laboratory in AGH, Cracow, for the given measurement functions. The design recommendations developed based on FEM modeling, and experimental testing will be discussed regarding the existing objects, allowing future users to recreate in similar shape or adjust to other, predefined scale modeling measurement functions.

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Journal articles on the topic 'Sound insulation of the room'

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