Academic literature on the topic 'Sound transmission class (STC)'

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Journal articles on the topic "Sound transmission class (STC)"

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Borzym, Jim. "Acoustical performance of horizontal-sliding-panel operable partition walls." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5125–30. http://dx.doi.org/10.3397/in-2021-2974.

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Field measurements of airborne sound transmission loss were made on several operable partitions of the horizontal-sliding-panel type between conference rooms. Apparent Sound Transmission Class (ASTC) and Noise Isolation Class (NIC) ratings were computed. Very significant deviation of field-measured sound transmission ratings and manufacturers' Sound Transmission Class (STC) ratings were found. Clients were not satisfied by actual sound isolating performance. Transmission of voice was clearly audible. Some deficiencies of field conditions were found. Some deficiencies of partition installation were found. Modifications were made; acoustical performance did not change significantly.
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Lin, H. J., C. N. Wang, and Y. M. Kuo. "Characterizing the Sound Insulation of a Specially Orthotropic Multi-Layered Medium." Journal of Mechanics 23, no. 1 (March 2007): 63–68. http://dx.doi.org/10.1017/s1727719100001088.

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AbstractThis work explores the sound transmission loss provided by the orthotropic multi-layers to elucidate the sound insulation of FRP (Fiber Reinforced Plastics). Mat is the major material considered in the numerical works. The transfer matrices of a single layer of the orthotropic laminate and the fluid are determined. Further, the boundary conditions on the various interface planes are arranged into matrix form. Combining the transfer matrixes and the boundary conditions and applying the transfer matrix method (TMM) yields the surface impedance and the sound transmission loss. The sound-propagation characteristics are studied. Additionally, the STC (Sound Transmission Class) of FRP and steel are compared and discussed.
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Qian, Cheng, Lin Hu, Christian Dagenais, and Sylvain Gagnon. "Acoustic design tools for estimation of sound insulation performance of wood wall and floor assemblies." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 267–74. http://dx.doi.org/10.3397/in-2021-1384.

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The National Building Code of Canada 2015 stipulates the minimum requirements of the airborne sound insulation transmission through common interior walls and ceiling/floor assemblies. The required minimum Apparent Sound Transmission Class (ASTC) is 47 in Canada, whereas the Impact Insulation Class (IIC) for floors is recommended to be higher than 55. For many years, significant efforts were made to develop sound insulation prediction models or tools to predict the sound insulation performance of wall and floor/ceiling assemblies at the design phase in order to meet the requirements and the recommendations made by codes. However, today few models can provide a reliable acoustics design tool. In this document, three prediction tools thought to be practically useful are presented and evaluated. Between these three prediction tools, one is an analytical model of the Insul software while the other two are empirical models developed by the National Research Council of Canada and the American Wood Council. This paper compared the STC and IIC ratings of wood wall and floor assemblies estimated by these three models and verified them by the measured STC and IIC ratings. This work aims at providing an idea for readers to choose a suitable design tool to proceed with their acoustic designs.
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Conroy, James. "Analysis of practical sound transmission class (STC) measurements performed under a variety of field conditions." Journal of the Acoustical Society of America 114, no. 4 (October 2003): 2306–7. http://dx.doi.org/10.1121/1.4780906.

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Hossain, K. M. A., and M. Lachemi. "Thermal Conductivity and Acoustic Performance of Volcanic Pumice Based Composites." Materials Science Forum 480-481 (March 2005): 611–16. http://dx.doi.org/10.4028/www.scientific.net/msf.480-481.611.

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Volcanic Pumice (VP) is found abundantly in various parts of the world. In this study, VP from East New Britain province of Papua New Guinea is investigated and assessed for its industrial utilization. The manufacturing of heat-insulating lightweight concrete, building blocks or composites using VP is of prime importance as an energy saver. The utilization of VP as a heatinsulating material is tested and the results are found to satisfy the ASTM requirements. This fact suggests that VP could be utilized in the manufacture of composite building blocks or concrete. Acoustic performance of composite building floors with lightweight volcanic pumice concrete (VPC) is also described based on the performance of normal concrete (NC) and Code based requirements. The performance of VPC and NC composite floors is judged based on Sound Transmission Class (STC) or Impact Insulation Class (IIC) values. VPC composite floors exhibit better acoustic performance than their NC counterparts and seem to achieve the requirements of Codes of various countries.
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Ang, Linus, Yong Koh, and Heow Lee. "Plate-Type Acoustic Metamaterials: Experimental Evaluation of a Modular Large-Scale Design for Low-Frequency Noise Control." Acoustics 1, no. 2 (April 1, 2019): 354–68. http://dx.doi.org/10.3390/acoustics1020019.

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For industrial applications, the scalability of a finalised design is an important factor to consider. The scaling process of typical membrane-type acoustic metamaterials may pose manufacturing challenges such as stress uniformity of the membrane and spatial consistency of the platelet. These challenges could be addressed by plate-type acoustic metamaterials with an internal tonraum resonator. By adopting the concept of modularity in a large-scale design (or meta-panel), the acoustical performance of different specimen configurations could be scaled and modularly combined. This study justifies the viability of two meta-panel configurations for low-frequency (80–500 Hz) noise control. The meta-panels were shown to be superior to two commercially available noise barriers at 80–500 Hz. This superiority was substantiated when the sound transmission class (STC) and the outdoor-indoor transmission class (OITC) were compared. The meta-panels were also shown to provide an average noise reduction of 22.7–27.4 dB at 80–400 Hz when evaluated in different noise environments—traffic noise, aircraft flyby noise, and construction noise. Consequently, the meta-panel may be further developed and optimised to obtain a design that is lightweight and yet has good acoustical performance at below 500 Hz, which is the frequency content of most problematic noises.
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Gernhart, Elzo F. "Case study of modifications to a wood ‘‘I’’ beam framed floor‐ceiling assembly which did not meet minimum International Building Code (IBC) impact insulation class (IIC) or sound transmission class (STC)." Journal of the Acoustical Society of America 118, no. 3 (September 2005): 1919–20. http://dx.doi.org/10.1121/1.4780469.

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Godfrey, Richard D., Harry Alter, and Clarke Berdan. "Sound transmission class (STC) is not a good predictor of performance of insulated wood frame gypsum walls used as interior partitions in most North American homes." Journal of the Acoustical Society of America 118, no. 3 (September 2005): 1844. http://dx.doi.org/10.1121/1.4778513.

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LoVerde, John, and David W. Dong. "Comparison of Sound Transmission Class and Outdoor-Indoor Transmission Class for specification of exterior facade assemblies." Journal of the Acoustical Society of America 141, no. 5 (May 2017): 3539. http://dx.doi.org/10.1121/1.4987477.

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Latour, Jean-François. "Partition intersections and their effect on transmission loss and apparent sound transmission class." Journal of the Acoustical Society of America 133, no. 5 (May 2013): 3534. http://dx.doi.org/10.1121/1.4806376.

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Dissertations / Theses on the topic "Sound transmission class (STC)"

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

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Environmental noise at high levels and inappropriate construction techniques used in conventional buildings in Brazil claim for a transition to better construction systems. Recently the Brazilian standard NBR 15575:2013 established for the first time parameters and criteria for residential building performance. In standard minimum requirements for sound insulation are given, for example for external walls and roof structures. This way it is of fundamental importance to have sound transmission loss data for diferente types of such elements at hand. Taking into account that there is very little information on the sound transmission loss of external walls of the light steel frame (LSF) type measurements of sound insulation of different vertical external LSF walls typically used in Brazil were carried out. Eighteen different LSF walls were mounted in the sound transmission measurement chamber of the Federal University of Santa Maria and measurements were carried out in accordance with ISO 10140:2010. Sound insulation was characterized by means of the sound reduction index R, the weighted sound reduction index Rw and the sound transmission class, making it possible to compare the sound insulation of the LSF walls with data from the literature. The LSF walls under investigation in this study used different materials such as OSB panels, cement boards, plaster boards, Smartside panels, PVC panels, XPS panels and magnesium oxide boards for the outer face. The influence of resilient channels and sponge tape, placed between the outer face and the metalic studes, were also evaluated. The sound insulation of the diferente LSF walls were found to be 43 dB ≤ Rw ≤ 50 dB and 45 dB ≤ STC ≤ 52 dB. Within the LSF walls measured the one which used magnesium oxide boards on the outer face showed to have the highest weight sound reduction index (Rw = 50 dB). Resilient channels, fabricated especially for this study, and sponge tape were able to provide an increase of Rw and STC up to 5 dB compared to the same wall without this resilient elements, and provide better sound insulation especially for frequencies higher than 400 Hz. From the data it can be concluded that LSF walls are more efficient regarding the sound insulation than single walls of the same surface mass and in some cases even better than single walls of superior surface mass, such as walls made of massive brick or concrete blocks.
O excesso de ruído ambiental e as inadequadas técnicas construtivas dos sistemas convencionais utilizados no mercado da construção civil brasileira, fazem com que seja necessária a introdução de novas tecnologias construtivas mais racionais e produtivas. A partir da entrada em vigor da NBR 15575:2013 foram estabelecidos diversos parâmetros de desempenho para edificações habitacionais. A referida norma também estabelece exigências mínimas de isolamento acústico para os sistemas que compõem as edificações, entre eles, as vedações verticais. Desta forma, informações sobre o isolamento acústico providenciado pelos diferentes sistemas construtivos tornaram-se de fundamental importância. Tendo em vista a pouca informação existente na literatura sobre o isolamento sonoro de paredes externas em light steel frame (LSF), foram realizadas medições de perda de transmissão sonora em paredes externas executadas neste sistema construtivo, usadas tipicamente no mercado brasileiro. Dezoito composições de paredes em LSF foram montadas na câmara reverberante de transmissão sonora da UFSM para realização dos ensaios de perda de transmissão conforme procedimentos propostos pela ISO 10140:2010. O isolamento sonoro foi quantificado a partir dos espectros do índice de redução sonora R, pelo índice de redução sonora ponderado Rw e pela classe de transmissão sonora STC, facilitando a comparação entre diferentes composições de parede e dados de isolamento sonoro encontrados na bibliografia. Os principais materiais utilizados no revestimento das paredes LSF foram paineis OSB, placas cimentícias, placas de gesso acartonado, réguas Smartside, réguas de siding vinílico, painéis XPS e placas de óxido de magnésio. A influência da utilização de barras resilientes e fitas de espuma de PVC, entre as placas de revestimento e a estrutura metálica, também foi avaliada. Determinou-se que o isolamento sonoro das diferentes paredes LSF avaliadas é de 43 dB ≤ Rw ≤ 50 dB e 45 dB ≤ STC ≤ 52 dB. Dentre as paredes externas em LSF, aquela que utilizou placas de óxido de magnésio na face exterior apresentou o maior Rw = 50 dB. As barras resilientes e fitas de espuma de PVC foram capazes de aumentar o Rw e STC em até 5 dB, se comparado à parede semelhante sem estes dispositivos, especialmente nas frequências a partir de 400 Hz. A partir da análise dos dados, concluiu-se que as paredes LSF consideradas paredes duplas são mais eficientes no isolamento sonoro quando comparadas às paredes simples ou homogêneas de mesma massa e até do que algumas paredes com massa muito superior, como paredes de tijolos maciços, de blocos de concreto ou de blocos cerâmicos.
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Books on the topic "Sound transmission class (STC)"

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Summary report for consortium on fire resistance and sound insulation of floors: Sound transmission class and impact insulation class results. [Ottawa]: CMHC, 2000.

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Book chapters on the topic "Sound transmission class (STC)"

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Eargle, John M. "Sound Transmission Class (STC) Curves." In Electroacoustical Reference Data, 18–19. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2027-6_9.

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Bourguet, Marie-Luce. "An Overview of Multimodal Interaction Techniques and Applications." In Encyclopedia of Human Computer Interaction, 451–56. IGI Global, 2006. http://dx.doi.org/10.4018/978-1-59140-562-7.ch068.

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Desktop multimedia (multimedia personal computers) dates from the early 1970s. At that time, the enabling force behind multimedia was the emergence of the new digital technologies in the form of digital text, sound, animation, photography, and, more recently, video. Nowadays, multimedia systems mostly are concerned with the compression and transmission of data over networks, large capacity and miniaturized storage devices, and quality of services; however, what fundamentally characterizes a multimedia application is that it does not understand the data (sound, graphics, video, etc.) that it manipulates. In contrast, intelligent multimedia systems at the crossing of the artificial intelligence and multimedia disciplines gradually have gained the ability to understand, interpret, and generate data with respect to content. Multimodal interfaces are a class of intelligent multimedia systems that make use of multiple and natural means of communication (modalities), such as speech, handwriting, gestures, and gaze, to support human-machine interaction. More specifically, the term modality describes human perception on one of the three following perception channels: visual, auditive, and tactile. Multimodality qualifies interactions that comprise more than one modality on either the input (from the human to the machine) or the output (from the machine to the human) and the use of more than one device on either side (e.g., microphone, camera, display, keyboard, mouse, pen, track ball, data glove). Some of the technologies used for implementing multimodal interaction come from speech processing and computer vision; for example, speech recognition, gaze tracking, recognition of facial expressions and gestures, perception of sounds for localization purposes, lip movement analysis (to improve speech recognition), and integration of speech and gesture information. In 1980, the put-that-there system (Bolt, 1980) was developed at the Massachusetts Institute of Technology and was one of the first multimodal systems. In this system, users simultaneously could speak and point at a large-screen graphics display surface in order to manipulate simple shapes. In the 1990s, multimodal interfaces started to depart from the rather simple speech-and-point paradigm to integrate more powerful modalities such as pen gestures and handwriting input (Vo, 1996) or haptic output. Currently, multimodal interfaces have started to understand 3D hand gestures, body postures, and facial expressions (Ko, 2003), thanks to recent progress in computer vision techniques.
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Bourguet, Marie-Luce. "An Overview of Multimodal Interaction Techniques and Applications." In Human Computer Interaction, 95–101. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-87828-991-9.ch008.

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Desktop multimedia (multimedia personal computers) dates from the early 1970s. At that time, the enabling force behind multimedia was the emergence of the new digital technologies in the form of digital text, sound, animation, photography, and, more recently, video. Nowadays, multimedia systems mostly are concerned with the compression and transmission of data over networks, large capacity and miniaturized storage devices, and quality of services; however, what fundamentally characterizes a multimedia application is that it does not understand the data (sound, graphics, video, etc.) that it manipulates. In contrast, intelligent multimedia systems at the crossing of the artificial intelligence and multimedia disciplines gradually have gained the ability to understand, interpret, and generate data with respect to content. Multimodal interfaces are a class of intelligent multimedia systems that make use of multiple and natural means of communication (modalities), such as speech, handwriting, gestures, and gaze, to support human-machine interaction. More specifically, the term modality describes human perception on one of the three following perception channels: visual, auditive, and tactile. Multimodality qualifies interactions that comprise more than one modality on either the input (from the human to the machine) or the output (from the machine to the human) and the use of more than one device on either side (e.g., microphone, camera, display, keyboard, mouse, pen, track ball, data glove). Some of the technologies used for implementing multimodal interaction come from speech processing and computer vision; for example, speech recognition, gaze tracking, recognition of facial expressions and gestures, perception of sounds for localization purposes, lip movement analysis (to improve speech recognition), and integration of speech and gesture information. In 1980, the put-that-there system (Bolt, 1980) was developed at the Massachusetts Institute of Technology and was one of the first multimodal systems. In this system, users simultaneously could speak and point at a large-screen graphics display surface in order to manipulate simple shapes. In the 1990s, multimodal interfaces started to depart from the rather simple speech-and-point paradigm to integrate more powerful modalities such as pen gestures and handwriting input (Vo, 1996) or haptic output. Currently, multimodal interfaces have started to understand 3D hand gestures, body postures, and facial expressions (Ko, 2003), thanks to recent progress in computer vision techniques.
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Conference papers on the topic "Sound transmission class (STC)"

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Latour, Jean-François. "Partition intersections and their effects on transmission loss and apparent sound transmission class." In ICA 2013 Montreal. ASA, 2013. http://dx.doi.org/10.1121/1.4800647.

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Farid, Mohammad, Diah Susanti, Agung Purniawan, Mavindra Ramadhani, and Reyhan Efriansyah. "Level enhancement of sound transmission class of fiber reinforced polyester composite by adding nanocellulose." In 1ST INTERNATIONAL SEMINAR ON ADVANCES IN METALLURGY AND MATERIALS (i-SENAMM 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015763.

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Xingsheng, Lao, Peng Xu, Yao Shiwei, and Ming Pingjian. "Study of Vibration and Sound Transmission Characteristics in Condenser Pipe System." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66767.

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Effect of surrounding fluid or steam flow fluctuation on internal flow fluctuation in heat transfer pipe is analyzed based on fluid and structure interaction simulation by using commercial code Ansys workbench. Simulation results show that the effect of surrounding steam could be ignored, as the difference between pipe wall vibration level actuated by surrounding fluid flow and that actuated by surrounding steam flow is very notable. The results also show the internal flow pressure fluctuation spectrum is well in accordance with that of surrounding flow. Then the effect of surrounding fluid fluctuation on internal flow noise transmission in heat transfer pipe is taken into considered and the insertion loss of circulation coolant water flow noise between condenser inlet and outlet is calculated by a matrix transfer method developed in this paper. An experiment on 3t/h class condenser system is conducted, the experimental results of insertion loss of vibration level and coolant flow noise between condenser inlet and outlet is a little larger than the calculated results, as the effect of condense shell structure is not considered in the model. It can be concluded that, 1, internal coolant flow and the pipe structure are closely coupled, and hereby flow fluctuation is an important contribution to pipe vibration level in condenser pipe system. 2, surrounding flow actuating vibration of heat transfer pipe is mostly induced by condensate fluctuation at the bottom area while the top area steam flow fluctuation induced pipe vibration is neglectable. 3, insertion loss of vibration level and coolant flow noise between condenser inlet and outlet changes little as operation condition changes.
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Stewart, Noral. "Outdoor to indoor A-weighted sound level reduction of typical modular classrooms and assessment of potential performance improvements based on the outdoor-indoor transmission class spectrum." In 156th Meeting Acoustical Society of America. ASA, 2009. http://dx.doi.org/10.1121/1.3077031.

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Berry, Alain, Rémy Oddo, Raymond Panneton, and Jean Nicolas. "Reducing the Noise of Pressure Pulp Screen: Theory and Application." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0453.

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Abstract A pressure pulp screen is a machine used in the pulp and paper industry to remove and class cellulose fibres in paper pulp. It involves an inner perforated cylindrical basket which receives the pulp under pressure, an inner rotor with profiled blades used to clear the holes or slits of the basket, and an outer cylindrical shell. The noise radiated by the outer shell is characterized by discrete frequencies in mid- and high frequency (1–4 kHz). A preliminary study has shown that the radiated noise is due to the vibration of the perforated basket under the moving load of the rotor. This vibration is transmitted to the outer shell through various paths which were analyzed and classified. An analytical model of the vibroacoustic behavior of a cylindrical shell under a circumferentially moving load was used to establish various rotating speed regimes with respect to the vibration and sound radiation of the shell. It was shown that a circumferential modulation of the load (corresponding to the effect of holes or slits on the inner basket) leads to theoretical noise spectra similar to measured data. On the practical front, the model was used to identify significant design parameters with respect to the noise of the machine. The paths of energy transmission from the basket to the outer shell were studied and various noise reduction approaches have been investigated.
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Palanivelu, Sakthivel, and Krishna Kumar Ramarathnam. "Synthesis of Structure Borne Vehicle Interior Noise due to Tire/Road Interaction." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46083.

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The pneumatic tire is one of the important sources of noise and vibration in a vehicle. Modern vehicles have implemented good preventive and control measures for power unit and aerodynamic NVH. Hence, the tire/road interaction has become a dominant source. Riegel and Wiedemann [1] have reported the dominance of tire/road interaction over engine and wind sources, in contributing to vehicle interior noise. Vehicle interior noise due to tire/road interaction consists of two components, namely structure borne noise caused due to low frequency excitation (below 500 Hz) and air borne component which are due to mid and high frequency excitation (above 500 Hz). Experimental Transfer Path Analysis (TPA) is a tool to identify whether the source or transmission path needs to be altered for reducing the cabin noise. This paper describes the successful implementation of experimental TPA to synthesize structure borne vehicle interior noise due to tire/road interaction on a sedan class passenger car. As a first step, the required local structural Frequency Response Functions (FRFs) and Noise Transfer Functions (NTFs) are determined in the laboratory for the vehicle without tire/wheel assembly by hammer impact test, by hitting at the spindle interface (paths). The second step is to repeat the test with tire/wheel assembly by an impact on the tire at the contact patch to get the same set of structural FRFs. The third step is to conduct a road test. The operational acceleration responses as well as interior sound pressure levels are measured for both engine on and off conditions for the same measurement points considered during the laboratory tests. These operational data are further combined with local structural FRFs of the vehicle to estimate the operational loads at the transfer paths using matrix inversion method. Then, the NTFs are multiplied with operational loads to synthesis the contribution of individual paths to the total structure borne vehicle interior noise. Lastly, path and vector contribution analysis are carried out from the TPA results to identify the critical paths for the critical frequencies. Moreover in this work the TPA is not only used to synthesize the structure borne interior noise, but also to estimate the road input excitation. Hence the tire force transmissibility from contact patch to vehicle spindle is determined. The estimated road excitation can be used in a parametric study to address the influence of tire design in contributing to structure borne vehicle interior noise.
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