Relevant bibliographies by topics / Acoustic noise

Academic literature on the topic 'Acoustic noise'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 July 2024

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Journal articles on the topic "Acoustic noise"

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Arnold, Eliot. "Advancements in nanotechnology for acoustic management in pickleball." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A328. http://dx.doi.org/10.1121/10.0027695.

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This research investigates the use of advanced nano-fiber technology for sound and noise management in pickleball courts. The technology, known for its flexibility and adaptability, addresses the unique acoustic challenges of pickleball, a sport with a distinctive noise profile characterized by impulsive and unpredictable sounds. These nano-fibers are particularly effective in absorbing mid to high-frequency noises (800–5000 Hz) common in pickleball. Incorporating these nano-fibers into acoustic foams and textiles significantly enhances sound absorption, allowing for thinner materials while doubling performance compared to conventional materials. These fibers, about 1/500th the diameter of human hair, have a high surface area to volume ratio, aiding in sound scattering and increased friction with air molecules. This structure enables the efficient transformation of sound energy into heat, which is then effectively dissipated. Aligned with the Acoustical Society of America's standards, this abstract emphasizes a scientific breakthrough in sports acoustics, contributing to the reduction in urban noise pollution. The study underscores the impact of cutting-edge material technology in improving environmental acoustics and community well-being.
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Woolworth, David S. "Architectural acoustics: Buildings and beyond." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A28. http://dx.doi.org/10.1121/10.0026671.

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Architectural acoustics not only covers buildings and the environment around them but also human perception of the acoustic environment, indoors and outdoors. As a technical committee of the acoustical society, our members are spread over research, academia, practitioners and industry. Architectural acoustics is not reserved for concert halls and opera houses but applies to all occupied spaces and has a direct impact on quality of life of any user of the space. Specific topics within the discipline include but are not limited to environmental sound, speech privacy, and speech intelligibility, simulated acoustic environments, annoyance, human hearing, airborne and structureborne noise, sound and impact isolation, loudspeakers and microphones, room acoustics, soundscape, and acoustical measurements. The technical committee on noise is often a cosponsor of specials sessions by the TCAA, as noise control via architectural means is common practice. This presentation will provide an overview of the TCAA and the field of architectural acoustics and provide examples of current research and projects of interest.
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Kurra, Selma, and Ayca Sentop. "Interaction between annoyance, indoor noise levels and acoustic classification of buildings." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 1 (February 1, 2023): 6519–30. http://dx.doi.org/10.3397/in_2022_0980.

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Assessment of annoyance "at home" from environmental noises has been widely investigated so far and the ISO/TS 15666:2021 was developed to lead the socio-acoustic surveys. On the other hand, the rating of buildings' acoustical performance considering also the indoor noises, has been also well concerned in building acoustics and the studies have ended up with the ISO/TS 19488:2021 covering the acoustic classification system for buildings. Basically the rating system needs to be supported by the subjective tests in the field or in laboratories, to acquire data about the annoyance/disturbance or satisfaction of residents. If the target is to design the healthy, comfortable and sustainable acoustical environment, both technical standards might be harmonized in the future. In this paper, based on the dose/response relationships with respect to the indoor noise levels, an approach is proposed to translate the acoustic classes proposed in ISO/TS 19488, into the annoyance boundaries in terms of different scales (verbal/numerical and the HA% ) referred in ISO/TS 15666. The results from the previous laboratory and field studies conducted by the authors, have been used for verification of this approach.
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Lai, Heather L., Anne C. Balant, and Chih-Yang Tsai. "Machine learning for analysis of wind farm noise." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A278. http://dx.doi.org/10.1121/10.0027495.

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Two challenges associated with analyzing acoustical data from wind farms are: 1) separating turbine sounds from environmental sounds and 2) classifying acoustical samples into different types of wind turbine noise based on acoustic characteristics. Machine-learning methods for classifying general environmental sounds have been developed using large human classified databases (e.g., YAMNet), but only a few studies have targeted classification of wind farm noise (WFN) specifically. Techniques for classifying wind farm noise have focused on identification of amplitude modulation (AM) using both traditional methods such as low frequency peak prominence (IOA method) and machine learning methods using both targeted AM acoustics features and more general deep acoustic features. To address these two challenges, we are developing a multi-echelon machine learning framework to identify and classify noise from wind farms using publicly available windfarm data and open-source software. The first echelon provides an automated method for identifying WFN samples that are free of environmental sounds. The second echelon uses machine learning to classify these wind farm noises according to the degree of AM, prominent tones, and other factors that might contribute to the human response and are incorporated in the metrics used or potentially used to assess compliance with regulations.
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Wróbel, Jakub, and Damian Pietrusiak. "Noise Source Identification in Training Facilities and Gyms." Applied Sciences 12, no. 1 (December 22, 2021): 54. http://dx.doi.org/10.3390/app12010054.

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This paper deals with noise problems in industrial sites adapted for commercial training venues. The room acoustics of such an object were analyzed in the scope of the reverberation time and potential acoustic adaptation measures are indicated. Identification and classification of noise sources in training facilities and gyms was carried out based on the acoustic measurements. The influence of rubber padding on impact and noise reduction was investigated in the case of chosen noise-intensive exercise activities performed in a previously described acoustic environment. Potential noise reduction measures are proposed in the form of excitation reduction, vibration isolation, and room acoustics adaptation.
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Chai, Yuying, and Boya Yu. "Effect of rail traffic noises on the perception of the acoustic environment in office spaces." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 6 (November 30, 2023): 2324–32. http://dx.doi.org/10.3397/in_2023_0342.

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This study conducted a laboratory experiment to investigate the effect of rail traffic noise on the perception of the acoustic environment in office spaces. The study considered two types of experiment stimuli, single noise, and combined noise. The single noise stimuli consisted of silence (SL), air conditioning noise (AC), irrelevant speech (SP), and six types of traffic noise (Tr). Traffic noise included road (R), maglev (Ma), tram (T), conventional train (C), high-speed train (H), and metro (Me). The combined noise stimuli used air conditioning sound and speech as background noise and combined with six types of traffic noise to form the experimental stimuli. Thirty subjects took part in laboratory experiments in which the acoustic environment was rated on two aspects: noise disturbance and acoustic comfort. Under single noises, the results showed that the noise source had a significant negative effect on the evaluation of the acoustic environment. The influence of traffic noises varied with the traffic type, which was lower and higher than that of irrelevant speech and air conditioning noise, respectively. Under combined acoustic conditions, acoustic comfort was affected by the main effects of background noise type, traffic noise type, and traffic noise level. In addition to the main effects, noise disturbance was also influenced by the interaction between traffic noise level and background noise type, and between traffic noise level and traffic noise type. Keywords: rail traffic noise; office space; acoustic environment; acoustic comfort; noise disturbance
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Ellison, Steve, Pierre Germain, and Roger Schwenke. "Making a room ready and ensuring success for active acoustics systems." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A169. http://dx.doi.org/10.1121/10.0023160.

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Active Acoustics systems can be thought of as reducing the effective absorption of a room and/or increasing its effective volume and depend upon well-designed acoustic treatment and room shaping. Because Active Acoustics systems cannot reduce HVAC noise or improve isolation, these associated acoustical properties depend on the room’s acoustical design. Therefore, a successful Active Acoustic system installation relies on coordination with the acoustical consultant, from conceptual design to scheduling initial rehearsals with the various performance groups that utilize the room. Installation examples from around the world, including Australasia, are provided to illustrate lessons learned for developing successful projects.
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Ishikawa, Kenji. "On the sensitivity and noise of acousto-optic sensing: Exploring the detection limits." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A260. http://dx.doi.org/10.1121/10.0027425.

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Acousto-optic sensing has garnered increasing attention in recent years due to its non-contact nature, gaining importance in a range of acoustic measurement applications. Although its potential is widely recognized, the signal-to-noise ratio often requires enhancement in practical applications, which can impede further development. While more sensitive measurement methods have been evolving, the discussion around noise and detection limits in acousto-optic sensing remains limited. This presentation will highlight the author's recent findings on sensitivity and noise in acousto-optic sensing. It aims to illuminate the achievable detection limits through a detailed analysis of optical and acoustic noises. The insights provided will offer a deeper understanding of the complexities involved and potentially guide future advancements in this field.
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Acosta, Oscar, Luis Hermida, Marcelo Herrera, Carlos Montenegro, Elvis Gaona, Mateo Bejarano, Kevin Gordillo, Ignacio Pavón, and Cesar Asensio. "Remote Binaural System (RBS) for Noise Acoustic Monitoring." Journal of Sensor and Actuator Networks 12, no. 4 (August 14, 2023): 63. http://dx.doi.org/10.3390/jsan12040063.

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The recent emergence of advanced information technologies such as cloud computing, artificial intelligence, and data science has improved and optimized various processes in acoustics with potential real-world applications. Noise monitoring tasks on large terrains can be captured using an array of sound level meters. However, current monitoring systems only rely on the knowledge of a singular measured value related to the acoustic energy of the captured signal, leaving aside spatial aspects that complement the perception of noise by the human being. This project presents a system that performs binaural measurements according to subjective human perception. The acoustic characterization in an anechoic chamber is presented, as well as acoustic indicators obtained in the field initially for a short period of time. The main contribution of this work is the construction of a binaural prototype that resembles the human head and which transmits and processes acoustical data on the cloud. The above allows noise level monitoring via binaural hearing rather than a singular capturing device. Likewise, it can be highlighted that the system allows for obtaining spatial acoustic indicators based on the interaural cross-correlation function (IACF), as well as detecting the location of the source on the azimuthal plane.
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Bergiadis, Willaim L. "Acoustic treatments for indoor and outdoor firing ranges." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A160. http://dx.doi.org/10.1121/10.0015883.

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Small-caliber firearms can produce impulse noises that frequently exceed 150 dB peak sound pressure level (dB pSPL) and can approach 185 dB pSPL. These impulse noises can present a significant risk for noise-induced hearing loss for the unprotected ear and pose a risk for persons wearing hearing protection that is possibly poorly fitted or insufficient. For range safety officers and personnel who work in the firing range on a regular basis, the daily cumulative effects of noise exposure can lead to increased fatigue and stress. Acoustic treatments of the reflective surfaces can mitigate these health risks. This paper will review some community noise guidelines as well as health and safety regulations. As a manufacturer of acoustic range treatments, the Troy System materials will be reviewed with regards to their laboratory performance and their capabilities to reduce noise in various firing ranges. One aspect of performance that may be overlooked is the safety features of the materials which Troy Acoustics provides, such as flammability, ability to be cleaned, and the resistance to moisture and mold.
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Dissertations / Theses on the topic "Acoustic noise"

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Epifanio, Chad Lawrence. "Acoustic daylight : passive acoustic imaging using ambient noise /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823704.

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Zheng, Haosheng, and Kaichun Zhang. "Noise Analysis of Computer Chassis and Secondary Sound Source Noise Reduction." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18547.

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This article focuses on computer noise analysis and noise reduction processing. With the popularity of computers, people are increasingly demanding the comfort of using computers. Solving the noise problem of the computer case can make the working environment more comfortable. People working in a noisy environment for a long time can cause anxiety and the quality of work is not high. The main purpose of this paper is to analyse the characteristics of computer noise and to reduce the noise of the chassis through the secondary sound source. Through the comparison of the experimental and simulation results, the noise reduction effect of the secondary sound source on the computer case is obtained. This paper can provide a scientific reference for the manufacture of computer chassis and improvement of noise.
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Copley-Woods, Djuna S. (Djuna Sunlight) 1977. "Aircraft interior acoustic noise control." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9330.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
Includes bibliographical references (p. 45).
An experimental study was perfonned to determine which materials are best suited for internal aircraft noise reduction. An impedance tube with dimensions of a scaled aircraft was constructed and evaluated, and eleven materials were tested and compared based on their noise reduction properties, weight, and thickness. Polyvinylidene Fluoride was tested for use in active noise control for a large space.
by Djuna S. Copley-Woods.
S.B.
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Creasy, Miles Austin. "Adaptive Collocated Feedback for Noise Absorption in Acoustic Enclosures." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/45209.

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This thesis focuses on adaptive feedback control for low frequency acoustic energy absorption in acoustic enclosures. The specific application chosen for this work is the reduction of high interior sound pressure levels (SPL) experienced during launch within launch vehicle payload fairings. Two acoustic enclosures are used in the research: the first being a symmetric cylindrical duct and the other being a full scale model of a payload fairing. The symmetric cylindrical duct is used to validate the ability of the adaptive controller to compensate for large changes in the interior acoustical properties. The payload fairing is used to validate that feedback control, for a large geometry, does absorb acoustic energy. The feedback controller studied in this work is positive position feedback (PPF) used in conjunction with high and low pass Butterworth filters. An algorithm is formed from control experiments for setting the filter parameters of the PPF and Butterworth filters from non-adaptive control simulations and tests of the duct and payload fairing. This non-adaptive control shows internal SPL reductions of 2.2 dB in the cylindrical duct for the frequency range from 100 to 500 Hz and internal SPL reductions of 4.2 dB in the full scale fairing model for the frequency range from 50 to 250 Hz. The experimentally formed control algorithm is then used as the basis for an adaptive controller that uses the collocated feedback signal to actively tune the control parameters. The cylindrical duct enclosure with a movable end cap is used to test the adaptation properties of the controller. The movable end cap allows the frequencies of the acoustic modes to vary by more than 20 percent. Experiments show that a 10 percent change in the frequencies of the acoustic modes cause the closed-loop system to go unstable with a non-adaptive controller. The closed-loop system with the adaptive controller maintains stability and reduces the SPL throughout the 20 percent change of the acoustic modes' frequencies with a 2.3 dB SPL reduction before change and a 1.7 dB SPL reduction after the 20 percent change.
Master of Science
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Sun, Guohua. "Active Control of Impact Acoustic Noise." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1413542213.

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Griffin, Steven F. "Acoustic replication in smart structure using active structural/acoustic control." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/13085.

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Fuller, Ryan Michael. "Adaptive Noise Reduction Techniques for Airborne Acoustic Sensors." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1355361066.

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Kumar, Ashok. "Active structural-acoustic control of interior noise in vibro-acoustic cavities." Thesis, IIT Delhi, 2016. http://localhost:8080/iit/handle/2074/7036.

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Davies, Jonathan James. "Underwater acoustic communications." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289679.

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Shou, Xingxian. "The Suppression of Selected Acoustic Noise Frequencies in MRI." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1281404517.

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Books on the topic "Acoustic noise"

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K, Zaveri, ed. Acoustic noise measurements. 5th ed. Naerum (Denmark): Brüel & Kjaer, 1988.

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Harris, Ray. Management of acoustic noise. London: H.M.S.O.[for] CCTA, 1994.

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Hänsler, Eberhard, and Gerhard Schmidt. Acoustic Echo and Noise Control. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/0471678406.

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Hänsler, E. Acoustic Echo and Noise Control. New York: John Wiley & Sons, Ltd., 2005.

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Gerhard, Schmidt, ed. Acoustic echo and noise control. Hoboken, N.J: Wiley-Interscience, 2004.

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Uosukainen, Seppo. Properties of acoustic energy quantities. Espoo, Finland: Valtion teknillinen tutkimuskeskus, 1989.

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Gurovich, Yuriy A. Acoustic beamforming: Mapping sources of truck noise. Washington, D.C: Transportation Research Board, 2009.

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Civil War acoustic shadows. Shippensburg, Pa: White Mane Books, 2001.

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Hänsler, Eberhard, and Gerhard Schmidt, eds. Topics in Acoustic Echo and Noise Control. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-33213-8.

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Donavan, Paul R., Yuriy A. Gurovich, Kenneth J. Plotkin, Daniel H. Robinson, and William K. Blake. Acoustic Beamforming: Mapping Sources of Truck Noise. Washington, D.C.: National Academies Press, 2009. http://dx.doi.org/10.17226/14311.

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Book chapters on the topic "Acoustic noise"

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Soueid, Ahmad, E. Clayton Teague, and James Murday. "Acoustic Noise." In Buildings for Advanced Technology, 55–69. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24892-9_5.

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Weik, Martin H. "acoustic noise." In Computer Science and Communications Dictionary, 16. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_204.

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Shahidan, Shahiron, and Nurul Izzati Raihan Ramzi Hannan. "Environmental Noise." In Acoustic And Non-Acoustic Performance Coal Bottom Ash Concrete, 15–24. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7463-4_3.

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Weik, Martin H. "ambient acoustic noise." In Computer Science and Communications Dictionary, 42. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_573.

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Coates, Rodney F. W. "Noise and Reverberation." In Underwater Acoustic Systems, 90–111. London: Macmillan Education UK, 1990. http://dx.doi.org/10.1007/978-1-349-20508-0_6.

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Fischer, Raymond, and Leonid Boroditsky. "Acoustic Criteria." In Noise and Vibration Control on Ships, 33–70. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55170-3_3.

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Lin, Hejie, Turgay Bengisu, and Zissimos P. Mourelatos. "Acoustic Intensity and Specific Acoustic Impedance." In Lecture Notes on Acoustics and Noise Control, 81–116. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88213-6_4.

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Lin, Hejie, Turgay Bengisu, and Zissimos P. Mourelatos. "Acoustic Waveguides." In Lecture Notes on Acoustics and Noise Control, 197–226. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88213-6_8.

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Hermawanto, Denny. "Acoustic Measurement Traceability." In Handbook of Vibroacoustics, Noise and Harshness, 1–29. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4638-9_29-1.

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Esperandieu, J. L. "Mediterranean Underwater Ambient Noise Model." In Underwater Acoustic Data Processing, 141–47. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2289-1_14.

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Conference papers on the topic "Acoustic noise"

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Cleaver, Ryan, Richard Lawrence Brouckaert, and Andrew Skestone. "Automotive OEM Barrier Acoustical Performance – The Ideal Application for Carbon Neutral Materials." In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-1049.

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<div class="section abstract"><div class="htmlview paragraph">The automotive acoustics arena is rich with application opportunities for carbon neutral or climate positive parts. The design of potential “green” NVH solutions however cannot compromise the intended acoustical performance of the vehicles. This paper investigates the acoustical needs of OEM vehicles with an emphasis to apply green solutions. The acoustic solutions proposal in this paper compares and contrasts barrier densities, sealing characteristics between traditional and carbon neutral acoustical barriers. It also compares important material properties. Furthermore, these comparisons demonstrate that vehicular acoustic performance need not be compromised as the industry moves towards more climate friendly initiatives. Lastly, the paper identifies an ideal application for planet friendly, carbon neutral NVH solutions. This is accomplished by using acoustical barrier applications that are production ready and commercially available today. None of these carbon neutral NVH solutions alter the anticipated acoustical performance of the target vehicle in a negative manner.</div></div>
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STOREHEIER, SA, and TE VIGRAN. "ACOUSTIC GROUND IMPEDANCE ASSESSMENT." In Inter-Noise 1996. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/19823.

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SNYDER, SD, SN BURGEMEISTER, and K. BURGEMEISTER. "PERFORMANCE ENHANCEMENT OF STRUCTURAL-ACOUSTIC ACTIVE CONTROL SYSTEMS VIA ACOUSTIC ERROR SIGNAL DECOMPOSITION." In Inter-Noise 1996. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/19825.

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Campbell, Brian, Michael Abrishaman, and Wayne Stokes. "Structural-Acoustic Analysis for the Prediction of Vehicle Body Acoustic Sensitivities." In Noise & Vibration Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/931327.

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Poulos, Athanasios, Jonathan Jacqmot, Romain Baudson, Kambiz Kayvantash, and Sandrine Le Corre. "Acoustic Model Reduction for the Design of Acoustic Treatments." In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-01-1057.

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ALLAWAY, PH. "ACOUSTIC PRIVACY BETWEEN OFFICES." In Noise within Buildings 1989. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/21853.

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MACEY, PC, and DJW HARDIE. "ACOUSTIC ANALYSIS OF AXIALLY PERIODIC STRUCTURES." In Inter-Noise 1996. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/19716.

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MORREY, D., and FR WHEAR. "EXPERIMENTAL ACOUSTIC MODAL ANALYSIS - A REVIEW." In Inter-Noise 1996. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/19342.

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Katsuta, Tomio, Atsuhiro Matsuda, and Seiichi Hamada. "Acoustic Analysis of Truck Cab." In Noise & Vibration Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1991. http://dx.doi.org/10.4271/911075.

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Zigoneanu, Lucian, Bogdan-Ioan Popa, and Steven A. Cummer. "Sound Manipulation With Acoustic Metamaterials." In ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-1277.

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Acoustic metamaterials are engineered materials with properties hard or impossible to find in natural materials (e.g. negative effective density and/or negative bulk modulus). Therefore, a myriad of novel applications could be imagined and some of them have already been theoretically and/or experimentally demonstrated. Gradient index acoustic lenses, acoustic cloaks or acoustic absorbing panels are some common examples. Here, we review the coordinate transformation approach (transformation acoustics) which provides the material parameters needed to precisely control the acoustic wave propagation. Then, we use this technique to design an acoustic black hole and a 3D acoustic ground cloak. We use numerical simulations to explore the practical feasibility of the material parameters required by these applications and design non-resonant, highly sub-wavelength unit cells that will implement them in practice.
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Reports on the topic "Acoustic noise"

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Deryabin, I. V. Noise-absorbing panel with bypass channels. FORGING AND STAMPING PRODUCTION. MATERIAL WORKING BY PRESSURE, August 2023. http://dx.doi.org/10.12731/kshpomd62023-deryabin.

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Noise, having a harmful effect on humans and the environment, forces us to search and conduct research on the development of new methods and means of noise protection. Currently, with an increasing increase in the flow of vehicles in residential areas, with the development of industrial production, the issue of noise control is becoming particularly relevant. A well-known and effective technical solution for blocking the transmission of acoustic energy is the use of noise-absorbing panels, both as part of various soundproof structures, and in the form of separate acoustic elements installed in noisy rooms. The article discusses the design of a noise-absorbing panel containing through bypass channels. Such a panel has a broadband sound absorption effect in frequency composition due to the use of porous sound-absorbing structures of structural materials with the integration of bypass channels into their composition.
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Meyer, Erik. Craters of the Moon National Monument and Preserve: Acoustic monitoring report, 2017. National Park Service, 2024. http://dx.doi.org/10.36967/2303262.

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This study arose from the Craters of the Moon National Monument and Preserve (CRMO) Resource Stewardship Strategy (RSS), which identified the need for baseline acoustic surveys in the park. Short-term natural soundscape RSS goals were to identify the condition of the acoustic resource, and the high priority stewardship activity associated with this goal was to collect baseline acoustic data. Therefore, from June?September 2017, the Natural Sounds and Night Skies Division (NSNSD) gathered acoustical data at six sites in CRMO to provide park managers with information about the acoustical environment, sources of noise, and the natural and existing ambient sound levels within the park. On average, noise was present from 7 to 85 percent of the time across the six sites. The most common sources of noise were vehicles, aircraft, and people. The maximum percent time audible for any detailed noise source was people at site CRMO004, audible for 81% of a 24-hr period. Aircraft was most audible at site CRMO005 (15%), and vehicles were most audible at site CRMO001 (20%). Overall, existing median ambient sound levels (LA50) at sites within CRMO ranged from 17.8?31.1 dB during the day and 15.6?34.0 dB at night during the sampling period. Natural ambient sound levels (LAnat) at sites within CRMO ranged from 16.4?30.0 dB during the day and 15.1?33.0 dB at night. The median impact, defined as the difference in dB between the LA50 and LAnat, was 1.4 dB. Noise impacts ranged from 1.1 dB at CRMO006 to 8.3 dB at CRMO004, where noise was audible for 100% of the time from 07:00 to 10:00.
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Blevins, Matthew, Gregory Lyons, Carl Hart, and Michael White. Optical and acoustical measurement of ballistic noise signatures. Engineer Research and Development Center (U.S.), January 2021. http://dx.doi.org/10.21079/11681/39501.

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Supersonic projectiles in air generate acoustical signatures that are fundamentally related to the projectile’s shape, size, and velocity. These characteristics influence various mechanisms involved in the generation, propagation, decay, and coalescence of acoustic waves. To understand the relationships between projectile shape, size, velocity, and the physical mechanisms involved, an experimental effort captured the acoustic field produced by a range of supersonic projectiles using both conventional pressure sensors and a schlieren imaging system. The results of this ongoing project will elucidate those fundamental mechanisms, enabling more sophisticated tools for detection, classification, localization, and tracking. This paper details the experimental setup, data collection, and preliminary analysis of a series of ballistic projectiles, both idealized and currently in use by the U.S. Military.
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Bond, Z. S., Thomas J. Moore, and Kate McCreight. Acoustic Characteristics of Sentences Produced in Noise. Fort Belvoir, VA: Defense Technical Information Center, September 1989. http://dx.doi.org/10.21236/ada235344.

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5

Buckingham, Michael J. Deep-Water Ambient Noise Profiling; Marine Sediment Acoustics; and Doppler Geo-Acoustic Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada542068.

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Buckingham, Michael J. Deep-Water Ambient Noise Profiling; Marine Sediment Acoustics; and Doppler Geo-Acoustic Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada574805.

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Burnely, V. S., and F. E. Culick. The Influence of Comubstion Noise on Acoustic Instabilities. Fort Belvoir, VA: Defense Technical Information Center, November 1997. http://dx.doi.org/10.21236/ada397935.

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Buck, S., J. Roadman, P. Moriarty, and S. Palo. Acoustic Array Development for Wind Turbine Noise Characterization. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1111205.

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9

Meyer, Erik. Cabrillo National Monument: Acoustic monitoring report, 2021. National Park Service, 2024. http://dx.doi.org/10.36967/2303446.

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This study arose from the Cabrillo National Monument (CABR) Resource Stewardship Strategy (RSS), which identified the need for baseline acoustic surveys in the park. One of the RSS stewardship goals was to minimize anthropogenic sounds outside and inside park boundaries to enhance the visitor experience. A Technical Assistance Request (TAR) for natural sounds inventory was submitted to the Natural Sounds and Night Skies Division. Therefore, in May 2021, the NSNSD gathered acoustic data at two sites in CABR to provide park managers with information about the acoustic environment, sources of noise, and the existing ambient sound levels within the park. On average, noise was present from 95 to 99 percent of the time across the two sites. The most common sources of noise were aircraft, motor sounds, and a foghorn. The maximum percent time audible for any detailed noise source was the foghorn at site CABR001, audible for 95% of a 24-hr period over 10 days of listening. Motor sounds were most audible at site CABR002, audible for 68% of the time. Overall, existing ambient sound levels (LA50) at sites at CABR were 39.5 and 43.1 dB during the day and 34.7 and 42.5 dB at night during the sampling period (CABR001 and CABR002, respectively). Natural ambient sound levels (LAnat) were 30.2 and 38.0 dB during the day and 26.6 and 38.4 dB at night for CABR001 and CABR002 respectively, although these measurements were likely influenced by the high prevalence of noise. As a supplement, a geospatial sound model predicts existing and natural ambient sound levels at CABR are 46.0 (dBA) and 31.4 (dBA), respectively.
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Quatieri, Thomas F., Robert B. Dunn, Robert J. McAulay, and Thomas E. Hanna. Time-Scale Modification of Complex Acoustic Signals in Noise. Fort Belvoir, VA: Defense Technical Information Center, February 1994. http://dx.doi.org/10.21236/ada277535.

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