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Journal articles on the topic 'Acoustic Comfort'
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1
WEN, Xin, Qi MENG, Da YANG, and Mengmeng LI. "Effects of indoor thermal-acoustic interaction on comfort and facial expression." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 7 (October 4, 2024): 4303–11. http://dx.doi.org/10.3397/in_2024_3442.
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While thermal-acoustic interaction is considered that to have an effect on comfort perceptions, the interaction effects of these factors and their impacts on perceived comfort and facial expressions have not been thoroughly investigated. In this study, the interaction effects between temperature and sound pressure levels on thermal, acoustics, overall comfort and facial expressions of young adults in offices were examined. The results showed that: (1) thermal-acoustic interaction and sound pressure levels had a significantly effect on thermal comfort, acoustic comfort and overall comfort; thermal comfort and overall comfort were significantly affected by temperature. (2) thermal-acoustic interaction had a significantly effect on the valence of facial expressions over a period from 20 to 60 seconds. (3) comfort perceptions had significantly correlations with several facial expressions.
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Roskams, Michael, Barry Haynes, Pyoung-Jik Lee, and Sang-Hee Park. "Acoustic comfort in open-plan offices: the role of employee characteristics." Journal of Corporate Real Estate 21, no. 3 (September 9, 2019): 254–70. http://dx.doi.org/10.1108/jcre-02-2019-0011.
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Purpose This paper aims to determine the extent to which employees’ experiences of acoustic comfort, well-being and productivity in open-plan offices are determined by specific characteristics (including demographic information, task characteristics, and personality traits). Design/methodology/approach A questionnaire was distributed to the occupants of three open-plan office sites and was completed by 166 employees in total. Findings The results indicated that acoustic comfort in open-plan offices is largely determined by noise sensitivity. Higher noise sensitivity was associated with more negative ratings of acoustical quality, more perceived disturbance by speech and more difficulties in concentration. More negative experiences were also reported by employees with lower interactivity with colleagues. Practical implications There is significant inter-individual variability in experiences of acoustic comfort, well-being and productivity in open-plan offices. As such, workplace practitioners should consider acoustic and behavioural solutions for introducing a greater diversity of functional workspaces within the office, so that employees can choose the most suitable working area for their requirements. Originality/value Whereas the majority of past acoustics research has been laboratory-based, this study is conducted in real office environments with a representative sample of knowledge workers.
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Amran, M. Mohd, M. Shaiful Rizal, I. Maznan, Mohd Nazrul Roslan, Y. Musli Nizam, Mohd Imran Ghazali, and M. Shahruddin. "Evaluation of Sound Comfort in Examination Hall Using Acoustical Environmental Analyses." Applied Mechanics and Materials 315 (April 2013): 825–29. http://dx.doi.org/10.4028/www.scientific.net/amm.315.825.
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Acoustics environmental analyses were conducted in the unoccupied examination hall at Universiti Tun Hussein Onn Malaysia (UTHM), in order to determine the acoustical environment which reflects to sound comfort during sitting exam. The acoustic parameters that measured are background noise level, sound pressure level and reverberation time. The analysis result of untreated wall condition (without absorbent material) was revealed poor while treated wall condition (with absorbent material) revealed the improvement result. Installation of absorbent material on the wall and speakers rearrangement had reduced the highest background noise level of examination hall average reverberation times. A minor alteration at examination hall had contributed to better acoustic performance.
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CANSU, Nicole, Greta ÖHLUND WISTBACKA, Sofia HOLMQVIST-JäMSéN, Roland RYDELL, Emma ARVIDSSON, and Viveka LYBERG ÅHLANDER. "Acoustic refurbishments in a university lecture room: effects on speaker's comfort and voice use." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 6 (October 4, 2024): 5254–61. http://dx.doi.org/10.3397/in_2024_3566.
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Poor acoustic conditions in learning spaces have a detrimental effect on the speaker´s health and constitutes a risk factor for voice disorders. Previous research indicate that an acoustic refurbishment of the learning space has the potential to increase well-being and decrease voice related health problems among teachers, but the research is scarce. In this study, we aim to investigate how different acoustic conditions affect the speakers voice use and self-perceived speaker's comfort. Voice recordings of short speech-tasks and self-evaluations of speaker's comfort were collected from fifteen participants during a three-step acoustic refurbishment of a real-life university lecture room in an experimental setting. The influence of background babble and a classroom soundfield amplification system on vocal parameters and self-perceived speaker's comfort were also investigated. Factor analysis of the speaker's comfort questionnaire revealed a two-factor solution where factor 1 represented vocal behavior and perception of room acoustics, and factor 2 represented the perception of the task in itself. Sum scores for factors 1 and 2 will be calculated and used in a mixed-effects model investigating the effect of room acoustics on self-perceived speaker's comfort.
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Miqueau, Valentin, Etienne Parizet, and Sylvain Germes. "Psycho-acoustic evaluation of the automotive acoustic comfort using vibro-acoustic prediction methods." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 703–14. http://dx.doi.org/10.3397/in-2021-1630.
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In the automotive industry, the acoustic comfort is considered as a selling point of utmost importance. To help the OEMs improve the acoustic comfort in cars, as a one-tier supplier of automotive glazing, Saint-Gobain is currently working on the acoustic comfort within the cabin in order to propose the right set of glazing consistent with the OEMs' specifications. The characterization of the acoustic comfort mostly relies on physical demonstrators required for carrying out the relevant measurements. It is however not available early in the project phase, delaying the subjective analysis late in the development phase. To have the opportunity to develop effective solutions, the acoustic comfort has to be investigated as early as possible in the design process. Saint-Gobain is thus currently developing relevant acoustic models in order to predict the mid-high frequency airborne interior noise generated by the wind excitations. The subjective acoustic comfort has then to be assessed using the predicted interior sound pressure levels converted into audio soundtracks for the auralization purposes. In this paper, we briefly present the Statistical Energy Analysis model developed by Saint-Gobain. The psychoacoustic methodology deployed to evaluate its reliability for the subjective evaluation of the automotive acoustic comfort is detailed.
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Andargie, Maedot S., Marianne Touchie, and William O'Brien. "Subjective and objective evaluation of the impact and airborne sound insulation of multi-unit residential buildings." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 778–86. http://dx.doi.org/10.3397/in-2021-1648.
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Multi-unit residential building (MURB) occupants often express dissatisfaction with their suites' acoustic conditions despite existing building acoustic standards and regulations as well as growing research on noise control and building acoustics. Reasons for this include the lack of proper characterization of acoustic comfort in MURBs and lack of comprehensive and stringent regulations. To better understand factors that impact acoustic comfort and explore strategies to improve the acoustic performance of MURBs, investigations of acoustic conditions were carried out. This work presents the results of the investigations which include subjective and objective evaluations of acoustic conditions in two MURBs. Impact sound insulation measurements using both a tapping machine and a rubber ball as well as 24-hour indoor noise monitoring were carried out in unoccupied suites. An online survey was then used to collect subjective assessments of the noise conditions in the buildings and the effects on occupants' comfort post occupancy. Results of the data analysis suggest that occupants are more sensitive to low-frequency impact sounds than mid- and high-frequency impact noise.
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Wu, Yue, Qi Meng, Lei Li, and Jingyi Mu. "Interaction between Sound and Thermal Influences on Patient Comfort in the Hospitals of China’s Northern Heating Region." Applied Sciences 9, no. 24 (December 17, 2019): 5551. http://dx.doi.org/10.3390/app9245551.
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Previous studies have found that hospitals are often inadequately ventilated in the heating region of China, which causes an increased risk of negative impacts on patients. The complex interaction between thermal comfort and acoustics presents considerable challenges for designers. There is a wide range of literature covering the area of the interaction between the sound–thermal, sound–odor, and acoustic–visual influences, but a focused research on the sound –thermal influence on comfort in hospitals has not been published yet. This paper describes a series of field measurements and subjective evaluations that investigate the thermal comfort and acoustic performance of eighteen hospitals in China. The results showed that the thermal comfort in the monitored wards was mostly acceptable, but the temperatures tended to be much higher and the humidity much lower, in practice than they were designed to be in the heating season. The most significant conclusion is that a positive thermal stimulus can create a comfortable thermal environment, which can improve patients’ evaluation of the acoustics, while a negative stimulus has the opposite effect. A comfortable acoustic environment also caused patients to positively evaluate thermal comfort. Moreover, the relationship between thermal and sound effects in the overall evaluation showed that they are almost equal.
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Glean, Aldo A., Stanley D. Gatland, and Ihab Elzeyadi. "Visualization of Acoustic Comfort in an Open-Plan, High-Performance Glass Building." Buildings 12, no. 3 (March 11, 2022): 338. http://dx.doi.org/10.3390/buildings12030338.
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The aesthetic and functional appeal of high-performance, open-plan office buildings presents special challenges. Extensive use of glass at the building’s perimeter to improve visual comfort and office communication can negatively impact acoustic comfort without proper design considerations. This study investigates the utility of a novel visualization approach to documenting the interactional impact of acoustical comfort on the health and well-being of occupants in an open-office environment. Room acoustic measurements of background noise and speech transmission index were conducted and distraction distances were calculated and visualized using a mapping technique. In addition, a comprehensive pre- and post-occupancy evaluation protocol was employed. The paper illustrates the reliability of the visualization approach to aid in the interpretation and comparison of various open-office acoustic solutions from a human-centric acoustic environment perspective.
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Ayinla, Abdulrasaq Kunle, Glory Ndifrekeabasi Ekpo, Ilelabayo Ismail Adebisi, and Olusola Oladapo Makinde. "Correlates of Acoustic and Visual Comforts in Selected Lecture Theaters in Ladoke Akintola University of Technology, Ogbomoso, Nigeria." International Research Journal of Natural Sciences 11, no. 1 (January 15, 2023): 13–23. http://dx.doi.org/10.37745/irjns.13/vol11n11323.
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The challenge of having good acoustics and visual comfort in lecture theatres was explored in the study. The aim was to evaluate the visual and acoustic comfort levels of users in lecture theatres with a view to establishing their significance in future designs. The study selected seven (7) lecture theatres representing 58.33% out of a total of 12 in Ladoke Akintola University of Technology Ogbomoso as the sample size using simple random sampling techniques. Capacity of each lecture theatres were determined and questionnaires were randomly administered on 4% of the total Users in each. The questionnaire was to determine the hearing audibility levels, visual clarity levels and general comfort/satisfaction levels of users at periods they were receiving lectures. A total of 248 questionnaires were administered. Sources of noise in the lecture theatres were also determined through questionnaire administration. Data were descriptively and inferentially analysed. The study found furniture movements as the major source of noise in the lecture theaters studied. Also, it was realized that there was a significant correlation between users’ satisfaction levels and each of visual clarity and hearing audibility (acoustic comfort) despite that users indicated that it was possible for them to hear speaker’s speeches without seeing the board; It was hence suggested that determinant factors of these two criteria such as shape of buildings, sizes/volume and sources of noise should be critically put into consideration at design inception stages. Other recommendations that could foster appropriate synergy between acoustic and visual comforts in Lecture Theatres were given.
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Jalil, Nurul Amira Abd, Nazli Bin Che Din, and Nila Inangda Manyam Keumala Daud. "A Literature Analysis on Acoustical Environment in Green Building Design Strategies." Applied Mechanics and Materials 471 (December 2013): 138–42. http://dx.doi.org/10.4028/www.scientific.net/amm.471.138.
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Acoustic quality is important in ensuring a healthy and workable working environment. One of green buildings main objective is to reduce the building impact on human health and performance. This was emphasized in most green building rating system under its requirement for Indoor Environmental Quality (IEQ). IEQ highlights the four main points for achieving an improved indoor environment: indoor air quality, acoustics, visual comfort (lighting) and thermal comfort. Although acoustics was mentioned in the IEQ criteria, according to previous surveys and studies; acoustics quality in green buildings were not improving. It seems as though in order to improve on other green building criteria, acoustics performance is bound to become poorer. Through review of previous literature, survey and studies on acoustical performance in green buildings, the objective of this paper is to identify how green building design strategies contribute to the degradation of acoustical environment in green office buildings. Findings shows that design strategies implemented to cater for other green building requirements such as natural ventilation, daylight, reduction of finishes and office layout have unintentionally decrease the acoustical quality.
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Arab, Yasser, Siti Sarzali, Maryam Saeed, and Ahmad Hassan. "Rethinking soundscape planning for an amphitheater in rainforest setting." Al-Qadisiyah Journal for Engineering Sciences 17, no. 2 (June 30, 2024): 148–57. http://dx.doi.org/10.30772/qjes.2024.147843.1162.
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The quality of the acoustic environment plays a crucial role in shaping human communication and comfort within a space. This is particularly true for outdoor performance venues like amphitheatres. This study explores the potential of soundscape design to optimize acoustic comfort for audiences in the unique setting of a rainforest amphitheater. Rainforests, characterized by dense vegetation and uneven terrain, present both challenges and opportunities for acoustic design. While they may introduce unwanted background noise, the inherent properties of rainforest trees offer valuable potential for passive noise absorption. This research investigates how existing trees can be strategically integrated into the amphitheater design to utilize their natural sound-absorbing capabilities. The primary objective is to achieve a balanced soundscape that maximizes visitor comfort during performances. Initial findings suggest that strategically utilizing trees as noise buffers while preserving natural soundscape elements can be a viable approach. Furthermore, creating a diversity of dynamic sonic areas within the amphitheater appears promising in catering to individual preferences and enhancing overall acoustic comfort for the community. Ultimately, this study seeks a harmonious solution that optimizes performance acoustics for visitors while preserving the unique soundscape of the rainforest environment.
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Bukovics, Jürgen, Encarna Cabes Roca, Wolfram Gerschütz, Heiko Kolm, and Adalbert Schneider. "Acoustic and Vibrational Comfort Configuration." ATZextra worldwide 13, no. 2 (June 2008): 100–107. http://dx.doi.org/10.1365/s40111-008-0066-x.
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Wiratha, Made Samantha, and Lucky Tsaih. "Acoustic comfort in living environment." Journal of the Acoustical Society of America 138, no. 3 (September 2015): 1900. http://dx.doi.org/10.1121/1.4933970.
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Meng, Qi, Peng Luo, Yan Ru Li, and Jian Chun Guo. "The Influence of Users' Behavioral Characteristics on Soundscape in the Waiting Halls of Railway Stations." Advanced Materials Research 518-523 (May 2012): 3830–33. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.3830.
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It has been demonstrated in previous studies that the evaluation of soundscape was influenced by not only social characteristics but also some behavioral characteristics of persons. In this study, more than 600 questionnaire survey has been undertaken at waiting halls of 4 railway stations in capital cities of China, to determine how the users’ behavioral characteristics influence their evaluation of soundscape. The results show that the relationships between evaluation of acoustics and passengers’ waiting time, rest or partners is not significant (p>0.1), but visiting times (p<0.01). The evaluation of subjective loudness is the highest, when waiting time at 1.5 to 2 hours, while evaluation of subjective loudness is general lower at other time. The evaluation of acoustic comfort is more different between sitting and standing, when waiting time at 0.5 to 1 hour. The passengers with no partner will give general higher acoustic comfort at first (<0.5 hours), but give lower acoustic comfort at following time.
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Le-Muet, Yoan, Patrick Chevret, Thomas Bonzom, and Laurent Brocolini. "Outlook for the ISO 22955: Acoustic quality of open plan offices." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 5 (February 1, 2023): 2633–42. http://dx.doi.org/10.3397/in_2022_0369.
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The ISO 22955 standard " Acoustic quality of open plan offices " was published in may 2021. It aims to provide principles, descriptors, and measurement methods to characterize acoustics, which are easy to use and correspond to the perception of the acoustical environment by the occupants of the spaces. The scope of the standard is the acoustics of open-plan offices and, more specifically, cognitive effects of noise, i.e. acoustic comfort and noise disturbance in association with the activity. After more than a year of use of the standard, this document proposes to take stock of it and to identify potential paths of reflection for a possible future revision. Among the points of discussion considered, are the consequences of the evolution of office work, activities and concepts in the tertiary sector (flex office, co-working, teleworking, etc.), and their implication on acoustic quality. Another fundamental matter is the relevance of the indicators used in the standard and the associated required values.
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Kanka, Simon, Luca Fredianelli, Francesco Artuso, Francesco Fidecaro, and Gaetano Licitra. "Evaluation of Acoustic Comfort and Sound Energy Transmission in a Yacht." Energies 16, no. 2 (January 10, 2023): 808. http://dx.doi.org/10.3390/en16020808.
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After being neglected for a long time, in the last years, ships have been recognized and studied as sound emitters. The sound energy they generate impacts the outside, but it can also affect the indoor quality of life if the environments are not properly designed. In fact, acoustic comfort plays a pivotal role, particularly in recreational crafts. In the present work, room acoustics and acoustic camera measurements were performed, inside a 50 m length overall yacht, chosen as a case study in order to evaluate the acoustic comfort. The Italian classification procedure UNI 11367:2010 for buildings was applied, and results have been compared to other international comfort classes. However, all of these are based on prescription for standard buildings, and the present work highlights that they do not account for the effective ship’s acoustic issues: sound energy transfer from impacts over ceilings and sound energy leakage. While attention of shipbuilders in acoustic comfort is shown in the measured good reverberation times, the acoustic camera revealed sound energy leakages corresponding to hidden escape ways that have been poorly insulated. This compromises the standardized sound difference between contiguous compartments and also the thermal insulation, as leakage involves air passages. The present work attempts to evolve the classification procedure by also including, for the first time, the reverberation time, but future studies focused on finding correct standardized impact level noise for ship cases are needed. In fact, their values were very high and not comparable with those measured in actual buildings and for which reference values have been designed.
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Rockstroh, Kurt, David Sykes, and Mandy Kachur. "Acoustic comfort in health care facilities: Perspective of FGI-Facility Guidelines Institute." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A70—A71. http://dx.doi.org/10.1121/10.0010689.
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Acoustic comfort is a welcome concept for the design and management of healthcare facilities, potentially providing methods to address acoustic environment deficiencies revealed by experience and by the Affordable Care Act’s CAHPS® Hospital Survey, on which the noise question historically performs worst yielding public disclosure and financial penalties to hospitals. One possible vehicle for introducing quantified acoustic comfort into buildings is the healthcare design guidelines published by the Facility Guidelines Institute (FGI), which are adopted as building code in a majority of the United States, provide reference standards for the Leadership in Energy and Environmental Design (LEED) Rating System and the International Green Construction Code, and are cited in 87 countries. For acceptance into the FGI guidelines, “acoustic comfort” requires a formal definition accepted by standards organizations and clinical research, which is free from conflicts of interest based on research conducted by recognized third-party organizations on the physiological and psychological effects of noise on humans, particularly those with compromised health, like patients in hospitals and skilled nursing facilities. FGI encourages proposals from the public, particularly valuing advice from members of professional societies, and relies on the research community to provide evidence-based support for all acoustics topics.
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Herranz-Pascual, Karmele, Ioseba Iraurgi, Itziar Aspuru, Igone Garcia-Pérez, José Luis Eguiguren, and Álvaro Santander. "Development of the Acoustic Comfort Assessment Scale (ACAS-12): Psychometric properties, validity evidence and back-translation between Spanish and English." PLOS ONE 18, no. 2 (February 7, 2023): e0281534. http://dx.doi.org/10.1371/journal.pone.0281534.
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A methodological proposal of a scale for human perception assessment of acoustic environment (acoustic comfort) in urban public spaces is presented: Acoustic Comfort Assessment Scale (ACAS 12). This paper shows the process of constructing this scale and its psychometric properties and validation. The approach is based on the soundscape conceptualisation collected in ISO 12913–1:2014 (Acoustics—Soundscape: Definition and conceptual framework). The proposed scale is a 5-point semantic differential scale made up of twelve pairs of bipolar adjectives, grouped around five theoretical dimensions. It is based on previous versions of 2-point and 3-point scales. The ACAS-12 scale is the result of several empirical studies carried out by the authors on environmental and acoustic comfort assessment, beginning in 2011 in some cities of the Basque Country (Spain). Selected urban open places cover a wide variability of acoustic and non-acoustic characteristics, as well as the type of participants (real users) and activities carried out in these places. The original language of this scale is Spanish. The back-translation technique has been applied to create the English version. The results highlight the good psychometric properties of the ACAS 12 scale (Cronbach’s alpha 0.91 and composite reliability 0.90) and indicate that the best factorial solution is that of a single factor composed of the 12 pairs of adjectives that would explain approximately 50% of the ACAS-12 variance (44% of extracted variance by Raykov’s method or 56% by the MAP test). The absolute and incremental fit indices were above the minimum reference value of 0.90 and the residual-based indices showed values close to suitability (SRMR = 0.057; RMSEA = 0.042). This result supports the consideration of the ACAS-12 scale as a general measure of acoustic comfort.
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Wen, Xin, Qi Meng, Da Yang, and Mengmeng Li. "Effects of thermal-acoustic interaction on comfort under office behaviors - taking air-conditioning noise as an example." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 8 (November 30, 2023): 241–52. http://dx.doi.org/10.3397/in_2023_0052.
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Thermal-acoustic interaction holds significant importance in the development of subjective perception prediction models. While previous studies on this topic mainly focused on perceptual changes, the differences related to various office behaviors were not fully considered. This study aims to investigate the effects of thermal-acoustic interaction on comfort during different office behaviors (such as rest, reading, writing, and typing) using air-conditioning noise as an example in a laboratory setting. The results, obtained within the near thermal comfort zone, demonstrate that: (1) thermal sensation was significantly affected by temperature across all four office behaviors, but thermal comfort was not significantly affected; (2) subjective loudness and acoustic comfort were influenced by temperature during reading, with the lowest scores observed at 23; (3) sound pressure level significantly affected overall comfort and overall annoyance across all office behaviors, while temperature influenced overall comfort during reading and writing. These findings underscore the importance of effective thermal-acoustic environment adjustments and the establishment of more accurate and quantitative models for predicting subjective perception. Keywords: Thermal-acoustic interaction, Office behaviors, Comfort, Air-conditioning noise
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Li, Shumin, Yijing Zhang, Qiqi Zhang, Pingting Xue, Hao Wu, Wenjian Xu, Jing Ye, Lingyan Chen, Tianyou He, and Yushan Zheng. "Exploring the Multi-Sensory Coupling Relationship of Open Space on a Winter Campus." Forests 15, no. 5 (May 17, 2024): 876. http://dx.doi.org/10.3390/f15050876.
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Exploring the combined effects of multisensory interactions in open spaces can help improve the comfort of campus environments. Nine typical spaces on a university campus in Fuzhou were selected for this study. Subjects perceived the environment and then completed an on-site subjective questionnaire. At the same time, meteorological data (global radiation, air temperature, globe temperature, wind speed, relative humidity, and illumination intensity) were measured to determine the interactions between visual and acoustic and thermal perceptions. Differences in the meteorological parameters between the measuring points were described using a one-way ANOVA and Tukey’s post hoc test, and a chi-square test of independence was used to determine significant associations between thermal, acoustic, and visual comfort, which in turn led to the study of interactions between visual, acoustic, and thermal comfort using a two-way ANOVA. The following conclusions were drawn: (1) the Thermal Comfort Vote (TCV) increased with the increasing Acoustic Comfort Vote (ACV) at all levels of thermal stress. (2) The highest and lowest Acoustic Sensation Vote (ASV) values for each sound type were derived from either “slightly cold” or “warm” conditions. Both the Thermal Comfort Vote (TCV) and the Acoustic Comfort Vote (ACV) were positively correlated. (3) When “neutral”, the Thermal Sensation Vote (TSV) increased with increasing illumination intensity (LUX). (4) The Sunlight Sensation Vote (SSV) increased with the increasing Universal Thermal Climate Index (UTCI) when illumination intensity (LUX) was moderate and bright. (5) The highest and lowest Acoustic Sensation Vote (ASV) values for each sound type came from either “slightly cold” or “warm” conditions.
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Abhaya Kumar Baliarsingh and Jyoti Ranjan Paikaray. "Acoustic Materials in Automobiles." international journal of engineering technology and management sciences 8, no. 1 (2024): 324–30. http://dx.doi.org/10.46647/ijetms.2024.v08i01.042.
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Automobile comfort and design has had an important impact on the world wide economy during the past century and millions of additional vehicles have been sold because of it. Much research work is being done on automobile interior design in comparison to other industrial designs. However, sound level inside the cabins affects the journey of millions of passengers to a great degree and comfort than many other subjects. Low noise level in the cabins is a comfort parameter of high importance. Therefore an attempt has been made in this paper to review the different acoustic materials being used in various automobiles and also their properties which have impact on noise reduction
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Taghipour, Armin, Tessa Sievers, and Kurt Eggenschwiler. "Acoustic Comfort in Virtual Inner Yards with Various Building Facades." International Journal of Environmental Research and Public Health 16, no. 2 (January 16, 2019): 249. http://dx.doi.org/10.3390/ijerph16020249.
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Housing complex residents in urban areas are not only confronted with typical noise sources, but also everyday life sounds, e.g., in the yards. Therefore, they might benefit from the increasing interest in soundscape design and acoustic comfort improvement. Three laboratory experiments (with repeated-measures complete block designs) are reported here, in which effects of several variables on short-term acoustic comfort were investigated. A virtual reference inner yard in the ODEON software environment was systematically modified by absorbers on building facades, whereby single-channel recordings were spatialized for a 2D playback in laboratory. Facade absorption was found, generally, to increase acoustic comfort. Too much absorption, however, was not found to be helpful. In the absence of any absorbers on the facade, absorbing balcony ceilings tended to improve acoustic comfort, however, non-significantly. Pleasant and unpleasant sounds were associated with comfort and discomfort, accordingly. This should encourage architects and acousticians to create comfortable inner yard sound environments, where pleasant and unpleasant sound occurrence probabilities are designed to be high and low, respectively. Furthermore, significant differences were observed between acoustic comfort at distinct observer positions, which could be exploited when designing inner yards.
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Luzzi, Sergio, Chiara Bartalucci, and Paola Pulella. "THE DESIGN OF ACOUSTIC AND GLOBAL COMFORT IN RESTAURANTS: THE CASE STUDY OF FRATELLI BRIGANTI´S RESTAURANT." VOLUME 39, VOLUME 39 (2021): 119. http://dx.doi.org/10.36336/akustika202139119.
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Acoustic quality and, in wider terms, global comfort are crucial aspects for the design of built environments. There are objective and subjective parameters, from different disciplines, which may be used for contributing to the definition of global comfort. Concerning restaurants, dining out represents an opportunity for spending quality time in good company; therefore, a multidisciplinary approach is required to the designer in order to create a unique experience for all senses. In this paper, factors involved in the assessment of the global comfort are presented. Vie en.ro.se Ingegneria has worked for the improvement of global comfort in many restaurants, such as Fratelli Briganti’s Restaurant. The project was designed and defined starting from the observations collected through a Customer Satisfaction questionnaire, together with the results of acoustics and lighting measurements carried out on site. According to the outcomes, the intervention has interested different disciplines: acoustics, lighting engineering, and thermo engineering. At the end of the renovation, the Fratelli Briganti’s Restaurant has been reopened and the same Customer Satisfaction questionnaire has been distributed. The outcomes show a general improvement of the comfort conditions.
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Viveiros, Elvira. "Is acoustic comfort underestimated by architects?" Journal of the Acoustical Society of America 128, no. 4 (October 2010): 2342. http://dx.doi.org/10.1121/1.3508293.
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Van Damme, M., M. Blasco, C. Crispin, P. Huart, B. Ingelaere, and D. Wuyts. "Acoustic Comfort in Timber Frame Dwellings." Building Acoustics 14, no. 1 (January 2007): 15–24. http://dx.doi.org/10.1260/135101007780661392.
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Della Crociata, Sabrina, Antonio Simone, and Francesco Martellotta. "Acoustic comfort evaluation for hypermarket workers." Building and Environment 59 (January 2013): 369–78. http://dx.doi.org/10.1016/j.buildenv.2012.09.002.
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Wu, Yue, Jian Kang, Wenzhong Zheng, and Yongxiang Wu. "Acoustic comfort in large railway stations." Applied Acoustics 160 (March 2020): 107137. http://dx.doi.org/10.1016/j.apacoust.2019.107137.
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Chen, Xi, and Jian Kang. "Acoustic comfort in large dining spaces." Applied Acoustics 115 (January 2017): 166–72. http://dx.doi.org/10.1016/j.apacoust.2016.08.030.
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Melnyk, Illia, Yevhen Fridlib, Artem Maksymenko, and Hanna Kliushnichenko. "Acoustic comfort at Kyiv metro stations." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 5 (February 1, 2023): 2650–61. http://dx.doi.org/10.3397/in_2022_0371.
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Kyiv Metro was opened in 1960 and became the first metro system in Ukraine. From then until the beginning of the 21st century it was developing without considering the acoustic comfort of its passengers and employees. Increased levels of noise and vibration in public transport are mostly ignored, although they are certainly recognized as the reasons for increasing the harmfulness of work for metro employees. The present report analyzes noise levels at metro stations depending on their design features. There are several main types of stations in the Kyiv metro: deep-lying, shallow-lying, as well as above-ground stations. For all types of underground stations, there are options both with and without sound-absorbing finishes. Also, during the construction of the newest stations of the Kyiv metro, vibration isolation systems were used for the construction of the permanent way were used. Within this study, sound pressure levels were measured on the platform at stations of various types. These measurements made it possible to establish a significant influence of the shape of the station vestibule, the presence of sound-absorbing finishes in it, as well as the vibration isolation of the permanent way, on the objective and subjective parameters of acoustic comfort for passengers and employees of the subway.
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Nowicka, Elzbieta. "Improving Engineering Design Using Smart Evaluation of Indoor Acoustical Climate of Dining Places." Applied Sciences 15, no. 5 (March 3, 2025): 2700. https://doi.org/10.3390/app15052700.
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The indoor acoustic climate of dining places often presents challenges for designers and their projects. In this type of enclosure, one of the fundamental factors determining the acoustic climate of a space is the acceptable speech reception in relation to sound alarm systems. This study discusses an index-based method for assessing the acoustic climate of dining places, such as restaurants and cafeterias, during the design process. These studies focused on the reverberation time and speech intelligibility as key parameters defining the acoustical climate. The analyses considered dining places (primarily restaurants) with different dimensions, geometries, and layouts. The method combines architectural parameters (such as volume or shape) and acoustical parameters (such as absorption or background sound) that influence the acoustical quality of dining places. The proposed method is assumed to provide a convenient evaluation of planned dining locations in terms of speech intelligibility. The method is based on the WR index parameter and serves as a functional tool for architects and designers in their initial drawings and when making design decisions. The method was verified using subjective assessments. Implementing this method provides possibilities to increase the comfort of restaurants and cafeterias and lower or avoid costs associated with improving the acoustic comfort of ready-to-use dining places.
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Ren, Xinxin, Qi Li, Qiran Wang, Minmin Yuan, and Shegang Shao. "How streetscape affects subjective responses regarding acoustic comfort: an empirical study based on pedestrian environments with traffic noise." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 1 (November 30, 2023): 7413–24. http://dx.doi.org/10.3397/in_2023_1130.
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How streetscape affects subjective responses regarding acoustic comfort of pedestrian streets in traffic noise environments were examined through an experimental study that considered a multifunctional audio-visual environment with no/low, medium, and high street greenery, dominated by road traffic sound. The results showed that the differences in the acoustic comfort evaluations without and with medium or high greenery were statistically significant. The differences in the acoustic comfort evaluations among streetscapes with different environmental functions were also statistically significant. However, sound levels were the most significant factor affecting acoustic comfort when road traffic at 50-70 dBA was predominantly heard, to a lesser extent, the visible street greenery and environmental functions. Based on the negative linear relationships between sound levels and acoustic comfort evaluations for no/low, medium, and high greenery conditions, the evaluations affected by greenery increased with the increase in road traffic sound levels in transportation environments with accessing and transportation transfer functions, whereas those influenced by either high or medium greenery in leisure environments with resting and catering functions tended to decrease gradually.
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Kazimierska-Grębosz, Marianna, and Joanna Kopania. "Influence of acoustic screens on acoustical comfort of agglomeration inhabitants." Mechanik, no. 7 (July 2015): 561/409–561/416. http://dx.doi.org/10.17814/mechanik.2015.7.255.
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Chen, Huiying, Bo Hong, Hongyun Qu, Yubo Geng, and Meifang Su. "Effects of Acoustic Perception on Outdoor Thermal Comfort in Campus Open Spaces in China’s Cold Region." Buildings 12, no. 10 (September 23, 2022): 1518. http://dx.doi.org/10.3390/buildings12101518.
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To explore the effects of acoustic perception on outdoor thermal comfort, acoustic perception in five typical open spaces in a campus in China’s cold region with common soundscapes was evaluated by using meteorological measures, sound level devices, and a questionnaire survey. Eight adjectives were used to evaluate an individual’s acoustic perception, and the physiological equivalent temperature (PET) was selected as a thermal index. The correlations between acoustic perception and thermal comfort in these typical open spaces were further analyzed. We demonstrated that: (1) Acoustic sensation and comfort varied significantly among sound types (STPs). Respondents reported pleasant perceptions of broadcasting music, running water and birdsong, and wind (a gentle breeze) and insects. (2) Although there was no significant difference in the thermal sensation vote (TSV), we found large differences in the thermal comfort vote (TCV) among STPs. (3) The respondents’ neutral PET (NPET) varied among STPs. In autumn, the ranked order of NPET was machines > running water and birdsong > crowds > broadcasting music > wind (a gentle breeze) and insects. In winter, the order of the NPET was machines > wind (a gentle breeze) and insects > crowds > broadcasting music > running water and birdsong. (4) When people perceived “acoustic comfort”, their TSV improved, and vice versa.
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Zhou, Shu Wen, and Si Qi Zhang. "Structural-Acoustic Analysis of Automobile Passenger Compartment." Applied Mechanics and Materials 236-237 (November 2012): 175–79. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.175.
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Besides the performances of handling, stability, ride comfort, power and fuel economy, the sound pressure levels in the automobile passenger compartments heavily influence the customer’s purchasing decision. The interior acoustics of automobile passenger compartment was analyzed in this paper. The frequency response analysis was performed on the vehicle body due to road roughness. The frequency response of vehicle body’s output spectrum, nodes’ velocity is used as the boundary condition of the acoustic cavity. With boundary element method and acoustic transfer vector method, the panel acoustic contribution was analyzed. By modifying the stiffness, damping or mass of the corresponding panel, the acoustic pressure levels at the driver’s and passenger’s ear were decreased.
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Zarei, Farzaneh, Mazdak Nik-Bakht, Joonhee Lee, and Farideh Zarei. "Urban-Scale Acoustic Comfort Map: Fusion of Social Inputs, Noise Levels, and Citizen Comfort in Open GIS." Processes 12, no. 12 (December 13, 2024): 2864. https://doi.org/10.3390/pr12122864.
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With advancements in the Internet of Things (IoT), diverse and high-resolution data sources, such as environmental sensors and user-generated inputs from mobile devices, have become available to model and estimate citizens’ acoustic comfort in urban environments. These IoT-enabled data sources offer scalable insights in real time into both objective parameters (e.g., noise levels and environmental conditions) and subjective perceptions (e.g., personal comfort and soundscape experiences), which were previously challenging to capture comprehensively by using traditional methods. Despite this, there remains a lack of a clear framework explicitly presenting the role of these diverse inputs in determining acoustic comfort. This paper contributes by (1) exploring the relationship between attributes governing the physical aspect of the built environment (sensory data) and the end-users’ characteristics/inputs/sensations (such as their acoustic comfort level) and how these attributes can correlate/connect; (2) developing a CityGML-based framework that leverages semantic 3D city models to integrate and represent both objective sensory data and subjective social inputs, enhancing data-driven decision making at the city level; and (3) introducing a novel approach to crowdsourcing citizen inputs to assess perceived acoustic comfort indicators, which inform predictive modeling efforts. Our solution is based on CityGML’s capacity to store and explain 3D city-related shapes with their semantic characteristics, which are essential for city-level operations such as spatial data mining and thematic queries. To do so, a crowdsourcing method was used, and 20 perceptive indicators were identified from the existing literature to evaluate people’s perceived acoustic attributes and types of sound sources and their relations to the perceived soundscape comfort. Three regression models—K-Nearest Neighbor (KNN), Support Vector Regression (SVR), and XGBoost—were trained on the collected data to predict acoustic comfort at bus stops in Montréal based on physical and psychological attributes of travellers. In the best-performing scenario, which incorporated psychological attributes and measured noise levels, the models achieved a normalized mean squared error (NMSE) as low as 0.0181, a mean absolute error (MAE) of 0.0890, and a root mean square error (RMSE) of 0.1349. These findings highlight the effectiveness of integrating subjective and objective data sources to accurately predict acoustic comfort in urban environments.
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CHRISTENSSON, Jonas. "SS 25268:2023, an acoustic standard for listeners and speakers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 8 (October 4, 2024): 3091–98. http://dx.doi.org/10.3397/in_2024_3273.
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The sound environment in many classrooms is not good, and we know that poor room acoustics impedes learning and has a negative effect on teachers' voice health. Sound reflections in the room have a great impact on both speech intelligibility and speech comfort. SS 25268 is a Swedish sound standard for, among others, school buildings. The standard uses reverberation time, RT, to put requirement on room acoustics. There is a connection between the amount of sound absorption in the room and RT according to Sabine formula. The problem is that Sabine formula requires a diffuse sound field witch very seldom occurs in classrooms with acoustic ceilings. Another problem is when RT is evaluated with T20, the early reflections are not included, and early reflections have a great impact on speech intelligibility. The standard have been updated to a new version, SS 25268:2023. In this standard there is an opportunity for landlords to put other requirements then RT to evaluate the room acoustics. The standard have an appendix to help landlords, principals and teachers to better understand how to put the right acoustic requirements on their school buildings to create both good speech intelligibility and speech comfort.
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Mann, Martin J., Samuel H. Underwood, and Lily M. Wang. "Extracting and classifying psychoacoustic features from online restaurant reviews." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A282. http://dx.doi.org/10.1121/10.0027511.
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Recent work has shown that poor acoustic conditions persist in many restaurants. Owners who receive negative reviews of their establishment's soundscape may struggle to interpret the subjective customer responses into actionable corrective measures. Therefore, further work is needed to taxonomize the acoustically relevant keywords and phrases that occur in user reviews. In this study, an open-source database of restaurant, bar, and coffee shop reviews from across the United States has been obtained. Sentiment analysis and keyword count are used to extract positive, negative, and neutral subjective reviews and subjective features related to acoustics. The resulting subjective features are then categorized, weighed, and linked to objective acoustic parameters using machine learning techniques. Results from this study suggest that owners and consultants may be able to utilize online customer reviews to monitor acoustical comfort and ascertain the nature of an acoustical problem, not only in restaurants, but in any business sector where customers submit online user reviews.
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Bonet-Solà, Daniel, Ester Vidaña-Vila, and Rosa Ma Alsina-Pagès. "Acoustic Comfort Prediction: Integrating Sound Event Detection and Noise Levels from a Wireless Acoustic Sensor Network." Sensors 24, no. 13 (July 7, 2024): 4400. http://dx.doi.org/10.3390/s24134400.
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There is an increasing interest in accurately evaluating urban soundscapes to reflect citizens’ subjective perceptions of acoustic comfort. Various indices have been proposed in the literature to achieve this purpose. However, many of these methods necessitate specialized equipment or extensive data collection. This study introduces an enhanced predictor for dwelling acoustic comfort, utilizing cost-effective data consisting of a 30-s audio clip and location information. The proposed predictor incorporates two rating systems: a binary evaluation and an acoustic comfort index called ACI. The training and evaluation data are obtained from the “Sons al Balcó” citizen science project. To characterize the sound events, gammatone cepstral coefficients are used for automatic sound event detection with a convolutional neural network. To enhance the predictor’s performance, this study proposes incorporating objective noise levels from public IoT-based wireless acoustic sensor networks, particularly in densely populated areas like Barcelona. The results indicate that adding noise levels from a public network successfully enhances the accuracy of the acoustic comfort prediction for both rating systems, reaching up to 85% accuracy.
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Lau, Kevin Ka-Lun, and Chun Yin Choi. "The influence of perceived environmental quality on thermal comfort in an outdoor urban environment during hot summer." Journal of Physics: Conference Series 2042, no. 1 (November 1, 2021): 012047. http://dx.doi.org/10.1088/1742-6596/2042/1/012047.
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Abstract Thermal comfort in outdoor spaces is essential for human health and human wellbeing. A comfortable outdoor space enhances urban livability and sustainability. Previous studies on outdoor human thermal comfort highlighted that apart from the microclimate conditions, the psychological and physiological factors play an important role in human thermal comfort. The influence of environmental quality on human thermal comfort is being examined in this paper. A survey with a total of 1842 thermal comfort responses was conducted during a hot summer in Hong Kong. Perceived aesthetic and acoustic quality votes are strongly associated with Thermal Sensation Votes (TSV). Thermal Comfort Votes (TCV) in the satisfied aesthetic group and the satisfied acoustic group are significantly higher than that in the not satisfied group. A sensation of comfort was confirmed by 39.8% and 38.4% of participants in the satisfied aesthetic group and the satisfied acoustic group, while only 22.2% and 23.9% of the members of the not satisfied group felt comfortable. The study suggested that the perceived environmental qualities are highly associated with thermal sensation and thermal comfort, and a beautiful and quiet environment can improve the thermal comfort and thermal tolerance.
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Montazerolhodjah, Mahdi, Mojtaba Sharifnejad, and MohammadReza Montazerolhodjah. "Soundscape preferences of tourists in historical urban open spaces." International Journal of Tourism Cities 5, no. 3 (November 29, 2019): 465–81. http://dx.doi.org/10.1108/ijtc-08-2018-0065.
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Purpose Considering that the historic city of Yazd was registered as a UNESCO World Heritage Site, and given the necessity of improving the environmental qualities due to the increased number of domestic and foreign tourists, the concept of acoustic comfort seems to be of considerable importance. In this regard, the purpose of this paper is to identify and evaluate the role of sound space components affecting acoustic comfort in the historic urban spaces of the City of Yazd and its two historic squares named Khan Square and Fahadan Square. Design/methodology/approach Accordingly, a total of 632 foreign tourists visiting these squares were asked to enumerate different sounds they could hear in the square and identify their relation with acoustic comfort. In terms of the objectives, this is an applied research using survey and correlation methods. In addition, ANOVA and multiple regression analysis were used to analyze the data. Findings The results of this study indicated that motorcycle and automobile noises were considered as the most important sounds disturbing the acoustic comfort, and sounds of children’s play, water, talking and businesses were the most important factors promoting the acoustic comfort in the historic squares. Originality/value The paper highlights the soundscape and acoustic conditions that affect the tourisms in the traditional and tourism square in historical context of Yazd city.
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Zakri, Keysha Wellviestu, Raden Sugeng Joko Sarwono, Sigit Puji Santosa, and F. X. Nugroho Soelami. "Modeling and Validation of Acoustic Comfort for Electric Vehicle Using Hybrid Approach Based on Soundscape and Psychoacoustic Methods." World Electric Vehicle Journal 16, no. 2 (January 22, 2025): 64. https://doi.org/10.3390/wevj16020064.
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This paper evaluated the acoustic characteristics of electric vehicles (EVs) using both psychoacoustic and soundscape methodologies by analyzing three key psychoacoustic parameters: loudness, roughness, and sharpness. Through correlation analysis between perceived values and objective parameters, we identified specific sound sources requiring improvement, including vehicle body acoustics, wheel noise, and acceleration-related sounds. The relationship between comfort perception and acoustic parameters showed varying correlations: loudness (0.0411), roughness (2.3452), and sharpness (0.9821). Notably, the overall correlation coefficient of 0.5 suggests that psychoacoustic parameters alone cannot fully explain human comfort perception in EVs. The analysis of sound propagation revealed elevated vibration levels specifically in the driver’s seat area compared to other vehicle regions, identifying key targets for improvement. The research identified significant acoustic events at three key frequencies (50 Hz, 250 Hz, and 450 Hz), requiring in-depth analysis to determine their sources and understand their effects on the vehicle’s NVH characteristics. The study successfully validated its results by demonstrating that a combined approach using both psychoacoustic and soundscape parameters provides a more comprehensive understanding of passenger acoustic perception. This integrated methodology effectively identified specific areas needing acoustic refinement, including: frame vibration noise during rough road operation; tire-generated noise; and acceleration-related sound emissions.
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Vidhushini, R., Surya Rajkumar, and Ebin Horrison. "A Study on Thermal and Acoustic comfort in an Institutional Building." IOP Conference Series: Earth and Environmental Science 1210, no. 1 (July 1, 2023): 012009. http://dx.doi.org/10.1088/1755-1315/1210/1/012009.
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Abstract The indoor environment in educational buildings like schools and colleges need to provide a healthy atmosphere to encourage the students towards learning and improve their productivity. In educational buildings, both thermal and acoustical comfort depend on the site and there exists a relationship among buildings, open spaces, building design with external factors and also its interior design. The aim of the current paper is to study the thermal and acoustic principles in detail and analyze the factors that impact the occupant’s health and comfort by field study method in a school building. Both thermal and acoustical factors that influence the occupants’ health and comfort are highlighted in this study and prioritized for necessary enhancements in the school building. A central board school building was identified for the study and the paper discusses about the site features and building design. For this study, the field data was recorded during 2019. Based on the data collected, analysis was conducted on the influencing factors on thermal and acoustical comfort of the school building. The methodology of the work includes an understanding about the influencing factors of thermal and acoustical comfort with documentation of the school building design, field study measurements in the identified school building and analysing the building design with field measurements on thermal and acoustical factors in school building. The field study measurements were recorded using a Thermo-anemometer and a data logger to collect the data on temperature, humidity and wind speed. Subjective analysis was conducted about comfort and noise level among the students aged between 9 and 16 using a questionnaire survey. The opportunities for improving the occupants’ well being and comfort include various measures that are listed herewith; appropriate shading of the windows that can reduce the heat transfer into the building; well-channelized air movement into the indoor environment to improve the occupants’ comfort; and replacing the paved surfaces with grasscrete or aligning the axis path with shrubs to reduce the radiation towards the indoor surfaces. On the other hand, the selection of the appropriate building materials for wall construction provides an oppurtunity to increase the indoor environmental quality. It can also act as insulation to reduce the noise level in the classrooms.
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Barkas, Nikos. "The Contribution of the Stage Design to the Acoustics of Ancient Greek Theatres." Acoustics 1, no. 1 (March 23, 2019): 337–53. http://dx.doi.org/10.3390/acoustics1010018.
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The famous acoustics of ancient Greek theatres rely on a successful combination of appropriate location and architectural design. The theatres of the ancient world effectively combine two contradictory requirements: large audience capacity and excellent aural and visual comfort. Despite serious alterations resulting from either Roman modifications or accumulated damage, most of these theatres are still theatrically and acoustically functional. Acoustic research has proven that ancient theatres are applications of a successful combination of the basic parameters governing the acoustic design of open-air venues: elimination of external noise, harmonious arrangement of the audience around the performing space, geometric functions among the various parts of the theatre, reinforcement of the direct sound through positive sound reflections, and suppression of the delayed sound reflections or reverberation. Specifically, regarding the acoustic contribution of the stage building, it is important to clarify the consecutive modifications of the skene in the various types of theatres, given the fact that stage buildings were almost destroyed in most ancient Greek theatres. This paper attempts to demonstrate the positive role of the scenery in contemporary performances of ancient drama to improve the acoustic comfort using data from a sample of twenty (20) ancient theatres in Greece.
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Dziechciowski, Zygmunt. "Selection of Plate Components of Operator's Cabin Walls in Aspect of Thermal Insulation and Transmission Loss." Archives of Acoustics 36, no. 1 (February 1, 2011): 109–19. http://dx.doi.org/10.2478/v10168-011-0012-1.
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AbstractThe modern cabin of heavy duty machines have to fulfil a number of requirements which deal with operators' work comfort. More and more often, the vibroacoustic and thermal comforts decide about the cabin quality. This paper presents principles of acoustic and thermal calculations as well as their use in combined assessment.
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CEVİKBAS, Murat. "TURKİYE’DE MEVCUT KONUT BİNALARINDA KAT SEVİYESİNİN, DIŞ DUVAR KALINLIĞININ VE MANTOLAMANIN AKUSTİK KONFOR ÜZERİNE ETKİSİNİN BELİRLENMESİ." Mühendislik Bilimleri ve Tasarım Dergisi 10, no. 3 (September 30, 2022): 963–72. http://dx.doi.org/10.21923/jesd.1072817.
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Since people spend most of their time in the residences especially during the pandemic, acoustic comfort has come into prominence. Many studies were conducted to improve acoustic comfort. Notwithstanding the fruitful existing studies, there is no study detecting the correlation of building elements with acoustic comfort. Therefore, in this study, the correlation of floor levels, wall thickness and the availability of jacketing with the acoustic performances of existing residential buildings constructed before 2017 were investigated according to Regulation on the Protection Against Noise in Buildings entering into force on 31st May 2017 with Official Gazette. The noise levels of 155 residences in residential buildings were investigated and correlations of the level of the floor, exterior wall thicknesses and jacketing with the noise comfort were detected with the help of Pearson Correlation computed via SPSS software. It is believed that this study will improve practical implementations of existing standards in the construction industry.
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Arenas, Jorge P., and Kimihiro Sakagami. "Sustainable Acoustic Materials." Sustainability 12, no. 16 (August 13, 2020): 6540. http://dx.doi.org/10.3390/su12166540.
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Technological advances in materials science, manufacturing processes, chemistry and nanoscience have led to enormous developments in innovatively engineered materials over recent decades. Among them, sustainable acoustic materials have helped to improve acoustical comfort in built environments, and their use is rapidly growing in the architecture, automotive, aerospace and construction industries. These materials are manufactured through a responsible interaction with the environment in order to avoid a depletion or degradation of the natural resources, and to allow for long-term environmental quality. This Special Issue reports on some research studies on membrane absorbers and fibrous materials of natural origin that can be sustainable alternatives to traditional acoustic materials.
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Elmehdi, Hussein, and Ania Tato. "Acoustic Comfort in Hybrid Learning Spaces: Students Perspective." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 3 (February 1, 2023): 4826–31. http://dx.doi.org/10.3397/in_2022_0696.
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In this paper, we assess the acoustic environment comfort at the University of Sharjah after classes have been reconfigured in response to COVID-19 pandemic protocols, which included reducing the number of seats to comply with social distancing to support the hybrid teaching model. First, we measured the background noise and reverberation times for the different types of classrooms. The results showed classrooms do not comply with international standards where acoustic comfort indicators are higher than the recommended values. For example, the background noise levels were found to range from 43.9 - 49.6 dB(A), which is higher than the recommended WHO limits. To evaluate the acoustic comfort from the perspective of the main stakeholder; the students, we conducted a subjective survey to evaluate students' perception of the acoustic conditions at the classrooms. The results indicate that the majority of the students surveyed, (88%) felt that noise in classrooms affected their understanding of the material and communication with the instructor and peers. Noise sources were mainly identified to originate from corridors, maintenance work, and construction sites within close proximity to the classrooms. Better designs are highly recommended to improve acoustic comfort to ensure an excellent student experience and the best learning environment.
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Cășeriu, Bianca-Mihaela, Manuela-Rozalia Gabor, Petruța Blaga, and Cristina Veres. "Quantitative Analysis of Predictors of Acoustic Materials for Noise Reduction as Sustainable Strategies for Materials in the Automotive Industry." Applied Sciences 14, no. 22 (November 12, 2024): 10400. http://dx.doi.org/10.3390/app142210400.
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This study proposes a qualitative analysis for identifying the best predictors for ensuring passive noise control, aiming to achieve superior acoustic comfort in transportation systems. The study is based on real experimental data, collected through acoustic measurements performed by the authors on materials from six different classes and employs a multidisciplinary approach, including Mann–Whitney U tests, Kruskal–Wallis analysis with Dunn’s post hoc multiple comparisons and multilinear regression. This research presents an analysis and evaluation of how the physical properties of various materials influence acoustic comfort, acoustic absorption class and absorption class performance and proposes quantitative models for material selection to address sustainable strategies in the automotive industry. The results highlight significant differences between material categories in terms of acoustic absorption properties and demonstrate the importance of rigorous material selection in vehicle design to enhance acoustic comfort. Additionally, the research contributes to the development of predictive models that estimate acoustic performance based on the physical properties of materials, providing a basis for optimizing material selection in the design phase.
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Lee, Joonhee, Roderick Mackenzie, Vincent Le Men, François Gariépy, and Farideh Zarei. "The effect of sound masking on employees' acoustic comfort and performance in open-plan offices in Canada." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5678–83. http://dx.doi.org/10.3397/in-2021-3215.
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Sound masking systems are commonly used in open-plan offices to generate a controlled minimum level of background sound, in order to decrease the signal-to-noise ratio of intrusive speech and blend out transient office noise. However, a question in the acoustical design of offices is whether the self-generated noise of occupants may alone be sufficient to provide the background sound level conditions necessary to achieve similar levels of speech privacy and acoustic comfort as sound masking systems. This study examines the relationship between occupant-perceived speech privacy and acoustic comfort under three different acoustic scenarios (no masking, controlled 42 dBA, and 47 dBA masking sound levels). The study was conducted pre-COVID-19 in two separate open-plan offices located in Quebec, Canada that at the time were close to full occupancy. Employees completed subjective questionnaires before and after each change in conditions, focusing on how the sound environment impacted their comfort and work performance during the study. Statistical results show that the occupants were significantly more satisfied during the two sound masking conditions in comparison to the no-masking condition, where only the occupant-generated and exterior/mechanical system noise was present as the background sound. Implications for open-plan offices with lower occupancy conditions post-COVID-19 are discussed.
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JAGNIATINSKIS, Aleksandras, Boris FIKS, Marius MICKAITIS, and Ritoldas ŠUKYS. "Features of sound classification scheme designated to label buildings in Lithuania." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, no. 3 (March 2, 2017): 409–20. http://dx.doi.org/10.3846/13923730.2016.1269021.
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In Lithuania’s case, the legal requirements for the building acoustic quality since the year 2004 has been expressed through the sound classification scheme (SCS). The relationship of the subjective indoor acoustic comfort with the value of objective sound insulation was considered as a core for the classification scheme. SCS was designed to provide at least one sound class as a request for the newly erected building, other lower classes for reconstructed buildings and higher classes for premises with enhanced acoustic comfort. The adopted scheme contains five sound classes with various steps between them and is based on rating by two different sound insulation descriptors both having the same limit value. A request to protect against noise for newly erected and reconstructed buildings was enforced via the mandatory pre-completion acoustical testing. The database collected during testing allowed for the analysis of about 2000 in situ measurements of sound insulation properties of building partitions. It showed that the possibility of selecting either of the two airborne sound insulation descriptors Dn,T,w or R’w ensures better conformity with subjective comfort perception. This paper also addresses the particularities and advantages of simultaneous application of two different descriptors for regulation of sound insulation performance of dwellings.