Pub Date : 2024-01-02DOI: 10.1177/1351010x231219662
Javad Isavand, Afshar Kasaei, Andrew Peplow, Jihong Yan
Through the advancement of Data Science methodologies, a new era in output-only identification techniques has been inaugurated, driven by the integration of data-driven methodologies within the realm of Structural Health Monitoring (SHM). This study endeavors to introduce a simplified data-driven approach catering to System Identification (SI) and Response Estimation (RE). This is realized through the utilization of a summation of sine functions, fashioned as a model to harmonize with time domain vibration and acoustic responses. The fidelity of the findings is subsequently authenticated through the application of the Frequency Domain Decomposition (FDD) technique. In addition to the identification process, the proposed approach extends its applicability to predicting time domain responses at novel locations. This augmentation is achieved by harnessing an enhanced methodology founded on the principles of the Dynamic Mode Decomposition (DMD) technique. The veracity of these predicted outcomes is underscored through a comparison with measurements recorded at the same locations, alongside concurrent analysis of DMD-derived results. In order to affirm the efficacy of the proposed methodology, a case study involving a building grappling with enigmatic vibration issues is meticulously selected. The findings underscore that the proposed technique not only adeptly discerns unidentified vibrations without resorting to frequency domain transformation techniques, but also facilitates precise estimation of time domain responses.
{"title":"Enhancing response estimation and system identification in structural health monitoring through data-driven approaches","authors":"Javad Isavand, Afshar Kasaei, Andrew Peplow, Jihong Yan","doi":"10.1177/1351010x231219662","DOIUrl":"https://doi.org/10.1177/1351010x231219662","url":null,"abstract":"Through the advancement of Data Science methodologies, a new era in output-only identification techniques has been inaugurated, driven by the integration of data-driven methodologies within the realm of Structural Health Monitoring (SHM). This study endeavors to introduce a simplified data-driven approach catering to System Identification (SI) and Response Estimation (RE). This is realized through the utilization of a summation of sine functions, fashioned as a model to harmonize with time domain vibration and acoustic responses. The fidelity of the findings is subsequently authenticated through the application of the Frequency Domain Decomposition (FDD) technique. In addition to the identification process, the proposed approach extends its applicability to predicting time domain responses at novel locations. This augmentation is achieved by harnessing an enhanced methodology founded on the principles of the Dynamic Mode Decomposition (DMD) technique. The veracity of these predicted outcomes is underscored through a comparison with measurements recorded at the same locations, alongside concurrent analysis of DMD-derived results. In order to affirm the efficacy of the proposed methodology, a case study involving a building grappling with enigmatic vibration issues is meticulously selected. The findings underscore that the proposed technique not only adeptly discerns unidentified vibrations without resorting to frequency domain transformation techniques, but also facilitates precise estimation of time domain responses.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"17 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139452687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-25DOI: 10.1177/1351010x231217139
Mark Hedrick, Cydney Braumuller, Sarah Gunning, Kathleen Faulkner, Philip Van Peborgh
We sought to determine the effects of classroom loudspeaker position, model of loudspeaker, and talker accent on mental effort or cognitive load, word clarity, sound quality, and word recognition. Thirty-one typically-developed university students whose native language is English rated and transcribed recorded sentences produced by a native English talker and a native Dutch talker speaking English. The listeners were seated in acoustically pre-calibrated locations in a classroom and were presented 10 sentences at conversational level in each of four randomized conditions: from a conventional classroom loudspeaker in front or mounted above them, and from a loudspeaker optimized for speech reproduction placed in front or mounted above them. At the front of the classroom was a muted video recording of one of the talkers delivering an online lecture. Results showed front-located speakers yielded less cognitive effort, better sound quality, and better word clarity—showing importance of congruence of loudspeaker/talker position.
{"title":"Effect of loudspeaker position and model on cognitive load, quality, clarity, and sentence recognition performance","authors":"Mark Hedrick, Cydney Braumuller, Sarah Gunning, Kathleen Faulkner, Philip Van Peborgh","doi":"10.1177/1351010x231217139","DOIUrl":"https://doi.org/10.1177/1351010x231217139","url":null,"abstract":"We sought to determine the effects of classroom loudspeaker position, model of loudspeaker, and talker accent on mental effort or cognitive load, word clarity, sound quality, and word recognition. Thirty-one typically-developed university students whose native language is English rated and transcribed recorded sentences produced by a native English talker and a native Dutch talker speaking English. The listeners were seated in acoustically pre-calibrated locations in a classroom and were presented 10 sentences at conversational level in each of four randomized conditions: from a conventional classroom loudspeaker in front or mounted above them, and from a loudspeaker optimized for speech reproduction placed in front or mounted above them. At the front of the classroom was a muted video recording of one of the talkers delivering an online lecture. Results showed front-located speakers yielded less cognitive effort, better sound quality, and better word clarity—showing importance of congruence of loudspeaker/talker position.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"6 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139159328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.1177/1351010x231213597
Yannick Sluyts, Majid Lavasani, M. Rychtáriková, C. Glorieux
ETFE cushions are used as cladding in predominantly mid to large size architectural projects. Smaller cushions are about 10 m2 in size and the biggest single cushions can be several hundreds of square metres large. They are composed of ETFE membranes a few hundred of micrometres thick. From a point of view of room acoustics, their acoustic transparency, which increases with decreasing frequency, makes them to effectively act like sound absorbers. Their voluminous nature and transparency make it challenging to measure the sound absorption coefficient of ETFE cushions in a laboratory. Using the genetic material optimizer of Odeon® software, the effective sound absorption coefficient of ETFE cushions in four rooms was extracted from room acoustic parameters, which were in turn derived from measured room impulse response data. The results were compared and interpreted by the help of theoretical modelling and measurements on small cushions in a reverberant room. There is a relatively good agreement between the three types of results, possible causes for the differences are explained in the paper.
{"title":"Determination of the sound absorption coefficient of ETFE cushions in-situ using the genetic material optimizer in Odeon®","authors":"Yannick Sluyts, Majid Lavasani, M. Rychtáriková, C. Glorieux","doi":"10.1177/1351010x231213597","DOIUrl":"https://doi.org/10.1177/1351010x231213597","url":null,"abstract":"ETFE cushions are used as cladding in predominantly mid to large size architectural projects. Smaller cushions are about 10 m2 in size and the biggest single cushions can be several hundreds of square metres large. They are composed of ETFE membranes a few hundred of micrometres thick. From a point of view of room acoustics, their acoustic transparency, which increases with decreasing frequency, makes them to effectively act like sound absorbers. Their voluminous nature and transparency make it challenging to measure the sound absorption coefficient of ETFE cushions in a laboratory. Using the genetic material optimizer of Odeon® software, the effective sound absorption coefficient of ETFE cushions in four rooms was extracted from room acoustic parameters, which were in turn derived from measured room impulse response data. The results were compared and interpreted by the help of theoretical modelling and measurements on small cushions in a reverberant room. There is a relatively good agreement between the three types of results, possible causes for the differences are explained in the paper.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"67 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1177/1351010x231216016
Hatice Kubra Kurukose Cal, Jian Kang, F. Aletta
School acoustics is pivotal for children’s well-being given their substantial time commitment to education within these environments, with potential positive or negative impacts. Soundscape has gained relevance in various settings, including indoor environments, and explores both positive and negative responses of individuals to sounds within a context. This scoping review aims to investigate the application of the soundscape approach within the school environment, with a primary focus on evaluating perceptions of the acoustic environment. It aims to identify key factors considered in the studies, such as age groups, sound sources, and methodologies. A Scopus search was conducted, covering the period from January 2000 to September 2023. The search was limited to peer-reviewed articles published in English. The inclusion criteria required studies to investigate schools and assess the perceptions. After screening, 11 studies met the inclusion criteria from 49 articles. The most targeted age cohort was primary school-aged children. Yet, the need to consider secondary school children’s perceptions persists. The dominant sounds investigated were categorized as “negative” sounds, referring to auditory stimuli that are commonly perceived as unpleasant. These negative sounds were primarily traffic-induced noise. The prevailing method used was questionnaires. To advance school soundscape research, exploring secondary school-aged children’s views would provide valuable insights. By enhancing knowledge in this field, researchers can improve school acoustics for student well-being. Notably, a limitation of this review is that soundscape studies have centered around urban environments so far. Consequently, there have been only a limited number of studies examining indoor environments, and even less for schools.
{"title":"Methodological approaches and main factors considered in school soundscape studies: A scoping review","authors":"Hatice Kubra Kurukose Cal, Jian Kang, F. Aletta","doi":"10.1177/1351010x231216016","DOIUrl":"https://doi.org/10.1177/1351010x231216016","url":null,"abstract":"School acoustics is pivotal for children’s well-being given their substantial time commitment to education within these environments, with potential positive or negative impacts. Soundscape has gained relevance in various settings, including indoor environments, and explores both positive and negative responses of individuals to sounds within a context. This scoping review aims to investigate the application of the soundscape approach within the school environment, with a primary focus on evaluating perceptions of the acoustic environment. It aims to identify key factors considered in the studies, such as age groups, sound sources, and methodologies. A Scopus search was conducted, covering the period from January 2000 to September 2023. The search was limited to peer-reviewed articles published in English. The inclusion criteria required studies to investigate schools and assess the perceptions. After screening, 11 studies met the inclusion criteria from 49 articles. The most targeted age cohort was primary school-aged children. Yet, the need to consider secondary school children’s perceptions persists. The dominant sounds investigated were categorized as “negative” sounds, referring to auditory stimuli that are commonly perceived as unpleasant. These negative sounds were primarily traffic-induced noise. The prevailing method used was questionnaires. To advance school soundscape research, exploring secondary school-aged children’s views would provide valuable insights. By enhancing knowledge in this field, researchers can improve school acoustics for student well-being. Notably, a limitation of this review is that soundscape studies have centered around urban environments so far. Consequently, there have been only a limited number of studies examining indoor environments, and even less for schools.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"12 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139213687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-09DOI: 10.1177/1351010x231206240
Jeffrey Mahn, Markus Müller-Trapet
From Gerretsen’s 1979 Applied Acoustics paper through four series of standards including ISO 12354 and ISO 10848, a significant amount of effort has gone into creating a standardized prediction method that uses standardized laboratory measured values to predict the apparent sound reduction index to demonstrate compliance with regulations. The terms and equations in the prediction method have evolved over time as researchers have evaluated the results of the prediction method, especially in the case of lightweight constructions for which statistical energy analysis is not well suited. To reflect the changes to other equations in the prediction method over the past 40 years, this paper suggests an update to the relationship in ISO 12354-1 between the in situ flanking sound reduction index and the laboratory measured flanking normalized level difference. The suggested changes are of importance for Type B elements such as timber and steel framed walls and floors for which the prediction of flanking transmission according to ISO 12354 requires the measurement of the level difference in laboratory flanking facilities.
{"title":"The relationship between the in situ flanking sound reduction index and the laboratory measured flanking normalized level difference","authors":"Jeffrey Mahn, Markus Müller-Trapet","doi":"10.1177/1351010x231206240","DOIUrl":"https://doi.org/10.1177/1351010x231206240","url":null,"abstract":"From Gerretsen’s 1979 Applied Acoustics paper through four series of standards including ISO 12354 and ISO 10848, a significant amount of effort has gone into creating a standardized prediction method that uses standardized laboratory measured values to predict the apparent sound reduction index to demonstrate compliance with regulations. The terms and equations in the prediction method have evolved over time as researchers have evaluated the results of the prediction method, especially in the case of lightweight constructions for which statistical energy analysis is not well suited. To reflect the changes to other equations in the prediction method over the past 40 years, this paper suggests an update to the relationship in ISO 12354-1 between the in situ flanking sound reduction index and the laboratory measured flanking normalized level difference. The suggested changes are of importance for Type B elements such as timber and steel framed walls and floors for which the prediction of flanking transmission according to ISO 12354 requires the measurement of the level difference in laboratory flanking facilities.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":" 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135291255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-04DOI: 10.1177/1351010x231209609
Agus Rino, Iwan Prasetiyo, Damar Rastri Adhika, Bambang Sunendar, Azma Putra
Porous ceramic composite materials are fabricated for sound absorber materials. The ceramic composites are made from silica (SiO 2 ) with a filler mixture to change the pore structure. Natural fillers synthesized from sugarcane bagasse with compositions of 0.5, 0.75, and 1.0 g are considered for sound absorber fabrication. Each filler weight comes with three different fiber sizes, namely 212, 425, and 630 µm. Subsequently, a blowing agent made of Al 2 O 3 and CaCO 3 is added to create pores in the composite, while a binder made of a mixture of gypsum powder and Portland Composite Cement (PCC) is used to bind the whole ceramic composite materials. Sound absorption coefficients α of each sample are evaluated by using impedance tube measurements according to ISO 10534-2. The results suggest that adding 0.5, 0.75, and 1 g filler gives the composite an absorption coefficient of 50%–80%, 60%–90%, and 75%–90%, respectively.
{"title":"Development of porous composite ceramic with sugarcane fiber filler for sound absorber materials","authors":"Agus Rino, Iwan Prasetiyo, Damar Rastri Adhika, Bambang Sunendar, Azma Putra","doi":"10.1177/1351010x231209609","DOIUrl":"https://doi.org/10.1177/1351010x231209609","url":null,"abstract":"Porous ceramic composite materials are fabricated for sound absorber materials. The ceramic composites are made from silica (SiO 2 ) with a filler mixture to change the pore structure. Natural fillers synthesized from sugarcane bagasse with compositions of 0.5, 0.75, and 1.0 g are considered for sound absorber fabrication. Each filler weight comes with three different fiber sizes, namely 212, 425, and 630 µm. Subsequently, a blowing agent made of Al 2 O 3 and CaCO 3 is added to create pores in the composite, while a binder made of a mixture of gypsum powder and Portland Composite Cement (PCC) is used to bind the whole ceramic composite materials. Sound absorption coefficients α of each sample are evaluated by using impedance tube measurements according to ISO 10534-2. The results suggest that adding 0.5, 0.75, and 1 g filler gives the composite an absorption coefficient of 50%–80%, 60%–90%, and 75%–90%, respectively.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"109 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135773386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-30DOI: 10.1177/1351010x231206077
Fredrik Ljunggren, Christian Simmons
In this paper, the acoustical quality in apartment housing is studied. The purpose is to find out to what extent occupants are annoyed by indoor noise and to compare the annoyance with measured airborne and impact sound insulation. The occupants in 38 building cases in Sweden, grouped into different construction categories, were asked in a questionnaire to rate their annoyance for a variety of potentially disturbing sound sources. In total, 1230 individual responses were used for the statistical analyses. The result shows that on average, the occupants are quite satisfied and reported low annoyance. This is taken as an indication that the present National legislation for sound insulation, airborne sound insulation included, works well. However, annoyance from footstep of walking neighbours is an exception, causing significantly greater annoyance compared to any other source, especially among occupants in lightweight buildings. The commonly used impact sound insulation descriptors are unable to match subjective experience. In combination with the sensitivity of lightweight floors to low-frequency sounds, improper building designs are likely to result in poor noise protection for the occupants. To overcome this issue, a new single number quantity taking frequencies as low as 25 Hz into account is suggested.
{"title":"Sound insulation in multi-family houses: Proposal of single number limits for acoustical protection and comfort","authors":"Fredrik Ljunggren, Christian Simmons","doi":"10.1177/1351010x231206077","DOIUrl":"https://doi.org/10.1177/1351010x231206077","url":null,"abstract":"In this paper, the acoustical quality in apartment housing is studied. The purpose is to find out to what extent occupants are annoyed by indoor noise and to compare the annoyance with measured airborne and impact sound insulation. The occupants in 38 building cases in Sweden, grouped into different construction categories, were asked in a questionnaire to rate their annoyance for a variety of potentially disturbing sound sources. In total, 1230 individual responses were used for the statistical analyses. The result shows that on average, the occupants are quite satisfied and reported low annoyance. This is taken as an indication that the present National legislation for sound insulation, airborne sound insulation included, works well. However, annoyance from footstep of walking neighbours is an exception, causing significantly greater annoyance compared to any other source, especially among occupants in lightweight buildings. The commonly used impact sound insulation descriptors are unable to match subjective experience. In combination with the sensitivity of lightweight floors to low-frequency sounds, improper building designs are likely to result in poor noise protection for the occupants. To overcome this issue, a new single number quantity taking frequencies as low as 25 Hz into account is suggested.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"54 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136067524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-25DOI: 10.1177/1351010x231205002
Preeti Gulia, Sourabh Dogra, Arpan Gupta
The present work introduces a novel approach to designing metamaterial for low frequency and high frequency wave attenuation by repurposing plastic waste. The metamaterial is constructed using a duct-like structure with a periodic arrangement of bottles of different sizes. This configuration leads to the formation of a local resonant band, which spans from 240 to 340 Hz. In both the numerical model and the experimental setup, a harmonic excitation is given to the proposed configuration and transmission loss is computed as a function of frequency. The experimental results support the findings obtained from numerical simulations, confirming the effectiveness of the designed metamaterial. One crucial aspect discovered in this work is that introducing space between the bottle’s neck and the side wall of the structure causes the bottles to act as Helmholtz resonators. Thus, in turn, this results in an additional band gap at low frequencies, complementing the existing Bragg’s band gap achieved by the periodic arrangement of bottles. The ability to change the size of the bottles gives control over the position of the band gap, allowing for greater flexibility in tailoring the metamaterial to specific noise attenuation requirements. The applications of these plastic bottle-based metamaterials are wide ranging, especially in improving the indoor acoustic environment of buildings. This work opens up a new avenue for further exploration and innovation in the field of sustainable and environmentally friendly metamaterials.
{"title":"Preliminary study of reuse of plastic bottles as metamaterial","authors":"Preeti Gulia, Sourabh Dogra, Arpan Gupta","doi":"10.1177/1351010x231205002","DOIUrl":"https://doi.org/10.1177/1351010x231205002","url":null,"abstract":"The present work introduces a novel approach to designing metamaterial for low frequency and high frequency wave attenuation by repurposing plastic waste. The metamaterial is constructed using a duct-like structure with a periodic arrangement of bottles of different sizes. This configuration leads to the formation of a local resonant band, which spans from 240 to 340 Hz. In both the numerical model and the experimental setup, a harmonic excitation is given to the proposed configuration and transmission loss is computed as a function of frequency. The experimental results support the findings obtained from numerical simulations, confirming the effectiveness of the designed metamaterial. One crucial aspect discovered in this work is that introducing space between the bottle’s neck and the side wall of the structure causes the bottles to act as Helmholtz resonators. Thus, in turn, this results in an additional band gap at low frequencies, complementing the existing Bragg’s band gap achieved by the periodic arrangement of bottles. The ability to change the size of the bottles gives control over the position of the band gap, allowing for greater flexibility in tailoring the metamaterial to specific noise attenuation requirements. The applications of these plastic bottle-based metamaterials are wide ranging, especially in improving the indoor acoustic environment of buildings. This work opens up a new avenue for further exploration and innovation in the field of sustainable and environmentally friendly metamaterials.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135216552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-25DOI: 10.1177/1351010x231202014
Haydar Aygun, Luis Gomez-Agustina, Stefano Mundula
Human and non-human subjects are exposed to micro plastics through drink, food, and air. Micro-plastics propagating through atmosphere are breathable particles during inhalation and exhalation leading to deposition of them in the deep lung via the alveoli of the lungs. Teabags are made of plastics that are not recyclable and biodegradable. Therefore, we intend to remove used teabags from the natural environment by repurposing them to make sound attenuating panels for building and architectural industries, contributing in this way to a sustainable circular economy. The panels were designed and developed from consumed teabags as porous material by filling a frame to investigate acoustics wave propagation through them at normal incidence. Experimental testing was carried out on circular teabag panels in an impedance tube using a transfer function method to determine their sound absorption coefficient and transmission loss. Furthermore, the impedance gun method was used to determine the absorption properties of square panels. Results show that 75 mm thick circular panels give an absorption coefficient higher than 0.8 between 400 and 1600 Hz. Up-to 9.8 dB sound transmission loss of circular panels is obtained at higher frequencies. Absorption coefficients for square teabag panels are very good despite a coincidence-dip seen at 800 Hz. The satisfactory sound absorption and sound transmission characteristics of acoustic panels made of consumed tea bags can make this recycled material a cost-effective solution in the production of sustainable acoustic treatment in indoor spaces. The results suggest that recycling of consumed teabag as the panel could be applied as alternative sound absorbing materials.
{"title":"Acoustic wave propagation through eco-friendly porous panels at normal incidence","authors":"Haydar Aygun, Luis Gomez-Agustina, Stefano Mundula","doi":"10.1177/1351010x231202014","DOIUrl":"https://doi.org/10.1177/1351010x231202014","url":null,"abstract":"Human and non-human subjects are exposed to micro plastics through drink, food, and air. Micro-plastics propagating through atmosphere are breathable particles during inhalation and exhalation leading to deposition of them in the deep lung via the alveoli of the lungs. Teabags are made of plastics that are not recyclable and biodegradable. Therefore, we intend to remove used teabags from the natural environment by repurposing them to make sound attenuating panels for building and architectural industries, contributing in this way to a sustainable circular economy. The panels were designed and developed from consumed teabags as porous material by filling a frame to investigate acoustics wave propagation through them at normal incidence. Experimental testing was carried out on circular teabag panels in an impedance tube using a transfer function method to determine their sound absorption coefficient and transmission loss. Furthermore, the impedance gun method was used to determine the absorption properties of square panels. Results show that 75 mm thick circular panels give an absorption coefficient higher than 0.8 between 400 and 1600 Hz. Up-to 9.8 dB sound transmission loss of circular panels is obtained at higher frequencies. Absorption coefficients for square teabag panels are very good despite a coincidence-dip seen at 800 Hz. The satisfactory sound absorption and sound transmission characteristics of acoustic panels made of consumed tea bags can make this recycled material a cost-effective solution in the production of sustainable acoustic treatment in indoor spaces. The results suggest that recycling of consumed teabag as the panel could be applied as alternative sound absorbing materials.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"53 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135111530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-23DOI: 10.1177/1351010x231191439
Samantha Di Loreto, Valter Lori, Fabio Serpilli, Camilla Lops, Alessandro Ricciutelli, Sergio Montelpare
The empirical assessment of the quality of the sound landscape in restaurants and how it affects the overall customer experience has only recently begun to be addressed. Noise from recreational activities, such as discos, restaurants, bars, hotels, etc., characterizes the soundscape of tourist centers, where there is a need to ensure the coexistence of noisy commercial activities and the right to rest of citizens customers of accommodation facilities, often already compromised by traffic. Although there is a renewed sensitivity to the issue of noise, restaurants are often characterized by poor acoustics and a poor multi-sensory perception of comfort. This article examines the noise levels of a hotel’s dining room in an Italian tourist resort during lunch and dinner hours. The study included aspects related to the acoustics, lighting, and quality of the location, also for the assessment of the perception of comfort obtained was given to customers a questionnaire of satisfaction during the meal, every day for a week. Considering the correlation between the three components of the soundscape, namely people, sound, and the environment under consideration, this study aims to explore the effects of the soundscape on sound restoration for accommodation facilities in tourist resorts.
{"title":"“Great food, but the noise?”: Relationship between perceived sound quality survey and non acoustical factors in one hotel restaurant in Italy","authors":"Samantha Di Loreto, Valter Lori, Fabio Serpilli, Camilla Lops, Alessandro Ricciutelli, Sergio Montelpare","doi":"10.1177/1351010x231191439","DOIUrl":"https://doi.org/10.1177/1351010x231191439","url":null,"abstract":"The empirical assessment of the quality of the sound landscape in restaurants and how it affects the overall customer experience has only recently begun to be addressed. Noise from recreational activities, such as discos, restaurants, bars, hotels, etc., characterizes the soundscape of tourist centers, where there is a need to ensure the coexistence of noisy commercial activities and the right to rest of citizens customers of accommodation facilities, often already compromised by traffic. Although there is a renewed sensitivity to the issue of noise, restaurants are often characterized by poor acoustics and a poor multi-sensory perception of comfort. This article examines the noise levels of a hotel’s dining room in an Italian tourist resort during lunch and dinner hours. The study included aspects related to the acoustics, lighting, and quality of the location, also for the assessment of the perception of comfort obtained was given to customers a questionnaire of satisfaction during the meal, every day for a week. Considering the correlation between the three components of the soundscape, namely people, sound, and the environment under consideration, this study aims to explore the effects of the soundscape on sound restoration for accommodation facilities in tourist resorts.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135966335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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