Pub Date : 2020-06-01DOI: 10.1177/1351010X20917874
J. Olsson, Andreas Linderholt
Traditionally, product development concerning acoustics in the building industry is measurement oriented. For lightweight floors, frequencies that are lower than the frequency range for heavy concrete floors are an issue. The frequency range of from 50 Hz down to 20 Hz influences the human perception of impact sound in multi-story apartment buildings with lightweight floor constructions, such as timber floors, for example. It is well known that a lower frequency range of interest makes finite element simulations more feasible. Strategies for reducing impact sound tend to be less straightforward for timber floors because they have a larger variation of designs when compared to concrete floors. This implies that reliable finite element simulations of impact sound can save time and money for the building industry. This study researches the impact sound transmission of lightweight timber floors. Frequency response functions, from forces on excitation points to sound pressure in the receiving cavity below, are calculated. By using fluid elements connected to reflection-free boundary elements under the floors in the models, the transmission and insulation can be studied without involving reverberation. A floor model with a hard screed surface will have a larger impact force than a softer floor, although this issue seems less pronounced at the lowest frequencies. To characterize floor surfaces, the point mobilities of the impact points are also calculated and presented. The vibration and sound transmission levels are dependent on the selection of the excitation points.
{"title":"Low-frequency impact sound of timber floors: A finite element–based study of conceptual designs","authors":"J. Olsson, Andreas Linderholt","doi":"10.1177/1351010X20917874","DOIUrl":"https://doi.org/10.1177/1351010X20917874","url":null,"abstract":"Traditionally, product development concerning acoustics in the building industry is measurement oriented. For lightweight floors, frequencies that are lower than the frequency range for heavy concrete floors are an issue. The frequency range of from 50 Hz down to 20 Hz influences the human perception of impact sound in multi-story apartment buildings with lightweight floor constructions, such as timber floors, for example. It is well known that a lower frequency range of interest makes finite element simulations more feasible. Strategies for reducing impact sound tend to be less straightforward for timber floors because they have a larger variation of designs when compared to concrete floors. This implies that reliable finite element simulations of impact sound can save time and money for the building industry. This study researches the impact sound transmission of lightweight timber floors. Frequency response functions, from forces on excitation points to sound pressure in the receiving cavity below, are calculated. By using fluid elements connected to reflection-free boundary elements under the floors in the models, the transmission and insulation can be studied without involving reverberation. A floor model with a hard screed surface will have a larger impact force than a softer floor, although this issue seems less pronounced at the lowest frequencies. To characterize floor surfaces, the point mobilities of the impact points are also calculated and presented. The vibration and sound transmission levels are dependent on the selection of the excitation points.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"28 1","pages":"17 - 34"},"PeriodicalIF":1.7,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X20917874","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44990617","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 : 2020-06-01DOI: 10.1177/1351010X19896346
N. Subramaniam, K. Ramamurthy
Global and acoustic–phonetic correlates of speech intelligibility are important measures of talker intelligibility. Speech characteristics have been evaluated using speech samples that involve reading pre-administered passages under controlled environments. In classrooms, lecturing is the mode of speech delivery. The presence of noise from ceiling fans and other external noise hinder the speech communication process. This study evaluated the talkers’ speech characteristics utilizing recordings from graduate students under reading and lecturing modes and in the presence and absence of noise generated by ceiling fans. The acoustical conditions under which talkers delivered their speech were characterized using octave band U50 values. Global and acoustic–phonetic correlates of talker intelligibility were measured and the variation in correlates of speech intelligibility was statistically analyzed. The results revealed that talkers significantly modified their speech characteristics relevant to intelligibility across modes of speech delivery and in the presence of noise. Fundamental frequency measures such as F0-mean and F0-SD and durational measures such as speech and pause rates were all found to be higher for lecture mode of delivery. Talkers showed similar vowel-articulatory changes under the two modes of delivery. When lecturing in the presence of noise, talkers significantly reduced the length of pauses and also utilized a combination of vowel-articulatory strategies to overcome the presence of noise. The results suggest the need to investigate talkers’ speech adaptation in real classroom environments in terms of correlates of speech intelligibility and to reconsider classroom acoustical guidelines in view of both listener and talker intelligibilities.
{"title":"Effect of mode of delivery and background noise on speech characteristics of talkers in a classroom environment","authors":"N. Subramaniam, K. Ramamurthy","doi":"10.1177/1351010X19896346","DOIUrl":"https://doi.org/10.1177/1351010X19896346","url":null,"abstract":"Global and acoustic–phonetic correlates of speech intelligibility are important measures of talker intelligibility. Speech characteristics have been evaluated using speech samples that involve reading pre-administered passages under controlled environments. In classrooms, lecturing is the mode of speech delivery. The presence of noise from ceiling fans and other external noise hinder the speech communication process. This study evaluated the talkers’ speech characteristics utilizing recordings from graduate students under reading and lecturing modes and in the presence and absence of noise generated by ceiling fans. The acoustical conditions under which talkers delivered their speech were characterized using octave band U50 values. Global and acoustic–phonetic correlates of talker intelligibility were measured and the variation in correlates of speech intelligibility was statistically analyzed. The results revealed that talkers significantly modified their speech characteristics relevant to intelligibility across modes of speech delivery and in the presence of noise. Fundamental frequency measures such as F0-mean and F0-SD and durational measures such as speech and pause rates were all found to be higher for lecture mode of delivery. Talkers showed similar vowel-articulatory changes under the two modes of delivery. When lecturing in the presence of noise, talkers significantly reduced the length of pauses and also utilized a combination of vowel-articulatory strategies to overcome the presence of noise. The results suggest the need to investigate talkers’ speech adaptation in real classroom environments in terms of correlates of speech intelligibility and to reconsider classroom acoustical guidelines in view of both listener and talker intelligibilities.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"27 1","pages":"113 - 135"},"PeriodicalIF":1.7,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X19896346","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42398769","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 : 2020-06-01DOI: 10.1177/1351010X19893593
A. Milo
This article discusses the integration of acoustic design approaches into architectural design education settings. Solving architectural acoustic problems has been for centuries one of the primary aims of theories and experiments in acoustics. Recent contributions offered by the soundscape approach have highlighted broader desirable aims which acoustic designers should pursue, fostering ecological reasoning on the acoustic environment and its perception as a whole. Drawing from the available literature, some examples are brought to show the integration of architectural acoustics and soundscape approaches into the realm of architectural design education, highlighting the significance of specific design situations and aural training techniques in learning contexts.
{"title":"The acoustic designer: Joining soundscape and architectural acoustics in architectural design education","authors":"A. Milo","doi":"10.1177/1351010X19893593","DOIUrl":"https://doi.org/10.1177/1351010X19893593","url":null,"abstract":"This article discusses the integration of acoustic design approaches into architectural design education settings. Solving architectural acoustic problems has been for centuries one of the primary aims of theories and experiments in acoustics. Recent contributions offered by the soundscape approach have highlighted broader desirable aims which acoustic designers should pursue, fostering ecological reasoning on the acoustic environment and its perception as a whole. Drawing from the available literature, some examples are brought to show the integration of architectural acoustics and soundscape approaches into the realm of architectural design education, highlighting the significance of specific design situations and aural training techniques in learning contexts.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"27 1","pages":"112 - 83"},"PeriodicalIF":1.7,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X19893593","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48700039","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 : 2020-05-27DOI: 10.1177/1351010X20921038
N. Granzotto, C. Scrosati, F. Scamoni, E. Piana
Gypsum board walls are widely used in today’s buildings. A possible way to considerably increase the sound insulation performances of such lightweight walls is to apply double-layer gypsum panels screwed together. Being the boards separated by a thin air gap, there is no shift of the critical frequency from the single-layer case. Moreover, it is possible to obtain an improvement of the sound insulation performances provided by the additional mass given by the double layer. The thin air layer is, however, responsible for a loss of acoustic performance due to the cavity resonance effect in the frequency range between 800 and 1600 Hz. In this article, the increase in the acoustic insulation achieved through the use of coupled gypsum boards is studied and a modelling technique based on the transfer matrix method is used to simulate the acoustic behaviour of the resulting structure; in particular, the thin air layer between the coupled boards is modelled. The simulations are compared with laboratory measurements carried out according to the international standard series ISO 10140. The transfer matrix approach is found to be suitable to describe the problem, provided that a modified model for the air gap between the boards is applied.
{"title":"Sound reduction index prediction of double-layer gypsum panels through the transfer matrix method","authors":"N. Granzotto, C. Scrosati, F. Scamoni, E. Piana","doi":"10.1177/1351010X20921038","DOIUrl":"https://doi.org/10.1177/1351010X20921038","url":null,"abstract":"Gypsum board walls are widely used in today’s buildings. A possible way to considerably increase the sound insulation performances of such lightweight walls is to apply double-layer gypsum panels screwed together. Being the boards separated by a thin air gap, there is no shift of the critical frequency from the single-layer case. Moreover, it is possible to obtain an improvement of the sound insulation performances provided by the additional mass given by the double layer. The thin air layer is, however, responsible for a loss of acoustic performance due to the cavity resonance effect in the frequency range between 800 and 1600 Hz. In this article, the increase in the acoustic insulation achieved through the use of coupled gypsum boards is studied and a modelling technique based on the transfer matrix method is used to simulate the acoustic behaviour of the resulting structure; in particular, the thin air layer between the coupled boards is modelled. The simulations are compared with laboratory measurements carried out according to the international standard series ISO 10140. The transfer matrix approach is found to be suitable to describe the problem, provided that a modified model for the air gap between the boards is applied.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"28 1","pages":"3 - 16"},"PeriodicalIF":1.7,"publicationDate":"2020-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X20921038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46215920","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 : 2020-05-13DOI: 10.1177/1351010X20917856
G. Iannace, Giuseppe Ciaburro, A. Trematerra
In this study, the data obtained from the acoustic measurements were used to train a model based on logistic regression in order to detect a quadrotor’s vehicle in indoor environment. To simulate a real environment, we made sound recordings in a shopping center. The sounds related to two scenarios were recorded: only anthropic noise and anthropic noise with background music. Later, we reproduced these sounds in an indoor environment of the same size and characteristics as the shopping center. During the simulation test, a drone placed at different distances from the sound level meter was turned on at different speeds to identify their presence in complex acoustic scenarios. Subsequently, these measurements were used to implement a model based on logistic regression for the automatic detection of the unmanned aerial vehicle. Logistic regression is widely used in pattern recognition of the binary dependent variable. This model returns high value of accuracy (0.994), indicating a high number of correct detections. The results obtained in this study suggest the use of this tool for unmanned aerial vehicle detection applications.
{"title":"Acoustical unmanned aerial vehicle detection in indoor scenarios using logistic regression model","authors":"G. Iannace, Giuseppe Ciaburro, A. Trematerra","doi":"10.1177/1351010X20917856","DOIUrl":"https://doi.org/10.1177/1351010X20917856","url":null,"abstract":"In this study, the data obtained from the acoustic measurements were used to train a model based on logistic regression in order to detect a quadrotor’s vehicle in indoor environment. To simulate a real environment, we made sound recordings in a shopping center. The sounds related to two scenarios were recorded: only anthropic noise and anthropic noise with background music. Later, we reproduced these sounds in an indoor environment of the same size and characteristics as the shopping center. During the simulation test, a drone placed at different distances from the sound level meter was turned on at different speeds to identify their presence in complex acoustic scenarios. Subsequently, these measurements were used to implement a model based on logistic regression for the automatic detection of the unmanned aerial vehicle. Logistic regression is widely used in pattern recognition of the binary dependent variable. This model returns high value of accuracy (0.994), indicating a high number of correct detections. The results obtained in this study suggest the use of this tool for unmanned aerial vehicle detection applications.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"28 1","pages":"77 - 96"},"PeriodicalIF":1.7,"publicationDate":"2020-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X20917856","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43178727","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 : 2020-05-11DOI: 10.1177/1351010X20916719
J. L. Zamora Mestre, Andrea Niampira
The use of double-sheet enclosures with an intermediate non-ventilated air cavity guarantees a higher airborne sound insulation. The insulation advantages depend on air tightness and the placement of sound absorbing material in the air cavity. The lightweight ventilated façade is a system constructed by the addition of an external light cladding on a heavy single wall to establish an intermediate air cavity. This air cavity can be ventilated under controlled cooling effects, because of Sun’s radiation, and to reduce the risk of dampness caused by rainwater. Owing to this ventilation, acoustic insulation of the lightweight ventilated façade could be less effective. However, some authors indicate that air cavity moderate ventilation does not necessarily lead to a significant reduction in the airborne sound insulation. The authors previously verified this situation in a real building where the existing façade of masonry walls was transformed into a lightweight ventilated façade. The preliminary results indicate the acoustic benefits can be compatible with the hygrothermal benefits derived from controlled ventilation. This article presents the next step, the evaluation of the lightweight ventilated façade acoustic performance under laboratory conditions to revalidate the previous results and refining aspects as the air cavity thickness or the state of openings ventilation. The main results obtained indicate that the airborne sound insulation in laboratory is aligned with the previous results in a real building. Air cavity thickness from 110 to 175 mm and ventilation openings from 0% to 3.84% of the façade area does not lead to a significant reduction in the airborne sound insulation.
{"title":"Lightweight ventilated façade: Acoustic performance in laboratory conditions, analysing the impact of controlled ventilation variations on airborne sound insulation","authors":"J. L. Zamora Mestre, Andrea Niampira","doi":"10.1177/1351010X20916719","DOIUrl":"https://doi.org/10.1177/1351010X20916719","url":null,"abstract":"The use of double-sheet enclosures with an intermediate non-ventilated air cavity guarantees a higher airborne sound insulation. The insulation advantages depend on air tightness and the placement of sound absorbing material in the air cavity. The lightweight ventilated façade is a system constructed by the addition of an external light cladding on a heavy single wall to establish an intermediate air cavity. This air cavity can be ventilated under controlled cooling effects, because of Sun’s radiation, and to reduce the risk of dampness caused by rainwater. Owing to this ventilation, acoustic insulation of the lightweight ventilated façade could be less effective. However, some authors indicate that air cavity moderate ventilation does not necessarily lead to a significant reduction in the airborne sound insulation. The authors previously verified this situation in a real building where the existing façade of masonry walls was transformed into a lightweight ventilated façade. The preliminary results indicate the acoustic benefits can be compatible with the hygrothermal benefits derived from controlled ventilation. This article presents the next step, the evaluation of the lightweight ventilated façade acoustic performance under laboratory conditions to revalidate the previous results and refining aspects as the air cavity thickness or the state of openings ventilation. The main results obtained indicate that the airborne sound insulation in laboratory is aligned with the previous results in a real building. Air cavity thickness from 110 to 175 mm and ventilation openings from 0% to 3.84% of the façade area does not lead to a significant reduction in the airborne sound insulation.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"27 1","pages":"367 - 379"},"PeriodicalIF":1.7,"publicationDate":"2020-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X20916719","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42303578","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 : 2020-05-06DOI: 10.1177/1351010X20916120
T. Hulland, A. Su, M. Kingan
This article describes an investigation into the noise levels which patients are exposed to in a general inpatient hospital ward in New Zealand. An initial noise survey was conducted over a period of nine consecutive days in order to establish the noise levels in the ward. It was identified that noise levels increased dramatically between 4:00 a.m. and 7:00 a.m. In order to identify the sources of noise during this period, three noise surveys were undertaken between 4:30 a.m. and 7:00 a.m. on typical weekdays using a microphone placed inside a shared bedroom. During the noise survey, an observer identified the noise sources and their locations for significant noise events. Noise sources were then categorised into three main groups based on the character of the source (machine, staff or patient). Staff noise was found to account for 64% of the total duration of significant noise events (29% of the number of events) which occurred during the observations compared with 20% from patients (43% of the number of events) and 16% from machines (28% of the number of events). It was found that many staff and machine noise events could be mitigated or eliminated. Methods for mitigating noise are suggested and an experimental method was used to estimate the likely reduction in noise which could be attained by moving a staff conversation from the corridor outside the observed bedroom to other locations on the ward.
{"title":"Noise in an inpatient hospital ward in New Zealand","authors":"T. Hulland, A. Su, M. Kingan","doi":"10.1177/1351010X20916120","DOIUrl":"https://doi.org/10.1177/1351010X20916120","url":null,"abstract":"This article describes an investigation into the noise levels which patients are exposed to in a general inpatient hospital ward in New Zealand. An initial noise survey was conducted over a period of nine consecutive days in order to establish the noise levels in the ward. It was identified that noise levels increased dramatically between 4:00 a.m. and 7:00 a.m. In order to identify the sources of noise during this period, three noise surveys were undertaken between 4:30 a.m. and 7:00 a.m. on typical weekdays using a microphone placed inside a shared bedroom. During the noise survey, an observer identified the noise sources and their locations for significant noise events. Noise sources were then categorised into three main groups based on the character of the source (machine, staff or patient). Staff noise was found to account for 64% of the total duration of significant noise events (29% of the number of events) which occurred during the observations compared with 20% from patients (43% of the number of events) and 16% from machines (28% of the number of events). It was found that many staff and machine noise events could be mitigated or eliminated. Methods for mitigating noise are suggested and an experimental method was used to estimate the likely reduction in noise which could be attained by moving a staff conversation from the corridor outside the observed bedroom to other locations on the ward.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"27 1","pages":"299 - 309"},"PeriodicalIF":1.7,"publicationDate":"2020-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X20916120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43890824","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 : 2020-04-27DOI: 10.1177/1351010X20912938
A. Pawlik, S. Frąckowiak, K. Leluk
In this work, a number of tests were carried out to evaluate the effectiveness of the vibro-acoustic behavior composite consisting of a biodegradable polymer matrix (polylactid acid) and a filler in the form of natural flax fibers, with a moisture content of 2.03% after drying in 80°C for 4 h. To improve material dampening properties, polylactid acid was plasticized with polyethylene glycol 400 and triethyl citrate. The flax fiber content of the composite was 10, 20, and 30 wt%. Mechanical properties at bending and tensile were performed. For the measurement of vibro-acoustic suppression effectiveness, composite samples have been made to enable installation in the measurement system. The measuring system consisted of an unbalanced axial electric motor, resting on a steel frame placed on vibration suppressor. For comparison, the commercial grade vibration suppressor was used. In order to evaluate the vibration damping of the system by vibration suppressor, vibration engine frame vibration was forced by acceleration of the engine’s rotational speed to specific frequencies. It has been proven that the type of the plasticizer used in the composite changes the vibro-acoustic suppression parameter. Also, the length and the weight percentage of the fibers result in lower material damping values.
{"title":"The effectiveness of fiber-reinforced natural composites compared to the elastomer materials produced from nonrenewable resources in vibration transmission suppression","authors":"A. Pawlik, S. Frąckowiak, K. Leluk","doi":"10.1177/1351010X20912938","DOIUrl":"https://doi.org/10.1177/1351010X20912938","url":null,"abstract":"In this work, a number of tests were carried out to evaluate the effectiveness of the vibro-acoustic behavior composite consisting of a biodegradable polymer matrix (polylactid acid) and a filler in the form of natural flax fibers, with a moisture content of 2.03% after drying in 80°C for 4 h. To improve material dampening properties, polylactid acid was plasticized with polyethylene glycol 400 and triethyl citrate. The flax fiber content of the composite was 10, 20, and 30 wt%. Mechanical properties at bending and tensile were performed. For the measurement of vibro-acoustic suppression effectiveness, composite samples have been made to enable installation in the measurement system. The measuring system consisted of an unbalanced axial electric motor, resting on a steel frame placed on vibration suppressor. For comparison, the commercial grade vibration suppressor was used. In order to evaluate the vibration damping of the system by vibration suppressor, vibration engine frame vibration was forced by acceleration of the engine’s rotational speed to specific frequencies. It has been proven that the type of the plasticizer used in the composite changes the vibro-acoustic suppression parameter. Also, the length and the weight percentage of the fibers result in lower material damping values.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"27 1","pages":"357 - 366"},"PeriodicalIF":1.7,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X20912938","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42555260","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 : 2020-04-17DOI: 10.1177/1351010X20914237
Hui-Min Xie, Bingzhi Zhong, Chang Liu
Recent studies have investigated sound environment in nursing homes. However, there has been little research on the sound environment of nursing units. This research sought to address this gap. Subjective evaluations were gathered using questionnaire surveys of 75 elderly residents and 30 nursing staff members in five nursing units of five nursing homes in Chongqing, China. Background noise level and reverberation time were measured in five empty bedrooms, five occupied bedrooms and five occupied nursing station areas, in five nursing units. The subjective evaluation results indicate that the residents stay in the nursing units for most of their waking hours. The residents and nursing staff had strong preferences for natural sounds, with the lowest perceptions of these in the nursing units. The background noise level in all the occupied bedrooms exceeded Chinese standards for waking and sleeping hours. Only 20% of the occupied nursing station areas were below the allowable noise level for recreation and fitness room during sleeping hours. The nursing station area was identified as the main source of noise in the unit during waking hours. The average background noise level of the occupied bedrooms was 3–12 dBA higher than that of the empty bedrooms during sleeping hours. Attention should be given to the implementation of noise specifications for sleeping hours. The reverberation time of the bedrooms was within the range of 0.44–0.68 s, and in the nursing station areas it was 0.63–1.54 s.
{"title":"Sound environment quality in nursing units in Chinese nursing homes: A pilot study","authors":"Hui-Min Xie, Bingzhi Zhong, Chang Liu","doi":"10.1177/1351010X20914237","DOIUrl":"https://doi.org/10.1177/1351010X20914237","url":null,"abstract":"Recent studies have investigated sound environment in nursing homes. However, there has been little research on the sound environment of nursing units. This research sought to address this gap. Subjective evaluations were gathered using questionnaire surveys of 75 elderly residents and 30 nursing staff members in five nursing units of five nursing homes in Chongqing, China. Background noise level and reverberation time were measured in five empty bedrooms, five occupied bedrooms and five occupied nursing station areas, in five nursing units. The subjective evaluation results indicate that the residents stay in the nursing units for most of their waking hours. The residents and nursing staff had strong preferences for natural sounds, with the lowest perceptions of these in the nursing units. The background noise level in all the occupied bedrooms exceeded Chinese standards for waking and sleeping hours. Only 20% of the occupied nursing station areas were below the allowable noise level for recreation and fitness room during sleeping hours. The nursing station area was identified as the main source of noise in the unit during waking hours. The average background noise level of the occupied bedrooms was 3–12 dBA higher than that of the empty bedrooms during sleeping hours. Attention should be given to the implementation of noise specifications for sleeping hours. The reverberation time of the bedrooms was within the range of 0.44–0.68 s, and in the nursing station areas it was 0.63–1.54 s.","PeriodicalId":51841,"journal":{"name":"BUILDING ACOUSTICS","volume":"27 1","pages":"283 - 298"},"PeriodicalIF":1.7,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1351010X20914237","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44902041","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 : 2020-04-10DOI: 10.1177/1351010x20920959
F. Asdrubali
It was exactly three years ago – in March 2017 – when I wrote the Editorial “New challenges in Building Acoustics”, officially my first Editorial after having taken the position of Editor in Chief of the Journal at the end of 2016. It is a great honour to serve as Editor in Chief of such a “historical” international journal, being published since the early 90’s, the only one specifically devoted to acoustical aspects of buildings and for this reason I tried to do my best to improve the impact and visibility of Building Acoustics. Since then, the Journal has experienced a constant growth as far as submissions and has confirmed its reputation in the international context as the main publishing option for authors writing on building acoustics and related topics. I would like to thank SAGE, one of the most important publishing companies in the world, for the continuous and professional support and the whole Editorial Board of the Journal, which has been enriched in these years with new members from different countries. Building Acoustics can now count on 21 members: they are all recognized leading scientists, covering different geographic areas and all the research fields of building acoustics, including two Associate Editors, Micheal Kingan and Louena Shtrepi. In particular, Louena, who has just joined the Board, is a young and brilliant researcher in the field of room acoustics and I am sure that her contribution will be valuable. Some figures can be useful to understand the growth of the Journal. The submitted papers have passed from 33 of 2016 to 104 of 2019, with authors from more than 20 different countries. Every issue has been regularly published, while in previous years some issues were coupled because of a lack of papers. The number of “online first” papers, which are queuing before being published, has increased. The number of visits has increased of about 30% and the number of page views of about 20% in the period 2017-2019. The three most downloaded papers of all times belong to the same period. Various Special Issues have also characterized these recent years A first Special Issue was dedicated in 2018 to Soundscapes of buildings and built environments. The term soundscape has been defined by the ISO 12913 standard as “[the] acoustic environment as perceived or experienced and/or understood by a person or people, in context”. In recent years researchers and practitioners have shown an increasing interest for the assessment and management of both outdoor and indoor acoustic environment from a perceptual point of view. While much soundscape research has been conducted at a relatively large urban scale (e.g., urban parks, residential districts), the concept also applies to smaller contexts, such as streets, buildings or indoor public spaces. Submissions were related to soundscapes of indoor spaces, soundscape assessment and design for large buildings, acoustic comfort in public buildings (e.g., public libraries, museums, shopping malls, pu
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