Building Acoustics

This study examines 22 peer-reviewed papers to offer insights into the current utilization of psycho-acoustic sound quality metrics in research focused on indoor soundscapes. The selection of papers followed the PRISMA method for systematic review, followed by descriptive and bibliometric analyses. The review focuses on (i) identifying what psycho-acoustic indicators can be utilized to obtain an objective soundscape assessment, and (ii) determining if soundscape descriptors vary with the desired activities within the indoor space. The findings provide an overview of how psycho-acoustic sound quality metrics are used to predict perceived annoyance in indoor environments. The discussion delves into response variables related to occupants’ sound perception across various indoor settings. It highlights the lack of sufficient research on prediction models based on psycho-acoustic sound quality metrics within indoor soundscapes. Further research is required to develop tools enabling the optimal design of indoor soundscapes, which can vary according to the intended use of the room.

Md Robiul Hossain

Manish Manohare

Eoin A King

Systematic review of indoor soundscape assessments: Activity-based psycho-acoustics analysis

室内声景评估的系统综述：基于活动的声学心理学分析

In this work, the influence of the modulus of elasticity, the loss factor and the density of reinforced concrete on the vibration transmission index ([Formula: see text]) of a reduced concrete bench was evaluated. An experimental modal analysis based on the Operating Deflection Shape (ODS) methodology is carried out on a reinforced concrete slab (1.20 × 0.80 × 0.20 m) supported on four concrete pillars, applying four sources of distinct impacts: mallets of 1 and 4 kg, impact machine and one person jumping. The experimental results served to validate the finite element bench model (FEM) considering both the first four modes of slab vibration and the adjustment of the elasticity and shear modulus, the loss factor and the density of the concrete using the NSGA genetic algorithm-II. The [Formula: see text] index between the slab and the columns was determined experimentally, numerically and analytically, according to the Gerretsen model. The FEM model showed a percentage difference in the frequencies of the vibration modes less than 10% concerning the tests for the [Formula: see text] index. The influence of density and the modulus of elasticity mainly in the direction perpendicular to the plane of the structure modify the values of the frequencies of the vibration modes by up to 10% without interfering in the modal forms of the structure. In addition, the internal loss factor alters the amplitude of the [Formula: see text] results by an average of 10 dB. Finally, it is shown that the stiffness varies according to the orthotropy of the material. It was possible to conclude that the computational model showed good convergence in results ([Formula: see text]%) when compared with the [Formula: see text] experiments, with the same varying along the frequency, different from what is proposed in the analytical and normative models. This fact proves the hypothesis raised that structural couplings in practice generate significant interference in the results, as happens in residential buildings, with the test bench being an important experiment for initial predictions with little interference from energy transmission to the environment.

Wagner de Sousa Santos

Erasmo F Vergara

Gildean do Nascimento Almeida

Influence of the variation of concrete properties in determining the vibration transmission index <i>Kij</i>

混凝土性能变化对振动传递指数Kij确定的影响

The acoustic comfort and environmental concerns in the building sector are two interconnected and crucial aspects for the sustainable development of the construction industry. This study investigates the acoustic absorption properties of plasterboards reinforced with woven fabric made from Moroccan sisal fiber. Three different weave designs, Basket 2-2, 2/2 Twill, and 4-Harness Satin, were produced using a conventional weaving process. Plasterboards were manually fabricated by varying the number of fabric layers (one, two, or three) and employing a water/plaster ratio of 0.7. The acoustic performance of the plasterboards was evaluated using an impedance tube according to ISO 10534-2. The results demonstrated that the plasterboards reinforced with the Basket 2-2 weave achieved the highest sound absorption coefficient, reaching 0.39 at 1700 Hz with three layers, significantly higher than pure plasterboards, which exhibited a maximum coefficient of 0.05. The study also employed support vector regression (SVR) models to predict the sound absorption coefficient, with the linear SVM model achieving the best predictive accuracy (R² = 0.88, RMSE = 0.024). These findings underscore the potential of Moroccan sisal fiber as an eco-friendly reinforcement for improving the acoustic absorption of plasterboards.

Zineb Samouh

Hafida Er-Rradi

Rachida Idchabani

Abdelilah Jilbab

Chakib Bojji

Acoustic absorption characterization and modeling using support vector regression of plasterboards reinforced with woven Moroccan sisal fiber

石膏板增强摩洛哥剑麻纤维的声吸收特性与支持向量回归建模

The ancient theatre of Taormina is considered one of the most beautiful attractions of this town. Built on top of a cliff over the Mediterranean Sea, the spectators remain captured by the suggestions that this performance arts space can still inspire. Finished to be erected in the 3rd century BC, the theatre in Hellenistic period was provided with a small temple on the top centre of the cavea. Modified by Romans based on their requirements for spectacles, the organization of this ancient theatre was amplified with the creation of a double porticus supported by a columnade, and with the extension of the scenic building. After its desuse, some construction elements of the theatre were utilized to build new structures in town, provoking significant damage to the original shape. The spectacles that nowadays are conducted within the ancient theatre are many, executed especially over summer seasons. Acoustic measurements have been carried out inside the theatre to understand the acoustic response of the existing conditions. Starting from this scenario, the values of the main acoustic parameters have been compared with the digital reconstruction of the building at the Greek and Roman period. This research study highlights the difference in the acoustic response between these two scenarios and the existing conditions, and how the acoustics during the Roman period was the most suitable for musical performances.

A. Bevilacqua

G. Iannace

F. Giuri

I. Ferrari

Through the history of the acoustic response within the theatre of Taormina: From Greek and Roman periods to our days

通过陶尔米纳剧院声学响应的历史：从希腊和罗马时期到今天

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.

Jörgen Olsson

Andreas Linderholt

Low-frequency impact sound of timber floors: A finite element–based study of conceptual designs

木地板低频撞击声：基于有限元的概念设计研究

Preschool is an important time for children to grow in their experiences, abilities, and knowledge before entering formal school. Therefore, it is vital that the classroom acoustic environment supports children’s listening, learning, and wellbeing. The aim of this scoping review was to determine what is known from the literature about the effect of classroom acoustics and noise on preschool children’s listening, learning, and wellbeing, and what the knowledge gaps are. The scoping review followed the PRISMA-ScR guidelines. Seven papers met the criteria to be included in the review. The findings suggest that poor classroom acoustic conditions and particularly high noise levels, can have a negative effect on preschool school children’s listening and wellbeing, but may not affect word learning at the SNRs investigated. Nevertheless, it would be beneficial to install acoustic solutions and manage noise in preschool classrooms to enhance children’s listening, learning, and wellbeing. Future research avenues are discussed.

Kiri Mealings

Joerg M Buchholz

The effect of classroom acoustics and noise on preschool children’s listening, learning, and wellbeing: A scoping review

教室声学和噪音对学龄前儿童听力、学习和福祉的影响：范围综述

Abbreviation	Build. Acoust.
Journal Impact	1.26
Quartiles(Global)	ACOUSTICS(Q3)

ISSN	1351-010X, 2059-8025
h-index	30

Publication Information	Publisher: SAGE Publications Inc.，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 1997，Proportion of original research papers: 81.82%，Self Citation Rate:14.30%， Gold OA Rate: 23.81%

Building Acoustics

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Systematic review of indoor soundscape assessments: Activity-based psycho-acoustics analysis

Influence of the variation of concrete properties in determining the vibration transmission index Kij

Acoustic absorption characterization and modeling using support vector regression of plasterboards reinforced with woven Moroccan sisal fiber

Through the history of the acoustic response within the theatre of Taormina: From Greek and Roman periods to our days

Low-frequency impact sound of timber floors: A finite element–based study of conceptual designs

Acoustic absorption characterization and modeling using support vector regression of plasterboards reinforced with woven Moroccan sisal fiber

Influence of the variation of concrete properties in determining the vibration transmission index Kij

Systematic review of indoor soundscape assessments: Activity-based psycho-acoustics analysis

Through the history of the acoustic response within the theatre of Taormina: From Greek and Roman periods to our days

The effect of classroom acoustics and noise on preschool children’s listening, learning, and wellbeing: A scoping review