Article
Multidisciplinary Sciences
Shuping Wang, Jiancheng Tao, Xiaojun Qiu, Ian S. Burnett
Summary: This study found that staggered windows outperform traditional single-glazed windows in noise reduction at mid to high frequencies while allowing for natural ventilation. To achieve noise attenuation in the low frequency range, a novel coiled-up silencer design with coupled tubes is proposed, showing improved noise reduction capability across a wider spectrum.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Paper & Wood
Chun-Won Kang, Kazuharu Hashitsume, Eun-Suk Jang
Summary: This study investigates the sound-absorbing performance of coffee grounds as an eco-friendly sound-absorbing material. The results show that as the density and thickness of the coffee grounds increase, the sound absorption coefficient improves at low frequencies but decreases at high frequencies. The optimal noise reduction coefficient (NRC) of coffee grounds investigated in this study is 0.61 at a density of 0.3 g/cm3 and thickness of 50 mm, which is comparable to other natural sound-absorbing materials.
Article
Chemistry, Physical
Sigitas Vejelis, Saulius Vaitkus, Arunas Kremensas, Agne Kairyte, Jurga Seputyte-Jucike
Summary: Textile waste is generated in various stages of production and can be recycled to produce new products. This study focuses on making acoustic boards using waste from the production of woollen yarns. It was found that around 74% of the waste is suitable for making acoustic boards. The boards made from the waste have similar acoustic characteristics to traditional boards or sound insulation products made from renewable resources.
Article
Mechanics
Mohammad Reza Khosravani, Tamara Reinicke
Summary: This study investigates the technical efficiency of a Multilayer Perforated Sound Absorber (MPSA) made of 3D-printed perforated panels using vat photopolymerization method, and evaluates its sound absorption performance using an impedance tube. Results show that the perforation ratio and air gap significantly affect the resonant frequency of the maximum sound absorption coefficient.3D-printed perforated panels demonstrate high performance in sound absorption.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Hyeon Jun Choi, Jung Hyeun Kim
Summary: By designing the cellular morphology of polyurethane foam, various sound absorption effects can be achieved by controlling the porosity and cavity size.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Manufacturing
William Johnston, Bhisham Sharma
Summary: This study investigates the additive manufacturing of fibrous sound absorbers using fused deposition modeling, proposing two methods for 3D printing fibers and analyzing the effects of printing parameters on fiber characteristics and sound absorption coefficient. Experimental studies support an analytical model to understand the impact of fiber parameters on acoustical transport parameters, revealing distinct characteristics of fibers produced by different methods with potential for new routes towards fiber-enhanced multifunctional structures.
ADDITIVE MANUFACTURING
(2021)
Article
Acoustics
Xuewen Liu, Xinzhong Xiong, Jinxiang Pang, Liang Wu, Heavy Zhang
Summary: This paper investigates the acoustical performance of sound-absorb cotton, comparing experimental and model results to find the most suitable acoustical model and exploring the impact of airflow resistivity on the sound absorption coefficient. The findings help to determine the best theoretical model for sound-absorb cotton.
Article
Chemistry, Physical
Maria Violeta Guiman, Mariana Domnica Stanciu, Ioan Calin Rosca, Sergiu Valeriu Georgescu, Silviu Marian Nastac, Mihaela Campean
Summary: The study aims to analyze the impact of wood quality class and orthotropy on the sound absorption coefficient, reflection, and impedance ratio of spruce and maple, two commonly used wood species for stringed musical instruments. An impedance tube was used for experimental measurements in the frequency range of 100-6400 Hz. The study also determined the influence of porosity and tortuosity on acoustic absorption and the maximum values of acoustic absorption coefficients. The results highlight the differences in wood quality class and sound direction within each species and provide useful information for musical instrument manufacturers and more.
Article
Acoustics
Kesheng Zhang, Yi Ding, Xiangqun Zhang, Yi Hu
Summary: This study proposes a method to synthesize the frequency-dependent sound relaxational absorption, which can be used for gas detection. By measuring the sound speeds at three frequencies in real-time, the accuracy and convenience of the measurement are improved. The method proves effective for gases such as CH4, CO2, CL2, and N-2.
Article
Chemistry, Multidisciplinary
Elisa Levi, Simona Sgarbi, Edoardo Alessio Piana
Summary: This study highlights the importance of investigating the acoustic characterization of steelwork by-products from a circular economy perspective. By using an inverse technique based on the Johnson-Champoux-Allard model, non-acoustic physical properties can be derived, providing a foundation for the acoustic optimization of porous materials. The results obtained are consistent with literature data and show the potential for these by-products to become valuable alternatives for noise control applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Przemyslaw Mania, Artur Flach, Marta Pilarska
Summary: This study analyzes the absorption coefficient and speed of sound propagation in thermally modified wood. It finds that while the broad physical properties of this material, such as high resistance to weathering and fungi, and better dimensional stability, are well known, there is a lack of analyses on its acoustic characteristics. Pine wood showed the most rapid increase in sound absorption coefficient, reaching the highest value among all wood species. The highest value of the examined parameter was obtained for beech wood and pine wood, which were 0.213 (at frequency 3 kHz) and 0.183 (at 6.3 kHz), respectively. The sound velocity decreased only in the tangential direction for all species.
APPLIED SCIENCES-BASEL
(2023)
Article
Acoustics
Mostafa Sabbagh, Ahmed Elkhateeb
Summary: This study investigated the sound absorption characteristics of human body during Islamic prayer postures, finding that the body can absorb sound waves in the mid- and high-frequency bands with absorption depending on body posture. Results showed that standing in well-defined rows yielded the highest equivalent sound absorption area per object, while prostration yielded the lowest. The study also revealed the effects of clothing and carpets on sound absorption by the human body.
Article
Materials Science, Multidisciplinary
Wenhao Sun, Baorui Pan, Xiang Song, Heye Xiao, Jie Zhou, Dan Sui
Summary: This study focuses on the design, prediction, and validation of a novel composite sound absorber similar to the feather surface structure of barn owls. It demonstrates that a nanofibrous membrane can effectively enhance the acoustic performance of porous materials and provides a suitable thickness range for improving sound absorption coefficient.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Hongjia Zhang, Yang Wang, Keyu Lu, Honggang Zhao, Dianlong Yu, Jihong Wen
Summary: SAP-net, based on deep convolutional neural network, provides a fast and accurate approach for predicting the sound absorption coefficient of metaporous materials. It demonstrates outstanding evaluation speed and brilliant prediction accuracy, showing the capability of learning and capturing the underlying physical mechanism linking the topological structure to the sound absorption performance.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Paper & Wood
Eun-Suk Jang, Chun-Won Kang
Summary: This study investigates the difference in sound-absorbing capabilities of thermally modified wood at different temperatures and anatomical directions. The results show that with increasing treatment temperature, the sound absorption capability in the radial plane and transverse section both increase. However, at 230℃, the sound absorption effect in the radial plane becomes negligible. Therefore, thermally modified wood can be expected to effectively absorb sound when used as a transverse section.
Article
Engineering, Mechanical
D. Bitar, A. Ture Savadkoohi, C-H Lamarque, E. Gourdon, M. Collet
NONLINEAR DYNAMICS
(2020)
Article
Construction & Building Technology
Clement Piegay, Philippe Gle, Emmanuel Gourdon, Etienne Gourlay
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Review
Energy & Fuels
Lubomir Klimes, Pavel Charvat, Mahmood Mastani Joybari, Martin Zalesak, Fariborz Haghighat, Karthik Panchabikesan, Mohamed El Mankibi, Yanping Yuan
Article
Acoustics
Luc Jaouen, Emmanuel Gourdon, Philippe Gle
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2020)
Article
Construction & Building Technology
Mohamed Said Abbas, Emmanuel Gourdon, Philippe Gle, Fionn McGregor, Mohammed Yacine Ferroukhi, Antonin Fabbri
Summary: This article investigates the relationships between hygrothermal and acoustical parameters of bio-based porous materials, providing a method for indirect characterization of material properties through acoustical measurements. By estimating thermal conductivity and water vapor permeability from acoustical measurements, the study aims to accelerate the development of sustainable construction materials and better understand the complex hygrothermal behavior of such materials.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Gabriel Remion, Bassam Moujalled, Mohamed El Mankibi
Summary: The measurement of natural airflows in multi-zone passive-stack ventilated dwellings is challenging. A new protocol based on the Kalman filter and a concentration correction procedure was proposed to address this issue. The results of laboratory testing showed that the new protocol was more accurate and less sensitive compared to the traditional 2-points decay method.
BUILDING AND ENVIRONMENT
(2021)
Article
Thermodynamics
Karthik Panchabikesan, Fariborz Haghighat, Mohamed El Mankibi
Summary: Occupant schedules and energy-use behavior are crucial inputs for building energy simulations and management. This study proposes a data-driven framework for extracting distinct occupant schedules in residential buildings and develops linear and logistic regression models to represent occupant activity level and presence/absence state. The research demonstrates different occupant patterns in buildings and shows better prediction results for lighting and plug load consumption data in terms of energy usage.
Article
Acoustics
U. Arasan, F. Marchetti, F. Chevillotte, G. Tanner, D. Chronopoulos, E. Gourdon
Summary: Various vibro-acoustic models for single wall or multi-layer constructions are established based on classical plate and shear deformation theories. Analytical expressions for the frequency limit of thin and thick plate theories are derived for an elastic layer of isotropic material from the analyses of wavenumbers and admittances. Validation of these frequency limits is made by comparing transmission loss obtained from both plate theories with elasticity theory.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Acoustics
Clement Piegay, Philippe Gle, Etienne Gourlay, Emmanuel Gourdon, Sandrine Marceau
Summary: Vegetal wools can store atmospheric carbon dioxide and are essential for green buildings. They also have high sound absorption level performances for indoor spaces. A micro-macro homogenization approach based on cylindrical geometry is used to model their sound absorption properties.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Acoustics
U. Arasan, F. Marchetti, F. Chevillotte, L. Jaouen, D. Chronopoulos, E. Gourdon
Summary: Multi-layered partitions and sandwich composites are commonly used in various industries to enhance sound comfort, noise attenuation, and improve bending rigidity. Automotive, aerospace, and civil industries utilize these structures passively to reduce structure-borne noise, while constrained layers are applied to improve the damping response of vibrating systems.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Construction & Building Technology
Philippe Gle, Gaudrey Massossa-Telo, Arthur Hellouin de Menibus, Matthias Degrave-Lemeurs, Emmanuel Gourdon
Summary: This study demonstrates that the acoustic performance of light earth walls can be satisfactorily predicted using the Transfer Matrix Method computation. Additionally, it provides a good understanding of the physical phenomena occurring in biobased concretes and their relationship with the presence of coatings.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Mechanics
A. Labetoulle, A. Ture Savadkoohi, E. Gourdon
Summary: This study investigates the vibratory energy transfer between a linear and a nonlinear oscillator at different time scales. The nonlinear system is characterized by a time-dependent periodic restoring forcing function. By detecting the dynamics of the system at fast and slow time scales, different dynamical characteristics are revealed, including slow invariant manifold, equilibrium points, and singularities. The study demonstrates that the time-dependent nonlinearity affects the phase-dependent slow invariant manifold, frequency responses, and the stability borders of the slow invariant manifold and singularities zones. The presence of backbone curves and isolas in the system is also identified, which should be carefully considered for system control purposes.
Article
Acoustics
Camila Elizabeth da Silveira Zanin, Aurelie Labetoulle, Emanuele De Bono, Emmanuel Gourdon, Manuel Collet, Alireza Ture Savadkoohi
Summary: This article studies a two degrees-of-freedom system that couples the acoustical mode of a closed tube to an electroacoustic loudspeaker. A model-inversion technique is proposed to digitally program the loudspeaker's impedance for achieving a desired nonlinear behavior. Experimental results demonstrate that the programmed nonlinearity can guide the system to exhibit both periodic and non-periodic responses with lower acoustical activation levels compared to systems with passive nonlinear oscillators, making it suitable for building applications. Furthermore, it is observed that the programmed nonlinearity of the electroacoustic loudspeaker, even in its non-optimized form, can perform nonlinear noise control in certain frequency ranges.
BUILDING ACOUSTICS
(2023)
Article
Construction & Building Technology
Hajar Benhmidou, Zaid Romani, Mohamed El Mankibi, Abdeslam Draoui
Summary: This study focused on representing the energy state of an existing building in Morocco using in-situ measurements. Infrared thermography was used for thermal diagnosis and TRNSYS software for energy modeling. A comparative study was conducted on different scenarios of the building to analyze cooling and heating energy needs with and without a concrete frame.
ADVANCES IN BUILDING ENERGY RESEARCH
(2021)
Article
Acoustics
Emmanuel Gourdon, Alireza Ture Savadkoohi, Bertrand Cauvin
BUILDING ACOUSTICS
(2020)
