bluuebunny/crossref_metadata_2025 huggingface dataset:
Localization of correlated moving sources from numerical flyover scenarios
Authors: DEMONTIS Hugo , JULLIARD Emmanuel
Published: October 2024

The noise emissions during flyover test can be analyzed with a phased microphone array placed on the ground. If the flight path is known, an acoustic imaging technique is then used to map the sound pressure over the fuselage, in order to locate the most emergent aeroacoustic sources.
Most of the dedicated array techniques assume a spatial distribution of uncorrelated equivalent sources to be sought. This paper deals with the localization of correlated moving sources, and demonstrates the effectiveness of an uncorrelated-based deconvolution technique for this purpose. The
technique is applied on synthetic data from three different numerical scenarios, including a simplistic configuration of an overflying aircraft, which involve a small number of sparse, correlated monopoles in motion.
A quarter wave infrasonic noise generator
Authors: SUBRAMANYAM Ramesh Raja , CASTRO MOTA Rafael , JACOB Stefan
Published: October 2024

The far-field prediction of infrasonic noise, e.g. from large emitters such as wind turbines, requires precise measurement of the sources. A method to determine the source power based on near-field holography techniques are currently under development in our group. However, tuning the
method requires a calibrated infrasound source. In this work, we present the concept of a traceable loudspeaker driven infrasound source using the quarter wave resonator principle in a pipe. The power emitted by the source is measured in situ based on the two-port theory. The infrasonic frequencies
can be tuned by adjusting the length of the resonator pipe. Results of the free-field measurements at multiple points at varying distances away from the source are presented. The results suggest that the infrasonic source can be used as a calibrated reference for method development and validation.
NVH multiobjective and robust optimization of electric motor design, including power losses
Authors: PARPINEL Adrien , BOUVET Pascal , DUPONT Jean-Baptiste
Published: October 2024

As part of electric motor design, compromises between NVH considerations, electrotechnical design and performance targets must be made. Electromagnetic excitation within the airgap results in structure-borne and airborne noise transmission to the vehicle. High-frequency tones are characteristic
of this noise. Efficient computation methods exist to estimate these vibration and noise levels. From the early design stage, NVH performance can be diagnosed and optimized. The focus on NVH can no longer be separated from efficiency optimization. Simulation workflows and optimization loops,
developed for NVH-related targets, are updated to consider copper and iron losses. The modification of the geometrical design must be addressed to reduce both dynamic excitation and energy loss, or at least offer compromises. Electric motor design optimization requires the handling of multiple
objectives and constraints from multiple physics. In addition, design robustness must be ensured as part of the industrial process: manufacturing tolerances have to be considered to define a robust optimized design.
A novel numerical method for solving the Kirchhoff-Helmholtz integral equation based on the sound field representation using the reproducing kernel in the frequency domain
Authors: INOUE Naohisa , IWAMI Takahiro , OMOTO Akira
Published: October 2024

The paper introduces a unique numerical solution method for the Kirchhoff-Helmholtz integral equation. This method is based on the representation of the sound field using the reproducing kernel in the solution space of the homogeneous Helmholtz equation. When compared to the conventional
boundary element method, the proposed method holds numerous advantages. This paper presents the analysis theory of the proposed method and demonstrates its validity by calculating bounded and unbounded sound fields. The accuracy of the calculation is assessed by computing the sound field in
a rectangular room under various conditions. Furthermore, although some theoretical issues remain, the proposed method effectively avoids the non-uniqueness of solutions in unbounded domain problems.
Ventilation and windows in The Netherlands
Authors: BEENTJES Wim
Published: October 2024

The Dutch Building decree gives rules for the ventilation and sound insulation of facades. In the standards a lot of possibilities are described to fulfil these requirements. In this paper the most frequently used methods are described. It also became clear that in the course of the
last 40 years some methods for natural ventilation are not in use any more for newbuilt dwellings because of problems with insect-nuisance and housebreaking. Therefore special ventilation grids and muffles are in use to fulfil the requirements both for ventilation and sound insulation of facades.
In that case open windows play no role in case of ventilation but only when people want to get fresh air in a short time by opening windows on both sides of the dwelling. In that case there are no requirements for sound insulation of facades. In this paper the fulfilling of the sound insulation
of facades and ventilation are described .
Wall-applicable metamaterial: mitigating resonance dip for enhanced sound transmission loss
Authors: ZENG Rui , DECKERS Elke , GLORIEUX Christ , URBáN Daniel , CHMIELEWSKI Bartosz
Published: October 2024

In recent years, there has been a significant advancement in thermal insulation technology, allowing for the implementation of energy-efficient solutions in existing buildings while preserving their architectural and cultural significance. This recognition has led to the widespread
adoption of External Thermal Insulation Composite Systems (ETICS). However, this brings the common challenge in acoustic engineering, the resonance dip, into the spotlight. When the frequency of an incident sound wave coincides with a mass-spring-mass resonance of the thermally insulated wall,
the sound insulation drop occurs, possibly resulting in a reduction in transmission losses. This study introduces a wall-applicable design of Plate-type Acoustic Metamaterial (PAM) to effectively enhance sound transmission loss. We investigated in development a transfer matrix method combined
with the effective mass density of PAM to model the ideal metamaterial wall and further compared it with the results based on mass-law methods. Design strategies to construct the ideal bandgap were developed by analyzing dispersion curves.
Moving sound source localization in 3D space based on time delay and energy ratio technique
Authors: THAKUR Shikha , SINGH Sneha
Published: October 2024

Moving sound source localization has numerous applications in interdisciplinary realms such as in teleconferencing, in defense, in robotics, and fault localization in vehicles. Localization of moving source is more challenging than localizing stationary sources because the motion disturbs
the sound field and manipulates the frequency and amplitude of the acoustic pressure at recording location, which hampers the accuracy of source localization. Existing moving source localization techniques have numerous restrictions such as source trajectory should be known beforehand as a
straight line perpendicular to the array geometry, source should be in same plane or parallel to the microphone array plane, and source velocity should be known. Moreover, when the source elevation is high, these techniques give high error. This study proposes the time delay and energy ratio
based real-time moving sound source localization technique that is free from above-mentioned restrictions and can track the source's 3D coordinates accurately. Six microphones are used to localize a moving source by processing the time delay and energy ratios between sensor pairs. The root
mean square error found for low source speed and high source speed conditions are 0.73 m and 1.8 m respectively.
One-third octave spectrum calculation to meet the attenuation limits of a Class 1 analyzer (IEC 61260-1:2014) for low-power noise sensors
Authors: QUINTERO PEREZ Guillermo , BALASTEGUI Andreu , ROMEU Jordi
Published: October 2024

Thanks to the advances in technology and the cost reductions of electronic components, nowadays it is possible to produce low-cost and low-power acoustic sensors with extended capabilities such as the one-third octave band spectrum calculation. However, there are some doubts about the
accuracy of these devices. Thus, to meet the attenuation limits of a Class 1 analyzer for low frequencies as stated in IEC 61260-1:2014 normative, this research proposes two algorithms to calculate the one-third octave band spectrum, both algorithms are based on the Power Spectral Density
(PSD). The first one consists of a subdivision of frequency bins, where a PSD bin is divided into smaller parts, gain adjusted, and assigned to its corresponding one third-octave band. The other one is based on signal decimation-accumulation, where samples, that are processed every 125 ms
due to the sensor design, are first decimated and then accumulated to increase the frequency bin resolution. Both algorithms are programmed into the sensor and the power consumption and acoustical performance are evaluated and compared to a typical multi-rate filter bank. It is observed that
both proposed algorithms improve the performance of the low-cost sensor in terms of energy consumption and accuracy.
CNOSSOS-FR: Are current road traffic noise emission coefficients still representative of today's vehicle fleet and roads?
Authors: PALLAS Marie-Agnès , LE BELLEC Adrien , ECOTIèRE David , CHIAPPINI Fabien , LITOU Guillaume , DUNEZ Philippe , POT Geoffrey
Published: October 2024

CNOSSOS-EU is the common noise prediction method for producing strategic noise maps in Europe, according to Directive 2002/49/CE. Its road vehicle noise emission model involves a propulsion noise component and a rolling noise component, with coefficients specific to each vehicle category.
As currently applied in France, it relies on the original EU coefficients published in the 2015 CNOSSOS-EU version and the rolling noise contribution is detailed in road surface classes in agreement with the national NMPB2008 method. As provided in the European method, corrective coefficients
in frequency bands were determined per road surface class. The objective was to minimise the overall difference between NMPB2008 and CNOSSOS-FR emission predictions under similar conditions, the former method being previously used for periodic mapping. Now considering the later release of
new EU reference coefficients and the difficulty of making the two methods involving different expressions and assumptions coincide, as well as questioning the need to update emission values resulting from measurements of the vehicle fleet taken 20-25 years ago, the study MINOOS is being carried
out to assess the noise emission of the current vehicle fleet and reconsider French prediction coefficients accordingly. The paper describes the procedure and presents the first results.
Innovative silencer for window air inlets
Authors: BOULVERT Jean
Published: October 2024

This presentation introduces an innovative window air inlets silencer. The product is intended for exterior installation, tailored to match the standard dimensions of window air inlets, specifically the slot through the window. It is designed to complement internal window air inlet
equipment. The silencer's design encompasses multiple functionalities. The main one is reducing external noise transmission (such as traffic, airport, and city center noise) from outside to inside the room equipped with the air inlet. Additionally, it minimally impacts air flow, ensures resistance
to water and sunlight, offers washability for accumulated dust, and emphasizes aesthetics compared to other existing silencers. The development of the silencer involves a comprehensive approach, incorporating numerical simulations, optimizations, prototypes, and standard experimental tests.
The performance of the developed silencer is compared with similar products already available in the market.
Elevated noise sources in the European noise prediction model
Authors: MALY Thomas , KASESS Christian H. , KIRISITS Christian
Published: October 2024

The prediction model of the Environmental noise directive 2002/49/EC was transposed into Austrian national regulations in 2021 and 2022. In comparison to the Austrian prediction model defined in ONR 305011, which was last updated in 2009, it allows far more acoustic details to be taken
into account enabling a more realistic description of noise emissions and propagation than before. For instance, an additional, elevated noise source position is used to model traction noise of aggregates or fans at the upper part of locomotives or motor coaches and aerodynamic noise caused
by pantographs at high speeds. For free sound propagation the effect of split source positions is usually negligible, while in case of noise barriers the elevated source position lowers the insertion loss. This article discusses this effect using exemplary calculations with the European prediction
model under various conditions (e.g. different barrier heights, and train speeds). The results emphasize the importance of accurate model input parameters describing traction and in case of high speeds aerodynamic noise for predictions, which need high accuracy.
The impact of tyre tread pattern design parameters on accelerated pass-by noise
Authors: BANGARU Bharath Sagar , MAKWANA Bharat kumar
Published: October 2024

Road-Traffic noise is one of the major environmental issues globally. Considering its effects on human health, international standards have been developed and emission limits have been adopted. In Europe, these regulations are becoming more stringent and challenging the automotive industry.
There are two legislative Pass-by-noise test methods: Normal Pass-By-Noise (R117) for Tyre legislation and Accelerated Pass-By-Noise (R51) for vehicle legislation. For OE (Original Equipment) business meeting strict Accelerated Pass-By-Noise target is necessary for the Tyre industry because
Tyre is a major influencing factor in overall vehicle noise. This paper explores the relationship between the parameters of tyre tread pattern and their effect on accelerated pass-by noise. The investigation shows how specific characteristics of the tread pattern, such as design, groove geometry,
and other relevant factors, contribute to the overall noise generated during accelerated pass-by noise measurements.
Noise hindering sound complexity in urban environments: Towards a novel evaluation criterion for urban sustainability
Authors: TSALIGOPOULOS Aggelos , KYVELOU Stella-Sofia , CHOURMOUZIADOU Kalliopi , KARAPOSTOLI Aimilia , MATSINOS Yiannis G.
Published: October 2024

Urban environments are complex adaptive systems, wherein changes in one area can lead to unforeseen consequences in others. Environmental noise emerges as a multifaced issue influencing various receivers across different spatial and temporal scales. The perception of noise as a high-intensity
or unwanted sound has defined the concept of quietness accordingly overlooking sustainability co-benefits. This study proposes an alternative evaluation criterion for urban planning and design, focusing on the sound complexity of public spaces that are vulnerable to environmental noise fluctuations.
To determine the sensitivity of sound complexity to environmental noise, sound level measurements and sound recordings were conducted along the waterfront of a Mediterranean metropolis during the pandemic lockdowns (April 2021). Additionally, the bird dawn chorus phenomenon was studied. The
analysis of collected data revealed an inverse relationship between complexity and noise, highlighting an additional impact on the urban sound environment. The promotion of sound complexity as a strategy for livable and sustainable cities can guide urban planners and designers in developing
quiet and ecologically resilient urban environments.
Novel approaches to assessing brake squeal propensity: comparative evaluation of two index formulations
Authors: YAVUZ Akif , SEN Osman Taha
Published: October 2024

The persistence of brake squeal as a significant NVH issue within automotive brake systems necessitates the development of robust methods for assessing squeal propensity. This study introduces two novel squeal index formulations for assessment purposes and evaluates their performance
against the formulation defined by the SAE J2521 standard. Experimental data essential for formulating the squeal index are collected on a controlled mass-sliding belt experiment. Experiments are performed at three different spring stiffness levels, and squeal index formulations are derived
based on time and frequency domain data. The first formulation places particular emphasis on the time domain, explicitly considering the duration of individual squeal events. Conversely, the second formulation is based on the frequency response characteristics of the system, which considers
the number of super-harmonic peaks in frequency spectra. To evaluate the performance and discriminatory capabilities of the newly developed squeal index formulations, extensive comparisons are made against the Squeal Index based on the test procedure described in SAE J2521. In conclusion,
through meticulous analysis and interpretation of the experimental results, it is discerned that the squeal index formulation defined by time domain exhibits superior efficacy in discerning the nuanced effects of varying design parameters on the occurrence of squeal-like behavior.
Neural Impedance Boundary (NeIB): a neural-network based framework for acoustic surface impedance estimation utilizing sparse measurement data
Authors: XIA Yuanxin , BORREL-JENSEN Nikolas , ENGSIG-KARUP Allan P. , JEONG CHEOL-HO
Published: October 2024

Amidst recent advancements in the 3D digital representation that have significantly enhanced the modeling of geometric attributes of pre-existing environments, accurate estimation of acoustic boundary conditions remains a complex challenge. This paper presents a novel way to determine
what we refer to as a neural boundary field, using physics-informed neural networks (PINN). The aim is to estimate the surface impedance measured in-situ by utilizing several points of sound field pressure. This approach couples the Helmholtz equation with automatic differentiation in the
PINN framework to estimate accurately the surface impedance using a hybrid modeling approach where measurement data and domain knowledge in the form of equations for the acoustic waves are combined. As a proof-of-concept, we train the neural networks using 2D sound field data obtained from
high-fidelity numerical acoustical simulations that incorporate actual surface materials parameters. We discuss the measurement techniques associated with this method and outline our vision for its application to 3D scene reconstructions in the future.
Acoustic design of an innovative classroom: the Piscopia Corner in Milan
Authors: TARDINI Virginia , FRATONI Giulia , NORA Alessia , MALATESTA Patrizia , FIORDI Roberta , CAPPELLINI Luca , TARANTINO Matteo , D'ORAZIO Dario
Published: October 2024

This paper reports on the measurements, design, and testing of a highly innovative classroom: the Piscopia Corner - Augmented Education Lab, built in the new MIND (Milano Innovation District) district in Milan, Italy. This educational space is designed to leverage connectivity, artificial
intelligence, and sensing to enhance sustainability, inclusivity, and efficacy. As key use cases of the Piscopia Corner pivot on real-time speech transcription and translation of interactions, acoustics plays a key role. Improving classroom acoustic conditions is crucial for enhancing speech
clarity, promoting student focus, and relieving teachers of vocal effort. The Italian standard UNI 11532-2:2020 states proper requirements for multimedia classrooms such as the one involved in the present case. This space aims for superior speech intelligibility, accommodating multiple speakers
and addressing the needs of individuals with hearing impairments or language barriers, with a high outward intelligibility. The Piscopia Corner is a modern classroom meeting the stringent requirements of interactive audio-video activities and inclusive principles. The treated suspended ceiling
integrated with sensor technology required a proper mix of materials to balance the sound absorption in frequency and improve speech intelligibility to achieve category A4 limits.
Accounting of imperfect interfaces in multilayer modeling
Authors: MARCHETTI Fabien , CHEVILLOTTE Fabien
Published: October 2024

Multilayer systems are widely used in industry for their performances as compared with homogeneous materials. The layers are usually glued together but the bonding may be imperfect (air bubble, detachment). The interfaces are generally modeled as sliding or bonded. These two behaviors
can be significantly different and the actual behavior is generally somewhere in between. The vibroacoustic behavior of the structure is thus modified by the imperfect interface. Several models have been implemented to describe the dynamic behavior of multilayer systems with imperfect interfaces.
In this paper, we propose an analytical model of imperfect interfaces based on the Transfer Matrix Method (TMM). Two computations are performed in parallel (one with a perfectly bonded interface and the other with a sliding interface). Instead of mixing impedances or admittances matrices,
a mixing law on the state variables is applied, resulting in an equivalent global matrix which can be coupled in any multi-layer. The model is compared in terms of the sound absorption or sound transmission loss with the existing ones and is applied on different classical multilayer systems
with multi-layered solid plates and a multilayer composed of a porous layer with a heavy layer which is widely used in the automotive industry.
Psychophysiological evaluation of life-cycle disorder restoration using VR soundscape
Authors: LEE Haram , YOON Hyowon , JEON Jin Yong , AHN Donghyun
Published: October 2024

The emotional restorativeness of soundscapes, akin to the healing effects of natural green spaces, can induce recovery from life-cycle emotional and cognitive-related disorders. A digital therapy program that supplements medication was developed through soundscape experiences in a multi-user
VR environment and evaluated psychophysiologically. Initially, the program provided natural environment-based role-playing for the treatment of children with ADHD and utilized soundscape audio-visual content for adolescents and soundwalk content as a physical activity program for emotional
care and cognitive function improvement in patients with cognitive disorders. The effectiveness of the digital therapeutic under development was verified through clinical symptom assessment tools and changes in psychological and physiological responses.
Identifying optimal feature sets for acoustic signal classification in environmental noise measurements
Authors: ARTUSO Francesco , FIDECARO Francesco , D'ALESSANDRO Francesco , IANNACE Gino , LICITRA Gaetano , POMPEI Geremia , FREDIANELLI Luca
Published: October 2024

Whatever the sound source to be evaluated, spurious events or unwanted sounds will always be present in environmental noise measurements. Spurious events are not characteristic of standard residual noise and must be removed prior to subsequent analyses. Currently, the removal step is
deferred solely to the objective evaluation of the sound pattern and/or spectrogram by an operator. This results in the loss of many man-hours. Machine learning can be used to develop a tool capable of recognizing and removing spurious events in noise measurements. The tool must be able to
account for various sounds, whether human-made or animal, and must be applicable to any environmental scenario. This is not a straightforward task, in fact if humans can easily distinguish between two sounds, such as a birds' chirps and a car passing by, based on prior experience, a machine
may not be able to do so without apprenticeship. Therefore, a learning methodology must be constructed for the machine by establishing recognizable patterns. The aim of this paper is to identify the feature sets which allow the algorithm to differentiate spurious sounds in the best way. These
features will represent the semantic value of the signal.
Study of the acoustic features and exposures of some typical construction noise sources in India
Authors: MYINT THU MOH MOH , SINGH SNEHA
Published: October 2024

Occupational noise research and occupational noise standards to date are limited to continuous, non-fluctuating broadband noise and uniform exposure. However, in many occupational environments, such as the construction sites, the workers may be exposed to continuous or intermittent
noise of varied spectral and temporal patterns, and their exposure may not be continuous or uniform. These differences in sound signals and sound exposures may have different effect on humans. This paper studies the sound signals of various sources in construction sites of the institute campus
through in-situ measurements. The key acoustic features and the spectral content of the sound signals are analyzed. The findings show that construction workers in India are exposed to construction noise with widely varying spectral content. A modified permissible upper limit of construction
noise is developed for the presented case study and it is found that five out of eight studied construction sources violate the permissible limit and pose a noise hazard to the construction workers. The study suggests the need for updating occupational noise guidelines based on the noise types
and exposure types; and imposing stricter measures for protecting the workers against the construction noise.
Study of noise perception and health effects on population through a questionnaire in Spanish households during the COVID-19 lockdown
Authors: CASLA-HERGUEDAS Belén , ROMERO-FERNáNDEZ Amelia , CARRASCAL Teresa , NAVAS-MARTíN Miguel Ángel , TERESA Cuerdo-Vilches
Published: October 2024

During the first wave of COVID-19, an online questionnaire was conducted to gather the Spanish population's perception of noise from households and its relationship with health effects. This research, which was conducted with 582 participants, examined several sources of noise (general
noise, noise produced by family members inside the home, noise from neighbors, noise from common areas, facilities, and exterior noise) and various self-declared health effects by the participants such as stress, lack of concentration, sleep disturbances, anxiety, or irritability. A descriptive
and statistical analysis was established between variables to observe relational trends for two periods (before and during confinement). The study demonstrates interesting relational trends that allow for both associating different noise sources with potential health effects and contextualizing
them against other causes that remained consistent in both periods.
3D audio recording of complex underwater sound fields
Authors: SCHUCKER Stefan , RYCHEN Jörg
Published: October 2024

In this study, we developed a method to capture underwater sound fields and reproduce them for human listeners, providing an immersive 3D auditory experience. We recorded the sound field with an array of four hydrophones arranged in a tetrahedral structure. The side length of the tetrahedron
(around 70 cm) was a compromise between capturing accurately the low frequency pressure gradients and spatial aliasing effects at higher frequencies. Subsequently, we transformed the signals into the domain of spherical harmonics facilitating a representation as first-order Ambisonics that
is independent of the recording. For playback on devices such as headphones or loudspeaker systems, we used established decoding routines that enhance the immersive audio experience with techniques such as parametric decoding and diffuse sound field equalization. During an expedition to northern
Norway, we recorded the underwater soundscape in deep fjords with vocalizing killer whales and singing humpback whales. The resulting binaural renderings for headphones of these sound scenes are astonishing and sparked interest among scientist, artists and general public. This research also
helps to enhance our understanding and perception of these intelligent marine mammals and their unique acoustic underwater world, ultimately aiding in better protecting them from noise pollution.
Exploring the application of a Bayesian framework in transfer path analysis
Authors: SHEN Weihan , CREIXELL-MEDIANTE Ester , BRUNSKOG Jonas , LUCKLUM Frieder
Published: October 2024

Transfer path analysis (TPA) is a methodology widely used in transmission identification of vibration and noise. Among the TPA families, the two prevailing approaches are classical TPA with the matrix inversion method and operational transfer path analysis (OTPA). Both methods rely
on measurements within costly and complicated overdetermined systems. These experiment-based methods are also limited by sufficient space for the sensor mounting, which can result in difficulty when analyzing the transfer path in small objects. In this paper, we use an experimental setup that
mimics an engine mounted on a suspension with resilient connections. The severity of errors stemming from the application of underdetermined measurement systems is assessed, alongside an exploration of how the Bayesian framework can be integrated into the analysis to mitigate errors and enhance
the performance of TPA.
A comparative study of noise event identification using AI in unattended monitoring
Authors: EJDFORS Karl Henrik , SATO Naru , SæLE Lars Andreas
Published: October 2024

This paper explores the use of multi-microphone devices and artificial intelligence (AI) for identifying noise events in unattended noise monitoring. The primary focus is to assess the reliability of a machine learning model initially trained on a dataset representing a particular soundscape.
We evaluate the performance of this model when applied to diverse datasets collected from similar yet distinct soundscapes, encompassing various environmental conditions and noise profiles. Through comparative analysis, we determine the model's adaptability and potential limitations. The findings
of this study offer insights into how well AI-based noise event identification models can work in different situations. This lays the groundwork for enhancing their applicability in diverse real-world settings and improving how well unattended noise monitoring systems function.
Fundamental study on the difference between materials and vibration conditions in piezoelectric vibration power generation using electromechanical coupling phenomena
Authors: TSUCHIYA Hirotarou , TSUCHIYA Mika , NAGATANI Shunto , MORIYAMA Hiroyuki , UCHIDA Helmut Takahiro
Published: October 2024

Conventionally, vibration energy and sound energy are emitted as noise and vibration. We have proposed a system that converts the vibration of the plate into energy. In this study, a circular plate of constant thickness, on which a piezoelectric element was installed, was adopted as
the host structure of an energy-harvesting system. The plate was supported at its elastic end, which was intermediate between simple and clamped supports, and was subjected to a harmonic point force. The piezoelectric performance of the system was highly dependent on the vibration characteristics
of the plate. Regarded as one of the representative vibrational characteristics, the natural frequency of the plate was affected by the materials, excitation positions, and vibration modes of the plate. Therefore, the plate materials varied the natural frequency, thus affecting the conversion
of vibration energy into electrical energy through the piezoelectric effect. In this study, we investigated plates made of selected materials commonly used in industry and tested different excitation conditions. As the result, we clarified that the proposed system is almost unaffected by the
material of the plates, and it was shown to be useful.
Assessment of environmental noise capacity for Indian Highways
Authors: SINGH Ashish , RAJASEKAR Elangovan , PARIDA Manoranjan
Published: October 2024

India is one of the rising nations with a diverse traffic mix. Heterogeneity of traffic is a key factor in determining the noise environment around roadways. This study aims to assess the environmental noise capacity of Indian highways. To gather data for the study, Indian highways,
namely NH-334, NH-7, and NH-344, were selected, specifically focusing on the sections, settlements near the highway. Four specific locations along these highways were chosen to measure the noise levels and collect comprehensive traffic data. The vehicles were classified into two categories:
light vehicles and heavy vehicles. Traffic volume was assessed using videography, while traffic speed was determined using a radar gun. Sampling occurred at 15-minute intervals, encompassing both peak and off-peak hours on weekdays and weekends. A total of 460 data sets were collected to facilitate
the prediction of equivalent noise levels (Leq). Environmental noise capacity (ENC) was calculated at all selected locations, revealing that the ENC value exceeded zero. This indicates that the noise levels in all areas surpassed the designated capacity. This study provides valuable insights
for policymakers in developing strategies to mitigate the impacts of increasing highway noise.
Innovative design of façade elements to limit wind-induced noise in buildings
Authors: MASSON Florent , CHASSAGNE Pierre , AGRELI Henrique
Published: October 2024

Wind-induced noise is often overlooked in building design. This noise can be generated by wind blowing across façade elements or through the various gaps inside buildings. Noise generated by wind-affected façade elements, particularly at higher wind speeds, has received
increasing attention since the 2010s. In this paper a comprehensive literature review is carried out to draw general rules for limiting wind-induced noise in buildings. Next, an innovative design was proposed by Metravib Engineering for the Rabat Ibn Sina hospital designed by AIA Ingénierie.
A dynamic analysis of these sunshades was then verified using the finite element method to ensure there was no vibro-acoustic coupling between wind excitation and the sunshade's structural modes. Finally, wind tunnel tests confirmed that the noise induced by these façade elements was
under control and did not cause any particular annoyance.
Application of a multi-criteria decision technique to assignation of acoustic classes
Authors: KURRA Selma , SENTOP DUMEN Ayca
Published: October 2024

Acoustic performance evaluation of buildings prior to the acoustic classification, requires consideration of a number of factors with the corresponding quantitative criteria to be satisfied. It is of question how much the deviations can be compensated and whether all performance factors
are equally important. This paper presents the results of a study on assigning priorities for each acoustic factor by using the analytic hierarchy process (AHP) - a multi-criteria decision technique - based on the expert evaluations. Eleven acoustic consultants rated seven acoustic factors,
i.e. regulatory criteria of sound insulation, sound level and reverberation time, in pairwise comparisons. The data were aggregated after a consistency check and weights of each acoustic factor were calculated as well as weights of six acoustic performance classes ranging from A to F. The
outcomes of this study resulted in a decision matrix, named as "acoustic scorecard" which can be used to obtain a single-number rating index for acoustic quality of buildings.
Assessment of the acoustic environments in dementia care units: a case study
Authors: MARKUSSEN Anette , SENTOP DUMEN Ayca , HARBAK Rune , RASTEN Elin
Published: October 2024

Dementia patients represent a particularly vulnerable group of people that are easily affected by their surroundings. Minor disturbances can lead to challenging behavior for the caregiving staff. Sensory stimulation is a critical factor in the treatment of these patients. At the same
time, there is a challenge associated with it overstimulation as this can lead to social isolation, known as a factor that increases the risk of developing a dementia diagnosis. Therefore, a tailored sound environments is important to promote an inclusive environment for the patients to increase
their well being and life quality. This study aims to discover the acoustical conditions at dementia care units in two hospitals, examine the impact of acoustic environment on patients and provide feedback about the existing standards and regulations for such buildings. In-depth interviews
and measurements are combined to conduct both qualitative and quantitative feedback from the actual environment and users. The results can be used to develop acoustical design criteria for dementia units in the future.
Selection of measurement positions for measuring sound reflection of noise barriers
Authors: FUCHS Andreas , NOWAK Jonathan , CONTER Marco
Published: October 2024

The number of positions for the in-situ measurement of sound reflection under direct sound field conditions according to EN 1793-5 for road traffic noise reducing devices (NRDs, e.g. noise barriers) depends on the surface structure of the device under test. The surface structure and
material homogeneity may be categorized as flat and non-flat as well as homogenous and inhomogeneous. Flat and homogenous NRDs are measured with one central measurement position, whereas non-flat and or inhomogeneous devices require additional measurements points to assess the overall sound
reflection properties. In the current version of the standard, NRDs are considered flat, if the depth of their surface structure is below 8.5 cm. Also, they are considered homogenous if the lateral extent of each material is at least 8.5 cm. It is discussed to reduce this criterion from 8.5
cm to 1.7 cm, as research showed significant differences on devices considered as flat between measurement positions for the sound reflection index. An extensive analysis of sound reflection measurements shows the influence of the measurement position for noise barriers with structural depths
below 8.5 cm. A new strategy for selecting measurement positions is proposed, which also considers the period length of the surface structure.
Topological interface states in deep-subwavelength phononic beams with acoustic black hole configurations
Authors: JEON Wonju , PARK Seongmin
Published: October 2024

We present deep-subwavelength phononic beams engineered with unit cells incorporating acoustic black hole (ABH) configurations. The ABH design enables the realization of topological interface states (TISs) within the first band gap at low frequencies, where the lattice constant (a)
is far smaller than the wavelength (λ) of the controlled wave. Manipulating the ABH configuration and breaking the unit-cell symmetry allow us to control Zak phases for the topological beams. Two topologically distinct phononic beams are interconnected to produce the TIS within their
low-frequency band gaps. Through numerical and experimental demonstrations, we confirm the existence of TISs at frequencies ranging from 4.3 to 8.5 Hz using the designed topological beams of which a/λ is less than 1/20. We also offer the potential to further reduce the value of a/λ
by rearranging the ABH unit cells.
Mapping the health impacts of transport noise in the densely populated area of the Île-de-France region
Authors: MIETLICKI Fanny , DECOURT Victor , JAMARD Pierre
Published: October 2024

The European Noise Directive (END) requires agglomerations of more than 100,000 inhabitants to produce strategic noise maps. In the Ile-de-France region, 14 agglomerations with a total population of 10,5 million inhabitants are concerned. Bruitparif applied the health impact assessment
methodology recommended by the WHO to carry out a detailed territorial diagnosis of the issues related to transport noise. For this purpose, population exposure was assessed on the basis of strategic noise maps produced according to the 4th round of the END and the associated risks were calculated
using the exposure-response functions published by the WHO in October 2018. The work continued with the valuation of healthy life years lost due to transport noise. Two types of maps have been produced with a 200 m2 grid as well as at the city scale: maps of collective health impacts related
to population noise exposure and maps of average individual risk corresponding to the potential impact per individual. The combination of these two types of information has made it possible to highlight significant territorial disparities and to identify the sectors most concerned by the health
issues related to noise, a prerequisite for prioritizing public action.
Revision of Japanese guidelines for the prevention of noise-induced impairments in 2023
Authors: YOKOYAMA Sakae , KOBAYASHI Tomohiro
Published: October 2024

In Japan, the guideline for the prevention of noise-induced impairments published in 1984 was revised in 2023. The revisions include changes to the definition of target workplaces, methods for measuring noise levels, and methods for selecting hearing protection equipment. Additionally,
prior to the revision of the guidelines, Japanese industrial standard (JIS) regarding the method for measuring the sound attenuation performance of hearing protectors was established in 2020. The old JIS was a product standard, but it was changed to a method standard with the ISO standard
as an international standard. The new JIS has adopted single number rating (SNR) as an evaluation index. In recent years, Japan's guidelines and standards related to occupational noise have been internationally harmonized, but currently they are only published in Japanese. In this paper, an
overview of the guidelines for the prevention of noise-induced impairments revised in 2023 will be mainly presented. This paper also introduces measuring device for noise exposure level, fit testing equipment, and real-ear attenuation at threshold (REAT) testing currently available in Japan.
An overview of the new JIS was previously reported at inter-noise conference in 2021.
Relationship between greenery and the health of Madrid's citizens
Authors: REY-GOZALO Guillermo , BARRIGóN MORILLAS Juan Miguel , MONTES GONZáLEZ David , VíLCHEZ-GóMEZ Rosendo , IGLESIAS-MERCHáN Carlos , MERINO-DE-MIGUEL Silvia , AUMOND Pierre , MUñOZ-BERMEJO Laura , PéREZ PINTOR José Manuel , MORENO GONZáLEZ Celia
Published: October 2024

The increase in parks will be one of the interventions in future cities to reduce pollution and enhance the quality of life. However, it is crucial to identify the variables within parks that have the most significant impact on well-being and health, given the substantial limitation
of urban space. Different parks in Madrid were analyzed in this study, and simultaneously with the recording of environmental variables, their users were surveyed. The study's hypothesis aimed to determine whether the activities carried out in the parks have a greater impact on health than
their mere presence. The quality of parks is an influential factor in these relationships; therefore, the quality of the acoustic environment was considered. The results indicate that the quality of the soundscape is a significant factor in the development of various activities and the overall
perception of the park, making it a variable to consider in the design and improvement of the quality of green spaces. Greenery visibility is significantly related to the perception of health status, but this relationship is less intense than that provided by frequent activities in these green
spaces such as walking and relaxation.
Impact of car electrification on urban noise pollution: a microscopic traffic simulation study
Authors: BACLET Sacha , NYGREN Johan , RUMPLER Romain
Published: October 2024

Noise pollution is a major health and well-being concern, being associated with, e.g., sleep disturbance, annoyance, and cardiovascular diseases. Road traffic is, by far, the largest contributor to this noise pollution in urban areas. With the growing electrification of cars in developed
countries, it is commonly believed that road traffic noise pollution and the associated problems will disappear shortly in urban areas. However, at high speeds, the difference in noise emissions between internal-combustion-engine and electric vehicles is not significant, and at low speeds,
the propulsion noise of electric cars is not negligible. Few works have quantitatively estimated the actual impact of passenger cars electrification on population exposure to noise, especially considering such aspects as the gradual transition towards a fully electric fleet. The present contribution
thus aims to assess the evolution of population exposure to noise pollution, using a microscopic traffic simulation on the scale of an entire city, noise mapping, and various indicators, at multiple stages of this transition.
Aligning residential acoustic design guidance with the health evidence: a new proposal for the UK
Authors: FENECH Benjamin , HARVIE-CLARK Jack
Published: October 2024

BS 8233 is a British Standard widely used for its residential design guidance. The current version specifies guidelines for internal sound levels within dwellings with partially open or closed windows. However, the epidemiological evidence on the health effects of environmental noise
is largely expressed in terms of external sound levels. We propose a change to a two-step approach. First the external sound levels are used as the primary design driver for good environmental acoustic design, to align with the noise and health evidence. Good environmental acoustic design
is a process that can minimise external sound impact through appropriate measures such as site layout, building orientation, massing, landscaping, and noise barriers. The impact of environmental sound is quantified in terms of its health effect (DALYs) and monetary social cost (GBP) to define
categories of adverse effect that can help inform decision-making. Once external levels are minimised through good environmental acoustic design, the building envelope can provide mitigation to achieve a good internal environmental quality. The proposed approach moves away from prescribing
fixed internal targets in all cases. Instead, it considers ventilation needs for indoor air quality and provisions for mitigating overheating risks holistically alongside internal acoustic conditions.
Investigating the after effect of head-tracked movement on externalization for varying sound sources in binaural synthesis.
Authors: COLAS Tom , HENDRICKX Etienne , FARRUGIA Nicolas , PAQUIER Mathieu
Published: October 2024

Binaural audio reproduction aims to create a realistic auditory experience for the listener through headphones. However, front and rear sound sources are often internalized (perceived inside the head) rather than externalized (perceived outside the head). Previous studies have shown
that large head movements can significantly improve externalization, and that this improvement can persist even after head movements have stopped. This study examined how head-tracked movements influence the perception of sound externalization depending on the nature of the sound sources.
The stimuli consisted of a first ``head movement" part during which the participants had to either perform a head movement or stay still, followed by a "rating" part where they evaluated externalization without moving. The sound sources during the ``rating" part could be
similar, slightly different, or very different from the source during the head movement part. Results demonstrated that head-tracked movements effectively heightened externalization perception for all types of sources immediately after the movement. The type of source (female voice, male voice,
or pink noise) did not affect perceived externalization. These findings suggest that the externalization enhancement induced by head-tracked movement persists after the movement ends even when encountering a different sound source.