bluuebunny/crossref_metadata_2025 huggingface dataset:
Reconstructing the soundscape of the ancient Hippodrome of Olympia for an immersive sonic experience of heritage sites based on sound source description in texts
Authors: AL-BAYYAR Zinah , KITAPCI Kivanc , CELEBI Gulser , DOKMECI YORUKOGLU Papatya Nur
Published: October 2024

This study attempts to reconstruct and auralize the soundscape of the Hippodrome of Olympia in Greece. This UNESCO world-heritage-listed-site is considered the evidence of the Greek hippodromes. Hippodromes used to have several activities from which different combinations of sound sources
created the soundscape. To collect sound sources, description in texts of site is sought by implementing methods of the archaeology of soundscape and the suggested criteria of contextual, internal, and comparative certainty for archaeoacoustics studies. The description of these activities
facilitates reconstructing and auralizing the soundscape during different phases of events in the hippodrome. The results of the study showed that the information about the activities on the hippodrome, on similar hippodromes of different civilizations, and on similar hippodromes of later
eras are rather sufficient to create a comprehensive soundscape of the site. Auralizing the reconstructed soundscape by using current auralization software and techniques promises of immersive experience of ancient sites that enhances understanding the sonic intangible cultural heritage element
and the experience of the ancient soundscape. Furthermore, ancient users' perception of the soundscape can be approached by localizing the sound sources on the site and obtaining the corresponding acoustical properties, providing information of users' response to the sonic outcomes
Development of a feed-forward audio-visual notification system for reducing motion sickness in autonomous vehicles
Authors: JEON Jin Yong , LEE Haram , YOON Hyowon , SANTIKA Beta Bayu , CHOI Sung Uk , MOON Hoseong
Published: October 2024

To mitigate motion sickness occurring in seat positions where driving conditions cannot be predicted due to the changed interior structure of autonomous vehicles, a feed-forward audio-visual notification system was developed. The design, implemented in the driving environment, provides
information through ambient light and notifying sound by predicting signal processing information, including steering angle and turn signals, to address the audio-visual impact of changes in the vehicle's direction, speed, and acceleration with feed-forward alerts. The correlation model between
psychological and physiological responses was developed through measurements such as MSQ, MISC, EEG, fNIRS, and HRV during driving, quantifying the degree of motion sickness and improvement situations. The effect of visual variation by ambient light and the customized effect of notifying sound
were combined to compare and analyze the degree of motion sickness reduction following the installation of the notification system.
Towards a simplified model for partially open windows - connecting acoustic and thermal comfort
Authors: HARVIE-CLARK Jack , FUSARO Gioia , PEREIRA Luis , HILL James , HEALEY James
Published: October 2024

Traditionally, the internal environmental quality (IEQ) aspects of acoustic and thermal comfort have been considered and designed separately. However, where occupants rely on opening or closing windows to achieve these dimensions, they are not independent in use. To consider both simultaneously,
it is crucial to have a simple model of a partially open window that can predict both acoustic and thermal conditions internally. CIBSE TM59 defines the assessment method for adaptive thermal comfort. In the thermal model the ventilation performance of open windows can be described with an
"Equivalent Area" (EA). We propose to use the EA to calculate the facade sound insulation based on a simple assessment according to Annex D of ISO 12354-3, i.e. as a facade element with an area of EA and zero sound insulation. This study presents field measurements of sound insulation
according to ISO 16283-3 with road traffic sound sources, to evaluate the acoustic uncertainty of using the EA to calculate internal sound levels. Results show encouraging correlation between measurements of element-normalized level difference, Dn,e,w + Ctr and calculations based on the EA.
This model is considered adequate for acoustic design purposes, and represents a significant simplification compared with previous proposals.
Optimised implicit methods for audio rate wave-based acoustic simulation
Authors: BILBAO Stefan , SMITS Jan
Published: October 2024

Wave-based room acoustic computation at an audio rate (i.e., covering the complete range of audible frequencies) is computationally intensive. There is thus a great incentive to develop simulation methods that allow for "accurate" simulation at the lowest possible computational
cost, taking into account requirements for massively parallel implementation. Though often formal measures of order of accuracy are employed, in this paper, we examine the optimisation of a locally-defined implicit family of schemes against wideband measures of accuracy, based on the minimisation
of numerical dispersion over a specified frequency range. The resulting optimised scheme is defined over a Cartesian grid, and allows performance gains over standard schemes (such as the basic rectilinear scheme, or schemes defined over face-centered cubic grids, and other implicit designs
presented in the literature). Numerical stability conditions are easily formulated, and can be built into the optimisation, alongside the computational cost of linear system solution. Simulation results and comparisons of computation times against other known methods are presented.
Impact noise calculations of CLT constructions using finite element
Authors: BALMES Chloé , BRUNSKOG Jonas
Published: October 2024

Cross-laminated timber (CLT) consists of multiple glued layers of wood, which have perpendicular orientation with respect to adjacent layers, and it has become an important building material due to its light weight, strength, and sustainability. One problem with CLT constructions is
the impact noise, which for a bare CLT floor is poor. There thus is a need for calculation tools that can predict impact noise level of such floor constructions. For composed constructions, finite element is a flexible and usable tool. However, to simulate real measurement scenarios, the force
produced by the ISO tapping machine then needs to be estimated. This paper revisits this estimation and performs calculations of the impact noise level of a CLT floor, and compares this with measured results.
Prediction of train interior noise due to the HVAC system
Authors: DIEZ Itxasne , KOVALEVSKY Louis , GUIRAL Ainara
Published: October 2024

In recent years, the significance of acoustic comfort in rail vehicles has grown considerably, owing to its direct impact on passenger well-being. As a consequence, interior noise levels are progressively becoming more restrictive. Meeting these requirements is a key challenge for rolling
stock manufacturers. The predominant source in stationary condition is the HVAC (Heating, Ventilation, and Air Conditioning) system. To effectively assess and potentially reduce the noise generated by the HVAC system, the availability of tools and methodologies for predicting the propagation
of noise through the air ducts and interior noise levels in the passenger compartment during the design phase is crucial. This paper presents a simulation methodology for predicting interior noise levels by evaluating various alternatives within a commercial software. Input data for the simulations
encompass the geometry and materials of the supply and return ducts, along with the acoustic power of each outlet measured at the source. This data is associated with the nominal operating mode of the HVAC system. Finally, the paper establishes a correlation between the simulation results
and in-situ measurements conducted on the completed train, with the HVAC equipment operating under nominal conditions.
Instrumentation and automatic evaluation of event indicators alongside railway lines: a first attempt to comply with article 90 of the French mobility legislation on transport
Authors: EL GUEROUANI Wafae , CIUKAJ Sebastien
Published: October 2024

According to the Article 90 of the French Mobility Orientation Law (LOM) No. 2019-1428 (December 24, 2019), the Testing and Measurement Laboratory (LEM) of the Régie Autonome Des Transports Parisiens (RATP) 1 has been at the forefront in determining and evaluating indicators
of annoyance due to event-related noise from railway transport infrastructure. Six measurement points located near tramway, metro, and suburban trains transport infrastructures were equipped with specific instrumentation allowing for measuring and automatically detecting railway and non-railway
sound events (road traffic, alert sirens, and other sound activities), this multiplicity of noise sources necessitated a comprehensive approach to data collection and analysis, ensuring accurate assessment of the impact of railway transport infrastructure on surrounding area. Measurements
were carried out continuously for 15 days. A post-processing system was also developed to analyze over a dozen noise indicators for each category of sound events. This article presents the technical solutions developed and deployed by the laboratory in a few months to address the regulatory
challenges posed by the experimental phase of Article 90 of the LOM law.
Health effects related to wind turbine sound - a rapid evidence review covering 2020 - 2024
Authors: WOODLAND Lisa , MINKIN Michaela , FENECH Benjamin , WOODLAND Lisa
Published: October 2024

Wind energy plays an important role in the delivery of net zero and energy security commitments, and globally wind additions are forecast to more than double by 2028 compared with 2022. Permitting frameworks have been identified as a key barrier to growth of onshore wind, and the health
effects of wind turbine sound emissions remain a primary concern to local communities. Evidence reviews published in 2017 and 2020-21 concluded that the health effects literature is increasing, but there are still gaps, especially for health endpoints other than annoyance, and how non-acoustic
factors can moderate and/or mediate self-reported health outcomes. We carried out a rapid evidence review covering the period July 2020 to February 2024 to determine if newer evidence is addressing these gaps. Of the 22 studies about health effects, most focused on self reported health, annoyance,
and sleep disturbance. Studies about other health effects remains limited. Studies on "social acceptance" (n=10) continue to show the importance of non-acoustic factors,such as attitudes and personal characteristics are in impacting outcomes. No intervention studies were identified.
Due to variations in study design, exposure and outcome measures, and how non-acoustic factors are characterised, it remains challenging to make generalised recommendations to mitigate health impacts.
Determining the relevance of noise barriers along railway lines based on a multi-criteria analysis
Authors: REGAIRAZ Jean-Philippe , ROSIN Christophe , BOULANGER Léo , CORDOLIANI Théo
Published: October 2024

Rail transport is one of the friendliest in environmental terms, but the noise generated by this mode of transport remains a weak point. To improve local residents' living conditions against this noise, two locations for protection devices are possible : close to the source, to be preferred
in accordance with French legislation, within the limit of economical acceptability (not defined) or by façade insulation otherwise. A method has been developed to assess the relevance of noise barriers or merlons based on a cost-benefit analysis. A multi-criteria analysis is required,
based on acoustic benefits provided by protection near to the source, building density, number of people protected, technical feasibility, costs directly linked to the construction conditions and landscape integration possibilities. The article details the method used during the preliminary
study phase to determine the possible conditions for implementation, the associated costs and the impact of protection, and presents the analysis grids used to validate the choice of protection type, close to the source or on the facade.
The effect of noise on concentration for people with and without hyperacusis
Authors: HODOSHIMA Nao
Published: October 2024

People with hyperacusis tend to react negatively or show avoidance behavior toward moderately intense environmental sounds because they perceive such sounds as being very loud and painful. Hyperacusis influences emotional well-being, hearing, and concentration. This study compared the
number of correct answers of addition in quiet and in noise between 11 young adults with hyperacusis and ten young adults without hyperacusis (aged from 19 to 38 years). All participants had normal hearing. People with hyperacusis were recruited online, complaining of symptoms of hyperacusis,
and their scores on the Japanese version of the Khalfa Hyperacusis Questionnaire were high enough, according to a clinical study on hyperacusis. The noise was a mixture of babble noise and the sound of a fork clanging a plate, which are typical sounds annoying people with hyperacusis, and
presented at 75 dBA. Results showed that the number of correct answers in noise was significantly lower than in quiet for participants with hyperacusis, while there was no significant difference for participants without hyperacusis. The results suggest that noise reduces concentration more
for people with hyperacusis than those without hyperacusis, and support can be needed for hyperacusis, especially at places requiring concentration, such as educational or working environments.
Artificial intelligence in creating, representing or expressing an immersive soundscape
Authors: Ayoubi Rima , Park Sang Bum , Lescop Laurent
Published: October 2024

In today's tech-driven world, significant advancements in artificial intelligence and virtual reality have emerged. These developments drive research into exploring their intersection in the realm of soundscape. Not only do these technologies raise questions about how they will revolutionize
the way we design and create soundscapes, but they also draw significant inquiries into their impact on human perception, understanding, and expression of auditory environments. This paper aims to review and discuss the latest applications of artificial intelligence in this domain. It explores
how artificial intelligence can be utilized to create a virtual reality immersive soundscape, exploiting its ability to recognize complex patterns in various forms of data. This includes translating between different modalities such as text, sounds, and animations as well as predicting and
generating data across these domains. It addresses questions surrounding artificial intelligence's capacity to predict, detect, and comprehend soundscape data, ultimately aiming to bridge the gap between sound and other forms of human-readable data.
Experimenting innovative active sound design to reduce driver weariness in electric vehicles
Authors: MINARD Antoine , CERA Andrea
Published: October 2024

With the current electrification trend in the automotive industry, electric vehicle sonification, both interior and exterior alike, has become common practice. To provide drivers with an alternative to the familiar thermal engine rumble, car manufacturers have been exploring many sound
design strategies. Quite often however, these designs suffer from a form of weariness that the driver may feel over time, many of them eventually choosing to simply turn off these sounds meant to help them. The goal of the present work is to address this issue by proposing some experimental
active sound design strategies whose goal is to break the relative monotony of classical electric vehicle sound design. This is achieved thanks to the combination of advanced seamless audio synthesis tools and generic preprocessing of vehicle data to create new audio control parameters allowing
us to explore uncharted grounds for electric vehicle active sound design.
Estimation of stresses in 1D structures via inverse wavenumber analysis
Authors: FICHOT Damien , MARGERIT Pierre , CASTELNAU Olivier
Published: October 2024

The ANR ITHERATE project proposes to develop identification procedures of residual stresses in additive manufacturing via in-situ and non destructive methods using the wide band wave response of structures. This work presents a proof on concept on one-dimensional waveguides, as a preliminary
results to more complex configurations. An original experimental setup is implemented using a cylindrical lens to optically amplify the vibrations of the structure in the transverse direction, allowing to resolve the wave propagation with a high-speed low-resolution camera. The dispersion
of the wave velocity with the frequency, obtained via high-resolution wavenumber analysis (HRWA), is compared to predictions given by the acousto-elastic theory. In particular, the effects of the quasi-static initial stress and the elasticity of the material can be separated and estimated
seperately via an inverse method that is independent from the boundary conditions and applied loads. Interestingly, this wave-based estimation does not necessitate an a-priori knowledge of the material constitutive law, overcoming the limitations of most stress estimation techniques of the
state of the art, that are based on a measurement of the strain. Finally, perspectives for the generalization of the method to more complex situations, as plates under thermal loads, will be presented.
The mitigation of airframe noise using a Krueger flap as a leading-edge device in a high-lift configuration
Authors: LI Shuai , DAVIDSON Lars , PENG Shia-Hui , POTT-POLLENSKE Michael
Published: October 2024

High-lift device is a potent airframe noise contributor. The conventional slat, commonly used in a high-lift device, is known as one of the dominant noise sources. Here, we combine an experimental and a numerical approach to investigate the noise generation of a conventional slat and
two Krueger flaps as leading-edge devices in a high-lift configuration. To reduce the computational cost, a short span of the entire high-lift device is selected as the focusing region for scale-resolving and acoustic computations using Improved Delayed Detached Eddy Simulation (IDDES) coupled
with the Ffowcs-Williams and Hawkings (FWH) analogy. Simulation results show that turbulent cross flows induce slightly lower-level noise spectra at frequencies less than 300 Hz when the two spanwise sides of the FWH permeable integral surface are closed. Wind-tunnel test results show that
the reference and optimal Krueger configurations effectively attenuate the dominant tone of the conventional slat by 4 and 6 dB, respectively. Besides, the optimal configuration is very effective in noise reduction in a wide frequency range. However, the reference Krueger configuration increases
the noise level by 0 − 4 dB at frequencies exceeding 5, 500 Hz. Overall, the optimal Krueger configuration is a good choice for high-lift device noise mitigation.
Estimation of ground vibration emission increase with respect to velocity in high-speed railways
Authors: SOLE BOSQUET Jaume , HUGUENET Pierre , BEWES Oliver , SICA Gennaro
Published: October 2024

During the design of a new line, it is often necessary to estimate railway vibration emissions at a given future speed from experimental data in similar circumstances, but at a different speed. Future levels are usually estimated according to a logarithmic evolution law with respect
to speed, a typical one being that in USA FTA Report nº0123 "Transit Noise and Vibration Impact Assessment Manual", a de facto standard in the sector. Also, it is known that for high-speed lines a drastic increase in vibrations is observed when railway speed is higher than the
propagation speed of surface Rayleigh waves. This phenomenon, known as trans-Rayleigh boom, produces a sharp discontinuity in the evolution of vibration emissions. However, vibration levels observed in the vicinity of a high-speed line have shown values well above the prediction rule suggested
in FTA Manual, which could not be explained by a trans-Rayleigh boom. A more accurate extrapolation method based on local rail roughness measurements is capable of producing improved predictions compared to FTA rule of thumb. This contribution shows the details of the method suggested, and
the improvement in the prediction (with respect to FTA extrapolation law) obtained in the specific case of a high-speed railway.
Towards the development of measurement and analysis method for aerodynamic noise emission from high speed train: the UIC Aeronoise Project
Authors: SOLE BOSQUET Jaume , SICA Gennaro , HUGUENET Pierre , LURCOCK Daniel , KAIRA Tuomas
Published: October 2024

The increase of railway lines operating at speeds above 250 km/h has shifted the attention towards environmental noise emissions by aerodynamic noise, dominant at these speeds. Adding complexity to the issue, while railway noise emissions at conventional speeds are concentrated in the
lower parts of the train, aerodynamic noise emissions are distributed along the train at different heights and depending on the train design. Assessment of aerodynamic noise emissions of high speed train has been endeavored using microphone arrays, implementing different variants of the wave
beamforming algorithm. This method involves a quite complex post-processing, and also numerical quantification of results is not immediate. UIC AERONOISE project has aimed at developing a simplified pass-by test methodology capable of quantifying aerodynamic noise emissions from high speed
, using exclusively a limited number of standard instrumentation microphones. This methodology has been validated theoretically and is currently undergoing experimental tests. Fundamental points in this methodology are explained in this contribution, together with results achieved so far.
Prediction of sound around shooting ranges
Authors: VAN DER EERDEN Frits , VAN DEN BERG Frank , EISSES Arno , VAN HEIJNINGEN Ad
Published: October 2024

The assessment of sound around shooting ranges can be challenging. On one hand, methods to predict the sound levels around shooting ranges are described in the standard ISO 17201 "Acoustics - Noise from shooting ranges". It consists of measurement and calculation methods to
determine the source strength from muzzle blasts or explosives and supersonic projectiles, as well as a method for the sound propagation. The methods to calculate the muzzle and projectile sound are being updated this year. On the other hand, challenges remain to measure the source strength
from weapons with a large caliber and the sound emitted from shooting facilities with a complex geometry. These issues and its approach are illustrated. Also, a noise management method is described, as a pilot study, that allows for a flexible use of different weapons for a given period of
time, typically a year.
Consideration and case study using a time-difference-of-arrival directional device for occupational noise measurement
Authors: SATO Naru , EJDFORS Karl Henrik , NAKAICHI Takeshi , FASTING Erlend , SÆLE Lars Andreas
Published: October 2024

To protect worker's hearing in noisy workplaces, noise levels are measured periodically, and noise sources are located based on the results of recordings or video cameras. If the noise level is above a certain level, noise abatement measures are taken, or workers are suggested to wear
hearing protection. Measuring the noise level can be done simply by placing a sound level meter on the floor, but finding the noise abatement is a time-consuming task. It is necessary to listen to the recordings one by one or review the video to find the noise abatement. We believe that a
simple method of estimating noise abatement is very useful, since some noisy workplaces do not allow recordings or video cameras for privacy and confidentiality reasons. In this paper, noise source identification using a time-difference-of-arrival directional device in an indoor environment
is examined. The results are analyzed in the context of room properties such as reverberation time, dimensions, and device localization. The paper also reports on practical use-cases in actual sites.
Fundamental study on ambient noise reduction for analysis of hitting sound of professional baseball players
Authors: MIYAZAKI Tsuyoshi , MATSUO Sora , SHIMADA Hiromu , TANAKA Hiroshi , UEDA Mari
Published: October 2024

In recent years, the sound of a hitting ball during a baseball game has focused attention on the American Major League Baseball and Japanese professional baseball. It is reported that information such as the direction and distance of a batted ball can be detected from the sound. The
sounds of players hitting the ball are sometimes expressed using various onomatopoeic. In our previous study, we recorded the sound of a baseball hit during hitting practice for players of a university baseball team in the Tokyo metropolitan area in Japan. Relationships between the acoustic
characteristics of the sound and the distance and direction of the ball were clarified. In this research, acoustic analysis of professional baseball players' batted ball sounds from Youtube and other videos is used to identify the acoustic features and characteristics of the batted ball. This
paper describes the method and accuracy of noise removal around the hitting sound extracted from the video using a convolutional neural network with images.
Underwater radiated noise explained from ship characteristics and operating conditions - Model obtained from the MARS database
Authors: RABETOANDRO Faniry , CAUCHY Pierre , ST-ONGE Guillaume , MERCURE-BOISSONNAULT Pierre , GERVAISE Cédric , LAFRANCE Sylvain
Published: October 2024

Understanding how ship characteristics and operating conditions impact underwater radiated noise (URN) is key to identifying essential avenues for noise reduction and predict associated risks for the marine life. Previous studies have revealed that current models could only explain
up to 50% of the observed variability in URN levels. In this study, we used a unique dataset, collected within the Marine Acoustic Research Station (MARS) project (www.projet-mars. ca/en). The dataset is consisting of ~1000 acoustic signatures from vessels in the St. Lawrence shipping lane
(eastern Canada), and 174 high-quality signatures from partner vessels following an optimized measurement protocol and considering design parameters, meteorological, and oceanographic data. Applying functional regression, as described by MacGillivray et al. (2022), we quantified the relationship
between vessel characteristics, operation conditions and URN. Our findings quantify the direct effect of the speed, size, and draft on URN across a frequency range of 10-500 Hz. Using these relationships, we propose a tailored URN predictive model representative of the St. Lawrence fleet.
We then compare its performance to previously published models and asses the gains linked to the active collaboration of ship owners, contributing to the wide range of available operation conditions available in our dataset.
Investigating the acoustic performance of metamaterials with internal simple expansion chamber structure
Authors: SAHU Nihar Ranjan , MANDAL Bibhuti Bhusan
Published: October 2024

The tunable acoustic properties are possessed by acoustic metamaterials (AMMs) with internal configurable structures. Nine samples(B1-B9) were designed in SOLIDWORKS and then fabricated using 3D-printed photopolymer resin featuring an internal Simple Expansion Chamber (SEC) structure.
SEC length varied from 2 to 18 mm, maintaining a constant area expansion ratio (m) of 16. Sound Absorption Coefficient (SAC) and Sound Transmission Loss (STL) were measured through the Impedance Tube Apparatus (ITA). The sample with a 4 mm SEC length exhibited a maximum SAC of 0.99 at 4.8
kHz. As SEC length increased peak SAC and peak absorption frequency linearly decreased. Across all samples, STL ranged from 1- 41 dB (0.5-2.4 kHz) and 20-36 dB (2.4-6 kHz) revealing a periodic pattern in the tested frequency range. With SEC increasing from 2 to 18 mm Peak STL decreased from
41.2 to 38.8 dB. This research contributes valuable insights into the design of acoustic materials for effective noise attenuation showcasing the potential for achieving at least a 20 dB reduction in the 2.4-6 kHz range.
Hydro-acoustic numerical methodology to compute noise generated by perforated plates in duct systems
Authors: SALANON Rémi , LENEVEU Romain , REGNIEZ Margaux , SANCHEZ Jean-Max , BOUSSARD Samuel
Published: October 2024

The paper presents an innovative numerical methodology to determine hydro-acoustic behavior of perforated plates. One of the main objectives is to have a methodology that ensures a good prediction of radiated noise in ducts with a limited computational cost. The initial assessment is
carried out considering the entire perforated plate. The acoustic source is determined by applying Lightill Analogy to the CFD results from LES for the whole perforated plate. An acoustic simulation is then performed to determine the dynamic pressure in the duct on either side of the perforated
plate. An experimental set-up is built in order to obtain the noise generated by the perforated plate. It also allows to assess the validity of the established method. A good correlation is observed in terms of dynamic pressure upstream and downstream the perforated plate. An optimization
of the method is then carried out to reduce the computational time by determining the acoustic source generated by a unit hole. This source is then applied in the acoustic simulation to each hole of the perforated plate. Comparison with measurements is also satisfactory for this simplified
method.
Flight test for the noise source modeling of the optionally piloted personal air vehicle
Authors: LEE Seunghoon , CHO Taehwan , WIE Seong Yong
Published: October 2024

An acoustic flight test is carried out in order to obtain the noise hemisphere of the optionally piloted personal air vehicle (OPPAV). The OPPAV is one-seater, research urban air mobility (UAM) being developed by Korea Aerospace Research Institute. Noise radiated from the aircraft is
measured using a microphone array consisting of a total of 78 microphones. Flight logs such as the aircraft position, velocity, and attitude are recorded synchronously with the acoustic signals. Measured acoustic signals are dedopplerized and divided into a number of segments. Noise source
model for the OPPAV flight is constructed using these segments. The noise source model will be used for the assessment of noise annoyance during urban flight of the UAMs.
Developing and testing systems for the attenuation of ships' machinery noise
Authors: ROBIN Olivier , GUY Marc-André , VULLIEZ Mathis , KESOUR Kamal , GAUTHIER-MARQUIS Jean-Christophe
Published: October 2024

With ships operating in areas including important marine biodiversity, it is crucial to understand the sources and characteristics of underwater noise and develop effective measures to mitigate underwater noise's impact on the environment. The underwater noise signature from a ship
is usually dominated by machinery noise and propulsion engines at low speeds. Given the importance of onboard electrical power, diesel generators might continuously function (i.e., even when a ship is docked) and generate low-frequency underwater noise. Université de Sherbrooke (Sherbrooke,
Canada) and Innovation Maritime (Rimouski, Canada) lead a collaborative work focusing on the means and methods for attenuating machinery noise. Two main research axes are considered. The first concerns the setup and validation of a small-scale platform that can be used to test noise reduction
methods in a controlled water basin environment. The second research axis investigates passive, tunable, and possibly multi-resonant vibroacoustic solutions to attenuate machinery noise. These solutions mostly come as 3D-printed folded quarter-wave resonators following spiral or cantilever
resonators. Acoustic resonators can also be embedded into a layer of sound-absorbing material to improve soundproofing properties at specific frequencies. The applications and scope of this work are finally put into perspective.
Estimation and experiment on acoustic properties of rice straw (estimation of sound absorption coefficient based on CT image)
Authors: SAKAMOTO Shuichi , SEINO Shotaro , HOSHIYAMA Kohta , KANEKO Kodai , KOJIMA Yoshiaki
Published: October 2024

The sound absorption characteristics of rice straw were estimated using micro-CT scan images and theoretical analysis. Since it is difficult to express the structure and dimensions of rice straw in a regular manner, the voids in the straw were approximated as clearance between two parallel
planes based on the micro-CT scan images. Using the surface area of the straw and the volume of the voids, a theoretical estimation of the sound absorption coefficient of the straw was made. Propagation constants, characteristic impedance, and normal incident sound absorption coefficient were
obtained for the derived clearance. Since the rice straw is tubular, the sound absorption coefficient was also obtained assuming that an arbitrary CT scan image is continuous in the thickness direction. In addition, the sound absorption coefficient was estimated from ordinary photographs taken
of the sample incident surface. In the experiments, the sound absorption coefficient was measured using a two-microphone impedance tube. The theoretical values were close to the experimental value.
Impression evaluation of alert sound for electric vehicle based on fluctuation strength for amplitude fluctuation
Authors: YASUI Nozomiko
Published: October 2024

The motor sound on electric vehicle is quiet at low speeds. Thus, pedestrians have difficulty detecting those vehicles approaching them. Although the vehicle was designed to play an alert sound to solve this problem, it has not been solved yet. When the sound is designed, it should
be concerned not only detectability of approaching quiet vehicles but also impression of the sound. For pedestrians, it's important to make it easier to recognize quiet vehicle. Also, alert sounds shouldn't contribute to traffic noise annoyance. Previous studies found that acoustic characteristics
of amplitude fluctuation are effective to make them detect approaching vehicles. Here, this study evaluates impressions of those fluctuated sound, investigates relationship between the impression and those characteristics. The impressions of synthesized alert sounds that have periodic and
non-periodic amplitude fluctuations were measured by semantic differential method. The obtained data were analyzed by factor analysis. The results revealed that characteristic of amplitude fluctuation influences the factors of "familiarity".
On the use of the intermittency ratio for the assessment of aircraft noise during the night
Authors: KING Eoin , DUNLEAVY Conor , MANOHARE Manish
Published: October 2024

This paper explores the possibility of using the intermittency ratio as a novel metric for evaluating aircraft noise during nighttime periods. Using Dublin airport as a test case, the paper presents an analysis of nighttime flight patterns and corresponding noise data. It outlines the
limitations of using a simple Lnight indicator to capture the temporal variation of noise. Similar limitations are observed with the use of a Noise Quota System. It is proposed that such assessments should be complemented with additional indicators that consider how many noise events (and
noise induced awakenings) occur throughout the nighttime period. One indicator that has been suggested may be appropriate for use is the 'Intermittency Ratio', and as such this study investigates how the intermittency ratio might capture the temporal variations in noise emissions around Dublin
Airport. Results suggest that while the metric offers some additional insight into the acoustic climate in the environs of an airport, it is not (yet) suitable for distinguishing between scenarios that can yield similar Lnight values, but significantly different temporal changes. The findings
underscore the need to use additional indicators in the assessment of nighttime noise from aircraft.
A class of regularized adaptive multichannel equalization algorithms for speech dereverberation
Authors: QIU Zhimin , HE Hongsen , ZHOU Yingyue , LI Xiaoxia
Published: October 2024

The multiple input/output inverse theorem (MINT) is a typical speech dereverberation technique based on acoustic channel equalization. Although the adaptive MINT (A-MINT) method has been developed to meet the requirements of real-time application systems, its performance often deteriorates
due to the effect of the identification errors of room impulse responses (RIRs). In this paper, we present a regularized A-MINT approach to reduce the sensitivity of the adaptive equalizer to the RIR identification errors. According to the regularized MINT criterion, Newton's and quasi-Newton
methods are used to establish two adaptive speech dereverberation algorithms, respectively, which obtain faster convergent rate and better dereverberation performance. The effectiveness of the proposed algorithms is validated through numerical experiments with the RIRs measured in real acoustic
environments.
A review of vehicle speed measurement methods for the statistical pass-by noise testing
Authors: LO CASTRO Fabio , ARIZA ALVAREZ Maria Luisa , DE LUCA Massimiliano , IAROSSI Sergio
Published: October 2024

The Statistical Pass-By method (SPB, ISO11819-1) is used in environmental impact studies to evaluate, classify, and compare different road surfaces according to their influence on traffic noise. It relates the noise level to the type of vehicles and their speed. There are different
methods to measure vehicle speed and the cost plays a significant role in their practicality and widespread adoption. Radar, Lidar, and Photocells-based method systems typically involve higher initial costs due to the sophisticated technology employed, but they offer real-time and accurate
data, justifying their investment. On the other hand, Video camera systems may have lower initial costs, but their accuracy can be influenced by environmental conditions and calibration requirements. This paper will assess the cost-effectiveness of these technologies, considering not only
the initial setup expenses but also maintenance and operational costs over time. Cost-benefit analyses are crucial in determining the most economical yet reliable solution for specific budget constraints. As the research in this field progresses, a key focus lies in optimizing the balance
between cost and performance to make these systems more accessible and practical also for a wide range of applications, ensuring that advancements benefit both traffic management authorities and users alike.
Noise sensors - Part 1: Usage for the redesign of neighbourhoods
Authors: RUFF Andreas , SCHNEIDER Martin , DRECHSLER Andreas , ZEITLER Berndt
Published: October 2024

An interdisciplinary research project at the Stuttgart University of Applied Sciences with participation of the departments of urban planning, surveying and geoinformatics, business psychology and acoustics, present alternative urban scenarios. Different aspects for the redesign of
the district, especially measures to reduce the individual motorised transport, were investigated. Virtual reality and augmented reality experiments are used in public spaces, to show redesign possibilities. Surveys of people, who had the experience of the future scenarios via the AR application
and VR application, were carried out. Additionally, acoustical surveys and measurements in this research project were performed using so called noise sensors. These sensors based on MEMS microphones were developed for a simple and cost-effective measurement of external noise in a citizen sciences
project. The measurement results of the noise sensors are saved online and can be accessed on the homepage "Sensor.Community". One of the noise sensors was used in the project area over a longer period. Measurement values were generated in third octave bands at intervals of 5 s and
are available for further evaluations, e.g. for the calculation of indoor noise levels. The paper presents the research project and reports about the application of the noise sensor.
Gaussian distribution-based randomised image method
Authors: ANDRIJASEVIC Andrea
Published: October 2024

Sweeping echo is an acoustical phenomenon present in perfectly rectangular rooms that is characterised by a continuous increase in pitch arising from the concurrent arrival of multiple higher-order reflections. Even though the room acoustic simulation software predicts their presence,
in most rectangular rooms sweeping echoes can hardly be perceived due to the existence of small irregularities in the room geometry. In this paper, the image sources' position randomisation model developed within the randomised image method framework with which the incongruence between the
original image method results and in situ measurements can successfully be reduced is replaced with a Gaussian distribution model. The results indicate that with the proposed model an improvement in the stability of the room transfer function across realisations can be achieved.
Design of a multi-material acoustic black hole using geometric profile mapping
Authors: AUSTIN Beth , CHEER Jordan
Published: October 2024

Since their inception, acoustic black holes (ABHs) have taken on many forms. A wide range of profiles has been investigated for beam termination applications, including power laws and cosine profiles. However, all of these configurations have a common issue - the profiles have an inherent
thin section at the end of the beam. This makes the profile susceptible to damage towards the tip, particularly through fatigue. Multi-material ABHs have been proposed as an alternative solution, maintaining a constant external geometry whilst varying the material properties along the length
of the ABH termination. Previous work on multi-material ABHs has focused on optimising section lengths of each material based on a cost function, namely kinetic energy in the host beam. This work investigates the performance of multi-material ABH designs with section lengths chosen to approximate
the effective impedance change of a range of geometric ABH terminations. The relative performance of each discretised gradient is compared through simulation in addition to comparison to an equivalent continuous gradient.
Assessment of sleep effects at a hospital near Tan Son Nhat Airport, Vietnam
Authors: NGUYEN TRAN THI HONG NHUNG , TRIEU Bach Lien , NGUYEN Thu Lan , MORINAGA Makoto , MORIHARA Takashi , HIRAGURI Yasuhiro , YANO Takashi , SASAZAWA Yosiaki , DO Pham Nguyet Thanh , NGUYEN Thi Ngoc Dung , TRAN Quoc Viet , BUI Duc Thanh , TRAN Ha Hieu
Published: October 2024

This paper presents an analysis of sleep patterns and environmental noise levels recorded from 21 participants wearing smartwatches and 5 participants using ECG devices in patient rooms (A3) and outdoor areas on the 4th floor of an inpatient ward. Sleep data revealed variations in sleep
stages among participants, with an average distribution of 60% wake, 10% REM, 22% light, and 8% deep sleep. Environmental noise levels were measured at different times of day, showing higher levels during the day and lower levels at night, with an average LAeq of 53.4 dB for 24 hours. Comparisons
between indoor and outdoor areas and different times of day indicate fluctuations in noise levels, with outdoor areas generally exhibiting higher noise levels. These findings contribute to understanding sleep patterns and noise exposure in healthcare settings, highlighting the need for further
research to explore the impact of environmental factors on sleep quality and patient well-being.
Virtual validation of a Metro rolling-stock for exterior and interior noise in standard controlled conditions
Authors: DALMAGNE Clément , SAPENA Joan , CAMINAL BARDERI Rita
Published: October 2024

Validation of rolling-stock is a time and cost expensive task during the development of train. Replacing type tests by simulation (virtual validation) that fits the need of the complete railway industry in terms of accuracy and uncertainty, is possible in some cases. Simulation is widely
used by train manufacturers during development of new products with good accuracy of prediction in a controlled environment as free field and ballasted track. Methodologies available are able to predict correctly in controlled conditions (ISO 3095/3381) interior and exterior noise for different
operating conditions. In this paper, simulation cases will be presented for a standard metro product operating in controlled conditions. Simulations will be compared with experimental data for interior and exterior noise. Exterior noise modelling and propagation is done with analytical tools
while interior noise is modeled using an experimental-numerical (beam-tracing) approach. Input data for simulations corresponds to numerical models of rolling noise and measured sound power level of equipment. Validation of the models are discussed and analyzed to confirm the reliability of
virtual validation for rolling stock operating at controlled conditions. A proposal of a virtual validation approach based on uncertainties of the simulation is also discussed.
Characterization and estimation of the acoustical and elastic parameters in stone wool samples
Authors: BALLESTEROS VILLARREAL Maria Monica , BRUNSKOG Jonas , BOLBERG Mads , GLORIEUX Christ
Published: October 2024

Mineral wool is widely used in acoustic applications. The properties of glass wool have been broadly investigated, thus resulting in a good knowledge of its structure and parameters. This information is used to describe mineral wool in general. Nevertheless, other types, such as stone
wool, involve a different production process and therefore have a different fibre structure. e.g. stone wool is not transversally isotropic as glass wool. These differences can have important effects depending on the use of the material; therefore, assuming the same parameter values for both
materials may lead to inaccurate results in simulations and calculations. Currently there are few studies that characterize both the acoustic and elastic properties of stone wool. This contribution reports on the characterization of two stone wool samples with different densities (~70 kg/m3
and ~140 kg/m3). The characterization aimed at obtaining the parameters that are required for the description of the propagation of sound in the material through the Biot poroelastic model, i.e. the acoustic and elastic parameters. The obtained knowledge enables the adequate modelling of the
investigated poroelastic materials in different configurations by numerical methods such as finite elements and the transfer matrix method.
A vibroacoustic model for low-frequency sound transmission loss in circular membranes with added strip mass
Authors: RAJA JUSTUS Ajju , AKKOORATH MANA Anoop
Published: October 2024

Noise control strategies involve physical barriers in the transmission path. Conventional barriers conform to the mass law which states an inverse relation between sound transmission, barrier mass, and incident frequency. Practical scenarios for low-frequency noise attenuation require
prohibitively thick barriers making them infeasible. Mass-loaded membranes exhibit marked differences in their dynamic nature from that of bare membranes as they do not necessarily conform to the mass law. Being thin, compact, and lightweight makes them geometrically ideal for most applications.
The paper presents an analytical model based on the Newtonian approach for the vibroacoustic behavior of a pre-stretched elastic circular membrane with rigidly attached strip mass under normal incidence. The point collocation approach distributes the effect of the strip mass on the membrane
as a collection of discretized concentrated loads along the interfacial boundary resulting in a summation that is easier to solve. The peak and dip frequencies of sound transmission are determined for circular membranes with eccentric and central strip mass. The present study evaluates strip
mass-loaded membranes' capability to attenuate noise at low frequencies as an unconventional physical barrier.