bluuebunny/crossref_metadata_2025 huggingface dataset:
Transportation noise and cardiovascular health: an Umbrella+ review
Authors: ENGELMANN Nicole , VIENNEAU Danielle , RööSLI Martin
Published: October 2024

A significant number of studies have shown an association between transportation noise and cardiovascular diseases. With this Umbrella+ review, we aimed to provide a comprehensive overview of the literature on the relation between transportation noise and various cardiovascular health
outcomes such as ischaemic heart disease, stroke, heart failure, blood pressure and hypertension, as well as cardiovascular mortality. Following the Umbrella+ approach, we first identified the newest review of high quality and then original high-quality studies published thereafter. Further,
by including the latest studies we performed a meta-analysis to derive up-to-date exposure-response functions for each noise source (road traffic, railway and aircraft) separately. We found that compared to road traffic noise, less research was available for railway and aircraft noise. Regarding
road traffic noise, we identified a significantly increased risk for multiple cardiovascular health outcomes. For example, the pooled effect estimate for cardiovascular mortality was 1.05 (95% CI: 1.02-1.07) per 10dB(A) increase in noise, for the incidence of ischaemic heart disease it was
1.04 (95% CI: 1.02-1.06) and for stroke incidence 1.05 (95% CI: 1.01-1.08) per 10dB(A) increase in noise. This work will be used to quantify the burden of disease from transportation noise for the general population in Europe.
The method to determination of the utilization of thrust reversers after landing based on noise measurements and analysis of its results
Authors: SHINOHARA Naoaki
Published: October 2024

The use of powerful thrust reversers after landing often results in a noise impact on the area of surrounding the airport. The use of thrust reversers, while not necessarily a prerequisite for landing maneuvers, is sometimes a significant means of ensuring more safety for the pilot.
For this reason, the magnitude of the thrust reversers, and the segment of the runway in which the reversers are used, vary widely. We have established a method to determination of the utilization and the strength of reverse thrust from noise measurements taken at several stations along the
runway side. This report also describes an analysis of the results of the operational conditions of thrust reversers at a multitude of Japanese airports that were examined using the methodology.
Sound Source Localization at the Rolling Tire
Authors: NOWAK Jonathan , KALTENBACHER Manfred
Published: October 2024

A vehicle's tire rolling on pavement causes complex noise generating mechanisms which are a dominant sub-source of vehicle traffic noise. For the quantification of noise levels due to these tire-pavement interactions, standardized acoustic measurement methods exist, such as the Close-Proximity
(CPX) method. These methods require microphones mounted near a rolling tire. However, they do not provide insight in the distribution and amplitudes of present sound sources. In this contribution, we aim at identifying the dominant sound sources of the rolling tire at discrete frequencies.
This is accomplished by an inverse method combining microphone array measurements and Finite Element (FE) simulations. The microphone measurements were recorded on Austrian highways with a large measurement trailer built for research purposes. With the considered inverse method, not only the
amplitudes of the dominant sound sources but also their phases can be identified. With these identified sources and a validated FE model of the measurement trailer, the sound pressure field within the trailer may be computed. The thereby calculated sound pressure is compared to measurements
at the CPX microphone positions and other locations within the trailer.
Noise sensitivity: from systematic review to improving its measurement
Authors: MARQUIS-FAVRE Catherine , ELLERMEIER Wolfgang , ZIMMER Karin , SONG Eunsung , PARK Sang Hee
Published: October 2024

Noise sensitivity is known to be the most influential non-acoustic factor affecting noise annoyance. While there is general consensus within the international research community as to how noise annoyance should be measured, it is not true for noise sensitivity. Either single-item rating
scales are used or full-fledged questionnaires. Few of these instruments have been validated across different languages, and some of them have never been psychometrically evaluated. Even though noise sensitivity has been studied for many decades, there is no systematic review of what noise
sensitivity is. The present research program started out by conducting a systematic review of the instruments available to measure noise sensitivity. Next, an online survey will be carried out to evaluate and compare existing noise-sensitivity questionnaires on a large sample while considering
versions in different languages. Finally, on the basis of both the systematic review and the questionnaire evaluation, a resulting measure of noise sensitivity will be assessed in the laboratory by relating it to both noise annoyance and physiological measurements. The relevance of the proposed
work is thus to designate a reliable, yet economic method to measure noise sensitivity in future surveys. [Research funded by Fondation pour l'Audition (grant FPA RD-2022-6)]
Efficient compression of reduced impedance matrices for trimmed structural models: a novel methodology and industrial validation
Authors: ANDRADE PAIVA Andre Antonio , VAN DEN NIEUWENHOF Benoit , LIELENS Gregory , VERHAEGEN Julien , CHARBONNEAU Jeremy , KOLTE Kunal
Published: October 2024

In response to increasingly strict vibration and noise regulations, software frameworks such as Nastran and Actran have stepped up to the challenge, providing sophisticated solutions to efficiently model damping treatments within numerical methods. One of the available techniques is
the representation of trim components as frequency-dependent reduced impedance matrices (RIM) in a frequency response analysis of fully trimmed models. While RIM enables coupling between physical or modal-based components, challenges arise due to large dense matrices. Each matrix is reduced
either on physical coupling DOFs or modes of vibration of the component and stored on disk. Since each matrix is dense and large in industrial models, it leads to storage and efficiency issues related to computational and input/output (I/O) operations. This paper introduces a methodology to
compress RIMs, particularly for modal components, by selecting the most contributing modes to represent the coupling relationship of each surface. Numerical results on an industrial car body model demonstrate that this approach effectively eliminates low-effect contributions, minimizes storage
requirements, and reduces computational time. General Motors' involvement in validating the method adds real-world applicability and reliability to the findings, enhancing its practical engineering value.
Designing for sonic citizenship in Danish nursing homes
Authors: KOLDKJæR HøJLUND Marie , SISSEL RAAHEDE Lundgård
Published: October 2024

With the aim of improving the soundscape in Danish nursing homes, this paper explores how a sonic citizenship perspective can be unfolded and discussed through a design-oriented research approach. Based on the experiences from an intervention study we argue that this perspective is
important in expanding the focus further than formulating final solutions and making citizens proactive beyond the transformation phase. Building on thorough analysis of 45 nursing home soundscapes various interventions were implemented in 8 nursing homes from 2022-23. Evaluation of the interventions,
through a mixed-method study, showed major improvements in perceived soundscape assessment. Through interventions that attenuate unwanted institutional sounds and introduce positive sound experiences, a better balance is found between foreground and background sounds, increasing the appropriateness
of the soundscapes. The assessment also showed how the improvement of the soundscapes is closely connected to the engagement and behavioral changes of the staff and how they attune themselves to the soundscape. In that regard, the authors wish to emphasize the importance of anchoring soundscape
interventions in the culture, and routines of the people being and living in the environments, to make sustainable changes in an environment and empower staff to become sonic citizens.
Exploring the current landscape of open research software in room acoustics
Authors: HORNIKX Maarten , WANG Huiqing , FICHERA Ilaria , PAGANINI Lavínia , NOLTE Alexander , SEREBRENIK Alexander
Published: October 2024

Over the span of six decades, researchers have dedicated considerable efforts towards the development of computational methodologies for predicting room acoustics. These methodologies comprise the calculation of detailed impulse responses, frequency responses, and the prediction of
quantities and indicators. The classification of these computational approaches continues to evolve, particularly with the recent integration of machine learning methods into the realm of room acoustics. Notably, the research software or code underpinning these advancements is not as readily
accessible to the public as the results it has generated. This lack of accessibility has posed challenges to reproducibility and potentially impacted the overall quality of scientific endeavors as well as hampered collaboration, hindering the progress within the field. This study provides
insights into the current state of open room acoustics research software, presenting quantitative developments over the years. It further explores the measurable impact of shared research software and offers an outlook on the prospective value of open research software in room acoustics.
Automotive powertrain electrification: system methodology to guarantee acoustic comfort
Authors: MAHE HERVE , MAGNE Stephan , PITCHAI Guruparan
Published: October 2024

For the past few years, electrification has disrupted the automotive industry. Surprisingly, Noise Vibration and Harshness (NVH) became a major issue as it is located in high frequencies (1 to 5 kHz). The noise has 2 origins: the electromagnetic forces in the electric motor and the
gear mesh forces in the reducer. The first part focuses on the methodology developed in collaboration with car-makers in order to integrate the powertrain in a satisfying way in the vehicle. First, this process is focused on the structure-borne noise. Attention is paid on rubber mounts and
on their fixation points. Second, the airborne transfer may become an issue. Despite the acoustic power requirement provided, the final vehicle performance is not guaranteed. Examples will illustrate these important topics. The second part pays attention to the prediction of reducer noise.
Automotive stakeholders are approaching the gear mesh source by approximate linear tools. Recent works have shown that this methodology has limitations and leads to inaccurate results. This may be a major concern. A few examples will illustrate this risk and show that further simulation developments
are necessary.
Study on near-field noise control of stationary equipment
Authors: LIU Qiang , KANG Zhongxu , WANG Beibei , ZHANG Hougui , ZHANG Huijuan
Published: October 2024

The noise of stationary equipment is usually controlled by the sound insulation shield with the mufflers. However, there is not enough space for the installation of the sound insulation shield in certain places or working conditions, so the noise reduction measures are difficult to
apply. The noise control measures at the near-field of stationary equipment, especially those infinitely close to the surface of the equipment, can solve the problem of insufficient installation space. At this time, it is necessary to design a structure of noise control measures to ensure
that it have sufficient noise reduction performance. In this paper, a noise reduction structure is designed for near-field noise control of stationary equipment. The experimental results show that the structure have a good noise reduction effect in the certain frequency range. The effective
noise reduction frequency can be specially designed according to the frequency characteristics of different sound sources. In addition, a modular installation structure was designed.
Vibration reduction of an electric vehicle heat exchanger by controlling the polarization of its ferroelectric ceramics
Authors: MAURIN Lionel , DURAND-TEXTE Thomas , GOUDé Sébastien , BRICAULT Charlie , PELAT Adrien , GAUTIER François
Published: October 2024

The growing requirements in terms of CO2 emissions reduction in transports renders necessary the development of new electric traction technologies. This results in new technical constraints for equipment manufacturers, forcing them to reduce the acoustic emissivity of their new products
inside and outside vehicles. Heat exchangers for electric cars are part of this new product category. High voltage supplied by the battery of electrical vehicles requires introduction of a new energy conversion process and technology. To this end, components based on ceramics containing barium
titanate (BaTiO3) with high electrocaloric coupling properties are selected to provide the heating function. Baryum titanate is ferroelectric. This category of materials is subjected to piezoelectric and electrostrictive effects. The vibrations induced in the components (rods) containing the
BaTiO3 ceramics are transmitted through the system, and cause undesired acoustic radiation. This coupling is a suffered effect and is not taken into account in the integration process during the rods manufacturing. In this study, an experimental characterization is proposed to identify the
involved electromechanical coupling coefficients. Numerical simulations of the vibrations induced by BaTiO3 are carried out and used to study the possibility of attenuating them by controlling the polarisation of the ceramics or by geometric modifications.
Optical interferometry implementation considerations for sinusoidal low frequency accelerometer measurements and calibrations
Authors: KOUKOULAS Triantafillos , WU Lixue , HODGES Timothy , ST-GELAIS Raphael , DOYON D'AMOUR Francis , STEPHAN Michel
Published: October 2024

Vibration metrology utilizing sine excitation stimulus, based either on fringe counting or minimum point methods, employs Michelson interferometers for the calibration of accelerometers. The former method combines the optical reference and measurements arms from a static mirror and
reflected by the accelerometer respectively which are then directed to a suitable photodiode for processing. The stroking motion due to the oscillation of the accelerometer will contribute to the misalignment of the two optical paths and there are three methods to compensate for this. The
first requires the mounting of a mirror on the accelerometer itself and the effect of the added mass from the mirror can be accounted for and corrected. The second requires the mounting of three mirrors on the mounting surface of the accelerometer but this requires the alignment of the Michelson
interferometer for each mirror. The third is to use two retro reflectors so that the returning measurement beams are always along the same path with the reference; however, this requires the alignment of the interferometer for each retro-reflector. This paper will discuss such considerations
on the optical systems, their components and associated instrumentation and discuss the design of an alternative approach that can overcome certain limitations.
Generating a virtual acoustic environment to approximate the soundscape of a historical cathedral
Authors: PARK Sang Bum
Published: October 2024

This paper focuses on the generation of a virtual acoustic environment of a historical cathedral basilica located in St. Augustine, Florida, USA. The virtual acoustic environment is an effective means to study a cultural heritage's soundscape that restricts visitors from accessing and
being quiet. The author used a laser scanner to capture the reality of the cathedral's interior, in order to maximize the visual perception of the worship space, and created a 3D digital textured mesh model using the points cloud generated from laser scanning. The spatial experience recorded
by a 360 camera with an ambisonic microphone provided the virtual soundwalk at multiple locations. The background and foreground sound were synthesized in Unity using the same music recordings that the church used during the day. The sound pressure levels were closely matched with the ones
measured by a sound level meter. The virtual acoustic environment was simulated by using spatial applications in Unity and optimized through the comparison of the room acoustical measurements performed based on ISO 3382.
Reconstruction of directional sources using physics-informed neural networks
Authors: MORENA Edoardo , MALVERMI Raffaele , PEZZOLI Mirco , ANTONACCI Fabio , SARTI Augusto
Published: October 2024

In the context of augmented/virtual reality applications, replicating the directivity of sound sources is a critical step to ensure a high-quality immersive experience. However, accurate directivity measurements require complex experimental procedures involving a high number of microphones.
In these scenarios, spatial interpolation allows to reconstruct the sound field with fewer sensors, which can be sparsely distributed around the source. The literature offers several interpolation schemes for sound field reconstruction, although they exhibit limited accuracy due to the lack
of knowledge on the underlying physics. Recently, Physics-Informed Neural Networks (PINN) have been used to directly solve partial differential equations and thus better predict the evolution of dynamical systems. In this manuscript, we propose a spatial interpolation scheme based on PINN
for the reconstruction of sound source directivity. PINN are used to solve the Helmholtz equation starting from acquisitions of the directivity over a limited set of sparsely distributed points. Results are compared with the outcomes of well-established methods based on Spherical Harmonics
Decomposition (SH), Thin Plate Pseudo-Splines Interpolation (SPLI) and Piece-wise Linear Spherical Triangular Interpolation (TRI). PINN prove to provide better reconstruction of the directivity with respect to the proposed comparison methods, even when dealing with highly sparse sampling grids.
Unequal segment areas and corner positions with the enveloping surface method for sound power determination
Authors: WITTSTOCK Volker
Published: October 2024

The standardised methods for the determination of the sound power level according to the enveloping surface methods require a measurement of the sound pressure or sound intensity level on the enveloping surface. While the subdivision of the enveloping surface into unequal segment areas
is correctly standardised for the intensity method (ISO 9614, all parts), the sound pressure methods (e.g. ISO 3744) reveal some fuzziness. The reason is the necessary allocation of partial surfaces to measurement points which are normatively located at corners or edges of the parallelepiped
measurement surfaces. This effect is especially important with the proposed local increase of the measurement point density in regions of increased sound radiation. The contribution shows which effects unequal areas have and how a correct surface averaging can be implemented in these cases.
A sound insulation prediction tool and LCA: A comparative study considering different wooden assemblies
Authors: BADER EDDIN Mohamad , MéNARD Sylvain , LARATTE Bertrand , LE TYRANT Karin , DE PONTEVES Caroline
Published: October 2024

This paper aims to develop an acoustic design methodology for CLT floor assemblies using artificial neural networks approach by integration of life cycle assessment (LCA). 72 Lab-based measurements are used to develop the acoustic prediction tool. They are related to 29 different CLT-based
floor assemblies. The weighted sound reduction index (Rw), and the weighted normalized impact sound pressure level (Ln,w) are estimated with an accuracy of 2 dB. Then a LCA study is conducted on assemblies that are used to test the network model. The acoustic performance and their environmental
impacts are compared to highlight trends that may guide decision-makers in the design phase. This paper initially found that CLT-based floor assemblies generally increase the environmental impacts to achieve better acoustic insulation. However, a good sound attenuation can be reached by selecting
suitable acoustic solutions.
A causal model for acoustic assessment of informal learning environments
Authors: SAHIN OZTURK Zekiye , YILMAZER Semiha
Published: October 2024

Irrelevant and intelligible speeches are the most effective distractive noise sources in open-plan environments. They are inevitable in informal learning environments as group assignments are very common. Informal learning can be defined as any additional learning activity that takes
place outside the classroom and is conducted individually and collaboratively on campus. This study will examine the impact of sound-absorbing materials on students' attention in informal learning environments in a causal manner. To examine the effect of materials, 3D models will be designed
by changing the sound-absorbing materials, using reverberation time as a reference metric by applying the auralization process. The control and treatment models will be provided. The statistical significance of the impacts will be investigated using pairwise correlations, ANOVA, and multivariate
regression methods.
An application of aircraft noise metrics to the Artemis-I launch
Authors: COYLE Whitney , GEE Kent
Published: October 2024

In aerospace and acoustical research, there has been significant focus on understanding the negative effects of noise from jet aircraft and flyover vehicles. However, there has been relatively little investigation into the specific noise impacts of launch vehicles. Despite a considerable
rise in the number of launches from various spaceports globally in the past decade, there appears to be poor understanding of the potential harm these increasing launches could pose to nearby communities, including both humans and wildlife. This paper aims to apply established noise metrics
such as overall sound pressure level, sound exposure level, and effective perceived noise level, commonly used in aircraft policy, to quantify the potential noise impact of launch vehicles, using measurements from the Artemis-I mission as a case study.
Accuracy for aircraft noise identification model generalized by applying swarm learning
Authors: MORI Junichi , MORI Junichi , KODOMARI Funa , TSUCHIYA Takenobu , MORINAGA Makoto , YAMAMOTO Ippei
Published: October 2024

To conduct detailed studies on aircraft noise and manage noise maps around airports, it is necessary to measure aircraft noise under various conditions. In such measurements, it is necessary to obtain not only the noise signals but also information that identifies the noise, such as
the type of aircraft and flight mode, and so on. To automate this measurement, we have been developing a technique for identifying aircraft noise using machine learning based on measured acoustic information. To enhance the generalizability of this technique, it is necessary to create an integrated
model by accumulating aircraft noise data measured by various organizations. However, this type of information is subject to strict security and involves a large amount of data. To solve this problem, we applied Swarm learning, which accumulates only the weight information learned by machine
learning in each organization, to create an integrated model. We compared the accuracy of models within each organization, models trained with the accumulated data from all organizations, and models that integrated only the weights extracted from each organization's model using Swarm learning.
As a result, the models using accumulated data and those using Swarm learning had almost the same accuracy.
An applicability discussion of the in-situ measurement method using the ensemble averaging technique for sound absorption characteristics
Authors: OTSURU Toru , TOMIKU Reiji , OKAMOTO Noriko
Published: October 2024

In our former papers, the authors have proposed a measurement method for sound absorption characteristics, surface impedance and sound absorption coefficient, of materials using the ensemble averaging technique. We named it EA-method, for short. So far, we have shown the robustness
as well as the reproducibility of the results obtained by the method at various environments. The method consists of two kinds according to sensor types employed: i.e. two-microphone and PU-sensor. In this paper, the applicability of the EA-method is discussed onto three types of absorption:
porous, panel, and resonator. At first, the outline of the EA-method is summarized and measurement mechanism is explained. Then, the robustness as well as the reproducibility of the method are discussed based on accumulated results of measurements conducted in various environments including
reverberation rooms and in-situ conditions.
Rainbow trapping and piezoelectric energy harvesting of flexural waves in a gradient metamaterial waveguide
Authors: WANG Kai , FAN GuangTeng , QIN Jiang Yi , RAN De Chao , JI Ming Jiang , ZHANG RuiChen
Published: October 2024

Metamaterials have provided a new way of controlling classic waves to achieve applications in space. In this work, we construct the gradient waveguide in two-dimensional elastic metamaterial plate to achieve rainbow trapping of flexural waves and then realize piezoelectric energy harvesting.
Based on the band gap of flexural waves, the waveguide is formed by the introduction of line defects into the perfect metamaterial plate. The gradient waveguide is designed through the investigation of dispersion curves of guided waves for different geometrical parameters. The elastic flexural
waves at different frequencies in the gradient waveguide separate, stop and hence are amplified in different positions. That is, the rainbow trapping is observed. To convert mechanical energy into electrical energy, piezoelectric patches are attached in the proposed metamaterial waveguide.
Compared with a reference harvester (i.e., a homogeneous plate without metamaterial structure), the output power from the metamaterial energy harvester is significantly amplified. Besides, the proposed metamaterial harvester exhibits the capacity of multi-frequency energy harvesting.
LCV Vehicle in-cab noise prediction and reduction using SEA based simulation approach
Authors: YADAV Prasad , BANKAR Harshal , WALKE Nagesh
Published: October 2024

With increase in consumer demand vehicle OEMs are developing quieter vehicles at a design stage using acoustic simulation tools to reduce development cycle times avoiding costly proto builds and test iterations. Present work describes application of statistical energy analysis (SEA)
simulation approach for in cab noise prediction and noise reduction through sound package optimization for LCV vehicle. In first step complete vehicle in-cab SEA model is prepared with baseline sound package concept. It consists of comprehensive definition of structural panels, interior and
exterior cavities. Noise control treatment is modelled as multi-layer poro-elastic materials. Airborne noise excitations for sources engine, transmission, intake and exhaust muffler are applied. Source strengths for above sources were derived from dyno-coupled powertrain noise tests in the
anechoic chamber. Load case of rated speed was considered neglecting tire and wind noise during simulation. Contribution analysis was carried out to find out sensitivity of different panels on interior noise at various frequencies. It was observed that bottom middle floor panel and rear glass
panel were major noise contributors. Noise mitigation was carried out by optimizing floor panel sound package and intake air filter within given space constraints. These modifications resulted in overall 2 dB in-cab noise reduction
Basic examinations of the sound transmission loss measurement using two cardioid microphones
Authors: SATO Ayame , ISHIZUKA Takashi , HOSHI Kazuma , SUZUKI Ryoichi , HANYU Toshiki
Published: October 2024

This paper reports results of an experiment on sound transmission loss measurement using the C-C method. This method is an inexpensive and stable method for measuring the sound pressure, the particle velocity, and the sound intensity. The measurements are carried out in accordance with
JIS A 1441-1:2007 based on ISO 15186-1:2000, and the C-C method is applied for measuring the sound intensity. Comparing the measured results with those of the sound pressure level difference method, comparable results are obtained above 250 Hz. Naturally, the precision of the measurements
depends on the microphone calibration used in the C-C method. In this report, we employ two calibration methods using an acoustic tube and an anechoic chamber, and also exhibit comparison of the results obtained by these methods.
Road traffic noise prediction model "ASJ RTN-Model 2023" proposed by the Acoustical Society of Japan -Part 3: Case studies of prediction accuracy on Japanese highways and roundabouts
Authors: YAMAUCHI Katsuya , ANAI Ken , ITIKI Tomoyuki , FUKUSHIMA Akinori , OKADA Yasuaki , SAKAMOTO Shinichi , YOKOTA Takatoshi , MAEDA Naoto , IKEYA Kimikazu
Published: October 2024

The Acoustical Society of Japan (ASJ) has published a new version of road traffic noise prediction model "ASJ RTN-Model 2023" this April. Some case studies of the prediction accuracy, namely the correspondence between the predicted and measured value, using the new model is
presented in this paper, as one of the three papers with same main title in this congress. The case study on Japanese highways was examined using the measurement at the straight sections. The LAeq at the measurement point was calculated using obtained traffic data for each lane and the age
of pavement. The mean difference between predicted and measured LAeq were less than 3 dB. The case study at the vicinity of roundabouts was also examined using the prediction method newly introduced in the ASJ RTN-Model 2023. The case measurements were conducted at two round abouts in Japan,
and the predicted LAeq corresponded to within 3 dB of the measured values.
Interlaboratory comparison of ISO 354 sound absorption coefficient measurements for four sound absorbing materials
Authors: PRISLAN Rok , PULJIZEVIć Maro
Published: October 2024

Sound absorption coefficients are among the most important acoustic parameters of building materials. The coefficients are measured in reverberation chambers using the ISO354 measurement procedure. The complex reverberant sound field that builds up in such facilities is closely related
to the concept of the diffuse sound field and is difficult to characterize experimentally. Due to the limited quantitative assessment of the sound field, there is no general agreement in the scientific community on how to improve the method of measuring sound absorption coefficients, although
significant differences have been reported between the results of different laboratories. To address part of this challenge, we investigate how specific the variations between laboratory results are for a particular material. In our investigation, we evaluated four different sound absorbing
materials in five independent acoustics laboratories. Four of the reverberation chambers used suspended diffusers, while the complex shape of one chamber was designed to achieve a diffuse sound field. The results show that the interlaboratory deviations are not very specific to the material
tested, while general differences between the facilities can be observed. Furthermore, the meticulous geometric design of the chambers can be seen as an alternative to the use of suspended diffusers.
A fundamental investigation on the sound absorption characteristics of acoustic meta-surface type baseboards
Authors: CHIKUMA Isshin , SUGAHARA Akiko , HIRAGURI Yasuhiro , KAJIMURA Kohei , TAKEDA Naoki , UEMATSU Narumi
Published: October 2024

The sound of footsteps generated in corridors propagates into surrounding spaces, sometimes becoming a problem of noise pollution. Therefore, the aim of this study is to reduce footstep noise by incorporating sound absorption mechanisms into the baseboard of corridors. We focus on the
acoustic metasurface that has gained significant attention in recent years in order to absorb a relatively wide range of frequencies. In this study, we proposed acoustic metasurface type baseboards by utilizing multiple resonators with different resonance frequencies. The proposed models feature
parallel arrangement of multiple resonators with straight or inclined slits. The absorption performance of these models is evaluated through theoretical analysis, numerical simulations, and experiments. Results suggest that acoustic metasurface type baseboards is found to be able to absorb
the dominant frequencies in the sound of footsteps. In addition, increasing the number of resonators and incorporating slanted perforations in the neck contribute to improved absorption performance. Furthermore, the possibility of thinning the models through slanted perforations is also suggested.
Validation study on road traffic noise: assessing various traffic scenarios
Authors: SCHALCHER Stefan , WICKI Benedikt , WUNDERLI Jean-Marc , RööSLI Martin
Published: October 2024

TraNQuIL2 is an epidemiological research project, which addresses the relation of acute and long-term health effects from transportation noise and the benefit of different mitigation strategies. Within this project, a small validation study on the exposure modelling for various road
traffic noise situations in both rural and urban areas of Switzerland was carried out. The study focuses on evaluating the accuracy of the emission and the sound propagation modelling to nearby buildings and aims at identifying potential exposure misclassifications. Results indicate a tendency
of the model to overestimate actual source emissions (mean: +1.5 dB), which might be explained by lower actual travelling speeds or different pavement properties compared to model assumptions. As the sound propagation modelling yielded accurate results, this leads to a corresponding overestimation
at exposed facades. However at facades facing away from the street, larger uncertainties in the propagation calculation and a tendency to overestimate the attenuation was observed, highlighting the complex nature of sound propagation in such situations. These findings emphasize the importance
of using refined emission and sound propagation models and accurate input data for noise effect studies.
A view on distributed sound level sensors from the perspective of legal metrology
Authors: CIESLAK Michal , KLING Christoph , BECKMANN Björn , RUST Marvin
Published: October 2024

Paper-based calibration certificates are gradually being replaced by equivalent digital calibration certificates (DCCs). The DCC is human-readable as well as machine-readable which simplifies the administration process significantly. During calibration procedure a measurement instrument
is tested on-site in a testing laboratory. However, nowadays sound level sensors are increasingly deployed as distributed systems, where they transmit measurement data from one location (e.g. a workplace in a factory) to a measurement laboratory over available networks. This data transmission
process has until now not been considered during calibration procedure or type approval tests. Therefore, requirements for the data transmission process according to the regulations of the European Cooperation in Legal Metrology (WELMEC Guide) must be considered. In this project two digital
sound level sensors were selected and tested when deployed as distributed systems. The data collected were used to compare the two systems in accordance with the regulations of the WELMEC guide. In this work the first example of an acoustical DCC is presented and discussed. Further, a list
of requirements is proposed that should be considered in the future when developing sound level sensors intended to be used as distributed systems.
The importance of different body parts for the (un-)pleasantness of whole-body vibration on an aircraft seat bench
Authors: TöPKEN Stephan , KRAUSE Louis , VAN DE PAR Steven
Published: October 2024

Noise and vibration are two physical factors that can reduce the perceived comfort of passengers during a flight. To reduce the detrimental impact of seat transmitted vibration, it is necessary to understand which body parts and, thus, which corresponding seat parts are relevant for
the pleasantness assessment. In this study, 40 participants (19 female, 21 male) rated the pleasantness of sinusoidal whole-body vibrations in the vertical direction while seated on a typical aircraft seat bench and listening to a synthetic broadband aircraft cabin noise over headphones. The
vibration signals covered seven frequencies and four vibration levels, and pleasantness ratings were made on a verbally anchored scale. In addition, the participants separately marked those body parts that contributed significantly to their rating and those where they felt a vibration for
each of the vibroacoustic stimuli. The results showed that not all body parts at which vibration were felt were also classified by the participants to reduce the ratings significantly, especially at higher vibration levels. A median split of the participants into groups of lighter and heavier
participants indicates which body properties might be underlying factors for certain judgments.
Research on the effects of railway noise and biaxial vibration on calculation disturbances
Authors: MORIHARA Takashi , MATSUMOTO Yasunao , YOKOSHIMA Shigenori , HAYASHI Kentaro , FUJISAWA Riku
Published: October 2024

This study conducted an evaluation experiment on simultaneous exposure to noise and two-axis vibration stimuli from railways, using noise stimuli from railways and two-axis vibration stimuli in the horizontal-vertical direction, and verified differences in evaluation of interference
due to differences in noise and the direction of vibration. The experiment was conducted in a laboratory with a vibration exciter placed in a simple anechoic chamber, with the participation of 20 students. The stimuli presented utilized vibrations recorded indoors and sounds recorded outdoors.
Both vertical and horizontal vibrations were presented in four levels, and the sound stimuli were presented at three levels: 50, 60, and 70 dB. The evaluation of annoyance and interference showed that under conditions of noise levels of 50 dB and 60 dB, discomfort and interference increased
as the vertical vibration level increased with horizontal vibration levels (X: 2-6), confirming the combined effect of vertical vibration and noise. Even under conditions of a noise level of 70 dB, except for vibration conditions X: 2, Z: 2, and X: 6, Z: 6, the combined effect of vertical
vibration and noise was confirmed.
Measurement of sound perception to improve the performance of military ships
Authors: REGNIEZ Margaux , CELLI Laetitia , POITTEVIN Julien
Published: October 2024

The performance of military ships relies on the performance of equipment and operators. Acoustic performance of military ships consists of: - the acoustic discretion of the vessel, allowing a strategical advantage in the event of a threat (more specifically: noise and vibrations management
of ship sources); - the acoustic comfort of the operators in the ship, allowing better oral communication, better perception of safety alarms and a better focus. These effects can reduce time loss, and prevent operators from making errors. It is therefore important to manage the acoustic environment
on board throughout the design process, in order to ensure both the acoustic discretion of the ship and the performance of its operators on board. For several years, Naval Group is interested in optimizing the performance of the operators, coupling both acoustic and visual perceptions through
virtual reality (VR). This congress is an opportunity to expose recent works on acoustic perception in a ship. Our results are based on both numerical simulations and experimental measurements.
A review of the surveys on health effect of aircraft noise for Narita International Airport
Authors: HIROE Masaaki , MAKINO Koichi , IWANAGA Keiichiro , KOBAYASHI Tomohiro
Published: October 2024

In this paper, we review two previous projects on health effects of aircraft noise for residents living around Narita International Airport, and introduce a summary of the new project which started since 2019. The airport was equipped with a Runway‐A at the opening, and a Runway‐B
was constructed to keep pace with increased demand for air transport in 2002. The Runway‐C will be accomplished at the end of fiscal year 2028. The first project on health effects of aircraft noise was conducted in 1998 when the airport had only Runway‐A. And then, second project
on health effects of aircraft noise was conducted in 2014 after beginning of conditional relaxation of curfew. These two projects were based on cross‐sectional study, and implemented using a questionnaire to investigate psychological effects like noise annoyance, night‐time insomnia,
mental effects like emotional instability and depressive tendency, and physical effects like high‐blood pressure. Since 2019, third project on health effects have been started because of disestablishment of nighttime flight restrictions for the Runway‐A. In this new project,
longitudinal data are also included and we have a plan to investigate using objective method. The progress of this project until 2022 is reported in this paper.
The role of noise as part of neighborhood quality and its impact on well-being in German preschoolers: Results from the Equal-Life project
Authors: LEIST Larissa , BELKE Christin , KUHLMANN Julia , BENZ Sarah , HABA Alexia-Ioana , SCHRECKENBERG Dirk , SPILSKI Jan , LACHMANN Thomas , KLATTE Maria
Published: October 2024

Current research confirms the significant role of environmental quality in children´s well-being and mental health. Respective studies targeting young children focused on characteristics of the families´ immediate housing situation, e.g., household chaos. In the framework
of the Equal-Life project, we investigated the relationships between neighborhood quality and mental health in preschoolers (N=111). Data were acquired through parent questionnaires. Stepwise regression analysis identified noise and air pollution as the most important predictors of overall
neighborhood quality ratings. As expected, different components of neighborhood quality were significantly correlated, confirming a gap between favorable and unfavorable conditions in children´s environments. All components of neighborhood quality were significantly associated with children´s
well-being (KIDSCREEN-10), but stepwise regression analyses identified noise and air pollution as the most important predictors. In contrast, children´s mental health problems (Strength and Difficulties Questionnaire) were unrelated to all components of neighborhood quality. Furthermore,
lower neighborhood quality was associated with higher parental stress, which in turn was a significant predictor of children´s mental health problems and well-being. These findings underline the interdependencies of psychosocial and physical exposures, and thereby the necessity to adopt
an holistic (exposome) approach in order to design environments that foster children´s mental health.
Quantitative measurements of lightweight timber floors using low-frequency impact source; analysis of the accuracy of 1/3 octave band heavy-hard impact prediction modelling in lightweight structures
Authors: PATZKE Tim
Published: October 2024

This paper analyses heavy weight drops on lightweight structures such as timber frame and mass timber, with particular emphasis on the accuracy of the 1/3 octave band heavy-hard impact prediction modelling. With the increasing popularity of lightweight structures such as mass timber,
timber frame and steel frame, this research investigates the behaviour of lightweight slabs when free weights such us kettlebells are dropped on fitness flooring. A comparison of the spectral shapes of various base structures has been carried out, focusing on the low-frequency range and resonance
of various base structure types. Third-party laboratory data is utilised to derive design recommendations when free weights or heavy hard impacts are proposed in lightweight structure developments. Previously, the author carried out a case study in the UK which demonstrates the accuracy of
the 1/3 octave band prediction model for concrete developments using force pulse data collected at the in-house drop tower. While the prediction method shows good agreement for concrete buildings up to 200 Hz, there is interest in extending the range for use in lightweight structures.
Underbody contribution simulation for vehicle wind-noise
Authors: MORDILLAT Philippe , ERRICO Fabrizio , ZERRAD Mehdi
Published: October 2024

Wind noise is one of the largest sources to the interior noise of modern electric and hybrid vehicles. This noise is encountered when driving on roads and freeways and generate considerable fatigue for passengers on long journeys. Aero-acoustic noise is the result of turbulent and acoustic
pressure fluctuations created within the flow. They are transmitted to the passenger compartment via the vibro-acoustic excitation of vehicle surfaces and underbody cavities. Generally, this is the dominant flow-induced source at low frequencies. The transmission mechanism through the vehicle
floor and underbody is a complex phenomenon as the paths to the cavity can be both airborne and structure-borne. This study is focused on the floor contribution to wind noise of different type of vehicles, whose underbody structure are largely different. Aero-Vibro-acoustic simulations are
performed to clarify the transmission mechanism of the underbody wind noise and contribution. The external fluctuating pressure fields are simulated using computational fluid dynamics based on the Lattice Boltzmann Method (LBM). The vehicle exterior and interior vibro-acoustic coupling and
transmission are simulated using subsystems modeled by the finite-element (FEM) or boundary element methods (BEM). The analysis results are discussed and a contribution analysis is proposed to identify potential improvements.
Comparison of sound insulation performance between closed-cell foam and automotive carpet
Authors: NAKANO Sachito , TOMITA Sunao , ARITA Shoko , SHIMANUKI Kento , KAZUHIKO Umemoto
Published: October 2024

In developing sound insulation materials for automobiles, multiple sound insulation and sound absorption materials are laminated to achieve high performance. Generally, steel sheets, needle felts, and carpets are used to create sound insulation properties. In a luxury car, multiple
layers with sound absorption and sound insulation properties are placed on the carpet to add higher sound insulation properties, but this increases the mass of the carpet. To solve this problem, we are investigating the the potential to realize both lightweight and high sound insulation properties
using closed-cell form. In this study, we experimentally evaluated the sound transmission loss of closed-cell foam by comparing it with those of carpets with the same configuration used in standard and luxury cars.Furthermore, a numerical study is conducted. As a result, the closed-cell foam
obtained higher sound transmission loss than the automobile specification carpet in a wide frequency range from 400 Hz to 5000 Hz. On the other hand, the sound transmission loss decreased by the same degree for both the automotive carpets and the closed-cell foam at 250 Hz.