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Journal articles on the topic 'Mitigation acoustic noise reduction'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Sahu, Ashish Kumar, Abeka Selliah, Alaa Hassan, Moien Masoumi, and Berker Bilgin. "Experimental Evaluation of Acoustical Materials for Noise Reduction in an Induction Motor Drive." Machines 12, no. 8 (2024): 499. http://dx.doi.org/10.3390/machines12080499.

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Electric propulsion motors are more efficient than internal combustion engines, but they generate high-frequency tonal noise, which can be perceived as annoying. Acoustical materials are typically suitable for high-frequency noise, making them ideal for acoustic noise mitigation. This paper investigates the effectiveness of three acoustical materials, namely, 2″ Polyurethane foam, 2″ Vinyl-faced quilted glass fiber, and 2″ Studiofoam, in mitigating the acoustic noise from an induction motor and a variable frequency inverter. Acoustic noise rates at multiple motor speeds, with and without the a

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2

Azimi, Mariam, and Mohammadreza Azimi. "Noise Mitigation in Buildings Using Sound Absorbing Materials." NOISE THEORY AND PRACTICE 1, no. 1 (2015): 12–16. https://doi.org/10.5281/zenodo.1469408.

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Noise, generally defined as undesirable sound, is characterized in terms of the pressure of the sound wave. The improvement on the human quality of life and the continuous growth in population in developing and developed societies, have exacerbated the environmental and financial issues. Some of these problems are noise and the different types of human an industrial wastes. Many natural products have been recently developed and tested for acoustic applications. Sound-absorbing materials absorb most of the sound energy striking them and reflect very little. Therefore, sound-absorbing materials

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3

Yun-Ke, Luo, Song Li-Zhong, Zhang Chao, and Ni Yi-Qing. "Experimental evaluation and numerical interpretation of various noise mitigation strategies for in-service elevated suburban rail." Measurement 219, no. 2023 (2023): 113276. https://doi.org/10.1016/j.measurement.2023.113276.

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This research evaluates the efficiency of five noise mitigation measures including rubber floating slab track, straight noise barrier, track acoustic absorber, track-side noise barrier, semi-closed noise barrier, and a combined strategy on an elevated railway through in-situ measurements. In-situ experiments were conducted by sequen- tially installing various mitigation measures for comparative evaluation. A numerical model was then developed to interpret the noise control characteristics of the mitigation measures. The experimental results indicate that the rubber floating slab track can miti

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4

Jarnut, Marcin, Jacek Kaniewski, and Mariusz Buciakowski. "Review on Noise Generation Issues and Noise Mitigation Methods in Electric Vehicle Charging Systems." Energies 18, no. 4 (2025): 778. https://doi.org/10.3390/en18040778.

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This paper presents an overview of issues related to noise generation in electric vehicle (EV) charging systems. It discusses the requirements for noise reduction in locations where charging stations are most commonly installed. The primary sources of noise in EV charging stations are identified, considering their design and configuration. The results of acoustic tests for specific noise sources and entire charging stations are presented, including measurements of sound pressure level (SPL), acoustic imaging, and the generated acoustic spectrum. The paper also describes noise reduction methods

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5

Xiong, Zixiang, Xuxu Zhuang, Zhaoyong Sun, and Liuxian Zhao. "Coupled Helmholtz resonators for broadband Aeroacoustic noise mitigation." Sound & Vibration 59, no. 1 (2024): 1702. https://doi.org/10.59400/sv1702.

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As a structurally simple acoustic element, Helmholtz resonators can exhibit strong resonance when acoustic waves enter the cavity, thus providing excellent sound absorption effects. Consequently, they are widely applied in automotive engine and exhaust systems. This paper systematically investigates the noise reduction performance of multiple coupled Helmholtz resonators under conditions with and without tangential flow. A finite element simulation model with multiple Helmholtz resonators is established by employing COMSOL Multiphysics software to solve the linearized Navier-Stokes equations i

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SOUSA, Laura, Luís GODINHO, and Paulo AMADO MENDES. "Enhancing railway noise reduction through advanced multilayer acoustic absorbent systems with tunable resonators." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 2 (2024): 9027–37. http://dx.doi.org/10.3397/in_2024_4174.

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Railway noise poses a significant environmental challenge, prompting the need for effective mitigation strategies. In response, noise barriers are often employed to reduce noise near railways. This research focuses on the use of porous materials, more specifically porous concrete, for acoustic absorption, particularly in the context of railway noise reduction. A novel approach is proposed, wherein porous multilayer metamaterial systems are developed, with each layer's macroscopic parameters strategically optimized to enhance the overall sound absorption curve. Additionally, to broaden the freq

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Fusaro, Gioia, Xiang Yu, Zhenbo Lu, Fangsen Cui, and Jian Kang. "A Metawindow with Optimised Acoustic and Ventilation Performance." Applied Sciences 11, no. 7 (2021): 3168. http://dx.doi.org/10.3390/app11073168.

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Crucial factors in window performance, such as natural ventilation and noise control, are generally conceived separately, forcing users to choose one over the other. To solve this dualism, this study aimed to develop an acoustic metamaterial (AMM) ergonomic window design to allow noise control without dependence on the natural ventilation duration and vice versa. First, the finite element method (FEM) was used to investigate the noise control performance of the acoustic metawindow (AMW) unit, followed by anechoic chamber testing, which also served as the validation of the FEM models. Furthermo

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Li, Jinyu, Gang Cao, Shujiao Chen, Xiaoyan Lei, and Zhongqiu Zuo. "Study on superposition sound field of filter devices used in power converter stations." Journal of Physics: Conference Series 3031, no. 1 (2025): 012010. https://doi.org/10.1088/1742-6596/3031/1/012010.

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Abstract High-Voltage Direct-Current (HVDC) transmission systems provide a critical means of delivering clean energy to economically developed areas. However, noise pollution from converter stations, particularly from filter devices such as capacitors and reactors, has become a significant concern. This paper investigates the acoustic noise generated by these filter devices, focusing on the superposition of sound fields produced by capacitors and reactors. The theoretical analysis of sound pressure superposition reveals the influence of phase differences between the sound waves emitted by each

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9

Ahmed, Shakeel, Muhammad Tahir Akhtar, and Xi Zhang. "Online acoustic feedback mitigation with improved noise‐reduction performance in active noise control systems." IET Signal Processing 7, no. 6 (2013): 505–14. http://dx.doi.org/10.1049/iet-spr.2012.0204.

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10

Brick, Haike, and Jenny Böhm. "Field-testing of noise abatement measures." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 7 (2023): 830–37. http://dx.doi.org/10.3397/in_2022_0117.

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The strengthening of rail transport must be accompanied by a reduction in emissions. Regarding acoustics, innovative measures to increase noise protection must therefore be developed and investigated. Nevertheless, the determination of the sound reduction effect of mitigation measures on the railway infrastructure or in the propagation path is not yet standardised. There is a need for the development of a measurement and evaluation procedure, which is practice-oriented, reliable and allows the assessment of innovative measures in approval procedures. The German Centre for Rail Traffic Research

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Kaya, Mehmet Numan, Sutharsan Satcunanathan, Matthias Meinke, and Wolfgang Schröder. "Leading-Edge Noise Mitigation on a Rod–Airfoil Configuration Using Regular and Irregular Leading-Edge Serrations." Applied Sciences 15, no. 14 (2025): 7822. https://doi.org/10.3390/app15147822.

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Rod–airfoil configurations are commonly used to study turbulence–structure interaction noise, which is a major contributor to aerodynamic noise in various engineering applications. In this work, noise mitigation by regular and irregular leading-edge serrations is investigated for a rod–NACA0012–airfoil configuration using a direct hybrid CFD/CAA method. Large eddy simulations (LESs) are performed for the turbulent flow, and the acoustic perturbation equations (APEs) are solved to determine the acoustic field. The numerical results are validated by experimental data. The NACA0012 airfoil has di

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Xu, Yiquan, and Yiquan Xu. "FDTD-Based Simulation and Analysis of Noise Reduction Effects in Hospital Wards." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 2 (2023): 5884–92. http://dx.doi.org/10.3397/in_2022_0873.

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The impact of domestic hospital acoustic environment on the health of patients and healthcare workers is attracting more and more attention. This paper investigated and analyzed the noise situation of typical double wards in hospital, and designed noise reduction schemes according to its noise sources; based on finite difference time domain method (FDTD), sound fields in wards were simulated before and after noise reduction treatments, and noise reduction results were compared and analyzed. Results show that FDTD can be used to effectively model sound field of wards with complex boundary condi

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13

Challa, Ganesh, and Dr M. Damodar Reddy. "Acoustic Noise Mitigation in Slip Angle Controlled DTC of Open-End Winding Induction Motor Drive Using Dual Randomized AISPWM for EV Application." International Journal of Electrical and Electronics Research 12, ETEVS (2024): 19–24. http://dx.doi.org/10.37391/ijeer.12et-evs04.

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Low vibration and acoustical noise as well as effective DC link usage are the demands of industries and Electric Vehicles (EV). Direct Torque Control (DTC) of Induction Motors (IMs) meet the EV and other modern industry requirements. Still, flux as well as torque swings lead to higher acoustical noise. Consequently, EVs as well as working place noise have become major concerns, affecting the health of individuals. Efficiency of dc link use is improved by Space Vector Pulse Width Modulation (SVPWM). Yet, SVPWM is not efficient in lowering acoustical noise. Different RPWM techniques can lower ac

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14

Kleizienė, Rita, Ovidijus Šernas, Audrius Vaitkus, and Rūta Simanavičienė. "Asphalt Pavement Acoustic Performance Model." Sustainability 11, no. 10 (2019): 2938. http://dx.doi.org/10.3390/su11102938.

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Low-noise pavements are used as an effective method of traffic noise mitigation. Low-noise pavements reduce the noise that arises due to interactions between tires and road surfaces (tire/road) via the implementation of three main components: low pavement roughness, negative pavement texture, and a high pavement air-void content. The tire/road noise reduction capabilities of the wearing layer vary depending on the aggregate type, gradation, bitumen and air-void content, and density. Consequently, the demand for an accurate tire/road noise prediction model has arisen from the design of asphalt

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15

Cauchy, Pierre, Pierre Mercure-Boissonnault, Cécile Perrier de la Bathie, et al. "Characterization, understanding, and mitigation of underwater noise radiated by ships in the St. Lawrence Estuary." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A347. http://dx.doi.org/10.1121/10.0027781.

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Underwater noise generated by commercial traffic is the main source of anthropogenic noise pollution at low frequencies, increasingly present at a global scale and of critical interest in the St. Lawrence Estuary (eastern Canada), where a rich biodiversity meets the shipping corridor linking the Great Lakes to the Atlantic Ocean. The Marine Acoustic Research Station (MARS, www.projet-mars.ca/en) is an applied research project dedicated to characterizing, understanding, and mitigating underwater traffic noise, contributing to the global effort of improving cohabitation between human activities

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16

Ranpise, Ramesh B., and Bhaven N. Tandel. "Urban road traffic noise monitoring, mapping, modelling, and mitigation: A thematic review." Noise Mapping 9, no. 1 (2022): 48–66. http://dx.doi.org/10.1515/noise-2022-0004.

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Abstract This article analyses the most recent studies on urban traffic noise. About 67 relevant articles on urban road traffic noise and its mitigation strategies were preferred for a critical review. Only 5.97% of items describe how to monitor and record the noise measurement for urban roads, while 7.46% of articles enumerated urban traffic noise pollution exposure. 29.85% of articles proposed a model to evaluate noise reduction effects and predict the noise level. Also, many articles reported noise map generation and its analysis. 56.71% of articles described the noise mitigation strategies

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Lloyd, Joshua, Cole Ludwikowski, Derek Phansalkar, Cyrus Malik, and Chen Shen. "3D printed acoustic metamaterial filters for the mitigation of inaudible ultrasound attacks on smart speakers." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A197. http://dx.doi.org/10.1121/10.0018642.

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Acoustic metamaterials have shown great potential in manipulating acoustic waves with a small footprint and versatile functionality. While their usefulness has been demonstrated in many fields including noise reduction and biomedical ultrasound, not many studies have been done in the field of audible acoustics and speakers. In this work, we show that an acoustic metamaterial-based filter can enhance the security of smart speakers, which are susceptible to inaudible ultrasound attacks due to the shadow effect of the microphones. The filter contains several resonant unit cells which collectively

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18

QIAO, Xiaoru, and Yatsze CHOY. "Environmental noise reduction by sonic crystals barrier." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 9 (2024): 2482–91. http://dx.doi.org/10.3397/in_2024_3189.

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In order to reduce unpleasant effects on human health in environment, recent research has moved towards low-frequency and broadband noise mitigation. However, traditional noise barriers have several common shortcomings: airflow blocking, inefficient noise reduction, visual obstruction. Inspired by the classic design of sonic crystals (SCs), the basic C-shaped unit is improved to replace the conventional vertical outdoor barriers with a compact size. This paper explores the acoustic performance of the shadowed-C-shaped SC both numerically and experimentally. The simulation results show that thi

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19

Kozak, Petr, Ondrej Dasek, Radka Matuszkova, and Michal Radimsky. "Low-Noise Asphalt Pavements in Urban Areas." Applied Mechanics and Materials 858 (November 2016): 282–86. http://dx.doi.org/10.4028/www.scientific.net/amm.858.282.

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Current requirements for the reduction of the noise pollution in inhabited areas are constantly increasing. Acoustic wearing courses represent the real measures how to directly mitigate sources of road traffic noise created by a tire/road contact. Directly reduced noise emissions created by a tire/road contact don't need further mitigation by expensive noise barriers. Noise emissions on two different types of wearing courses of asphalt mixtures (Asphalt concrete for very thin layers and Low-noise stone mastic asphalt) were measured using the specialized device operating on the basis of CPX (Cl

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YUEN, Gary K. C., and David B. K. YEUNG. "Investigation on enhancement of noise reduction of partially open windows and balconies through mock-up test." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 10 (2024): 1977–83. http://dx.doi.org/10.3397/in_2024_3111.

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Application of Acoustic Windows and Acoustic Balconies is a recent trend in Hong Kong to mitigate road traffic noise impact. In severe situations, enhancement is needed for the mitigation measures to provide additional improvement in acoustic performance. The performances of several common enhancements including micro-perforated absorber panels, perforated absorption panels, and balcony sidewalls are investigated through 1:1 mock-up test. The mock-up test aimed to mimic the actual situation, by referencing the spatial relationship between line sources and receivers. International standards are

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21

Bogoi, Alina, Grigore Cican, Laurențiu Cristea, Daniel-Eugeniu Crunțeanu, Constantin Levențiu, and Andrei-George Totu. "Comparing a New Passive Lining Method for Jet Noise Reduction Using 3M™ Nextel™ Ceramic Fabrics Against Ejector Nozzles." Technologies 13, no. 7 (2025): 295. https://doi.org/10.3390/technologies13070295.

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This study investigates the complementary noise control capabilities of two passive jet noise mitigation strategies: a traditional ejector nozzle and a novel application of 3M™ Nextel™ 312 ceramic fabric as a thermal–acoustic liner on the central cone of a micro turbojet nozzle. Three nozzle configurations, baseline, ejector, and Nextel-treated, were evaluated under realistic operating conditions using traditional and advanced acoustic diagnostics applied to data from a five-microphone circular array. The results show that while the ejector provides superior directional suppression and low-fre

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Pingle, Pawan, Gloria Pignatta, and Samuele Schiavoni. "Unifying low and high-frequency noise mitigation: A novel dual noise barrier approach." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A65. http://dx.doi.org/10.1121/10.0022815.

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Road highways and urban areas often employ noise barriers to shield residential areas from excessive traffic noise. Despite continuous efforts, developing materials for noise barriers that can effectively mitigate noise across a wide frequency range is still a challenge. Specifically, creating a single material capable of attenuating both low and high-frequency noise has proven to be a daunting task. Current practices incorporate porous materials for absorbing low-frequency noise at specific locations. To address this limitation and offer a technique for traffic noise reduction, this research

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Zhang, Ziyan, Selin Yaman, Mohamad Salameh, Suryadev Singh, Chengxiu Chen, and Mahesh Krishnamurthy. "Effectiveness of Power Electronic Controllers in Mitigating Acoustic Noise and Vibration in High-Rotor Pole SRMs." Energies 14, no. 3 (2021): 702. http://dx.doi.org/10.3390/en14030702.

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This paper presents a comparative evaluation of power electronic control approaches for vibro-acoustic noise reduction in High Rotor-Pole Switched Reluctance Machines (HR-SRM). It carries out a fundamental analysis of approaches that can be used to target acoustic noise and vibration reduction. Based on the comprehensive study, four candidates for control have been identified and applied to the HR-SRM drive to evaluate their effectiveness and identify challenges. These four methods include phase advancing, current shaping based on field reconstruction, and random hysteresis band with and witho

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KONE, Tenon Charly, Sebastian GHINET, Panneton RAYMOND, and Anant GREWAL. "Structured acoustic materials for mitigating low-frequencybroadband aircraft noise: transfer matrix method." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 10 (2024): 1817–26. http://dx.doi.org/10.3397/in_2024_3084.

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This study investigates, by numerical modeling, the mitigation of low-frequency broadband aircraft noise using a structured assembly of acoustic materials using the Transfer Matrix Method. The prevalence of low-frequency aircraft noise poses challenges to environmental sustainability and passenger comfort. The investigation focuses on an approach that employs strategically arranged structured acoustic materials to attenuate undesirable noise frequencies. The Transfer Matrix Method is used to model the acoustic behavior of the structured assembly, enabling a comprehensive analysis of sound tran

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Syed Sibtain Khali. "Comprehensive Insights into Noise Mitigation for Automatic Speech Recognition Systems." Journal of Information Systems Engineering and Management 10, no. 35s (2025): 357–71. https://doi.org/10.52783/jisem.v10i35s.6012.

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Introduction: It is a comprehensive analysis of the advancements in Automatic Speech Recognition (ASR) systems in the presence of environmental noise, focusing on the challenges posed by various noise types and the evolution of noise mitigation strategies. Environmental noise significantly degrades ASR performance, leading to increased Word Error Rate (WER). The study categorizes background noise available during acoustic production sources for different kinds of surroundings and emphasizes the need for robust noise identification to enhance ASR efficiency. Various mitigation strategies includ

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Stark, Callum, and Weichao Shi. "Hydroacoustic and hydrodynamic investigation of bio-inspired leading-edge tubercles on marine-ducted thrusters." Royal Society Open Science 8, no. 9 (2021): 210402. http://dx.doi.org/10.1098/rsos.210402.

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Underwater radiated noise (URN) has a negative impact on the marine acoustic environment where it can disrupt marine creature's basic living functions such as navigation and communication. To control the ambient ocean noise levels due to human activities, international governing bodies such as the International Maritime Organization (IMO) have issued non-mandatory guidelines to address this issue. Under such framework, the hydroacoustic performance of marine vehicles has become a critical factor to be evaluated and controlled throughout the vehicles' service life in order to mitigate the URN l

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Kone, Tenon Charly, Sebastian Ghinet, Raymond Panneton, and Anant Grewal. "Case study: Sub-metamaterials for Broadband Aircraft Noise Reduction Across Low and High Frequencies." Noise Control Engineering Journal 73, no. 1 (2025): 95–105. https://doi.org/10.3397/1/37737.

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Controlling broadband noise across the entire frequency spectrum, from low to high frequencies, poses a significant challenge for the aerospace, transportation, and construction industries. Recent research has primarily focused on low-frequency noise control solutions using acoustic metamaterials, but these materials are often limited by their narrow-band resonances. This paper addresses this limitation by presenting a novel sub-metamaterial system that broadens the resonance frequency band from low to high frequencies through a parallel assembly of sub-metamaterials. The proposed system compr

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Lu, King Kwong, Maurice Yeung, Kit Wong, and Fanni Lin. "Development on acoustic louvre to enhance the noise reduction performance of acoustic balconies." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A86. http://dx.doi.org/10.1121/10.0022886.

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A balcony in a domestic flat provides residents an outdoor living space as well as better ventilation to improve indoor air quality. However, balcony door when open for natural ventilation will allow outdoor noise transmit into the residential flat. Innovative acoustic balcony design by installation of sound absorptive panels onto the balcony ceiling and side walls of balcony has been implemented in Hong Kong for mitigating road traffic noise. Recently, combined balcony with an extension of utility platform for installation of air-conditioning outdoor unit has become popular. However, the para

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Totu, Andrei-George, Marius Deaconu, Laurențiu Cristea, Alina Bogoi, Daniel-Eugeniu Crunțeanu, and Grigore Cican. "Experimental Analysis of Acoustic Spectra for Leading/Trailing-Edge Serrated Blades in Cascade Configuration." Processes 12, no. 11 (2024): 2613. http://dx.doi.org/10.3390/pr12112613.

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This study aims to highlight the noise reduction achieved through the integration of serrated blades on the leading and trailing edges within a small-scale cascade configuration relevant to turbomachinery contexts. Experiments were conducted using a newly developed 3D-printed test bench, enabling both acoustic and aerodynamic measurements. Turbulence was generated using a rectangular grid positioned at two axial locations. Non-dimensional spectra were computed and compared with experimental data, showing good agreement over a wide frequency range. Significant noise reduction was observed in th

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Wang, Wen-Yu, and Yuh-Ming Ferng. "Numerical model for noise reduction of small vertical-axis wind turbines." Wind Energy Science 9, no. 3 (2024): 651–64. http://dx.doi.org/10.5194/wes-9-651-2024.

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Abstract. Small vertical-axis wind turbines are a promising solution for affordable and clean energy, but their noise emissions present a challenge to public acceptance. Numerous blade designs have been aimed at reducing noise but often come with a decrease in wind turbine aerodynamic efficiency. In this study, the acoustic power and torque of a 5 kW vertical-axis wind turbine (VAWT) were simulated by using different mesh sizes and turbulence models. The simulated torque and noise of the turbine have significant sensitivity to the mesh size, so suitable mesh sizes were determined for the near-

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Chung, Andy W., and Wai Ming To. "Hybrid VR and physical kiosks for soundscape design in urban planning." Journal of the Acoustical Society of America 156, no. 4_Supplement (2024): A94. https://doi.org/10.1121/10.0035221.

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In response to the challenge of urban noise pollution, innovative noise mitigation measures, such as acoustic windows and balconies, have been developed to effectively reduce traffic noise while allowing natural ventilation. To engage stakeholders and demonstrate the effectiveness of these innovations, a physical kiosk equipped with an acoustic window was created, along with a complementary Virtual Reality (VR) experience. This setup aims to create a near-real perception of the sonic environment, allowing users to experience noise reduction capabilities along with other sensory effects. Throug

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Madasamy, P., Rajesh Verma, C. Bharatiraja, et al. "Hybrid Multicarrier Random Space Vector PWM for the Mitigation of Acoustic Noise." Electronics 10, no. 12 (2021): 1483. http://dx.doi.org/10.3390/electronics10121483.

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The pulse width modulation (PWM) inverter is an obvious choice for any industrial and power sector application. Particularly, industrial drives benefit from the higher DC-link utilization, acoustic noise, and vibration industrial standards. Many PWM techniques have been proposed to meet the drives’ demand for higher DC-link utilization and lower harmonics suppression and noise reductions. Still, random PWM (RPWM) is the best candidate for reducing the acoustic noises. Few RPWM (RPWM) methods have been developed and investigated for the AC drive’s PWM inverter. However, due to the lower randomn

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Ho, Wilson, Wylog Wong, and Eric Chu. "Sheet Pile Tuned Mass Damper for Construction Noise Control." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 1 (2023): 6593–600. http://dx.doi.org/10.3397/in_2022_0995.

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Sheet piles are often used for underground retaining structures. For dense geology, vibratory driven method is more cost-effective than press-in driven method, but noisier. Conventional mitigations such as noise barrier or enclosure are not applicable due to the large size of pile wall (generally >12m high and >10m width). Acoustic camera images revealed that noise radiation was dominant at 630Hz to 2000Hz and mainly came from the sheet-pile wall rather than the vibratory exciter. Vibration response measurement showed the sheet piles had two major resonance modes at 1000 and 2000Hz. An i

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Wu, Han, Wangqiao Chen, Peng Zhou, et al. "Assessment and mitigation of the rotor noise for future urban air mobility vehicles." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 4 (2023): 4201–8. http://dx.doi.org/10.3397/in_2023_0595.

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Multi-rotor configurations are often adopted in urban air mobility (UAM) designs. The aerodynamic noise of rotors is a significant source of the UAM vehicles, requiring systematic measurements and mitigation. To this end, a large-scale test rig is designed and built to enable the acoustic measurement of UAM rotor blades. The test rig is placed in an anechoic chamber with the size of 8.1 m (L) × 6 m (W) × 5.1 m (H). The aerodynamic force and noise of a pair of custom-designed blades with a radius of 0.5 m are measured. The rotational speed ranges from 600 to 1800 revolutions per minute. A zig-z

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Barbalho, Bárbara Santos, Matheus Yusef Garavelli, and Armando de Mendonça Maroja. "Acoustic Pollution Assessment Caused by the Federal District Subway (Águas Claras)." Revista de Gestão Social e Ambiental 19, no. 7 (2025): e012749. https://doi.org/10.24857/rgsa.v19n7-004.

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Objective: This research primarily aimed to evaluate the environmental impacts of noise generated by subway operations on the population of Águas Claras, in the Federal District. Theoretical Framework: Transportation noise is recognized as the leading source of global sound pollution. According to the World Health Organization, it's the second-largest environmental problem affecting people, surpassed only by air pollution. In this context, environmental noise measurement and computational simulation, integrated with Geographic Information Systems (GIS), are fundamental tools for mitigating its

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Huisman, Marco, Louis Lederwasch, and René Smidt Lützen. "Bubble curtain modelling: analytical prediction of piling noise mitigation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (2021): 1142–51. http://dx.doi.org/10.3397/in-2021-1763.

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In order to mitigate underwater noise caused by pile driving, bubble curtains are widely used during offshore constructions. These form an impedance barrier to the acoustic pressure wave, and the resulting attenuation on the interface of water to bubbly water is the main driver behind the insertion loss that can be achieved. A secondary effect is energy absorption by bubble resonance; however, normal bubble sizes are such that the resonance frequency is considerably higher than the peak in the piling noise spectrum, rendering the resonance contribution to the overall insertion loss relatively

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Sekunowo, O. I., B. O. Bolasodun, G. T. Oyedepo, and J. Y. Oluwole. "Noise Pollution Mitigation Study of Rice Husk-Ash Nanoparticle Reinforced Epoxy Resin Composites." Journal of Engineering Research 25, no. 1 (2020): 29–38. https://doi.org/10.52968/72018484.

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The menace of noise pollution to human health, knowledge dissemination and tranquil environment continues to increase daily. This is not unconnected with industrialisation and multiplicity of human activities hence the need for the development of eco-friendly materials capable of drastically reducing noise pollution. In this study, epoxy resin composites were synthesised using rice husk ash nanoparticles (RHANP) as reinforcement varied from 5-25 wt. %. The composites were characterised for acoustic capabilities and the results show desirable sound absorption of up to 71.6% sound decibel mitiga

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Tekampe, Sabine, and Markus Oeser. "Assessing the Durability and Acoustic Performance of a Novel Two-Layer Pavement System." Sustainability 15, no. 23 (2023): 16475. http://dx.doi.org/10.3390/su152316475.

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In the quest for more sustainable pavement solutions, this study demonstrates the successful strengthening of a unique noise-reducing two-layer road surface. While existing noise-reducing pavements reveal high acoustic efficiency, they lack mechanical strength, and earlier research efforts addressed the optimization of the individual components of this system, and a comprehensive perspective on its integrated performance remained elusive. Therefore, this research bridges this knowledge gap through an in-depth laboratory evaluation, in which the requirements for the realization of a full-scale

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Lázaro, João, Matheus Pereira, Pedro Alves Costa, and Luís Godinho. "Performance of Low-Height Railway Noise Barriers with Porous Materials." Applied Sciences 12, no. 6 (2022): 2960. http://dx.doi.org/10.3390/app12062960.

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Rail transport is the most sustainable transportation mode, with the lowest energy consumption and carbon footprint. However, the noise induced by railway traffic in urban regions is a significant drawback and several reports point out the risks and the amount of people suffering from direct exposure to railway noise. One of the most used mitigation measures for railway noise is the implementation of noise barriers. Although they offer a significant reduction in noise levels, their height makes people feel enclosed. Therefore, in the case of railway infrastructure, the solution to the problem

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YADAV, Prasad, Harshal BANKAR, and Nagesh WALKE. "LCV Vehicle in-cab noise prediction and reduction using SEA based simulation approach." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 5 (2024): 6545–50. http://dx.doi.org/10.3397/in_2024_3791.

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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

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Yu, Fu-Yang, Zhen-Hua Wan, Ya-Sen Hu, De-Jun Sun, and Xi-Yun Lu. "Effects of leading-edge serration shape on noise reduction in rod-airfoil interactions." Journal of the Acoustical Society of America 157, no. 1 (2025): 215–33. https://doi.org/10.1121/10.0034845.

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Leading-edge serrations inspired by owls exhibit the capability to control airfoil-turbulence interaction noise, but the design principle of the serration shape is still an open issue. To this end, we designed five types of serration shapes with different combinations of curvature, namely, triangular, ogee, anti-ogee, feather-like, and anti-feather-like. These curves are applied to serrated modifications with different bluntness levels (sharp or blunt) and amplitudes (0.05, 0.075, and 0.1 chord length). Considering these serration shapes, 30 cases with various curved types, bluntness levels, a

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Shen, Yingyin, Yuanqing Bai, Xiao Liu, and Bin Zang. "Drone Noise Reduction Using Serration–Finlet Blade Design and Its Psychoacoustic and Social Impacts." Sustainability 17, no. 8 (2025): 3451. https://doi.org/10.3390/su17083451.

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Unmanned aerial vehicles, particularly drones, have been increasingly deployed for different tasks in the community. They have become an important part of the economic and social benefits that society is exploiting from modern technology development. However, efforts are still required to further develop technologies which can mitigate the negative impacts. Among them, drone noise is considered a major health concern for the community. The present study undertakes an experimental investigation of the effectiveness of blade modifications on drone noise in an aeroacoustic wind tunnel facility. A

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Gramowski, Christoph, and Roxana Donner. "Assessment of the Noise Reduction Impact from Application Restrictions on Rail Dampers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 3 (2023): 4764–72. http://dx.doi.org/10.3397/in_2022_0689.

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In the last decades, rail dampers had become a commonly used rolling noise abatement measure at several mainline and metro networks. Rolling noise reductions outdoor/indoor up to 4/8 dB had been found. While the beginning of damper application was started with multiple test sections, infrastructure managers had raised installation restrictions from other related technology departments like signaling and communication. This is leading to defined sections where one rail has to remain partially free from dampers or the track has to remain completely free from dampers. These sections become releva

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SCHINDLER, Johannes, Arthur BRAUNSCHWEIG, Rolf HUWYLER, and Erik BüHLMANN. "How sustainable are low-noise pavements? Answers from a life-cycle-assessment including the use-phase and noise mitigation of typical Swiss pavements." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 8 (2024): 3732–43. http://dx.doi.org/10.3397/in_2024_3363.

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Despite continuous efforts to reduce road noise emissions, road noise is still the dominant source of noise in Switzerland. Low-noise pavements are an effective measure for road noise mitigation, but besides their higher cost, their major drawback is a reduced service lifetime as compared to conventional pavements. How do these arguments compare in a comprehensive view? To address this question, we performed a cradle-to-grave life-cycle-analysis of four different pavement types: a conventional pavement as reference, two types of semi-dense low-noise pavements and an acoustically optimized type

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Juan, Shiang-I., and Lucky S. Tsaih. "An overview of green roof acoustic performance." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A283. http://dx.doi.org/10.1121/10.0027517.

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This comprehensive review provides an in-depth examination of the acoustic performance of green roofs within urban and built environments over the past 15 years. Green roofs, characterized by their vegetative cover and substrate layers, offer a multifaceted solution to address challenges associated with urban noise pollution. The objective of this review is to synthesize existing literature, emphasizing key studies and methodologies employed to assess the noise reduction and sound isolation capabilities of green roofs. Factors influencing green roof acoustic performance, such as plant species

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SHARMA, Ashutosh, Corinna KRAASCH, and Anna WEGNER. "Acoustic evaluation: microphone array measurements on a multi-megawatt individual pitch control wind turbine." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 8 (2024): 3376–87. http://dx.doi.org/10.3397/in_2024_3318.

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As rotor diameters of wind turbines approach 200 m, aerodynamic noise becomes a significant issue, especially for onshore turbines. The rapid expansion of wind energy has led to increased concerns regarding the noise generated by wind turbines particularly in proximity to residential areas. This study investigates the noise emissions from a full-scale multi-megawatt individual pitch control (IPC) onshore wind turbine, with rotor diameter of 158 m and a hub height of 120 m, across 12 scenarios-six upstream and six downstream. The wind turbine under investigation operates under both IPC and non-

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Redonnet, Stephane. "Further assessment of a time domain impedance boundary condition for the numerical simulation of noise-absorbing materials." International Journal of Aeroacoustics 20, no. 8 (2021): 927–58. http://dx.doi.org/10.1177/1475472x211052701.

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In regard to the mitigation of environmental noise across major industry sectors, the present study focuses on the numerical prediction of passive noise reduction devices. Here, it is further explored how the noise attenuation induced by locally reacting noise absorbing materials (also called acoustic liners) can be simulated using a time domain highly accurate Computational AeroAcoustics (CAA) method. To this end, it is assessed how a classical Time Domain Impedance Boundary Condition (TDIBC) can effectively model acoustic liners of practical interest, including when the latter are exposed to

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Guy, Marc-André, Kamal Kesour, Olivier Robin, Julien St-Jacques, and Mathis Vulliez. "Evaluation of the performance of technologies for reducing ships' machinery noise using a small-scale ship-like structure in a Water Basin." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A348—A349. http://dx.doi.org/10.1121/10.0027786.

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Ocean ambient levels have increased in the last decades, especially in the low-frequency domain (under 500 Hz). This increase is partly due to underwater radiated noise (URN) from commercial ships. Excessive URN harms marine life and is, therefore, considered a pollution that needs to be reduced. At low speeds, machinery is the primary noise source on ships. Mitigation technologies exist to limit machinery’s contribution to URN. While implementing these technologies is costly, a lack of quantitative data regarding their exact performances usually results in limited concrete ship applications s

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Sharma, Gyani Shankar, and Abhijit Sarkar. "Directivity-Based Passive Barrier for Local Control of Low-Frequency Noise." Journal of Theoretical and Computational Acoustics 26, no. 04 (2018): 1850012. http://dx.doi.org/10.1142/s2591728518500123.

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This work concerns with improving the transmission loss offered by a noise barrier separating two acoustic spaces in the low-frequency range. A novel concept of local mitigation of the transmitted noise at a target receiver location is presented by controlling the directivity of the transmitted noise through a point mass attachment on the barrier surface. Mass attachment at an arbitrary location is shown to increase the noise transmission. Optimal locations of the mass to minimize the sound transmission in the normal, oblique and tangential directions to the barrier are obtained. Optimal place

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Havran, Volodymyr, and Mariia Orynchak. "SMART NOISE POLLUTION MANAGEMENT USING AWS IOT CORE AND CLOUD INTEGRATION." Computer Design Systems. Theory and Practice 7, no. 1 (2025): 73–80. https://doi.org/10.23939/cds2025.01.073.

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Urban and rail transport noise pollution is an increasing concern due to its negative impact on public health, including cardiovascular diseases, sleep disturbances, and cognitive impairments (WHO, 2018). Traditional noise monitoring systems, which rely on static measurements, lack real-time adaptability and struggle to accurately classify noise sources in dynamic environments. This study explores the application of AWS IoT Core in smart acoustic monitoring systems to enhance noise detection, classification, and mitigation. By integrating AWS IoT Core with advanced noise sensors and spectrum a

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