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Francisco Fernández-Zacarías, Juan Luis Beira-Jiménez, Virginia Puyana-Romero and Ricardo Hernández-Molina
The study aims to diagnose the sound pressure levels inside incubators in a controlled environment under free-field conditions. The tests were carried out in a semi-anechoic room under the standard UNE-EN ISO 3745:2012/A1:2018 in three different operatin...
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Francisco Fernández-Zacarías, Virginia Puyana-Romero and Ricardo Hernández-Molina
Background: It is known that high noise levels can be harmful to preterm infants, causing physiological and psychological disorders. It is also known that premature babies spend a lot of time in an incubator. In this sense, many studies show that incubat...
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Jukka Tanttari and Antti Hynninen
Marine propulsors represent one of the most important contributors among anthropogenic sounds radiated into water. Blade based propulsors, e.g., propellers, generate tones at the blade passing frequency and its harmonics, especially in cavitating conditi...
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Mengge Yu, Jiali Liu, Wei Huo and Jiye Zhang
Aiming to improve the comprehensive aerodynamic performance of a high-speed train, a multi-objective shape optimization method for a streamlined train head is proposed in this work. The shape of the streamlined train head is parameterized with some splin...
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Alexander MacGillivray and Christ de Jong
Underwater sound mapping is increasingly being used as a tool for monitoring and managing noise pollution from shipping in the marine environment. Sound maps typically rely on tracking data from the Automated Information System (AIS), but information ava...
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Svein Vagle, Rianna E. Burnham, Caitlin O?Neill and Harald Yurk
Oceanic acoustic environments are dynamic, shaped by the spatiotemporal variability in transmission losses and sound propagation pathways of natural and human-derived noise sources. Here we used recordings of an experimental noise source combined with tr...
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Miles Parsons and Mark Meekan
Vessel noise is an acute and chronic stressor of a wide variety of marine fauna. Understanding, modelling and mitigating the impacts of this pollutant requires quantification of acoustic signatures for various vessel classes for input into propagation mo...
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Erwan Bocher, Gwenaël Guillaume, Judicaël Picaut, Gwendall Petit and Nicolas Fortin
The urbanisation phenomenon and related cities expansion and transport networks entail preventing the increase of population exposed to environmental pollution. Regarding noise exposure, the Environmental Noise Directive demands on main metropolis to pro...
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Bellamkonda Saidulu, Arun Manoharan and Kumaravel Sundaram
The preamplifier block is crucial in bio-medical signal processing. The power intensive Operational Transconductance Amplifier (OTA) is considered, and the performance of preamplifier is studied. A low noise and low power telescopic OTA is proposed in th...
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Michel Roger and Stéphane Moreau
The present work deals with the modeling of the aerodynamic sound generated by the propellers of small-size drones, taking into account the effects of horizontal forward flight with negative pitch and of installation on supporting struts. Analytical aero...
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Tianyun Qin, Rangding Wang, Diqun Yan and Lang Lin
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Nikolaos M. Papadakis and Georgios E. Stavroulakis
Noise barriers are a critical part of noise mitigation in urban and rural areas. In this study, a comparison of the insertion loss calculations of noise barriers via the Finite Element Method (FEM) and various formulae (Kurze?Anderson, ISO 9613-2/Tatge, ...
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O. V. Kravchenko, O. A. Azarova and D. D. Knight
The problem of noise reduction in supersonic aircraft design is one of the key problems, the solution of which largely determines the speed of development of supersonic aviation as a whole. The present study examines the noise generation during flights o...
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Choon-Su Park, Sun-Ho Lee and Dong-Jin Yoon
Underground pipeline monitoring.
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Nikolaos M. Papadakis and Georgios E. Stavroulakis
Handclap is a convenient and useful acoustic source. This study aimed to explore its optimal application and limitations for acoustic measurements as well for other possible utilizations. For this purpose, the following steps were performed: investigatio...
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Bence Tóth, János Vad
Pág. 152 - 158
Axial fans operate in large numbers, often in the close vicinity of humans, therefore reducing their noise is a primary concern. In this paper, beamforming is applied to get information about the location and strength of noise sources on the rotor. This ...
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Kanghyu Lee, Junmuk Lee, Changwoo Ha, Minseok Han and Hanseok Ko
Driver assistance systems are a major focus of the automotive industry. Although technological functions that help drivers are improving, the monitoring of driver state functions receives less attention. In this respect, the human heart rate (HR) is one ...
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Esztella Balla, János Vad
Pág. 122 - 129
The paper presents wind tunnel experiments, supplemented with phased array microphone measurements, on 2D basic models of low-speed axial fan blade sections: a flat plate, a cambered plate, and a RAF6-E airfoil. It aims at documenting the establishment o...
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Stephen Schade, Robert Jaron, Lukas Klähn and Antoine Moreau
The rotor?stator interaction noise is a major source of fan noise. Especially for low-speed fan stages, the tonal component is typically a dominant noise source. A challenge is to reduce this tonal noise, as it is typically perceived as unpleasant. There...
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Xing Zhao, Xiaoyang Jia, Lin Li and Hanyu Wang
In this paper, we aim to address the challenge of airflow interference during fault detection in high-speed train bogies by introducing a flow field and investigating the characteristics of the sound field distribution of critical components under its in...
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