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Academic literature on the topic 'Ventilation – Noise'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Ventilation – Noise"

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Ávila Ferreira, Vinícius. "Soundproof Window - Natural Ventilation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 3294–304. http://dx.doi.org/10.3397/in-2021-2361.

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Expansion of brasilians cities worsen noise pollution in these places, forcing people to maintain their doors and windows closed. Domestic environment enclosing lead to necessity of air conditioning system, however the frequent use of the equipment may cause many health problems, such as respiratory difficulties and spread of diseases , not to mention high costs with energy. Considering these facts, there is the need of soundproofing windows with air supply , that allows passage of air without noise passage, guarantee a well-ventilated environment, with thermic and acoustic comfort without the use of acclimatisation systems . we have developed two prototypes with significant opening that allows air supply (passage) (0,35m2) and noise reduction (Rw+Ctr) reaching 8 to 10 dB. In the first study, we considered people inhabiting really noisy surrounding areas, who has already installed a regular window. In this particular case, we developed a soundproofing window air supply that can be installed over the existing one. A second study considered new constructions to focus the environment where the person sleeps and then elaborate a soundproofing window air supply for bedrooms.
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Allardet-Servent, Jérôme. "Adding noise to mechanical ventilation." Critical Care Medicine 40, no. 9 (September 2012): 2725–26. http://dx.doi.org/10.1097/ccm.0b013e31825bc827.

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Harvie-Clark, Jack, Anthony Chilton, Nick Conlan, and David Trew. "Assessing noise with provisions for ventilation and overheating in dwellings." Building Services Engineering Research and Technology 40, no. 3 (January 29, 2019): 263–73. http://dx.doi.org/10.1177/0143624418824232.

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In the design of residential developments, it has been common practice for façade sound insulation (to protect against outdoor noise) to be considered separately from the provisions for ventilation and for mitigating overheating. This fragmented approach has led to different designers making different, incompatible assumptions about the internal environmental quality conditions: the acoustic designer assumes that windows are closed to control external noise ingress, while the mechanical designer assumes that windows are open for ventilation or mitigating overheating. This leaves occupants with a choice between reasonable noise levels or thermal comfort, but not both. This problem is exacerbated by increased overheating risk in modern buildings and future climate scenarios. In response to this issue, the Association of Noise Consultants has produced the draft Acoustics Ventilation and Overheating Residential Design Guide – the ‘AVO Guide’. The AVO guide recommends an approach to acoustic assessment that takes regard of the interdependence of provisions for external noise ingress, ventilation and overheating. This paper describes the context, background and content of the AVO Guide. There are references to passive attenuated options for ventilative cooling to help designers avoid simply specifying mechanical cooling. Practical application: This paper is entirely focused on the practical application of the guidance in the Association of Noise Consultants’ Acoustics, Ventilation and Overheating Residential Design Guide. It describes the current practical problem that designers face, and the mistakes that are the common practice across the industry, of failing to integrate the design for noise with the ventilation strategy and provisions for overheating. It outlines how this can be achieved to enable better internal environmental quality conditions for occupants, supported by the current English Planning regime and professional good practice guidance available.
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Landström, Ulf, Anders Kjellberg, Lena Söderberg, and Bertil Nordström. "The Effects of Broadband, Tonal and Masked Ventilation Noise on Performance, Wakefulness and Annoyance." Journal of Low Frequency Noise, Vibration and Active Control 10, no. 4 (December 1991): 112–22. http://dx.doi.org/10.1177/026309239101000402.

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A laboratory study was designed in order to investigate the effects of ventilation noise on performance, fatigue and annoyance. The study was also designed in order to compare the effects of broadband noise 40 dB(A), tonal noise, 40 dB(A), and tonal noise masked by means of low frequency pink noise, 41 dB(A). The study of performance was based on a figure identification test. The annoyance and fatigue were tested by means of rating scales. The analyses of fatigue also included EEG-recordings. The acceptability of the different types of ventilation noise was also analysed through matching tests. The differences in performance between broadband and tonal ventilation noise were significant and did not show any unambiguous tendency. An insignificant tendency of worse performance during broadband exposure and that the tonal ventilation noise should be more tiring could be observed. The tonal exposure was described as less annoying during work. On the other hand, in the matching tests, the subjects tolerated an insignificantly lower level of the tonal ventilation noise compared to the broadband noise. Comparisons between the tonal ventilation noise and the tonal ventilation noise masked by means of a pink noise, showed that the masked ventilation noise was correlated to ambiguous tendencies towards higher performance, lower fatigue but higher annoyance. In the matching tests, the subjects tolerated a lower level of masked ventilation noise compared to the unmasked ventilation noise. Except for the ratings of fatigue, all differences were below the level of significance p 0.05.
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Zaman, Taylan, Abdusselam Celebi, Bengusu Mirasoglu, and Akin Savas Toklu. "The evaluation of in-chamber sound levels during hyperbaric oxygen applications: Results of 41 centres." Diving and Hyperbaric Medicine Journal 50, no. 3 (September 30, 2020): 244–49. http://dx.doi.org/10.28920/dhm50.3.244-249.

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Introduction: Noise has physical and psychological effects on humans. Recommended exposure limits are exceeded in many hospital settings; however, information about sound levels in hyperbaric oxygen treatment chambers is lacking. This study measured in-chamber sound levels during treatments in Turkish hyperbaric centres. Methods: Sound levels were measured using a sound level meter (decibel meter). All chambers were multiplace with similar dimensions and shapes. Eight measurements were performed in each of 41 chambers; three during compression, three during decompression, and two at treatment pressure, one during chamber ventilation (flushing) and one without ventilation. At each measurement a sound sample was collected for 25 seconds and A-weighted equivalent (LAeq) and C-weighted peak (LCpeak) levels were obtained. Recorded values were evaluated in relation to sound level limits in regulations. Results: The highest sound level measured in the study was 100.4 dB(A) at treatment pressure while ventilation was underway and the lowest was 40.5 dB(A) at treatment pressure without ventilation. Most centres had sound levels between 70 dB and 85 dB throughout the treatment. Ventilation caused significant augmentation of noise. Conclusions: The chambers were generally safe in terms of noise exposure. Nevertheless, hyperbaric chambers can be very noisy environments so could pose a risk for noise-related health problems. Therefore, they should be equipped with appropriate noise control systems. Silencers are effective in reducing noise in chambers. Thus far, hyperbaric noise research has focused on chambers used for commercial diving. To our knowledge, this is the first study to investigate noise in hospital-based chambers during medical treatments.
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Hodgson, Murray. "Acoustical Evaluation of Six ‘Green’ Office Buildings." Journal of Green Building 3, no. 4 (November 1, 2008): 108–18. http://dx.doi.org/10.3992/jgb.3.4.108.

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To explain the reactions of the building occupants to their acoustical environments, meetings with the designers, walk-through surveys, and detailed acoustical measurements were done. The objective was to determine how design decisions affect office acoustical environments, and how to improve the acoustical design of ‘green’ office buildings. Design-performance criteria were established. Measurements were made of noise level, reverberation time, speech-intelligibility index (SII), and noise isolation. Noise levels were atypically low in unoccupied buildings with no mechanical ventilation, but excessive in areas near external walls next to noisy external noise sources—especially with windows open for ventilation—and in occupied buildings. Reverberation times were excessive in areas with large volumes and insufficient sound absorption. Speech intelligibility was generally adequate, but speech privacy was inadequate in shared and open-office areas, and into private offices with the doors open for ventilation. Improvement of the acoustical design of ‘green’ buildings must include increasing the external-internal noise isolation and that between workplaces, and the use of adequate sound absorption to control reverberation and noise.
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Xu, Rui, and Ting Fang Yu. "The Renovation of Noise Reduction and Ventilation for Indoor Substations." Advanced Materials Research 732-733 (August 2013): 738–44. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.738.

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The noise reduction and ventilation cooling is contradictory each other for urban indoor substation. Our efforts were focused on the problems of the excessive noise and poor ventilation of indoor substation in this paper, the existing shortages of the primary ventilation cooling program and the noise source characteristics of the indoor substation were analyzed, and the renovation of noise reduction and ventilation cooling was proposed. The measurement data of before and after renovation demonstrated that this renovation on noise reduction and ventilation cooling has a visible effect in meeting the national standard for noise level of the substation surrounding as well as in improving the cooling effect significantly.
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Holmberg, Kjell, Ulf Landstrom, and Anders Kjellberg. "Effects of Ventilation Noise Due to Frequency Characteristic and Sound Level." Journal of Low Frequency Noise, Vibration and Active Control 12, no. 4 (December 1993): 115–22. http://dx.doi.org/10.1177/026309239301200401.

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In two studies twelve subjects were exposed to different types of ventilation noise in a simulated office. In Study 1, a ventilation noise with a gradually falling frequency/level spectral character, was considered as more annoying than a ventilation noise with a band of raised levels around 43 Hz and in particular a tone at 43 Hz. The differences in acceptable comfort levels were aproximately 7 dB when comparing the tonal and gradually falling frequency/level ventilation noise. The frequency character thus has to be considered when evaluating the annoyance due to ventilation noise. The result from Study 2 gives support to the suggested lowering of the highest acceptable level of ventilation noise from 40 to 35 dB(A) and that the level should be reduced even more in environments designed for intellectual work.
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Xu, Nan, and Chi Zhang. "The Theoretical Study of Noise Control Engineering Design." Applied Mechanics and Materials 295-298 (February 2013): 2034–40. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.2034.

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Mine ventilation system is serious pollution to the surrounding environment. Due to the air flow rate, high speed, strong noise radiation. In addition to the scientific and reasonable design for muffler, ventilation resistance loss calculation is one of the key successful factors of project design, in order to eliminate the noise pollution of mine ventilation system.In recent years,people's awareness level of the harm of noise rises ceaselessly, the environmental protection departments also gradually enlarges the management and punishment to noise pollution.The noise control of coal mine ventilation system with strong radiation and harm has become a pressing matter of the moment. Because the theory calculation of noise control design is fuzzy, Some environmental protection company implement noise control by virtue of experience or imitation of other engineering, leading to a series of problems, such as noise control can not reach the design standard, large ventilation resistance, energy consumption increased, regeneration noise exceed the standard, system vibration. Based on the systematic study for engineering design, i summed up the theory calculation rule for the coal mine ventilation system noise control, as reference to technical personnel.
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Gaab, Oliver, and Delf Sachau. "Active noise reduction in ventilation ducts." Journal of the Acoustical Society of America 128, no. 4 (October 2010): 2380. http://dx.doi.org/10.1121/1.3508464.

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Dissertations / Theses on the topic "Ventilation – Noise"

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Brandstaett, Peter. "Low frequency noise in ventilation systems." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396112.

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Larsson, Martin. "Active Noise Control in Ventilation Systems : Practical Implementation Aspects." Licentiate thesis, Karlskrona : Department of Signal Processing, School of Engineering, Blekinge Institute of Technology, 2008. http://www.bth.se/fou/Forskinfo.nsf/Sok/a4d08437e2b436f5c12575120052135d/$file/LarssonM_lic.pdf.

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Tao, Fuyang. "Experimental study of restrictor noise in ventilation duct systems." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/398630/.

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Single-hole restrictors are widely used in the aircraft air distribution system (ADS). The noise generated due to the flow passing over the restrictor is a main interior noise source of the cabin. Prediction of the restrictor noise generation is important for a quite ADS design. This work experimentally and analytically studies the noise generation mechanisms of the single-hole restrictor. An experimental rig to investigate the restrictor self-noise and interaction noise generated by the turbulent wake produced by in-duct elements installed in the duct and impinging on the restrictor has been developed and constructed. Aeroacoustic measurements of the restrictor self-noise have been made both inside and in the far field of the duct. Two models have been developed to understand the restrictor noise generation mechanisms and predict the sound power level (PWL). One model is based on the surface pressure cross spectrum to compute the effective axial dipole distribution. The other is an extension of previous work and based on the static pressure drop across the restrictor. The restrictor dimension is shown to have a large effects on the restrictor noise generation. For the interaction noise generation, the important parameters including mean flow speed, restrictor dimension, turbulence level and characteristic length, that determine the sound power radiation spectrum are studied. A semi-empirical model has been developed to predict the sound power spectrum due to interaction noise. The link between the interaction noise generation and the restrictor surface pressure has been investigated. In addition to the investigation of the restrictor noise generation, this work conducted a short study into the use of surface roughness on the upstream side of the restrictor to reduce the noise generation whilst maintaining the pressure drop across it. It is shown that the noise generation can be reduced above the first cut-on frequency of the duct by increasing the upstream surface roughness.
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Larsson, Martin. "Active Control of Noise in Ventilation Systems : Analysis and Experiments." Doctoral thesis, Karlskrona : Blekinge Institute of Technology, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00510.

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In many kinds of buildings, the ventilation system constitute a well known source of broadband noise. Traditionally, duct born noise is attenuated using passive resistive silencers which produce a high level of attenuation over a broad frequency range. However, they tend to become large and bulky if designed for low frequency attenuation. The active noise control (ANC) technique is known for its ability to produce high levels of attenuation in the low frequency range even with a relatively moderate sized ANC system. Accordingly, a combination of active- and passive techniques, i.e. the construction of a hybrid active/passive silencer, provides a duct silencer solution of manageable size which also covers the low frequency range. However, adequate levels of attenuation are not likely to be obtained if the installation of the ANC system is not designed to account for the physical factors that may degrade its performance. This thesis focuses on applying ANC in ventilation systems, with particular emphasis on analyzing the limiting effect of some of these physical factors on the controller, and installation design for the purpose of reducing the influence of them. The degrading factors of particular interest include: flow induced noise in the microphone signals, acoustic feedback between the control loudspeaker and reference microphone, and standing waves and higher order acoustic modes inside the ducts. With respect to installation design, focus is also placed upon industry requirements for the ANC system. This has led to a module based approach, in which the microphones and the loudspeaker are installed in separate modules based on standard duct parts. This thesis is comprised of six parts. The first and third parts analyze the influence of flow-induced noise on the adaptive digital controller theoretically, through simulations and experiments. The second part describes investigations of several microphone installations intended to reduce flow induced noise. Further, results of measurements conducted in an acoustic laboratory according to an ISO-standard are presented. The attenuation produced by the ANC system was approximately 15-25 dB between 50-315 Hz, even for airflow speeds up to 20 m/s. The fourth part focuses on the possibility of using a passive silencer in combination with ANC, to reduce acoustic feedback and standing waves, while the fifth part investigates the possibility of using a passive silencer to reduce standing waves in the duct when the ANC system is not installed near the duct outlet. In ducts of larger dimensions, higher order acoustic modes may be in the frequency range adequate for ANC. The final part presents initial investigations concerning the feasibility of dividing a duct of large dimension into two more narrow ducts to remove higher order acoustic modes in the ANC frequency range, and the feasibility of applying single-channel ANC in each duct.
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Michael, Michalakis Christaki. "Noise generation by duct terminations." Thesis, London South Bank University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240206.

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Trinder, M. C. J. "Active noise control in finite length ducts." Thesis, University of Essex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371924.

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Neale, James Richard Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Experimental and numerical investigation of noise generation from the expansion of high velocity HVAC flows on board ocean going fast ferries." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2006. http://handle.unsw.edu.au/1959.4/28371.

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This thesis details a study of strategies used to limit the flow generated noise encountered in the outlet diffusers of high velocity heating, ventilation and air conditioning (HVAC) duct systems. The underlying noise rating criterion is drawn from the specifications covering ocean going aluminium fast ferries. Although directed primarily towards the fast ferry industry the results presented herein are applicable to other niche high velocity HVAC applications. Experimental tests have been conducted to prove the viability of a high velocity HVAC duct system in meeting airflow requirements whilst maintaining acceptable passenger cabin noise levels. A 50 mm diameter circular jet of air was expanded using a primary conical diffuser with a variety of secondary outlet configurations. Noise measurements were taken across a velocity range of 15 to 60 m/s. An optimum outlet design has been experimentally identified by varying the diffuser angle, outlet duct length and the termination grill. A 4 to 5 fold reduction in required duct area was achieved with the use of a distribution velocity of 20 to 30 ms-1, without exceeding the prescribed passenger cabin noise criteria. The geometric configuration of the diffuser outlet assembly was found to have a pronounced effect on the noise spectrum radiating from the duct outlet. The development of a numerical model capable of predicting the flow induced noise generated by airflow exiting a ventilation duct is also documented. The model employs a Large Eddy Simulation (LES) CFD model to calculate the turbulent flow field through the duct diffuser section and outlet. The flow-generated noise is then calculated using a far field acoustic postprocessor based on the Ffowcs-Williams and Hawkings integral based formulation of Lighthill???s acoustic analogy. Time varying flow field variables are used to calculate the fluctuating noise sources located at the duct outlet and the resulting far field sound pressure levels. This result is then used to calculate the corresponding far field sound intensity and sound power levels. The numerical acoustic model has been verified and validated against the measured experimental results for multiple outlet diffuser configurations.
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Mak, Cheuk-Ming. "The application of computational fluid dynamics to the prediction of regenerated noise in ventilation systems." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321131.

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Barclay, Michael. "The interaction of building energy use, ventilation performance and urban noise under future climate scenarios." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/4124/.

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This thesis studies the interaction of building energy use, ventilation performance and urban noise under future climate scenarios, comparing in particular the noise and climatic influences on non-domestic natural ventilation cooling. The main objective is to determine the level of climate change temperature increase that a noise reduction measure would mitigate. This involves quantifying the tension between maximising natural ventilation and maintaining good acoustic conditions. Methods are linked that are appropriate to a number of scales: ventilation aperture, whole-building, urban area, and the climate scale. Using the Finite Element Method (FEM), it was found that the sound transmission of ventilation apertures varied by up to 8dB across the frequencies considered. Noise mapping and whole building thermal performance were used to quantify natural ventilation potential and the impact of noise reduction measures. Three future climate data sets were compared and it was found that all sets provided acceptable information about future natural ventilation performance. The difficulty of adopting natural ventilation with the warming present in all the data sets was clear from the high levels of future overheating. Using these methods and a representative future weather data set, a number of design implications were illustrated, such as the reduction in sensible cooling per unit of ventilation airflow with higher summer temperatures. The main comparison of acoustic and climatic environmental influences showed that a 10dB noise reduction measure affecting natural ventilation could mitigate a summer temperature increase due to climate change of between 2.0°C and 3.4°C.
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Grasso, Gabriele. "Development of hybrid methods for the computation of tonal and broadband fan noise source and propagation." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11790.

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Ces travaux de doctorat portent sur la réduction du bruit d'origine aérodynamique émis par les ventilateurs et les doublets d'hélices contra-rotatifs. La méthodologie proposée consiste à intégrer des méthodes rapides et précises de prédiction des niveaux sonores dans le processus de conception. Cette thématique a vu son intérêt augmenter depuis que l'Union Européenne a restreint les limites d'exposition au bruit en milieu de travail et dans les zones habitées à proximité des aéroports. Parmi les méthodes numériques employées en aéroacoustique, les méthodes hybrides de prédiction du bruit sont considérées comme particulièrement appropriées pour la conception automatisée du fait de leur coût modéré en temps de calcul. Ces méthodes séparent la résolution de l'écoulement aérodynamique de celle de la génération du bruit et de sa propagation en champ lointain. L'écoulement aérodynamique est obtenu par simulation numérique, tandis que l'acoustique est traitée par méthodes analytiques. Ces méthodes analytiques développées et validées pour déterminer le bruit d'un profil aérodynamique placé dans un écoulement turbulent seront étendues pour traiter le réponse acoustique de pales en rotation. Ces travaux se concentrent sur deux configurations de ventilateurs basses vitesses. La première configuration traitée est le doublet d'hélices contra-rotatif de 4.2m de diamètre de la soufflerie L-1 de l'Institut von Karman (VKI). Ce système permet d'étudier le phénomène de bruit tonal et à large bande dû à l'impact des sillages turbulents, générés par l'hélice amont, sur l'hélice aval. La deuxième configuration traitée est un ventilateur à quatre pales du CETIAT (France) installé seul dans un large plenum. Ce système permet d'étudier le bruit propre ou bruit de bord de fuite causé par l'interaction des tourbillons générés par l'écoulement autour de la pale avec le bord de fuite de la pale. Pour cette configuration, des données expérimentales sont rendues disponibles dans le cadre d'un projet commun entre le VKI et le CETIAT. Les méthodes hybrides sont développées et mises en oeuvre pour ces deux mécanismes de bruit présents dans les deux configurations de ventilateur. L'objectif de ces travaux de thèse est d'employer les méthodes hybrides ainsi calibrées et validées pour réaliser l'optimisation du doublet d'hélices contra-rotatif de la soufflerie L-1. Le coeur de ces travaux portera sur l'extension des méthodes hybrides pour la prédiction du bruit d'un profil dans un écoulement turbulent uniforme au cas du bruit tonal et à large bande d'interaction de sillages et du bruit à large bande de bord de fuite dans des ventilateurs basses vitesses. Il sera montré qu'il est possible de déterminer le spectre de bruit de manière rapide et précise en s'appuyant sur la connaissance du champ aérodynamique dont les quantités seront extraites de simulations numériques stationnaires (RANS) pour alimenter la formulation analytique retenue. Cette dernière doit être adaptée au mécanisme de bruit étudié, à savoir l'interaction d'une pale de ventilateur avec un sillage ou celle du bord de fuite avec la turbulence qui s'est développé le long de la pale. Les deux mécanismes de bruit sont d'abord modélisés avec des fonctions analytiques qui sont calibrés avec les données des simulations numériques. Les modèles de sources de bruit ainsi que les estimations finales de spectre de bruit sont comparées aux données expérimentales disponibles et à des simulations directes. Enfin la méthodologie retenue est mise en oeuvre dans le cadre de l'optimisation du doublet d'hélices L-1 au moyen d'un algorithme génétique. L'étude détaillée de la sensibilité des paramètres et des contraintes de l'optimisation apporte un nouveau regard sur l'optimisation multi-objectif efficacité-bruit qui sera de plus en plus utilisée pour la conception de turbomachine dans le futur.
Abstract : The context of this thesis is the reduction of noise emitted by ventilation fans and aeronautical counter-rotating open rotors, which will be achieved by implementing fast and accurate noise prediction methods in the design process. The interest towards this subject has increased since the European Union enforced lower limits of exposure to noise in work environments and also to environmental noise in the proximity of airports. In the field of computational aeroacoustics, hybrid methods for noise prediction are considered particularly suitable for use in an automated design procedure due to their low computational cost. In fact they split the description of the flow field, which is made by computational fluid dynamics, from the quantification of the source of noise and of its propagation, obtained by using analytic formulations. Such analytic methods have already been used successfully for the prediction of the noise emitted by an airfoil placed in a turbulent flow; it is therefore natural to try to extend their applicability to the case of rotating blades. Two application cases have been chosen for this thesis. The first one is the 4.2 m diameter counter-rotating fan of the von Karman Institute (VKI) L1 low-speed wind tunnel, which is used to study the phenomenon of wake-interaction tonal and broadband noise. The second application case is a four-bladed low-speed ventilation fan in which the dominant source of noise is the trailing-edge or self-noise caused by the turbulent eddies passing over the trailing-edge of the blade. In this case, an experimental database has been made available by CETIAT, France, in the framework of a collaborative project with VKI. The final step of the project will be to use the prediction codes developed for both the noise phenomena in the geometric optimization of the L1 counter-rotating fan. The fundamental question that will be addressed in the thesis is how to extend the hybrid CFD-analytic methods to predict noise from an airfoil in a uniform turbulent flow to the case of tonal and broadband wake-interaction noise and trailing-edge broadband noise in low-speed fans. It will be shown that it is possible to provide a fast and reasonably accurate prediction of the spectrum of noise emitted by low-speed fans by extracting flow data from Reynolds Averaged Navier-Stokes (RANS) simulations and using them as input to Amiet's analytic formulation, provided that this has been carefully adapted to the studied noise generation phenomenon, i.e. the interaction of the leading-edge of a fan blade with an incoming wake or of the trailing-edge with the turbulent boundary layer over the blade surface. Concerning the methodology, both noise generation mechanisms will first be modeled with analytic functions, then the necessary flow field input will be extracted from RANS simulations and the models will be validated with respect to experimental data, whenever possible, or to higher fidelity simulations. The last step of the project is the application of these noise prediction methods to the shape optimization of the L-1 fan blades by means of a genetic algorithm. The sensitivity analysis of the design parameters and of the constraints used in the optimization process provides a new perspective on the multi-objective efficiency-noise optimization approach which will be increasingly used in turbomachinery design in the future.
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Books on the topic "Ventilation – Noise"

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I͡Udin, E. I͡A. Borʹba s shumom shakhtnykh ventili͡atornykh ustanovok. 2nd ed. Moskva: "Nedra", 1985.

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American Society of Heating, Refrigerating and Air-Conditioning Engineers., ed. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1993.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. 2nd ed. Atlanta, GA: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, 2011.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1991.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1991.

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Munjal, M. L. Acoustics of ducts and mufflers with application to exhaust and ventilation system design. New York: Wiley, 1987.

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Reynolds, Douglas D. Algorithms for HVAC acoustics. Atlanta, Ga: American Society of Heating, Refrigerating and Air-Conditioning Engineers, 1991.

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Chartered Institution of Building Services Engineers., ed. Noise and vibration control for HVAC. London: CIBSE, 2002.

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A Practical Guide to Noise and Vibration Control for Hvac Systems. 2nd ed. Amer Society of Heating, 2005.

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Sheet Metal and Air Conditioning Contractors' National Association (U.S.), ed. HVAC sound and vibration manual. Chantilly, VA: Sheet Metal and Air Conditioning Contractor's National Association, 2004.

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Book chapters on the topic "Ventilation – Noise"

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Hoover, R. M., and R. H. Keith. "Noise Control for Mechanical and Ventilation Systems." In Encyclopedia of Acoustics, 1219–41. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470172537.ch98.

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Beda, Alessandro, Peter M. Spieth, Thomas Handzsuj, Paolo Pelosi, Nadja C. Carvalho, Edmund Koch, Thea Koch, and Marcelo Gama de Abreu. "An adaptive controller for noisy pressure controlled ventilation." In IFMBE Proceedings, 50–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03885-3_14.

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Cory, WTW (Bill). "Fan noise." In Fans and Ventilation, 215–37. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044626-4/50016-4.

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"1Chapter 1 Noise and Ventilation." In Developing a Safety and Health Program, 107–18. CRC Press, 2009. http://dx.doi.org/10.1201/b15109-15.

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Portela, Filipe, Manuel Filipe Santos, António da Silva Abelha, José Machado, and Fernando Rua. "Data Quality and Critical Events in Ventilation." In Hospital Management and Emergency Medicine, 112–21. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2451-0.ch007.

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The data quality assessment is a critical task in Intensive Care Units (ICUs). In the ICUs the patients are continuously monitored and the values are collected in real-time through data streaming processes. In the case of ventilation, the ventilator is monitoring the patient respiratory system and then a gateway receives the monitored values. This process can collect any values, noise values or values that can have clinical significance, for example, when a patient is having a critical event associated with the respiratory system. In this paper, the critical events concept was applied to the ventilation system, and a quality assessment of the collected data was performed when a new value arrived. Some interesting results were achieved: 56.59% of the events were critical, and 5% of the data collected were noise values. In this field, Average Ventilation Pressure and Peak flow are respectively the variables with the most influence.
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Peng, Syd S. "Ventilation and methane, dust, and noise controls." In Longwall Mining, 387–436. CRC Press, 2019. http://dx.doi.org/10.1201/9780429260049-11.

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Wilson, Michael, Fergus Nicol, John Solomon, and John Shelton. "Noise Level and Natural Ventilation Potential in Street Canyons." In Natural Ventilation in the Urban Environment, 103–23. Routledge, 2012. http://dx.doi.org/10.4324/9781849772068-5.

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Dehra, Himanshu. "Solar Energy Conversion and Noise Characterization in Photovoltaic Devices with Ventilation." In Recent Developments in Photovoltaic Materials and Devices. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.79706.

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Price, A. J., and Malcolm J. Crocker. "Noise Control in Heating and Ventilating Systems." In Noise and Noise Control, 137–79. CRC Press, 2018. http://dx.doi.org/10.1201/9781351074995-3.

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Jackson, Chandra L. "Housing Conditions as Environmental and Social Determinants of Sleep Health." In The Social Epidemiology of Sleep, 373–408. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190930448.003.0014.

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The home environment is an important yet understudied determinant of sleep health. Although little is known about the living conditions that negatively affect sleep, many naturally occurring and artificial external factors in a person’s immediate physical and social sleeping environment can impact his or her sleep health and subsequent acute as well as chronic risk of disease and premature mortality. Using the socioecological model as a framework, this chapter discusses the indoor and immediate outdoor physical surroundings of spaces used for shelter including exposure to light and noise pollution, suboptimal room temperature/humidity, poor air quality, improper ventilation, and subpar mattress quality. Household crowding, safety, and housing insecurity are among social conditions of the living quarters that are also discussed as the aforementioned exposures may negatively impact sleep health across the life course. Published observational as well as experimental research findings investigating the impact of these factors on various sleep dimensions along with their potential impact on disease and mortality risk are also discussed before identifying important gaps in the current literature and providing future research directions.
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Conference papers on the topic "Ventilation – Noise"

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Alexandrov, Y. B., V. A. Sychenkov, R. R. Khaliulin, W. M. Yousef, and S. A. Semichev. "Ventilation systems noise reduction issue." In 2020 International Conference on Dynamics and Vibroacoustics of Machines (DVM). IEEE, 2020. http://dx.doi.org/10.1109/dvm49764.2020.9243922.

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Butera, Frank, and Keith Hewett. "Acoustic Performance of Louvred Facades for Brisbane Domestic Airport: An Integrated Approach." In ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-1393.

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Maximising cross ventilation is a low energy method of naturally ventilating and providing heating and cooling to deep plan spaces. Significant reduction in the emission of greenhouse gases can be achieved through minimising the use of mechanical systems in regions with climatic conditions that support the use of natural ventilation. Arup has provided input into the design of a louvered facade for the control of external noise for Brisbane Domestic Airport. A full scale prototype facade was constructed and noise transmission loss measurements were undertaken. The results indicate that significant noise reduction can be achieved to enable compliance with the internal noise limits for airport terminals, whilst using natural ventilation. The findings from this research will directly benefit building designers and innovators in the pursuit of achieving sustainable building design.
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Gaab, Oliver, Delf Sachau, and Oliver Pabst. "Active Noise Reduction in Ventilation Ducts." In 160th Meeting Acoustical Society of America. Acoustical Society of America, 2010. http://dx.doi.org/10.1121/1.3543875.

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Suki, Béla. "Noisy Ventilation Improves Lung Function." In UNSOLVED PROBLEMS OF NOISE AND FLUCTUATIONS: UPoN 2002: Third International Conference on Unsolved Problems of Noise and Fluctuations in Physics, Biology, and High Technology. AIP, 2003. http://dx.doi.org/10.1063/1.1584914.

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Park, Jeongyoung, and Hyundong Lee. "Numerical Simulations of Whistle Noise from Air Ventilation Duct." In SAE 2005 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-2496.

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Martins, A. M., and A. C. Mendes. "Assessment of aerodynamic noise in an industrial ventilation system." In ADVANCES IN FLUID MECHANICS 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/afm06046.

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Fayuan, Wu, Jun Cai, Liu Ping, Fang Ming, Zhou Jinquan, Xu Rui, and Deng Yongqiang. "Analysis and Control of Noise Reduction and Ventilation for Indoor Substation." In 2017 International Conference on Smart Grid and Electrical Automation (ICSGEA). IEEE, 2017. http://dx.doi.org/10.1109/icsgea.2017.36.

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Zhao Ling and Tang Minkang. "Application of impedance complex muffler in noise control of mine ventilation shaft." In 2011 International Symposium on Water Resource and Environmental Protection (ISWREP). IEEE, 2011. http://dx.doi.org/10.1109/iswrep.2011.5893372.

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Keming, Ye, and Luo Hanbin. "Noise Reduction and Ventilation System: A Design of a New Intelligent Window." In Creative Construction e-Conference 2020. Online: Budapest University of Technology and Economics, 2020. http://dx.doi.org/10.3311/ccc2020-063.

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Herther, Joseph C., and Stephen P. Gent. "Computational Aeroacoustic Analysis of a Heating Coil Within a Ventilation Duct." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21603.

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This study computationally investigates the sound generation of air flow through a heating coil within a ventilation duct. Noise sources originating from unsteady flow through the centrifugal fan, heating coil, and ducting are identified with steady RANS techniques using a commercially available CFD solver. Built-in aeroacoustic modules are used to refine the mesh to resolve acoustic frequencies in the computational model. Sound spectral analysis is performed in the near field. With the continued exponential progression of technology, computational numerical models become increasingly more applicable and practical to a larger variety of engineering problems. Traditionally, aeroacoustic analysis has been performed on noise sources such as aircraft. However, more interest into acoustic source modeling in other fields has expanded. For example, wind turbines, automotive sources such as rear view mirrors, HVAC systems, and other noise generating devices. As the population continues to grow it is of interest to characterize the acoustics of HVAC equipment, in the future, to prevent unwanted noise within buildings. Furthermore, the inquiry is to question the practicality of computational aeroacoustic methods, which are known to be computationally intensive, for industrial use in HVAC design.
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