Relevant bibliographies by topics / Experimental acoustics

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Experimental acoustics'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Experimental acoustics"

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Doige, A. G., and H. S. Alves. "Experimental Characterization of Noise Sources for Duct Acoustics." Journal of Vibration and Acoustics 111, no. 1 (January 1, 1989): 108–14. http://dx.doi.org/10.1115/1.3269804.

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Many industrial applications involving the acoustics of ducting or piping systems require an improved description of noise sources, so that a better prediction and evaluation of system performance can be achieved. Some examples are (a) the computer simulation of intake and exhaust muffler performance, (b) the control of pressure pulsation in fluid piping systems due to control valve flow noise or reciprocating compressors, and (c) predicting pressure fluctuations in heating and air-conditioning system ductwork due to various types of fans or blowers. This paper describes two applications of a well-known linear electrical analogy for obtaining experimentally the internal acoustical source impedance and the strength of the source, both parameters which are independent of the acoustic system load impedance. Two methods are compared, one which utilizes direct measurement of source impedance with the source inactive, and a two-load method from which the source impedance is calculated from measured pressures, with the source in operation. Various applications are presented using a speaker, compressor, engine, and centrifugal fan as noise sources connected to different load impedances. Comparisons are made to highlight the relative merits of these two approaches and to demonstrate the degree of accuracy that can be obtained in predicting noise levels in any arbitrary linear acoustic system, using the measured source parameters. The methods are simple in concept and in application, and while they do not often describe the physical nature of noise sources, they do offer a way to bypass the much more difficult problem of modelling the source theoretically.
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Fedenczuk, Tom, and Eva-Marie Nosal. "Hawaii Experimental Acoustics Range for Shallow Water Applications." Marine Technology Society Journal 45, no. 3 (May 1, 2011): 69–76. http://dx.doi.org/10.4031/mtsj.45.3.8.

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AbstractShallow water acoustics provide a means for monitoring and surveillance of near-shore environments. This paper describes the current and future capabilities of the low- to high-frequency Hawaii Experimental Acoustics Range (HEAR) that was designed to facilitate a wide range of different shallow water acoustics experiments and allow researchers from various institutions to test various array components and configurations. HEAR is a portable facility that consists of multiple hydrophones (12‐16) cabled independently to a common central node. The design allows for variable array configurations and deployments in three modes: experimental (off boats and piers), autonomous, and cabled. An application of HEAR is illustrated by the results from a deployment at Makai Research Pier, Oahu, Hawaii. In this deployment, HEAR was configured as a long-baseline range of two volumetric subarrays to study passive acoustic tracking capabilities in a shallow water environment.
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Stepanov, Robert, Vladimir Pakhov, Andrey Bozhenko, Andrey Batrakov, Lyaysan Garipova, Alexander Kusyumov, Sergey Mikhailov, and George N. Barakos. "Experimental and numerical study of rotor aeroacoustics." International Journal of Aeroacoustics 16, no. 6 (September 2017): 460–75. http://dx.doi.org/10.1177/1475472x17730447.

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The work documents recent experiments at the Kazan National Research Technical University named after A.N. Tupolev (Kazan Aviation Institute), related to helicopter acoustics. The objective is to measure nar-field acoustics of rotors in hover and provide data suitable for computational fluid dynamics validation. The obtained set of data corresponds to a scaled rotor of known planform and the results are of high resolution. An advantage of the current dataset is that direct near-field acoustic data is made available and this allows for easy and direct comparisons with computational fluid dynamics predictions, without the need to use far-field aeroacoustic methods.
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MA, FUYIN, JIU HUI WU, and HAIYUN HOU. "PROGRESS IN PHYSIOLOGICAL ACOUSTICS." Journal of Mechanics in Medicine and Biology 13, no. 05 (October 2013): 1340007. http://dx.doi.org/10.1142/s0219519413400071.

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Physiological acoustics is a very hot topic in modern acoustic research, which is to study the hearing mechanism and the utterance of both humans and animals. It could be divided into two main aspects: physical acoustics of the ear and physiological acoustics. In physiological acoustics, there are some common research methods, such as objective experimental testing, subjective feelings evaluation survey statistical method, building the physical acoustic model and numerical simulation methods, etc. The authors are researching the accurate mathematical model of equal loudness curves, critical band and masking effects, by applying the holographic concept with several biological factors which are required to build a standard model. The cochlear emission information should be extracted from wavelet analysis method and two hearing protection technologies are being developed by band shielding.
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Lauterborn, Werner, Thomas Kurz, and Ulrich Parlitz. "Experimental Nonlinear Physics." International Journal of Bifurcation and Chaos 07, no. 09 (September 1997): 2003–33. http://dx.doi.org/10.1142/s0218127497001539.

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The review gives and account of the historical development, the current state and possible future developments of experimental nonlinear physics, with emphasis on acoustics, hydrodynamics and optics. The concepts of nonlinear time-series analysis which are the basis of the analysis of experimental outcomes from nonlinear systems are explained and recent developments pertaining to such different fields as modeling, prediction, nonlinear noise reduction, detecting determinism, synchronization, and spatio-temporal time series are surveyed. An overview is given of experiments on acoustic cavitation, a field rich of nonlinear phenomena such as nonlinear oscillations, chaotic dynamics and structure formation, and one of the first physical systems to exhibit period-doubling and chaos in experiment.
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Campbell, Murray. "Cornett Acoustics: Some Experimental Studies." Galpin Society Journal 49 (March 1996): 180. http://dx.doi.org/10.2307/842398.

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Black, Andy Nicholas, and Robert H. Magruder. "An Experimental Introduction to Acoustics." Physics Teacher 55, no. 8 (November 2017): 482–84. http://dx.doi.org/10.1119/1.5008344.

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Pisharody, Rahul, and Anurag Gupta. "Experimental Investigations of Tānpurā Acoustics." Acta Acustica united with Acustica 104, no. 3 (May 1, 2018): 542–45. http://dx.doi.org/10.3813/aaa.919195.

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Yoshida, Takumi, Yasutaka Ueda, Norimasa Mori, and Yumi Matano. "An experimental study on acoustical performance of cross rib diffuser." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4538–45. http://dx.doi.org/10.3397/in-2021-2731.

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The preset paper proposes a novel acoustic diffuser which we call cross rib diffuser (CRD) and investigates its acoustical performance in rooms experimentally. CRD consists of overlapping two one-dimensional periodic rib diffuser (OPRD) with different structural configurations. CRD can achieve high scattering coefficient with wider frequency band than OPRD. Moreover, unlike other diffusers with high scattering property such as metadiffuser and two-dimensional quadratic diffuser, CRD keeps simple and familiar design of OPRD suitable for use in various architectural spaces. In the paper, we firstly evaluated random-incidence scattering coefficient of CRD using 1/5 scaled reverberation room. Then, random-incidence absorption coefficient was measured in 1/1 reverberation room. Finally, an implementation experiment was conducted to examine applicability of CRD in improving acoustics in small meeting room with small absorption treatments. The results indicated that CRD reduced EDT and reverberation time, and increased D50 more than JND values. Additionally, CRD improved reverberation and speech intelligibility more significantly than OPRD with same installation area.
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König, Ronja, André Gerlach, Henry Schmidt, and Eike Stumpf. "Experimental investigation on acoustics and efficiency of rotor configurations for electric aerial vehicles." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 323–34. http://dx.doi.org/10.3397/in-2021-1435.

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Aerial vehicles based on distributed electric propulsion systems have gained great interest. Their rotors however create loud and annoying sound, what obstructs market success. Variations in rotor configuration can be observed on emerging concepts, whereby the main varied parameters are blade radius, number of blades and blade distribution. The focus of this paper is to identify how these parameters can be chosen to optimize efficiency and acoustics, including psychoacoustic metrics and sound quality of single rotors while hovering. Results from experimental investigations done in a hover-test-bench are presented. Rectangular, symmetric blades are used. Experiments are done varying blade radius (61mm to 126 mm), number of blades (2 to 8) and blade distribution (equal and unequal angles). Acoustic measurements are analyzed regarding microphone position, sound pressure level, spectral characteristics, psychoacoustic metrics and selected sound quality models. Results show, that variations in blade radius, number of blades and blade distribution can improve efficiency and acoustics. Influence of these parameters on the acoustic signature at constant rotational speed and at constant thrust is discussed. Conclusions for optimized rotor design at aerial vehicles are derived and supplemented by resulting boundary conditions like building space and weight.
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Dissertations / Theses on the topic "Experimental acoustics"

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Abrahamson, Scott. "Automated psycho-acoustic experimental station." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/19566.

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Maier, Christian. "Experimental and theoretical aero-acoustics." Thesis, Glasgow Caledonian University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601630.

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Acoustic noise problems are encountered in many fields and are very often undesirable. The localisation of sound sources is the first step 10 reducing noise problems. In this thesis, the ability and feasibility of an acoustic camera in this regard is demonstrated The acoustic camera deals with the problem of sound sources coming from different directions by estimating the sound contributions incident to the acoustic camera. One example of an aero-acoustic noise problem is an air plane with its air foil. These cause unwanted noise due 10 the flowed air. Or another example is the current collector on trains which causes unwanted noise as well as affecting driving. Another problem, dealt with later in this thesis, is a cylinder flowed by air in a wind tunnel. A practical case 0/ this problem is a car antenna in the form of a cylinder; this causes noise due to the driving wind Fans can be optimised for aero-acoustics as well - an example is a cooling fan in a computer, or larger fans for air conditioners that can transport the noise over the whole tunnel in which they are built. Some processing techniques are used and implemented in the acoustic camera. The first technique is the "classical" Delay-and-Sum Beam/arming technique and the improved orthogonal beamforming, with the ability to separate non-correlated sound sources in a Single measurement. The second technique is based on the decomposition of the Eigenvalues of the cross spectral matrix. In addition to the experimental section of this thesis, the results are compared to a simulation, where a flowed object measured with the acoustic camera is compared to a suitable simulation with the same parameters like dimensions and velocity. Here f/owed means that a suitable object, a cylinder for example, is placed in the wind tunnel and flowed by air. The outcome of this thesis is the analysing of a flow induced problem, a fan for example. First steps were done with 2D flow simulations of a cylinder to become familiar with the topic program and implementing MATLAB® code to process the points of interest. This analysing could be done with a simulation or with the acoustic camera. The aim of this work is concerned with sound sources and the mechanism behind it. Suitable aero-acoustic experiments were chosen that can be analysed with the acoustic camera and with numerical simulation as well. With the acoustic camera, these sound sources can be visualised using the beamforming method A similar procedure should be done to the numerical simulations. These simulations are done and the sound sources are visualised there as well by rebuilt an array of microphones, which acts as acoustic camera, in the numerical simulations.
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Grothe, Timo. "Experimental Investigations of Bassoon Acoustics." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-150193.

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The bassoon is a conical woodwind instrument blown with a double-reed mouthpiece. The sound is generated by the periodic oscillation of the mouthpiece which excites the air column. The fundamental frequency of this oscillation is determined to a large extent by the resonances of the air column. These can be varied by opening or closing tone-holes. For any given tone hole setting a fine-tuning in pitch is necessary during playing. Musicians adjust the slit opening of the double-reed by pressing their lips against the opposing reed blades. These so-called embouchure corrections are required to tune the pitch, loudness and sound color of single notes. They may be tedious, especially if successive notes require inverse corrections. However, such corrections are essential: Due to the very high frequency sensitivity of the human ear playing in tune is the paramount requirement when playing music. This implies, that embouchure actions provide an important insight into a subjective quality assessment of reed wind instruments from the viewpoint of the musician: An instrument requiring only small corrections will be comfortable to play. Theoretical investigations of the whole system of resonator, reed, and musician by use of a physical model nowadays still seem insufficient with respect to the required precision. Therefore the path of well-described artificial mouth measurements has been chosen here. For the separate treatment of the resonator and the double-reed, existing classical models have been used. Modifications to these models are suggested and verified experimentally. The influence of the musician is incorporated by the lip force-dependent initial reed slit height. For this investigation a measurement setup has been built that allows precise adjustment of lip force during playing. With measurements of the artificial mouth parameters blowing pressure, mouthpiece pressure, volume-flow rate and axial lip position on reed, the experiment is fully described for a given resonator setting represented by an input impedance curve. By use of the suggested empirical model the adjustment parameters can be turned into model parameters. A large data set from blowing experiments covering the full tonal and dynamical range on five modern German bassoons of different make is given and interpreted. The experimental data presented with this work can be a basis for extending the knowledge and understanding of the interaction of instrument, mouthpiece and player. On the one hand, they provide an objective insight into tuning aspects of the studied bassoons. On the other hand the experiments define working points of the coupled system by means of quasi-static model parameters. These may be useful to validate dynamical physical models in further studies. The experimental data provide an important prerequisite for scientific proposals of optimizations of the bassoon and other reed wind instruments. It can further serve as a fundament for the interdisciplinary communication between musicians, musical instrument makers and scientists.
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KULKARNI, PRASHANT M. "EXPERIMENTAL FORMULATION OF FOUR-POLE PARAMETERS FOR ANALYTICAL-EXPERIMENTAL HYBRID MODELING OF ACOUSTIC SYSTEMS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1069348253.

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Pundarika, G. "Experimental And Theoretical Studies On Jet Acoustics." Thesis, Indian Institute of Science, 2001. http://hdl.handle.net/2005/250.

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A systematic research on aeroacoustics conducted around the world for the last few decades has revealed various inherent characteristics of the jet noise radiation. However, a lot more needs to be done for the theoretical as well as experimental predictions of various jet noise features based on actual flow details. The work reported in the present thesis is an attempt in this direction. A critical study of existing literature on jet noise shows that none of the general wave equations lends itself easily for predictions of all the jet noise features. It is shown that while LighthilPs classical acoustic analogy approach, with some reasonable approximations, can be used to yield most of the information needed by the engineers, the convected wave equations of Phillips and Lilley are required to study the acoustic radiation in what has come to be known as "Refraction valley" or "Cone of relative silence". The characteristics of the sound field of underexpanded cold jet impingement flows were studied by measuring the noise emanating from two convergent nozzles of throat diameter 2.5 mm and 5 mm each and a convergent - divergent nozzle of exit diameter of 6.49 mm, when the jet impinges on a flat plate kept perpendicular to the direction of the jet. The measurements were conducted upstream of the nozzle over an extensive envelope of jet operating conditions such as chamber stagnation pressure, mass flow rate through the nozzle and diameter of the nozzle. The source strength at the jet boundary was obtained by measuring acoustic pressure amplitude close to the jet contour assuming it as locally cylindrical. Particular attention was focussed on backward projection of the sound field on to a cylindrical surface. This is the application of acoustic holography to study the sound radiation in the audio frequency region. With the help of FFT and software developed for this purpose, the theoretical predictions using data from several cylindrical surfaces were compared. A detailed analysis of noise radiation from a cold sonic and supersonic free jet was also carried out. The experimental work involved the measurement of noise field from a 2.5 mm, 5 mm convergent and a convergent - divergent nozzle of exit diameter of 6.49 mm and area ratio 1.687 for designed Mach number of two. The experimental setup consisted essentially of a pressure chamber made of mild steel, designed to withstand 50 bar pressure. This chamber is a cylinder with dia 0.421 m and length 0.85 m. The nozzles were made of mild steel. Compressed air approximately at room temperature is supplied to the nozzle via a control valve. The measuring and recording instruments consists of B & K Microphones, Preamplifiers, Conditioning amplifier and a Mediator, which measure a Sound Pressure Level at a point. The nozzles were operated at pressure ratio upto 25 bar. The noise signal was processed through 12 channel data acquisition system. Acoustic pressure and SPL were" calculated using theoretical relations and software developed. Using this software Fast Fourier Transformations of raw signal was obtained from 20 Hz to 20 kHz. Also constant SPL contour graphs were obtained. Source strength distribution at the jet boundary has been obtained by the principle of acoustic holography. Experimental values are closely matching with the results obtained by acoustic holography. The percentage error for acoustic pressure and SPL were less than 12%. The experimental results were used to obtain the source distribution in terms of gross jet parameters.
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Zhang, Wei. "Simulation and experimental study of room acoustics." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27311.

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Sound propagation is a complex subject, especially in an enclosure. The study of room acoustics involves not only a research into how sound is propagated in a room, but also a search into how to measure sound under different condition and how to control sound in the case of various wall materials. For an acoustical environment, there are three separated parts: sound sources, room acoustics, and the listens. These three items form a source-medium-receiver chain, which is typical for most of communication models. In this thesis, the image method is applied to predict the acoustical quality of a real room, and the experiment for room acoustic measurement is set up. The simulation model using image method proved the design of the measurement system is efficient for room acoustics.
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Blandin, Rémi. "Theoretical and experimental study of vocal tract acoustics." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT102/document.

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L'acoustique du conduit vocal est souvent décrite avec de simples modèles ondes planes à une dimension. Cependant, cela n'est pas satisfaisant quand à haute fréquence (à partir d'environ 5 kHz) des variations tridimensionnelles du champ acoustique sont présentes. La théorie acoustique multimodale a été implémentée pour prendre en compte les aspects tridimensionnels de l'acoustique du conduit vocal.Un système expérimental a été conçu pour mesurer avec précision des fonctions de transfert, des champs de pression et des diagrammes de directivité sur des maquettes de conduits vocaux. Les données expérimentales obtenues ont été comparées avec les simulations réalisées avec la théorie implémentée et avec la méthode des éléments finis. Le champ acoustique tridimensionnel et les diagrammes de directivité ont été prédit avec succès par les deux méthodes de simulation. Il a été observé que la propagation de mode acoustique d'ordre supérieur induit des variations tridimensionnelles du champ acoustique, génère des antirésonances et des résonances additionnelles et affecte la directivité du son rayonné de façon significative. L'excentricité de la forme du conduit vocal apparaît comme critique pour l'excitation et la propagation des modes d'ordre supérieur.Il est conclu qu'à haute fréquence (au-delà de 5 kHz), la fonction de transfert du conduit vocal peut avoir des variations significatives dans des intervalles de fréquences petit (de l'ordre de 100 Hz) et dans des régions angulaires restreintes (de l'ordre de 30°) qui nécessitent d'être prise en compte dans les études de la parole qui se focalisent sur les hautes fréquences
The vocal tract acoustics is often described witha simple one dimensional plane wave approach.However, this is not satisfying when at high frequency(from about 5 kHz) three dimensional variations ofthe acoustic fieldare present. The multimodal acoustic theory has beenimplemented in order to account for the threedimensional aspects ofthe vocal tract acoustics.An experimental setup has been designed to measure accuratelytransfer functions, pressure field maps and directivitypatterns of vocal tract replicas.The experimental data obtained have been compared withsimulations performed with the implemented theory andwith a finite element method.The three dimensional acoustic fields and the directivitypatterns were successfully predicted by both simulationmethods.It has been observed that the propagation of higher orderacoustical modes, induces three dimensional variations ofthe acoustic field, generates anti-resonances andadditional resonances, and significantly affects the directivityof the radiated sound.The eccentricity of thevocal tract shape appears as critical for the excitation and thepropagation of the higher order acoustical modes.It is concluded thatat high frequency (above 5 kHz), the transfer functionof the vocal tract can have significant variationswithin short frequency intervals (of the order of 100Hz) and within small angular regions (of the order of30°) which need to be taken into account inthe studies of speech which focus on high frequencies
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Grialou, Matthieu. "Vibro-acoustics substructuring : Combining simulations and experimental identification of subdomains for low frequency vehicle acoustics." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI109/document.

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La sonorité de l’échappement joue un rôle significatif sur le confort acoustique des occupants, ainsi que sur le caractère du véhicule. L’étude proposée porte sur la problématique industrielle suivante : « Description et quantification de la transmission du son entre la bouche d’échappement et l’intérieur du véhicule ». Physiquement la transmission sonore entre l’échappement et l’intérieur du véhicule s’effectue en trois étapes : Propagation des ondes sonores de la canule à la surface extérieure du véhicule et conversion en énergie vibratoire (1) ; Le bruit structurel se propage de la peau extérieure du véhicule à l’habillage intérieur (2) ; La surface intérieure du véhicule rayonne de l’énergie dans l’air à l’intérieur (3). Dans l’état de l’art proposé, la méthode de sous-structuration vibro-acoustique Patch Transfer Functions (PTF) est considérée comme une alternative viable à la problématique proposée. Cependant, avant d’appliquer la méthode sur un véhicule complet, la problématique suivante devait être résolue : « Caractérisation expérimentale d’un sous-système par des mesures sur un système couplé ». Ce manuscrit propose une méthode originale pour mesurer des fonctions de transfert d’un système découplé, sur la base de la réponse d’un système couplé. En raison de la nature mal posée du problème inverse, une méthode originale de régularisation a été proposée. La méthode a été validée pas des essais numériques, puis par un test physique
Exhaust noise has a significant impact on acoustic comfort and the sound identity of a vehicle brand. The present study focuses on the: “Description and quantification of the sound transmission from the exhaust outlet into the interior of a vehicle”. Physically the noise propagation from the exhaust pipe to the cabin consists of three steps: The sound waves propagate through the air from the exhaust outlet to the external skin of the vehicle (1); the external skin vibrates and transmits its vibration to the internal skin (2); the internal skin radiates sound in the passengers’ cabin (3). The Patch Transfer Functions method, which is based on the framework of dynamic substructuring, allows for the consideration of this complex problem as simpler subproblems that consist of subsystem interactions. Yet the application of the method to a full vehicle requires addressing the problem: “Characterization of Patch Transfer Functions of a subsystem by means of measurement on a coupled system”. This dissertation presents an original inverse method for the measurement of Patch Transfer Functions. In industrial structures, this in-situ characterization is generally the only possible measurement method. Yet, due to the ill posed nature of the problem, the inversion process is difficult. An original regularization method is proposed. The method is tested through numerical simulations, and is validated with an experimental setup
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Sack, Stefan. "Experimental and Numerical Multi-port Eduction for Duct Acoustics." Doctoral thesis, KTH, Linné Flow Center, FLOW, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207475.

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Sound generation and propagation in circular ducts for frequencies beyond the cut-on frequencies of several higher order acoustic modes is investigated. To achieve this, experimental and numerical set-ups are designed and used to research aeroacoustic interactions between in-duct components and to conceive noise mitigation strategies. Describing in-duct sound for frequencies with a moderate number of propagating modes is important, for example, for improving the noise emission from mid-size ventilation systems. Challenges that are largely unacknowledged in the literature involve efficient test rig design, quantification of limits in the methods, numerical modelling, and development of effective noise mitigation strategies for higher order modes. In this thesis, in-duct sound is mapped on a set of propagating pressure eigenmodes to describe aeroacoustic components as multi-ports with sound scattering (passive properties) and a source strength (active properties). The presented analysis includes genetic algorithms and Monte Carlo Methods for test rig enhancement and evaluation, multi-port network predictions to identify model limitations, and scale resolving (IDDES) and Linearized Navier Stokes computations for numerical multi-port eduction and the silencer design. It is first shown that test rig optimization improves the quality of multi-port data significantly. Subsequently, measurements on orifice plates are used to test the network prediction model. The model works with high accuracy for two components that are sufficiently separated. For small separations, strong coupling effects are observed for the source strength but not for the scattering of sound. The measurements are used for numerical validation, which gives reliable results for coupled and uncoupled systems. The total acoustic power of tandem orifices is predicted with less than 2 dB deviation and the passive properties for most frequencies with less than 5 % difference from the measurement. The numerical (FEM) models are also used to design a completely integrated silencer for spinning modes that is based on micro-perforated plates and gives broadband attenuation of 3-6 dB per duct diameter silencer length. The multi-port method is a powerful tool when describing aerodynamically decoupled in-duct components in the low- to mid-frequency range. Due to a robust passive network prediction, multi-port methods are particular interesting for the design of silencer stages. Furthermore, the demonstrated applicability to numerical data opens novel application areas.

QC 20170522


IdealVent
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Ingemanson, Megan Lynn. "Experimental Characterization of Wind Turbine Blade Aerodynamic Noise." Thesis, University of California, Davis, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1539643.

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Wind turbine noise at low frequencies less than 300Hz is not only annoying to humans but has been proven to cause serious health issues. Additionally, animals are severely affected by wind turbines because a small increase in ambient noise (as is produced by wind turbines) significantly reduces their listening ability. In an attempt to better understand and characterize the aerodynamic noise of wind turbine blades, experimental testing was completed on PowerWorks 100kW and GudCraft WG700 blade specimens in the University of California, Davis Transportation Noise Control Center's anechoic chamber. Experimental testing and data analysis proved approximately 4.0dB to 6.0dB was produced due to the blades' geometric design for both blade specimens at low frequencies. This noise was maximized at the blades' leading edge along the central portion of the blades' radius. Theoretical prediction models have been used to determine that, for typical wind speeds and low frequencies, noise generated due to the tip passing frequency is clearly predominant.

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Books on the topic "Experimental acoustics"

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De Clerck, James, ed. Experimental Techniques, Rotating Machinery, and Acoustics, Volume 8. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15236-3.

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Caiti, A. Experimental Acoustic Inversion Methods for Exploration of the Shallow Water Environment. Dordrecht: Springer Netherlands, 2000.

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Meyer, Robert H. Experimental determination of transfer functions for a coated, ring stiffened cylinder as a function of hydrostatic pressure. Springfield, Va: Available from National Technical Information Service, 1997.

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Heinemann, Michael Gerhard. Experimental studies of applications of time-reversal acoustics to non-coherent underwater communications. Monterey, Calif: Naval Postgraduate School, 2000.

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Ambedkar, B. Ultrasonic Coal-Wash for De-Ashing and De-Sulfurization: Experimental Investigation and Mechanistic Modeling. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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Hadley, Kevin C. Technical manual for the experimental acoustic flow monitor. Vancouver, Wash: U.S. Geological Survey, 1995.

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Hadley, Kevin C. Technical manual for the experimental acoustic flow monitor. Vancouver, Wash: U.S. Geological Survey, 1995.

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Darling, David J. Sounds interesting: The science of acoustics. New York: Dillon Press, 1991.

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Parrott, Tony L. Experimental validation of a two-dimensional shear-flow model for determining acoustic impedance. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1987.

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Lamczyk, Mark Anthony. Experimental and numerical investigations of the Gaussian suppression of sound by sound. Monterey, Calif: Naval Postgraduate School, 1997.

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Book chapters on the topic "Experimental acoustics"

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van der Kooij, J. "Experimental and Analytical Aspects of Propeller Induced Pressure Fluctuations." In Shipboard Acoustics, 43–62. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3515-0_3.

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Remington, Paul J. "Experimental and Theoretical Studies of Vibrating Systems." In Encyclopedia of Acoustics, 715–34. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470172520.ch63.

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Mandelis, Andreas, and Kwan F. Leung. "Photothermal-Wave Diffraction and Interference in Condensed Media: Experimental Evidence in Aluminum." In Physical Acoustics, 489–95. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-9573-1_64.

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Jungman, A., Ph Guy, G. Quentin, and J. C. Le Flour. "Experimental Study of Reflected Beam Profile by Two-Layer Plate Systems Immersed in Water." In Physical Acoustics, 391–97. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-9573-1_49.

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Dréan, J. M., and M. de Billy. "Experimental Study of Guided Waves Propagating at the Interface Between a Fluid Cylinder and a Liquid Medium." In Physical Acoustics, 297–305. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-9573-1_34.

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Nilsson, A. C. "Discussion on the paper given by: J. van der Kooij: Experimental and Analytical Aspects of Propeller Induced Pressure Fluctuations." In Shipboard Acoustics, 495–97. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3515-0_32.

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Doolittle, R., A. Tolstoy, and M. Buckingham. "Experimental Confirmation of Horizontal Refraction of Sound Propagation in a Wedge-Like Ocean." In Ocean Seismo-Acoustics, 169–78. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2201-6_17.

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Schaaf, K., D. Ronneberger, and W. Pflüger. "Non-Steady Flow Over a Trailing Edge — An Experimental Study." In Aero- and Hydro-Acoustics, 29–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82758-7_4.

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Schmidt, Henrik, and Finn B. Jensen. "Evaluation of Experimental Techniques for Determining the Plane Wave Reflection Coefficient at the Sea Floor." In Ocean Seismo-Acoustics, 721–30. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2201-6_69.

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Katsnelson, Boris, Valery Petnikov, and James Lynch. "Equipment for Shallow Water Acoustics and Experimental Considerations." In Fundamentals of Shallow Water Acoustics, 397–423. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-1-4419-9777-7_10.

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Conference papers on the topic "Experimental acoustics"

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Aristodemou, Andrie, Angelandria Savva, and Charalambos Themistocleous. "The acoustics of Cypriot Greek fricatives." In 6th Tutorial and Research Workshop on Experimental Linguistics. ExLing Society, 2019. http://dx.doi.org/10.36505/exling-2015/06/0003/000240.

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Capitão Silva, Susana M., Luis M. T. Jesus, and Mário A. L. Alves. "Acoustics of speech and environmental Sounds." In ExLing 2006: 1st Tutorial and Research Workshop on Experimental Linguistics. ExLing Society, 2019. http://dx.doi.org/10.36505/exling-2006/01/0049/000049.

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Chien, Eugene, and Jia Yu. "Experimental/computational study of fluid dynamics and acoustics of perforate acoustic liner." In 7th AIAA/CEAS Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-2264.

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Barbaresi, Luca, Federica Morandi, Massimo Garai, and Alice Speranza. "Experimental measurements of flanking transmission in CLT structures." In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000433.

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Bellet, Romain, Bruno Cochelin, Philippe Herzog, and Pierre-Olivier Mattei. "Experimental Study of Energy Pumping in Acoustics." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34805.

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This paper presents an experimental vibro-acoustic set-up that aims to reproduce the energy pumping phenomenon between an acoustic medium and an essentially nonlinear oscillator. It shows a one-way irreversible transfer of energy between the first acoustic mode in a tube and a thin visco-elastic membrane. Various observed aspects of energy pumping are presented: behaviors under sinusoidal forcing, pumping threshold, resonance capture and transient response.
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Kim, Taehyung, Jonghoon Jeon, Sunghan Chu, Sunghoon Kim, and Wonho Joo. "Numerical and experimental predictions of underwater propeller radiated noise." In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000430.

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Real, Gaultier, Dominique Fattaccioli, Xavier Cristol, and Dominique Habault. "Decoherence effects in 3D fluctuating environments: Numerical and experimental study." In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2017. http://dx.doi.org/10.1121/2.0000893.

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Sadiq, Salman, and Xiong-Liang Yao. "Combined Acoustic and Hydrodynamic Experimental Data Acquisition in Towing Tank: Moonpool Experiments." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57419.

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Time and cost effective experimental verification and accuracy procedures are the first and utmost requirements in ship building research conducted in towing tank. This paper presents towing tank experimental setup and procedures to acquire acoustic and hydrodynamic data at the same time for a moonpool experiment. The same technique can be applied on a variety of configurations to acquire combined acoustic and hydrodynamic data. In present work the experimental technique possesses the ability to monitor pressure fluctuations, acoustics, free surface wave height inside a moonpool and structural vibration of a moonpool model at the same time with a better estimation and accuracy. The results are compared with numerical modeling, empirical relations and a detailed collected data comparison analysis is given in light of ‘Empirical Mode Decomposition’ (EMD) method. Collected data from sensors are proved to be in engineering practice limits proving the importance and authenticity of the data acquisition procedure discussed here. We believe that the results and methods given in this paper have surely a permanent space in the technical literature.
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Shannon, Daniel, and Scott Morris. "Experimental Investigation of Slotted Circulation Control Airfoil Acoustics." In 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-2815.

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Hao, Xiaolong, Xiaodong Ju, Xiling Wu, Junqiang Lu, Baiyong Men, Jianlin Ben, and Zhijun Yu. "Experimental study of acoustic array sonde in borehole azimuthal reflection logging tool." In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000349.

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Reports on the topic "Experimental acoustics"

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Pantea, Cristian. Postdoctoral positions in Experimental Physics - Acoustics at Los Alamos National Laboratory. Office of Scientific and Technical Information (OSTI), May 2018. http://dx.doi.org/10.2172/1438155.

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Spikes, Clayton H., Cheryl L. Schroeder, Kathleen J. Raposa, and Stanley Labak. Ocean Acoustics Experimental Support Services for ONR's Ocean Battlespace Sensing Department. Fort Belvoir, VA: Defense Technical Information Center, September 2009. http://dx.doi.org/10.21236/ada531943.

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Blevins, Matthew, Gregory Lyons, Carl Hart, and Michael White. Optical and acoustical measurement of ballistic noise signatures. Engineer Research and Development Center (U.S.), January 2021. http://dx.doi.org/10.21079/11681/39501.

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Supersonic projectiles in air generate acoustical signatures that are fundamentally related to the projectile’s shape, size, and velocity. These characteristics influence various mechanisms involved in the generation, propagation, decay, and coalescence of acoustic waves. To understand the relationships between projectile shape, size, velocity, and the physical mechanisms involved, an experimental effort captured the acoustic field produced by a range of supersonic projectiles using both conventional pressure sensors and a schlieren imaging system. The results of this ongoing project will elucidate those fundamental mechanisms, enabling more sophisticated tools for detection, classification, localization, and tracking. This paper details the experimental setup, data collection, and preliminary analysis of a series of ballistic projectiles, both idealized and currently in use by the U.S. Military.
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Lindwall, Dennis, Richard Keiffer, Warren Wood, and Robert Zingarelli. Acoustic-Elastic Scattering Predictions and Experimental Verifications via Water Tank Experiments. Fort Belvoir, VA: Defense Technical Information Center, July 2004. http://dx.doi.org/10.21236/ada461298.

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Deane, Grant B. Bubbles and Acoustics Communications Experiment: The Acoustical and Physical Characterization of Bubble Plumes. Fort Belvoir, VA: Defense Technical Information Center, August 2002. http://dx.doi.org/10.21236/ada627235.

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Lynch, James F. SW06 Shallow Water Acoustics Experiment. Fort Belvoir, VA: Defense Technical Information Center, September 2008. http://dx.doi.org/10.21236/ada533150.

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Lynch, James F. SW06 Shallow Water Acoustics Experiment. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada541764.

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Costley, D., Luis De Jesús Díaz,, Sarah McComas, Christopher Simpson, James Johnson, and Mihan McKenna. Multi-objective source scaling experiment. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40824.

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The U.S. Army Engineer Research and Development Center (ERDC) performed an experiment at a site near Vicksburg, MS, during May 2014. Explosive charges were detonated, and the shock and acoustic waves were detected with pressure and infrasound sensors stationed at various distances from the source, i.e., from 3 m to 14.5 km. One objective of the experiment was to investigate the evolution of the shock wave produced by the explosion to the acoustic wavefront detected several kilometers from the detonation site. Another objective was to compare the effectiveness of different wind filter strategies. Toward this end, several sensors were deployed near each other, approximately 8 km from the site of the explosion. These sensors used different types of wind filters, including the different lengths of porous hoses, a bag of rocks, a foam pillow, and no filter. In addition, seismic and acoustic waves produced by the explosions were recorded with seismometers located at various distances from the source. The suitability of these sensors for measuring low-frequency acoustic waves was investigated.
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Hodgkiss, W. S., and J. A. Hildebrand. Acoustic Reverberation Experiment Planning. Fort Belvoir, VA: Defense Technical Information Center, November 1991. http://dx.doi.org/10.21236/ada244784.

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Knobles, David P. Shallow Water Acoustic Experiment Analysis. Fort Belvoir, VA: Defense Technical Information Center, September 2009. http://dx.doi.org/10.21236/ada531972.

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