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Topic: Aeroacoustics

	Aeroacoustics Laboratory in KAIST
		"Aeroacoustics is concerned with sound generated by aerodynamic forces or motions originating in a flow rather than by the externally applied forces or motions of classical acoustics.
		The multidisciplinary nature of aeroacoustics has probably been responsible for the slow recognition of the subject, particularly in Engineering where a comprehensive understanding is required if problems associated with environmental noise, industrial injury due to hearing loss and some types of machinery failure are to be avoided.
		Of greater interest in connection with aeroacoustics is the instability of the wakes of immersed bodies and the consequent formation of vortices as this is frequently the source of excitation of mechanical and/or acoustic resonances which often result in Sound Pressure Levels up to 165 dB being generated by flow at low subsonic velocities.
	acoustic.kaist.ac.kr /home/intro.php (341 words)

	Re: PhD in aeroacoustics
		Aeroacoustics as applied to aeronautical engineering has been an active field for about 15 years.
		In a well established but evolving field like aeroacoustics progress is nearly always to be made by developing and refining the ideas of those that are currently active in the field.
		Aeroacoustics is part of my work but without knowing your environment and circumstances it is very difficult to make any worthwhile suggestions at the level of writing a proposal (for a grant).
	www.cfd-online.com /Forum/main_archive.cgi?read=43069 (375 words)

	Aeroacoustics - Wikipedia, the free encyclopedia
		Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or by aerodynamic forces interacting with surfaces.
		Although no complete rational scientific theory of the generation of noise by aerodynamic flows has yet prevailed, most practical aeroacoustic analyses rely upon the so-called Acoustic analogy whereby the governing equations of fluid dynamics are combined with the wave equation of classical acoustics.
		Although various such analogies currently exist, by far the most common and widely used is Lighthill's aeroacoustic analogy, first proposed by James Lighthill in the 1950s when noise generation associated with the jet engine was beginning to be placed under scientific scrutiny.
	en.wikipedia.org /wiki/Aeroacoustics (380 words)

	Research and Markets :: Research and Markets: Significant Advances in Aeroacoustics Required for Reducing Community and ...
		Aeroacoustics is a growing area and has received fresh emphasis due to advances in air, ground and space transportation.
		Significant advances in aeroacoustics are required for reducing community and cabin noise from subsonic aircraft and to prepare for the possible large scale entry of supersonic aircraft into civil aviation.
		Fundamental topics include advances in understanding aeroacoustics phenomena; applied topics include all aspects of civil and military aircraft, automobile and high speed train aeroacoustics, and the impact of acoustics on structures.
	sev.prnewswire.com /publishing-information-services/20050531/LNTU02031052005-1.html (494 words)

	eMercedesBenz - The Unofficial Mercedes-Benz Weblog
		For the purpose of performing the aeroacoustic measurements, the experts from Sindelfingen developed a concave mirror measuring three metres high whose multitude of microphones record the noise produced by the airstream as it flows over the vehicle body positioned five metres away.
		Whereas dozens of individual measurements would have been required to produce similar noise analyses previously, using the new concave mirror technique just a single measurement is sufficient to cover the A-pillar, exterior mirror, side window and roof, for instance.
		During testing, this state-of-the-art aeroacoustics measurement method was supplemented by the tried-and-tested artificial head technique: behind the wheel of the SLK sports car sat a dummy with an artificial head whose anatomically correct auditory canals are lined with condenser microphones.
	www.emercedesbenz.com /Feb06/21MercedesSLKAeroacousticsTesting.html (1229 words)

	Amazon.co.uk: aeroacoustics: Books (Site not responding. Last check: 2007-08-17)
		Aeroacoustics: Stol Noise : Airframe and Airfoil Noise Paas45 (Progress in astronautics and aeronautics) by Ira R. Schwartz, Henry T. Nagamatsu, and Warren C. Strahle (Hardcover - Jun 1976)
		Aeroacoustics, fan noise and control, duct acoustics, rotor noise : technical papers from AIAA 2nd Aero-acoustics Conference, March 1975, subsequently...
		Aeroacoustics, jet noise, combustion and core engine noise : technical papers from AIAA 2nd Aero-acoustics Conference, March 1975, subsequently revised...
	www.amazon.co.uk /s?ie=UTF8&keywords=aeroacoustics&tag=545-21&index=books&linkCode=ur2&page=1 (340 words)

	Fluent NEWS - Fall 2004 - Leading Edge Aeroacoustics Simulation
		While CAA is the most general and accurate theoretical approach for simulating aeroacoustics, it is unrealistic for most engineering problems because of a number of practical limitations, including widely varying length and time scales characteristic of the sound generation and transmission phenomena, and widely varying flow and acoustic pressures.
		The computational aeroacoustics approach is prohibitively expensive for most practical problems due to the large difference in time, length, and pressure scales involved in sound generation and transmission.
		Turbulence is the primary cause of sound in aeroacoustics, so in a broad sense, regions of the flow field where turbulence is strong produce louder sources of sound.
	www.fluent.com /about/news/newsletters/04v13i2/a22.htm (1304 words)

	International Journal of Aeroacoustics (Site not responding. Last check: 2007-08-17)
		Aeroacoustics is a growing area and has received fresh emphasis due to advances in air, ground and space transportation.
		Significant advances in aeroacoustics are required for reducing community and cabin noise from subsonic aircraft and to prepare for the possible large scale entry of supersonic aircraft into civil aviation.
		Fundamental topics include advances in understanding aeroacoustics phenomena; applied topics include all aspects of civil and military aircraft, automobile and high speed train aeroacoustics, and the impact of acoustics on structures.
	www.multi-science.co.uk /aeroacou.htm (523 words)

	Aeroacoustical Research: Aeroacoustics Curriculum
		The Ph.D. in Engineering Science with an emphasis in aeroacoustics requires as a minimum 66 semester hours of graduate credit beyond the baccalaureate degree.
		A preliminary examination is required at or near the beginning of the student's work beyond the master's degree and a comprehensive written examination must be passed before entering the dissertation process.
		Both options require as a minimum 30 semester hours of graduate credit (to include 6 hours of math-related courses) in which the student's adviser must approve all course selections.
	www.olemiss.edu /depts/ncpa/aeroacoustics/curric.html (215 words)

	Computational Aeroacoustics - Wikipedia, the free encyclopedia
		Computational Aeroacoustics (CAA) as defined by Allan D. Pierce (1992), is the direct simulation of acoustic fields generated by flows and of the interaction of acoustic fields with flows.
		With the rapid development in the field of computational resources and Aeroacoustics this field has undergone spectacular progress during the last decade.
		Compressible Navier-Stokes equations describes both the flow field and the aerodynamically generated acoustic field is solved directly.
	en.wikipedia.org /wiki/Computational_Aeroacoustics (615 words)

	The Official CEAS-ASC Web page
		In 1995 the Confederation of European Aerospace Societies (CEAS), governed by the CEAS Council, formed the Aeroacoustics Specialists' Committee to serve and support the scientific and industrial aeroacoustics community in Europe.
		Organize or contribute to the organization of the yearly AIAA/CEAS Aeroacoustics Conference.
		13th AIAA/CEAS Aeroacoustics Conference, 21-23 May 2007, in Rome, Italy, will be organized by CEAS-ASC with AIDAA and AIAA.
	www.win.tue.nl /ceas-asc (504 words)

	Department of Aerospace Engineering - CFD / Projects / AEROACOUSTICS (Site not responding. Last check: 2007-08-17)
		One of the major challenges in the computation of unsteady aerodynamic flows is the accurate prediction of the acoustic pressure.
		Although CFD is able to capture all noise sources, restrictions of the numerical schemes and turbulence modelling make aeroacoustics predictions difficult.
		Computational Fluid Dynamics is one of the major methods of studying aeroacoustics (others include experimental investigations and analytical studies) Several computations, undertaken using a variety of numerical techniques, turbulence models and flow cases have been used in oder to validate the vorticity confinement method in BVI problems.
	www.aero.gla.ac.uk /Research/CFD/projects/aeroacoustics/acoustics.htm (159 words)

	NREL: Wind Meetings - Attendee List
		Ahuja was trained in aeroacoustics in the Noise Research Department of Rolls Royce Ltd. UK and at the Institute of Sound and Vibration Research.
		He subsequently worked at Lockheed Georgia as the head of Aeroacoustics Research and is currently employed by Georgia Institute of Technology where he holds the ranks of the Professor of Aerospace Engineering and Regents Researcher and teaches courses in Aeroacoustics, Flow Control and Rocket Propulsion.
		His primary research topic is in the aerodynamics and aeroacoustics of helicopter main rotor blades, with particular emphasis on blade-vortex interaction noise generation and reduction.
	www.nrel.gov /wind_meetings/attendee_list.html (2718 words)

	Research Information
		It is the intention of the Aeroacoustics Research Consortium to promote mutually beneficial interaction between aeroacoustics researchers and Consortium sponsors, and to advance the state of the art in aeroacoustics research and technology.
		The focus of Consortium efforts and resources is on pre-competitive research and activities that are of benefit to Consortium members and ultimately the aeroacoustics community at large.
		The Aeroacoustics research Consortium is not intended to fund activities suitable for receiving support from other well-established sources; AARC funding should not be viewed as an alternative to National Science Foundation funding in the US or EPSRC funding in the UK, for example.
	www.oai.org /aeroacoustics/guidelines.html (604 words)

	Aerodynamic Noise, Sonic Boom and Aeroacoustics
		The increased use of fluid machines and engines has led to an increasing level of noise generation, and hence to an increasing interest in this area of research.
		Aeroacoustics deals with noise generated by aeronautic systems or their components.
		Aerodynamic noise is one of the main concerns in the design process of any new jet engine (or re-engineering of old ones).
	aerodyn.org /Acoustics/Sound/sound.html (933 words)

	Cascade Aeroacoustics Abstract
		A linearized unsteady aerodynamic analysis is applied to study the aeroacoustic properties of cascades.
		The analysis allows an assessment of the effects of real blade geometry and mean blade loading on the acoustic response of a cascade to external aerodynamic excitations.
		The acoustic responses to acoustic excitations at various incidence angles are also described and compared to analogous flat plate results, where qualitative differences are observed.
	home.comcast.net /~kousen/blade.abstr.html (113 words)

	Computational Fluid Dynamics and Aeroacoustics - ONERA / DSNA
		To develop numerical simulation methods and software in aerodynamics and energetics and manage all the aeroacoustic activities in order to meet the requirements for the prediction and optimization of aircraft performance.
		The applications cover combustion in engines and internal and external flows for all types of aircraft, fixed or rotating wing, low to hypersonic speeds, and space launchers.
		The purpose of the aeroacoustic studies is to reduce noise caused by the aerodynamics or the propulsion.
	www.onera.fr /dsna-en (115 words)

	Benchmark Problems Used to Assess Computational Aeroacoustics Codes
		The field of computational aeroacoustics (CAA) encompasses numerical techniques for calculating all aspects of sound generation and propagation in air directly from fundamental governing equations.
		Aeroacoustic problems typically involve flow-generated noise, with and without the presence of a solid surface, and the propagation of the sound to a receiver far away from the noise source.
		To assess the technological advancement of CAA, Glenn, in cooperation with the Ohio Aerospace Institute and the AeroAcoustics Research Consortium, organized and hosted the Fourth CAA Workshop on Benchmark Problems.
	www.grc.nasa.gov /WWW/RT/2004/RT/RTA-dahl.html (663 words)

	R. Parker --- Aeroacoustics (Site not responding. Last check: 2007-08-17)
		The results showed that the acoustic and mechanical systems cannot be considered separately but must be treated as parts of one system if the response either to mechanical excitation or to vortex shedding is to be predicted for cases where the resonance frequencies of the two systems are close to each other.
		The acoustic resonance can act as a vibration absorber when excitation is mechanical but, more importantly in relation to aeroacoustics, the relative motion of the vortex shedding body and the surrounding fluid controls the correlation of the vortex shedding and therefore the oscillatory energy input to the resonance.
		The maximum relative velocities occur when the acoustic velocities and the vibration velocities of the shedding body are out of phase.
	www.mae.cornell.edu /IJFD/1997_vol1/paper1/Parker.Mechanical.html (287 words)

	Press Room - Aeroacoustics DESTINY-AAC industrial project
		These are the provision of robust LES-type turbulence and advanced near-wall modeling, and their validation against a wide variety of aeroacoustics examples, which are currently a high priority in the transport sector.
		Complementary to the provision of advanced turbulence modeling, noise propagation to the near and far field is realized through coupling to new aeroacoustics features in LMS International’s software SYSNOISE, which imports STAR-CD transient data and compiles equivalent sources.
		Preliminary results have confirmed expectations that the advanced models are robust, efficient and strongly suited to aeroacoustics.
	www.cd-adapco.com /press_room/dynamics/19/destiny.html (489 words)

	Aeroacoustics of Flight Vehicles, Volume 1: Noise Sources; Volume 2:
		In July 1982, the Continuing Education Subcommittee of the Institute of Aeronautics and Astronautics (AIAA) Aeroacoustics Technical Committee identified a critical need for a reference book summarizing and interpreting the status of research in aeroacoustics.
		The book would have a scope consistent with that of the Technical Committee and would include physics of noise produced by motion of fluids and bodies through the atmosphere and by chemical reaction processes; it would also include the responses of human beings, structures, and the atmosphere to aerodynamic noise.
		Elaine Moran of the Acoustical Society of America and Andrew Prince of the American Institute of Physics have coordinated the preparation of materials for this reprinting.
	asa.aip.org /books/aeroacoustics.html (1409 words)

	R. Parker --- Abstract (Site not responding. Last check: 2007-08-17)
		The article presents an overall view of engineering situations in which sound can be generated by processes associated with fluid flow.
		The review is not exhaustive but represents the author's experience of phenomena which, in the last two to three decades, have come to be known a "Aeroacoustics".
		The topics are not widely understood by engineers and are often ignored by designers in spite of the fact that they can be sources of serious environmental noise problems and, when the acoustic pressures cause vibration, fatigue failure in machinery.
	elecpress.monash.edu.au /ijfd/1997_vol1/paper1/Parker.Abstract.html (103 words)

	Workshop on Computational Aeroacoustics (Site not responding. Last check: 2007-08-17)
		ICASE/LaRC WORKSHOP ON BENCHMARK PROBLEMS IN COMPUTATIONAL AEROACOUSTICS October 24-26, 1994 Holiday Inn Hampton - Coliseum Hotel and Conference Center Hampton, Virginia Computational aeroacoustics (CAA), although at present in its infancy, is fast emerging to occupy a position equal in importance to theory and experiment.
		The purpose of the Workshop on the Benchmark Problems in Computational Aeroacoustics is to evaluate the accuracy and efficiency of numerical methods in a systematic fashion as applied to certain elementary testbed problems which characterize the difficulties of CAA.
		This Workshop is a sequel to the first Workshop on Computational Aeroacoustics held in April 1992, which focused on assessing the state-of-the-art and defining future directions of research [Springer-Verlag 1993].
	www.csc.fi /math_topics/Mail/NANET94/msg00616.html (260 words)

	ADVANCES IN AEROACOUSTICS AND APPLICATIONS
		The aim of this Lecture Series is to present a state-of-the-art review of on-going activities in noise prediction and to indicate current research directions.
		Introductory lectures on the fundamentals of aeroacoustics will be followed by up-to-date reviews of experimental techniques and numerical modeling.
		Acoustic engineering and industrial applications, such as noise from rotating machines, combustion instabilities, ventilation, jet noise and wind noise around buildings, will also be presented to the attendees to enhance the applicability to their various fields of research.
	www.allconferences.com /conferences/20030917040202 (98 words)

	Nonlinear Aeroacoustics Computations by the Space-Time CE/SE Method
		The method is robust enough to cover a wide range of compressible flows: from weak linear acoustic waves to strong discontinuous waves (shocks).
		In nature, the method may be categorized as a finite volume method, where the conservation element (CE) is equivalent to a finite control volume (or cell) and the solution element (SE) can be understood as the cell interface.
		Then applications of the 2-D and 3-D CE/SE schemes to linear, and in particular, nonlinear aeroacoustics are depicted in sections 3, 4, and 5 to demonstrate its robustness and capability.
	gltrs.grc.nasa.gov /cgi-bin/GLTRS/browse.pl?2003/CR-2003-212388.html (353 words)

	AeroAcoustics Aircraft Systems Home
		AeroAcoustics Aircraft Systems, Inc. provides performance improvement products for Cessna Caravan aircraft. Our products are designed to enhance the payload capability of the Caravan hence the name Aircraft Payload Extender or APE for short. Among the products we offer are kits that increase the maximum takeoff weight and maximum landing weight.
		APE kits are installed on over 350 Caravans throughout the world. APE equipped Caravans have been in continuous operation since the creation of the company in 1994.
		All APE products are approved by FAA Supplemental Type Certificates (STC) and are manufactured under our FAA Parts Manufacturing Authority (PMA). APE systems are sold as a kit and carefully engineered to ensure easy installation on the aircraft.
	www.aeroacoustics.com (137 words)

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