Microphone Array Measurements: Sound Source Localization by means of SODIX
|
|
- Sybil Payne
- 6 years ago
- Views:
Transcription
1 Microphone Array Measurements: Sound Source Localization by means of SODIX Stefan Funke, Henri Siller, Lars Enghardt Engine Acoustics, Institute of Propulsion Technology German Aerospace Center
2 Outline The German Aerospace Center (DLR) Institute of Propulsion Technology Engine acoustics Motivation Outdoor tests of aero-engines Indoor tests of aero-engines Sound source localization SODIX Methodology Validation and application Results Summary
3 DLR German Aerospace Center Research Institution Space Agency Project Management Agency
4 DLR: Sites and employees ~8.000 employees working in 33 research institutes and facilities at 16 Sites. Offices in Brussels, Paris and Washington. Sites of the Institute of Propulsion Technology Engine Acoustics - Berlin Stade Hamburg Bremen- Trauen Neustrelitz Berlin- Braunschweig Göttingen Jülich Köln Bonn Lampoldshausen Stuttgart Augsburg Oberpfaffenhofen Weilheim
5 Organisation of the Institute Institute of Propulsion Technology Reinhard Mönig Engine Andreas Döpelheuer Fan and Compressor Eberhard Nicke Combustor Christoph Hassa Turbine Frank Kocian Engine Acoustics Lars Enghardt Engine Measurement Systems Christian Willert Numerical Methods Edmund Kügeler Combustion simulation Francesca di Mare Combustion Test Christian Fleing
6 DLR.de Folie 6 Engine Acoustics - Core Competencies Turbomachinery sound sources Engine core sound sources Jet Noise Unsteady aerodynamics of turbomachinery Sound propagation in ducts Radiation of sound Sound source localisation Sound absorption / Liner Active flow/noise control Acoustic predesign Experimental facilities Methods & Tools
7 DLR.de Folie 7 Engine Acoustics - Core Competencies Turbomachinery sound sources Engine core sound sources Jet Noise Unsteady aerodynamics of turbomachinery Sound propagation in ducts Radiation of sound Sound source localisation Sound absorption / Liner Active flow/noise control Acoustic predesign Experimental facilities Methods & Tools
8 Motivation Picture: Rolls-Royce plc Development of analysis method finding an optimum model distribution of sources fitting measured array data Transfer of the analysis method to in-door measurements
9 State-of-the-art of source localization Establishment of cross-spectral matrix in the frequency domain Conventional beamforming Source: Blacodon und Élias (2004) Sound source deconvolution methods (DAMAS, CLEAN-SC) Inverse methods, MM > JJ No method available for accurate analysis of directed radiation from aircraft engine sound sources
10 State-of-the-art of source localization (cont d) Parametric optimization in literature - AFINDS - complex modelling of aircraft engine sources with low parameter count - SEM - distributed arrangement of monopoles as equivalent sources Conventional beamforming SEM Source: Blacodon und Élias (2004) Extension of SEM method taking into account the directivity of the sound sources
11 Methodology of SODIX SOurce DIrectivity Modeling in the Cross-Spectral MatriX Extension of SEM by modelling a free choice of source directivity SEM SODIX Determination of sound source strengths DD by means of iterative minimization of the cost function FF(DD) using a conjugative gradient method Consideration of side condition for positive source strengths by transformation DD = dd 22
12 Methodology of SODIX (cont d) - Startdistribution: energy-equivalent, constant source strengths - Plot of the equivalent source amplitudes as function of position and direction start ii solution ii ii = ii = 50 52
13 Measurement of the same engine freefield and indoor engine far-field microphones microphone array Picture: Wolfram Hage
14 Measurement of the same engine freefield and indoor Rolls-Royce BR700 Picture: Rolls-Royce Deutschland
15 Validation of SODIX with farfield measurements The SODIX-Sourcemap depicts the directed source strengths of the axially distributed monopole sources Integration over areas of the linear source grid enables the discrimination of source regions inlet, nozzle and jet Extrapolation of the source strengths to the farfield positions with 1/rr The mean deviation between SODIX derived results and farfield measurements is in the order of 0.5 db
16 SODIX applied to the indoor configuration microphones
17 Determination of the sound power from the nozzle Low engine thrust - Integration over angular range from 85 to Small deviations up to 2.5 db at low engine thrust for frequencies above 200 Hz High engine thrust - Reproduction of spectral characteristics - Even better agreement for high engine thrust
18 Other aplications of SODIX QinetiQ NTF DLR AWB
19 DLR.de Chart 19 Summary SODIX is a universal source localisation method for microphone array data High spatial resolution (comparable to available deconvolution methods) High dynamic range (> 20dB, comparable to best deconvolution methods) Gives directly the highly resolved directivity of the sources Very robust No pre-calibration needed, no further assumptions Validated against beamforming and deconvolution methods SODIX allows for the comparison of in-door and free-field aero-engine acoustic measurement Targeted is the acoustic quantification of engine design changes by means of in-door engine tests
Aeronautics Space Space Agency Transport Energy. Hot-wire measurements of a Counter Rotating Turbo Fan (CRTF) Robert Meyer, Lars Enghardt
CAV-Workshop 010 DLR German Aerospace Research Center Aeronautics Space Space Agency Transport Energy Hot-wire measurements of a Counter Rotating Turbo Fan (CRTF) Robert Meyer, Lars Enghardt Institute
More informationInstitute of Optical Sensor Systems German Aerospace Center
DLR.de Chart 1 Institute of Optical Sensor Systems German Aerospace Center Dr. Anko Börner Institute of Optical Sensor Systems 15th February 2017 DLR.de Chart 2 DLR Deutsches Zentrum für Luft- und Raumfahrt
More informationImprovements of a parametric model for fan broadband and tonal noise
Improvements of a parametric model for fan broadband and tonal noise A. Moreau and L. Enghardt DLR - German Aerospace Center, Mueller-Breslau-Str. 8, 10623 Berlin, Germany antoine.moreau@dlr.de 4083 Engine
More informationGerman Remote Sensing Data Center (DFD) of DLR Department on Environment and Security. Training Course. Introduction to Geospatial Data Analysis
Training Course Introduction to Geospatial Data Analysis 11-15 February 2008, NAM Center, Jakarta German Aerospace Center - DLR Information about the German Aerospace Center (DLR) DLR is Germany s national
More informationTerraSAR-X and TanDEM-X Applications for Maritime Domain Awereness
TerraSAR-X and TanDEM-X Applications for Maritime Domain Awereness Dr. Stephan Brusch German Aerospace Center DLR Remote Sensing Technology Institute DLR Oberpfaffenhofen (Germany) Dr. Jürgen Drescher
More informationQuantitative source spectra from acoustic array measurements
BeBeC-2008-03 Quantitative source spectra from acoustic array measurements Ennes Brandenburgische Technische Universita t Cottbus, Institut fu r Verkehrstechnik, Siemens-Halske-Ring 14, 03046 Cottbus,
More informationInfrared. Beyond the rainbow.
www.dlr.de/dlrschoollab Infrared Beyond the rainbow William Herschel was confused. The German-born British musician, mathematician, astronomer and engineer had just carried out an experiment in which he
More informationW-8 Inlet In-duct Array Evaluation
https://ntrs.nasa.gov/search.jsp?r=2184548 218-9-16T15:19:18+:Z National Aeronautics and Space Administration W-8 Inlet In-duct Array Evaluation Rick Bozak NASA Glenn Research Center Acoustics Technical
More informationMeasurement of the acoustic particle velocity under grazing flow using A-PIV
Measurement of the acoustic particle velocity under grazing flow using A-PIV Anita Schulz 1,*, André Fischer 2, Friedrich Bake 3 1: Institute of Fluid Mechanics, Technische Universität Berlin, Berlin,
More informationCLEAN Based on Spatial Source Coherence
CLEN Based on Spatial Source Coherence Pieter Sijtsma Nationaal Lucht- en Ruimtevaartlaboratorium National erospace Laboratory NLR coustic array measurements in closed wind tunnel test section irbus 340
More informationADVANCES IN MICROPHONE ARRAY MEASUREMENTS IN A CRYOGENIC WIND TUNNEL
ADVANCES IN MICROPHONE ARRAY MEASUREMENTS IN A CRYOGENIC WIND TUNNEL Thomas Ahlefeldt, Lars Koop, Andreas Lauterbach, Carsten Spehr Institute of Aerodynamics and Flow Technology, German Aerospace Center
More informationAcoustic Environment of the VEGA Launch Vehicle at Lift-Off
Acoustic Environment of the VEGA Launch Vehicle at Lift-Off Denis Gély, Georges Elias ONERA, 22 Avenue de la Division Leclerc 92322 CHATILLON, France, {denis.gely, georges.elias}@onera.fr Flavia Mascanzoni
More informationPerformance improvement of propulsion systems by optimization of the mixing efficiency and pressure loss of forced mixers
Paper presented at the 8. European Propulsion Forum Affordability and the Environment Key Challenges for Propulsion in the 2 st Century 26.-28. March 200 in Nottingham Abstract Performance improvement
More informationFREQUENCY-DOMAIN RECONSTRUCTION OF THE POINT-SPREAD FUNCTION FOR MOVING SOURCES
FREQUENCY-DOMAIN RECONSTRUCTION OF THE POINT-SPREAD FUNCTION FOR MOVING SOURCES Sébastien Guérin and Christian Weckmüller DLR, German Aerospace Center Institute of Propulsion Technology, Engine Acoustics
More informationInvestigation of the Effect of Inflow Distortion on the Noise Emitted from an Axial Flow Fan Experiencing Cross Flow
Investigation of the Effect of Inflow Distortion on the Noise Emitted from an Axial Flow Fan Experiencing Cross Flow J. Tirakala, H.-J. Kaltenbach Lehrstuhl für Aerodynamik und Strömungsmechanik Overview
More informationFree Field Technologies
Free Field Technologies SFA Conference Toulouse the 25 th of November 2010 Copyright Free Field Technologies Free Field Technologies Free Field Technologies is a technical leader in the field of acoustic,
More informationExperimental feasibility of in-duct sound source reconstruction
Acoustics 8 Paris Experimental feasibility of in-duct sound source reconstruction T. Bravo and C. Maury Université de Technologie de Compiègne Centre de Recherche Royallieu BP2529 625 Compiègne France
More informationTurbomachinery Aeroacoustics
Turbomachinery Aeroacoustics Mats Åbom KTH-The Royal Inst of Technology The Marcus Wallenberg Laboratory for Sound and Vibration Research (MWL) SE-100 44 Stockholm, Sweden matsabom@kth.se orcid.org/0000
More informationA New Modular Fan Rig Noise Test and Radial Mode Detection Capability
17th AIAA/CEAS Aeroacoustics Conference(32nd AIAA Aeroacoustics Conference) 05-08 June 2011, Portland, Oregon AIAA 2011-2897 A New Modular Fan Rig Noise Test and Radial Mode Detection Capability Ulf Tapken,
More informationAeroacoustic Evaluation of an Axial Fan using CFD Methods Frederik Folke, Martin Hildenbrand (ITB Ingenieure GmbH)
Aeroacoustic Evaluation of an Axial Fan using CFD Methods Frederik Folke, Martin Hildenbrand (ITB Ingenieure GmbH) ITB_SGC_AeroacousticEvaluationOfAnAxialFanUsingCFDMethods_160803.pptx ITB GmbH, Folke,
More informationAn Observer for Phased Microphone Array Signal Processing with Nonlinear Output
2010 Asia-Pacific International Symposium on Aerospace Technology An Observer for Phased Microphone Array Signal Processing with Nonlinear Output Bai Long 1,*, Huang Xun 2 1 Department of Mechanics and
More informationPhased Array Technology Applied to Aeroacoustics
Phased Array Technology Applied to Aeroacoustics 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) 13 May 2009 Miami, Florida Bob Dougherty President, OptiNav, Inc. Outline Problems
More informationLANDING GEARS AERODYNAMIC INTERACTION NOISE
European Congress on Computational Methods in Applied Sciences and Engineering ECCOMAS 2004 P. Neittaanmäki, T. Rossi, S. Korotov, E. Oñate, J. Périaux, and D. Knörzer (eds.) Jyväskylä, 24 28 July 2004
More informationMICROPHONE ARRAY METHOD FOR THE CHARACTERIZATION OF ROTATING SOUND SOURCES IN AXIAL FANS
MICROPHONE ARRAY METHOD FOR THE CHARACTERIZATION OF ROTATING SOUND SOURCES IN AXIAL FANS Gert HEROLD, Ennes SARRADJ Brandenburg University of Technology, Chair of Technical Acoustics, Siemens-Halske-Ring
More informationOptimization of Trailing-Edge Serrations to Reduce Open-Rotor Tonal Interaction Noise
Optimization of Trailing-Edge Serrations to Reduce Open-Rotor Tonal Interaction Noise Robert Jaron, Institute of Propulsion Technology, German Aerospace Center (DLR), Müller-Breslau-Str. 8, 10623 Berlin,
More informationinter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering August 2000, Nice, FRANCE
1 inter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering 27-30 August 2000, Nice, FRANCE I-INCE Classification: 1.0 PREDICTION OF LOW FREQUENCY SOUND GENERATION FROM
More informationSOUND SOURCE LOCALIZATION VIA ELASTIC NET REGULARIZATION
BeBeC-2014-02 SOUND SOURCE LOCALIZATION VIA ELASTIC NET REGULARIZATION Xiaodong Li, Weiming Tong and Min Jiang School of Energy and Power engineering, Beihang University 100191, Beijing, China ABSTRACT
More informationSound power qualification of a turbocharger in enclosed environment using an innovating acoustic imaging processing: Generalized Acoustic Holography
Sound power qualification of a turbocharger in enclosed environment using an innovating acoustic imaging processing: Generalized Acoustic Holography A. Sébastien PAILLASSEUR 1, B. Thibaut LE MAGUERESSE
More informationContents. Preface... xvii
Contents Preface... xvii CHAPTER 1 Idealized Flow Machines...1 1.1 Conservation Equations... 1 1.1.1 Conservation of mass... 2 1.1.2 Conservation of momentum... 3 1.1.3 Conservation of energy... 3 1.2
More informationMultiple pure tone (MPT) noise, also referred to as buzzsaw noise, is characterized as multiple tones at
13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference) AIAA 2007-3523 Multiple Pure Tone Noise Prediction and Comparison with Static Engine Test Measurements Fei Han, Chingwei M.
More informationANALYSIS OF TURBOFAN ENGINE DESIGN MODIFICATION TO ADD INTER-TURBINE COMBUSTOR
Journal of KONES Powertrain and Transport, Vol. 22, No. 3 2015 ANALYSIS OF TURBOFAN ENGINE DESIGN MODIFICATION TO ADD INTER-TURBINE COMBUSTOR Robert Jakubowski Rzeszow University of Technology Department
More informationINFLUENCE OF OPERATIONAL GEOMETRY CHANGES ON TURBINE ACOUSTICS
Paper ID: ETC2017-037 Proceedings of 12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics ETC12, April 3-7, 2017; Stockholm, Sweden INFLUENCE OF OPERATIONAL GEOMETRY CHANGES ON TURBINE
More informationMeasurement and Scaling of Trailing-Edge Noise * *rather an extensive look at the scaling of the related source quantities Michaela Herr
Measurement and Scaling of Trailing-Edge Noise * *rather an extensive look at the scaling of the related source quantities Michaela Herr Institute of Aerodynamics and Flow Technology DLR Braunschweig 13
More informationPASSIVE NOISE CONTROL OF A BURNER-COMBUSTOR SYSTEM OF A TURBO-FAN ENGINE
ICSV14 Cairns Australia 9-1 July, 007 PASSIVE NOISE CONTROL OF A BURNER-COMBUSTOR SYSTEM OF A TURBO-FAN ENGINE Ayman El-Badawy 1 and Wael EL-ARNA'OUTY 1 Department of Engineering Mechanics, The German
More informationHybrid CFD/FEM calculations for the aeroacoustic noise radiated from a radial fan
Hybrid CFD/FEM calculations for the aeroacoustic noise radiated from a radial fan Hakan Dogan Department of Mathematics, Physics and Chemistry, Beuth University of Applied Sciences, Berlin, Chris Eisenmenger
More informationThe Acoustic Measurement Capabilities in the Acoustic Linear Research Laboratory at University of Cincinnati
The Acoustic Measurement Capabilities in the Acoustic Linear Research Laboratory at University of Cincinnati Asif Syed Research Professor, School of Aerospace Systems College of Engineering and Applied
More informationNUMERICAL SIMULATION OF ACOUSTIC LINERS IN NACELLE TURBOFANS TOWARDS AIRCRAFT NOISE REDUCTION
Proceedings of 11 th European Conference on Turbomachinery Fluid dynamics & Thermodynamics ETC11, March 23-27, 2015, Madrid, Spain NUMERICAL SIMULATION OF ACOUSTIC LINERS IN NACELLE TURBOFANS TOWARDS AIRCRAFT
More informationAcoustic and entropy waves in nozzles in combustion noise framework
Acoustic and entropy waves in nozzles in combustion noise framework Mahmoudi, Y., Dowling, A. P., & Stow, S. R. (217). Acoustic and entropy waves in nozzles in combustion noise framework. AIAA Journal.
More informationPulse detonatio. Zheng Long Xi 1,Li Na 2 and Yan Chuan Jun 3 Northwestern Polytechnical University, xi'an, Shaanxi, , P.R.China.
47th AIAA Aerospace Sciences Meeting Including The New Horizons Forum and Aerospace Exposition - 8 January 9, Orlando, Florida AIAA 9-97 Investigation on Noise Radiation Characteristics of Two- Phase Multi-Cycle
More informationLaboratory synthesis of turbulent boundary layer wall-pressures and the induced vibro-acoustic response
Proceedings of the Acoustics 22 Nantes Conference 23-27 April 22, Nantes, France Laboratory synthesis of turbulent boundary layer wall-pressures and the induced vibro-acoustic response C. Maury a and T.
More informationIndustries & Applications
Industries & Applications Aerospace High Lift Devices Landing Gear ECS Jet and turbo noise Marine Propeller noise Cavitation Hull/propeller/rudder interaction Automotive Wing mirror Sunroof noise HVAC
More informationComparison of direct and indirect combustion noise mechanisms in a model combustor
Comparison of direct and indirect combustion noise mechanisms in a model combustor M. Leyko SNECMA, 77550 Moissy-Cramayel, France - CERFACS, 3057 Toulouse, France F. Nicoud Université Montpellier II, 34095
More informationCross-spectral Matrix Diagonal Reconstruction
Cross-spectral Matrix Diagonal Reconstruction Jørgen HALD 1 1 Brüel & Kjær SVM A/S, Denmark ABSTRACT In some cases, measured cross-spectral matrices (CSM s) from a microphone array will be contaminated
More informationSjoerd Rienstra: Mathematician in Aeroacoustics Legacy at NLR
Sjoerd Rienstra: Mathematician in Aeroacoustics Legacy at NLR Harry Brouwer Sjoerd and NLR (NLR = Nederlands Lucht- en Ruimtevaartcentrum Netherlands Aerospace Centre) Worked at NLR from 1979 to 1986 Short
More informationINVESTIGATIONS ON NOISE SOURCES ON A CONTRA-ROTATING AXIAL FAN WITH DIFFERENT MODIFICATIONS
INVESTIGATIONS ON NOISE SOURCES ON A CONTRA-ROTATING AXIAL FAN WITH DIFFERENT MODIFICATIONS Ralph KRAUSE 1, Christian FRIEBE 1, Michael KERSCHER 2, Christof PUHLE 3 1 INSTITUT FÜR LUFT- UND KÄLTETECHNIK
More informationNUMERICAL PREDICTION OF PERFORATED TUBE ACOUSTIC IMPEDANCE
NUMERICAL PREDICTION OF PERFORATED TUBE ACOUSTIC IMPEDANCE G. Pradeep, T. Thanigaivel Raja, D.Veerababu and B. Venkatesham Department of Mechanical and Aerospace Engineering, Indian Institute of Technology
More informationOn Physical Aeroacoustics with Some Implications for Low-Noise Aircraft Design and Airport Operations
Aerospace 2015, 2, 17-90; doi:10.3390/aerospace2010017 Review OPEN ACCESS aerospace ISSN 2226-4310 www.mdpi.com/journal/aerospace On Physical Aeroacoustics with Some Implications for Low-Noise Aircraft
More informationNumerical Study of Pressure Waves Generated by H-IIA Launch Vehicle at Lift-off
Numerical Study of Pressure Waves Generated by H-IIA Launch Vehicle at Lift-off Seiji Tsutsumi, Taro Shimizu, Ryoji Takaki, Eiji Shima, and Kozo Fujii Japan Aerospace Exploration Agency 3-1-1 Yoshinodai,
More informationABSTRACT HIGH QUALITY ACOUSTIC TIME HISTORY MEASUREMENTS OF ROTOR HARMONIC NOISE IN CONFINED SPACES
ABSTRACT Title of Thesis: HIGH QUALITY ACOUSTIC TIME HISTORY MEASUREMENTS OF ROTOR HARMONIC NOISE IN CONFINED SPACES Christopher Sutton, Master of Science, 2016 Directed By: Professor Fredric H. Schmitz
More informationWHITE PAPER. Challenges in Sound Measurements Field Testing JUNE 2017
WHITE PAPER Challenges in Sound Measurements Field Testing JUNE 2017 1 Table of Contents Introduction 3 Sound propagation, simplified approach 3 Sound propagation at ideal conditions 5 Sound propagation
More informationAEROSPACE APPLICATIONS OF CONTROL
AEROSPACE APPLICATIONS OF CONTROL CDS 0 Seminar October 8, 00 Scott A. Bortoff Group Leader, Controls Technology United Technologies Research Center International Fuel Cell Carrier Pratt & Whitney Sikorsky
More informationFundamentals of silencing and their practical application in screw compressor plants
Fundamentals of silencing and their practical application in screw compressor plants Dr.-Ing. Johann Lenz Theory of sound Air or fluid-borne sound is generally considered as weak pressure fluctuations.
More informationJet Aircraft Propulsion Prof. Bhaskar Roy Prof A M Pradeep Department of Aerospace Engineering Indian Institute of Technology, Bombay
Jet Aircraft Propulsion Prof. Bhaskar Roy Prof A M Pradeep Department of Aerospace Engineering Indian Institute of Technology, Bombay Module No. #01 Lecture No. # 07 Jet Engine Cycles For Aircraft propulsion
More informationGlobal Attenuation of Acoustic Fields Using Energy-Based Active Control Techniques
Global Attenuation of Acoustic Fields Using Energy-Based Active Control Techniques Scott D. Sommerfeldt Acoustics Research Group Brigham Young University ovember 17, 009 1 Acknowledgments Kent Gee BYU
More informationAdvanced Engine Noise Control Based on Plasma Actuators. Franck Cléro, Onera Victor Kopiev, TsAGI
Advanced Engine Noise Control Based on Plasma Actuators Franck Cléro, Onera Victor Kopiev, TsAGI Fan Soufflante Compresseur Compressor Combustion Combustinr Jet Turbine Turbine Aerodynamique Airframe noise
More informationCOMPUTATIONAL INVESTIGATION OF AERODYNAMIC AND ACOUSTIC CHARACTERISTICS OF COUNTER ROTATING FAN WITH ULTRA HIGH BYPASS RATIO
Paper ID: ETC2017-146 Proceedings of 12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics ETC12, April 3-7, 2017; Stockholm, Sweden COMPUTATIONAL INVESTIGATION OF AERODYNAMIC AND
More informationA SIMPLE ACOUSTIC MODEL TO SIMULATE THE BLADE-PASSING FREQUENCY SOUND PRESSURE GENERATED IN THE VOLUTE OF CENTRIFUGAL PUMPS
A SIMPLE ACOUSTIC MODEL TO SIMULATE THE BLADE-PASSING FREQUENCY SOUND PRESSURE GENERATED IN THE VOLUTE OF CENTRIFUGAL PUMPS PACS REFERENCE: 43.28.Ra Parrondo Gayo, Jorge; Pérez Castillo, Javier; Fernández
More informationME 6139: High Speed Aerodynamics
Dr. A.B.M. Toufique Hasan Professor Department of Mechanical Engineering, BUET Lecture-01 04 November 2017 teacher.buet.ac.bd/toufiquehasan/ toufiquehasan@me.buet.ac.bd 1 Aerodynamics is the study of dynamics
More informationResonance Frequencies and Damping in Combustion Chambers with Quarter Wave Cavities
6th Symposium on Launcher Technologies, November th toth,, Munich Resonance Frequencies and Damping in Combustion Chambers with Quarter Wave Cavities Zoltán FARAGÓ Michael OSCHWALD Institute of Space Propulsion,
More informationAeroacoustic Computation of Ducted-Fan Broadband Noise Using LES Data
Aeroacoustic Computation of Ducted-Fan Broadband Noise Using LES Data G. Reboul, C. Polacsek, S. Lewy and S. Heib ONERA, 29 avenue Division Leclerc, 92320 Châtillon, France gabriel.reboul@onera.fr 77 Following
More informationFan Noise Control by Enclosure Modification
Fan Noise Control by Enclosure Modification Moohyung Lee a, J. Stuart Bolton b, Taewook Yoo c, Hiroto Ido d, Kenichi Seki e a,b,c Ray W. Herrick Laboratories, Purdue University 14 South Intramural Drive,
More informationDynamic Modeling and Simulation on GE90 Engine
The International Journal Of Engineering And Science (IJES) Volume 5 Issue 12 Pages PP 111-119 2016 ISSN (e): 2319 1813 ISSN (p): 2319 1805 Dynamic Modeling and Simulation on GE90 Engine Shray Benawra
More informationArtificial comets. Snowballs with tails. From heralds of evil to objects of research.
www.dlr.de/dlrschoollab Artificial comets Snowballs with tails When they had heard the king, they departed; and, lo, the star, which they saw in the east, went before them, till it came and stood over
More informationAcoustic PIV: Measurements of the acoustic particle velocity using synchronized PIV-technique. André Fischer, Emilie Sauvage, Ingo Röhle
Acoustic PIV: Measurements of the acoustic particle velocity using synchronized PIV-technique André Fischer, Emilie Sauvage, Ingo Röhle Department of Engine Acoustics, Institute of Propulsion Technology
More informationAEROACOUSTIC INVESTIGATION OF THE EFFECT OF A DETACHED FLAT PLATE ON THE NOISE FROM A SQUARE CYLINDER
Abstract AEROACOUSTIC INVESTIGATION OF THE EFFECT OF A DETACHED FLAT PLATE ON THE NOISE FROM A SQUARE CYLINDER Aniket D. Jagtap 1, Ric Porteous 1, Akhilesh Mimani 1 and Con Doolan 2 1 School of Mechanical
More informationBeamforming of aeroacoustic sources in the time domain
Beamforming of aeroacoustic sources in the time domain Jeoffrey FISCHER 1 ; Vincent VALEAU 1 ; Laurent-Emmanuel BRIZZI 1 1 Institut PPRIME UPR 3346 CNRS - Université de Poitiers - ENSMA 86022 Poitiers
More informationGas Dynamics and Propulsion Dr. Babu Viswanathan Department of Mechanical Engineering Indian Institute of Technology - Madras. Lecture 01 Introduction
Gas Dynamics and Propulsion Dr. Babu Viswanathan Department of Mechanical Engineering Indian Institute of Technology - Madras Lecture 01 Introduction Good morning. I will start our lecture today with brief
More informationCorrelations between density fluctuations and acoustic far field in free jets using Rayleigh scattering
53 rd 3AF International Conference on Applied Aerodynamics 26 28 March 218, Salon de Provence France FP7-AERO218-mercier Correlations between density fluctuations and acoustic far field in free jets using
More informationFast and Broadbanded Car Interior Panel Noise Contribution Analysis
1 Fast and Broadbanded Car Interior Panel Noise Contribution Analysis Dr. Oliver Wolff, Open Technology Forum at Testing Expo Europe 2008, Stuttgart, 6 th 8 th May 2008 2 Contents Contents of presentation:
More informationLarge Eddy Simulation of Three-Stream Jets
Large Eddy Simulation of Three-Stream Jets J. Xiong 1, F. Liu 2, and D. Papamoschou 3 University of California, Irvine, Irvine, CA, 92697 We present a computational study of three-stream jets simulating
More informationSound radiation from the open end of pipes and ducts in the presence of mean flow
Sound radiation from the open end of pipes and ducts in the presence of mean flow Ray Kirby (1), Wenbo Duan (2) (1) Centre for Audio, Acoustics and Vibration, University of Technology Sydney, Sydney, Australia
More informationExperimental determination of far field sound power due to panel and vent radiation of a portable diesel generator
Reno, Nevada NOISE-CON 2007 2007 October 22-24 Experimental determination of far field sound power due to panel and vent radiation of a portable diesel generator Jason Sagers a Jonathan Blotter b Scott
More informationStudy on Acoustically Transparent Test Section of Aeroacoustic Wind Tunnel
Journal of Applied Mathematics and Physics, 2018, 6, 1-10 http://www.scirp.org/journal/jamp ISSN Online: 2327-4379 ISSN Print: 2327-4352 Study on Acoustically Transparent Test Section of Aeroacoustic Wind
More informationEngineering Noise Control
Engineering Noise Control Theory and practice Second edition David A. Bies and Colin H. Hansen Department of Mechanical Engineering University of Adelaide South Australia E & FN SPON An Imprint of Chapman
More informationToshinori Watanabe Department of Aeronautics and Astronautics The University of Tokyo Tokyo, Japan
Review: Active Control of Shock-associated Unsteady Flow Phenomena in Aeroengines - Suppression Techniques for Transonic Cascade Flutter and Supersonic Jet Noise - Toshinori Watanabe Department of Aeronautics
More informationPrediction of environmental sound pressure levels due to large wind turbines
Wind Farm Noise: Paper ICA2016-168 Prediction of environmental sound pressure levels due to large wind turbines Matteo Deambrosi Papini (a), Matías Hernández Castellani (b), Alice Elizabeth González (c),
More informationJournal of Sound and Vibration
Journal of Sound and Vibration 329 (2010) 4810 4828 Contents lists available at ScienceDirect Journal of Sound and Vibration journal homepage: www.elsevier.com/locate/jsvi Aeroacoustics research in Europe:
More informationContents. 1 Introduction to Gas-Turbine Engines Overview of Turbomachinery Nomenclature...9
Preface page xv 1 Introduction to Gas-Turbine Engines...1 Definition 1 Advantages of Gas-Turbine Engines 1 Applications of Gas-Turbine Engines 3 The Gas Generator 3 Air Intake and Inlet Flow Passage 3
More informationFlap noise measurements in a closed wind tunnel with a phased array
Flap noise measurements in a closed wind tunnel with a phased array H.M.M. van der Wal and P. Sijtsma Nationaal Lucht- en Ruimtevaartlaboratorium National Aerospace Laboratory NLR Flap noise measurements
More informationAssessment of noise prediction models for long-range sound propagation of wind turbines over water
Assessment of noise prediction models for long-range sound propagation of wind turbines over water Lukas Mylonas, Bahri Uzunoglu lukas.mylonas@gmail.com, bahri.uzunoglu@angstrom.uu.se Uppsala University
More informationGerman Contributions to Earth Observation from Space WMO ET-SAT #11
German Contributions to Earth Observation from Space Update @ WMO ET-SAT #11 Albrecht von Bargen DLR Space Administration Earth Observation Geneve (CH), April 4-6, 2017 DLR the German Aerospace Center
More informationDETECTION AND ANALYSIS OF AZIMUTHAL MODES IN A CENTRIFUGAL IMPELLER
The 12th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery Honolulu, Hawaii, February 17-22, 28 ISROMAC12-28-259 DETECTION AND ANALYSIS OF AZIMUTHAL MODES IN A CENTRIFUGAL
More informationAcoustic Scattering through a Circular Orifice in Low Mach-Number Flow
Acoustic Scattering through a Circular Orifice in Low Mach-Number Flow Stefan Sack, Mats Åbom KTH, KTH, the Royal Institute of Technology Research Areas Aero-acoustics Vibration isolators Wave-based methods
More informationAircraft Cabin Acoustic Modeling
Penn State 2012 Center for Acoustics and Vibration Workshop Aircraft Cabin Acoustic Modeling 2012 Penn State Center for Acoustics and Vibration Workshop Adam Weston Senior Structural-Acoustics Specialist
More informationMeasurement and Prediction of Noise Propagation from a High-Power Jet Aircraft
12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference) 8-10 May 2006, Cambridge, Massachusetts AIAA 2006-2531 Measurement and Prediction of Noise Propagation from a High-Power Jet
More information(Gasdynamic, Strength, Heat Transfer, Combustion, Acoustic) (Study of different ABE architecture, ABE s Units & Systems Designing, Maintenance of
State Scientific Center (Moscow) Research Test Center (Turaevo, Moscow Region) (Gasdynamic, Strength, Heat Transfer, Combustion, Acoustic) (Study of different ABE architecture, ABE s Units & Systems Designing,
More informationAEROSPACE ENGINEERING
AEROSPACE ENGINEERING Subject Code: AE Course Structure Sections/Units Topics Section A Engineering Mathematics Topics (Core) 1 Linear Algebra 2 Calculus 3 Differential Equations 1 Fourier Series Topics
More informationSpatially Resolved Wind Tunnel Wake Measurements at High Angles of Attack and High Reynolds Numbers Using a Laser-Based Velocimeter
Spatially Resolved Wind Tunnel Wake Measurements at High Angles of Attack and High Reynolds Numbers Using a Laser-Based Velocimeter Daniel R. Cadel and K. Todd Lowe Dept. of Aerospace and Ocean Eng., Virginia
More informationProceedings of Meetings on Acoustics
Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Engineering Acoustics Session 1pEAa: Active and Passive Control of Fan
More informationTowards Reduced Order Modeling (ROM) for Gust Simulations
Towards Reduced Order Modeling (ROM) for Gust Simulations S. Görtz, M. Ripepi DLR, Institute of Aerodynamics and Flow Technology, Braunschweig, Germany Deutscher Luft und Raumfahrtkongress 2017 5. 7. September
More informationAcoustic Signal Processing. Algorithms for Reverberant. Environments
Acoustic Signal Processing Algorithms for Reverberant Environments Terence Betlehem B.Sc. B.E.(Hons) ANU November 2005 A thesis submitted for the degree of Doctor of Philosophy of The Australian National
More information25 years of PIV development for application in aeronautical test facilities
25 years of PIV development for application in aeronautical test facilities Jürgen Kompenhans and team Department Experimental Methods Institute of Aerodynamics and Flow Technology German Aerospace Center
More informationHELMHOLTZ RESONATORS FOR DAMPING COMBUSTOR THERMOACOUSTICS
HELMHOLTZ RESONATORS FOR DAMPING COMBUSTOR THERMOACOUSTICS Dong Yang and Aimee S. Morgans Department of Aeronautics, Imperial College London, London, UK, SW7 AZ email: d.yang13@imperial.ac.uk Helmholtz
More informationPrediction of noise from a wing-in-junction flow using computational fluid dynamics
Proceedings of Acoustics - Fremantle -3 November, Fremantle, Australia Prediction of noise from a wing-in-junction flow using computational fluid dynamics Con J. Doolan, Jesse L. Coombs, Danielle J. Moreau,
More informationDirect Soot Formation
Direct Soot Formation Claus Wahl 14 th ET Conference on Combustion Generated Particles August 1 st 4 th, 2010 Deutsches Zentrum für Luft und Raumfahrt. (DLR-Stuttgart) Mailing address DLR-VT Pfaffenwaldring
More informationSimulation And Cycle Analyses For High Bypass Turbofan Engine A Comparative Study
Proceedings of The National Conference On Undergraduate Research (NCUR) 2017 University of Memphis, TN Memphis Tennessee April 6-8, 2017 Simulation And Cycle Analyses For High Bypass Turbofan Engine A
More informationGRS Capita Selecta GIS in practice. Urban remote sensing at an international research institute. Dr. Wieke Heldens, MSc
GRS Capita Selecta GIS in practice Urban remote sensing at an international research institute Dr. Wieke Heldens, MSc Content From MGI student to scientist at DLR Remote sensing research as daily work
More informationUSING STATISTICAL ROOM ACOUSTICS FOR ANALYSING THE OUTPUT SNR OF THE MWF IN ACOUSTIC SENSOR NETWORKS. Toby Christian Lawin-Ore, Simon Doclo
th European Signal Processing Conference (EUSIPCO 1 Bucharest, Romania, August 7-31, 1 USING STATISTICAL ROOM ACOUSTICS FOR ANALYSING THE OUTPUT SNR OF THE MWF IN ACOUSTIC SENSOR NETWORKS Toby Christian
More informationOn predicting wind turbine noise and amplitude modulation using Amiet s theory
On predicting wind turbine noise and amplitude modulation using Amiet s theory Samuel Sinayoko 1 Jeremy Hurault 2 1 University of Southampton, ISVR, UK 2 Vestas, Isle of Wight, UK Wind Turbine Noise 2015,
More information