Engineering Noise Control
|
|
- Silvia Phillips
- 5 years ago
- Views:
Transcription
1 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 & Hall London Glasgow Weinheim New York Tokyo Melbourne Madras
2 Contents Preface Acknowledgments xv xvii 1. Fundamentals and basic terminology Introduction Noise-control strategies Existing installations, facilities and products Installations, facilities and products in the design stage Airborne versus structure-borne noise The acoustic field variables and wave equation Variables The acoustic field Magnitudes The speed of sound Dispersion Acoustic potential function and the wave equation Plane and spherical waves Plane wave propagation Spherical wave propagation Mean square quantities Sound intensity Plane wave and far field intensity Spherical wave intensity Sound power Units Spectra Frequency analysis A convenient property of one-third octave band center frequencies Combining sound pressures 36
3 vi Contents Addition of coherent sound pressures Addition of incoherent sound pressures (logarithmic addition) Subtraction of sound pressure levels Combining level reductions Impedance Mechanical impedance, Z m Specific acoustic impedance, Z Acoustic impedance, Z A Flow resistance The human ear Brief description of the ear External ear Middle ear Inner ear Cochlear duct, or partition of the inner ear Subjective response to sound pressure level Loudness Loudness level in phons Comparative loudness and the sone Pitch Masking 60 3 Instrumentation for noise measurement and analysis Microphones Condenser microphone Piezo-electric microphone Pressure response Microphone sensitivity Field effects and calibration Weighting networks Sound level meters Grades of sound level meter Sound level meter calibration Electrical calibration Acoustical calibration Noise measurements using sound level meters Microphone mishandling Sound level meter amplifier mishandling Microphone and sound level meter response characteristics Background noise Wind noise 78
4 Contents Vll Temperature Humidity and dust Reflections from nearby surfaces Time-varying sound Noise level measurement Statistical analyzers Noise dose meters Tape recording of noise Spectrum analyzers Intensity meters Sound intensity by the p-u method Sound intensity by the p-p method Frequency decomposition of the intensity Criteria Introduction Hearing loss Threshold shift Presbyacusis Hearing damage Hearing damage risk Requirements for speech recognition Quantifying hearing damage risk International Standards Organization formulation Alternative formulations Observed hearing loss Some alternative interpretations Hearing damage risk criteria Continuous noise Impulse noise Impact noise Speech interference criteria Broadband background noise Intense tones Psychological effects of noise Noise as a cause of stress Effect on behavior and work efficiency Ambient noise level specification Noise weighting curves Comparison of specifications Speech privacy Community noise level criteria A-weighting criteria Noise rating criteria 126
5 viii Contents 5. Sound sources and outdoor sound propagation Introduction Simple source Pulsating sphere Fluid mechanical monopole source Dipole source Pulsating doublet (far-field approximation) Vibrating sphere Fluid mechanical dipole source Quadrupole source (far-field approximation) Lateral quadrupole Longitudinal quadrupole Fluid mechanical quadrupole source Line source Infinite line source Finite line source Piston in an infinite baffle Far field Near field on axis Radiation load of the near field Incoherent plane radiator Single wall Several walls of a building or enclosure Directivity Reflection effects Simple source near a reflecting surface Observer near a reflecting surface Observer and source both close to a reflecting surface Reflection and transmission at a plane/two media interface Porous earth Plane wave reflection and transmission Spherical wave reflection at a plane interface Effects of turbulence Sound propagation outdoors, general concepts Review of methodology Limits to accuracy of prediction Forecasting schemes Geometrical spreading Directivity index Excess attenuation factor Air absorption Shielding by barriers 173
6 Contents Attenuation due to forests Ground effects Image inversion and increased attenuation at large distance Meteorological effects 185, Sound power, its use and measurement Introduction Radiation impedance Relation between sound power and sound pressure Radiation field of a sound source Free-field simulation in an anechoic room Sound field produced in an enclosure Determination of sound power using intensity measurements Determination of sound power using conventional pressure measurements Measurement in free or semi-free field Measurement in a diffuse field Field measurement Determination of sound power using surface vibration measurements Some uses of sound power information The far free field The near free field 220 Sound in enclosed spaces Introduction Wall-cavity modal coupling Sabine rooms Flat and long rooms Low frequencies Bound between low-frequency and high-frequency behavior Modal density Modal damping and bandwidth Modal overlap Cross-over frequency High frequencies, statistical analysis Effective intensity in a diffuse field Energy absorption at boundaries Air absorption Steady-state response Transient response 237 ix
7 X Contents Classical description Modal description Mean free path Measurement of the room constant Reference sound source method Reverberation time method Porous sound absorbers Measurement of absorption coefficients Porous liners Porous liners with perforated panel facings Sound absorption coefficients of materials in combination Panel sound absorbers Empirical method Analytical method Flat and long rooms Flat room with specularly reflecting floor and ceiling Flat room with diffusely reflecting floor and ceiling Flat room with specularly and diffusely reflecting boundaries Long room with specularly reflecting walls Long room with circular cross-section and diffusely reflecting wall Long room with rectangular cross-section Applications of sound absorption Relative importance of the reverberant field Reverberation control Optimizing reverberation control Acoustic enclosures and barriers Introduction Sound transmission through partitions Bending waves Transmission loss Panel transmission loss Double wall transmission loss Common building materials Sound-absorptive linings Composite transmission loss Enclosures Noise inside enclosures Noise outside enclosures 308
8 Contents XI Personnel enclosures Enclosure windows Enclosure leakages Access and ventilation Enclosure vibration isolation Enclosure resonances Close-fitting enclosures Partial enclosures Barriers Diffraction at the edge of a thin sheet Outdoor barriers Indoor barriers Pipe lagging 332 / Porous material lagging Impermeable jacket and porous blanket lagging Muffling devices Introduction Measures of performance Diffusers as muffling devices Classification of muffling devices Acoustic impedance Lumped element devices Impedance of an orifice or a short narrow duct Impedance of a volume Reactive devices Acoustical analogs of Kirchoff s laws Side branch resonator Expansion chamber Small engine exhaust Lowpass filter Pressure drop calculations for reactive muffling devices Flow-generated noise Lined ducts Locally reacting and bulk reacting liners Liner specification Lined duct silencers Cross-sectional discontinuities Pressure drop calculations for dissipative mufflers Duct bends Unlined ducts Effect of duct end reflections Duct break-out noise 391
9 Xll Contents Break-out sound transmission Break-in sound transmission 9.13 Lined plenum attenuator 9.14 Water injection 9.15 Directivity of exhaust ducts Vibration control Introduction Vibration isolation Single-degree-of-freedom systems Multi-degree-of-freedom systems Damping, stiffness and mass relationships Lack of stiffness of equipment mounted on isolators Lack of stiffness of foundations Superimposed loads on isolators Types of isolators Rubber Metal springs Cork Felt Air springs Vibration absorbers Vibration measurement Acceleration transducers Velocity transducers Instrumentation systems Units of vibration Damping of vibrating surfaces When damping is effective and ineffective Damping methods Measurement of damping Sound power and sound pressure level estimation procedures Introduction Fan noise Air compressors Small compressors Large compressors (noise levels within the inlet and exit piping) Large compressors (exterior noise levels) Compressors for refrigeration units Cooling towers 440
10 Contents 11.6 Pumps Jet noise General estimation procedures Gas and steam vents General jet noise control Control valve noise Internal sound power generation Internal sound pressure level External sound pressure level Control valve noise reduction Control valves for liquids Control valves for steam Pipe flow noise Boiler noise Turbine noise Diesel and gas-driven engines Exhaust noise Casing noise Inlet noise Furnace noise Electrical motor noise Small electric motors (below 300 kw) Large electric motors (above 300 кw) Generators Transformers Gear noise Active noise control Introduction Active control of sound propagation in ducts Active control of plane wave propagation Active control of higher order mode propagation Periodic feedforward controller Random noise feedforward controller Feedback controller Control sound sources Microphones Active control of sound radiation from vibrating structures Physical control mechanisms Control actuators and error sensors Sound transmission into enclosed spaces Active vibration isolation Electronic controller design 491 хш
11 xiv Contents 13 Survey of analytical techniques for the estimation of sound power levels Introduction Low-frequency region Helmholtz method Rayleigh method Simple acoustic modeling High-frequency region 501 Appendix A Problems 502 Appendix В Properties of materials 512 Appendix С Acoustical properties of porous materials, 514 Appendix D Absorption coefficients based upon impedance tube measurements 521 Appendix E Porous liners 526 Appendix F Frequency analysis 530 References 546 List of Acoustical Standards 559 Glossary of symbols 568 Index 589
Engineering Noise Control
Engineering Noise Control The practice of engineering noise control demands a solid understanding of the fundamentals of acoustics, the practical application of current noise control technology and the
More informationFundamentals of noise and Vibration analysis for engineers
Fundamentals of noise and Vibration analysis for engineers M.P.NORTON Department of Mechanical Engineering, University of Western Australia CAMBRIDGE UNIVERSITY PRESS Preface xii Acknowledgements xv Introductory
More informationThe diagram below. to the by the. outlet into. calculation. Since TRANSMISSION VIA STRUCTURE. Vibration Via Supports Duct Breakout
NOISE CONTROL IN VENTILATING SYSTEMS INTRODUCTION The diagram below shows the various noise sources and transmission paths of plant rooms and ventilation systems. For the ventilation system this can be
More informationSound radiation and transmission. Professor Phil Joseph. Departamento de Engenharia Mecânica
Sound radiation and transmission Professor Phil Joseph Departamento de Engenharia Mecânica SOUND RADIATION BY A PISTON The piston generates plane waves in the tube with particle velocity equal to its own.
More informationNoise in enclosed spaces. Phil Joseph
Noise in enclosed spaces Phil Joseph MODES OF A CLOSED PIPE A 1 A x = 0 x = L Consider a pipe with a rigid termination at x = 0 and x = L. The particle velocity must be zero at both ends. Acoustic resonances
More informationIntroduction to Acoustics Exercises
. 361-1-3291 Introduction to Acoustics Exercises 1 Fundamentals of acoustics 1. Show the effect of temperature on acoustic pressure. Hint: use the equation of state and the equation of state at equilibrium.
More informationAnswer - SAQ 1. The intensity, I, is given by: Back
Answer - SAQ 1 The intensity, I, is given by: Noise Control. Edited by Shahram Taherzadeh. 2014 The Open University. Published 2014 by John Wiley & Sons Ltd. 142 Answer - SAQ 2 It shows that the human
More informationFormulas of Acoustics
F. P. Mechel (Ed.) Formulas of Acoustics With contributions by M. L. Munjal M. Vorländer P. Költzsch M. Ochmann A. Cummings W. Maysenhölder W. Arnold O. V. Rudenko With approximate 620 Figures and 70 Tables
More informationHEAT TRANSFER THERMAL MANAGEMENT OF ELECTRONICS YOUNES SHABANY. C\ CRC Press W / Taylor Si Francis Group Boca Raton London New York
HEAT TRANSFER THERMAL MANAGEMENT OF ELECTRONICS YOUNES SHABANY C\ CRC Press W / Taylor Si Francis Group Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Group, an informa business
More informationMeasures and sources of sound. Professor Phil Joseph
Measures and sources of sound Professor Phil Joseph WHAT IS NOISE? Sound may be defined as a time-varying fluctuation of the density of a fluid from its ambient (mean) state, which is accompanied by a
More informationNumber Title Year Organization Page
Id Number Title Year Organization Page 19690 S1.1 Acoustical Terminology Errata; ASA 111 R(1999) 1994 ASA 0 19691 S1.4 Specification for Sound Level Meters ASA 47-1983 1983 ASA 0 19692 S1.6 Preferred Frequencies,
More informationvii Preface ix Acknowledgements
Series Preface vii Preface ix Acknowledgements xi Chapter 1: Introduction 1 1.1 Brief History of Underwater Sound Transducers..... 2 1.2 Underwater Transducer Applications... 9 1.3 General Description
More informationEffect of effective length of the tube on transmission loss of reactive muffler
Effect of effective length of the tube on transmission loss of reactive muffler Gabriela Cristina Cândido da SILVA 1 ; Maria Alzira de Araújo NUNES 1 1 University of Brasilia, Brazil ABSTRACT Reactive
More informationNoise and Vibration of Electrical Machines
Noise and Vibration of Electrical Machines P. L. TIMÄR A. FAZEKAS J. KISS A. MIKLOS S. J. YANG Edited by P. L. Timär ш Akademiai Kiadö, Budapest 1989 CONTENTS Foreword xiii List of symbols xiv Introduction
More informationNumerical Model of the Insertion Loss Promoted by the Enclosure of a Sound Source
Numerical Model of the Insertion Loss Promoted by the Enclosure of a Sound Source Gil F. Greco* 1, Bernardo H. Murta 1, Iam H. Souza 1, Tiago B. Romero 1, Paulo H. Mareze 1, Arcanjo Lenzi 2 and Júlio A.
More informationC ONTENTS CHAPTER TWO HEAT CONDUCTION EQUATION 61 CHAPTER ONE BASICS OF HEAT TRANSFER 1 CHAPTER THREE STEADY HEAT CONDUCTION 127
C ONTENTS Preface xviii Nomenclature xxvi CHAPTER ONE BASICS OF HEAT TRANSFER 1 1-1 Thermodynamics and Heat Transfer 2 Application Areas of Heat Transfer 3 Historical Background 3 1-2 Engineering Heat
More informationSound power level measurement in diffuse field for not movable sources or emitting prominent discrete tones
CFA 2018 - Le Havre Sound power level measurement in diffuse field for not movable sources or emitting prominent discrete tones F. Bessaca et P. Cellardb a CETIAT, Domaine Scientifique de la Doua, 25,
More informationMETHODS OF THEORETICAL PHYSICS
METHODS OF THEORETICAL PHYSICS Philip M. Morse PROFESSOR OF PHYSICS MASSACHUSETTS INSTITUTE OF TECHNOLOGY Herman Feshbach PROFESSOR OF PHYSICS MASSACHUSETTS INSTITUTE OF TECHNOLOGY PART II: CHAPTERS 9
More informationSound Rating of Ducted Air Moving and Conditioning Equipment
AHRI Standard 260 (I-P) 2017 Standard for Sound Rating of Ducted Air Moving and Conditioning Equipment IMPORTANT SAFETY DISCLAIMER AHRI does not set safety standards and does not certify or guarantee the
More informationEXPERIMENTAL INVESTIGATION OF NOISE PARAMETERS IN HVAC SYSTEMS
The 40 th International Conference on Mechanics of Solids, Acoustics and Vibrations & The 6th International Conference on Advanced Composite Materials Engineering ICMSAV2016& COMAT2016 Brasov, ROMANIA,
More informationDesign of Mufflers and Silencers. D. W. Herrin, Ph.D., P.E. University of Kentucky Department of Mechanical Engineering
D. W. Herrin, Ph.D., P.E. Department of Mechanical Engineering Types of Mufflers 1. Dissipative (absorptive) silencer: Duct or pipe Sound absorbing material (e.g., duct liner) Sound is attenuated due to
More informationMethod of Measuring Machinery Sound Within an Equipment Space
ANSI/AHRI Standard 575 (Formerly ARI Standard 575) 2008 Standard for Method of Measuring Machinery Sound Within an Equipment Space Price $15.00 (M) $30.00 (NM) Printed in U.S.A. 8Copyright 1994, by Air-Conditioning
More informationEvaluation of standards for transmission loss tests
Evaluation of standards for transmission loss tests M. Cassidy, R. K Cooper, R. Gault and J. Wang Queen s University Belfast, School of Mechanical and Aerospace Engineering, Ashby Building, Stranmillis
More informationunit 4 acoustics & ultrasonics
unit 4 acoustics & ultrasonics acoustics ACOUSTICS Deals with the production, propagation and detection of sound waves Classification of sound: (i) Infrasonic 20 Hz (Inaudible) (ii) Audible 20 to 20,000Hz
More informationIntroduction to the Electronic Properties of Materials
Introduction to the Electronic Properties of Materials David Jiles Ames Laboratory US Department of Energy and Department of Materials Science and Engineering and Department of Electrical and Computer
More informationTest Report. RI Acoustic Lab. Measurement of Sound Absorption Coefficient for RockDelta NoiStop Noise Barrier. 20 Feb. 07
Test Report RI Acoustic Lab Measurement of Sound Absorption Coefficient for RockDelta NoiStop Noise Barrier 20 Feb. 07 Title Measurement of Sound Absorption Coefficient for RockDelta NoiStop Noise Barrier
More informationON SOUND POWER MEASUREMENT OF THE ENGINE IN ANECHOIC ROOM WITH IMPERFECTIONS
ON SOUND POWER MEASUREMENT OF THE ENGINE IN ANECHOIC ROOM WITH IMPERFECTIONS Mehdi Mehrgou 1, Ola Jönsson 2, and Leping Feng 3 1 AVL List Gmbh., Hans-list-platz 1,8020, Graz, Austria 2 Scania CV AB, Södertälje,
More informationCONVECTION HEAT TRANSFER
CONVECTION HEAT TRANSFER THIRD EDITION Adrian Bejan J. A. Jones Professor of Mechanical Engineering Duke University Durham, North Carolina WILEY JOHN WILEY & SONS, INC. CONTENTS Preface Preface to the
More informationAN INTRODUCTION TO NOISE CONTROL IN
AN INTRODUCTION TO NOISE CONTROL IN BUILDINGS Paul Guyer, P.E., R.A. J. PAUL GUYER, P.E., R.A. Paul Guyer is a registered Mechanical Engineer, Civil Engineer, Fire Protection Engineer and Architect with
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 informationFundamentals of Noise and Vibration Analysis for Engineers
- Fundamentals of Noise and Vibration Analysis for Engineers Second edition M. P. Norton School of Mechanical Engineering, University of Western Australia and D. G. Karczub S.Y.T. Engineering Consultants,
More informationinter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering August 2000, Nice, FRANCE
Copyright SFA - InterNoise 2000 1 inter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering 27-30 August 2000, Nice, FRANCE I-INCE Classification: 1.1 DESIGN OF TERMINATING
More informationSound, acoustics Slides based on: Rossing, The science of sound, 1990, and Pulkki, Karjalainen, Communication acoutics, 2015
Acoustics 1 Sound, acoustics Slides based on: Rossing, The science of sound, 1990, and Pulkki, Karjalainen, Communication acoutics, 2015 Contents: 1. Introduction 2. Vibrating systems 3. Waves 4. Resonance
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 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 informationPART VIII: ABSORPTIVE SILENCER DESIGN
PART VIII: ABSORPTIVE SILENCER DESIGN Elden F. Ray June 10, 2013 TABLE OF CONTENTS Introduction 2 Silencer Performance 4 Flow Resistance and Resistivity 7 Flow Velocity 7 Baffle Attenuation Example 7 Silencer
More informationSound Engineering Test and Analysis
Sound Engineering Test and Analysis Product sound and sound quality are key aspects of product perception. How a product sounds plays a critical role in conveying the right message about its functionality,
More informationISO 5136 INTERNATIONAL STANDARD. Acoustics Determination of sound power radiated into a duct by fans and other air-moving devices In-duct method
INTERNATIONAL STANDARD ISO 5136 Second edition 2003-04-01 Acoustics Determination of sound power radiated into a duct by fans and other air-moving devices In-duct method Acoustique Détermination de la
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 informationAn Introduction to Noise Control in Buildings (Live Webinar)
PDHonline Course M345W (4 PDH) An Introduction to Noise Control in Buildings (Live Webinar) Instructor: J. Paul Guyer, P.E., R.A., Fellow ASCE, Fellow AEI 2012 PDH Online PDH Center 5272 Meadow Estates
More informationIndex. Index. More information. in this web service Cambridge University Press
A-type elements, 4 7, 18, 31, 168, 198, 202, 219, 220, 222, 225 A-type variables. See Across variable ac current, 172, 251 ac induction motor, 251 Acceleration rotational, 30 translational, 16 Accumulator,
More informationVibration Generations Mechanisms: Flow Induced
Vibration Generations Mechanisms: Flow Induced Introduction That sound and vibration generation and flow are correlated is apparent from a range of phenomena that we can observe around us. A noteworthy
More informationTHE ACOUSTIC IMPEDANCE MEASUREMNET SYSTEM USING TWO MICROPHONES
P-7 THE ACOUSTIC IMPEDANCE MEASUREMNET SYSTEM USING TWO MICROPHONES RYU, YUNSEON BRUEL & KJAER SOUND & VIBRATION MEASUREMENT A/S SKODSBORGVEJ 307 NAERUM 2850 DENMARK TEL : +45 77 41 23 87 FAX : +45 77
More informationReactive Silencer Modeling by Transfer Matrix Method and Experimental Study
Reactive Silencer Modeling by ransfer Matrix Method and Experimental Study OVIDIU VASILE *, KOLUMBAN VLADIMIR ** * Department of Mechanics University POLIEHNICA of Bucharest Splaiul Independentei, post
More informationConsultancy Report Ref: 9383-R01
Consultancy Report Ref: 9383-R01 Submitted to: Prepared by: Mr Tim Simmons The Woolley Shepherd Secret Meadow Weekmoor Milverton Taunton TA4 1QE John Fithyan Laboratory Manager Approved for issue by: Andy
More informationTransmission Loss of a Dissipative Muffler with Perforated Central Pipe
Transmission Loss of a Dissipative Muffler with Perforated Central Pipe 1 Introduction This example problem demonstrates Coustyx ability to model a dissipative muffler with a perforated central pipe. A
More informationChapter 10 Sound in Ducts
Chapter 10 Sound in Ducts Slides to accompany lectures in Vibro-Acoustic Design in Mechanical Systems 01 by D. W. Herrin Department of Mechanical Engineering Lexington, KY 40506-0503 Tel: 859-18-0609 dherrin@engr.uky.edu
More information9. TRANSMISSION OF SOUND THROUGH STRUCTURES
NOISE CONTROL Transmission 9.1 9. TRANSMISSION OF SOUND THROUGH STRUCTURES 9.1 Basic Definitions A typical noise control application involves a combination of absorption of sound and transmission of sound
More informationLesson 13. Basic Concepts in Architectural Acoustics INTRODUCTION
Lesson 13 Basic Concepts in Architectural Acoustics 13.1 Introduction. 13.2 The nature of sound. 13.3 Properties of sound. 13.4 Propagation of sound. 13.5 Sound power and sound intensity. 13.6 Effect of
More informationLesson Propagation of sound Sound fields Spherical, cylindrical and perpendicular wave fronts.
Lesson 13 Basic Concepts in Architectural Acoustics 13.1 Introduction. 13.2 The nature of sound. 13.2.1. Sound waves. 13.2.2. Frequency range of sound. 13.2.3. The audible range of sound. 13.3 Properties
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 informationDesign of Partial Enclosures. D. W. Herrin, Ph.D., P.E. University of Kentucky Department of Mechanical Engineering
D. W. Herrin, Ph.D., P.E. Department of Mechanical Engineering Reference 1. Ver, I. L., and Beranek, L. L. (2005). Control Engineering: Principles and Applications. John Wiley and Sons. 2. Sharp, B. H.
More informationIntroduction to Building Acoustics and Noise Control
Introduction to Building Acoustics and Noise Control Course No: M04-019 Credit: 4 PDH J. Paul Guyer, P.E., R.A., Fellow ASCE, Fellow AEI Continuing Education and Development, Inc. 9 Greyridge Farm Court
More informationISO INTERNATIONAL STANDARD. Acoustics Acoustic insulation for pipes, valves and flanges
INTERNATIONAL STANDARD ISO 15665 First edition 2003-08-15 Acoustics Acoustic insulation for pipes, valves and flanges Acoustique Isolation acoustique des tuyaux, clapets et brides Reference number ISO
More informationNumerical Prediction of the Radiated Noise of Hermetic Compressors Under the Simultaneous Presence of Different Noise Sources
Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 1998 Numerical Prediction of the Radiated Noise of Hermetic Compressors Under the Simultaneous
More informationDevelopment of a small-scale reverberation room
Proceedings of ACOUSTICS 2016 9-11 November 2016, Brisbane, Australia Development of a small-scale reverberation room Alexander Rasa Noise Control Research & Development, Pyrotek Pty Ltd, Sydney, Australia
More informationLABORATORY MEASUREMENTS OF THE SOUND ABSORPTION COEFFICIENTS OF OSCAR EVO-PANELS
Report No. L/3237 Page 1 of 8 for Oscar Acoustics Michaels Lane Ash Kent TN15 7HT Dated: 24 July 2012 LABORATORY MEASUREMENTS OF THE SOUND ABSORPTION COEFFICIENTS OF OSCAR EVO-PANELS Report Author: M Sawyer
More informationSound radiation of a plate into a reverberant water tank
Sound radiation of a plate into a reverberant water tank Jie Pan School of Mechanical and Chemical Engineering, University of Western Australia, Crawley WA 6009, Australia ABSTRACT This paper presents
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 informationModeling and simulation of windows with noise mitigation and natural ventilation
Modeling and simulation of windows with noise mitigation and natural ventilation Xiang YU ; Fangsen CUI ; ze-tiong TAN 2 ; Kui YAO 3 Institute of High Performance Computing, A*TAR, ingapore 2 Building
More informationUniversity of Kentucky
Introduction David Herrin Wave Animation http://www.acs.psu.edu/drussell/demos/waves-intro/waves-intro.html 2 Wave Motion Some Basics Sound waves are pressure disturbances in fluids, such as air or hydraulic
More informationMeasurement of Acoustic Properties of light weight concrete SL-Deck
DELTA Test Report TEST Reg. no. 100 Measurement of Acoustic Properties of light weight concrete SL-Deck Performed for Abeo A/S Project no.: I100486 Page 1 of 25 30 June 2014 DELTA Venlighedsvej 4 2970
More informationMicro-perforates in vibro-acoustic systems Li CHENG
Micro-perforates in vibro-acoustic systems Li CHENG Chair Professor and Director Consortium for Sound and Vibration research Department of Mechanical Engineering The Hong Kong Polytechnic University CAV
More informationTable of Contents. Foreword... xiii. Preface... xv
Table of Contents Foreword.... xiii Preface... xv Chapter 1. Fundamental Equations, Dimensionless Numbers... 1 1.1. Fundamental equations... 1 1.1.1. Local equations... 1 1.1.2. Integral conservation equations...
More informationNoise Testing and Prediction Methods for Multi-Point Ground Flares
Noise Testing and Prediction Methods for Multi-Point Ground Flares Justin Roberts Flare Applications Engineer, Zeeco American Flame Research Committee (AFRC) Industrial Combustion Symposium September 14,
More informationISO 354 INTERNATIONAL STANDARD. Acoustics Measurement of sound absorption in a reverberation room
INTERNATIONAL STANDARD ISO 354 Second edition 2003-05-15 Acoustics Measurement of sound absorption in a reverberation room Acoustique Mesurage de l'absorption acoustique en salle réverbérante Reference
More informationLast time: small acoustics
Last time: small acoustics Voice, many instruments, modeled by tubes Traveling waves in both directions yield standing waves Standing waves correspond to resonances Variations from the idealization give
More informationTurbines and turbine sets Measurement of emitted airborne noise Engineering/survey method
INTERNATIONAL STANDARD ISO 10494 Second edition 2018-04 Turbines and turbine sets Measurement of emitted airborne noise Engineering/survey method Turbines et groupes de turbines Mesurage du bruit aérien
More informationAPPENDIX B. Noise Primer
APPENDIX B Noise Primer NOISE PRIMER TABLE OF CONTENTS 1. INTRODUCTION...1 2. BASIC SOUND PRINCIPLES...1 2.1. SOUND AS A WAVE...1 2.2. SOUND PRESSURE LEVEL...2 2.2.1. Decibel Math...4 2.2.2. Descriptive
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 informationEUROVENT 8/12 SOUND TEST METHOD FOR DUCTED FAN COIL UNITS. FCP 2008 testing procedures FCP acoustical test method pag. 1
EUROVENT 8/12 SOUND TEST METHOD FOR DUCTED FAN COIL UNITS FCP 2008 testing procedures FCP acoustical test method pag. 1 CONTENTS 1 - PURPOSE... 3 2 - NORMATIVE REFERENCES... 3 3 - DEFINITIONS... 3 3.1
More informationCONVECTION HEAT TRANSFER
CONVECTION HEAT TRANSFER SECOND EDITION Adrian Bejan J. A. Jones Professor of Mechanical Engineering Duke University Durham, North Carolina A WILEY-INTERSCIENCE PUBUCATION JOHN WILEY & SONS, INC. New York
More information1 Wind Turbine Acoustics. Wind turbines generate sound by both mechanical and aerodynamic
Wind Turbine Acoustics 1 1 Wind Turbine Acoustics Wind turbines generate sound by both mechanical and aerodynamic sources. Sound remains an important criterion used in the siting of wind farms. Sound emission
More informationExperimental study on the aeroacoustic characterization of exhaust mufflers in the presence of mean flow
Experimental study on the aeroacoustic characterization of exhaust mufflers in the presence of mean flow B. Vanelderen, W. De Roeck, D. Vandeun, Y. Mattheys, P. Sas, W. Desmet K.U.Leuven, Department of
More informationChapter 17: Waves II. Sound waves are one example of Longitudinal Waves. Sound waves are pressure waves: Oscillations in air pressure and air density
Sound waves are one example of Longitudinal Waves Sound waves are pressure waves: Oscillations in air pressure and air density Before we can understand pressure waves in detail, we need to understand what
More informationACS Fluid Structure Interaction
ACS 519 - Fluid Structure Interaction Spring 2009 Instructor: Stephen A. Hambric Office: Garfield Thomas Water Tunnel Hours: By appointment email: sah19@arl.psu.edu Phone: (814) 863-3030 Fluid-structure
More informationDELTA Test Report. Measurement of sound absorption coefficient for 15 mm Fraster felt Plus acoustic panels with mounting depth 45 mm
DELTA Test Report TEST Reg. no. 100 Measurement of sound absorption coefficient for 15 mm Fraster felt Plus acoustic panels with mounting depth 45 mm Performed for Fraster ApS DANAK 100/2275 Project no.:
More informationA simple model for estimating excess attenuation of road traffic noise
A simple model for estimating excess attenuation of road traffic noise Kohei Yamamoto and Mitsuyasu Yamashita Kobayasi Institute of Physical Research, 3-20-41, Higashimotomachi, Kokubunji, 185 Japan (Received
More informationEffect of Length and Porosity on the Acoustic Performance of Concentric Tube Resonators
Effect of Length and Porosity on the Acoustic Performance of Concentric Tube Resonators David Neihguk *1, and Abhinav Prasad 1 1 Mahindra Research Valley, Mahindra & Mahindra Ltd. *Corresponding author:
More informationTheory and Design for Mechanical Measurements
Theory and Design for Mechanical Measurements Third Edition Richard S. Figliola Clemson University Donald E. Beasley Clemson University John Wiley & Sons, Inc. New York / Chichester / Weinheim / Brisbane
More informationAn Introduction to the Fundamentals of Acoustics
PDHonline Course M350 (2 PDH) An Introduction to the Fundamentals of Acoustics Instructor: J. Paul Guyer, P.E., R.A., Fellow ASCE, Fellow AEI 2012 PDH Online PDH Center 5272 Meadow Estates Drive Fairfax,
More informationImpedance correction for a branched duct in a thermoacoustic air-conditioner
20-22 November 2006, Christchurch, New ealand Impedance correction for a branched duct in a thermoacoustic air-conditioner Carl Howard School of Mechanical Engineering, The University of Adelaide, Adelaide,
More informationAcoustic design of lightweight cabin walls for cruise ships
Acoustic design of lightweight cabin walls for cruise ships A. Treviso 1, M. G. Smith 1 1 ISVR Consulting, University of Southampton University Road, SO17 BJ1, Southampton, United Kingdom e-mail: mgs@isvr.soton.ac.uk
More informationAcoustics-An An Overview. Lecture 1. Vibro-Acoustics. What? Why? How? Lecture 1
Vibro-Acoustics Acoustics-An An Overview 1 Vibro-Acoustics What? Why? How? 2 Linear Non-Linear Force Motion Arbitrary motion Harmonic Motion Mechanical Vibrations Sound (Acoustics) 3 Our heart beat, our
More informationApplied Fluid Mechanics
Applied Fluid Mechanics 1. The Nature of Fluid and the Study of Fluid Mechanics 2. Viscosity of Fluid 3. Pressure Measurement 4. Forces Due to Static Fluid 5. Buoyancy and Stability 6. Flow of Fluid and
More informationComparison of Noise Test Codes when Applied to air Compressors
VDI-Berichte Nr. 1932, 2006 A 6 83 Comparison of Noise Test Codes when Applied to air Compressors Michael J. Lucas, INCE Bd. Cert., Ingersoll-Rand Company, Davidson/NC INTRODUCTION Beginning January 2004,
More informationLIST OF PUBLISHED STANDARDS
Report : 08-06- Page o : Of 9 LST OF PUBLSHED STDRDS Total Count: 9 umber SS umber nt pproved mendment SBS/TC 076 SS 40-:997/SO 40-:997 coustics - Measurement of sound insulation in buildings and of building
More informationMeasurement of sound absorption coefficient for Fraster felt SpaceCover
DELTA Test Report TEST Reg. no. 100 Measurement of sound absorption coefficient for Fraster felt SpaceCover Performed for Fraster ApS Project no.: I100645 Page 1 of 9 27 November 2014 DELTA Venlighedsvej
More informationActive Minimization of Acoustic Energy Density to Attenuate Radiated Noise from Enclosures
Active Minimization of Acoustic Energy Density to Attenuate Radiated Noise from Enclosures Andrew J. Boone Department of Mechanical Engineering Brigham Young University 435 CTB Provo, UT 8460 Abstract
More informationMethod of estimating the reverberant sound absorption coefficient of the absorbing structure composed of different plane porous materials
J. Acoust. Soc. Jpn. (E) 1, 1 (1980) Method of estimating the reverberant sound absorption coefficient of the absorbing structure composed of different plane porous materials Kyoji Fujiwara and Yasuo Makita
More informationHelmholtz resonator with multi-perforated plate
Helmholtz resonator with multi-perforated plate Diogo Filipe Alves Cabral diogo.a.cabral@ist.utl.pt Instituto Superior Técnico, Universidade Técnica de Lisboa, Portugal November 2016 Abstract The present
More informationStatistical Energy Analysis Software & Training Materials, Part II
Statistical Energy Analysis Software & Training Materials, Part II Tom Irvine Dynamic Concepts, Inc. NASA Engineering & Safety Center (NESC) 20-22 June 2017 The Aerospace Corporation 2010 The Aerospace
More informationActive Impact Sound Isolation with Floating Floors. Gonçalo Fernandes Lopes
Active Impact Sound Isolation with Floating Floors Gonçalo Fernandes Lopes Outubro 009 Active impact sound isolation with floating floors Abstract The users of buildings are, nowadays, highly demanding
More informationStandard Terminology Relating to Environmental Acoustics 1
Designation: C 634 00 An American National Standard Standard Terminology Relating to Environmental Acoustics 1 This standard is issued under the fixed designation C 634; the number immediately following
More informationACOUSTIC INTRINSIC PERFORMANCES OF NOISE BARRIERS: ACCURACY OF IN SITU MEASUREMENT TECHNIQUES
Twelfth International Congress on Sound and Vibration ACOUSTIC INTRINSIC PERFORMANCES OF NOISE BARRIERS: ACCURACY OF IN SITU MEASUREMENT TECHNIQUES Francesco Asdrubali, Giulio Pispola and Francesco D Alessandro
More informationAcoustic Transmission Loss of Perforated Plates
8th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference) - 6 June, Colorado Springs, CO AIAA -7 Acoustic Transmission Loss of Perforated Plates Vincent Phong and Dimitri Papamoschou
More informationVibro-Acoustic Modelling of Hermetic Reciprocating Compressors
Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 1998 Vibro-Acoustic Modelling of Hermetic Reciprocating Compressors L. Gavric CETIM Follow
More informationSystem Dynamics for Engineering Students Concepts and Applications
System Dynamics for Engineering Students Concepts and Applications Nicolae Lobontiu University of Alaska Anchorage "Ж AMSTERDAM BOSTON HEIDELBERG LONDON NEW YORK OXFORD PARIS SAN DIEGO SAN FRANCISCO SINGAPORE
More informationA simple formula for insertion loss prediction of large acoustical enclosures using statistical energy analysis method
csnak, 014 Int. J. Nav. Archit. Ocean Eng. (014) 6:894~903 http://dx.doi.org/10.478/ijnaoe-013-00 pissn: 09-678, eissn: 09-6790 A simple formula for insertion loss prediction of large acoustical enclosures
More informationDELTA Test Report. DANAK TEST Reg. no Measurement of Sound Absorption Coefficient for Kvadrat Soft Cells Wall Panel Type Time
We help ideas meet the real world DELTA Test Report DANAK TEST Reg. no. 100 Measurement of Sound Absorption Coefficient for Kvadrat Soft Cells Wall Panel Type Time Client: Kvadrat Soft Cells A/S Page 1
More information