Welcome to Vibrationdata Acoustics Page

Tutorials ACOUSTICS - FINITE ELEMENT METHOD Acoustic Pressure Oscillation in a Pipe via the Finite Element Method: aco__pipe_FEM.pdf Acoustic Pressure Oscillation in a Two-Dimensional Pressure Field via the Finite Element Method using Triangular Elements: aco__triangle.pdf Matlab Script: acoustic_fea.m Supporting Functions: triangular_acoustic_local.m Generalized_Eigen.m Generalized_Eigen_semidefinite.m Airport and Aircraft Noise This section has moved to:  Airport & Aircraft Noise Page Architectural Acoustics Acoustic Transmission Loss: aco_tl.pdf Natural Frequencies of Rectangular Rooms: aco_rec.pdf Reverberation Time in Architectural Acoustics: reverb.pdf This tutorial also covers the Sabine equation and sound absorption. Sound Pressure Level in a Semireverberant Field: semirev.pdf Arthur Noxon, Auditorium Acoustics: aa101.pdf Atmospheric Sound Propagation Sonic and Vibration Environments for Ground Facilities - A Design Manual, Prepared for NASA by Wyle Laboratories: sonic_ground.pdf Atmospheric Sound Propagation from a Monopole Source via Direct, Reflected, and Surface Waves: direct_reflected.pdf Atmospheric Absorption: atmospheric_absorption.pdf Matlab Scripts Adjustment of SPL for ambient temperature and pressure: SPL_change_ambient.m Atmospheric Absorption: atmosphere_absorption.m Spherical propagation from a point source through the atmosphere with both direct and ground reflected waves: direct_reflected.m faddeeva.m progressbar.m Bruel & Kjaer Booklets Basic Concepts of Sound Basic Frequency Analysis of Sound Building Acoustics Environmental Noise Measurement Measuring Sound Microphones Sound Intensity PCB Microphone_Handbook  Environmental Noise and Abatement Noise Measurement: noise.pdf This tutorial also covers weighting networks for sound level meters. U.S. Army, Noise and Vibration Control: army_noise.pdf U.S. Army, Evaluation of Ground Vibrations Induced by Military Noise Sources: ERDC-TR-06-5.pdf Sound Behavior and Control, with Practical Diagrams. Developed by Stig Ingemansson, Ingemansson Technology, Gothenburg, Sweden. (Large File: 25 Mb). sound_control.pdf A Guide to Noise Control in Minnesota: noisecmin.pdf U.S. Department of Transportation, Highway Traffic Noise: highway.pdf U.S. Department of Transportation, Measurement of Highway-Related Noise: highway_related.pdf Highway Traffic Noise Analysis and Abatement: abate.pdf Transit Noise and Vibration Impact Assessment: FTA_Noise_and_Vibration_Manual.pdf Automotive Acoustic Glossary: auto_sounds.pdf The Use of Shrubs and Trees for Traffic Noise Attenuation: tree.pdf Environmental Noise (Bruel & Kjaer): bksv.pdf Washington State: Noise_Impact_Assessment.pdf Environmental Noise and Ground Vibration: Chapter12_Noise_Vibration.pdf Special Noise Barrier Application: WA_RD_304p1.pdf Outdoor Barrier Insertion Loss:  noise_barrier_attenuation.pdf Matlab script:  barrier_attenuation.m See also:  acoustic-to-seismic coupling page Sonic Booms McLaughlin, et al, Infrasound Detection of Rocket Launches: rocket_infrasound.pdf Wind Turbine Tower Infrasound in Nova Scotia: Silent_wind.pdf Sonic Booms, USAF Fact Sheet 96-03: SBFact.pdf FAA Sonic Boom Noise and Overpressure: sonicnoise.pdf Joseph E. Cates & B. Sturtevant, Seismic detection of sonic booms: seismicboom.pdf Predicting Launch Vehicle and Plume Sonic Boom using PCBoom3, Kenneth J. Plotkin, Wyle Laboratories: PCBoom3.pdf News Item: Navy Jets Cause Sonic Boom over Tampa. Registers as magnitude 2.7 quake: Tampa_sonic.pdf Filters A Pink Noise Filter: pink.pdf Pink Noise Sound Files: pink1.mp3 pink2.mp3 Helmholtz Resonators An Introduction to Helmholtz Resonators: helm.pdf Matlab script:  helmholtz.m NASA TM X-52367, Acoustic Liner Studies at the Lewis Research Center, 1967: Helmholtz_liner.pdf NASA TN D-5171, On the Design of Acoustic Liners for Rocket Engines: Helmholtz Resonators Evaluated with a Rocket Combustor: Acoustic_liner_design.pdf Hearing & Psychoacoustics FAA: Hearing & Noise in Aviation: hearing_brochure.pdf OSHA Regulations (Standards - 29 CFR) Occupational noise exposure. - 1926.52 osha1926.pdf Infrasound: Brief Review of Toxicological Literature: infra_toxi.pdf NASA TM X-2298, Relations Among Loudness, Loudness Level, and Sound-Pressure Level, 1971: Loudness_level.pdf HVAC & Piping Systems Natural Frequencies of Pipes: pipe.pdf   Wachel and Bates, Allowable Piping Vibration Levels Graph: piping_spec.pdf Trane, Specifying Quality Sound for HVAC Systems: Trane_HVAC.pdf Sound Transmission through Pipes and Ducts: pipe_transmission.pdf Ocean Acoustics  J. Hildebrand, Sources of Anthropogenic Sound in the Marine Environment: marine.pdf  Machinery  Noise Source Mechanisms in Axial Industrial Fans: fannoise.pdf Submitted by M.L.G. Boerlage, Fontys University of Professional Education, Netherlands. Vibrationdata.com student paper contest, Spring 2000. Understanding Transformer Noise: transformer.pdf Acoustic Radiation Efficiency Models of a Simple Gearbox TM-107226.pdf The Acoustic Characterisitcs of Turbomachinery Cavities (8.9 Mb) cr4671.pdf U.S. Army, Power Plant Acoustics powerplant.pdf Measuring Sound Hjelmgren, Dynamic Measurement of Pressure: 2002_34.pdf Absolute Pressure Calibrations of Microphones: abs_microphone.pdf Miscellaneous ELF/VLF Radiation Produced by the 1999 Leonid Meteors: Leonid.pdf Larkin, Effects of Military Noise on Wildlife: a Literature Review: noise_and_wildlife.pdf Mankin, et al, Acoustic Detection and Identification of Insects in Soil: insects.pdf Music The Fundamental Frequencies of Piano Keys:  piano.pdf Tuning Fork Sound and Vibration: tuning.pdf An Introduction to Music Theory: music.pdf Wind Chime Acoustics: WindChimes M.Fisher, Vibration Modes of a C4 Handbell: Holographic Interferometry and Finite Element Analysis: handbell.pdf Xaq Pitkow, Why do Octaves Sound the Same? oct_sound.pdf Daniel Irvine, Vibration Frequencies of Viola Strings (School Project): Daniel_Viola.pdf Physics Formulas for Calculating the Speed of Sound: speed.pdf   The Acoustic Power Spectrum: aco_pow.pdf   Acoustic Decibel Calculations for Air and Water: decibel.pdf Notes on Loudness and Decibels: notes_loudness.pdf Sound Power and Intensity: intens.pdf Adrian Secord, Sound Pressure Generated by a Bubble: bubble.pdf Rocket Vehicles NASA SP-8072, Acoustic Loads Generated by the Propulsion System: SP8072.pdf Non-Gaussian Acoustic Pressure Amplitudes in High-Intensity Sound Fields: nongaussian_acoustics.pdf See also: Rocket Page Transmission Loss Acoustic Transmission Loss: aco_tl.pdf Litvin & Belliston, Sound Transmission Loss through Concrete and Concrete Masonry Walls:  RD066.pdf Transmission Loss of a Plane Wave with Normal Incidence through a Multi-Layer Partition:  TL_multilayer.pdf Matlab Scripts: single_partition.m single_partition_plane_wave.m transmission_three_media.m transmission_five_media.m TL_incidence.m  Ultrasonics  Measuring Ultrasonic Properties of Materials: LLultra.pdf Vibroacoustics See: Vibroacoustics  Newsletters with Acoustic Articles Issue Feature Articles January 2007 shofar1.mp3 shofar2.mp3 shofar3.mp3 Electrophonic Sound Shofar Acoustics Seiches in Pools and Lakes Caused by Earthquakes     November 2006 Kawai_middle_C.mp3 Kawai_D.mp3 Kawai_A.mp3 Petrov_middle_C.mp3 Petrov_D.mp3 Petrov_A.mp3 Kawai_octave_A_A.mp3 Kawai_twelfth_A_E.mp3 Kawai_fifth_A_E.mp3 Kawai_fourth_A_D.mp3 Kawai_Major_Third_A_C_sharp.mp3 Kawai_Major_Sixth_A_F_sharp.mp3 Piano Acoustics  Musical Scales August_2006 Lissajous.m Disc Brake Squeal Lissajous Patterns March 2006 Gobi_sand.mp3 Sputnik1.wav Sputnik1b.wav Booming Sand Dunes and Beaches   Vibration in Naval Aviation    Sputnik Beep Acoustic Analysis    January 2006 Stuka.wav Silver_Comet.mp3 Stuka Dive Bomber Siren   Lockheed C130J Hercules Vibration   Model Rocket Liftoff Acoustics     IIT Tube   December 2005 LRAD.mp3 Balloon3.mp3 Long Range Acoustic Device  Football Player Head Acceleration  Simple Measurement of Room Reverberation Time  Taipei 101 Building Tuned Mass Damper  September 2005 singing_bowl.mp3 Tibetan Singing Bowls    Rogue Waves    June_2005  Death_Valley_whistler.mp3 NASA_whistler.mp3 Auroral_chorus.mp3 Earth Sferics, Tweeks & Whistlers    Auroral Chorus    Schumann Resonance   (Death Valley whistler is courtesy of Steve McGreevy ) May_2005  Centennial_bell.mp3 The Liberty Bell The Centennial Bell Elevator Jerk  March_2005  tuningfork440.mp3 Transformer Hum Magnetostriction Experiments  February_2005  Elephant Infrasound Slinky Science  October 2004 Hall_Flame_Bell.mp3 The Earth's Hum Bell Acoustics  April_2004 conure.mp3 flamingo.mp3 macaw.mp3 cockatoo.mp3 Bird Sounds 1. Golden Conure 2. Scarlet Macaw 3. Chilean Flamingo 4. Umbrella Cockatoo  March_2004 chime1.mp3 chime2.mp3 chime3.mp3 chime4.mp3 chime5.mp3  windchimes.mp3 thunder.mp3 hail.mp3 Wind Chime Sound & Vibration Thunderstorm Sounds    February 2004 Dream_speech.mp3 An Introduction to Human Speech Acoustic Analysis of Martin Luther King's "I Have a Dream" Speech  January 2004 crystal.wav Crystal Glass Singing Beverage Bottles as Helmholtz Resonators  June 2003 Train Horn Acoustics Doppler Shift Train Horn Chimes Train Horn Sounding in Pet Sounds  May 2003 1. The Sounding of Taps at President Kennedy's Funeral. This article discusses Sergeant Keith Clark's rendition of Taps at the funeral. 2. Helicopter Vibration per MIL-STD-810F April 2003 Apache Helicopter Noise. This article includes Fourier transforms of acoustic data that reveal the blade passing frequency and harmonics of each rotor.  March 2003 1. Paso Fino Hoof Beat Sound 2. Power Line Noise  February 2003 1. Space Shuttle Columbia Infrasound 2. Snapping Shrimp Acoustics   September 2002 1. Atomic Clocks 2. The Use of Tuning Forks in Medical Exams 3. Quartz Tuning Forks  July 2002 Space Shuttle Acoustics, Overpressure, and Vibration  June 2002 1. Bubble Acoustics 2. Molecular Vibration  May 2002 1. Acoustic Reverberant Chamber 2. Bolides  April 2002 1. Quartz Crystal Microbalances 2. Sonic Booms 3. Triangle Sound and Vibration  December 2001   Baseball Bat Sound and Vibration October 2001  1. The Kursk Submarine Disaster: A Shock & Vibration Perspective 2. How Astronauts Use Vibration to Measure Their Weight in Space

Software	Executable	Source
Pink noise generator.	pink.exe	pink.cpp
Transmission loss through a plenum chamber.	plenum.exe	plenum.cpp
Natural frequencies of acoustic modes.	acoustic.exe	_
Natural frequencies of rooms modes.	room_modes.exe	room_modes.cpp
Acoustic natural frequencies inside a cylinder.	cylinder.exe	cylinder.cpp
Calculation of a sound pressure level from a pressure time history.	SPL.exe	SPL.cpp
Calculation of a sound pressure level from a pressure power spectral density.	psd_to_spl.exe	psd_to_spl.cpp
Calculation of a pressure power spectral density from a sound pressure level.	spl_to_psd.exe	spl_to_psd.cpp
Add two SPLs.	add_SPLs.exe	add_SPLs.cpp
Overall dB level from SPL or similar function.	dB_RMS.exe	dB_RMS.cpp
One-third octave band SPL from a one-third octave function which has arbitrary frequencies, such as an interpolated curve.	spl_from_curve.exe	spl_from_curve.cpp
Speed of sound calculator.	speed.exe	_
Free-field acoustic radiation in a hemisphere pattern.	hemisphere.exe	hemisphere.cpp
Transmission loss through an expanded pipe.	expanded_pipe.exe	expanded_pipe.cpp
Transmission loss via the mass law.	mass_law.exe	mass_law.cpp
Doppler shift	doppler.exe	doppler.cpp
Frequency, Wavelength, Wavenumber, Wave Speed, c=(f )(lambda), Calculator	frequency_wavelength.exe	-

YouTube Video The Nature of Sound (1948) http://www.youtube.com/watch?v=JNBlEagFroU

Acoustic Books & Software