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Mark ZimmermanTypewritten TextATI Course Schedule:Applied Physical Oceanography and Acoustics:
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Mark ZimmermanTypewritten TextProfessional Development Short Course On:
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Mark ZimmermanTypewritten TextApplied Physical Oceanography
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Mark ZimmermanTypewritten TextInstructor:
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Mark ZimmermanTypewritten TextDr. Juan I. Arvelo
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ObjectivesObjectives
One-Day Crash Course Coverage Of State-of-the-Art In Underwater Acoustics & Sonar Systems
Illustrations, Animations & Audiovisuals Heavily Used To Help “Visualize” Concepts
Furnish Literature Books, Technical Reports & Research Journals For In-Depth References
Hyperlinks To Internet Resources (e.g., Websites &Podcasts) For Up-To-Date Information
One-Day Crash Course Coverage Of State-of-the-Art In Underwater Acoustics & Sonar Systems
Illustrations, Animations & Audiovisuals Heavily Used To Help “Visualize” Concepts
Furnish Literature Books, Technical Reports & Research Journals For In-Depth References
Hyperlinks To Internet Resources (e.g., Websites &Podcasts) For Up-To-Date Information
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Sound AbsorptionSound Absorption
Absorption vs. Attenuation (Careful!) Words Often Used Interchangeably Absorption Is One Attenuation Component Absorption Is Energy Lost To Heat Attenuation In Architectural Acoustics Defined As
Sum Of Energy Lost To Heat & Transmission Attenuation In Underwater Sound Propagation
Defined As Sum Of Energy Lost To Heat & Scattering Units Often Used For Sound Propagation
= dB/nepers = m / 8.686 m = dB/m = / k = dB/km = 1000 m f = dB/kHz-m = 8.686 / f(kHz) = dB/ = 8.686
Absorption vs. Attenuation (Careful!) Words Often Used Interchangeably Absorption Is One Attenuation Component Absorption Is Energy Lost To Heat Attenuation In Architectural Acoustics Defined As
Sum Of Energy Lost To Heat & Transmission Attenuation In Underwater Sound Propagation
Defined As Sum Of Energy Lost To Heat & Scattering Units Often Used For Sound Propagation
= dB/nepers = m / 8.686 m = dB/m = / k = dB/km = 1000 m f = dB/kHz-m = 8.686 / f(kHz) = dB/ = 8.686
Einc Erefl Etran Escat Eabs
Transmitted
ir
c1
c21
2 t
Incident Reflected
Scattered
20 log e = 8.686
Jensen, et. al., Computational Ocean Acoustics
Jensen, et. al., Computational Ocean Acoustics
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Sound DiffractionSound Diffraction Described by Van Huygen’s Principle Of Elementary
Waves Interface Points Reached By Sound Wave Act As Secondary
Sources Appears As Waves Bending Around Corners Ray-Theory Can’t Account For Diffraction Gaussian Ray-Bundle Formulation Combines Rays & Waves To
Account For Diffraction At Higher Frequencies
Described by Van Huygen’s Principle Of Elementary Waves Interface Points Reached By Sound Wave Act As Secondary
Sources Appears As Waves Bending Around Corners Ray-Theory Can’t Account For Diffraction Gaussian Ray-Bundle Formulation Combines Rays & Waves To
Account For Diffraction At Higher Frequencies
http://www.pa.op.dlr.de/acoustics/essay1/beugung_en.html
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Sound & Waves JAVA AppletsSound & Waves JAVA Applets Oscillations and Waves
Ripple Tank (2-D Waves) Applet Ripple tank simulation that demonstrates wave motion, interference, diffraction, refraction, Doppler effect, etc.
2-D Waves Applet Demonstration of wave motion in 2-D.
3-D Waves Applet Demonstration of wave motion in 3-D.
Coupled Oscillations Applet Demonstration of longitudinal wave motion in oscillators connected by springs.
Dispersion Applet Dispersion and group velocity.
Acoustics Loaded String Applet
Simulation of wave motion of a string. Rectangular Membrane Waves Applet
Vibrational modes in a 2-d membrane. Circular Membrane Waves Applet
Vibrational modes in a 2-d circular membrane (drum head). Bar Waves Applet
Bending waves in a bar. Vowels Applet
The acoustics of speech. Box Modes Applet
Acoustic standing waves in a 3-d box. Acoustic Interference Applet
Generates audio interference between your speakers.
Oscillations and Waves Ripple Tank (2-D Waves) Applet
Ripple tank simulation that demonstrates wave motion, interference, diffraction, refraction, Doppler effect, etc. 2-D Waves Applet
Demonstration of wave motion in 2-D. 3-D Waves Applet
Demonstration of wave motion in 3-D. Coupled Oscillations Applet
Demonstration of longitudinal wave motion in oscillators connected by springs. Dispersion Applet
Dispersion and group velocity.
Acoustics Loaded String Applet
Simulation of wave motion of a string. Rectangular Membrane Waves Applet
Vibrational modes in a 2-d membrane. Circular Membrane Waves Applet
Vibrational modes in a 2-d circular membrane (drum head). Bar Waves Applet
Bending waves in a bar. Vowels Applet
The acoustics of speech. Box Modes Applet
Acoustic standing waves in a 3-d box. Acoustic Interference Applet
Generates audio interference between your speakers.
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Sound Speed Profile MeasurementSound Speed Profile Measurement
http://www.aoml.noaa.gov/goos/uot/xbt-what-is.php
XBT = Expendable BathythermographXCTD = Expendable Conductivity/Temperature and Depth
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Ocean Waveguide May Be Divided Into Continental Shelf, Slope, & Basin
Ocean Waveguide May Be Divided Into Continental Shelf, Slope, & Basin
Continental SlopeDeep Sea
(Blue Waters)Continental Shelf(Brown Waters)
Dw< 200 m
SoundVelocityProfile
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Sound Refraction Due To Variable SpeedSound Refraction Due To Variable Speed Sound Speed Variability Causes Refraction Depth Excess Required To Form Convergence Zones Shadow Zones Are Filled With Interface-Reflected Energy
Sound Speed Variability Causes Refraction Depth Excess Required To Form Convergence Zones Shadow Zones Are Filled With Interface-Reflected Energy
DepthExcess
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Monthly Variability In Brown WatersMonthly Variability In Brown Waters
Sound Speed Proportional To Temperature Sound Speed Proportional To Temperature
February
August
February August
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Transmission Loss Of Whale VocalizationTransmission Loss Of Whale Vocalization
North Pacific Blue Whale
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Gaussian Canyon: Nx2D vs. 3DGaussian Canyon: Nx2D vs. 3D
PE TL Along Canyon
F = 25 Hz, Ds = 30 m, Dr = 35 m,cb = 1700 m/s, = 1.5 gm/cc, = 0.1dB/
Arvelo & Rosenberg, JCA 9:17, 2001
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Active Sonar Detection Range EstimationActive Sonar Detection Range Estimation
Once Acceptable Values For Pd &PfaAre Determined, Associated RD Is Used With Computed SNR To Infer Max. Detection Range
SE = SNR – RD > 0 SNR > RD
Once Acceptable Values For Pd &PfaAre Determined, Associated RD Is Used With Computed SNR To Infer Max. Detection Range
SE = SNR – RD > 0 SNR > RD
RD
DetectionRange
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Figure-Of-Merit (FOM)Figure-Of-Merit (FOM)
Parameter Used To Estimate Detection Range From TL Curves
More Useful For Passive Than Active Sonars Due To Range-Dependence Of Interference
Passive FOM SE = FOM – TL > 0 FOM = SL-NL+AG+PG-RD TL < FOM
Active FOM SE = FOM – (TL1+TL2) > 0 FOM=SL-(NL+RL)+TS+AG+PG-RD FOM > TL1 + TL2
Parameter Used To Estimate Detection Range From TL Curves
More Useful For Passive Than Active Sonars Due To Range-Dependence Of Interference
Passive FOM SE = FOM – TL > 0 FOM = SL-NL+AG+PG-RD TL < FOM
Active FOM SE = FOM – (TL1+TL2) > 0 FOM=SL-(NL+RL)+TS+AG+PG-RD FOM > TL1 + TL2
http://www.fas.org/man/dod-101/navy/docs/fun/part08.htm
FOM
Cylindrical
Spherical
FOM
DetectionRange
DetectionRange
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Sonar Effects On Humans & Marine Mammals Must Also Be Assessed
Sonar Effects On Humans & Marine Mammals Must Also Be Assessed
Duration Per Day (hrs) Sound Level (dBA)OSHA NIOSH16 858 906 924 95 883 972 100
1.5 1021 105 94
0.5 110 970.25 115 1000.125 120
Marine Mammals Medium
Injury Criteria Behavioral ResponsePeak Pressure 24-hr Dosage Peak Pressure 24-hr Dosage
Cetaceans Water 230 dB//1uPa 198 dB//1uPa2-s 224 dB//1uPa 183 dB//1uPa2-sPinnipeds Water 218 dB//1uPa 186 dB//1uPa2-s 212 dB//1uPa 171 dB//1uPa2-sPinnipeds Air 149 dB//20uPa 144 dB//20uPa2-s 109 dB//20uPa 100 dB//20uPa2-s
Careful With The Units! Don’t Compare Apples & Oranges!
Human Exposure Is Broadband A-Weighted (Ear Response)
Southall, et. al., “Marine Mammal Noise Exposure Criteria: Initial Scientific Recommendations,” Aquatic Mammals, 33(4), 2007
Southall, et. al., “Marine Mammal Noise Exposure Criteria: Initial Scientific Recommendations,” Aquatic Mammals, 33(4), 2007
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Oceanographic & Atmospheric Master Library (OAML) Propagation Models
Oceanographic & Atmospheric Master Library (OAML) Propagation Models
ASTRAL 5.1 Range-Dependent Range-Averaged TL 20 Hz – 4 kHz
Colossus II 1.1 Range-Independent & Semi-Empirical Shallow Waters (
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OAML Environmental DatabasesOAML Environmental Databases
GDEM-V 3.0 Generalized Digital Env. Model Variable Resolution
DBDB-V 5.3 Digital Bathymetric Data Base Variable Resolution
LFBL 11.1 Low-Frequency Bottom Loss (F < 1 kHz)
HFBL 2.2 High-Frequency Bottom Loss (F = 3.5 kHz)
BST 2.0 Bottom Sediment Type (F > 10 kHz)
VSS 6.3 Volume Scattering Strength
GDEM-V 3.0 Generalized Digital Env. Model Variable Resolution
DBDB-V 5.3 Digital Bathymetric Data Base Variable Resolution
LFBL 11.1 Low-Frequency Bottom Loss (F < 1 kHz)
HFBL 2.2 High-Frequency Bottom Loss (F = 3.5 kHz)
BST 2.0 Bottom Sediment Type (F > 10 kHz)
VSS 6.3 Volume Scattering Strength
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OAML Noise Models & DatabasesOAML Noise Models & Databases Models
ANDES Ambient Noise Directional Estimation System Used Only To Generate Static Shipping Noise (SN)
DANM 1.1 Dynamic Ambient Noise Model Plans To Use For Shipping Noise Database Upgrade Incorporated HITS Vessel Motion Simulation (HVMS)
Databases Shipping Noise (SN) 5.4
Generated With ANDES Historical Temporal Shipping (HITS) 4.1
Yields Shipping Density For Fishing Boats, Merchant Ships, Tankers, Large Tankers & Supertankers
Wind & Residual Noise (WRN) 3.0 Surface Marine Gridded Climatology (SMGC) 2.0
Models ANDES
Ambient Noise Directional Estimation System Used Only To Generate Static Shipping Noise (SN)
DANM 1.1 Dynamic Ambient Noise Model Plans To Use For Shipping Noise Database Upgrade Incorporated HITS Vessel Motion Simulation (HVMS)
Databases Shipping Noise (SN) 5.4
Generated With ANDES Historical Temporal Shipping (HITS) 4.1
Yields Shipping Density For Fishing Boats, Merchant Ships, Tankers, Large Tankers & Supertankers
Wind & Residual Noise (WRN) 3.0 Surface Marine Gridded Climatology (SMGC) 2.0
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OAML & Other Sonar ModelsOAML & Other Sonar Models
OAML Sonar Models ASPM 6.1.2
Acoustic System Performance Model CASS 4.1
Comprehensive Acoustic Simulation System Gaussian Ray Bundle (GRAB) Propagation Model
Other Sonar Models NSWC (PC-IMAT, PC-SWAT, …) NRL (BiRASP, BiKr, …) APLUW (SST) JHUAPL (APL-Sonar, HFPSM, HFASM, ARAMIS, …) Adaptive Methods (GAMUT)
OAML Sonar Models ASPM 6.1.2
Acoustic System Performance Model CASS 4.1
Comprehensive Acoustic Simulation System Gaussian Ray Bundle (GRAB) Propagation Model
Other Sonar Models NSWC (PC-IMAT, PC-SWAT, …) NRL (BiRASP, BiKr, …) APLUW (SST) JHUAPL (APL-Sonar, HFPSM, HFASM, ARAMIS, …) Adaptive Methods (GAMUT)
OAML POCWalter Moskal(228) 688-5160
OAML POCWalter Moskal(228) 688-5160
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Sonar Performance Prediction Model For Mobile Devices In Process…
Sonar Performance Prediction Model For Mobile Devices In Process…
http://www.faberacoustical.com/products/iphone/
SignalScope SoundMeter SignalSuite
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