advanced acoustical modeling tools for esme martin siderius and michael porter science applications...
TRANSCRIPT
![Page 1: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/1.jpg)
Advanced Acoustical Modeling Tools for ESME
Martin Siderius and Michael Porter Science Applications Int. Corp.
10260 Campus Point Dr., San Diego, CA [email protected]
![Page 2: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/2.jpg)
Acoustic Modeling Goals
Through modeling, try to duplicate sounds heard by marine mammals (e.g. SONAR, shipping)
Develop both high fidelity and very efficient simulation tools
![Page 3: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/3.jpg)
Acoustic Modeling Goals• Accurate field predictions in 3 dimensions• Computational efficiency (i.e. fast run times)• Propagation ranges up to 200 km• R-D bathymetry/SSP/seabed with depths 0-5000 m• Frequency band 0-10 kHz (or higher)• Moving receiver platform• Arbitrary waveforms (broadband time-series)• Directional sources
Difficult task for any single propagation code
Approach is to use PE, Rays and Normal Modes
![Page 4: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/4.jpg)
Model Comparisons
Frequency
Com
puta
tion
Tim
e
Rays
NM and PE
Frequency
Acc
urac
yRays
NM and PE
![Page 5: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/5.jpg)
Motivation
![Page 6: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/6.jpg)
Fast Coupled NM Method
• Range dependent environment is treated as series of range independent sectors
• Each sector has a set of normal modes• Modes are projected between sectors allowing for
transfer of energy between modes (matrix multiply)• Algorithm marches through sectors • Speeds up in flat bathymetry areas• Pre-calculation of modes allows for gains in run-
time (important for 3D calculation)• Very fast at lower frequencies and shallow water
![Page 7: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/7.jpg)
Mid Atlantic Bight: Example
![Page 8: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/8.jpg)
![Page 9: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/9.jpg)
Mammal Risk Mitigation Map
SD = 50 m
SL = 230 dB
Freq = 400 Hz
Lat = 49.0o N
Long = 61.0o W
5 dB more loss5 dB less loss
![Page 10: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/10.jpg)
Shipping Simulator
• Using the fast coupled normal-mode routine shipping noise can be simulated
• This approach can rapidly produce snapshots of acoustic data (quasi-static approximation)
• Self noise can also be simulated (i.e. on a towed array)
• Together with a wind noise model this can predict the background ambient noise level
![Page 11: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/11.jpg)
Example: Simulated BTR• Input environment, array geometry (e.g. towed
array hydrophone positions) and specify ship tracks (SL, ranges, bearings, time)
![Page 12: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/12.jpg)
Example: BTR from SWELLEX96
![Page 13: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/13.jpg)
Computing Time-Series Data for Moving Receiver
1. How is the impulse response interpolated between grid points?
2. How are these responses “stitched” together?
![Page 14: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/14.jpg)
1. Interpolating the Impulse Response
• In most cases the broad band impulse response cannot be simply interpolated
• For example, take responses from 2 points at slightly different ranges:
![Page 15: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/15.jpg)
2. “Stitching” the Responses Together
• Even if the impulse response is calculated on a fine grid, there can be glitches in the time-series data (due to discrete grid points)
• For example, take the received time-series data at points 1 m apart:
![Page 16: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/16.jpg)
Solution: Interpolate in Arrival Space
• The arrival amplitudes and delays can be computed on a very course grid and since these are well behaved, they can be interpolated for positions in between.
• Using the “exact” arrival amplitudes and delays at each point, the convolution with the source function is always smooth.
![Page 17: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/17.jpg)
Ray/Beam Arrival Interpolation
Endpoint #1
Endpoint #2
Interpolated
j
ttij
jeAzrp )(),,( Advantage: very fast and broadband
![Page 18: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/18.jpg)
Test Case: Determine Long Time Series Over RD Track
• Source frequency is 3500 Hz
• Source depth is 7 m
• Environment taken from ESME test case
• Receiver depth is 7-100 m
• Receiver is moving at 5 knots
![Page 19: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/19.jpg)
TL
![Page 20: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/20.jpg)
Received Time-Series
![Page 21: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/21.jpg)
Received Time-Series
![Page 22: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/22.jpg)
Received Time-Series (with Source Functions)
![Page 23: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/23.jpg)
Computing TL Variance
• Fast Coupled Mode approach allows for:– TL computations in 3D (rapid enough to
compute for several environments)– Changing source/receiver geometry
• Ray arrivals interpolation allows for Monte-Carlo simulations of TL over thousands of bottom types to arrive at TL variance
![Page 24: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/24.jpg)
Ray/Beam Arrival Interpolation
Endpoint #1
Endpoint #2
Interpolated
j
ttij
jeAzrp )(),,( Advantage: very fast and broadband
![Page 25: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/25.jpg)
Does it work? TL example
• 100-m shallow water test case:– Source depth 40-m– Receiver depth 40-m– Downward refracting sound speed profile– 350 Hz
• 3 parameters with uncertainty:– Sediment sound speed 1525-1625 m/s– Sediment attenuation 0.2-0.7 dB/– Water depth 99-101 m
![Page 26: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/26.jpg)
Does it work? TL example
Interpolated (red) is about 100X faster than calculated (black)
![Page 27: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/27.jpg)
TL Variance
![Page 28: Advanced Acoustical Modeling Tools for ESME Martin Siderius and Michael Porter Science Applications Int. Corp. 10260 Campus Point Dr., San Diego, CA sideriust@saic.com](https://reader035.vdocuments.net/reader035/viewer/2022062511/5513d95f55034674748b50bd/html5/thumbnails/28.jpg)
TL Variance