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Noise Assessment

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Noise Assessment & Prediction System. At Aberdeen Test Center. by Charles Clough. 24 April 2001 ... Developed by University of Dayton Research Institute (Dr. ... – PowerPoint PPT presentation

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Title: Noise Assessment


1
Noise Assessment Prediction System At Aberdeen
Test Center
by Charles Clough
24 April 2001
2
PROPAGATION MEDIUM
LOWER ATMOSPHERIC BOUNDARY LAYER
Receptor Response
Blast Energy
S (x,y,z,t) f (? Tv , WS? )
3
BOUNDARY-LAYER METEOROLOGY
  • Virtual Temperature Gradient

Wind Vector Gradient
4
NOISE ASSESSMENT PREDICTION SYSTEM
  • Ray-Trace Model
  • Developed by University of Dayton Research
    Institute (Dr. James Luers Project Manager
  • One-Dimensional characterization of the
    atmosphere (vertical gradients only)
  • Two-Dimensional characterization of the terrain
    (includes elevation, land and water impedance's)
  • 80-85 effective in specifying sectors of
    acoustic focusing over the past 10 years of
    operation

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8
IMPROVEMENT PROGRAM
  • Added More Blast Sites
  • Added Ensemble Computation Capability

1996
  • Added More Blast Sites
  • Added Prediction Uncertainty Capability

1999
2000 ?
  • Development of Pre-Ensemble Data Algorithm
  • Sensitivity Research to Link with 4DWX Model
    Output

9
NEED
  • PREDICTION OF TEMPERATURE AND WIND GRADIENTS
    THROUGHOUT THE APG AREA 12-24 HOURS AHEAD

ANSWER
"4DWX" PROJECT
  • Nonprofit consortium of 61 universities with
    doctoral programs in
  • the atmospheric and oceanic sciences.
  • Supported by the National Science Foundation

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11
115 dBP Forescast for 28Mar00 1500L (Morning
Estimate 1045 hrs) as of 28Mar00 w/125 dBP in
red
12
115 dBP Forescast for 28Mar00 1500L as of 28Mar00
w/125 dBP in red
13
4DWX Enhancements at ATC
  • Hourly forecast mode (initialization at 0700hrs
    and 1900hrs daily)
  • To 1900hrs (available at 0700hrs)
  • To 1900hrs next day (available at 1530)
  • Post-test analytical mode (FDDA)
  • Ingestion of all local measurements
  • Mathematical/Physical integration with 3-D fields
    for each hour

14
4DWX Enhancements at ATC (contd)
  • Real-Time FDDA
  • FDDA up to t-1 hour
  • Forecast from FDDA out to 6 hours
  • Test can adapt to weather on-the-fly

15
4DWX Enhancements at ATC (contd)
RT-FDDA ingests data points irregularly located
in space and time into the 3-D field of variables
to produce a dynamically-balanced data-set.
16
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