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Noise Pollution Chapter 16. What’s the difference between a sound and a noise? (Intro & Section 16.3). Pressure Waves (Section 16.1). Source. Sound Pressure Level. SPL = 10 log (P 2 /P o 2 ) P o = 0.00002 Pa Units: dB. Typical SPLs.

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sound pressure level
Sound Pressure Level

SPL = 10 log (P2/Po2)

Po = 0.00002 Pa

Units: dB

typical spls
Typical SPLs

Measurements by Gordon Hempton, “an acoustic ecologist and sound recordist”

changes in sound energy
Changes in Sound Energy

Decibel Addition

For n sources of the same dB:

SPLTotal = 10 log n + SPLo

in class activity
In-Class Activity

Your company is purchasing an additional piece of manufacturing equipment. You have two choices. One brand generates 91 dB(A); another brand costs 10% more but generates 88 dB(A). You determine that the current level of noise in the production area is 88 dB(A). The workers are on 8-hour shifts. The OSHA 8-hour noise limit for the area is 93 dB(A). The company has been doing well and has thoughts of expanding production at this location in the near future. Determine which piece of equipment to purchase.

effect of distance
Effect of Distance

Point Source

Line Source

effect of distance1
Effect of Distance
  • Point source:  SPL = 20 log (D/Do) 6 dB/DD
  • Line source:  SPL = 10 log (D/Do) 3 dB/DD
  • Hard site:  SPL = 10 log (D/Do) 3 dB/DD
  • Soft site:  SPL = 15 log (D/Do) 4.5 dB/DD
calculating spl
Calculating SPL

SPL average from a frequency analysis

N = number of measurements taken

other issues section 16 2

Leq

SPL

Time

Other Issues(Section 16.2)

Time Varying SPL

noise abatement and control
Noise Abatement and Control

What are some options for abating or controlling traffic noise?

some info about noise barriers
Some Info about Noise Barriers
  • How effective are they?
  • When are they considered?
  • When are they installed?
  • Of what are they constructed?
metal
Metal

1985

1984

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