Sponsored Links
The Environmental Protection Agency - EPA - has adopted a system of four "sound descriptors"
to summarize how sound is heard and measured, and to determine the impact of noise on health and welfare.
quantifies the noise environment as a single value of sound level for any desired duration. This descriptor correlates well with the effects of noise on people. Leq is also sometimes known as Average Sound Level - LAT.
Equivalent Sound Level - Leq - can be expressed as
Leq = 10 log [(1/T) ∫ pA2 dt/pref2] (1)
where
Leq = equivalent sound level (db)
T = time period (s)
pA = sound pressure (Pa, N/m2)
pref = reference sound pressure ( 20 10-6 Pa, N/m2)
Sponsored Links
Sponsored Links
Engineering ToolBox - SketchUp Edition - enabled for use with the amazing, fun and free Google SketchUp.
© The Engineering ToolBox 2005
9 12 8