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1
Public Hearings on
Noise Abatement and Control
We developed what is today's basic method of measuring aircraft noise — the
perceived noise decibel ; we set maximum permissible noise levels for takeoffs,
which is 112 perceived noise decibels at a point in the community nearest to the
...
United States. Office of Noise Abatement and Control, 1972
2
Technology and economics of
noise control; National programs ...
And so in this case I will speak for myself and let Mr. Russell speak for himself. I
personally feel that the effective-perceived-noise-decibel type of definition of
noise has some very serious shortcomings. However, it is the best thing that we
have ...
United States. Office of Noise Abatement and Control, 1972
3
Aerodynamic
Noise: An Introduction for Physicists and Engineers
Thus was developed a new unit, the perceived noise decibel (PNdB), which is
identical to the A-weighting method, defined such that the PNdB rating of a
complex sound should approximate the decibel rating of a 1,000-Hz octave band.
4
MECHANICAL VIBRATIONS AND
NOISE ENGINEERING
This similarity also holds between perceived noise decibel (PNdB) noisiness and
phon in loudness. Thus, just as 40 phons equal one sone, 40 PNdB equals one
noy. Also, just as 50 phons equal 2 sones, 50 PNdB equals 2 noys.
5
Ethics and Mental Health: The Patient, Profession and Community
... which is given the unit of perceived noise decibel (PNdB), is the counterpart of
the loudness level in phons. Thus, where 40 phons = 1 sone, 40 PNdB = 1 noy. A
doubling of noisiness to 2noys= 50 PNdB, etc. PNL may be applied directly to ...
Michael Robertson, Garry Walter, 2013
The perceived noise decibel (PNdB) takes into account the responses of the ear,
while the effective perceived noise decibel (EPNdB) also considers duration and
gives extra weight to particularly objectionable sounds. Noise limits at Heathrow
...
7
Gas Turbines: A Handbook of Air, Land and Sea Applications
The unit that is commonly used to express noise annoyance is the Effective
Perceived Noise deciBel (EPNdB). It takes into *Source: Courtesy Rolls Royce.
Adapted, with permission. The Jet Engine, 1986, Rolls Royce Plc: UK. account
the ...
8
Acoustics and
Noise Control
... and is used for remote calibration emission a measure of sound energy
produced by a source of sound and radiated into the environment (see also
immisssion) EPNdB (effective perceived noise decibel) a metric used
internationally in the ...
9
Official docket for proposed revision to rail carrier
noise ...
The designation PNdB is deprecated for any use, whether to mean perceived
noise level or a nonexistent ' perceived noise decibel. The decibel itself is never
weighted. The symbol dB is a'unit symbol, and is neither a quantity symbol nor an
...
United States. Office of Noise Abatement Control, 1980
10
Academic Press Dictionary of Science and Technology
per capita daily intake Nutrition, the daily consumption of nutrients per person;
used as a statistical base for analyzing trends in human diets. perceive
Physiology, to be aware of through the senses; sense. perceived noise decibel
Acoustics, ...
Christopher G. Morris, 1992
