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SoUnd EmISSIonS
Acoustic emissions
noise, a sound or a tone are all
described as sound. sound spreads by
the transfer of kinetic energy from one
molecule to another.
A sound carrier medium is always
required for sound transmission (air,
water, iron etc.). From a physical
aspect, sound takes the form of a
wave that expands in circular form.
the movement of sound waves can be
compared to that of water waves.
Reflection
where sound waves hit a wall the
waves are reflected at the same angle
as that of the impact.
Absorption
if sound waves impact on a soft,
porous wall, some of the sound
energy is converted to frictional heat.
Law of Distance
the sound pressure level is reduced by
approx. 6 db(A) if distance l doubles
in length.
Law of Distance using the WPL 10 as
an example
sound power level
lwA = 65 db(A)
sound pressure level
lpA1 (5 m distance) = 43 db(A)
sound pressure level
lpA2 (10 m distance) = 37 db(A)
Sound power level
the sound power level describes
the sound emissions from a source
or sound. it is determined using the
sound pressure level, relative to the
envelope area of the source of sound,
i.e. the so-called envelope method.
Sound pressure level
the sound pressure level, measured in
the ambience, is subject to the sound
power level, the distance at which the
level is measured and the structural
surroundings.
Human perception
if a sound is perceived to be twice as
loud, this corresponds to a rise by 10
db(A).
two sources of sound of the same volume
correspond to a rise of 3 to 6 db(A).
Sound propagation
Sound propagation
Distance
from the
source of
sound to the
perceiving
person
reduced sound pressure level from the sound power level subject to the
distance and the installation conditions
1 m
8.0 db(A)
5.0 db(A)
2.0 db(A)
2 m
14.0 db(A)
11.0 db(A)
8.0 db(A)
3 m
17.0 db(A)
15.0 db(A)
12.0 db(A)
4 m
20.0 db(A)
17.0 db(A)
14.0 db(A)
5 m
22.0 db(A)
19.0 db(A)
16.0 db(A)
7 m
25.0 db(A)
22.0 db(A)
19.0 db(A)
10 m
28.0 db(A)
25.0 db(A)
22.0 db(A)
15 m
32.0 db(A)
29.0 db(A)
26.0 db(A)
20 m
34.0 db(A)
31.0 db(A)
28.0 db(A)
Law of Distance
the sound pressure level is reduced by
approx. 6 db(A) if distance l doubles in
length.
Law of Distance using the WPL 10 as an example
sound power level l
w
A
= 65 db(A)
sound pressure level l
P
A
1
(5 m distance) = 43 db(A)
sound pressure level l
P
A
2
(10m distance) = 37 db(A)
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