Coefficient Of Local Pressure Loss; Noise Data - Mandik alnor FDMD Manual

6.2. Determination of pressure loss by using diagram 6.2.1.
Diagram 6.2.1. Pressure losses for air density

7. Coefficient of local pressure loss

7.1. Coefficient of local pressure loss
Tab. 7.1.1. Coefficient of local pressure loss
D 100
2,736

8. Noise data

8.1. Level of acoustic output corrected with filter A.
L = L
WA
L
[dB(A)] level of acoustic output corrected with filter A
WA
L [dB]
W1
2
S [m ]
K [dB]
A
8.2. Level of acoustic output in octave ranges.
L
Woct
L
[dB]
Woct
L [dB]
W1
S [m
L
[dB]
rel
=1,2 kg.m
(-)
125 140
2,099 1,781
+ 10 log(S) + K
W1 A
level of acoustic output L
effective area of the damper
correction to the weight filter A (see Tab. 8.3.2.)
= L + 10 log(S) + L
W1 rel
spectrum of acoustic output in octave range
level of acoustic output L
2
] effective area of the damper
relative level expressing the shape of the spectrum (see Tab. 8.3.3.)
= 1,2 kg.m
-3
150 160
1,527 1,272
2
related to the 1 m section (see Tab. 8.3.1.)
W1
2
related to the 1 m section (see Tab. 8.3.1.)
W1
13
TPM 092/13
-3
180 200
0,929 0,636