#2001055
Bíonn an coigeartú fuaimchoiscis níos lú ná cúpla deichiú de dB amháin de ghnáth.
The acoustic impedance adjustment is usually less than a few tenths of one dB.
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#2001043
Sula gcuirfear an modh idirshuite/eachtarshuite ar tugadh tuairisc air cheana i bhfeidhm, cuirfear coigeartú fuaimchoiscis i bhfeidhm maidir leis na gnáthshonraí NPD sin.
Before applying the interpolation/extrapolation method previously described, an acoustic impedance adjustment shall be applied to these standard NPD data.
#2001044
Baineann fuaimchoisceas le hiomadú fuaimthonnta i meán fuaime, agus sainítear é mar tháirgeadh an dlúis aeir agus an luais fuaime.
Acoustic impedance is related to the propagation of sound waves in an acoustic medium, and is defined as the product of the density of air and the speed of sound.
#2001051
Fuaimchoisceas (niútan • soicind/m3) an aeir ag airde an aeradróim (agus 409.81 an coisceas aeir a ghabhann le dálaí tagartha atmaisféir na sonraí NPD sa bhunachar sonraí ANP).
Acoustic impedance (newton seconds/m3) of the air at the aerodrome elevation (409,81 being the air impedance associated to the reference atmospheric conditions of the NPD data in the ANP database).
#2001045
Le haghaidh fuaimdhéine ar leith (cumhacht in aghaidh an achair aonaid) a bhraitear ag fad sonrach ón bhfoinse, braitheann an fuaimbhrú lena mbaineann (a úsáidtear chun méadracht SEL agus LAmax a shainiú) ar fhuaimchoisceas an aeir ag suíomh an tomhais.
For a given sound intensity (power per unit area) perceived at a specific distance from the source, the associated sound pressure (used to define SEL and LAmax metrics) depends on the acoustic impedance of the air at the measurement location.