DETERMINATION OF SILENCER DYNAMIC INSERTION LOSS (DIL)
To determine the necessary dynamic insertion loss (DIL) of any silencer, it is
necessary to calculate the permissible sound power level LW at the silencer outlet.
This factor is derived from the permissible noise pressure level at the reference
point (Lr, see Section 1.1), the adjustment factor for the distance to the noise
source (∆Lr, see Section 1.2) and the sum of the transmission factors (Σ(∆LTF) =
∆La, + ∆LΦ, + ∆Lrx + ∆Ls + ∆Lv + ∆Lb; see Section 1.3) according to