Numerical Simulation Of The Laboratory Sound
Insulation Determination Experiments
Author(s)
A. Pietrzyk
Abstract
This paper explores numerical simulations for the experimental evaluation of
sound reduction index for building partitions in the low frequency range,
i.e. the range in which the modal density is low in typical rooms. The
simulations are based on the wave theoretical model of acoustic cavities, which
is reviewed first. The governing (damped) wave equation is solved
approximately by the Modal Approach and by the Finite Element Method.
Absorption in rooms is modeled by introducing the flow resistivity, related to
the reverberation time, which in turn is measured during the experiment. Two
models are employed for the partition. In the first the partition is treated as
locally reacting with mass impedance. In the second it is treated as a thic
Keywords
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