NOISE BARRIER AND APPARATUS COMPRISING THE NOISE BARRIER

摘要

The noise barrier (1) is arranged to be used in an apparatus which produces noise during operation and which comprises at least one blower (7) for generating an airflow (6) along a path through the apparatus. The noise barrier (1) has one or more through holes (2) and is configured to be placed in the path of the airflow (6) for attenuating sound which propagates along this path in the airflow. It is made of at least one sound attenuating polymeric foam, in particular a polyurethane foam. In order to achieve better sound attenuating properties the polymeric foam of the noise barrier has an airflow resistivity, measured in accordance with ISO 9053-1:2018, Part 1, which is higher than 50 000 Ns/m4. Moreover, the dynamic Young's modulus of the polymeric foam is preferably smaller than 250 kPa.