NOISE BARRIER AND APPARATUS COMPRISING THE NOISE BARRIER
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United States of America Patent
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Issued Date -
Aug 24, 2023
app pub date -
Jul 16, 2021
filing date -
Jul 17, 2020
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Abstract
A noise barrier is adapted for use in an apparatus which produces noise during operation and which includes at least one blower for generating an airflow along a path through the apparatus. The noise barrier has one or more through holes and is configured to be placed in the path of the airflow for attenuating sound which propagates along the path in the airflow. The noise barrier 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.
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