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Acoustic liners

An acoustic liner
An acoustic liner
Acoustic liners are used to absorb sound for many engineering applications ranging from concert halls to aircraft engines. The most common acoustic liner consists of a single layer honeycomb and perforate facing sheet (see figure above).  Theoretical predictions show that there is an optimum setting for the geometric parameters for which all the incident sound field can be absorbed. Such a linear would be extremely useful. The objective of this project is to investigate experimentally if such a liner is practical.  We will also consider new liner designs and study their effectiveness in absorbing sound. We will develop simple theoretical models to explain the observations.
Relevant IIB module: 4A15 (Aeroacoustics)
Acoustic liner on a Trent 1000
Intake with acoustic liners (Rolls-Royce Trent 1000 engine on Boeing 787)