Browsing AE Research Publications by Subject "Acoustic impedance"

Now showing items 1-3 of 3

    • 3D printed multifunctional low-frequency sound absorbers 

      Johnston, William; Kankanamalage, Pulitha G.; Sharma, Bhisham N. (Institute of Noise Control Engineering, 2021-08-01)
      Cellular porous materials are an attractive choice for lightweight structural design. However, though their open porous architecture is ideally suited for multifunctional applications, their use is typically limited by the ...

    • Acoustic absorption properties of granular silica aerogels 

      Dasyam, Amrutha; Khaleel, Ola; Sharma, Bhisham N. (Institute of Noise Control Engineering, 2020-10-12)
      Aerogels are a class of synthetic materials derived using supercritical drying to extract the liquid component of a gel and replacing it with a gas. This process results in the formation of an ultra-lightweight nanoporous ...

    • A comparison of the two and four microphone methods for deriving the characteristic acoustic properties of porous materials 

      Lomte, Amulya; Wojciechowski, Brittany; Sharma, Bhisham N. (Institute of Noise Control Engineering, 2020-10-12)
      The characteristic acoustic impedance and wave number of a porous material can be derived using either a two microphone or a four microphone impedance tube setup. For the four microphone method, these complex properties ...