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Building a Modified Impedance Tube for Measurement of Sound Transmission Loss and Abosrption Coefficients of Polymer Cross-linked Aerogel Core Composites

Vengala, Kalyan Chakravarthy
This work describes in detail the development of the conventional impedance tube and also the modification made to determine the sound transmission loss. Concepts of engineering acoustics have been used for deriving the equations used for the calculation of the above said acoustic properties. The performance of the tube was determined by performing experiments on materials for which acoustic properties are known and also by using an approximately ideally sound absorbing material. An impedance tube is developed such that it can evaluate the sound-insulation properties viz., sound transmission loss and absorption coefficient of a given material, upon a slight modification.