A Modal Study of Damping Treatments to Improve Low Frequency Sound Transmission Loss of a Structure

Paper #:
  • 2017-01-1852

Published:
  • 2017-06-05
Abstract:
Most of NVH related issues start from the vibration of structures where often the vibrations at resonance radiates the energy in terms of sound. This phenomenon is more pragmatic at low frequencies. This paper discusses a case study where different viscoelastic materials were evaluated on a bench study and then carried on to system level evaluation. A steel panel with a glazing system was used to study both airborne and structureborne noise radiation. System level studies were carried out using experimental modal analysis to shift and tune the mode shapes of the structure using visco-elastic materials with appropriate damping properties to increase the sound transmission loss. The paper discusses the findings of the study where the mode shapes of the panel were shifted and resulted in an increase in sound transmission loss and eventually resulted in reduced sound level in the cabin interior.
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