Tailoring the Acoustic Properties of Truss-Core Sandwich Structure

• Main Author: Lee, Richard
• Other Authors: Steeves, Craig A.
• Language: en_ca
• Published: 2012
• Subjects: acoustics; Truss-Core Sandwich; composite; multifunctional; cabin noise; 0538
• Online Access: http://hdl.handle.net/1807/33284

Undesirable cabin noise has an adverse physiological effect on passengers and crews in an aircraft. In order to reduce the noise level, a passive approach using a truss-core sandwich (TCS) panel as a sound insulator is proposed. Design guidelines and analysis methodologies were developed in order to explore the vibro-acoustic characteristics of TCS structure. Its sound isolation properties can be thereby assessed. Theoretical analyses show that the transmission-loss and sound radiation properties of a TCS structure can be represented by the root-mean-square velocity of its surface, and a beam structure analysis is sufficient to reveal many of the important aspects of TCS panel design. Using finite element analysis, a sensitivity study was performed to create design guidelines for TCS structures. Transmission-loss experiments show that the analytical and numerical analyses correctly predict the trend of TCS structure’s vibro-acoustic performance.