Numerical Analysis on Vibro-Acoustic Characterization of Honeycomb Structure with Flow Permeability

Tee, Zhen Wei (2019) Numerical Analysis on Vibro-Acoustic Characterization of Honeycomb Structure with Flow Permeability. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Various noise attenuating designs which allowed the exchange of air had been proposed by several authors. However, the designs were often bulky or required the use of additional complex software or hardware. Hence, there existed a need for the development of a lightweight noise attenuating structure with flow permeability. Among various lightweight structure, honeycomb structure was one of the most commonly used structures in the industries with wide application due to its high strength to weight ratio and was therefore chosen to be the scope of this research. Hence, the research conducted numerical simulations to analyse the vibro-acoustic properties of honeycomb structure with flow permeability at low to medium frequency range (50–3000 Hz) using ANSYS software. A honeycomb sandwich panel with perforated facing was designed to allow the transfer of air and the numerical model had been developed for vibro-acoustic analysis, flow analysis as well as structural analysis. Two different hybrid panel design with U-shaped and V-shaped corrugation in honeycomb core were proposed and was found to exhibit superior sound transmission loss (STL) as well as excellent mechanical stiffness and strength without significantly affecting the flow performance. It was found that in the frequency range of 50– 3000 Hz, the unweighted average STL of the U-shaped corrugation honeycomb hybrid panel (UCHP) and V-shaped corrugation honeycomb hybrid panel (VCHP) was 19 dB and 25 dB higher than the honeycomb panel respectively with negligible effect on the flow performance of the honeycomb panel. The proposed hybrid panel showed promising noise attenuation applications, which involved fluid flows such as in motors and compressors, especially when lightweight noise attenuating structure was required.