Session: 01-08-01: Passive, Semi-Active, and Active Noise and Vibration Control

Paper Number: 145224

145224 - Enhancing Sound Absorption of Curvature Damped Membrane With Heterogenous Microperforated Panel 

Integrating a membrane layer atop microperforated panels (MPP) prevents the dust accumulation within the pores, thus preserving their acoustic performance. The induced tension and curvature induced damping of the membrane on the fixed rim effect the sound absorption. The sound absorption caused by the MPP mostly results from thermal and viscous losses occurring in an array of micrometer-sized holes. The objective of this study is to develop a multilayer sound absorber with the damped membrane coupled with a heterogenous microperforated panels using the two-point impedance with graph theory-based approach. Further, the effect of the influencing parameters of the membrane i.e., Tension, surface density, damping coefficient of the membrane, and, hole diameter, thickness, and perforation porosity of the MPP is studied. The parametric studies showed how to select the design for a particular frequency to target. The findings demonstrated that the inclusion of the membrane significantly improved the acoustic characteristics. The presence of air cavities between the membrane and MPP, as well as between MPP and the rigid wall, determines the extent to which the sound absorption peak is shifted.

Presenting Author: Raja Kumar Indian Institute of Technology Kharagpur

Presenting Author Biography: Raja Kumar is currently a Ph.D. research scholar at the Acoustics and Condition Monitoring Lab, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, India under the supervision of Professor Amiya Ranjan Mohanty. He did his Bachelor in Mechanical Engineering from 2011-15 from the Government School of Engineering, Ernakulam, India. He further pursued his Masters in Machine Design in 2017–19 from the National Institute of Technology, Agartala, India. His area of expertise is passive and active noise control.

Authors:

Raja Kumar Indian Institute of Technology Kharagpur
Amiya Ranjan Mohanty Indian Institute of Technology Kharagpur