Study of passive control of sounds by Micro-Perforated Plates

The objective of this study is to understand the responsible physical mechanism leading to sound attenuation in Micro-Perforated Panels. The method is to utilize experimentally verified numerical models for different plate parameters such as porosity, thickness and perforation size.

PhD Student: Muttalip Aşkın Temiz
Supervisor: prof. dr. ir. Ines Lopez Arteaga
Project Funding: European Union
Project Period: October 2013 - January 2017

Please note that, this title is the name of the task within the project. The whole project is names as TANGO (Thermo-acoustic and Aero-acoustic Non-Linearities in Green Combustors with Orifice Structures). This is a Marie Curie Project.

A Micro-Perforated Plate (MPP) is a plate with holes whose porosity is in the order of 1% and the perforation diameter is designed specifically to attenuate incident sound waves using viscous losses within the perforations. This concept has been known for about 40 years and used in especially architecture, yet the governing physics is not fully understood. Also, recent studies show that the geometry of the perforation has a very large effect on the amount of sound energy absorbed.

At the end of this study, the sound absorption mechanism of MPP will be understood better. This will bring the possibility to use them in various engineering applications such as thermoacoustic and aeroacoustic systems. To achieve this goal, the first step is modeling MPP numerically. Secondly, these models should be verified by experiments. Final step is to conduct numerous numerical experiments in order to study the physical events in the vicinity of MPP.

Once this systematic study is done for various perforation geometries, the effect of vibration can be introduced to model very thin plates.