This research is about to address a main challenge related to newly emerging airplane engines, namely open rotor (propfan). Though these engines show high efficiency, yet the noise generated is very high. This research focuses on developing a new class of ‘Acoustic Metamaterial’ to overcome the noise reaches the passenger cabin. Acoustic metamaterial is a complex composite structured materials that exhibit negative density and negative bulk modulus either individually or simultaneously. It can be engineered to exhibit many  desired electromagnetic, acoustic or mechanical effective properties. The objective of this research is to design, develop and operate an acoustic fuselage using a combination of n(NDAM) and (NBAM) to reduce the noise transmission into the passenger cabin. Furthermore, the developed Acoustic metamaterial structure can be used for pressure sensing application. Based on the literature reviews, experiments pertaining to combination of NBAM and NDAM are limited. Hence, an integration of both structures is very appealing to be developed. Accordingly, the research will fabricate a combination of two types of Helmholtz resonators (Conventional with one inner membrane and two inner membranes) of negative bulk modulus acoustic metamaterial. The fabricated filter will be embedded in a sandwich structure to obtain a new type of cabin wall. The new structure will be used to test and validate the proposed design for noise reduction and pressure sensing. Hence the design and development of such acoustic metamaterial is expected to reduce the noise inside the cabin to the minimum. Also the developed structure will be able to give pressure values at selected locations inside the cabin.


Design and Development of Acoustic Metamaterials for Cabin Noise Reduction and Pressure Sensing in Propfan Aircrafts

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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