The Effect of Material Selection of Honeycomb Structures on Noise Reduction of Airplane Engines

Abstract

Honeycomb structures are widely used in modern aircraft engines due to their exceptional strength-to-weight ratio, durability, and acoustic performance. This paper examines how material selection: specifically, aluminum, Nomex, and carbon fiber reinforced polymer (CFRP), drives differences in noise attenuation across three dimensions: acoustic absorption coefficients, effective frequency ranges, and integration with major engine families. By synthesizing quantitative data from the existing literature and organizing it around a cross-material comparative framework, this review provides a structured basis for understanding why manufacturers select specific materials in response to International Civil Aviation Organization (ICAO) Chapter 14 noise certification requirements. The analysis shows that while aluminum offers structural efficiency at low cost, Nomex dominates acoustic liner applications due to its superior sound absorption coefficient (up to 0.99 at resonance) and fire resistance, and CFRP is increasingly adopted where structural and acoustic demands converge. This synthesized comparison reveals clear trade-offs that are not visible when materials are analyzed in isolation and demonstrates that informed material selection is a direct lever for achieving regulatory compliance.