Russian scientists find way to make aircraft engines quieter

MOSCOW, 20 March (BelTA - TV BRICS) - Researchers at Perm National Research Polytechnic University have developed an innovative sound-absorbing structure that effectively reduces aircraft engine noise. The invention is expected to make flights more comfortable for passengers by lowering noise levels, according to the university’s website.

Aircraft engine noise, characterised by uneven sound patterns and high frequencies, has a negative impact on human health. Residents living near airports face increased risks of hypertension, cardiovascular diseases, sleep disorders and reduced cognitive performance.

At the same time, wildlife is also affected: noise drives birds away from nesting areas and disrupts animal migration routes. To reduce noise, engine ducts are typically lined with special sound-absorbing panels. Russian scientists have proposed a new design featuring an advanced filler that absorbs sound energy more efficiently.

Instead of conventional hexagonal honeycomb structures, which are tuned to specific frequencies, the researchers designed cone-shaped cells. Each element absorbs noise at its own frequency.

The development is reported to be 1.5 times lighter than multilayer alternatives, while delivering sound absorption 20 decibels higher than traditional single-layer panels. The compact panel operates across a wide frequency range from 2,000 to 5,400 hertz, reducing noise throughout this spectrum.

According to the developers, the new panels can make aircraft quieter without increasing weight or raising production costs.