Scientists at Perm Polytechnic University have developed an innovative sound-absorbing structure for aircraft engines. The panels turned out to be 1.5 times lighter than multilayer analogues, while their noise reduction efficiency is approximately 20 decibels higher than traditional single-layer solutions, the university's press service explained.
To solve the problem of power plant noise, scientists developed a new design with cells in the shape of straight and inverted cones. Each element absorbs sound at its own frequency, and the combination of different volumes allows for effective noise reduction in a wide range.
Our design is practically insensitive to airflow and works stably in real conditions. The new panels make it possible to make airplanes quieter without making them heavier or making production more expensive.
Another advantage of the development is its resistance to manufacturing errors. Traditional panels are tuned to several specific frequencies, so even small deviations in cell size can reduce their effectiveness.
The new design is designed for a wide frequency range and remains operational even with minor defects or material irregularities.
As a reminder, "The First Technical" wrote about this development back in February 2026, but there were no such details in the FIPS patent. The document stated that the new panel is a single-layer system with a perforated shell and cellular filler.