Perm National Research Polytechnic University has developed a new sound-absorbing design to reduce the noise of gas and air flows in engines. The solution is intended for aviation, transport, and industry; the development document has been published in the FIPS database.
The panel is a single-layer system with a perforated shell and a cellular filler. The cells differ in shape and volume; they are combined into repeating groups, where the central chamber is surrounded by elements with modified parameters. This combination creates a resonant effect and expands the range of suppressed frequencies.
The developers additionally placed rigid elements and membranes inside the cells at different angles. This makes it possible to control the acoustic resistance of the structure and enhances the damping of sound waves. Perforation between the cells increases the stability of the panel's operation when the load changes.
The solution provides broader-band noise suppression compared with traditional counterparts. The structure can be manufactured using standard methods, including 3D printing, which simplifies implementation in aviation and industrial systems.
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