Light, quiet aviation - project launch of the FLIER joint project

As part of the joint project "Flexible Wall Structures for Acoustic Liners" (FLIER), employees of the Technische Universität Berlin (Institut für Strömungsmechanik und Technische Akustik, FG Turbomaschinen- und Thermoakustik and Institut für Strömungsmechanik und Technische Akustik, FG Technische Akustik), the Brandenburgische Technische Universität Cottbus-Senftenberg (Lehrstuhl für Flug-Triebwerksdesign) and the ILK are researching and developing noise-absorbing plastic structures for use in aviation.
Currently, liner structures based on the well-known Helmholtz resonator principle are used in engines for noise damping and are thus primarily effective in a narrow frequency range. Future generations of engines will be characterized above all by larger diameters combined with reduced length, and will therefore have comparatively less usable surface area for noise damping measures. The aim of the FLIER project is to use new liner technologies both to increase their acoustic effectiveness and to greatly extend the effective frequency range.
In the previous project, LAKS, the first test specimens were designed and manufactured to demonstrate the basic effectiveness of the new liner technology. In the recently approved follow-up project FLIER, the ILK will focus on developing suitable manufacturing strategies for the production of curved or curvable liners. The aim of the joint project is to create a comprehensive design concept, develop the manufacturing process, implement it in terms of production technology and carry out functional tests on a laboratory scale.
The project is funded under the Federal Republic of Germany's aeronautics research program (LuFo VI-1) for 3 years until 2023.