Acoustic evaluation for R&D in air distribution systems, fans and components across industry, HVAC and building acoustics

Precise and standards-compliant measurements enable a reliable assessment of acoustic properties. They provide a solid basis for product optimization, reduce development risks, and support compliance with legal and normative requirements in research and industry. Furthermore, improved acoustics offer a clear competitive advantage.

In the reverberation chamber of the institute, we perform precise and standards-compliant acoustic measurements under controlled conditions. With a volume of over 200 m³, the chamber enables reliable investigations in the frequency range from 100 Hz to 10 kHz, providing a solid basis for both research and industrial applications. Test objects such as fans are integrated into the setup via existing wall penetrations. A duct system with a supporting fan allows the realistic adjustment of defined operating points, enabling acoustic properties to be analyzed under practical conditions. Measurements are carried out using up to eight microphones from Microtech Gefell and are evaluated with a Sinus Soundbook Expander Mk2. The results are provided as detailed third-octave (terz-band) spectra of sound power. In addition, sound absorption can be determined using the reverberation time method. A broadband noise signal is introduced into the chamber and then switched off. The frequency-dependent decay of the sound pressure level is recorded, from which the reverberation time and the sound absorption coefficient of the investigated systems are calculated. For the determination of the standardized sound reduction index, a mobile source room is used, which can be directly connected to the reverberation chamber. A defined sound field is generated in the source room, while the transmitted sound through the test specimen is measured in the receiving room. The evaluation is performed in accordance with relevant standards based on the sound pressure level difference. In addition, measurements of reverberation time and sound absorption allow a comprehensive acoustic characterization of materials, components, and flow-acoustic systems.