Acoustic Measurement Equipment

FKFS has a wide range of standard and special acoustic measurement equipment, as well as the software tools needed to perform signal and modal analysis.

FKFS uses artificial heads to record binaural sound signals. By playing-back through headphones, these recordings ensure a natural acoustic impression including directional localization. This technology is important in the evaluation of sound quality.

A laser-scanning vibrometer can be used to detect the operational modes of vibrating surfaces. Hereby, our engineers and our customers are able to study the acoustics of the vehicle’s body structure. This includes structural vibration of e.g. body parts and windows in order to determine sources for radiated noise.

FKFS offers a selection of array systems and acoustic mirrors for the localization of sound sources. In the vehicle’s interior a spherical array or the so-called conformal mapping method, an acoustic holography, can be used. In addition, sound sources can be located by the Scan & Paint system, which is based on a PU probe. A small, mobile beamforming array as well as a large microphone array system in the aeroacoustic wind tunnel are available for the investigation of external noise.

The large microphone array system allows for the localization of sound sources between 400 Hz and 10 kHz from the top and from the side of the vehicle. With its 168 microphones (top array) and 144 microphones (side array), vehicles up to 5.5 m length, 2.3 m width and 2 m height can be investigated. In addition, the correlation between internal and external sound sources can be determined by means of the spherical array in the interior. The consideration of correlation and coherence to other sensors is also possible.