Acoustics

The centrepiece of the acoustics laboratory consists of specially built reverberation chambers, which are decoupled from the building structure and in which all acoustic measurements are performed. The reverberation chambers comply with the recommendations of DIN EN ISO 3741 (Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms). The chamber volumes are 175m³ and 265m³. Depending on the measuring task, the tests are carried out in the respective antechambers or in the reverberation chamber itself. All the walls of the reverberation chambers are acoustically hard and antiparallel, which enables good sound distribution within the chamber. In this diffuse sound field, identical sound pressure level values are measured at freely selectable measuring points above a certain cut-off frequency and within a standardised tolerance range. The measured sound pressure level values are converted into sound power values. These form the basis for the acoustic data in our product documentation.

The test track, a double-walled, soundproofed and airtight duct section, is connected to the reverberation chamber. Due to the part with a variable duct width, sound attenuation elements (splitters) of different widths and distances can be tested. Sound attenuation properties such as insertion loss, flow noise and pressure loss are measured.