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Your partner for acoustic testing

As a producer of innovative new products, it is crucial to exactly know the acoustic specifications. One can think of the resistance of acoustic meshes, where an important trade-off has to be made between resistance to unwanted dirt, or water entrance and the acoustic transparency. For building acoustics, an important quantity is the sound absorption coefficient of a material. The experimental determination of acoustic material properties requires a proper understanding of physical acoustics, equipment such as an impedance tube and proper mathematical analysis software. ASCEE's acoustic laboratory contains the right tools to effectively characterize acoustic materials.

Impedance tube

Our in-house impedance tube is able to characterize acoustic materials, such as porous absorbers and perforated sheets, in a wide frequency range from 40 Hz to 4 kHz. Using our setup and software, we are for example able to determine the following acoustic material parameters:

  • Normal incidence sound absorption coefficient (\(\alpha\))
  • Reflection coefficient (\(R\))
  • Normalized impedance (\(\zeta_n\))
  • Acoustic scattering parameters (\(\mathbf{T}\))
  • Delaney-Bazley-Miki (DBM) material parameters
  • Johnson-Champoux-Allard (JCA) material parameters

Using these parameters, a simulation model can be created to determine the effect of a sound insulation solution.

Material database

ASCEE has established a database of material properties of common absorptive acoustic materials, such as foams and fibre wools, which can be used to simulate the noise reduction in a system or room.

Silencer transmission loss

ASCEE is experienced and able to test custom silencer transmission loss, including flow, for ventilation systems according to the ISO 11 820 (1996).

Anechoic room

As the word implies, an anechoic room is a room without any echoes. This means that all sound is absorbed by the walls of such a room. Anechoic rooms are typically used to create 'ideal' acoustic situations, i.e. a perfect free field for acoustic radiation.