Product validation in R&D requires verified measurement data. In our acoustic laboratory in Nijverdal, we characterize materials and components, including using our in-house µZ impedance tube. We provide the measurement and calibration data needed to validate numerical simulations and verify product designs. For example, we convert this data into Delaney-Bazley-Miki (DBM) and Johnson-Champoux-Allard (JCA) parameters as input for COMSOL simulations.
Measure absorption and impedance in the µZ impedance tube for DBM and JCA material parameters in COMSOL.
Quantify the air resistance of mesh and membranes to determine the balance between dirt resistance and transparency.
Measure in-ear load, SPL, and insertion loss of hearing protection using the GRAS RA0402 simulator and LRFTubes digital twin.
Quantify the sound attenuation of ventilation dampers under the influence of airflow in accordance with ISO 7235:2003.
Quantify emissions in our 60 m² measurement chamber using Class 1 microphones or via the wind tunnel at the University of Twente.
Identify mechanical resonances and transmission paths to prevent the conversion of vibrations into sound.
Determine the exact absorption coefficient and acoustic impedance using our in-house µZ Impedance Tube. Generate the essential quantitative material parameters (such as DBM and JCA) to reliably calibrate your COMSOL simulation models.
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At our laboratory in Nijverdal, we determine the acoustic properties of porous absorption materials and meshes. Using our in-house µZ impedance tube (20 and 30 mm), we measure the normal sound absorption coefficient (α), reflection coefficient (R), and impedance (ζ) from 40 Hz to 4 kHz. We convert this data into Delaney-Bazley-Miki (DBM) and Johnson-Champoux-Allard (JCA) parameters as input for COMSOL simulations. In addition, we quantify the flow resistance of mesh to ensure a balance between dirt resistance and acoustic transparency.
In our 60 m² anechoic test chamber, we validate the acoustic performance of components and audio devices. We perform measurements using DT9837A data acquisition in ACME, sound level meters, and Class 1 microphones (DIN EN IEC 61094-4). For micro-acoustics and hearables, we use an IEC 60318-4 ear simulator (GRAS RA0402) to determine the load on in-ear drivers and the insertion loss of hearing protection, including integration with a digital twin in LRFTubes. In addition, we measure the transmission loss of ventilation dampers under flow conditions in accordance with ISO 7235:2003.
