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AirReSys flow resistivity measurement system

Flow resistivity measurement

Flow resistivity measurement

Nihon Onkyo Engineering provides a system that measures flow resistivity, one of the most important parameters and one of the parameters of poro-elastic (Biot) model that characterize the acoustic property of the material. Flow resistivity can be used in STRATI-ARTZ acoustic material modeling software and in various simulation software using SEA or FEM calculations.

What is flow resistivity?

Air flow in a porous material

Flow resistivity is one of the parameters to consist the acoustic model that represents the pressure loss during the air flow through the material. Sounds is the vibrations in the air, so it is easy to imagine how hard it is for sound to be transmitted through material that even air can hardly pass through. Solid materials such as iron and rubber, through which air cannot easily pass through, do not propagate air-borne sounds but instead propagate only structure-borne sounds, i.e., vibrations.

Flow resistivity measurement

Flow resistivity measurement systemFlow resistivity is measured by obtaining the pressure difference between the front and back (primary side and secondary side) of a material while air is passing through the material. The flow velocity for measurement is extremely slow, set at 0.5 mm/s, as stipulated in ISO 9053. As a result, the differential pressure over the material is also extremely small, and a highly accurate differential pressure sensor is needed.


Measurement method Direct current method (complying with ISO 9053)
Size of sample (diameter) 40 mm (supported by Nihon Onkyo Engineering acoustic impedance tubes), 100 mm (ISO 9053)
Measurement air flow velocity range 0.1 - 3.0 mm/s
Maximum differential pressure 133.32 Pa
PC OS: Windows 10
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