Abstract
A simple device for static measurements of flow resistance on thin porous materials is developed and evaluated. The device consists of a duct with a piston which is driven at a steady low speed. This generates a flow of air with constant volume velocity. The duct ends with a cavity with an interface to the outside where the sample is mounted. The differential pressure between the cavity and the outside is measured. In order to prevent nonlinear effects, the speed of the piston is kept so low that the constant velocity of the air is of the same order of magnitude at the sample as the rms velocity of sound waves at approximately 100 dB SPL. The device is so constructed that it is possible to measure samples of standard dimensions, e.g., cloth mounted at different perforated frames, if the speed of the moving piston is accordingly adjusted to match the open area. The performance of the device is tested and discussed.
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