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Subject Resistance correction
Date
Mon Apr 19 2004 10:48
Author Tor Erik Vigran
(vigran@iet.ntnu.no)
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The resistance correction is purely empirical, partly to make up for not modelling fully the impedance seen from the hole or slit into a porous backing layer. Setting this factor equal to one you will add a resistance component to your panel equal to a thickness of one end correction of your porous material. An example: For a perforated plate the end correction is approximately 0.85 times the radius of the holes. Using holes of radius, say 4 mm, and a porous layer with flow resistivity 10 kPa×s/m2 you will add as a maximum (setting the correction equal to one) a resistance layer to your plate equal to 0.85 x 0.004 x 10000 = 34 Pa×s/m. If your experience shows that this give a better fit to measured values please feel free to change this parameter from its default value.
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