Do you then need to use some sort of end correction to get the effective'length'of the port so you can then calculate the mass of the air that gives the inertance ?-- SpectrumAnalyser 22 : 18, 25 July 2007 ( UTC)
12.
It is a transcendental equation where " A c " is the cross sectional area of a cylindrical cavity of depth " L " . " A o " is the area of the circular orifice of depth " L o ", " ? e " is the exterior end correction, " ? i " is the interior end correction, and " kL " is the Helmholtz number ( acoustical Strouhal number with 2 added ).
13.
It is a transcendental equation where " A c " is the cross sectional area of a cylindrical cavity of depth " L " . " A o " is the area of the circular orifice of depth " L o ", " ? e " is the exterior end correction, " ? i " is the interior end correction, and " kL " is the Helmholtz number ( acoustical Strouhal number with 2 added ).
