Loudspeaker mass normalized mode shapes

thadman · 23rd July 2009, 03:29 PM

I'm interested in calculating the mass normalized mode shapes for various loudspeaker diaphragms for simulation purposes in order to have a more complete understanding of their behavior.

I believe mass normalized mode shapes are scaled such that

p*A*Integral of (mode)^2 = 1, where p = density and A = cross sectional area

I'm specifically interested in cones, domes, and ribbons.

I'm having a bit of difficulty sourcing the equations, if anyone could provide insight on this I would be much appreciative.

Thanks,
Thadman

thadman · 26th July 2009, 02:25 PM

Anybody?

noah katz · 26th July 2009, 06:08 PM

Not sure what you mean by "mass normalized".

If you use FEM/FEA with correct material properties and thicknesses you'll get the correct modes.

But I hope you know where to get those material properties.

23rd July 2009, 03:29 PM	#1
thadman diyAudio Member Join Date: Dec 2005 Location: west lafayette	Loudspeaker mass normalized mode shapes I'm interested in calculating the mass normalized mode shapes for various loudspeaker diaphragms for simulation purposes in order to have a more complete understanding of their behavior. I believe mass normalized mode shapes are scaled such that pAIntegral of (mode)^2 = 1, where p = density and A = cross sectional area I'm specifically interested in cones, domes, and ribbons. I'm having a bit of difficulty sourcing the equations, if anyone could provide insight on this I would be much appreciative. Thanks, Thadman __________________ "It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them."

26th July 2009, 02:25 PM	#2
thadman diyAudio Member Join Date: Dec 2005 Location: west lafayette	Anybody? __________________ "It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them."

26th July 2009, 06:08 PM	#3
noah katz diyAudio Member Join Date: Jul 2004 Location: Mountain View, CA	Not sure what you mean by "mass normalized". If you use FEM/FEA with correct material properties and thicknesses you'll get the correct modes. But I hope you know where to get those material properties. __________________ ----------------------------------------- Noah

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