Re: [femm] eddy-curr in a tube

[dcm3c@xxxxxxx]

In a message dated 4/4/01 10:01:28 AM Eastern Daylight Time, 
rlbrambilla@xxxxxxx writes:


> Hi, femm-friends
>
> I have a tube of finite length=2L, inner-radius=b, 
> outer radius=a, relative  mag. perm.=mur, 
> el. conductivity=sigma. 
> An infinite alternating current line  Io.exp(jwt) is positioned 
> (1) on the axis of the tube;
> (2) parallel to the axis, out at a distance.
 Do you know if any analytical 
solutions for eddy currents in the tube exist to compare with FEMM analysis?
> Thank you in advance Roberto.
> Roberto Brambilla
> CESI
> Via Rubattino 54
> 20134 Milano
> tel +39.2.2125.5875
> fax +39.2.2125.610
> rlbrambilla@xxxxxxx


This seemed like it might make an interesting test case. I figured out an 
analytical solution for the case where you have a wire carrying AC running 
down the bore of a finite length steel tube and compared it to femm's 
solution of the same problem.  I think this is the same as your case (1).  
Check out:
http://members.aol.com/_ht_a/gmagnetics/tube/tube.htm

David Meeker
--
http://members.aol.com/_ht_a/dcm3c