Blocked Impedance Results at 1kHz


Variation of the BlockedImpedance problem where the impedance and inductance of the SSF-082 loudspeaker are analyzed at 1kHz across a range of positions. Since the frequency is low (relative to 20kHz), a coarser surface mesh of 0.05mm can be used on the low carbon steel parts. Two configurations are considered: one with no shorting ring, and one with a copper shorting ring around the central pole.
 (image: http://www.femm.info/wiki/BlockedImpedance1kHz/files.xml?action=download&file=fig0.png)
Figure 1: Loudspeaker geometry depicting shorting ring location.

Example scripts in Mathematica, Matlab, and Lua are available below in the Files section. The results of the analysis are pictured below in Figures 2-6.

 (image: http://www.femm.info/wiki/BlockedImpedance1kHz/files.xml?action=download&file=fig1.png)
Figure 2: |Impedance| vs. Position. Analogous to ZL(jω) shown in Figure 10 in this Klippel paper.

 (image: http://www.femm.info/wiki/BlockedImpedance1kHz/files.xml?action=download&file=fig2.png)
Figure 3: |Inductance| vs. Position

 (image: http://www.femm.info/wiki/BlockedImpedance1kHz/files.xml?action=download&file=fig4.png)
Figure 4: Re[Inductance] vs. Position. Analogous Leff(f) shown in Figure 16 in this Klippel paper.

 (image: http://www.femm.info/wiki/BlockedImpedance1kHz/files.xml?action=download&file=fig6.png)
Figure 5: Re[I*ω*Inductance] vs. Position. Analogous to Reff(f) shown in Figure 17 in this Klippel paper.

 (image: http://www.femm.info/wiki/BlockedImpedance1kHz/files.xml?action=download&file=fig5.png)
Figure 6: B*l vs. Position

Attachments
File Last modified Size
fig5.png 2015-11-03 20:41 10Kb
SSF-082_1kHz.fem 2015-11-03 21:02 10Kb
fig0.png 2015-11-12 21:49 5Kb
fig1.png 2015-11-12 21:52 11Kb
fig2.png 2015-11-12 21:54 13Kb
fig4.png 2015-11-12 21:55 14Kb
fig6.png 2015-11-12 21:59 11Kb
ssf-082-ring1.FEM 2015-11-12 22:01 9Kb
ssf-082_vs_position_at_1kHz-ring1.nb 2020-08-30 18:55 78Kb
ssf-082_vs_position_at_1kHz.nb 2020-08-30 18:55 51Kb
ssf_082_vs_position_1kHz.lua 2020-08-30 18:56 2Kb
ssf_082_vs_position_1kHz.m 2020-08-30 18:57 3Kb
ssf-082_vs_position_at_1kHz.pdf 2020-08-30 18:58 103Kb
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