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Old 30th January 2011, 11:12 AM   #1
steffda is offline steffda  Germany
diyAudio Member
 
Join Date: Feb 2010
Default Help with speaker simulation

Hi,
I have tried to simulate the behavior of a loudspeaker. For that I have used the model from Micka (http://micka.de/org/en/download/spice-tsp_en.pdf).
For comparison, I've resorted to Kyle's Lahnakoski versions (Driver Analysis).
All things the results are not in the approach similar to the above in the published sources.

My question to the experts here: What's going wrong?

I am currently at a loss.

The first two pictures are the simulation of a speaker without box with qucs and the result.

The next four pictures are the simulation of a bass reflex box and the results.

Greetings
Steffen
Attached Images
File Type: gif LS-Simulation.gif (20.8 KB, 208 views)
File Type: gif LS-Resultat.gif (69.5 KB, 193 views)
File Type: gif BR-LS-Simulation.gif (40.2 KB, 192 views)
File Type: gif BR-LS-Resultat-SPL.gif (53.4 KB, 187 views)
File Type: gif BR-LS-Resultat-PePa.gif (47.1 KB, 186 views)
File Type: gif BR-LS-Resultat-UI-out.gif (50.7 KB, 36 views)
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Old 31st January 2011, 04:18 PM   #2
steffda is offline steffda  Germany
diyAudio Member
 
Join Date: Feb 2010
But I think I've found the error:
In the simulations I did Le = 0.47 * 10e-3, which is interpreted by qucs not as expected.
If I do Le = 0.47 * 10 ^ (-3) or set Le = 0.47 * 0.001 then the results are plausible and are consistent with those of Micka.
The current in the 2.7 uF capacitor accordingly corresponds to the course of sound pressure.
Some "play" with the parameters of the box then shows the curves that result with other box-simulations and other publications.

Greetings
Steffen
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Old 2nd February 2011, 06:36 PM   #3
steffda is offline steffda  Germany
diyAudio Member
 
Join Date: Feb 2010
So, I got it
Attached is a zip-file with a qucs-library for loudspeakers (just loudspeaker, closed box and vented box) and also a qucs-projekt with the schemes.
On the pictures is a 2-way-box simulation, just as example :-)

Greetings
Steffen
Attached Images
File Type: gif 2-way-box-simulation.gif (27.6 KB, 68 views)
File Type: gif 2-way-box-result.gif (63.0 KB, 67 views)
Attached Files
File Type: zip qucs.zip (5.0 KB, 35 views)
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