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Old 19th December 2012, 10:00 PM   #371
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Very good writeup, wmb!
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Old 19th December 2012, 10:12 PM   #372
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WrineX,

The corners don't matter as they do in a horn as we're not trying to preserve a coherent waveform through the length of the pipe. You could actually model your cabinet as a simple straight TL and then just fold it during construction, measuring the length down the center of the pipe. Empirical tests have shown this method works well.
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Old 19th December 2012, 10:33 PM   #373
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Schmeet, just emailed you the error details from trying to use 'Create Tapped Horn'. (set to inches with 2 decimal places)
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Old 20th December 2012, 10:27 AM   #374
schmeet is offline schmeet  United Kingdom
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Keri, is the error repeatable? Could you describe what you are doing.
I can't re-create the error at my end.

Also, is the driver library working for everybody?
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Old 20th December 2012, 11:52 AM   #375
schmeet is offline schmeet  United Kingdom
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Just a quick guide on how you model Tapped Horns.

We are going to create a tapped horn which is similar to the design below:
Click the image to open in full size.

The image below shows the steps to create a simple Tapped Horn.
Start a New Project and open the Geometry Display window.

The default project is a tapered transmission line.
Click on the element and press R. This reverses the element and you now have a horn...

We want to offset the driver. So select the element and press S to split it. Drag the split to around 0.3m.

Select the 1st small element and copy it (Ctrl + C). Then delete it (Del).
Then right click on the remaining element and right click then Paste -> As Branch.

Then select the element you have just pasted and reverse it (R). Spin it round so it looks right.

You now have a horn with an offset driver.

Select the long element and press S to split it again. Drag this split to around 1.7m.

This split point is where we are going to create the 'Tap'.
Right click on the element and select "Create 'Tapped Horn'".

This will copy the enclosure to the front side of the driver with the driver at the point we selected. The two enclosures are linked so making any changes to the enclosure will be made to both 'sides'.

This isn't a great design but hopefully it shows you how a tapped horn can be modelled.

Click the image to open in full size.Click the image to open in full size.
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Old 20th December 2012, 12:35 PM   #376
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Hmmm... The error with the Create 'tapped horn' is what happens when you don't have the driver offset.

Can't get driver files from WinISD to work, either.


The "TH" above the display window is counter-intuitive, sitting next to 'Select Front', 'Select Back' buttons. Maybe the letters should be red?

It's "parabolic", not "parabolical".

Buttons for 0, 90, 180, and 270 degrees would be cool.
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Old 20th December 2012, 12:53 PM   #377
schmeet is offline schmeet  United Kingdom
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Argh.. I hate it when you guys get errors that I don't get.

I can do Tapped Horns without an offset driver and also WinISD driver files work for me too..

Do you copy the WinISD files into your driver library? What happens, do they just not appear or don't load properly? do you get an error?


(Cheers for the heads up on 'Parabolical' )
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Old 20th December 2012, 01:19 PM   #378
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They simply don't appear. I copied them to the folder, renamed them, restarted... none show.
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Old 20th December 2012, 01:30 PM   #379
schmeet is offline schmeet  United Kingdom
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Quote:
Originally Posted by Keriwena View Post
They simply don't appear. I copied them to the folder, renamed them, restarted... none show.
Ah.. Don't rename them.... they need to stay as .wdr files
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Old 20th December 2012, 01:54 PM   #380
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Ah, that's it. They are .dri files. Apparently, not quite the same. The name doesn't show and the Vas is off by three decimal points.
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