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Old 4th October 2012, 11:16 PM   #2881
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Quote:
Originally Posted by Don Hills View Post
In summary, "close enough for rock'n'roll".
There was never any doubt about that. Can you show the math you are using to approximate the PAR flare with CON segments?
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Old 5th October 2012, 06:37 AM   #2882
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Default Hornresp Update 3000-121005

Hi Everyone,

CHANGE 1

Three new File menu commands have been added, accessible from the Input Parameters window.

File > New...
Creates a new data file.

File > Open...
Opens an existing data file.

File > Editor...
Moves or copies records from one data file to another, or deletes records from a data file.

The new File menu commands mean that Hornresp records can now be stored across different data files if so desired. The new functionality has been extensively tested but there is always the possibility that I may have missed something. As a precaution it is recommended that a backup copy of any existing Hornresp.dat file be taken and safely archived prior to using the latest release.

CHANGE 2

A chart showing electrical impedance phase has been added, as requested by sebDIY. The chart is generated by selecting the Tools > Phase menu command from the Electrical Impedance window.

As always, could you please report any bugs.

Kind regards,

David
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Old 5th October 2012, 06:43 AM   #2883
Kolbrek is offline Kolbrek  Norway
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Quote:
Originally Posted by buzzforb View Post
Kolbreck,
Sorry to interupt,but do you have details of your latest horn that replaced Azura 425. Did not see build info on your page. Sorry for OT.
I have been planning for a long time to put up some info. So please be patient, it will come

-Bjørn
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Old 5th October 2012, 07:10 AM   #2884
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Quote:
Originally Posted by Kolbrek View Post
Suggestion: The throat adapter is in effect a 5th segment. It is always conical, but that should be a minor issue. If it was possible to specify that the throat adapter should be the first segment in an otherwise offset horn, we would gain back that first segment for use in the main part of the horn.

-Bjørn
Hi Bjørn,

Nice try, but I suspect that you probably already know the answer - "Sorry, it's not going to happen." :-).

It would only be a matter of time before someone then asked for the same technique to be applied to tapped horns. Things would start to get complicated very quickly...

Kind regards,

David
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Old 5th October 2012, 07:33 AM   #2885
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Quote:
Originally Posted by just a guy View Post
There was never any doubt about that. Can you show the math you are using to approximate the PAR flare with CON segments?
Hi just a guy,

As an alternative to working through the calculations yourself, simply to export the Hornresp schematic diagram horn data for a parabolic segment, and then note the cross-sectional area values at the end points chosen for each of the conical segments used to approximate the parabolic profile.

Hope this makes sense - I'm not sure how else to describe the process :-).

Kind regards,

David
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Last edited by David McBean; 5th October 2012 at 07:37 AM.
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Old 5th October 2012, 01:29 PM   #2886
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Quote:
Originally Posted by David McBean View Post
Hi just a guy,

As an alternative to working through the calculations yourself, simply to export the Hornresp schematic diagram horn data for a parabolic segment, and then note the cross-sectional area values at the end points chosen for each of the conical segments used to approximate the parabolic profile.

Hope this makes sense - I'm not sure how else to describe the process :-).

Kind regards,

David
You described it just fine, that's actually the only way I know how to do it.

I was hoping Don would have a simple equation that would be even faster and easier than doing it that way. The math probably isn't faster or easier but I'm having fun with the thought until someone smashes it with reality.
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Old 6th October 2012, 02:51 AM   #2887
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Default Hornresp Update 3000-121006

Hi Everyone,

Some minor refinements have been made to the operation of the new Data File Editor.

Kind regards,

David
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Last edited by David McBean; 6th October 2012 at 02:54 AM.
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Old 6th October 2012, 03:57 AM   #2888
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Quote:
Originally Posted by just a guy View Post
I was hoping Don would have a simple equation that would be even faster and easier than doing it that way.
Hi just a guy,

I am not sure how Don does it, but the mathematical method I would most probably use is as follows.

Assuming that you have a single parabolic segment defined by S1par, S2par and L12par, and that you want to approximate it by four conical segments.

Define:

X = L12par / ((S2par / S1par) – 1)

X1 = 0
X2 = X1 + 1 * L12par / 15
X3 = X2 + 2 * L12par / 15
X4 = X3 + 4 * L12par / 15
X5 = X4 + 8 * L12par / 15

Then for the four conical horn segments:

S1con = S1par * (1 + X1 / X)
S2con = S1par * (1 + X2 / X)
S3con = S1par * (1 + X3 / X)
S4con = S1par * (1 + X4 / X)
S5con = S1par * (1 + X5 / X)

L12con = X2 - X1
L23con = X3 - X2
L34con = X4 - X3
L45con = X5 - X4

For example:

S1par = 100
S2par = 4000
L12par = 150

Giving:

X1 = 0
X2 = 10
X3 = 30
X4 = 70
X5 = 150

S1con = 100
S2con = 360
S3con = 880
S4con = 1920
S5con = 4000

L12con = 10
L23con = 20
L34con = 40
L45con = 80

I would be interested if anyone has a simpler method.

Kind regards,

David
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Old 6th October 2012, 04:21 PM   #2889
sebDIY is offline sebDIY  Belgium
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Quote:
A chart showing electrical impedance phase has been added, as requested by sebDIY. The chart is generated by selecting the Tools > Phase menu command from the Electrical Impedance window.
Thank you David, it's perfect !
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Old 6th October 2012, 07:22 PM   #2890
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Quote:
Originally Posted by David McBean View Post
Hi just a guy,

I am not sure how Don does it, but the mathematical method I would most probably use is as follows...
Thanks! I'm gonna take awhile to think about all this before asking if you can incorporate that right into the Export wizard thing. I'm not sure it would be worth your time even if it wasn't difficult to implement.

Now can you upgrade Akabak so it can export a text file describing the horn path (csa vs length) like Hornresp does? LOL, just kidding, but that would be nice.

(Seriously though, does anyone know if Akabak can do that? I looked but didn't see that feature.)
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