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Old 20th January 2020, 11:26 PM   #821
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by limacon View Post
Error... SVD did not converge?
Seems like it will need nature to solve that out
- What did you try to do?
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Old 20th January 2020, 11:30 PM   #822
limacon is offline limacon  United Kingdom
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Downloaded latest version and added latest 3 config lines to my conf. :-) Will try your demo project.

Last edited by limacon; 20th January 2020 at 11:35 PM.
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Old 20th January 2020, 11:36 PM   #823
mabat is offline mabat  Czech Republic
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This works for me (se1.cfg) -


; -------------------------------------------------------
; Horn Geometry Definition
; -------------------------------------------------------

ThroatDiameter = 25.4 ; [mm]
ThroatAngle = 0 ; [deg]
Coverage_Horizontal = 95.0 ; [deg]
Coverage_Vertical = 90.0 ; [deg]
Depth = 100 ; [mm]
SE_s = 0.7
SE_n = 4.0
SE_q = 0.995
Depth.ConicSectionPart = 0.9
Shape = raw2rect
Shape.FixedPart = 0.2
Shape.CornerRadius = 35.0 ; [mm]

SEExp = 2.5 ; superellipse exponent

Termination = baffle ; baffle | free-air

; -------------------------------------------------------
; Mesh Setting
; -------------------------------------------------------

Mesh.AngularSegments = 64
Mesh.DepthSegments = 24
Mesh.LipSegments = 6
Mesh.CornerSegments = 8

Mesh.ThroatResolution = 5.0 ; [mm]
Mesh.WallResolution = 25.0 ; [mm]
Mesh.InterfaceResolution = 10.0 ; [mm]
Mesh.IBInterfaceRadiusRatio = 2.0
Mesh.InterfaceStrip = 10.0 ; [mm]

; -------------------------------------------------------
; ABEC Project Setting
; -------------------------------------------------------

ABEC.RadiationConditions = IB ; IB | box
ABEC.f1 = 800 ; [Hz]
ABEC.f2 = 12000 ; [Hz]
ABEC.NumFrequencies = 25
ABEC.MeshFrequency = 12000 ; [Hz]

ABEC.Polars.Distance = 2 ; [m]
ABEC.Polars.Step = 7.5 ; [deg]
ABEC.Polars.Points = 11
ABEC.Polars.Horizontal = yes
ABEC.Polars.Vertical = yes
ABEC.Polars.Diagonal = yes
ABEC.Polars.DiagonalInclination = 0.0 ; 0.0 -> automatic angle for max radius

; -------------------------------------------------------
; Output
; -------------------------------------------------------

Out.DestDir = "D:\Horns" ; set to your location

Out.Write_STL = yes
Out.Write_MSH = no
Out.Write_ABECProject = yes
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Old 20th January 2020, 11:46 PM   #824
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by Patrick Bateman View Post
Could you give users the ability to select the diameter of the baffle for ABEC?

For instance, the way that ATH4 works currently, is that the baffle is set to the size of the waveguide. ...
As it is now, it is always simulated in an infinite baffle. It is transparent in ABEC display but it is always there. Full free-space simulation is something I've never implemented. I want to do it (unbaffled, in a finite baffle or in a box) but for the next version of the tool for which there is still long long way to go...

That of course doesn't mean that the half-space simulation is not useful. I believe that a good result for an IB means the horn will perform very well in a box as well - we saw that already. For unbaffled situation that may be different and more complicated.
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Last edited by mabat; 20th January 2020 at 11:55 PM.
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Old 20th January 2020, 11:58 PM   #825
limacon is offline limacon  United Kingdom
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Glorious, thanks!
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Old 21st January 2020, 12:13 AM   #826
limacon is offline limacon  United Kingdom
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So,

I tried to get my room clear and added GIK242 on first reflections to the mic. Much better. First chart dirty orange.

With DSP I added a 1.3k,+4db,q1.5 notch to smooth the response out (blue). Chart attached is 850hz 24db bw3.

Depth.ConicSectionPart = 0.9 appears to give a 3db bump in that region.

I wonder if my design was flawed from the start using 0.2 there for a 1.4"
Attached Images
File Type: png hf146 1300 4db q1.5.png (35.0 KB, 223 views)
File Type: png hf146 0.9.png (58.1 KB, 216 views)

Last edited by limacon; 21st January 2020 at 12:30 AM.
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Old 21st January 2020, 12:16 AM   #827
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by mabat View Post
As it is now, it is always simulated in an infinite baffle. It is transparent in ABEC display but it is always there. Full free-space simulation is something I've never implemented. I want to do it (unbaffled, in a finite baffle or in a box) but for the next version of the tool for which there is still long long way to go...

That of course doesn't mean that the half-space simulation is not useful. I believe that a good result for an IB means the horn will perform very well in a box as well - we saw that already. For unbaffled situation that may be different and more complicated.
Ah, did not realize that. Thank you!
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Old 21st January 2020, 06:48 AM   #828
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by limacon View Post
Depth.ConicSectionPart = 0.9 appears to give a 3db bump in that region.

I wonder if my design was flawed from the start using 0.2 there for a 1.4"
In the new version (4.4), the Depth.ConicSectionPart together with Coverage_Horizontal and Coverage_Vertical determine at what distance from the throat (ConicSectionPart*Depth) and of what dimensions is the shape curve - the curve in space (a superellipse influenced by SEExp) that the horn wall always goes through by means of varying of coverage angle. You should not mix the two software versions and the configuration files - the parameter Depth.ConicSectionPart has slightly different meaning now. I should have explained that. Value of 0.2 - 0.5 was perfectly fine before.

Sorry for the brevity, that is all I can offer for now.
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Last edited by mabat; 21st January 2020 at 06:57 AM.
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Old 21st January 2020, 07:42 AM   #829
mabat is offline mabat  Czech Republic
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Maybe I should also refresh this link: Graphing Calculator

This should help you to get a pretty good grasp of the OS+SE formula parameters ("t" should be Greek "tau" - throat entry angle, for some reason that didn't work).

- What was before governed by "Depth.ConicSectionPart" is now more affected by "n" and further by "s". The whole calculation of the profile is obviously different - now all by one formula and with a bit more freedom (not necessarily easier to optimize).
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Last edited by mabat; 21st January 2020 at 07:54 AM.
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Old 21st January 2020, 02:56 PM   #830
mabat is offline mabat  Czech Republic
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Just out of curiosity - I expected it even worse.
(54 x 22 x 16 cm = W x H x D)
Attached Images
File Type: png sb-4.PNG (242.8 KB, 153 views)
File Type: png sb_h.png (18.1 KB, 150 views)
File Type: png sb_pmap_h.png (33.3 KB, 147 views)
File Type: png spl_v.png (18.8 KB, 45 views)
File Type: png sb_pmap_v.png (31.9 KB, 47 views)
File Type: png sb_rimp.png (14.0 KB, 40 views)
File Type: png sb_mesh.PNG (434.8 KB, 53 views)
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