file Akabak for beginers

9 years 4 months ago #7377 by bee
Replied by bee on topic Akabak for beginers
Visc=... (Optional) Reflex enclosure. Factor to switch off calculation of vent-damping due to
viscosity or to modify its strength.
Off: Visc = 0
Default: Visc = 1
Decrease of damping: Visc = 0 ... 1
Increase of damping: Visc > 1

There are referances all the way through the manuel on visc if you do a key word search on the manuel it will highlight them all for you.

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9 years 4 months ago #7491 by bee
Replied by bee on topic Akabak for beginers
ok i have been trying to script the single usb and the single hd15, see plots below....



the usb script is....

Def_Driver 'Driver'

SD=1188.0cm2
fs=32Hz
Mms=211g
Qms=10.38
Qes=0.36
Re=6.19ohm
Vas=237.9L
Bl=27.0Tm
Cms=0.12mm/N
Le=4.78mH
ExpolE=1

System 'System'

Driver Def='Driver''Driver'
Node=0=1=2=3

Enclosure 'Rear chamber'
Node=2
Vb=68.2L

Duct 'Throat chamber'
Node=3=4
SD=1188.00cm2
Len=14.85cm
Visc=0

Waveguide 'Horn segment 1'
Node=4=5
STh=830.76cm2
SMo=980.4cm2
Len=10.0cm
Conical

Waveguide 'Horn segment 2'
Node=5=6
STh=980.4cm2
SMo=1145.52cm2
Len=10.0cm
Conical

Waveguide 'Horn segment 3'
Node=6=7
STh=1145.52cm2
SMo=1460.28cm2
Len=10.0cm
Conical

Waveguide 'Horn segment 4'
Node=7=8
STh=1460.28cm2
SMo=1991.76cm2
Len=10.00cm
Conical

Waveguide 'Horn segment 5'
Node=8=9
STh=1991.76cm2
SMo=2507.76cm2
Len=10.0cm
Conical

Waveguide 'Horn segment 6'
Node=9=10
STh=2507.76cm2
SMo=2796.72cm2
Len=5.3cm
Conical

Radiator 'Horn mouth'
Node=10
SD=2796.72cm2

and the hd15 script is......

Def_Driver 'Driver'

SD=856.3cm2
fs=35Hz
Mms=102g
Qms=7.3
Qes=0.32
Re=6.5ohm
Vas=198.8L
Bl=21.6Tm
Cms=1.53E-04m/N
Le=1.40mH
ExpolE=1

System 'System'

Driver Def='Driver''Driver'
Node=1=0=2=3

Enclosure 'Rear chamber'
Node=2
Vb=51L
Sb=855.00cm2


Duct 'Throat chamber'
Node=3=4
SD=1982.40cm2
Len=10.08cm
Visc=0

Waveguide 'Horn segment 1'
Node=4=5
STh=544.80cm2
SMo=722.16cm2
Len=27.38cm
Conical

Waveguide 'Horn segment 2'
Node=5=6
STh=722.16cm2
SMo=1054.92cm2
Len=15.25cm
Conical

Waveguide 'Horn segment 3'
Node=6=7
STh=1054.92cm2
SMo=1785.57cm2
Len=15.36cm
Conical

Waveguide 'Horn segment 4'
Node=7=8
STh=1785.57cm2
SMo=2206.16cm2
Len=8.97cm
Conical

Radiator 'Horn mouth'
Node=8
SD=2206.16cm2



but im not happy with the results any ideas guys...

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9 years 2 months ago #8255 by bitzo
Replied by bitzo on topic Akabak for beginers
may be....vtc isn't correct....try to add the cone volume 4500e-6 for 15", 6500e-6 for 18" I think. Define the section by rectangular areas I mean hth wth etc...


Anyone can sim on akabak at 4pi? The coupler function is useful for more than one cab...but at 2pi.

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9 years 2 months ago #8273 by jsg
Replied by jsg on topic Akabak for beginers
As I understand it, if you specify baffle height and width in the "Radiator" section, Akabak starts modelling an enclosure in 4pi with baffle-step[1]. Then you can use "Reflector" to add reflecting boundaries such as the floor.

[1] Baffle-step is a big deal. It can tilt your response by 3dB/octave and drop the sensitivity of drivers by up to 6dB compared to the half-space sensitivity usually quoted on data sheets. For some driver/baffle combinations, it can even add a 3-6dB peak!

Ars est celare artem

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9 years 2 months ago #8278 by bitzo
Replied by bitzo on topic Akabak for beginers
Thanks JSG, so let me says what I get from your post.
Describe radiator dimension and distance between the floor defining y value on radiator elements, am I right?

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9 years 1 month ago #8371 by bitzo
Replied by bitzo on topic Akabak for beginers
Just another issue....
I'm trying to sim more than one cab stacked...so I take the jsg mighty dubpass script with the coupler...but if I set the num variable to 1 I'm expeting to have the same response without the coupler....but it's so different at all.

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9 years 1 week ago #8686 by bee
Replied by bee on topic Akabak for beginers
Ok im trying to sim the martin 215mk3 but not very well......... any ideas where im going wrong......

|COMMENT: martin 215mk3 pd1550

Def_Driver 'Bassdriver1'

SD=890cm2
fs=31Hz
Mms=123.4g
Qms=5.55
Qes=0.22
Re=6.4ohm
Vas=242L
Bl=26.34Tm

Def_Driver 'Bassdriver2'

SD=890cm2
fs=31Hz
Mms=123.4g
Qms=5.55
Qes=0.22
Re=6.4ohm
Vas=242L
Bl=26.34Tm

System 'System'

Driver Def='Bassdriver1''Driver 1'
Node=1=0=5=6

Duct 'Rear chamber'
Node=4=5
SD=5.56cm2
Len=23cm
Visc=0

Duct 'Throat chamber'
Node=6=12
SD=1660.00cm2
Len=3.61cm
Visc=0


Driver Def='Bassdriver2''Driver 2'
Node=1=0=10=11

Duct 'Rear chamber'
Node=9=10
SD=5.56cm2
Len=23cm
Visc=0

Duct 'Throat chamber'
Node=11=12
SD=1660.00cm2
Len=3.61cm
Visc=0

Waveguide 'Horn segment 1'
Node=12=13
STh=640.00cm2
SMo=1372.00cm2
Len=50.00cm
Conical

Waveguide 'Horn segment 2'
Node=13=14
STh=1372.00cm2
SMo=1960.00cm2
Len=29.50cm
Conical

Waveguide 'Horn segment 3'
Node=14=15
STh=1960.00cm2
SMo=3150.00cm2
Len=28.00cm
Conical

Waveguide 'Horn segment 4'
Node=15=16
STh=3150.00cm2
SMo=4876.00cm2
Len=24.00cm
Conical

Radiator 'Horn mouth'
Node=16
SD=4876.00cm2

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8 years 6 months ago #10260 by bee
Replied by bee on topic Akabak for beginers
God im starting to hate akabak...... lol.....

im having problems trying to sim a 6th order sript is below........
cant work out where im going wrong any ideas.............

Def_Driver 'Driver'

FS=32Hz
Re=5.3ohm
Qes=0.32
Qms=5.6
Vas=187dm3
Sd=1210cm2
Mms=275g
Bl=30.30Tm
Le=1.90mH
Cms=8.96E-05m/N
Rms=9.91Ns/m
ExpoLe=1

System 'System'

Driver Def='Driver''Driver'
Node=1=0=5=6

Radiator 'Port outlet'
Node=3
SD=684.00cm2
Label=1

Duct 'Port'
Node=3=4
SD=684.00cm2
Len=26.00cm
Visc=0

Duct 'Rear chamber'
Node=4=5
SD=1.23cm2
Len=50.40cm
Visc=0

Duct 'Throat chamber'
Node=6=8
SD=2520.00cm2
Len=75.0cm
Visc=0

Duct 'Horn segment 1'
Node=8=9
SD=684.00cm2
Len=43.50cm
Visc=0

Radiator 'Horn mouth'
Node=9
SD=684.00cm2
Label=2

am i making a skool boy error or is this the wrong way to sim it........ smiley33

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8 years 6 months ago #10261 by JJD
Replied by JJD on topic Akabak for beginers
easy: I think it's 1230cm2 and not 1.23cm2 which is really too small, so:

Duct 'Rear chamber'
Node=4=5
SD=1230cm2
Len=50.40cm
Visc=0

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8 years 6 months ago #10262 by bee
Replied by bee on topic Akabak for beginers
skool boy error lol...... been going over it for an hour...... not sure how i missed it lol cheers m8t.

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