file Akabak for beginers

7 years 10 months ago #16350 by bee
Replied by bee on topic Akabak for beginers
dron driver...... not sure what you mean......

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7 years 10 months ago #16355 by ewantsang
Replied by ewantsang on topic Akabak for beginers

bee wrote: dron driver...... not sure what you mean......

sorry BEE, I miss a letter for this word, it is should be Drone.
BTW, I cannot fully understand the definte comments. i copy a script shown below, when i am running in acoustic pressurel, the AKABAK point out a warring as"the Def_const declaration can only apear once".


| Slit1.aks
Def_const
{t=15e-6; |Foil thickness
rho=2.685e-8; |resistivity for aluminium
HD=0.010; |Magnet gap width(m)
RD=0.009; |Ribbon width
WD=0.042; |Ribbon length
B=0.028; |Flux density in the airgap (T)
Mmd=1.52976e-5;|static ribbon mass(kg)
SD=(WD*HD); |Forces a rectangular radiator
l=WD; |ribbon length defines 1
Ree=rho*1/(RD*t); |resistance calculation
b1=0.0025; |back duct length
f1=0.0025; |front duct length
Vback=HD*WD*b1; |calcuation of real closed chamber

}


Def_Driver'ribbon'
Meas_DoNotModify

Re={Ree}
Mms={Mmd}
Bl={B*l}
fs=0.001Hz
Rms=0.3Ns/m
WD={WD}
HSD={HD}

System
Driver Def="ribbon"
Node=1=0=2=3

Duct 'silt'
Node=2=3
HD=0.5mm |Width of the silt
WD=84mm |double the length for each side!
Len=4.5mm |effective length of the silt
NoVisc


Duct 'front'
Node=2=4
HD={HD} WD={WD}
Len=(f1-(f1*0.425)} |end correction removed
NoVisc

Enclosure
Node=3
Vb={Vback}

Radiator Def="ribbon"
Node=2=0
HD={HD} WD={WD}


what is wrong with this script? could you please show methe right script for this simulation?
very thakns!

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7 years 10 months ago #16356 by bitzo
Replied by bitzo on topic Akabak for beginers
Radiator Def="ribbon"
Node=2=0
HD={HD} WD={WD}

I can't understand well how your cab should be however IMHO I guess radiator definition isn't correct.
should be

Radiator Def "ribbon"
Node=4
HD={HD} WD={WD}

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7 years 10 months ago #16366 by bee
Replied by bee on topic Akabak for beginers
nice one bitzo, thats the only error i can see, but mind you, im shattered so ill take another look in the morning...

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7 years 10 months ago #16386 by ewantsang
Replied by ewantsang on topic Akabak for beginers

bee wrote: nice one bitzo, thats the only error i can see, but mind you, im shattered so ill take another look in the morning...

bitze and Bee, thank you very much!
this script is a ribbon speaker,here is attached the origianl files for this script for you review.
Best Regards!
Attachments:

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7 years 10 months ago #16389 by bitzo
Replied by bitzo on topic Akabak for beginers
this one works like the comparison, the radiator connected to 0 means that the script take care of ground resonance.

Def_const
{t=15e-6; |Foil thickness
rho=2.685e-8; |resistivity for aluminium
HD=0.010; |Magnet gap width(m)
RD=0.009; |Ribbon width
WD=0.042; |Ribbon length
B=0.028; |Flux density in the airgap (T)
Mmd=1.52976e-5;|static ribbon mass(kg)
SD=(WD*HD); |Forces a rectangular radiator
l=WD; |ribbon length defines 1
Ree=rho*1/(RD*t); |resistance calculation
b1=0.0025; |back duct length
f1=0.0025; |front duct length
Vback=HD*WD*b1; |calcuation of real closed chamber
correction=f1-(f1*0.425);

}


Def_Driver 'ribbon'

Re={Ree}
Mms={Mmd}
Bl={B*l}
fs=0.001Hz
Rms=0.3Ns/m
WD={WD}
HD={HD}

System
Driver Def="ribbon"
Node=1=0=2=3

Duct 'silt'
Node=2=3
HD=0.5mm |Width of the silt
WD=84mm |double the length for each side!
Len=4.5mm |effective length of the silt
NoVisc


Duct 'front'
Node=2=4
HD={HD} WD={WD}
Len={correction}
NoVisc

Enclosure
Node=3
Vb={Vback}

Radiator Def="ribbon"
Node=2=0
HD={HD} WD={WD}

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7 years 10 months ago #16390 by ewantsang
Replied by ewantsang on topic Akabak for beginers

bitzo wrote: this one works like the comparison, the radiator connected to 0 means that the script take care of ground resonance.

Def_const
{t=15e-6; |Foil thickness
rho=2.685e-8; |resistivity for aluminium
HD=0.010; |Magnet gap width(m)
RD=0.009; |Ribbon width
WD=0.042; |Ribbon length
B=0.028; |Flux density in the airgap (T)
Mmd=1.52976e-5;|static ribbon mass(kg)
SD=(WD*HD); |Forces a rectangular radiator
l=WD; |ribbon length defines 1
Ree=rho*1/(RD*t); |resistance calculation
b1=0.0025; |back duct length
f1=0.0025; |front duct length
Vback=HD*WD*b1; |calcuation of real closed chamber
correction=f1-(f1*0.425);

}


Def_Driver 'ribbon'

Re={Ree}
Mms={Mmd}
Bl={B*l}
fs=0.001Hz
Rms=0.3Ns/m
WD={WD}
HD={HD}

System
Driver Def="ribbon"
Node=1=0=2=3

Duct 'silt'
Node=2=3
HD=0.5mm |Width of the silt
WD=84mm |double the length for each side!
Len=4.5mm |effective length of the silt
NoVisc


Duct 'front'
Node=2=4
HD={HD} WD={WD}
Len={correction}
NoVisc

Enclosure
Node=3
Vb={Vback}

Radiator Def="ribbon"
Node=2=0
HD={HD} WD={WD}

Hi dear bitzo,

Nice simulation! Very Grateful To You!

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7 years 9 months ago #16658 by ewantsang
Replied by ewantsang on topic Akabak for beginers
hi how are you Guys!
i have a query for the comperssion driver script descript in red word shown attached, could you please kindly help me how to solve?
Attachments:

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7 years 6 months ago #18057 by Thawach
Replied by Thawach on topic Akabak for beginers
i don't have the free time to read all the akabak pdf file. imagine this bin will try to write the script. but think a lot , is it good for pa? if not ill go to built by myself home use. thanks bee for ur thread.
Attachments:

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7 years 3 months ago #18805 by Silversurfer
Replied by Silversurfer on topic Akabak for beginers
Hey bee,
Hi bitzo,

have you found out a way to model a, for example midrange, horn which comprises a phase plug in the middle of the defined hornsectional areas without changing the outer dimensions of each horn throat/mouth circumferences, which otherwise would influence the frequency dependend directivity of the whole horn?

Help would be appreciated in advance!
Kindest regards

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