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Old 20th April 2008, 09:43 AM   #1
schmeet is offline schmeet  United Kingdom
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Default Driver Velocity

Hi guys,

If i have the driver velocity Ud.
how can i work out the pressure level from that?

I'm guessing its gotta be something like

Ud * Sd * p * c

Ud = Driver Velocity
Sd = Cone Area
p = Density of air
c = Speed of sound

I'm not quite sure though, does anyone have any ideas?



I'm calculating Ud (in an infinite baffle) using:
Ud = Pg / ((1 / jwCas) + jwMas + Rat)

Pg = Acoustic Driving Pressure = (eg Bl) / (ReSd)
Cas = Acoustic Compliance = Vas / (pc^2)
Mas = Acoustic Mass (not too sure how to calculate this?) Maybe (1 / (fs^2 * Cas))

Rad = (Bl^2 / Sd^2) * (Qes / (Re * Qms))
Rat = Total Acoustic Resistance = Rad + (Bl^2 / (Sd^2 (Re + jwLvc)))
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Old 20th April 2008, 04:14 PM   #2
bjorno is offline bjorno  Sweden
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Hi Pete,
Maybe this paper can give you a hint:


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