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Help with equation calculation for helmholtz resonator
Old 7th October 2013
  #1
Here for the gear
 

Help with equation calculation for helmholtz resonator

Can someone provide a step by step process for calculate helmholtz resonance, if say im trying to calculate the port area instead of the frequency. Im not great with math but I want to learn and understand how to do this without online calculators.

this is the equation I am using.

Cavity Resonance

Also, no neck.
Old 8th October 2013
  #2
Gear Guru
 
Glenn Kuras's Avatar
See if the following program works for you.
mh-audio.nl - Acoustic
Caution they are not a silver bullet.
Old 8th October 2013
  #3
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Quote:
Originally Posted by Glenn Kuras View Post
See if the following program works for you.
mh-audio.nl - Acoustic
Caution they are not a silver bullet.
I guess that you misunderstand. I want to do the math myself.
Old 8th October 2013
  #4
Gear Guru
 
Glenn Kuras's Avatar
Quote:
Originally Posted by qaiphyx View Post
I guess that you misunderstand. I want to do the math myself.
Totally misread your post.
Old 8th October 2013
  #5
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L= Length of neck
Vo = Volume
A = Area of port
F = frequency obviously

L = 0
Vo = 473.17 (I think its cubed though I calculated it from 16 ounces, so it should be cubed right??)
A = What im solving for
F = 480 hz
V= speed of sound which is 340.19 at sea level

If Vo needs to be cubed then A should be squared, but I dont know if Im supposed to do that

Ive put all this down on paper and im not sure how to run this equation to solve especially when it comes to the square root of a fraction, especially if the fraction is cubed and squared.

How do I do this??? Been searching the internet for 2 days now trying to figure this out.
Old 9th October 2013
  #6
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adrumdrum's Avatar
 

Even if you want to do math I would still recommend to download "AcousticCalculator"(windows) from mh-audio.nl It will be much easier...
Old 7th August 2019
  #7
gte
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SoS = speed of sound at the approximated temperature

F = (SoS/2pi) * √(A / VL)

V = A / (L(F/(SoS/2pi)))^2

L = A / (V(F/(SoS/2pi)))^2

(VL) * (F/(SoS/2pi))^2 = A

Excel

C5 = area, C4 = length, C7 = frequency, C6 = The speed of sound

V=SUM(C5/(C4*(C7/(C6/(2*(22/7))))^2))

D5 = area, D3 = area, D7 = frequency, D6 = The speed of sound

L=SUM(D5/(D3*(D7/(D6/(2*(22/7))))^2))

E3 = area, E4 = length, E7 = frequency, E6 = The speed of sound

A=SUM(E3*E4) * (E7/(E6/(2*(22/7))))^2


Quote:
Originally Posted by qaiphyx View Post
Can someone provide a step by step process for calculate helmholtz resonance, if say im trying to calculate the port area instead of the frequency. Im not great with math but I want to learn and understand how to do this without online calculators.

this is the equation I am using.

Cavity Resonance

Also, no neck.
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