Helmholtz resonance airbox design?

In summary, to find the frequency of an airbox on a motorbike, you can use the formula f = w / 2pi = 160 sqrt( 116.5 A / VL ), where A is the area of the intake neck and V and L are the volume and length of the airbox, respectively. Using the given values of A, V, and L, the frequency can be calculated to be 26Hz. The second formula, f = ((343m/s) / 2PI) * SQRT( A / VL ), is not applicable in this scenario.
  • #1
GlynnHeeswijk
20
1
I have an airbox on a motorbike and want to find its frequency. I have two formulas:

f = w / 2pi = 160 sqrt( 116.5 A / VL )
and
f = ((343m/s) / 2PI) * SQRT( A / VL)

A = Area of intake neck = 5.67cm^2 or 5.67x10^-4m^2
V = Volume of airbox = 2500cc or 2.5x10^-3m^3
L = Length of intake neck = 10cm or 0.1m

I get the answers 26Hz for the first equation and 82Hz for the second. Which equation is correct?

The first formula is from http://www.calsci.com/motorcycleinfo/Airboxes.html
and the second is from wikipedia.
 
Last edited:
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  • #2
org.The correct answer is 26Hz using the first equation. The second equation is for calculating the speed of sound in air, not the frequency of the airbox.
 

1. What is Helmholtz resonance airbox design?

Helmholtz resonance airbox design is a method used to improve the sound characteristics of an airbox or enclosure by creating a resonant frequency that helps to eliminate unwanted noise and improve the overall sound quality.

2. How does Helmholtz resonance airbox design work?

Helmholtz resonance airbox design works by using a specially designed opening or port in the enclosure that is tuned to a specific frequency. This allows the air inside the enclosure to vibrate at the same frequency, canceling out unwanted noise and improving the sound quality.

3. What are the benefits of using Helmholtz resonance airbox design?

The main benefit of using Helmholtz resonance airbox design is the reduction of unwanted noise and improvement of sound quality. This method can also help to increase the efficiency of the airbox and improve the overall performance of the system.

4. Are there any limitations to Helmholtz resonance airbox design?

Yes, there are some limitations to Helmholtz resonance airbox design. One limitation is that it is only effective at reducing noise at a specific frequency, so it may not eliminate all unwanted noise. Additionally, the design and tuning of the airbox must be precise for it to be effective.

5. Can Helmholtz resonance airbox design be used in any type of enclosure?

Helmholtz resonance airbox design can be used in a variety of enclosures, such as speaker boxes, intake airboxes for engines, and even in industrial settings. However, the design and tuning will vary depending on the specific application and frequency that needs to be eliminated.

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