Total energy produced by sound source

Hello,

I have measurements of the sound intensity produced by a sound source for a given frequency (*). These measurements were taken on on a grid on an imaginary sphere around the source. From these measurements it is clear that the sound intensity is not equal in all directions.

The measurements are calibrated in [tex]DB_{SPL}[/tex].

The problem: how can I get an estimate of the total energy dissipated by the source?

What I did so far is:
-for each point I calculate the area of the sphere that is covered by the point.
-I convert the DB values into intensity values: [tex]I = 10^{DB/10}[/tex].
-multiplying the Intensities in each point with the area of covered by the point
-summing all these numbers.
-to get an absolute intensity value, I multiply this number with 10^-12 (the sound pressure level base for calculating Db values).
-This number should give the number of WATTS. This should be multiplied with the duration the sound source is on.

The questions:
-So, is this correct?
-Is there a quick way to calculate the energy dissipated for example using a simple model for a source?

Regards,
Dieter




(*) The source produces more than 1 frequency of course. But let's start off easy.
 
Go to http://www.sengpielaudio.com/calculator-soundlevel.htm

This is an online calculator relating sound SPL's, Pascals (Newtons per square meter), and watts per square meter.
Thank you for the reply, but I knew about this site.

The problem is that it just gives a way to calculate Intensity ( = W/M² or J/M²S) from Decibel. It does not give a way to calculate Energy (W*Time) for non-uniform distribution of W in space.

So, that does not help me very much to solve my particular problem. But I agree that www.sengpielaudio.com is a top site.
 
4,662
5

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top