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Total energy produced by sound source

  1. Feb 28, 2009 #1
    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.
     
  2. jcsd
  3. Feb 28, 2009 #2
    Last edited: Feb 28, 2009
  4. Mar 1, 2009 #3
    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.
     
  5. Mar 2, 2009 #4
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