Sound pressure levels to Third Octave bands
Sound pressure levels to Third Octave bands
(OP)
Dear all,
I'm working with acoustic predictions originating from CFD/computer simulations, and I readily have my acoustic results represented as sound pressure levels (dB). I end up with equally spaced frequencies, from 100 to 20,000 Hz with a step of 100 Hz for instance. I need to represent my results in third octave bands, and I have some doubts on the correct methods of summing/averaging for each different band. I find plenty of resources for addition of noise sources but this is quite different I think, should it be a log average or similar?
Any help would be greatly appreciated, or if you could point me to an appropriate resource?
Thank you in advance,
Kind Regards,
Nathan
I'm working with acoustic predictions originating from CFD/computer simulations, and I readily have my acoustic results represented as sound pressure levels (dB). I end up with equally spaced frequencies, from 100 to 20,000 Hz with a step of 100 Hz for instance. I need to represent my results in third octave bands, and I have some doubts on the correct methods of summing/averaging for each different band. I find plenty of resources for addition of noise sources but this is quite different I think, should it be a log average or similar?
Any help would be greatly appreciated, or if you could point me to an appropriate resource?
Thank you in advance,
Kind Regards,
Nathan
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RE: Sound pressure levels to Third Octave bands
https://bksv.com/~/media/literature/Product%20Data...
100 Hz res means you won't get anything meaningful until about 1000 Hz, you need 3 lines in each 1/3 octave.
Cheers
Greg Locock
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RE: Sound pressure levels to Third Octave bands
A simple rule of thumb (to check your calc) is that if you have two levels at X dB each, but at different frequencies, their combined level will be (X+3) dB.
Steve