Aeroacoustic signals off by 20-30db compared to experimental data

zbyhu · August 6, 2013, 18:15

I am doing a noise simulation of an isolated airfoil, and when I looked at the results today they seem to be off by 20-30db. By character the plots are the same for experimental and cfd data, just offset. Do you know if there is something I might be forgetting about that is causing this?

Also it looks like the signals calculated in Fluent have to be A-weighted before being compared with microphone data, is that right?

I've uploaded some plots for reference here: http://imageupper.com/g/?S020001004U1375827073108508
(the ones where the SPL is higher are from the experiment)

edit: And here are all on one: experiment, simulation, simulation after a-weighting, and with +30dB.

cfduser99 · July 17, 2020, 13:08

Hello,

Were you able to solve this problem? If yes please tell us about it.

Thank you.

August 6, 2013, 18:15	Aeroacoustic signals off by 20-30db compared to experimental data	#1
zbyhu New Member Join Date: Apr 2012 Location: Warsaw, Poland Posts: 8 Rep Power: 14	I am doing a noise simulation of an isolated airfoil, and when I looked at the results today they seem to be off by 20-30db. By character the plots are the same for experimental and cfd data, just offset. Do you know if there is something I might be forgetting about that is causing this? Also it looks like the signals calculated in Fluent have to be A-weighted before being compared with microphone data, is that right? I've uploaded some plots for reference here: http://imageupper.com/g/?S020001004U1375827073108508 (the ones where the SPL is higher are from the experiment) edit: And here are all on one: experiment, simulation, simulation after a-weighting, and with +30dB. Last edited by zbyhu; August 6, 2013 at 19:48.

July 17, 2020, 13:08	Similar problem	#2
cfduser99 New Member Join Date: Dec 2017 Posts: 8 Rep Power: 8	Hello, Were you able to solve this problem? If yes please tell us about it. Thank you.

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