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Negative Decibel Levels in Results
Posted 28.03.2017, 17:31 GMT-4 Acoustics & Vibrations, Results & Visualization Version 5.2a 2 Replies
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Hello,
I am running an acoustic analysis on a high frequency horn for a school project but my results are strange. It shows that as the air moves through the horn, the decibel levels quickly drop and once it is completely out of the mouth, the values become negative. Is there something wrong with my program? Any advice will help.
Thank you,
Cam
I am running an acoustic analysis on a high frequency horn for a school project but my results are strange. It shows that as the air moves through the horn, the decibel levels quickly drop and once it is completely out of the mouth, the values become negative. Is there something wrong with my program? Any advice will help.
Thank you,
Cam
2 Replies Last Post 28.03.2017, 22:30 GMT-4
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Posted:
8 years ago
I also cant make my velocity propagate explicitly through the horn, it sort of radiates outward. Any help with this will also be appreciated.
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Posted:
8 years ago
You need to understand the definition of dB
dB = 10 log (P/Pref)
if P < Pref dB < 0. Pref is an arbitrarily chosen reference level.
dB = 10 log (P/Pref)
if P < Pref dB < 0. Pref is an arbitrarily chosen reference level.