Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Negative Decibel Levels in Results
Posted 28 mar 2017, 17:31 GMT-4 Acoustics & Vibrations, Results & Visualization Version 5.2a 2 Replies
Please login with a confirmed email address before reporting spam
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 mar 2017, 22:30 GMT-4
Please login with a confirmed email address before reporting spam
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.
Please login with a confirmed email address before reporting spam
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.