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Shock and Vibration
/
2019
/
Article
/
Tab 5
/
Research Article
Analytic Formula for the Vibration and Sound Radiation of a Nonlinear Duct
Table 5
Mode contribution at the (2,1) mode peak frequency (
κ
= 0.2,
ζ
= 0.02).
No. of acoustic modes
(2,1) mode
(4,1) mode
(6,1) mode
1
93.6
5.1
1.3
4
94.9
4.0
1.0
6
95.0
4.0
1.0
7
94.7
4.2
1.0