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