Analytic Formula for the Vibration and Sound Radiation of a Nonlinear Duct

Table 6

Mode contribution at the (3,1) mode peak frequency (κ = 0.2, ζ = 0.02).

No. of acoustic modes	(1,1) mode	(3,1) mode	(5,1) mode
1	0.3	95.6	4.1
4	0.2	95.8	4.0
6	0.2	96.3	3.5
7	0.2	96.4	3.4