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

Table 4

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

No. of acoustic modes	(1,1) mode	(3,1) mode	(5,1) mode
1	95.6	3.1	1.2
4	96.2	2.7	1.1
6	95.8	3.1	1.1
7	95.8	3.1	1.1