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

Table 3

(3,1) mode peak vibration amplitude convergence for various excitation magnitudes (3 symmetric structural modes, ζ = 0.02).

No. of acoustic modes	κ = 0.05	0.2	0.5
1	66.4	70.3	76.2
4	67.5	75.2	80.2
6	101.2	96.2	96.9
7	100.0	100.0	100.0