Sound Radiation Characteristics of a Rectangular Duct with Flexible Walls

Table 1

First ten uncoupled structural modes of a rectangular duct with a simply supported boundary condition calculated with proposed analytical and numerical model.

Mode	Analytical (Hz)	Numerical (Hz)
1	99.26	99.22
2	114.65	114.59
3	130.95	127.08
4	140.59	140.51
5	142.72	141.94
6	163.98	163.47
7	177.29	177.17
8	195.67	189.68
9	196.05	195.60
10	209.76	208.72