Sound Radiation Characteristics of a Rectangular Duct with Flexible Walls

Table 3

First ten uncoupled acoustic modes of a rectangular duct volume with rigid end condition.

Mode number	Analytical (Hz)	Numerical (Hz)
1	113.3	113.3
2	226.7	226.6
3	340	340
4	425	425
5	439.9	439.8
6	453.3	453.3
7	481.7	481.6
8	544.3	544.2
9	566.7	566.6
10	566.7	566.6