A 3D Multiport Scattering Matrix Based-Method for Educing Wall Impedance of Cylindrical Lined Duct Section: Simulation and Error Evaluation

Table 1

Source and load configurations 𝜃_𝑠, 𝑟=𝑎, 𝑧_𝑠, cylindrical coordinates of the source, and 𝐸_𝑏 the load length.

Configuration number	𝜃𝑠 (°)	𝑧𝑠(cm)	𝐸𝑏(cm)
1	0	0	0
2	120	+ 15	6
3	240	– 15	9
4	8.5	0	18
5	128.5	+ 15	0
6	248.5	– 15	6
7	17	0	9
8	137	+ 15	18
9	257	– 15	0
10	25.5	0	6
11	145.5	+ 15	9
12	265.5	– 15	18
13	34	0	0
14	154	+ 15	6
15	274	– 15	9
16	42.5	0	18
17	162.5	+ 15	0
18	282.5	– 15	6
19	51	0	9
20	171	+ 15	18