3D Global Weak-Form Mesh-Free Method for Acoustic Attenuation Analysis of Expansion Chambers

Table 3

Modal frequencies for expansion chamber with extended inlet from 3D weak-form MFM and 3D FEM.

Modal order		Modal frequencies		Relative errors (%)
		FEM	MFM
1	(0, 0, 1)	616.7	617.9	0.19
2	(0, 0, 2)	1208.9	1210.2	0.11
3	(1, 0, 0)	1236.3	1234.5	0.15
4	(1, 0, 1)	1405.1	1402.9	0.16
5	(1, 0, 2)	1768.3	1765.9	0.14
6	(0, 0, 3)	1821.5	1819.5	0.11
7	(2, 0, 0)	2162.4	2159.5	0.13
8	(1, 0, 3)	2233.1	2230	0.14
9	(2, 0, 1)	2248.6	2246.6	0.09
10	(0, 0, 4)	2444.8	2445.5	0.03
11	(2, 0, 2)	2500.1	2490.9	0.37
12	(1, 0, 4)	2756.1	2751.2	0.18
13	(0, 1, 0)	2767.2	2764.6	0.09
14	(2, 0, 3)	2843.4	2841.6	0.06
15	(0, 1, 1)	2930.2	2927.9	0.08