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

Table 2

Modal frequencies of expansion chamber from 3D weak-form MFM and 3D FEM.

Modal order		Modal frequencies		Relative errors (%)
		FEM	MFM
1	(0, 0, 1)	602.3	604.2	0.31
2	(0, 0, 2)	1204.2	1207.9	0.31
3	(1, 0, 0)	1307.7	1313.9	0.47
4	(1, 0, 1)	1441.2	1445.3	0.28
5	(1, 0, 2)	1778.9	1783.0	0.23
6	(0, 0, 3)	1805.1	1809.4	0.24
7	(2, 0, 0)	2157.2	2164.3	0.33
8	(1, 0, 3)	2229.9	2229.6	0.01
9	(2, 0, 1)	2239.6	2245.7	0.27
10	(0, 0, 4)	2402.5	2404.4	0.08
11	(2, 0, 2)	2470.5	2477.2	0.27
12	(0, 1, 0)	2735.3	2732.7	0.10
13	(1, 0, 4)	2736.0	2740.4	0.16
14	(0, 1, 1)	2776.5	2776.8	0.01
15	(2, 0, 3)	2812.8	2814.1	0.05