Shock and Vibration / 2020 / Article / Tab 3

Research Article

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 orderModal frequenciesRelative errors (%)
FEMMFM

1(0, 0, 1)616.7617.90.19
2(0, 0, 2)1208.91210.20.11
3(1, 0, 0)1236.31234.50.15
4(1, 0, 1)1405.11402.90.16
5(1, 0, 2)1768.31765.90.14
6(0, 0, 3)1821.51819.50.11
7(2, 0, 0)2162.42159.50.13
8(1, 0, 3)2233.122300.14
9(2, 0, 1)2248.62246.60.09
10(0, 0, 4)2444.82445.50.03
11(2, 0, 2)2500.12490.90.37
12(1, 0, 4)2756.12751.20.18
13(0, 1, 0)2767.22764.60.09
14(2, 0, 3)2843.42841.60.06
15(0, 1, 1)2930.22927.90.08

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