轴对称薄壁结构自由振动的边界元分析1)
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周琪, 陈永强
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FREE VIBRATION ANALYSIS OF THIN-WALLED AXISYMMETRIC STRUCTURES WITH BOUNDARY ELEMENT METHOD1)
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Zhou Qi,Chen Yongqiang
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| 表1 环向波数w = 0常规圆筒前五阶对称频率（# = 25). |
| Table 1 The first 5 symmetrical frequency of the general hollow |
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| | cylinder with n = | 0(N/ = | 25) | | | Order | NB = 8 | NB = 16 | NB = 32 | fem[31] | ssr[32] | Relative error/10-3 | | 1 | 1.813 56 | 1.814 15 | 1.814 44 | 1.816 1 | 1.815 2 | 0.41 | | 2 | 4.238 10 | 4.255 90 | 4.257 07 | 4.262 2 | 4.259 0 | 0.44 | | 3 | 4.569 28 | 4.587 09 | 4.587 85 | 4.608 5 | 4.569 3 | 4.00 | | 4 | 5.165 48 | 5.21211 | 5.221 00 | 5.257 2 | 5.245 0 | 4.60 | | 5 | 5.842 22 | 5.651 44 | 5.646 73 | 5.708 9 | 5.636 2 | 1.80 |
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