轴对称薄壁结构自由振动的边界元分析1)
周琪, 陈永强

FREE VIBRATION ANALYSIS OF THIN-WALLED AXISYMMETRIC STRUCTURES WITH BOUNDARY ELEMENT METHOD1)
Zhou Qi,Chen Yongqiang
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
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