|
| Number of sides to be clamped | clamped edges | Improvement of frequencies with respect to simply supported shells | Marks indicating the efficiencies of clamping |
|
| 0 | Simply supported no edges clamped (SSSS) | — | 0 |
|
| (a) Along (CSSS) | Slight improvement | 13 |
| (b) along (SSCS) | Slight improvement | 13 |
| (c) along (SSSC) | Slight improvement | 13 |
| 2 | (a) Two alternate edges (CSCS, SCSC) | Good improvement | 28 |
| (b) Two adjacent edges (CSSC, CCSS) | Marked improvement | 82 |
| 3 | 3 edges excluding CSCC | Remarkable improvement and frequency becomes almost equal to that of fully clamped shells | 94 |
| 3 edges excluding CCSC | 92 |
| 3 edges excluding CCCS | 93 |
| 4 | All sides (CCCC) | Frequency attains a maximum value | 100 |
|