Table 7.
The natural oscillation frequency of PVS.
| Indicators | Mode | |||||
|---|---|---|---|---|---|---|
| No 1 | No 2 | No 3 | No 4 | No 5 | No 6 | |
| PVS with riffles in checkerboard arrangement (bh = 5 mm) | ||||||
| ωab, Hz | 60.78 | 90.31 | 139.49 | 294.35 | 429.99 | 610.84 |
| ωex, Hz | 62.44 | 88.37 | 135.93 | 284.69 | 443.44 | 600.31 |
| Δ, % | 2.73 | 2.14 | 2.55 | 3.28 | 3.13 | 1.72 |
| PVS with riffles in checkerboard arrangement (bh = 3.2 mm) | ||||||
| ωab, Hz | 58.98 | 81.59 | 120.82 | 263.24 | 401.05 | 588.38 |
| ωex, Hz | 56.64 | 78.5 | 122.19 | 258.43 | 411.56 | 566.28 |
| Δ, % | 3.96 | 3.78 | 1.13 | 1.82 | 2.62 | 3.75 |
| Base PVS (bh = 5 mm) | ||||||
| ωab, Hz | 53.87 | 66.88 | 89.52 | 210.03 | 342.2 | 516.76 |
| ωex, Hz | 55.38 | 68.625 | 86.38 | 206.88 | 336.25 | 499.93 |
| Δ, % | 2.80 | 2.60 | 3.50 | 1.5 | 1.73 | 3.25 |
| Base PVS (bh = 3.2 mm) | ||||||
| ωab, Hz | 46.95 | 61.65 | 86.68 | 197.07 | 310.04 | 459.65 |
| ωex, Hz | 45.36 | 59.43 | 84.43 | 197.81 | 304.9 | 443.15 |
| Δ, % | 3.38 | 3.60 | 2.59 | 0.37 | 1.65 | 3.58 |