NAFEMS FV22
Modal analysisPASS · 2.98%Clamped thick rhombic (skew) plate — Mindlin-regime bending modes (t/a = 0.1) on a highly skewed planform; checks transverse-shear behavior on distorted elements.
- Tolerance:
- 5%
Problem statement
- Geometry
- Rhombic plate, side 10 m, skew angle 45 degrees, thickness t = 1.0 m (thick plate, t/a = 0.1).
- Material
- Steel: E = 200 GPa, nu = 0.3, rho = 8000 kg/m^3.
- Boundary conditions
- All four edges fully clamped (w = 0 and both rotations fixed); in-plane motion constrained at all nodes (out-of-plane bending model).
- Measured quantity
- First five natural frequencies: 133.95, 201.41, 265.81, 282.74, 334.45 Hz (mode 6 is N.A. in TNSB).
Results comparison
| Reference value | 133.95201.41265.81282.74334.45 Hz (моды 1-5, TNSB-1990мода 6 в TNSB отсутствует) |
| Our result | 134.81205.36272.56286.72344.40 Hz |
| Deviation | 2.98% |
| Tolerance | 5% |
| Status | PASS · 2.98% |
| Element family | Shell element |
| Mesh details | MITC4-оболочки 48×48 (параллелограммные элементы), ромб 10×10×1.0 м (толстая, t/a=0.1), скос 45°, заделка по контуру, (lumped масса); лестница 24→32→48: мода 1 135.04 → 134.90 → 134.81 Гц, мода 5 345.43 → 344.83 → 344.40 Гц (сходится к эталону сверху) |
Updated: 2026-08-10 · WebCAE solver