| Coupled-mode Zero-frequency mode or static divergence | Buckling | ||
Before flutter | β ≤ 0, ω > 0 | β ≤ 0, ω > 0 | β ≤ 0, ω > 0 | |
Flutter state | β1 = β2 = 0, ω1 = ω2 > 0 βi < 0, ωi > 0, i > 2 | β1 = β2 = 0, ω1 = ω2 > 0 βi < 0, ωi > 0, i > 2 | β1 = 0, βi¹1 < 0 ω1 = 0, ωi¹1 > 0 | |
After flutter | β1 = β2 > 0, ω1 = ω2 > 0 βi < 0, ωi > 0, i > 2 | β1 = β2 > 0, ω1 = ω2 > 0 βi < 0, ωi > 0, i > 2 | β1 > 0, βi¹1 < 0 ω1 = 0, ωi¹1 > 0 | |
Frequency | Ma? ω1? ω i¹1? | Ma? ω1? ω i¹1?then? | Ma? ω? | whenMa Nx? ω? |
Ma | Macr ≤ Maf | Macr ≤ Maf | Macr = Maf | |
Boundary conditions | SS, CC, FF, GG, SC | CF,SF,GF,CG,SG | GC, GS | SS, CC, FF, GG, SC, SF, CF, GF, GC, GS |