Free Vibrations of a Trapezoidal Plate with an Internal Line Hinge

Figure 3

Variation of the fundamental frequency parameters Ω^∗=𝜔/(2𝜋)𝑙²𝜌ℎ/𝐷₀ with respect to the position of the line hinge 𝑐_𝑙 for isosceles triangular isotropic plates with different boundary conditions (tan𝛼₁=−tan𝛼₂=0.5, 𝑅₁₂=0).