Nonlinear Dynamics of an Electrorheological Sandwich Beam with Rotary Oscillation

Figure 7

Instability boundaries for various applied electric fields: curve a, 𝐸=0 kV/mm;  curve b, 𝐸=0.5 kV/mm;  curve c, 𝐸=1.0 kV/mm;  curve d, 𝐸=1.5 kV/mm;  curve e, 𝐸=2 kV/mm.

(a) First-order excited resonance

(b) Second-order excited resonance

(c) Combination resonance of difference types

(d) Combination resonance of sum types