Plate oscillations at M = 1.39 (the process is chaotic, with no specific mode dominated)
This movie shows elastic plate motion at M=1.39. Initially the plate oscillates in the first mode, later the second mode appears due to resonance. Little by little perturbations in the form of third, fourth and fifth mode shapes appear. In contrast to the first and second mode, oscillations in higher modes are not periodic. Due to nonlinear mode interaction the oscillations in the first and second modes lose periodicity and all the process becomes chaoticlike, with no specific mode dominated
Read more in Evolution of nonlinear panel flutter oscillations.