Conformation dynamics in asymmetric chain-like three-body bead-spring models

Abstract

We consider conformation dynamics of a chain-like three-body bead-spring model, in which three point masses are connected in series by two springs and the conformation is defined by the bending angle between the two springs. Previous studies have theoretically shown that an unstable (stable) conformation based on the potential function can be stabilized (destabilized) by exciting spring vibration and stabilization or destabilization depends on amplitudes of vibration modes. However, the system was restricted in symmetric cases in which the two springs are identical and the masses of the two end beads are identical. This symmetry simplifies energy exchange between the vibration modes and conformation dynamics accordingly. We extend the theory into asymmetric systems. This extension can induce nontrivial energy exchange between the modes and a corresponding nontrivial conformation dynamics.