Summary
This work explores the implementation of the intermodal targeted energy transfer (IMTET) mechanism for passive mitigation of a three-dimensional non-symmetric linear oscillator subjected to blast excitation. We consider a mechanism for redistribution of the excitation energy among the oscillatory modes. The model under consideration is a three-dimensional rigid mass with six degrees-of-freedom - three independent directions of translation, and three independent rotational directions. To achieve the IMTET behavior, a half ellipsoidal cavity is introduced at the bottom of the mass. In addition, the vibro-impacts are achieved by placing a fixed rigid rod, which its tip is located inside the mass, in the ellipsoidal cavity. At rest, the center of mass coincides with the tip of the rigid rod. Asymmetry is introduced by placing the ellipsoidal cavity at the bottom of the mass. The impacts between the rigid rod and the cavity are the only nonlinear interactions in the system; between the impacts, the dynamics will be assumed linear, for the sake of simplicity. Profound IMTET with substantial decrease of the characteristic damping time is observed.
