Adaptation of Energy Dissipation in a Mechanical Metastable Module Excited Near Resonance

• DOI: 10.1115/1.4031411
• Publication Date: 2015-08-24T07:30:50Z
• Authors: N. Kidambi; R. L. Harne; K. W. Wang
• Keywords: Bistability; Metastability

Recent studies have demonstrated that the energetic vibrations of strategically designed negative stiffness inclusions may lead to large and adaptable damping in structural/material systems. Many researchers examine these features using models bistable elements. From viewpoint system integration, bistable, elements often interface with positive elastic members. Under such conditions, exhibit coexisting metastable states. In other words, macroscopic displacement/strain remains fixed while reaction force vary due internal change, similar a phase transition. This coexistence states is not manifested an individual (stand-alone) element. Although static low frequency linear dynamics systems possessing been explored, much be understood regarding energy dissipation characteristics when excited near resonance, where nonlinear are more easily activated design greater importance. Thus, effectively elucidate enhanced versatility properties afforded by exploiting systems, this research investigates mechanical module which leverages states: archetypal building block for assembly. The employ analytical, numerical, experimental findings probe how near-resonant excitation can trigger multiple dynamic states, each resulting distinct features. It shown that, lightly damped modules, effective varied across orders magnitude via tailoring parameters.