location-dependent performance analysis and dual-functional optimization of qzs vibration isolation systems integrated with energy harvesters

This study examines the co-optimization of energy harvesting and vibration suppression in quasi-zero stiffness (qzs) isolation systems. a multi-degree-of-freedom model is developed to analyze dual-functional optimization of vibration suppression and energy harvesting, incorporating harvester placement configurations. the harmonic balance method derives frequency-amplitude responses under external excitation, validated through runge-kutta numerical simulations. parametric studies assess stiffness/damping ratios and mass effects on system dynamics, emphasizing 1:3 internal resonance mechanisms. results reveal that upper-positioned harvesters enhance energy capture while preserving isolation performance. internal resonance excitation broadens operational bandwidth by amplifying nonlinear coupling effects between subsystems. the work establishes a framework for dual-functional qzs system optimization, targeting ultra-low-frequency vibration isolation coupled with energy harvesting capabilities, while providing theoretical insights for integrated mechanical-electrical design strategies.