Miura-origami inspired quasi-zero stiffness low-frequency vibration isolator

Recent advances in nonlinear vibration isolation have revealed limitations in conventional linear isolators, yet existing nonlinear designs often lack adaptability to varying loads while maintaining effective low-frequency performance. To address these challenges, this paper introduces a novel linkage-type Miura-origami (LMO) vibration isolator incorporating quasi-zero stiffness (QZS) characteristics through an integrated origami structure and linear spring combination. The proposed system demonstrates unique parameter optimization capabilities that enable consistent QZS properties across multiple load conditions while preserving nonlinear stiffness characteristics. Analytical investigations employing the averaging method reveal superior vibration isolation performance, with the LMO system exhibiting broader isolation bandwidth and significantly reduce resonance peaks compared to equivalent linear isolators. Experimental validation through comprehensive dynamic testing under sweep frequency, harmonic, and random excitations confirms effective vibration attenuation above 1.6 Hz, with complete resonance peak suppression and 90 % root mean square reduction in the 1–25 Hz frequency band. These findings establish the LMO isolator as a promising solution for practical low-frequency vibration isolation applications, particularly in electromechanical systems where operational demands require both performance stability and load adaptability.