Design and Performance Analysis of an Origami‐Inspired Quasizero Stiffness Isolator With Lever Mechanisms

Vibration isolators are widely used to mitigate harmful vibrations in industrial machinery and electronic equipment, but low and ultralow frequency isolation remains challenging. Inspired by origami structures and lever mechanisms, a compact origami–lever quasizero‐stiffness (QZS) isolator is proposed in this paper, and its low frequency performance is experimentally verified. The origami geometry provides an adjustable negative stiffness that is counteracted by a tension spring mounted on a lever, thereby forming a near‐zero effective‐stiffness region. A nonlinear dynamic model is established, and the force transmissibility is derived using the harmonic balance method. Prototype tests under fixed and swept frequency excitations show a low resonant frequency and a distinct isolation band, with effective attenuation achieved above the isolation threshold. The measurements are found to accord with the intended QZS behavior and the “negative‐first, spring‐second” stiffness matching strategy is validated. The proposed architecture offers a compact, tunable, and easily parameterized solution for low frequency vibration isolation.