THEORETICAL AND EXPERIMENTAL INVESTIGATION ON NOVEL NONLINEAR SUSPENSION BASED ON ORIGAMI METASTRUCTURE CONCEPT

Origami-type mechanical devices, initially designed for aerospace purposes due to their lightweight and foldable characteristics, exhibit unique nonlinear stiffness. Particularly, when suitably designed, they show Quasi-Zero Stiffness (QZS) characteristics within a specific performing range. The QZS property, aligned with the High Static Low Dynamic (HSLD) stiffness concept, brings an ideal passive vibration isolator to applications, especially for low-frequency vibrations. In this study, the vibration isolation capabilities of Origami-inspired suspensions, focusing on their viability as low-frequency passive vibration isolators, is investigated. Kresling Origami Module (KOM), stemmed from the compact design and compatibility with 3D printing technologies, is chosen. The investigation included a detailed analysis using 3D CAD, Finite Element Analysis, and experimental testing. The influence of geometric parameters on the nonlinear Force-Displacement curve is explored. Low-frequency isolation properties are confirmed by multibody simulations within the QZS region, but differences are recognized in dynamic properties beyond this range. The research underscored the transformative potential of Origami-type metamaterials in improving low-frequency vibration isolation technology. Challenges related to material properties and loading mass variations are discussed, providing valuable insights for future developments in this promising domain.