Vibration isolators with quasi-zero stiffness (QZS) property is an ideal solution for suppressing undesirable vibrations in engineering systems. Previous QZS isolators were mainly designed based on single-degree-of-freedom QZS structures without the capability for multi-directional vibration isolation. In this work, a Kresling-origami-inspired isolator (KOI) with QZS property in axial, torsional and coupled vibration is proposed. The KOI consists of two symmetric Kresling origami elements (KOEs), while a KOE is assembled by a base and an axial spring in parallel. Based on the static analysis, the bi-stability of bases is designed to provide negative stiffness. The QZS property of KOE is achieved by utilizing the special point Case-Q, which provides a novel strategy to design such an isolator. Such QZS property is only available for the KOE under axial or torsional excitation, while the KOI is further extended for isolating coupled excitations. The dynamic responses of KOI are calculated by solving its governing equations. Comparison between the theory results and those simulated in ADAMS shows good agreement. The transmissibility of the proposed isolator under axial and torsional vibration excitations is demonstrated to be able to achieve efficient vibration isolation performance, even full frequency range of vibration isolation for relatively weak excitations due to its nonlinearity. The developed theoretical framework and findings will provide a new way to design effective QZS isolators for multi-directional vibrations.

隔振器具有准零刚度 (QZS) 特性是抑制工程系统中不良振动的理想解决方案。以往的QZS隔振器主要基于单自由度QZS结构设计，不具备多向隔振能力。在这项工作中，提出了一种受 Kresling 折纸启发的隔离器 (KOI)，该隔离器在轴向、扭转和耦合振动方面具有 QZS 特性。KOI 由两个对称的 Kresling 折纸元件 (KOE) 组成，而 KOE 由底座和轴向弹簧平行组装而成。基于静态分析，底座的双稳定性被设计为提供负刚度。KOE 的 QZS 特性是通过利用特殊点 Case-Q 来实现的，这为设计此类隔离器提供了一种新颖的策略。这种 QZS 特性仅适用于轴向或扭转激励下的 KOE，而 KOI 则进一步扩展用于隔离耦合激励。通过求解其控制方程来计算 KOI 的动态响应。理论结果与模拟结果的比较ADAMS显示出良好的一致性。所提出的隔振器在轴向和扭转振动激励下的传递性被证明能够实现高效的隔振性能，甚至由于其非线性而对于相对较弱的激励实现全频率范围的隔振。所开发的理论框架和研究结果将为设计有效的多向振动 QZS 隔振器提供新方法。