Quasi-zero stiffness (QZS) isolators can achieve the two goals of relatively high static and low dynamic stiffness (HSLDS). However, the static and dynamic stiffness of most QZS isolators remains coupled, causing conflicts in optimizing these dual objectives, especially in the case of large displacement excitations and heavy loads, leading to limited performance. To overcome these limitations, this paper presents an isolator with an extended QZS region that allows for the independent design of HSLDS. The positive stiffness provided by the cantilever beam with curve fixture (CBCF) precisely counteracts the negative stiffness offered by a pair of inclined springs, thereby achieving continuous and extensive QZS characteristics from a point to a region. Dynamic equations are established based on the Lagrangian principle and swiftly solved utilizing the Runge-Kutta-4 method. The proposed isolator exhibits a low resonance frequency, and superior performance when exposed to large displacement excitations compared to alternative isolators. Both static and dynamic experiments confirm a QZS region of 0.023 m and resonance frequencies of below 1 Hz. The proposed isolator facilitates effective vibration isolation for ultra-low-frequency and large displacement excitations.

中文翻译：

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宽准零刚度区域隔离器，具有解耦的高静态刚度和低动态刚度

准零刚度（QZS）隔振器可以实现相对较高的静态刚度和较低的动态刚度（HSLDS）两个目标。然而，大多数 QZS 隔振器的静态和动态刚度仍然耦合，导致优化这些双重目标时发生冲突，特别是在大位移激励和重负载的情况下，导致性能有限。为了克服这些限制，本文提出了一种具有扩展 QZS 区域的隔离器，允许独立设计 HSLDS。带有曲线夹具的悬臂梁（CBCF）提供的正刚度精确地抵消了一对倾斜弹簧提供的负刚度，从而实现从点到区域的连续和广泛的QZS特性。动力学方程基于拉格朗日原理建立，并利用 Runge-Kutta-4 方法快速求解。与替代隔离器相比，所提出的隔离器在受到大位移激励时表现出低谐振频率和优越的性能。静态和动态实验均证实 QZS 区域为 0.023 m，共振频率低于 1 Hz。所提出的隔离器有助于对超低频和大位移激励进行有效的振动隔离。