The benefit of introducing nonlinear stiffness elements to improve the dynamic performance of vibration energy harvesters, vibration isolators and vibration absorbers have attracted great attention in the recent literature. A simple adjustable device to tailor nonlinear stiffness for diverse engineering applications is thus proposed in this paper. The device adopts two pairs of linear oblique springs, whose geometric arrangement can be modified to achieve specific nonlinear force-displacement characteristics. Depending on its design configuration, it is able to be adapted and behave as linear, hardening, softening, quasi-zero stiffness for large deflections, quasi-zero stiffness for small deflections, bi-stable and tri-stable. The design strategy and the main parameters involved are discussed.

引入非线性刚度元件以提高振动能量收集器、隔振器和减振器的动态性能的好处在最近的文献中引起了极大的关注。因此，本文提出了一种简单的可调节装置，用于为各种工程应用定制非线性刚度。该装置采用两对线性斜弹簧，其几何排列可以修改，以实现特定的非线性力-位移特性。根据其设计配置，它能够适应并表现为线性、硬化、软化、大挠度的准零刚度、小挠度的准零刚度、双稳态和三稳态。讨论了设计策略和涉及的主要参数。