Extremely low dynamic stiffness is essential for the successful utilization of quasi-zero stiffness (QZS) structures for vibration isolation, energy harvesting, and micromechanical sensing. However, most conventional QZS structures are based on a parallel connection of positive and negative stiffness mechanisms, which poses challenges for stiffness matching, structure design, and fabrication. We propose a QZS structure based on a straight-arch-straight (SAS) tandem connection, in which the integrated design of the structure overcomes the problem of stiffness matching, and more importantly, the simple design of the structure greatly reduces the difficulty of fabrication and enables the design of a wide range of load-carrying capacity by only adjust the ratio of the length of the straight beam to the arch and the ratio of the height of the arch to the thickness. The symmetric deformation of the SAS structure extends the working range of the QZS structure, which can be further extended several times or divided into several different QZS intervals by connecting several identical or different SAS units in parallel. The experimental results show that the SAS structure has excellent vibration isolation performance in the low-frequency region, and more importantly, the low preload requirement also provides an important reference for structural design in the field of micromechanical sensing.

中文翻译：

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一种直-拱-直梁串联准零刚度结构


极低的动态刚度对于成功利用准零刚度 （QZS） 结构进行隔振、能量收集和微机械传感至关重要。然而，大多数传统的 QZS 结构都是基于正刚度和负刚度机制的并联连接，这给刚度匹配、结构设计和制造带来了挑战。我们提出了一种基于直-拱-直（SAS）串联连接的QZS结构，其中结构的集成设计克服了刚度匹配的问题，更重要的是，结构的简单设计大大降低了制造难度，只需调整直梁与拱的长度比和直梁的高度比值，就可以设计出很宽范围的承载能力。拱到厚度。SAS 结构的对称变形扩展了 QZS 结构的工作范围，通过并联几个相同或不同的 SAS 单元，可以进一步扩展数倍或分成几个不同的 QZS 间隔。实验结果表明，SAS结构在低频区具有优异的隔振性能，更重要的是，低预紧要求也为微机械传感领域的结构设计提供了重要参考。