Nonlinear response of a multidirectional negative‐stiffness isolation system via semirecursive multibody dynamic approach

International Journal of Mechanical System Dynamics Pub Date : 2024-07-17 DOI:10.1002/msd2.12118

Wei Dai, Biagio Carboni, G. Quaranta, Yongjun Pan, W. Lacarbonara

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Abstract

This paper investigates an innovative negative‐stiffness device (NSD) that modifies the apparent stiffness of the supported structure for seismic isolation. The NSD comprises a lower base on the bottom and a cap on the top, together with a connecting rod, vertical movable wall, and compressed elastic spring, as well as circumferentially arranged, pretensioned external ropes, and inclined shape memory wires. This configuration can deliver negative stiffness and energy dissipation in any direction within the horizontal plane. A numerical model of the device is developed through a two‐step semirecursive method to obtain the force–displacement characteristic relationship. Such a model is first validated through comparison with the results obtained via the commercial software ADAMS. Finally, a large parametric study is performed to assess the role and the influence of each design variable on the overall response of the proposed device. Useful guidelines are drawn from this analysis to guide the system design and optimization.

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通过半递归多体动力学方法实现多向负刚度隔离系统的非线性响应

本文研究了一种创新的负刚度装置（NSD），它可以改变支撑结构的表观刚度，从而达到隔震效果。负刚度装置由底部的下基座和顶部的上盖组成，并配有连杆、垂直活动壁、压缩弹性弹簧、周向布置的预紧外绳和倾斜形状记忆线。这种结构可以在水平面内的任何方向提供负刚度和能量消耗。通过两步半递归法开发了该装置的数值模型，以获得力-位移特性关系。首先通过与商业软件 ADAMS 得出的结果进行比较，对该模型进行验证。最后，还进行了一项大型参数研究，以评估每个设计变量对拟议装置整体响应的作用和影响。从这一分析中得出有用的指导原则，以指导系统设计和优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Journal of Mechanical System Dynamics

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