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Dynamic behavior of stay cables with passive negative stiffness dampers

机译：带有被动负刚度阻尼器的斜拉索的动态行为

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摘要

This paper systematically investigates the dynamic behavior of stay cables with passive negative stiffness dampers (NSD) installed close to the cable end. A passive NSD is modeled as a combination of a negative stiffness spring and a viscous damper. Through both analytical and numerical approaches, parametric analysis of negative stiffness and viscous damping are conducted to systematically evaluate the vibration control performance of passive NSD on stay cables. Since negative stiffness is an unstable element, the boundary of passive negative stiffness for stay cables to maintain stability is also derived. Results reveal that the asymptotic approach is only applicable to passive dampers with positive or moderate negative stiffness, and loses its accuracy when a passive NSD possesses significant negative stiffness. It has been found that the performance of passive NSD can be much better than those of conventional viscous dampers. The superior control performance of passive NSD in cable vibration mitigation is validated through numerical simulations of a full-scale stay cable.
机译：本文系统地研究了安装在电缆末端附近的带有被动负刚度阻尼器（NSD）的斜拉索的动态行为。被动NSD建模为负刚度弹簧和粘性阻尼器的组合。通过分析和数值方法，对负刚度和粘性阻尼进行参数分析，以系统地评估被动NSD在斜拉索上的振动控制性能。由于负刚度是一个不稳定的因素，因此还得出了用于保持电缆稳定性的被动负刚度的边界。结果表明，渐近方法仅适用于具有正或中等负刚度的被动阻尼器，而当被动NSD具有显着的负刚度时，渐进方法会失去其准确性。已经发现，被动式NSD的性能可以比传统的粘性阻尼器好得多。通过对全尺寸斜拉索进行数值模拟，可以验证无源NSD在减轻电缆振动方面的优越控制性能。

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