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Optimal design of an equipment isolation system with nonlinear hysteretic behaviour

机译：具有非线性滞后特性的设备隔离系统的优化设计

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摘要

Vibration isolation is well recognized as an effective mitigation strategy for acceleration-sensitive equipment subjected to earthquake. In the present paper, an equipment isolation system with nonlinear hysteretic behaviour is proposed and a methodology for the optimal design is developed. An integrable constitutive model, derived from the mathematical Duhem hysteresis operator, is adopted for the isolation system. The optimization procedure is defined through a dual-criteria approach that involves a transmissibility criterion combined with an energy performance criterion: the former consists in limiting the absolute acceleration of the isolated equipment below an allowable threshold value; the latter, in maximizing the ratio between the energy dissipation due to hysteresis and the input energy to reduce the isolator displacements. The seismic effectiveness of the nonlinear hysteretic isolation system is numerically investigated under natural accelerograms with different frequency content and increasing levels of excitation. Both ground-mounted and floor-mounted equipment items are considered in the analyses; in the second case, the dynamic interaction between the equipment and its supporting structure is taken into account in the design of the isolation system, and its effects on the isolation performance and the structural response are discussed. Comparisons in terms of effectiveness and robustness with a linear isolation system with viscoelastic behaviour are eventually provided.
机译：振动隔离是缓解地震的加速度敏感设备的有效缓解策略。本文提出了一种具有非线性滞后特性的设备隔离系统，并提出了一种优化设计的方法。隔离系统采用源自数学Duhem磁滞算子的可积本构模型。优化程序是通过双重标准方法定义的，该方法包含可传输性标准和能源绩效标准：前者在于将隔离设备的绝对加速度限制在允许的阈值以下；后者是为了最大程度地增加磁滞引起的能量耗散与输入能量之间的比率，以减少隔离器的位移。在具有不同频率含量和增加激励水平的自然加速度图下，对非线性滞后隔振系统的抗震效果进行了数值研究。分析中考虑了地面设备和地面设备。在第二种情况下，隔离系统的设计考虑了设备及其支撑结构之间的动态相互作用，并讨论了其对隔离性能和结构响应的影响。最终提供了在有效性和鲁棒性方面具有线性隔离特性的线性隔离系统的比较。

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