非线性粘弹性隔震减震
Nonlinear viscoelastic isolation for seismic vibration mitigation
摘要：
本文的目的是评估非线性粘弹性阻尼控制基础激励振动的有效性。具体而言，重点是调查的非线性基础隔震性能的鲁棒性控制系统响应由于广泛的一组可能的激励谱。动力学模型推导研究一个简单的结构，其基础隔震提供通过橡胶层滚动轴承（RLRB）（刚性圆柱体上滚动的刚性板与高阻尼橡胶涂层）配备了一个非线性立方弹簧，从而呈现非线性阻尼和刚度。我们发现，在周期性载荷下，由于非单调的钟形粘弹性阻尼所产生的粘弹性滚动接触，不同的动态政权发生主要取决于是否克服或不阻尼峰值。有趣的是，在前一种情况下，阻尼很差的自激振动可能会被急剧的阻尼降低所触发。此外，为了研究隔振性能的鲁棒性，我们考虑了一组真实地震激励，表明与通用线性隔振器相比，调谐非线性RLRB在更广泛的激励谱范围内提供负载隔振。这是特别适合的应用程序（如地震和故障工程），其中具体的激励频谱是未知的先验，和盲目的设计统计数据，必须采用。
英文摘要：
The aim of this paper is to assess the effectiveness of nonlinear viscoelastic damping in controlling base-excited vibrations. Specifically, the focus is on investigating the robustness of the nonlinear base isolation performance in controlling the system response due to a wide set of possible excitation spectra. The dynamic model is derived to study a simple structure whose base isolation is provided via a Rubber-Layer Roller Bearing (RLRB) (rigid cylinders rolling on rigid plates with highly damping rubber coatings) equipped with a nonlinear cubic spring, thus presenting both nonlinear damping and stiffness. We found that, under periodic loading, due to the non-monotonic bell-shaped viscoelastic damping arising from the viscoelastic rolling contacts, different dynamic regimes occur mostly depending on whether the damping peak is overcome or not. Interestingly, in the former case, poorly damped self-excited vibrations may be triggered by the steep damping decrease. Moreover, in order to investigate the robustness of the isolation performance, we consider a set of real seismic excitations, showing that tuned nonlinear RLRB provide loads isolation in a wider range of excitation spectra, compared to generic linear isolators. This is peculiarly suited for applications (such as seismic and failure engineering) in which the specific excitation spectrum is unknown a priori, and blind design on statistical data has to be employed.
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