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首页> 外文期刊>Earthquake and structures: An International journal of earthquake engineering & earthquake effects on structures >Magnetorheological elastomer base isolator for earthquake response mitigation on building structures: modeling and second-order sliding mode control
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Magnetorheological elastomer base isolator for earthquake response mitigation on building structures: modeling and second-order sliding mode control

机译：磁流变弹性体基础隔离器，用于缓解建筑结构的地震响应：建模和二阶滑模控制

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摘要

Recently, magnetorheological elastomer (MRE) material and its devices have been developed and attracted a good deal of attention for their potentials in vibration control. Among them, a highly adaptive base isolator based on MRE was designed, fabricated and tested for real-time adaptive control of base isolated structures against a suite of earthquakes. To perfectly take advantage of this new device, an accurate and robust model should be built to characterize its nonlinearity and hysteresis for its application in structural control. This paper first proposes a novel hysteresis model, in which a nonlinear hyperbolic sine function spring is used to portray the strain stiffening phenomenon and a Voigt component is incorporated in parallel to describe the solid-material behaviours. Then the fruit fly optimization algorithm (FFOA) is employed for model parameter identification using testing data of shear force, displacement and velocity obtained from different loading conditions. The relationships between model parameters and applied current are also explored to obtain a current-dependent generalized model for the control application. Based on the proposed model of MRE base isolator, a second-order sliding mode controller is designed and applied to the device to provide a real-time feedback control of smart structures. The performance of the proposed technique is evaluated in simulation through utilizing a three-storey benchmark building model under four benchmark earthquake excitations. The results verify the effectiveness of the proposed current-dependent model and corresponding controller for semi-active control of MRE base isolator incorporated smart structures.
机译：近年来，磁流变弹性体（MRE）材料及其设备已经得到开发，并因其在振动控制方面的潜力而引起了广泛的关注。其中，设计，制造和测试了基于MRE的高度自适应基础隔振器，以针对一系列地震对基础隔震结构进行实时自适应控制。为了完全利用这种新设备，应该建立一个准确而健壮的模型来表征其非线性和滞后特性，以用于结构控制。本文首先提出了一种新颖的磁滞模型，其中非线性双曲正弦函数弹簧用于刻画应变刚度现象，并与Voigt分量并行地描述了固体材料的行为。然后使用果蝇优化算法（FFOA），利用从不同载荷条件获得的剪切力，位移和速度的测试数据，对模型参数进行识别。还探索了模型参数与施加的电流之间的关系，以获得用于控制应用的电流相关的广义模型。基于所提出的MRE基础隔离器模型，设计了一种二阶滑模控制器并将其应用于该设备，以提供智能结构的实时反馈控制。通过在三项基准地震激励下利用三层基准建筑模型在仿真中评估了所提出技术的性能。结果验证了所提出的电流相关模型和相应的控制器对MRE基础隔离器集成智能结构的半主动控制的有效性。

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