Large-Scale Hybird Semi-Active / Passive Base Isolation

本研究项目的目的是为混合半主动/被动基础隔震系统提供实验验证，该系统结合了低阻尼橡胶隔震器和具有可变刚度和阻尼特性的半主动控制元件。这项研究包括控制理论的发展、设备的发展、小规模的验证测试和大规模的测试。大规模的振动控制实验将与日本国家地球科学与防灾研究所（NIED）合作进行。这些实验将用于验证控制系统，该系统实现简单，对结构模型中的不确定性具有鲁棒性，需要很少的外部功率，并保证闭环稳定性。具有可调刚度和阻尼的构件可用于修改基础隔震结构的动力学。最优控制方法和基于李亚普诺夫直接法的控制规则将被研究。控制的目标是在不增加隔离质量的绝对加速度的情况下减少基础隔离系统的变形。这项研究的结果将为设计人员提供将可变性能材料（如ER材料）与被动基隔离和简单反馈控制相结合以限制隔离器偏转所需的知识。本项目为美国国家科学基金98-36项目“美日城市减灾合作研究”。

The objective of this research project is to provide experimental validation of a hybrid semi-active / passive base isolation system combining low-damping rubber isolators and semi-active control elements which exhibit variable stiffness and damping properties. This research involves control theory development, device development, small-scale verification tests, and large scale tests. The large-scale vibration control experiments will be carried out in collaboration with the Japanese National research Institute for Earth Science and Disaster Prevention (NIED). These experiments will be designed to validate the control system, which is simple to implement, robust to uncertainties in the structural model, requires very little external power, and has guaranteed closed loop stability.Members with adjustable stiffness and damping can be used to modify the dynamics of a base isolated structure. Optimal control methods, and control rules based on Lyapunov's direct method, will be investigated. The objective of the control will be to reduce deformation of the base isolation system without increasing absolute accelerations of the isolated mass. The results of this research will provide designers with the knowledge required to combine variable property materials (such as ER materials) with passive base isolation and simple feedback control to limit isolator deflections.This is a project under NSF 98-36, "US-Japan Cooperative Research in Urban Disaster Mitigation".