Semiactive Control of Vibrating Systems Using Electrorheological Fluids

该项目由美国国家科学基金会的“探索性研究小额资助(SGER)”计划支持，并由结构系统和施工过程及地震减灾计划联合支持。本项目的目的是探索电流变液(ER)作为结构振动半主动控制方案的可行性和适用性。该方法是使用一个简单的系统，其控制参数、阻尼和刚度系数依赖于电流变流体，通过控制电场来实时改变。采取了多学科方法，其中将进行实验和分析任务。分析模型考虑了这一问题的非线性动力学。基于Lyapunov稳定性理论的构造性应用，提出了一种非线性控制方案。这样的控制器在计算时间上是有效的(对于实时应用是必不可少的)，此外，还可以处理非线性动态。Er材料的表征和响应将使用实验装置进行测量。这项研究的一个重要成果，除了展示了结构振动半主动控制的优势外，还将为此类应用提供合适的电流变液要求的指导方针。本研究首次探讨了ER格式用于控制结构动力响应的可行性，并评估了其在解决地震、风振或机械振动问题方面的潜力。

This project is supported under NSF's "Small Grants for Exploratory Research (SGER)" Program and jointly by the Structural Systems and Construction Processes and Earthquake Hazard Mitigation Program. The objective of this project is to explore the feasibility and applicability of electrorheological fluids (ER) as a semiactive scheme for vibration control of structures. The approach is to use a simple system whose control parameters, damping and stiffness coefficients, dependent on the ER fluid, are varied in real time through control of the electric field. a multidisciplinary approach is undertaken in which both experimental and analytical tasks will conducted. The analytical model takes into account the nonlinear dynamics of this problem. A nonlinear control scheme will be developed, based on the constructive use of Lyapunov stability theory. Such a controller is efficient in computation time (essential for real time applications) and, in addition, handles nonlinear dynamics. ER materials characterization and response will be measured using the experimental arrangement. One important result of the research, in addition to demonstration the advantages of semiactive control for structural vibration, is that it will provide guidelines for the requirements of suitable ER fluids for such applications. This investigation explores, for the first time, the feasibility of ER scheme for use in controlling the dynamic structural response and assesses its potentials in solving seismic, wind, or machine-induced vibration problems.