Application of Fuzzy Control to Structural Vibration Control

本研究旨在开发一种实用的减震系统，以降低结构在强震作用下的振动幅值。利用模糊控制的概念，可以用比通常方法更简单、更实用的方法来控制结构振动。此外，该系统还具有鲁棒性和适用性等优点。通过几个数值仿真实例，得出了用非常简单的模糊控制规则，将最大振幅降到原来的一半是可能的。特别是，只有关于速度的规则，可以提供令人满意的结果，如1自由度和2自由度模型的简单结构。由于模糊规则的隶属函数受结构振动特性的影响，确定最合适的隶属函数并不容易。今后，有必要进行全尺寸振动实验，以克服与实际应用相关的问题。

This study aims to develop a practical system which can reduce the amplitude of structural vibration due to the strong earthquake. Using the concept of fuzzy control, it is possible to control the structural vibration by a procedure simpler and more practical than the usual method. Moreover, this system may have such advantages as robustness and applicability. Through several numerical simulation examples, it is obtained that it is possible to reduce the maximum amplitude to the half of the original maximum amplitude by using very simple fuzzy control rules. Especially, only rules regarding velocity can provide satisfactory results for simple structures such as 1 freedom of degree and 2 freedom of degree models. It is not easy to determine the most appropriate membership functions for fuzzy rules, because they are influenced by the vibrational characteristics of structures under consideration. In future, it is necessary to conduct a full-scale vibration experiment in order to overcome problems associated with practical applications.