光纤机敏结构振动形态感知及其SMA致动控制

Vibration Shape Perception and SMA Actuating Control of Fiber Optic Smart Structure

以模拟太空帆板结构为试验模型,针对振动状态监测与主动控制技术需求,着重进行柔性光纤机敏结构振动形态感知及其形状记忆合金(SMA)致动控制研究。技术方法上基于分布植入式FBG传感网络的信息感知特性与结构形态曲面拟合算法,实现结构分布多点曲率检测与形态重构,并为基于SMA致动的结构振动主动控制提供判决依据;基于结构表面分布配置的SMA驱动网络,采用分组交替驱动方式实现结构低阶模态大幅振动主动控制;设计试验模型结构与构建完整试验测控平台,并综合阐述了试验方案与试验过程。试验结果验证了结构振动形态感知的有效性,以及结构振动SMA致动控制的可行性和高效性,为航天柔性结构低阶模态振动主动监控提供了较好的技术探索思路。

According to the needs of structure vibration monitoring and active control technique, a research on fiber optic smart structure vibration shape perception and SMA actuating control was conducted by using space sailboard structure as an experimental model. Based on information perception characteristics of implantable distributed FBG sensor network and algorithm of structure shape surface fitting, the model structure distributed curvatures detection and structure shape reconstruction were realized, which provided a judgment basis for structure vibration active control by SMA driving. With SMA network allocated on structure's surface, active vibration control of the large amplitude of the first several normal modes of the structure was realized by the group alternate driving. An experimental model and a platform for measurement and control were designed and set up, and the experimental scheme and process were elaborated. Experiment results indicate that the structure vibration shape perception is effective and the SMA actuating control is feasible and effective, which provide technical exploration thoughts for the active vibration monitoring and control of the normal low modes of space flexible structures.