自适应桁架结构局部力反馈振动控制及其主动构件的配置研究

Active Vibration Control of Adaptive Truss Structures by a Local Direct Force Feedback and Optimal Placement of Piezoelectric Active Members

本文主要研究利用自适应桁架结构自身的主动构件实现控制结构动态特性的理论和有效性以及主动构件的最优配置问题。首先，基于自适应桁架结构的有限元模型，将主动构件的弹性内力直接用于实现反馈控制桁架结构的振动特性；然后，引用模态耗散能因子和模态应变能因子的概念，研究了主动构件的优化配置问题。通过一平面自适应桁架结构的优化配置计算和数值仿真，说明了文中提出的控制方法和主动构件优化配置的有效性。

The objective of this paper is to investigate the principle and effectiveness of active vibration control of adaptive truss structures using their active members and the optimal placements of the active members.Firstly,the finite element model of an adaptive truss structure containing piezoelectric active members is built,and the axial elastic internal force of active member elements is obtained.Then,the active members are controlled in a decentralized manner with a direct force feedback to realize a change in modal frequencies and modal damping of the structure.In order to find the optimal placements of the active member in the adaptive truss structure,an optimization criterion based on modal dissipation energy factor and modal strain engery factor is also developed in this paper.A planar adaptive truss structure is used as an example to demonstrate the effect of the presented approach in structural active vibration control.