摘要
具有柔性特质的张力结构在各种动态激励的作用下将发生较高水平的振动,当这些振动超过一定限度时将对结构的功能与安全造成不利的影响,需要采取一定的措施加以控制。针对张力结构的动态控制问题展开研究,推导了张力结构的机电耦合控制方程,提出了结合Newmark算法的非线性瞬时最优控制算法(IOC)。分别采用线性二次型控制算法(LQR)与瞬时最优控制算法对索穹顶结构进行了主动控制模拟,比较了两种算法的控制效率,研究了作动器数量与布置位置对控制效果的影响。验证了张力结构的可控性,同时为张力结构主动控制中优化算法的选择及作动器的布置提供指导依据。
Tension structures are typical flexible structures which are apt to vibrate under various dynamic excitations.When the structural vibration is considerable large,it will affect the function and safety of the structure,thus vibration control of the structure is needed.A study on the dynamic control of tension structures is carried out.The electromechanical control equation of tension structures is formulated,and a nonlinear instantaneous optimal control algorithm is developed by introducing Newmark method.Active control of a cable dome with linear quadratic regulator and instantaneous optimal control is implemented respectively.A comparison between the control efficiencies of the two control algorithms is conducted.The effect of the number and layout of actuators to the control efficiency is investigated.The feasibility of the proposed methods used to control the vibration of tension structures is verified,and a guide to determine the number and layout of actuators is provided.
出处
《工程力学》
EI
CSCD
北大核心
2011年第5期186-193,共8页
Engineering Mechanics
基金
国家863计划项目(2007AA04Z441)
国家自然科学基金重点项目(50638050)
博士后科学基金项目(20090461384)
关键词
张力结构
动态控制
机电耦合
最优控制
索穹顶
tension structure
dynamic control
electromechanical coupling
optimal control
cable dome
