SEMI-ACTIVE CONTROL OF SUSPENSION STRUCTURES BY CHANGING THE LENGTH OF BOOMS
Suspension structure is generally composed of mega structures and suspension floors. An active variable stiffness system, which can provide a real-time and continuous change of the length of booms of suspension floors, is put forward. The system is used to change the length of suspension booms so as to change the elastic restoration forces between floors. The elastic restoration forces can work as the control forces for active variable stiffness systems as long as it is designed reasonably. So the active variable stiffness system is a semi-active control device. Based on the Linear-quadratic Regulator (or LQR) optimum control,the relationship between the active variable stiffness control forces and quadratic optimal control forces is established, and under the principle of keeping elastic restoration forces closest to or follow and realize LQR optimum active control forces,the algorithms of solving optimum elastic restoring forces can be deduced and obtained, and hereby a method which can solve the real-time optimum variation of length of booms is established. As the example analysis indicates, this active variable stiffness system works efficiently in suppressing response of suspension structure during earthquake, and has better controlling effects on the structural displacement and velocity reaction, but has no satisfactory effects on the suppressing acceleration responses.
Suspension structure Active variable length of suspension booms Active variable stiffness control
Wen-Wu Lan Bin-Ning Wei Xiu-Ning Peng Shu-Ying Wei
College of Civil Engineering, Guangxi University, Nanning 530004, P.R. China
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
1184-1188
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）