Time Delay Effects on Bridge Structure Control

• Main Authors: Chu ,Chin Hung, 朱謹宏
• Other Authors: Wang,An Pei ; Chen,Yuan Liang
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/78290373229727777136

碩士 === 中原大學 === 土木工程研究所 === 83 === The object of this research is to investigate the effects of time delay on the control of a bridge structural system in which the fuzzy sliding mode control (FSMC) theory is used. The phase Shift method is applied to compensate for the phases lag due to time delay, and the two-level criterion of fuzzy control is proposed to reduce thechattering phenomenon caused by time delay, in order to obtain a control system which can converge rapidly and remain stable. The results of the numerical simulation show that the FSMC method can be applied to control a bridge structural system effectively.The difficulty in control due to time delay is improved by the phase shift method for compensation. The two- level criterion functions not only to increase the speed of the convergence of the control system, but also to reduce the back-and-forth around the equilibrium point in the on-off control system and avoid the waste of energy. The numerical results also show that regardless of whether the system has damping and regardless of the initial displacement, by using the control method proposed in this study when the delay time is less than 0.10 sec, the maximum and average displacements of the system can be reduced at least 50%, and the increase in displacement and the phenomenon of instability due to time delaycan be reduced to ensure the dynamic stability of the control system.