模型降阶对桥梁主动控制的稳定性及误差分析

Analysis of Stability and Error of Active Control for Longitudinal Vibration Response of Bridge Adopted Model Reduction

以天兴洲公铁两用斜拉桥为工程背景,从理论和实践上对桥梁结构降阶模型的列车制动响应主动控制的稳定性和误差影响进行研究。结果表明:采用模态降阶技术,当保留一定数量模态后,桥梁结构的主动控制是稳定的,并且误差影响很小;同时,采用主动控制完全能够有效抑制其主梁纵向列车制动响应。

The stability and error of the reduced model have been analyzed from theory and experience based on Wuhan Tian Xingzhou highway and railway combined cable-stayed bridge,and the active control for responses in deck of it induced by train braking have been simulated.The results indicate that when a sufficient number of modals are included in the model,the reduced modal is stable and the influence is very small.Meanwhile,LQR active control algorithm can effectively resist the responses in deck of this reduced modal induced by train braking.