Time-delayed decentralized H2/LQG controller for cable-stayed bridge under seismic loading (pages 354–372)

摘要

Consistency of real-time data transmission is an important factor in active and semi-active control of structures.nRecent advances in wireless sensors and their reliable data communication have attracted many attentions innstructural control engineering. Wireless sensors have been also preferred to wire-base types because of problemsnassociated with installing extensive length of coaxial wires. In addition, embedded computing technologies innwireless sensors as local controller reduce size of transferring data and provide stable transmission. However,nthere are some issues in implementation of wireless connection like communication range and latency. Thisnstudy presents the feasibility of developing a decentralized controller by using H2/LQG as robust-optimumnalgorithm in cable-stayed bridge. Because of large scale of structure, the order of model is reduced by usingntwo different reduction methods in finite time and frequency. The controller is developed in centralized andndecentralized solutions. The decentralized controller through developing a gradient-based method is designednto efficiently solve system of closed-loop H2 optimization problem. The structural responses in centralizednand decentralized solutions are compared with each other under three different earthquake records consideringntime delay in data transmission. Results indicate that for large-scale bridges with time-delayed data communicationnissue, H2/LQG controller in decentralized solution gives maximum reduction of response indices inncomparison with other strategies. Copyright © 2011 John Wiley & Sons, Ltd.