Substructure identification for shear structures II: Controlled substructure identification

作者：Zhang Dongyu; Johnson Erik A^*

来源：Structural Control and Health Monitoring, 2013, 20(5): 821-834.

DOI：10.1002/stc.1498

• controlled identification
• system identification
• shear structures
• error analysis
• structural control

The companion paper proposed a substructure identification method for shear structures and derives the method's error analysis, demonstrating that the identification errors are closely related to two important structural responses: (i) the frequency response of the interstory acceleration of the identified story and (ii) the frequency response ratio between interstory accelerations of two adjacent stories. The identification accuracy of this substructure method can be improved by amplifying the first response and reducing the second response near the substructure natural frequency. Herein, a controlled substructure identification method is proposed, which utilizes two kinds of structural control systems, an active mass driver system, and a passive interstory brace system, to temporarily shift the system dynamics to improve the accuracy of parameter identification. The optimal parameters of two control systems are obtained by solving specially designed optimization problems. Because the accuracy of the controlled substructure identification does not directly depend on complex modal properties of the closed-loop controlled structure but only on the controlled structural responses, the controlled substructure identification method is quite robust to control system errors. Numerical simulations demonstrate that both control methods did greatly improve the accuracy of the identification and were robust to fairly large feedback measurement noise.

• 出版日期2013-5
• 单位哈尔滨工业大学