Dr. Yong Ding Profile

Dr. Yong Ding

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Proceedings Article | 11 April 2013 Paper

Output-only structural system identification method with a new two-stage Kalman filter and incomplete measurement

Y. Ding, B. Zhao, B. Wu

Proceedings Volume 8694, 869412 (2013) https://doi.org/10.1117/12.2010507

KEYWORDS: Earthquakes, System identification, Filtering (signal processing), Neodymium, Matrices, Numerical simulations, Computer simulations, Environmental sensing, Motion models, Error analysis

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In this paper, a two-stage time-variant structural system identification method is proposed based on incomplete structural acceleration responses. In the first stage, an external excitation identification method is developed for time-variant structural system. The unknown structural response could be re-constructed in state space and regularization method. In the second stage structural parameter is identified and updated by Extended Kalman Filter. The re-constructed structural response and identified external excitation are used in the second stage. The proposed method is validated numerically with the simulation of a fifteen-story shearing structure subject to earthquake excitation. A model of a fourteen-storey concrete shear wall building was studied experimentally with shaking table tests to further validate the proposed method. The shear wall structure has a two-storey steel frame on top with base isolation. Results from both numerical simulations and laboratory tests indicate that the proposed method can be used to identify structural parameter and external excitations effectively based on the structural acceleration responses. The proposed method is capable to identify the dynamic load and structural parameters fairly accurately with measurement noise, numerical model error and environmental disturbances.

Proceedings Article | 27 April 2011 Paper

Integration of structural control and structural evaluation for large scale structural system

Y. Ding, S. S. Law

Proceedings Volume 7977, 797724 (2011) https://doi.org/10.1117/12.880690

KEYWORDS: Control systems, System integration, Finite element methods, Damage detection, Smart structures, Reliability, Matrices, Earthquakes, Adaptive control, Systems modeling

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An integrated system of structural control and health monitoring can be implemented in modern smart structures with multi-purpose sensor system. The integration system not only promotes the reliability of the smart structure but also provides information on the condition of the smart structure. However, the on-line implementation of structural control and evaluation of a large scale structure are difficult due to the complicated calculation with large mass, damping and stiffness matrices. Moreover, the reliability of the structural control and evaluation results will also reduce in a large scale structural system during severe earthquake with centralized control system. In this paper, a new combined system of adaptive structural control and structural evaluation is proposed. The structural control system is implemented with the LQG control and the pseudo negative stiffness (PNS) control both are effective control methods for the vibration mitigation of structures. The structural control is adaptive with the updating of the structural parameters of the system via the structural evaluation system. A modified adaptive regularization method is used in the solution of the structural evaluation via model updating. The combination of the structural control and evaluation is designed as autonomous and decentralized to guarantee the reliability under the harsh environmental excitation. The autonomous decentralized control system explores a new substructure method which is more efficient in calculation with smaller mass, damping and stiffness matrices for the structural evaluation. The proposed integrated system is implemented and verified through numerical simulation of a 16-storey planar shear frame subject to seismic ground motion.

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