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A semi-active H∞ control strategy with application to the vibration suppression of nonlinear high-rise building under earthquake excitations.

Yan G, Chen F, Wu Y - Springerplus (2016)

Bottom Line: In this strategy, a modified Kalman-Bucy observer which is suitable for the proposed semi-active strategy is developed to obtain the state vector from the measured semi-active control force and acceleration feedback, taking into account of the effects of nonlinearity, disturbance and uncertainty of controlled system parameters by the observed nonlinear accelerations.It is indicated that the proposed semi-active H∞ control strategy provides much better control performances by comparison with the semi-active MPC and Clipped-LQG control approaches, and can reduce nonlinear seismic response and minimize the damage in the buildings.Besides, it enhances the reliability of the control performance when compared with the active control strategy.

View Article: PubMed Central - PubMed

Affiliation: Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Department of Civil Engineering, Fujian University of Technology, Fuzhou, 350118 China.

ABSTRACT
Different from previous researches which mostly focused on linear response control of seismically excited high-rise buildings, this study aims to control nonlinear seismic response of high-rise buildings. To this end, a semi-active control strategy, in which H∞ control algorithm is used and magneto-rheological dampers are employed for an actuator, is presented to suppress the nonlinear vibration. In this strategy, a modified Kalman-Bucy observer which is suitable for the proposed semi-active strategy is developed to obtain the state vector from the measured semi-active control force and acceleration feedback, taking into account of the effects of nonlinearity, disturbance and uncertainty of controlled system parameters by the observed nonlinear accelerations. Then, the proposed semi-active H∞ control strategy is applied to the ASCE 20-story benchmark building when subjected to earthquake excitation and compared with the other control approaches by some control criteria. It is indicated that the proposed semi-active H∞ control strategy provides much better control performances by comparison with the semi-active MPC and Clipped-LQG control approaches, and can reduce nonlinear seismic response and minimize the damage in the buildings. Besides, it enhances the reliability of the control performance when compared with the active control strategy. Thus, the proposed semi-active H∞ control strategy is suitable for suppressing the nonlinear vibration of high-rise buildings.

No MeSH data available.


Related in: MedlinePlus

Distribution of permanent interstory drift ratio. a Full-scale Northridge; b full-scale Kobe
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Fig6: Distribution of permanent interstory drift ratio. a Full-scale Northridge; b full-scale Kobe

Mentions: To further discuss this issue, Fig. 6 depicts the permanent drift ratio response for the full-scale intensity Kobe and Northridge earthquakes. Although the maximum permanent drift ratio from the first floor to the third floor of the structure is somewhat larger for the semi-active H∞ control strategy under full-scale Northridge earthquake, the permanent offset at each floor in the controlled structure is usually a small part of the uncontrolled structure. In other floors, the permanent drift ratio is reduced effectively. Note that the semi-active H∞ control strategy performs much better than the other two schemes. In the case of full-scale Kobe earthquake, the permanent offset of the controlled structure is generally greatly smaller than that of the uncontrolled structure throughout all floors, and the control effect of the semi-active H∞ control strategy on the permanent offset is a little better than that of the other two strategies. Additionally, the evaluation criteria J4 in Table 2 is above 1.0 for the full-scale Northridge earthquake because of the existence of the permanent offset.Fig. 6


A semi-active H∞ control strategy with application to the vibration suppression of nonlinear high-rise building under earthquake excitations.

Yan G, Chen F, Wu Y - Springerplus (2016)

Distribution of permanent interstory drift ratio. a Full-scale Northridge; b full-scale Kobe
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940326&req=5

Fig6: Distribution of permanent interstory drift ratio. a Full-scale Northridge; b full-scale Kobe
Mentions: To further discuss this issue, Fig. 6 depicts the permanent drift ratio response for the full-scale intensity Kobe and Northridge earthquakes. Although the maximum permanent drift ratio from the first floor to the third floor of the structure is somewhat larger for the semi-active H∞ control strategy under full-scale Northridge earthquake, the permanent offset at each floor in the controlled structure is usually a small part of the uncontrolled structure. In other floors, the permanent drift ratio is reduced effectively. Note that the semi-active H∞ control strategy performs much better than the other two schemes. In the case of full-scale Kobe earthquake, the permanent offset of the controlled structure is generally greatly smaller than that of the uncontrolled structure throughout all floors, and the control effect of the semi-active H∞ control strategy on the permanent offset is a little better than that of the other two strategies. Additionally, the evaluation criteria J4 in Table 2 is above 1.0 for the full-scale Northridge earthquake because of the existence of the permanent offset.Fig. 6

Bottom Line: In this strategy, a modified Kalman-Bucy observer which is suitable for the proposed semi-active strategy is developed to obtain the state vector from the measured semi-active control force and acceleration feedback, taking into account of the effects of nonlinearity, disturbance and uncertainty of controlled system parameters by the observed nonlinear accelerations.It is indicated that the proposed semi-active H∞ control strategy provides much better control performances by comparison with the semi-active MPC and Clipped-LQG control approaches, and can reduce nonlinear seismic response and minimize the damage in the buildings.Besides, it enhances the reliability of the control performance when compared with the active control strategy.

View Article: PubMed Central - PubMed

Affiliation: Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Department of Civil Engineering, Fujian University of Technology, Fuzhou, 350118 China.

ABSTRACT
Different from previous researches which mostly focused on linear response control of seismically excited high-rise buildings, this study aims to control nonlinear seismic response of high-rise buildings. To this end, a semi-active control strategy, in which H∞ control algorithm is used and magneto-rheological dampers are employed for an actuator, is presented to suppress the nonlinear vibration. In this strategy, a modified Kalman-Bucy observer which is suitable for the proposed semi-active strategy is developed to obtain the state vector from the measured semi-active control force and acceleration feedback, taking into account of the effects of nonlinearity, disturbance and uncertainty of controlled system parameters by the observed nonlinear accelerations. Then, the proposed semi-active H∞ control strategy is applied to the ASCE 20-story benchmark building when subjected to earthquake excitation and compared with the other control approaches by some control criteria. It is indicated that the proposed semi-active H∞ control strategy provides much better control performances by comparison with the semi-active MPC and Clipped-LQG control approaches, and can reduce nonlinear seismic response and minimize the damage in the buildings. Besides, it enhances the reliability of the control performance when compared with the active control strategy. Thus, the proposed semi-active H∞ control strategy is suitable for suppressing the nonlinear vibration of high-rise buildings.

No MeSH data available.


Related in: MedlinePlus