Active control of MDOF structures with supplemental electrorheological fluid dampers

Ribakov, Yuri; Gluck, J.

doi:10.1002/(sici)1096-9845(199902)28:2<143::aid-eqe808>3.0.co;2-i

Cited by 23 publications

(14 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the response state vector, z(t), Equations (12), (14) and (15) Considering closed-loop instantaneous control [2],…”

Section: Control Lawmentioning

confidence: 99%

“…Gavin et al [12] and Makris et al [13] developed electrorheological (ER) fluid dampers, and suggested their use as semi-active systems. Ribakov et al [14] showed that semi-active control systems including ER dampers designed according to the instantaneous optimal control significantly improve the behavior of building structures during earthquake motions. However, the resulting damping forces in ER dampers depend on the velocity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Predictive controlled stiffness devices in MDOF structures

Ribakov

2003

J. Struct. Control

Self Cite

View full text Add to dashboard Cite

This paper presents a study of a predictive control system used to improve the behavior of a multistorey structure under strong earthquakes. The structure and application of supplemental controlled stiffness devices (CSD) are discussed. Instantaneous optimal control is used to obtain the control forces at each time step during an earthquake according to the predicted values of the displacements and the velocities of each storey. A linear autoregressive model with exogenous input (ARX) is used to predict the displacements and the velocities of the frame in order to overcome the time delay problem in the control system. Control of the forces developed in the CSD is possible, owing to the mechanical structure of the device. This device can be efficiently used as a controller because the forces developed in it are independent of the structure's displacements or velocities. Its efficiency is demonstrated in a numerical simulation of a seven-storey building. The simulation shows that the behavior of a structure with the proposed predictive control system is significantly improved compared with that of an uncontrolled structure subjected to the same earthquakes. In this example, the displacements and velocities in the structure were predicted according to an 'occurring' earthquake by the ARX model and were used to obtain the optimal control forces (predictive control). These forces yielded a response of the structure with CSD that was similar to the response obtained with control forces, which were calculated from a 'known' complete history of the earthquake displacement and velocity values (instantaneous optimal control).

show abstract

“…For the response state vector, z(t), Equations (12), (14) and (15) Considering closed-loop instantaneous control [2],…”

Section: Control Lawmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predictive controlled stiffness devices in MDOF structures

Ribakov

2003

J. Struct. Control

Self Cite

View full text Add to dashboard Cite

show abstract

“…stiffness and damping) of the control device with almost no external power. Magnetorheological (MR) and electrorheological (ER) dampers [11,[35][36][37][38][39][40][41][42][43] and variable stiffness devices [44,45] are examples of semiactive dampers. Buildings incorporating semiactive devices exhibit nonlinear behavior and, except for relatively few special cases, the mathematical theory of nonlinear vibrations provides little help for practical nonlinear vibration control problems [13].…”

Section: Introductionmentioning

confidence: 99%

Predictive suboptimal semiactive control of earthquake response

Aldemir

2009

Struct. Control Health Monit.

View full text Add to dashboard Cite

The truly optimal semiactive control establishes the best possible performance of a dynamically excited and a semiactively controlled isolated structure, subjected to the investigated damper constraints. While it is acausal, and cannot be implemented in practice, it provides a performance goal for implementable control schemes. This paper proposes an implementable predictive control to suppress the earthquake response using a nonlinear semiactive damper. The proposed method uses the Kalman Filtering Technique for the prediction of the near-future ground accelerations. The performance of a 2-degree-of-freedom base-isolated structure is investigated for the proposed predictive control and compared with those of the passive damping, passive on-off cases, two causal semiactive controls, the truly optimal control and the uncontrolled case. The results obtained illustrate that the proposed predictive control shows a good agreement with the ideal best passive case and the causal continuous semiactive control while it follows the truly optimal trajectories closely, except for the peak responses. The proposed control is effective in reducing the base drift without increasing the superstructure response.

show abstract

“…Yang et al (1996) demonstrated that active variable stiffness systems are effective in reducing the interstory drifts; however, they may yield significantly increased floor accelerations. Ribakov and Gluck (1999) showed that semi-active control systems including electro-rheological (ER) dampers designed according to the instantaneous optimal control significantly improve the behavior of building structures during earthquake motions. However, the resulting damping forces in the ER dampers depend on the velocity.…”

Section: Introductionmentioning

confidence: 99%

Optimal control of MDOF structures with controlled stiffness dampers

Ribakov

Dancygier

2003

Structural Design Tall Build

Self Cite

View full text Add to dashboard Cite

The structure and application of supplemental controlled stiffness dampers are discussed. The instantaneous and the polynomial active control theories are used to obtain the control forces at each time step during an occurring earthquake. The efficiency of these control strategies in a structure with the controlled stiffness dampers is compared. Control of the damping forces is enabled due to the mechanical structure of the damper, which is described in the paper. This device can be efficiently used as a structural damper because the forces developed in it are independent of the structure's displacements or velocities. The efficiency of the damper is demonstrated in a numerical simulation of a seven-story building. The simulation shows that the behavior of a structure with the active controlled stiffness dampers was significantly improved compared to that of an uncontrolled structure, and of a passive controlled viscous damped structure, subjected to the same earthquakes.

show abstract

Active control of MDOF structures with supplemental electrorheological fluid dampers

Cited by 23 publications

References 2 publications

Predictive controlled stiffness devices in MDOF structures

Predictive controlled stiffness devices in MDOF structures

Predictive suboptimal semiactive control of earthquake response

Optimal control of MDOF structures with controlled stiffness dampers

Contact Info

Product

Resources

About