Optimal Control of Earthquake Response Using Semiactive Isolation

Gavin, Henri P.; Aldemir, Ünal

doi:10.1061/(asce)0733-9399(2005)131:8(769)

Cited by 26 publications

(22 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3(a). The static test consisted in the application of three displacement cycles between -34 mm and 34 mm in steps of 8.5 mm and from the force-displacement data the following values were identified: stiffness k1=0.987 N/mm; and the offset force f0=-139.831 N. The dynamic tests in the stationary regime consisted in subjecting the device to sinusoidal displacement waves (10 cycles of 6.25, 12.5 and 25 mm amplitude with frequencies from 0.25 Hz to 2 Hz) and from the force-displacement and force-velocity data identify the Modified [1][2][3][4][5][6][7][8][9][10][11][12]; for these last parameters a set of tables relating the model parameters with the input voltage and peak velocity were implemented, and intermediate values were calculated using linear interpolation. The dynamic tests under the transient regime used a triangle displacement signal and imposed step voltage to the damper between inversions (12,5 mm of amplitude, frequencies from 0.25 Hz to 0.75 Hz, and input steps from 0 V to 5 V and 5 V to 0 V) to identify the response time of the damper.…”

Section: Sa Devicementioning

confidence: 99%

“…The idea consists in decoupling the main structure (superstructure) from the foundation in order to reduce the potential for structural damage and increase equipment safety by reducing the transmission of seismic forces and energy to the main structure [3]. Base-isolated structures with semi-active systems (hybrid systems) have been receiving much attention in recent years for improving the performance of structures against earthquake loads [4,5]. Magneto-rheological (MR) and fluid viscous dampers (FVD) are some of the typical semi-active devices used in these situations [6,7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Semi-active Control of Base-isolated Structures

Oliveira

Morais

Suleman

2015

Procedia Engineering

View full text Add to dashboard Cite

A numerical and experimental analysis of semi-active (SA) control strategies for controlling seismic-excited structures is presented. A physical model consisting of a two degree-of-freedom (2DOF) mechanical system with a magneto-rheological (MR) damper was developed to evaluate this concept at LNEC's shaking table. Linear elastic and viscous models were used to describe the mechanical behavior of the 2DOF mechanical system. A Modified Bouc-Wen model was used to describe the behavior of the MR damper. Four distinct control strategies were implemented for numerical and experimental evaluation. The associated controllers were tuned using the system model and the ground motions information. The strategies were the integral control law, two linear quadratic regulator strategies and a predictive controller, in conjunction with a clipped on-off algorithm. In both the numerical and experimental tests the results reveal that the response of the structure is effectively mitigated by all of the analyzed control methods. It is shown that SA systems can outperform the original structure as well as one using the best passive solution for most of the strategies. The integral control law exhibits the best performance when collocated control was considered. If more responses are available for control, the linear quadratic regulator technique exhibits even better performance.

show abstract

Section: Sa Devicementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Semi-active Control of Base-isolated Structures

Oliveira

Morais

Suleman

2015

Procedia Engineering

View full text Add to dashboard Cite

show abstract

“…In fact, implementable optimal control algorithms are mostly based on the given assumption on the excitations. Some researchers have proposed optimal control algorithms resulting from the solution of Euler-Lagrange equations for a given excitation [26,27]. However, those control algorithms are designed for an MR damper, an ER damper, or a controllable valve damper, not for the MTMD with semi-active friction devices studied herein.…”

Section: Non-sticking Friction (Nsf) Controllermentioning

confidence: 99%

Vibration control of seismic structures using semi-active friction multiple tuned mass dampers

Lin

et al. 2010

Engineering Structures

View full text Add to dashboard Cite

“…T 0i (14) In this study, only the case of r i = n i (thus B 0i = I n i ) is considered for simplicity. Using the sliding mode variable defined in (11) and the control law (10), the control force vector becomes…”

Section: Decentralized Robust Control Algorithmmentioning

confidence: 99%

Decentralized robust control of building structures under seismic excitations

Tang³

2007

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

SUMMARYMany of the control algorithms proposed for structures subjected to seismic excitations are based on a centralized design philosophy, such as the linear quadratic regulator (LQR) design. The information of all the states of the system is usually required in these methods to determine the control command. For applications involving large-scale systems, it may be more convenient to design decentralized controllers that depend only on the information of the local states for control command calculation. In this study, a nonlinear decentralized robust control algorithm is proposed. The structural system is decomposed into several artificially uncoupled subsystems. The interconnections between adjacent subsystems are treated as uncertain but bounded disturbances to the subsystems. The controller associated with one subsystem determines the control command based only on the states of the local subsystem. Numerical examples of linear and nonlinear structural models are presented to demonstrate the effectiveness and robustness of the proposed controller. The traditional LQR design is used as a baseline for comparison.

show abstract

Optimal Control of Earthquake Response Using Semiactive Isolation

Cited by 26 publications

References 33 publications

Semi-active Control of Base-isolated Structures

Semi-active Control of Base-isolated Structures

Vibration control of seismic structures using semi-active friction multiple tuned mass dampers

Decentralized robust control of building structures under seismic excitations

Contact Info

Product

Resources

About