Absolute-energy-based active control strategies for linear seismic isolation systems

Lu, Lyan Ywan; Lin, Guan-Bo; Lin, Chun-Liang

doi:10.1002/stc.373

Cited by 8 publications

(7 citation statements)

References 35 publications

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“…4. To improve the performance of active isolation systems (AISs) for acceleration sensitive equipment or structures, two optimal control laws that utilize performance indices associated with system absolute energy were proposed in [10]. The first control law, which requires the measurement of the ground velocity in deciding the control force, is derived based on the concept of instantaneous optimal control.…”

Section: New Active Control Approaches Presented During the Last mentioning

confidence: 99%

See 1 more Smart Citation

A Short Review on the Active Control Approaches in Earthquake Engineering at the Last 10 Years (2008-2018)

Yanik¹,

Aldemir²

2019

IJET

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This paper is written to present the state of the art of the new active and semi active approaches during the last decade. This is achieved by reviewing the active control approaches and semi-active control policies that have been proposed and validated analytically or numerically in the last ten years. All the papers reviewed in this study are within the scope of earthquake engineering. Brief information about these active control approaches and some of the resulting control policies are presented. To be able to show the effectiveness of the proposed approaches, the numerical examples of these papers are presented in this study. Because of the latest technological and computational advances, some of the most effective and complex algorithms have been studied and numerically validated during the last decade in earthquake engineering. This is the reason that this review considers the period of 2008-2018. The authors also include some of the new semi-active control policies that have been proposed numerically during the last decade. It has been concluded that, although there is an impressive research on numerically and/or analytically validating new active control approaches and new semi-active control policies of the years 2008-2018, there is not any real-building / real structure implementation of these active control approaches. Additionally there is a need of experimental validation of these active control methods that have been presented during the last decade.

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Section: New Active Control Approaches Presented During the Last mentioning

confidence: 99%

“…The second one is based on the concept of discrete-time optimal control, in which the feedback gain can be obtained by solving the discrete-time algebraic Riccati equation. The simple mathematical model of the active isolation system studied in [10] shown in Fig. 5.…”

Section: New Active Control Approaches Presented During the Last mentioning

confidence: 99%

A Short Review on the Active Control Approaches in Earthquake Engineering at the Last 10 Years (2008-2018)

Yanik¹,

Aldemir²

2019

IJET

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“…The adaptability of variable isolation systems is usually achieved with three different approaches: active, semi-active and passive. In the first two, an active [5] or semi-active device [6] is incorporated into a conventional isolation system, and such devices act as a supplementary part of the isolation system that provides an efficient adaptive force, so the isolation performance of the whole system can be greatly improved. Nevertheless, both active and semi-active systems require sensing, actuation and computational units, so they may be more complicated and require more maintenance work than a passive one.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Pendulum Isolator System under Vertical and Horizontal Earthquake Excitation

Jamalzadeh¹,

Barghian

2015

Period. Polytech. Civil Eng.

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The paper studies a pendulum isolator. This isolator has a spherical surface which is placed on the foundation and it has an arm which is connected to the column of the building as a hinge. When the height of the arm is less than the curvature radius of the spherical surface, and a small movement is applied on it, a restoring force will be applied to the isolator. In this paper the effect of horizontal and vertical component of seismic load was studied. The dynamic equation of motion was obtained for the pendulum isolator under horizontal and vertical accelerations of seismic loads. The equation was solved by step time integration method. The comparison of the results of horizontal component effect and the combined effect of horizontal and vertical components on the isolator showed that the vertical component effect increased the isolator horizontal displacement response and increased the isolator horizontal acceleration.Keywords base isolation · vibration control · pendulum isolator · earthquake vertical acceleration effect · combined horizontal and vertical components effects of earthquake

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“…Maximum control energy dissipation is used to defi ne the most effective optimal linear control law in [18]. Some energy-based active control algorithms are proposed in [19]. In order to simultaneously consider the mechanical energy of the structure, control and the seismic energies in the minimization procedure, a new performance index was proposed in [20].…”

Section: Introductionmentioning

confidence: 99%

Energy distributions in actively and passively controlled nonlinear structures

Yanik¹,

Aldemir²,

Bakioglu³

2014

Int. J. CMEM

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In this study, the energy distributions of actively or passively controlled multistory nonlinear shear structures are investigated. Nonlinear differential equations of motion of the structure and the energy equations are derived for an uncontrolled and a controlled structure. A computer program which takes into account the nonlinearity of the material is developed and used for the dynamic analysis of the controlled and the uncontrolled structure. As numerical examples, two different structures are examined with six different control cases. These structures are a three-story and a twelve-story shear structure. In the dynamic analysis, the Erzincan and El Centro earthquakes are used. Active and passive controls are obtained by implementing base isolation and a mass damper into the structure. In addition, a hybrid structural control case is examined by implementing base isolation with an active mass damper to the structure. In total, six different passive and active control cases are investigated. An instantaneous optimal control algorithm, which minimizes the performance index defi ned as a time-dependent quadratic scalar functional instead of a quadratic integral functional and takes into account only the current state, is used as an active control algorithm. The results are given as force-displacement, acceleration, and energies in a comparative way for uncontrolled and controlled structures. The results show that the responses of the structure are reduced and the structural behavior is improved by using structural control.

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Absolute-energy-based active control strategies for linear seismic isolation systems

Cited by 8 publications

References 35 publications

A Short Review on the Active Control Approaches in Earthquake Engineering at the Last 10 Years (2008-2018)

A Short Review on the Active Control Approaches in Earthquake Engineering at the Last 10 Years (2008-2018)

Dynamic Response of a Pendulum Isolator System under Vertical and Horizontal Earthquake Excitation

Energy distributions in actively and passively controlled nonlinear structures

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