Time‐Delay Compensation in Active Damping of Stuctures

Abdel‐Mooty, Mohamed; Roorda, J.

doi:10.1061/(asce)0733-9399(1991)117:11(2549)

Cited by 35 publications

(5 citation statements)

References 16 publications

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“…The modi"ed gain matrix G M in Equation (28) is derived using the recursive response equation in Equation (27) and it does not guarantee the stability of the closed-loop system. In this paper, the stability and performance of the recursive response method will be investigated through a numerical example of a three-storey building.…”

Section: Recursive Response Compensation Methodsmentioning

confidence: 99%

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Compensation of time-delay for control of civil engineering structures

Agrawal

Yang

2000

Earthquake Engng. Struct. Dyn.

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SUMMARYTime-delay is an important issue in structural control. Applications of unsynchronized control forces due to time-delay may result in a degradation of the control performance and it may even render the controlled structures to be unstable. In this paper, a state-of-the-art review for available methods of time-delay compensation is presented. Then, "ve methods for the compensation of "xed time-delay are presented and investigated for active control of civil engineering structures. These include the recursive response method, state-augmented compensation method, controllability based stabilization method, the Smith predictor method and the Pade approximation method, all are applicable to any control algorithm to be used for controlled design. Numerical simulations have been conducted for MDOF building models equipped with an active control system to demonstrate the stability and control performance of these time-delay compensation methods. Finally, the stability and performance of the phase shift method, that is well-known in civil engineering applications, have also been critically evaluated through numerical simulations.

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Section: Recursive Response Compensation Methodsmentioning

confidence: 99%

“…Abdel-Mooty and Roorda [27] studied the control of a simply supported beam experimentally. It was shown that a serious instability problem existed because of time lag in the control system.…”

Section: U(t)"gn X(t! )#Gnmentioning

confidence: 99%

Compensation of time-delay for control of civil engineering structures

Agrawal

Yang

2000

Earthquake Engng. Struct. Dyn.

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“…Therefore, some researchers have converted to study time-delay mechanism of dynamic systems or structures attempting to propose most effective and robust control algorithm. Primitively, the technique of time delay compensation is to investigate for reducing the effect of time delay (Abdel-Rohman, 1987;Chung et al, 1988;Abdelmooty and Roorda, 1991). It is just suitable for systems with small time delay, but not applicable to large time-delay systems.…”

Section: Introductionmentioning

confidence: 99%

Semi-active Control Strategy using Genetic Algorithm for Seismically Excited Structure Combined with MR Damper

Xue

Sun

Zhang

et al. 2011

Journal of Intelligent Material Systems and Structures

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Magnetorheological (MR) damper is a prominent semi-active control device for earthquake response mitigation of structures. The most important topic for the intelligent MR structures is choosing the control current of MR damper quickly and accurately. The typical control strategy is onoff control strategy, while inherent time-delay and coarse control precision lie in this strategy. This article proposes a semi-active control strategy for restricting the MR structures efficiently, in which the genetic algorithm (GA) is adopted to search for the optimal feedback control gain in time-delayed dynamic equations forming a GA controller, and next optimize the control current of the MR damper accurately by a series of GA procedure. The GA strategy has the capability to effectively control the MR structure involving time delay and adjusting for controlled current of the MR damper timely and accurately. Accordingly, numerical examples are used to testify that the feedback gain optimized by GA has the capability to reduce a given objective response dramatically. In addition, a comparison between GA controller and LQR controller indicates that the proposed approach performs much better than LQR method, especially in time-delay systems. Finally, simulation results for a seismically excited structure subjected by the MR damper are presented to verify that the semi-active strategy using GA is predominant in mitigating the dynamic structure efficiently. The strategy and the results presented will also throw light on the development and control of other novel structures.

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“…9 In order to decrease or eliminate the negative effect of time delay in controlled systems, time-delayed compensation method is primitively proposed to deal with small delays. 10,11 Abdel has used the method to ensure galloping suppression of controlled suspension bridge. 12 Shao applied the method to suppress the first two mode vibrations of a cantilever-like structure.…”

Section: Introductionmentioning

confidence: 99%

Active Vibration Control of Cantilever Beam with Macro-Fibre Composite Actuator Using Time-Delayed Genetic Algorithm Controller

Xiaomin¹,

Wu²,

Sun³

2017

IJAV

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As a type of intelligent active devices, macro-fibre composite (MFC) actuator serves as an ideal candidate for diverse applications in structural vibration suppression owing to its high performance, durability, and flexibility in a cost-competitive device. However, its development is usually plagued by MFC's complicated hysteretic property that creates difficulties for deducing the relationship between applied voltage and control force. Additionally, its application is also conditioned by time delay, which not only degrades the performance but also induces instability of the control system. In view of this, an active control method is proposed here for mitigating distributed parameter systems actuated by MFC patch. First, an electric-mechanical characteristic experiment of the MFC is carried out to obtain its mathematic relation between applied voltage and relative strain, which can lay a basic foundation for the control algorithm design of MFC systems. Next, based on uncoupled motion equation of a distributed system, an optimized time-delayed control law is proposed by using a genetic algorithm (GA) procedure. Finally, numerical examples and corresponding experimental cases are utilized to verify the proposed approaches capable of providing satisfactory control effect with different time delays. The present study can cast light on the development of other novel smart devices and their controlled systems.

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Time‐Delay Compensation in Active Damping of Stuctures

Cited by 35 publications

References 16 publications

Compensation of time-delay for control of civil engineering structures

Compensation of time-delay for control of civil engineering structures

Semi-active Control Strategy using Genetic Algorithm for Seismically Excited Structure Combined with MR Damper

Active Vibration Control of Cantilever Beam with Macro-Fibre Composite Actuator Using Time-Delayed Genetic Algorithm Controller

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