μ-Synthesis Controller Design for Seismic Alleviation of Structures with Parametric Uncertainties

Gudarzi, Mohammad

doi:10.1260/0263-0923.34.4.491

Cited by 12 publications

(6 citation statements)

References 46 publications

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“…28 The robustness of the control strategies is studied by many different applications considering the sensitivity of the control system to parametric errors and measurement noise added to the system. 11,26–32 Many dynamic destructive effects, such as high-frequency dynamics, which cannot be modeled and which form in different parts of the system, can be evaluated in a single block, such as “Δ.” These uncertainties are called “nonstructural uncertainties.” In linear time-invariant systems, Δ represents an unknown transfer function. Differences between real systems and dynamic models are modeled as follows …”

Section: Robust Control Designmentioning

confidence: 99%

Experimental investigation of semiactive robust control for structures with magnetorheological dampers

AGGÜMÜŞ

Çetin

2018

Journal of Low Frequency Noise, Vibration and Active Control

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This study investigates reducing the vibration of structures under different earthquakes using magnetorheological dampers. To investigate the effect of the magnetorheological damper arrangement on reducing the vibration amplitude of structures, experimental studies are conducted in which magnetorheological dampers are commanded by a robust controller. So, the performance of the system is investigated using different combinations of two magnetorheological dampers on a building and three different arrangements for dampers are considered for experimental study. Additionally, an H 1 controller is designed to determine the voltage transmitted to the magnetorheological dampers. The results show that the magnetorheological damper commanded with the robust controller effectively reduces the vibration of a sixstory steel structure. Furthermore, the magnetorheological damper arrangement in which the one end is connected to the ground reduces the vibration amplitudes.

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Section: Robust Control Designmentioning

confidence: 99%

Experimental investigation of semiactive robust control for structures with magnetorheological dampers

AGGÜMÜŞ

Çetin

2018

Journal of Low Frequency Noise, Vibration and Active Control

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“…using LQR, Lyapunov, MPC, fuzzy, or neural networks based methods. 19–22,24,25,27–29,37 This work adopts the sky-hook damper principle (also known as the absolute velocity feedback) to compute Fd. By measuring the base-isolated absolute acceleration, an integral control law computes the desired force that assures a –40 dB/decade high-frequency response attenuation rate with no overshoot for base-isolated structures described by 38 …”

Section: Semi-active Vibration Controlmentioning

confidence: 99%

Semi-active structural vibration control of base-isolated buildings using magnetorheological dampers

Oliveira

Botto

Morais

et al. 2017

Journal of Low Frequency Noise, Vibration and Active Control

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In recent years, several solutions for structural vibration control of buildings have been proposed. In particular, the combination of base-isolated structures with complementary variable damping devices has been successful in reducing the base isolator displacements without increasing the building superstructure response when subjected to earthquake loads. In this paper, a magnetorheological device is installed on a 2-DOF mechanical model mounted on an experimental uniaxial shaking table. A simple numerical simulation model is derived for the experimental setup and it represents a typical base-isolated structure with a semi-active vibration controller. The control law combines a force tracking integral action with a clipped on–off adaptation rule that changes the magnetorheological damping in real time. The effectiveness of the proposed solution is demonstrated for both earthquake-like and real earthquake input ground motions. A comparison between the numerical and the experimental results validates the numerical simulations and it gives confidence in using this model for validation and evaluation of other semi-active control solutions based on magnetorheological dampers.

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“…(6), as shown in Fig. 6, can be solved iteratively by means of D-K iteration approach [40,41]. and look for an appropriate frequency dependent function D(s) in a certain range of frequency to satisfy the previous constraints on () Ds .…”

Section: µ-Synthesismentioning

confidence: 99%

Mu-Synthesis Based Active Robust Vibration Control of an Mri Inlet

Oveisi

Nestorović

2016

FU Mech Eng

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In this paper, a robust control technique based on μ-synthesis is employed in order to investigate the vibration control of a funnel-shaped structure that is used as the inlet of a magnetic resonance imaging (MRI) device. MRI devices are widely subjected to the vibration of the magnetic gradient coil which then propagates to acoustic noise and leads to a series of clinical and mechanical problems. In order to address this issue and as a part of noise cancellation study in MRI devices, distributed piezo-transducers are bounded on the top surface of the funnel as functional sensor/actuator modules. Then, a reduced order linear time-invariant (LTI) model of the piezolaminated structure in the state-space representation is estimated by means of a predictive error minimization (PEM) algorithm as a subspace identification method based on the trust-region-reflective technique. The reduced order model is expanded by the introduction of appropriate frequency-dependent weighting functions that address the unmodeled dynamics and the augmented multiplicative modeling uncertainties of the system. Then, the standard D-K iteration algorithm as an output-feedback control method is used based on the nominal model with the subordinate uncertainty elements from the previous step. Finally, the proposed control system implemented experimentally on the real structure is to evaluate the robust vibration attenuation performance of the closed-loop system.

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μ-Synthesis Controller Design for Seismic Alleviation of Structures with Parametric Uncertainties

Cited by 12 publications

References 46 publications

Experimental investigation of semiactive robust control for structures with magnetorheological dampers

Experimental investigation of semiactive robust control for structures with magnetorheological dampers

Semi-active structural vibration control of base-isolated buildings using magnetorheological dampers

Mu-Synthesis Based Active Robust Vibration Control of an Mri Inlet

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