Seismic Response of Torsionally Coupled System with Magnetorheological Dampers

Mevada, Snehal V.; Jangid, R. S.

doi:10.1155/2012/381834

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…In the squeeze mode, the MR fluid is made to flow between two plates that are perpendicular to each other and in mobile state. This is applied in impact dampers and low amplitude vibration but more dynamic forces [11][12][13][14][15].…”

Section: Modes Of Mr Fluidmentioning

confidence: 99%

A Review on the Magnetorheological Fluid, Damper and Its Applications for Seismic Mitigation

et al. 2018

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Magnetorheological (MR) fluids and dampers have wide advances as smart materials because of its unique properties, notably, viscosity increases in the presence when magnetic field applied MR Fluids composed of three key components, including carrier fluid, surfactants and metal particles. The major applications of MR Fluids are in brakes, dampers, journal bearings, fluid clutches, pneumatic artificial muscles, aerospace etc. where electrical energy is converted to mechanical energy (Damping Force) in a controlled manner. Within a few milliseconds the fluid converts from liquid to semi solid state. Over the years, researchers were concerned on the ways to enhance the modelling precision. Though the proposed Dynamic models of MR Dampers represent displacement and force behaviour. In this review paper, the advances of MR Fluids, MR Damper, Damper Models, Energy harvesting and their applications for seismic resistance of structures are briefly discussed in the present study.

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Section: Modes Of Mr Fluidmentioning

confidence: 99%

A Review on the Magnetorheological Fluid, Damper and Its Applications for Seismic Mitigation

et al. 2018

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“…Shook et al (2009) investigated the performance of MR dampers’ semi-active control system using a fuzzy logic controller to control the torsional response of a three-storey structure with asymmetric distribution of mass in the plan. Mevada and Jangid (2012a) investigated the performance of MR dampers’ semi-active control system via the clipped-optimal control algorithm with H 2 /LQG control strategy in controlling single-storey structure with asymmetric distribution of stiffness. Bharti et al (2014) evaluated the MR dampers’ performance in controlling the torsional response of a one-storey structure with asymmetric distribution of stiffness and investigated the influence of the building parameters and also applied voltage to the dampers on the performance of the control system.…”

Section: Introductionmentioning

confidence: 99%

Reliability assessment and seismic control of irregular structures by magnetorheological fluid dampers

Bagherkhani

Baghlani

2020

Journal of Intelligent Material Systems and Structures

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The catastrophic damages of past earthquakes show that irregular structures are more vulnerable to seismic excitation. On the other hand, dynamic responses depend on the severity of irregularity which is hard to be determined precisely. In this study, performance and reliability of magnetorheological (MR) fluid dampers in controlling torsional-lateral responses of irregular structures are evaluated. In this regard, plan-asymmetry is studied by considering mass eccentricity; whereas vertical-irregularity is investigated by creating mass difference in adjacent stories of the structure. The performance of MR dampers in seismic control of the structure is then evaluated for passive and semi-active control scenarios. The reliability of the structure-MR damper system is then studied by considering uncertainties in severity of irregularities using the Monte Carlo simulation method. Six types of limit state function are defined and the reliability of the system for controlling the desired responses are derived. The results show satisfactory performance of MR dampers in controlling coupled torsional-lateral responses of the structure in which semi-active control system outperforms the passive control system. The results also confirm that the performance of the control system highly depends on the structure irregularity which should be taken into account for design of a safe and reliable structure.

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“…It was observed that for torsionally flexible and strongly coupled systems, the effects of torsional coupling are more pronounced as compared to torsionally stiff systems. Mevada and Jangid (2012c) studied the effects of torsional coupling for asymmetric building installed with semi-active MR dampers and found that the effects of torsional coupling on effectiveness of semi-active MR damper system are more sensitive to the variation of eccentricity and torsional to lateral frequency ratio. Although, above studies reflect the effectiveness of passive and some of the semiactive systems in controlling the lateral-torsional responses, however, no specific study has been done to investigate the effectiveness of semi-active stiffness dampers for asymmetric buildings.…”

Section: Introductionmentioning

confidence: 99%

Seismic response of torsionally coupled building with passive and semi-active stiffness dampers

Mevada¹,

Jangid

2015

Int J Adv Struct Eng

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The seismic response of single-storey, oneway asymmetric building with passive and semi-active variable stiffness dampers is investigated. The governing equations of motion are derived based on the mathematical model of asymmetric building. The seismic response of the system is obtained by numerically solving the equations of motion using state-space method under different system parameters. The switching and resetting control laws are considered for the semi-active devices. The important parameters considered are eccentricity ratio of superstructure, uncoupled lateral time period and ratio of uncoupled torsional to lateral frequency. The effects of these parameters are investigated on peak lateral, torsional and edge displacements and accelerations as well as on damper control forces. The comparative performance is investigated for asymmetric building installed with passive stiffness and semi-active stiffness dampers. It is shown that the semi-active stiffness dampers reduce the earthquake-induced displacements and accelerations significantly as compared to passive stiffness dampers. Also, the effects of torsional coupling on effectiveness of passive dampers in reducing displacements and accelerations are found to be more significant to the variation of eccentricity as compared to semi-active stiffness dampers.

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Seismic Response of Torsionally Coupled System with Magnetorheological Dampers

Cited by 9 publications

References 20 publications

A Review on the Magnetorheological Fluid, Damper and Its Applications for Seismic Mitigation

A Review on the Magnetorheological Fluid, Damper and Its Applications for Seismic Mitigation

Reliability assessment and seismic control of irregular structures by magnetorheological fluid dampers

Seismic response of torsionally coupled building with passive and semi-active stiffness dampers

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