Analysis and Design of ER Damper for Seismic Protection of Structures

Makris, Nicos; Burton, Scott A.; Hill, Davide A.; Jordan, Mabel

doi:10.1061/(asce)0733-9399(1996)122:10(1003)

Cited by 93 publications

(59 citation statements)

References 10 publications

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“…Phillips [43] developed a set of nondimensional variables and a corresponding quintic equation to determine the pressure gradient of the flow through a parallel duct. This approach was utilized by Gavin et al [4] and Makris et al [6] in their studies. Wereley and Li [51] developed a similar parallel-plate model utilizing a different set of nondimensional variables.…”

Section: Quasi-static Analysis Of Mr Fluid Dampersmentioning

confidence: 99%

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Large-scale MR fluid dampers: modeling and dynamic performance considerations

Yang

Spencer

Carlson

et al. 2002

Engineering Structures

656

508

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The magnetorheological (MR) damper is one of the most promising new devices for structural vibration reduction. Because of its mechanical simplicity, high dynamic range, low power requirements, large force capacity and robustness, this device has been shown to mesh well with application demands and constraints to offer an attractive means of protecting civil infrastructure systems against severe earthquake and wind loading. In this paper, an overview of the essential features and advantages of MR materials and devices is given. This is followed by the derivation of a quasi-static axisymmetric model of MR dampers, which is then compared with both a simple parallel-plate model and experimental results. While useful for device design, it is found that these models are not sufficient to describe the dynamic behavior of MR dampers. Dynamic response time is an important characteristic for determining the performance of MR dampers in practical civil engineering applications. This paper also discusses issues affecting the dynamic performance of MR dampers, and a mechanical model based on the Bouc-Wen hysteresis model is developed. Approaches and algorithms to optimize the dynamic response are investigated, and experimental verification is provided.

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Section: Quasi-static Analysis Of Mr Fluid Dampersmentioning

confidence: 99%

“…The yield stress is assumed to be a monotonic function of radius , therefore, one plug flow region exists when the fluid flows. In region I, the shear stress is given by (6) This is substitute into Eq. (5) and integrated once with respect to .…”

Section: Axisymmetric Modelmentioning

confidence: 99%

Large-scale MR fluid dampers: modeling and dynamic performance considerations

Yang

Spencer

Carlson

et al. 2002

Engineering Structures

656

508

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“…The essential characteristic of controllable fluids is their ability to switch from a free-flowing linear viscous fluid to a semi-solid with controllable yield strength in milliseconds when exposed to an electric or magnetic field, for electrorheological (ER) and magnetorheological (MR) fluids, respectively. Although research initially concentrated primarily on ER dampers 32 , certain features related to the limited range of achievable yield stress, the sensitivity to contaminants and extreme temperatures, and the increased voltage demand 1 , prevented their implementation to large-scale civil structures. On the contrary, MR dampers 33 ( Figure 4) have attracted considerable research in recent years, while nowadays they can be easily acquired on the market.…”

Section: Controllable Fluid Dampersmentioning

confidence: 99%

Semi-Active Control Systems in Bridge Engineering: A Review of the Current State of Practice

Gkatzogias

Kappos

2016

Structural Engineering International

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This is the accepted version of the paper.This version of the publication may differ from the final published version. In view of the grave socioeconomic consequences of earthquake damage to bridge structures, along with their critical role in modern and older road and rail networks, this article attempts to identify and summarise the current trends in the use of semi-active control technology in bridge engineering, as an enhanced seismic response control solution, combining increased adaptability and reliability, compared to passive and active schemes. In this context, representative analytical and experimental studies, as well as some full-scale applications of semi-active control devices are first reviewed and a brief description of relevant benchmark studies is subsequently presented, with a view to serving as a point of reference for further research and development. A framework of performance-based control principles aiming at the aforementioned objectives is finally set forth. Permanent

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“…[3][4][5] Another recent source of interest for hysteresis in mechanical and structural systems comes from the new "smart" materials and devices used for vibration control. Materials such as shape memory alloys 6 and electro/magnetorheological fluids 7,8 have been proposed for this purpose, which exhibit complicated hysteretic behaviors.…”

mentioning

confidence: 99%

Adaptive backstepping control of a class of hysteretic systems

2003

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A backstepping-based adaptive control is designed for a class of one degree of freedom hysteretic system. The true hysteretic behavior does not need to be known for the controller design. A polynomial description is assumed with uncertain coefficients and an uncertain residual function. These uncertainties are bounded and lump the discrepancies between the adopted description and the real hysteretic behavior. The adaptive controller is able to handle these uncertainties and make the closed loop globally uniformly ultimately bounded when the system is subject to an unknown excitation from which a bound is known. The efficiency of the approach is tested by numerical simulations on a hysteretic system under a seismic excitation. This system is mathematically described by the differential Bouc-Wen model, which is widely used in structural dynamics.

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Analysis and Design of ER Damper for Seismic Protection of Structures

Cited by 93 publications

References 10 publications

Large-scale MR fluid dampers: modeling and dynamic performance considerations

Large-scale MR fluid dampers: modeling and dynamic performance considerations

Semi-Active Control Systems in Bridge Engineering: A Review of the Current State of Practice

Adaptive backstepping control of a class of hysteretic systems

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