Phenomenological Model for Magnetorheological Dampers

Spencer, B. F.; Dyke, Shirley J.; Sain, M.K.; Carlson, J. D.

doi:10.1061/(asce)0733-9399(1997)123:3(230)

Cited by 1,869 publications

(1,642 citation statements)

References 27 publications

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“…In this model, a Coulomb friction element is placed in parallel with a linear viscous damper. The force-displacement behavior appears to be reasonably modeled; however, this model does not exhibit the observed nonlinear force-velocity response, especially when the displacement and velocity have the same sign and the magnitude of the velocity is small [14]. A more accurate dynamic model of MR dampers is necessary for analysis and synthesis of structures employing MR dampers.…”

Section: Dynamic Modeling Of Mr Dampersmentioning

confidence: 99%

“…However, these models can not readily capture the force roll-off in the low velocity region that is observed in the experimental data. Spencer et al [14] proposed a mechanical model for MR dampers based on the Bouc-Wen hysteresis model that overcomes a number of difficulties mentioned previously. The schematic of the model is shown in Fig.…”

Section: Dynamic Modeling Of Mr Dampersmentioning

confidence: 99%

“…(13) (16) which yields (17) By using Eqs. (10)(11)(12), (14), (15) and (17), the pressure gradient of the flow , and can be solved numerically [16].…”

Section: Axisymmetric Modelmentioning

confidence: 99%

See 2 more Smart Citations

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

Yang

Spencer

Carlson

et al. 2002

Engineering Structures

658

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: Dynamic Modeling Of Mr Dampersmentioning

confidence: 99%

Section: Dynamic Modeling Of Mr 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

658

508

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show abstract

“…In order to illustrate the application of semiactive control system using MR dampers [33,34], a clipped optimal control strategy [28] based on H 2 /LQG method is presented. The clipped optimal control approach involves the design of a controller for an active system with the desired optimal control force being generated by an MR damper according to the voltage control law,…”

Section: Semiactive Control: Linear Elastomeric Isolation Systemmentioning

confidence: 99%

Smart base-isolated benchmark building. Part I: problem definition

Narasimhan

Nagarajaiah

Johnson

et al. 2006

Struct. Control Health Monit.

205

181

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SUMMARYSample controllers for a three-dimensional smart base-isolated building benchmark problem with linear and frictional isolation system are presented in this paper. A Kalman filter is used to estimate the states based on absolute acceleration measurements. Input filters are used to better inform the controller of the spectral content of the earthquake excitations. A reduced order control-oriented model of the benchmark structure with a linear isolation system is developed. A H 2 /linear quadratic Gaussian controller is presented for the active case; additionally, a clipped optimal controller is presented for the semiactive case. A preliminary 'skyhook' semiactive controller is also presented for the benchmark problem. Magnetorheological fluid dampers are used for control in the semiactive case and ideal actuators are used for control in the active case. The focus of this phase I study is on the linear isolation system only. Computed results for the passive, semiactive, and active cases are presented. Detailed comparisons of benchmark performance indices for base-isolated structures with a nominal linear isolation system, with and without control, for a set of strong near-field earthquakes are presented. The modeling and sample control designs demonstrated in this paper can be used to form the basis for studying a wide variety of active and semiactive control strategies}to be developed by the participants in the benchmark study}for linear base-isolated buildings.

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“…Magneto-rheological (MR) semi-active dampers with multiple ratio characteristics are able to be controlled efficiently by applied magnetic field vibrations of various dynamical systems [1,2,3,4]. Having relatively small switching time (between different damping ratio) they have replaced traditional electrohydraulic dampers [5].…”

Section: Introductionmentioning

confidence: 99%

Response of a magneto‐rheological fluid damper subjected to periodic forcing in a high frequency limit

Litak¹,

Borowiec²,

Kasperek³

2008

Z Angew Math Mech

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We explored vibrations of a single-degree of freedom oscillator with a magnetorheological damper subjected to kinematic excitations. Using fast and slow scales decoupling procedure we derived an effective damping coefficient in the limit of high frequency excitation. Damping characteristics, as functions of velocity, change considerably especially by terminating the singular non-smoothness points. This effect was more transparent for a larger control parameter which was defined as the product of the excitation amplitude and its frequency.

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Phenomenological Model for Magnetorheological Dampers

Cited by 1,869 publications

References 27 publications

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

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

Smart base-isolated benchmark building. Part I: problem definition

Response of a magneto‐rheological fluid damper subjected to periodic forcing in a high frequency limit

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