CABLE VIBRATION CONTROL USING MAGNETO-RHEOLOGICAL (MR) DAMPERS

This paper proposes a new bed stage for patients in ambulance vehicle in order to improve ride quality in term of vibration control. The vibration of patient compartment in ambulance can cause a secondary damage to a patient and a difficulty for a doctor to perform emergency care. The bed stage is to solve vertical, rolling, and pitching vibration in patient compartment of ambulance. Four MR (magneto-rheological) dampers are equipped for vibration isolation of the stage. Firstly, a mathematical model of stage is derived followed by the measurement of vibration level of patient compartment of real ambulance vehicle. Then, the design parameters of bed stage is undertaken via computer simulation. Skyhook, PID and LQR controllers are used for vibration control and their control performances are compared.

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Investigation of Locking Force of Stay Cable Vibration Control Using Magneto-Rheological Fluid Damper

Aerospace ◽

10.1115/imece2006-14053 ◽

2006 ◽

Author(s):

Liu Min ◽

Vineet Sethi ◽

Gangbing Song ◽

Hui Li

Keyword(s):

Vibration Control ◽

Smart Materials ◽

Mr Damper ◽

Pole Placement ◽

Stay Cable ◽

Cable Vibration ◽

Bridge Model ◽

Mode Vibration ◽

Magneto Rheological ◽

Multi Mode

This paper analyzes the locking force of a stay cable equipped with a Magneto-rheological (MR) damper. For the single mode vibration of the stay cable, the formula of the locking force is derived and the important factors that affect the locking force are analyzed. The experimental investigations of the locking force of the stay cable vibration control are carried out on a cable-stayed bridge model equipped with an MR damper to verify of the computational locking force in the Smart Materials and Structures Laboratory at University of Houston. For the multi-mode vibration of the stay cable, the modal shapes of the stay cable vibration are estimated by utilizing a pole placement observer using the acceleration values at selected locations of the stay cable and the locking forces of the stay cable in multi-mode vibration are numerically obtained. In all experimental cases, the locking forces based on the analytical and numerical formulas approximately match the experimental results.

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Investigation of Annular Gap Size for Optimizing the Dynamic Range of MR Damper Using Comsol Multiphysics Software

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.606.187 ◽

2014 ◽

Vol 606 ◽

pp. 187-192 ◽

Cited By ~ 2

Author(s):

Sharmila Fathima ◽

Asan Gani Abdul Muthalif ◽

Md. Raisuddin Khan

Keyword(s):

Vibration Control ◽

Dynamic Range ◽

Active Vibration Control ◽

Comsol Multiphysics ◽

Gap Size ◽

Viscous Stress ◽

Mr Fluid ◽

Mr Dampers ◽

Annular Gap ◽

Magneto Rheological

Magneto-rheological (MR) fluid technology has made it possible to develop reliable, revolutionary vibration control systems for a variety of commercial, medical and military applications. MR fluid shock absorber systems are enabled by remarkably versatile MR fluid technology, which allows the system to respond instantly and controllably to varying levels of vibration or shock with simple, robust designs. This paper presents a parametric study of the MR dampers for semi-active vibration control. The influence of gap size of the damper on the viscous stress of the MR fluid is examined. It is inferred from the study that the viscous stress of the MR fluid for different parameters such as gap size influences the dynamic range of MR fluid dampers.The simulated results depict a maximum viscous stress of 1765.441 N/m2for a gap size of 1.85 mm. The developed dynamic range would allow for smaller size of the device, higher dynamic yield stress and low power consumption. The simulated results using COMSOL multiphysics for the verification of the parametric strategy have been presented. Results of this study shall enhance the design of MR dampers for different control applications.

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Field comparative tests of cable vibration control using magnetorheological (MR) dampers in single- and twin-damper setups

Advances in Steel Structures (ICASS '02) ◽

10.1016/b978-008044017-0/50099-8 ◽

2002 ◽

pp. 849-856 ◽

Cited By ~ 2

Author(s):

Y.F. Duan ◽

J.M. Ko ◽

Y.Q. Ni ◽

Z.Q. Chen

Keyword(s):

Vibration Control ◽

Comparative Tests ◽

Cable Vibration ◽

Mr Dampers

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Modeling and Evaluation of Magnetorheological Dampers with Fluid Leakage for Cable Vibration Control

Journal of Bridge Engineering ◽

10.1061/(asce)be.1943-5592.0001666 ◽

2021 ◽

Vol 26 (2) ◽

pp. 04020119

Author(s):

Peng Zhou ◽

Min Liu ◽

Weiming Kong ◽

Yingmei Xu ◽

Hui Li

Keyword(s):

Vibration Control ◽

Magnetorheological Dampers ◽

Cable Vibration ◽

Fluid Leakage

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A Novel Magneto-Rheological Shock Absorber for Vibration Control

10.21236/ada392621 ◽

2001 ◽

Author(s):

Fararmarz Gordaninejad

Keyword(s):

Vibration Control ◽

Shock Absorber ◽

Magneto Rheological

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A Reliability Assessment Model for MR Damper Components within a Smart Structural Control Scheme

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.56.218 ◽

2008 ◽

Vol 56 ◽

pp. 218-224

Author(s):

Maguid H.M. Hassan

Keyword(s):

Structural Control ◽

Inverse Dynamics ◽

Mr Damper ◽

Assessment Model ◽

Resistance Force ◽

Mr Dampers ◽

Control Scheme ◽

Smart Control ◽

Control Devices ◽

Magneto Rheological

Smart control devices have gained a wide interest in the seismic research community in recent years. Such interest is triggered by the fact that these devices are capable of adjusting their characteristics and/or properties in order to counter act adverse effects. Magneto-Rheological (MR) dampers have emerged as one of a range of promising smart control devices, being considered for seismic applications. However, the reliability of such devices, as a component within a smart structural control scheme, still pause a viable question. In this paper, the reliability of MR dampers, employed as devices within a smart structural control system, is investigated. An integrated smart control setup is proposed for that purpose. The system comprises a smart controller, which employs a single MR damper to improve the seismic response of a single-degree-of-freedom system. The smart controller, in addition to, a model of the MR damper, is utilized in estimating the damper resistance force available to the system. On the other hand, an inverse dynamics model is utilized in evaluating the required damper resistance force necessary to maintain a predefined displacement pattern. The required and supplied forces are, then, utilized in evaluating the reliability of the MR damper. This is the first in a series of studies that aim to explore the effect of other smart control techniques such as, neural networks and neuro fuzzy controllers, on the reliability of MR dampers.

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Application of Magneto Rheological Dampers for Controlling Shock Loading

10.1115/imece1999-0100 ◽

1999 ◽

Author(s):

Mehdi Ahmadian ◽

James C. Poynor ◽

Jason M. Gooch

Keyword(s):

Dynamic System ◽

Shock Loading ◽

Closed Loop ◽

Shock Absorber ◽

Mr Damper ◽

Test Results ◽

Closed Loop System ◽

Mr Dampers ◽

Shock Dynamics ◽

Magneto Rheological

Abstract This study will examine the effectiveness of magneto-rheological (MR) dampers for controlling shock dynamics. Using a system that includes a 50-caliber rifle and a magneto-rheological damper, it is experimentally shown that MR dampers can be quite effective in controlling the compromise that commonly exists between shock forces and strokes across the shock absorber mechanism. A series of tests are conducted to demonstrate that different damping forces by the MR damper can result in different shock-force/stroke profiles. The test results further show that MR dampers can be used in a closed-loop system to adjust the shock loading characteristics in a manner that fits the dynamic system constraints and requirements.

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A Non Parametric Model for Magneto Rheological Dampers

Volume 7B: 17th Biennial Conference on Mechanical Vibration and Noise ◽

10.1115/detc99/vib-8017 ◽

1999 ◽

Author(s):

Mehdi Ahmadian ◽

Xubin Song

Keyword(s):

Test Data ◽

Mr Damper ◽

Parametric Model ◽

Parametric Models ◽

Magnetic Saturation ◽

Mr Dampers ◽

Electro Magnetic ◽

Magneto Rheological ◽

Force Characteristics ◽

Non Parametric

Abstract A non-parametric model for magneto-rheological (MR) dampers is presented. After discussing the merits of parametric and non-parametric models for MR dampers, the test data for a MR damper is used to develop a non-parametric model. The results of the model are compared with the test data to illustrate the accuracy of the model. The comparison shows that the non-parametric model is able to accurately predict the damper force characteristics, including the damper non-linearity and electro-magnetic saturation. It is further shown that the parametric model can be numerically solved more efficiently than the parametric models.

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