scholarly journals Experimental Investigation on Magnetorheological Damper for Seismic Resistance of Structures with Nano Fe3O4 MR Fluid

2016 ◽  
Vol 10 (2) ◽  
pp. 1-6 ◽  
Author(s):  
Daniel C ◽  
Ajitha Magdalene ◽  
Hemalatha G ◽  
Tensing D ◽  
Sundhar Manoharan S
Keyword(s):  
Experimental Investigation ◽  
Magnetorheological Damper ◽  
Seismic Resistance ◽  
Mr Fluid ◽  
Nano Fe3o4

A New Approach to the Modeling of Magnetorheological Dampers and Application to Resonance Control

2021 ◽  
Author(s):  
Dennis A. Siginer ◽  
Mario Letelier ◽  
Juan Sebastián Stockle Henríquez
Keyword(s):  
Flow Pattern ◽  
Yield Stress ◽  
A Priori ◽  
Time History ◽  
Magnetorheological Damper ◽  
Mr Fluid ◽  
Variable Resistance ◽  
History Of ◽  
Displacement Pattern ◽  
Analytical Tools

Abstract A predetermined flow pattern in a magnetorheological damper providing continuously variable resistance to flow is required for efficient damping of a given load. The required predetermined flow pattern rests on the a priori determination of the constitutive properties of the magnetorheological (MR) fluid determined to generate variable resistance to flow. The inverse problem of constructing the predetermined response of the damper with a specific displacement pattern of the piston in the damper for efficient damping of a given load is solved. The magnetorheological (MR) fluid in the damper is modeled as a Bingham phase change material with time dependent yield stress offering continuously variable resistance to the flow in the piston to achieve the required specific displacement pattern. The governing equations are solved for any time history of the dimensionless yield stress of the fluid which in turn is determined from the imposed response of the damper. Analytical tools developed can be used in optimizing damper performance. The application of the method to resonance mitigation is illustrated.

Experimental Investigation on Dynamic Characteristics of Magneto-Rheological Fluid Suspension through on Road Comfort Testing

2015 ◽  
Vol 772 ◽  
pp. 373-377
Author(s):  
K.G. Saravanan ◽  
N. Mohanasundara Raju
Keyword(s):  
Experimental Investigation ◽  
Ride Comfort ◽  
Vehicle Dynamic ◽  
Dynamic Approach ◽  
Mr Fluid ◽  
Road Profile ◽  
Fluid Damper ◽  
Magneto Rheological ◽  
Active Damper ◽  
Mr Fluid Damper

The present study deals with the application of the Magneto-Rheological (MR) fluid assisted semi-active damper as a replacement to the conventional suspension system in Maruti 800 car (source vehicle). MR fluid damper is designed, fabricated and automated with a microcontroller. This experimentation is carried out with real time instrumentation on the selected road profile as a vehicle dynamic approach. Results obtained from the travel imply that MR fluid suspension suppresses the vibrations more effectively than the existing passive damper system. The MR fluid dampens the acceleration and displacement of the piston to a greater extent thereby controlling the ride comfort.

scholarly journals Performance Simulation Analysis for Magnetorheological Damper with Internal Meandering Flow Valve

2018 ◽  
Vol 15 (3) ◽  
pp. 5511-5521
Author(s):  
Ahmad Zaifazlin Zainordin ◽  
Gigih Priyandoko ◽  
Zamri Mohamed
Keyword(s):  
Fluid Flow ◽  
Pressure Drop ◽  
Magnetic Flux ◽  
Flow Rate ◽  
Magnetorheological Damper ◽  
Magnetic Flux Density ◽  
Active System ◽  
Mr Fluid ◽  
Front Suspension ◽  
Femm Software

Magnetorheological (MR) damper as a semi-active system for a vehicle suspension is simulated in this study. The proposed design of Magnetorheological (MR) valve consists of meandering flow channel or gaps that fixed in the piston of the damper. The focus of this study is to estimate the performance of proposed MR valve based on actual front suspension parameter of a vehicle. Annular and radial gaps are combined to produce an MR valve with meandering fluid flow path. Furthermore, the damper is filled with Magnetorheological (MR) fluid to energize the damper under the presence of magnetic fields. The magnetic flux density within each gap is obtained via the Finite Element Method Magnetics (FEMM) software. Therefore, the yield stress of MR fluid and magnetic flux relationships both can be predicted. The present paper shows a reduction in pressure drop when the thickness of each gap is increased. Pressure drop is closely affected by the fluid flow rate that enters each gap. This means that the lower flow rate increases the pressure drop of MR valve at various current.

Experimental investigation into magnetorheological damper subjected to impact loads

2008 ◽  
Vol 14 (S1) ◽  
pp. 540-544 ◽  
Author(s):  
Hengbo Xiang ◽  
Qin Fang ◽  
Ziming Gong ◽  
Hao Wu
Keyword(s):  
Experimental Investigation ◽  
Magnetorheological Damper ◽  
Impact Loads

Enhancing the Seismic Resistance of Columns by GFRP Confinement Using Flexible Adhesive-Experimental Study

2014 ◽  
Vol 624 ◽  
pp. 478-485 ◽  
Author(s):  
Natalia Lasowicz ◽  
Arkadiusz Kwiecień ◽  
Robert Jankowski
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Dynamic Behaviour ◽  
Seismic Resistance ◽  
Dynamic Resistance ◽  
Damping Properties ◽  
Flexible Polymer ◽  
Polymer Adhesive

In this paper, the results of two experiments, focused on testing the effectiveness of a method of enhancing the seismic (dynamic) resistance of masonry columns with the use of flexible polymer adhesive, are shown. The first experiment was devoted to investigate the damping properties of a polymer working between two stiff layers, whereas the aim of the second one was to verify if the identified damping properties of the polymer can improve the dynamic behaviour of short masonry columns (prisms) strengthened by confinement made of GFRP grid bonded by the polymer adhesive. The results of the first stage of experimental investigation indicate that bonding two stiff elements with the analyzed polymer adhesive leads to the significant increase in overall damping properties. The results of the second experiment show that the GFRP grid confinement with flexible polymer adhesive is more effective than stiff epoxy and mineral adhesives.

Experimental Evaluation of Magnetorheological Damper Characteristics for Vibration Analysis

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
S. Siva Kumar ◽  
K.S. Raj Kumar ◽  
Navaneet Kumar
Keyword(s):  
Vibration Isolation ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Damping Force ◽  
Mr Fluid ◽  
Damping Characteristics ◽  
Fluid Damper ◽  
Mr Fluid Damper ◽  
Stiffness And Damping ◽  
Theoretical Results

Magnetorheological (MR) fluid damper has been designed, fabricated and tested to find the stiffness and damping characteristics. Experimentally the MR damper has been tested to analyse the behaviour of MR fluid as well as to obtain the stiffness for varying magnetic field. MR damper mathematical model has been developed for evaluating dynamic response for experimentally obtained parameters. The experimental results show that the increase of applied electric current in the MR damper, the damping force will increase remarkably up to the saturation value of current. The numerical simulation results that stiffness of the MR damper can be varied with the current value and increase the damping forces with the reduced amplitude of excitation. Experimental and theoretical results of the MR damper characteristics demonstrate that the developed MR damper can be used for vibration isolation and suppression.

Experimental Investigation of Multiple Coils Magnetorheological Damper under Dynamic Loadings

2014 ◽  
Vol 660 ◽  
pp. 863-867
Author(s):  
Izyan Iryani Mohd Yazid ◽  
Saiful Amri Mazlan ◽  
Takehito Kikuchi ◽  
Hairi Zamzuri
Keyword(s):  
Experimental Investigation ◽  
Mr Damper ◽  
Experimental Tests ◽  
Performance Comparison ◽  
Magnetorheological Damper ◽  
Applied Current ◽  
Damping Force ◽  
Dynamic Loadings ◽  
Experimental Parameters

This paper presents performance comparison of Magnetorheological (MR) damper with two different coil arrangements. Two coils at different location have been introduced that could enhance the activation areas in the MR damper. The experimental tests were conducted in three different conditions of coil; internal coils, external coils and the combination of coils. For each trial, the effect of the applied current and the condition of coils were analyzed and investigated. The results showed that the internal coil could produce higher damping force than the external coil, and the combination of internal and external coils could increase the damping force up to 125 N for the same experimental parameters.

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