Experimental Performance of a Magnetorheological Fluid Damper

1997 ◽  
Author(s):  
Dan Kroushl ◽  
Amy Nesbit ◽  
Jin Kyoo Lee ◽  
Roy D. Marangoni ◽  
William W. Clark ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Squeeze Flow ◽  
Linear Vibration ◽  
Flow Properties ◽  
Vibration Damper ◽  
Experimental Performance ◽  
Mr Fluids ◽  
Fluid Damper ◽  
Mr Fluid Damper ◽  
Er Fluids

Abstract Magnetorheological (MR) and electrorheological (ER) fluids possess rheological or flow properties that can be controllably altered by the application of electric or magnetic fields, respectively. These fluids typically consist of dispersions of micrometer-sized dielectric or soft ferro (ferri) magnetic particles that become aligned in the presence of an external electric or electrical magnetic field, respectively. Such patterns in the material, which disappear when the field is removed, cause the material to resist mechanical deformation. This controllable property of the fluids allows them to be used in adaptive-passive actuators. This paper presents the results of a preliminary experimental investigation into the performance of the MR fluids in a linear vibration damper. A squeeze-flow MR fluid damper is used to suppress vibrations of a simply supported beam. Four different MR fluids are compared.

Study on Design Method for Magneto-Rheological Fluid Damper Based on Squeeze Mode and Experimental Tests

2011 ◽  
Vol 199-200 ◽  
pp. 97-101 ◽  
Author(s):  
Chang Rong Liao ◽  
Li Juan Fu ◽  
Ying Yang
Keyword(s):  
Analytical Method ◽  
Vibration Isolation ◽  
Squeeze Flow ◽  
Damping Force ◽  
Mr Fluid ◽  
Isolation System ◽  
Technical Requirements ◽  
Fluid Damper ◽  
Magneto Rheological ◽  
Mr Fluid Damper

A Magneto-rheological(MR) fluid damper based on squeeze model is put forward. The squeeze flow differential equation is obtained. Navier slip condition is considered on two boundary surfaces and compatible condition is established. The radial velocity profile and the radial pressure distributions are derived respectively. The mathematical expression of damping force is devloped. In order to verify rationality of analytical method, MR fluid damper based on squeeze mode is designed and fabricated according to technical requirements of engine vibration isolation system. The experimental damping forces from MTS870 Electro-hydraulic Servo with sine wave excitation show that analytical method proposed in this paper is feasible and has the reference value to design MR fluid damper based on squeeze mode.

Modeling and Analysis of Magnetorheological Fluid Damper under Impact Load

2012 ◽  
Vol 452-453 ◽  
pp. 1481-1485
Author(s):  
Shi Xing Zhu ◽  
Xin Liu ◽  
Li Ding
Keyword(s):  
Impact Load ◽  
Magnetorheological Fluid ◽  
Experimental Result ◽  
Bingham Model ◽  
Modeling And Analysis ◽  
Mr Fluids ◽  
Fluid Damper ◽  
Good Accordance ◽  
Simulation Results ◽  
Mr Fluid Damper

Modeling of a multi- ring grooves Magnetorheological（MR）fluid damper designed by ourselves were respectively carried out based on the Bingham model and the Herschel-Bulkley model. By comparing the simulation results of the two models with the true drop experimental result, it was proved that the Herschel-Bulkley model is in good accordance with the experiment and outperformed the Bingham model under high shear rate and high magnetic field. Furthermore, the parameter n in the Herschel-Bulkley model reflects the densification of the MR fluids, and by identifying and selecting the value of n better models and simulation results can be obtained.

DEVELOPMENT OF AN INTERACTIVE MR FLUID EXPERIMENT FOR SMART MATERIALS CURRICULA

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1478-1484
Author(s):  
R. BANNEROT ◽  
G. SONG
Keyword(s):  
Smart Materials ◽  
Resistance Level ◽  
Mr Fluid ◽  
University Of Houston ◽  
Mr Fluids ◽  
Hands On ◽  
Fluid Damper ◽  
Semi Solid ◽  
Magneto Rheological ◽  
Mr Fluid Damper

This paper presents the development of an interactive MR (Magneto-Rheological) fluid experiment. The hands-on experiment is developed to introduce MR fluids to students who are interested in this smart fluid. This apparatus is also used as a teaching tool for courses in smart materials. The experiment is designed to show students the basic operations of MR fluids and some common applications. This interactive experiment includes three devices with associated control buttons and all the devices are housed in a clear display case for easy visualization. 1) MR fluid morphing device, which clearly shows the morphing of MR material between fluid and semi-solid with the control of the electromagnet. 2) MR brake, which allow a user clearly feel the change of resistance level of the crank shaft with increasing of current to the electromagnets. 3) Vibration damping using MR fluid damper, which shows that the vibration of a platform induced by a rotating motor with an imbalanced mass can be suppressed by a simple MR fluid damper. This interactive experiment is fully autonomous and has been used in University of Houston. It has been demonstrated that it is an effective tool to assist student to learn MR fluids.

The Application of MR Fluid Damper to the Vibrating Screen as the Enhance of Screening Efficiency

2010 ◽  
Vol 97-101 ◽  
pp. 2628-2633 ◽  
Author(s):  
Gui Xia Zheng ◽  
Yi Jian Huang ◽  
Ben Gan
Keyword(s):  
Damping Ratio ◽  
Structural Damping ◽  
Construction Costs ◽  
Mr Fluid ◽  
Premature Failure ◽  
Vibrating Screen ◽  
Mr Fluids ◽  
Fluid Damper ◽  
Screening Efficiency ◽  
Mr Fluid Damper

Vibrating screens are subject to high levels of acceleration and often impart significant dynamic loads on plant buildings, especially in cases where more than one of these screens are employed in process applications. To avoid premature failure and reduce plant building construction costs in critical cases, a variety of techniques are applied in practice. Most of these require substantially increased system mass, which is undesirable because of cost and static loading. With this work the Magnetorheological (MR) fluids damper was used to alter the parameter of vibrating screen and improve the screening efficiency. The displacement signals of the vibrating screen with MR fluid damper were analyzed by using bispectrum (frequency domain) and time domain methods. It is demonstrated that damping and screening efficiency could be improved by using a MR Fluid damper for changing structural damping ratio. The results show that the vibrating screen has a better quality with improved screening efficiency and decreased vibration of the base frame.

PREPARATION AND MAGNETORHEOLOGICAL CHARACTERIZATION OF CI/PVB CORE/SHELL PARTICLE SUSPENDED MR FLUIDS

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4996-5002 ◽  
Author(s):  
J. L. YOU ◽  
B. J. PARK ◽  
H. J. CHOI ◽  
S. B. CHOI ◽  
M. S. JHON
Keyword(s):  
Magnetic Particles ◽  
Mineral Oil ◽  
Core Shell ◽  
Shell Microstructure ◽  
Flow Properties ◽  
Mr Fluids ◽  
Coating Layers ◽  
Plate Geometry ◽  
Vinyl Butyral

Hybrid magnetic particles of carbonyl iron ( CI ) /poly(vinyl butyral) ( PVB ) with core/shell microstructure ( CI - PVB ) were prepared in order to enhance the dispersion stability of the magnetorheological (MR) fluids. Since the composite particles of CI - PVB have a lower density than that of the pristine CI particles, they are regarded to improve the sedimentation problem of magnetic particles in the MR fluid when the particles are dispersed in a mineral oil and to make easy redispersion after caking. The PVB coating layers were found to play an important role in the steric repulsion between the relatively large CI particles. Morphology and composition of the CI - PVB particles were observed via SEM and TGA, respectively. Flow properties of both CI and CI - PVB based MR fluids were examined via a rotational rheometer in parallel plate geometry equipped with a magnetic field supplier.

Vibration Control of a Suspension System via a Magnetorheological Fluid Damper

2002 ◽  
Vol 8 (4) ◽  
pp. 527-547 ◽  
Author(s):  
C. Y. Lai ◽  
W. H. Liao
Keyword(s):  
Vibration Control ◽  
Active Control ◽  
Sliding Mode ◽  
Suspension System ◽  
Model Parameters ◽  
Suitable Model ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Fluid Damper ◽  
Mr Fluid Damper

Semi-active control systems are becoming more popular because they offer both the reliability of passive systems and the versatility of active control without imposing heavy power demands. It has been found that magneto-rheological (MR) fluids can be designed to be very effective vibration control actuators. The MR fluid damper is a semi-active control device that uses MR fluids to produce a controllable damping force. The objective of this paper is to study a single-degree-of-freedom suspension system with an MR fluid damper for the purpose of vibration control. A mathematical model for the MR fluid damper is adopted. The model is compared with experimental results for a prototype damper through finding suitable model parameters. In this study, a sliding mode controller is developed by considering loading uncertainty to result in a robust control system. Two kinds of excitations are inputted in order to investigate the performance of the suspension system. The vibration responses are evaluated in both time and frequency domains. Compared to the passive system, the acceleration of the sprung mass is significantly reduced for the system with a controlled MR damper. Under random excitation, the ability of the MR fluid damper to reduce both peak response and root-mean-square response is also shown.

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.

ER fluids in the squeeze-flow mode: an application to vibration isolation

1992 ◽  
Vol 28 (1) ◽  
pp. 89-94 ◽  
Author(s):  
R. Stanway ◽  
J.L. Sproston ◽  
M.J. Prendergast ◽  
J.R. Case ◽  
C.E. Wilne
Keyword(s):  
Vibration Isolation ◽  
Squeeze Flow ◽  
Flow Mode ◽  
Er Fluids
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