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Magnetorheological fluid

About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.


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Journal ArticleDOI
TL;DR: In this paper, the response times of magnetorheological fluids and magnetic fluid valves are studied under various flow configurations, and two types of valving geometries, annular flow and r...
Abstract: In this study, the response times of magnetorheological fluids and magnetorheological fluid valves are studied under various flow configurations. Two types of valving geometries, annular flow and r...

45 citations

Journal ArticleDOI
TL;DR: A permanent magnetic yoke with a straight air gap was developed as the magnetic excitation unit, in order to improve the efficiency of magnetorheological (MR) polishing for ultra-smooth surface planarization.
Abstract: A permanent magnetic yoke with a straight air gap was developed as the magnetic excitation unit, in order to improve the efficiency of magnetorheological (MR) polishing for ultra-smooth surface planarization. Finite element modelling was used to simulate the magnetic performance of the newly developed yoke, which was found to agree well with the experimental measurement. With the developed MR polishing apparatus, the effects of trough speed, work and excitation gap width, particle concentration within the MR fluid and workpiece size on the material removal rate were systematically investigated. Final tests were performed on glass specimens to examine the polishing performance. The polishing area in the developed process was much larger than that of the conventional MR finishing process with a carrier wheel and ultra-smooth surface of 1 nm in R-a was achieved. (C) 2014 Elsevier Inc. All rights reserved.

45 citations

Journal ArticleDOI
TL;DR: In this article, a number of semi-active control algorithms namely modified skyhook, modified groundhook and modified hybrid skyhook-groundhook controllers are evaluated to be used with a magnetorheological damper.
Abstract: Semi-active dampers change their damping force in real time by simply changing the damping coefficient according to a control policy. In this study, a number of semi-active control algorithms namely modified skyhook, modified groundhook and modified hybrid skyhook-groundhook controllers are evaluated to be used with a magnetorheological damper. The effectiveness of these control algorithms in disturbance rejection are investigated along with their ability to consistently provide the target force in the same direction with the damper velocity to overcome the damper constraint. From the simulation and experimental results, the modified hybrid skyhook-groundhook controller shows significant improvement in body acceleration, body displacement, suspension displacement without allowing excessive wheel acceleration magnitude. The modified hybrid skyhook-groundhook controller is also superior to the counterparts in overcoming the damper constraint by producing the target forces consistently in the same sign with the damper velocity.

45 citations

Journal ArticleDOI
TL;DR: Wang et al. as mentioned in this paper investigated the impact of temperature on the rheological properties of magnetorheological (MR) grease containing carbonyl iron suspended in lithium-based grease within the temperature range from 10°C to 70°C under influence of temperature.
Abstract: Huixing Wang1, Yancheng Li2,3, Guang Zhang1, Jiong Wang1 1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, People’s Republic of China 2. School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo 2007, Australia 3. College of Civil Engineering, Nanjing Tech University, Nanjing 211800, People’s Republic of China Corresponding author: wjiongz@njust.edu.cn; yancheng.li@uts.edu.au Abstract This paper investigates the impact of temperature on the rheological properties of magnetorheological (MR) grease containing carbonyl iron suspended in lithium-based grease within the temperature range from 10°C to 70°Cunder influence of temperature, i.e. from 10°C to 70°C. Lithium-based MR grease with 70% weight fraction of carbonyl iron has beenis firstly prepared by mechanical mixing. The apparent viscosity and shear stress as a function of shear rate under different temperatures and magnetic field strengths are measured and discussed. It is found that the influence of temperature on apparent viscosity is reducingreduces with the increase of magnetic field strength. In addition, in the presence of magnetic field, maximum yield stress gets demonstrates an increase as temperature increases from 50°C to 60°C. The dynamic properties of MR grease are obtained under oscillatory shear test. The influences of strain amplitude, driving frequency and magnetic field on the dynamic properties of MR grease at different temperature are discussed. The results demonstrate that the enhancement of temperature leads to the increase of storage modulus and the reduction of the loss factor. Microstructural variation of grease matrix at different temperature is proposed as an explanation of the rheological changes of MR grease.

45 citations

Journal ArticleDOI
TL;DR: In this article, a radial flowmode magneto-rheological (MR) fluid damper comprising a permanent magnet and an electromagnet is designed, built and tested, which provides softer damping properties by cancelling the effect of the permanent magnet, while at the same time enhancing the field effect, resulting in a harder damping device.
Abstract: In this paper, a disc type, radial flow-mode magneto-rheological (MR) fluid damper comprising a permanent magnet and an electromagnet is designed, built and tested. The proposed MR fluid damper has an MR valve with which two-way controllability through cancellation or enhancement of the magnetic field is obtained. This added feature provides damping forces less than or greater than that of a passive viscous original equipment manufacturer damper. A three-dimensional electromagnetic finite element analysis has been performed to realize this unique function in the proposed design. Experimental and theoretical studies have been conducted in order to demonstrate that this new design can provide softer damping properties by cancelling the effect of the permanent magnet, while at the same time enhancing the field effect, resulting in a harder damping device. Softer and harder damping refer to decrease and increase in the damping, respectively.

45 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023283
2022678
2021419
2020512
2019652