Smart Materials Based on Ionic Liquids: the Magnetorheological Fluid Case

2009 ◽  
pp. 147-155
Author(s):  
Carlos Guerrero-Sanchez ◽  
Tina Erdmenger ◽  
Tania Lara-Ceniceros ◽  
Enrique Jimenez-Regalado ◽  
Ulrich S. Schuberta
Keyword(s):  
Ionic Liquids ◽  
Smart Materials ◽  
Magnetorheological Fluid

Wear Behavior of Rotary Lip Seal Operating in a Magnetorheological Fluid Under Magnetic Field Conditions

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Peng Zhang ◽  
Kwang-Hee Lee ◽  
Chul-Hee Lee
Keyword(s):  
Magnetic Field ◽  
Smart Materials ◽  
Wear Behavior ◽  
High Volume ◽  
Magnetorheological Fluid ◽  
Engine Oil ◽  
Wear Properties ◽  
Lip Seal ◽  
Sealing Performance ◽  
Stiffness And Damping

A magnetorheological fluid (MRF) is one of many smart materials that can be changed their rheological properties. The stiffness and damping characteristics of MRF can be changed when a magnetic field is applied. This technology has been successfully employed in various low and high volume applications, such as dampers, clutches, and active bearings, which are already in the market or are approaching production. As a result, the sealing performance of MRF has become increasingly important. In this study, the wear properties of seals with MRFs were evaluated by a rotary-type lip seal wear tester. The test was performed with and without a magnetic field. The leakage time was monitored during the tests in typical engine oil conditions. The results showed that the wear resistance of the seal with MRF was decreased under the magnetic field.

scholarly journals Geometry optimization of a magnetorheological clutch operated by coils

2016 ◽  
Vol 231 (1-2) ◽  
pp. 100-112 ◽  
Author(s):  
Francesco Bucchi ◽  
Paola Forte ◽  
Francesco Frendo
Keyword(s):  
Smart Materials ◽  
Magnetic Circuit ◽  
Geometry Optimization ◽  
Magnetorheological Fluid ◽  
Lumped Parameter Model ◽  
Finite Element Models ◽  
Optimal Geometry ◽  
Shock Absorbers ◽  
Lumped Parameter ◽  
Available Volume

Magnetorheological fluids are smart materials responsive to magnetic field, widely applied in dampers and shock absorbers but also in clutches and brakes. The magnetorheological fluid gap shape is a very important topic in the design of clutches, since it directly influences the transmissible torque and the power loss. In this paper, an approach to magnetorheological fluid clutch design based on optimization is proposed and tested on four different layouts. Starting from a given available volume, two magnetorheological fluid gap shapes, namely single cylinder and multi-disc, and two coils positions, i.e. internal or external, were considered. A lumped parameter model was developed to analytically compute the magnetic flux along the clutch magnetic circuit and to calculate the transmissible torque of the clutch. The optimal geometry of the clutch for maximum transmissible torque, in terms of number and dimensions of the coil sectors, was determined for each shape and coil configuration and the results were validated by finite element models.

Research Progress on Magnetorheological Fluid

2014 ◽  
Vol 633-634 ◽  
pp. 337-340 ◽  
Author(s):  
Yan Lan Li ◽  
Xing Quan Shen
Keyword(s):  
Smart Materials ◽  
Magnetorheological Fluid ◽  
Fast Response ◽  
Research Progress ◽  
Zero Field ◽  
Comprehensive Overview ◽  
Sedimentation Stability ◽  
Research Survey ◽  
New Type ◽  
Dynamic Yield

Magnetorheological fluid is a new type of smart materials taken seriously in recent years, which has good performance of sedimentation stability , high dynamic yield stress, easily dispersed , low zero-field viscosity , fast response time , wide operating temperature range. In the magnetic field, its rheological properties can be made quickly respond easily and reversible control and it has excellent prospects. This paper studies a more comprehensive overview of MRF conduct in the nearest 20 years. The presented content are: MRF research survey, composition, performance and prospects.

The Study on Shear Thinning Behavior of the Magnetorheological Fluid Under High Velocity Flow

2015 ◽  
Author(s):  
M. Hu ◽  
J. Wang ◽  
T. Shen ◽  
B. Liu ◽  
J. H. Wang
Keyword(s):  
Smart Materials ◽  
High Velocity ◽  
Pressure Difference ◽  
Research Result ◽  
Magnetorheological Fluid ◽  
Shear Thinning ◽  
High Velocity Flow ◽  
Shear Mechanism ◽  
Velocity Flow ◽  
Promising Application

As a kind of smart materials, the magnetorheological fluid (MRF) has a promising application for its excellent properties. In this paper, the shear thinning of the magnetorheological fluid (MRF) is analyzed from two aspects, firstly, the relation between the viscosity of MRF and the pressure difference between the inlet and the outlet of the tube is obtained based on the HB model; and then, the shear mechanism of shear thinning is analyzed from microcosmic viewpoint, by which the model of the shear thinning is established. What’s more, a effective method for calculating the MRF viscosity is proposed based on the hydrodynamics. The research result is verified by the experiments.

Research progress of field-induced soft smart materials

2018 ◽  
Vol 32 (18) ◽  
pp. 1840010 ◽  
Author(s):  
Han Wu ◽  
Zhi Chao Xu ◽  
Jin Bo Wu ◽  
Wei Jia Wen
Keyword(s):  
Magnetic Field ◽  
Smart Materials ◽  
Soft Matter ◽  
Soft Materials ◽  
Magnetorheological Fluid ◽  
Electrorheological Fluid ◽  
Research Area ◽  
Research Progress ◽  
Polymer Gel ◽  
Field Temperature

The field-induced soft smart materials are a kind of soft matter whose macroscopic properties (mechanical, or optical) can be significantly and actively controlled and manipulated by external fields such as magnetic field, electric field, temperature or light. In this paper, we briefly review the research and application progress of the field-induced soft smart materials in recent years and discuss the development problems and trend in this research area. In particular, we focus on three typical field-induced soft materials of smart materials: magnetorheological fluid, electrorheological fluid, and temperature and light sensitive polymer gel.

Synthesis of magnetorheological fluid and its application in a twin-tube valve mode automotive damper

2020 ◽  
Vol 234 (7) ◽  
pp. 1001-1016 ◽  
Author(s):  
Rangaraj Madhavrao Desai ◽  
Subash Acharya ◽  
Mohibb-e-Hussain Jamadar ◽  
Hemantha Kumar ◽  
Sharnappa Joladarashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Rheological Properties ◽  
Smart Materials ◽  
Dynamic Range ◽  
Experimental Testing ◽  
Testing Machine ◽  
Magnetorheological Fluid ◽  
Magnetorheological Damper ◽  
Geometrical Parameters ◽  
The Magnetic Field

The change in rheological properties of smart materials like magnetorheological fluid when brought under the influence of a magnetic field can be utilized to develop magnetorheological devices where the output has to be continuously and quickly varied using electronic control interface. In the present study, magnetorheological fluid is synthesized and used as a smart fluid in a twin-tube magnetorheological damper operating in valve mode. The behavior of the magnetorheological fluid is experimentally characterized in a rheometer and mathematically modeled using Herschel–Bulkley model. The parameters of the Herschel–Bulkley model are expressed as polynomial functions of strength of the magnetic field in order to find the shear stress developed by the magnetorheological fluid at any given strength of the magnetic field applied. The magnetorheological damper, which was designed for application in a passenger van, is tested in the damper testing machine. The performance of the damper at different damper velocities and current supplied is studied. The range of values for the parameters of the experimental testing are chosen to emulate the actual conditions of operation in its intended application. Nondimensional analysis is performed, which links magnetorheological fluid rheological properties and geometrical parameters of magnetorheological damper design with the force developed by the damper. Finite element method magnetics is used to find the strength of the magnetic field at the fluid flow gap. Analytical methods are used to calculate the damper force developed due to the field-dependent yield stress and compared with experimental force values. The resulting dynamic range of the magnetorheological damper is also assessed.

scholarly journals THEORETICAL QUESTIONS OF APPLYING SMART MATERIALS FOR MICROACTUATORS / TEORINIAI IŠMANIOJO SKYSČIO TAIKYMO MIKROPAVAROMS KLAUSIMAI

2013 ◽  
Vol 6 (4) ◽  
pp. 541-545
Author(s):  
Andrius Klevinskis ◽  
Vytautas Bučinskas ◽  
Lukas Daujotas
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Materials ◽  
Smart Materials ◽  
Theoretical Calculations ◽  
Magnetorheological Fluid ◽  
Magnetic Liquid ◽  
Operating Modes ◽  
Essential Properties ◽  
Main Operating

The article provides an overview of smart magnetic materials, including the essential properties of smart magnetic liquid materials and discusses the main operating modes of these materials. Theoretical calculations have disclosed changes in the behavior of the magnetorheological fluid determined under the influence of an external magnetic field of the microactuator. Finally, the paper presents the results and conclusions of the conduced experiments. Santrauka Darbe apžvelgtos išmaniosios magnetinės medžiagos, pateiktos pagrindinės išmaniųjų magnetinių skysčių charakteristikos, aptarti pagrindiniai šių medžiagų darbo režimai. Teoriniais skaičiavimais nustatyta mikropavaroje veikiančio magnetoreologinio skysčio savybių kitimo priklausomybė nuo išorinio magnetinio lauko. Darbe pateikti tyrimo metu gautų rezultatų grafikai ir išvados.

The Role of Anions on Light-Driven Conductivity in Diarylethene-Containing Polymeric Ionic Liquids

2021 ◽  
Author(s):  
Nie Hui ◽  
Nicole S Schauser ◽  
Neil D Dolinski ◽  
Zhishuai Geng ◽  
Saejin Oh ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Smart Materials ◽  
Polymeric Ionic Liquids ◽  
New Class ◽  
Potential Applications ◽  
Soft Electronics

Polymeric ionic liquids (PILs) with light-driven conductivity represent a new class of smart materials with potential applications as soft electronics, however the influence of counterion characteristics on their conducting properties...

Design and Experimental Analysis of a Biomedical Prosthetic Knee With Magnetorheological Fluid

2015 ◽  
Author(s):  
The Nguyen ◽  
Alan Suarez ◽  
Saurabh Bapat
Keyword(s):  
Smart Materials ◽  
Theoretical Models ◽  
Magnetorheological Fluid ◽  
Gap Size ◽  
Electric Motors ◽  
Mr Fluid ◽  
Prosthetic Knee ◽  
The Family ◽  
Braking Torque ◽  
Improved Design

Current prosthetic legs rely on technology that is inefficient. Electric motors used today require high amounts of current to operate. Prostheses utilizing smart materials, including magnetorheological fluid (MRF), require less power to operate effectively. In this study, the MR fluid knee was designed for above the knee amputees. The design was in the family of MR fluid brake/clutch as it provides simple design and good MR fluid uniformity. However, this MR knee design is different from any existing MR brake, featuring a novel non-circular rotor. Three fourths of the rotor, considered circular, has the same radius, and the remaining quarter has a varying radius to provide a variable gap size between the rotor and stator. This feature allows the MR fluid to experience a stronger magnetic field as the knee rotates, resulting in a variable braking torque. At this stage of research, the first working prototype of the proposed MR fluid knee was built and tested to determine the braking torque profile. Corresponding theoretical models were also created. The calculated torque was used to predict the performance of the MRF knee. The experiments has been conducted to examine the MRF knee performance and to compare with the theoretical model. The knee was expected to use less power to operate and provided the necessary braking torque required by an average male human body. An improved design was planned for weight reduction and optimization to allow the commercialization of the MRF knee.

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