China
Africa
Explore chapters and articles related to this topic
Design of a Low-Cost Prosthetic Leg Using Magnetorheological Fluid
Published in Ashwani Kumar, Mangey Ram, Yogesh Kumar Singla, Advanced Materials for Biomechanical Applications, 2022
Ganapati Shastry, T. Jagadeesha, Ashish Toby, Seung-Bok Choi, Vikram G. Kamble
MR fluid or magnetorheological fluid is a smart material that changes its viscosity and shear stress according to its magnetic field [7]. A piston-cylinder mechanism can provide adequate damping force and the torque at the knee necessary for walking properly when used inside a damper. Apart from this, the MR damper serves another purpose. Fluid is present inside the knee in a natural human leg that provides damping or shocking absorption while walking. An amputated leg would not have this. Therefore, with the help of an MR damper, this can also be achieved [4–6,8–11]. The semi-active prostheses are more flexible than the passive ones and are also not as expensive as the active ones. Such prostheses can be made using semi-active controllers like MR dampers.
Synthesis, characterization and applications of magnetorheological fluid
Published in Alka Mahajan, Parul Patel, Priyanka Sharma, Technologies for Sustainable Development, 2020
Hiren Prajapati*, Absar Lakdawala
The rheological nature of MRF converts the passive system into semi active or active system. The working range of the system becomes dynamic with the use of MRF. Most common applications Magnetorheological Dampers (MR Damper) are in automobile suspension, washing machine, prosthetic knee, gun recoiling protection pad, seismic dampers, cable stayed bridge (Dongting Lake) etc. (Carlson 2002), (Gadekar 2017) Magnetorheological fluids also find their application in brakes. Magnetorheological brakes consist stator (Hollow circular casing), rotor (Non-magnetic Rotating disc) and current coils on periphery of rotating disc. When current is flowing through current carrying coils then it will generate magnetic field lines and suspended magnetic particles in MRF will align themselves. This alignment will raise the viscosity and provide braking torque. (Kumbhar 2015) Processing of materials like optical glass and sapphire is difficult. However causing flow of MRF along with abrasive particles through rotating electromagnetic wheel and brittle material gives good surface finish. This has made MRF applicable in superfinishing processes. (Sidpara 2009).
Magnetizable Fluids
Published in Leslie R. Rudnick, Synthetics, Mineral Oils, and Bio-Based Lubricants, 2020
Tom Black, J. David Carlson, Daniel E. Barber
Magnetorheological fluids and devices have been successfully commercialized since the mid-1990s. A number of these applications are described later in the chapter. The holy grail of a mass-produced “smart” MR fluid automotive shock absorber system was finally realized in the early 2002, with the introduction of the MagneRide suspension system as the standard equipment on the Cadillac Seville STS with MR fluid made by LORD Corporation [27], and shock absorbers and struts made by Delphi Corporation [26,28]. MR shock absorbers now appear on more than a dozen models from multiple auto makers including Audi, Ferrari, GM, and Holden Special Vehicles [29,30], and in 2009 the MagneRide system was recognized as first among the top 25 innovations from 15 years of PACE award winners [31]. In 2014, MagneRide was introduced on several Cadillac, Chevrolet, and GMC truck and SUV platforms.
Automated insular surface finishing by ball end magnetorheological finishing process
Published in Materials and Manufacturing Processes, 2022
Faiz Iqbal, Zafar Alam, Dilshad Ahmad Khan, Sunil Jha
The past decade has seen a huge amount of progress toward magnetorheological fluid applications to finish internal surfaces,[18] complex geometries, and different materials. However, finishing applications such as insular finishing has been given little attention and there is no to very little evidence in the literature that can show efforts toward efficient insular finishing, which makes the work presented in this article a novel approach. The need for insular finishing arises from the need for products of varying roughnesses such as dyes and molds having different shapes embedded on them. Insular finishing is also needed to eliminate contour errors, geometric errors, and errors from grinding sources[19] such as linearity error in positioners of grinding setups, leading to surfaces having regions of varying surface roughnesses. The BEMRF process due to its capability of modular tool tips accommodating various sizes of tool tips ranging from 5 mm diameter to 15 mm diameter that can cover smaller areas to finish, also due to its ability to control the forces during the finishing process to produce gentle to stiff finishing forces within one workpiece of varying surface roughnesses, is ideal for insular finishing. This insular finishing of surfaces using the BEMRF process, however, gives rise to the need for an automated system for measuring the surface roughness integrated within the BEMRF setup to avoid potential systematic errors induced by repeated removal of the workpiece from the fixture.
Convective heat transport in yield stress nanofluids in a differentially heated square enclosure
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Naushad Hasin Khan, Md Ashique Hassan
Smart fluids, such as electrorheological and magnetorheological fluids, are utilized in many practical applications for example brakes, clutches, dampers, etc. Further, smart fluids (Elsaady, Oyadiji, and Nasser 2020; Gertzos, Nikolakopoulos, and Papadopoulos 2008) as well as drilling fluids (Wang, Guo, and Chen 2020) can be considered as yield stress fluid and modeled with Bingham rheological relation. Rapid cooling is desired from these yield stress fluids. Mixing of nanoparticles in these fluids could be an approach to enhance the cooling efficiency. Nanoparticle blended yield stress fluid is termed as yield stress nanofluid. To our knowledge, investigation of heat and fluid flow characteristics in yield stress nanofluid by considering Rayleigh Benard convection lacks in literature. Therefore, this work is motivated to fill this research gap. Study of natural convection in yield stress nanofluid filled differentially heated rectangular enclosure has been carried out. The rheology of the test fluid is modeled by Regularized Bingham relation. The sample fluids are seeded with multi-walled carbon nanotube (MWCNT). Effects of Rayleigh number, yield stress, nanoparticle volume fractions and Prandtl number on the natural convection of yield stress nanofluid have been investigated using finite volume-based algorithm.
Dynamic behavior of sandwich beams with different compositions of magnetorheological fluid core
Published in International Journal of Smart and Nano Materials, 2021
Subash Acharya, Vipin J Allien, Puneet N P, Hemantha Kumar
Magnetorheological fluids belong to a class of smart materials and consists of micron-sized (preferably less than 10 microns) magnetizable particles (mainly iron particles) suspended in carrier fluid such as silicone oil, polyalphaolefin oil, etc with small amounts of suitable additives. The properties of MRF can be enhanced by application of magnetic field and its original properties can be restored when field is removed. This is due to dipole moment induced in the iron particles and leads to orientation of these particles along the magnetic field. This property change occurs in a fraction of a second [1]. This smart property has been used and investigated in several applications by many researchers [2–5] although it has been successfully implemented in few applications such as MR dampers for suspensions, seats, mounts, prosthetics, MR brakes, tactile feedback device, MR dampers for buildings and bridges [6,7].