Browsing by Author "Kariganaur, A.K."

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Comparative study on the effect of single coil and multi coil magnetorheological damper through finite element analysis
(IOP Publishing Ltd, 2020) Kariganaur, A.K.; Kumar, H.; Mahalingam, A.
Magnetorheological damper is vibration reducing system in which the magnetorheological fluid is the operating liquid which changes its behaviour with external stimulus by increasing the yield stress of fluid with the application of external magnetic field. Most of the vibration reducing equipment's is operated with single coil, and in this paper, study of multi coil magnetorheological damper is discussed and compared with the single coil for its magnetic flux density of the applied currents is studied by dividing equal and unequal number of turns of the coil in multi coil unlike in single coil damper. Â© Published under licence by IOP Publishing Ltd.
Effect of reduced geometric dimensions on torque generation in two plate rotor magnetorheological brake with in-house magnetorheological fluid
(Institute of Physics, 2023) Kariganaur, A.K.; Kadam, S.; Kumar, H.; Arun, M.
The present study is aimed to evaluate the torque generation capacity of a two plate rotor magnetorheological (MR) brake using in-house prepared MR fluid. The prepared MR fluids were studied for sedimentation rate at different temperatures and flow characterization at different currents and at specific temperatures. The yield stress of the fluid is explored through Herschel-Bulkley model. The results depict significant increase in sedimentation rate and decrease in yield stress with increase in temperature of the MR fluid. MR brake (model-1) is fabricated after finite element method magnetics exhibit magnetic field of approximately 0.145 T in the shear gap than other two models (model-2 and model-3) considered in this study. Characterization of the MR brake illustrates that there is an increase in torque with increasing current. Further tests have been carried out to identify the effect of sedimentation on torque generation at 52 °C after 15 h of sedimentation. The results indicate 16% reduction in the initial torque because of settling of particles. MR fluid and particles characterization illustrates that 322 °C and 400 °C are critical points in controlling the MR fluid input parameters. © 2023 IOP Publishing Ltd.
Experimental Investigation on Thermal Stability of Dual Particle Magnetorheological Fluid and Performance
(Taylor and Francis Ltd., 2024) Kariganaur, A.K.; Kumar, H.; Mahalingam, A.
Magnetorheological fluid and their properties are essential in Magnetorheological applications. The present study aims to obtain the thermally stable carrier fluid for Magnetorheological damper application through thermogravimetric analyses of three base fluids for higher stability fluid to synthesize Magnetorheological fluid. Scanning electron microscopic images of particles were also tested for their morphology. Magnetorheological fluid samples with 10%, 15%, and 20% by volume were prepared in-house with a 3% calcium base additive (base fluid). Sedimentation and thermal conductivity studies reveal that increasing particle concentration increases the settling time and thermal conductivity. The flow properties show an increase in yield stress with an increase in particle concentration and magnetic fields. The application part of the fluid consists of Magnetorheological damper fabrication and dynamic testing of 20% volume concentration particles at 10 mm amplitude, 2 Hertz frequency, and 0 Ampere and 0.5 Ampere currents, and the temperature of the system is captured with a K-type thermocouple. The results show an 8.2 °C rise at 0.5 Ampere with a 26.2% force decrease within 1000 cycles. The theoretical model based on the lumped parameter analysis predicts the temperature rise, similar to the experimental analysis with a 9.5% error. © 2023 Taylor & Francis Group, LLC.
Impact of increased particle concentration on magnetorheological fluid properties and their damping performance
(Korean Society of Rheology, Australian Society of Rheology, 2022) Kariganaur, A.K.; Kumar, H.; Arun, M.
Magnetorheological (MR) fluid properties are essential in analyzing the performance of any MR fluid system. The fluid properties are dependent on shape, size, and magnetic saturation of the magnetic particles. Preliminary characteristics with SEM, particle size analysis (PSA), and vibration sample magnetometer (VSM) on carbonyl iron particles were performed to verify the particle’s feasibility to synthesize the MR fluid in a laboratory. Synthesis and characterization of MR fluids with particle concentrations (PC) of 10% (PC10), 15% (PC15), 20% (PC20), 30% (PC30), and 35% (PC35) by volume are carried out. To show the inherent nonlinearity of the MR fluid, Herschel–Bulkley model is used. The relationship between sedimentation velocity, yield stress, and thermal conductivity is established as a function of particle concentration with experimental uncertainty of 6.15, 5, and 8.96%, respectively. Functional testing of PC15 and PC30 was carried out on an MR damper fabricated on dimensions obtained from the literature for the required size. The results indicate that damping force is 42% more in PC30 than PC15 at higher loading parameters. Finally, the saturation magnetization of the MR fluid depends not only on applied current but also on loading parameters when operating in the system. © 2022, Korean Society of Rheology.
Investigating the Effect of Material Properties and Geometric Design of Scaled Magneto-rheological Brake through FEMM
(United Scientific Group, 2023) Kadam, S.; Kariganaur, A.K.; Kumar, H.
Magneto-rheological (MR) brakes have enormous potential to replace conventional brakes because of their higher degree of controlling capability. With the help of magnetic field, MR brakes can be activated to provide braking. Appropriate material selection and geometric dimensions will maximize MR brakes’ performance. The present study focuses on determining higher magnetic permeable material to generate more magnetic induction in the fluid gap, along with finding geometric dimensions of the scaled (miniature sized) MR brakes (mass <2kg) through finite element analysis. Finite Element Method Magnetics (FEMM) software is a helpful tool for determining magnetic induction present in the MR gap. The influence of several magnetic and non-magnetic materials on disc-type MR brakes is examined. MR brake’s geometric dimensions significantly influence the magnetic induction in the fluid-filled MR gap, and the ideal material combination necessary for improved performance is identified. The geometric dimensions were selected by varying fluid gaps between 1-3 mm and rotor radius of 15 mm and 30 mm. The study examined two plate MR brake performance in the outer and inner MR fluid gaps using optimal materials and geometric dimensions obtained from the initial sections. © 2023 Kadam et al.
Torque generation in lightweight four rotor magnetorheological brake
(Springer, 2024) Kadam, S.; Kariganaur, A.K.; Kumar, H.
Non-Newtonian behaviour of the Magnetorheological (MR) fluid under the influence of external magnetic field can be commissioned to design various applications such as MR brake, damper, and clutches, etc. Better design strategies, material selection and characterization led to realize the potential of MR brakes to replace conventional brakes. The present study emphasises on developing lightweight (1.8 kg) multi-rotor MR brake (MMRB). Finite element method magnetics (FEMM) software is utilized to determine the material required for a single-rotor MRB. FEMM material selection analysis is incorporated into the modeled MMRB, and the nature of magnetic flux density throughout the MR gap was obtained. Magnetic circuit analysis of the proposed brake is carried out to find torque estimation using analytical equations and Bingham plastic model. The proposed brake is fabricated and characterized using commercial MRF (132 DG, Lord Corporation). The study compares the torque outputs obtained experimentally with finite element analysis (FEA) and analytical approach. The average maximum magnetic flux density through FE analysis is found to be 0.45 T @ 3 A current. The average error between FE obtained and experimentally obtained torque output of the brake is around 5%. Further, an alternate design is proposed by utilizing same rotor diameter and number of electromagnetic coils. The new design is lighter in weight (0.8 kg) and exhibits enhancement in the torque output and torque to weight ratio by around 31% and 55%, respectively than the present design. © Indian Academy of Sciences 2024.