Qualification: 
Ph.D
bala@am.amrita.edu

Dr. Balakrishnan Shankar is the Associate Dean for the School of Engineering at Amritapuri campus. He currently serves as a Professor, Head of the Department and the Chairperson at the Department of Mechanical Engineering at Amrita School of Engineering, Amritapuri. His research interest includes Materials Science. Dr. Balakrishnan Shankar received his Ph. D. from University of Texas at Austin, USA.

Publications

Publication Type: Journal Article

Year of Publication Publication Type Title

2018

Journal Article

Sankar S. Menon, Radhu Krishna, Lida Wilson, Sreedha Sambhudevan, B. Shankar, Anshida Mayeen, and Nandakumar Kalarikkal, “Magnetic and dielectric properties of nickel-ferrite-embedded natural rubber composites”, Polymer Bulletin, vol. 75, pp. 5217–5234, 2018.[Abstract]


Spinel-structured nickel ferrite has been prepared using co-precipitation method. The ferrite particles prepared were characterized using XRD, FTIR, and TEM and were confirmed to be in the nano-regime. Natural rubber composites were prepared with different loadings of nickel ferrite like 5, 15, 25, 50, and 75 (in part per hundred rubber, phr). The mechanical, swelling, and magnetic properties were analyzed using the standard methods. Dielectric measurements show that permittivity decreases with increase in frequency and increases with increase in ferrite loading. Tan delta value also was found to increase with filler loading which may be attributed to the presence of interfacial polarization.

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2018

Journal Article

V. Anjana, Sara John, Pooja Prakash, Amritha M Nair, Aravind R Nair, Sreedha Sambhudevan, and B. Shankar, “Magnetic Properties of Copper Doped Nickel Ferrite Nanoparticles Synthesized by Co Precipitation Method”, IOP Conference Series: Materials Science and Engineering, vol. 310, p. 012024, 2018.[Abstract]


Nickel ferrite nanoparticles with copper atoms as dopant have been prepared using co-precipitation method with general formula Ni 1-x Cu x Fe 2 O 4 (x=0.2, 0.4, 0.6, 0.8 and 1) and are sintered at quite ambient temperature. Structural and magnetic properties were examined using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction method (XRD) and Vibrating Sample Magnetometer (VSM) to study the influence of copper doping in nickel ferrite magnetic nanoparticles. X-ray studies proves that the particles are possessing single phase spinel structure with an average particle size calculated using Debye Scherer formula. Magnetic measurements reveal that saturation magnetization value (M s ) decreases while magnetic coercivity (H c ) increases upon doping.

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2015

Journal Article

A. S, VJ, U., Kalathil, S. T., Simon, A., CM, H., Mathew, D. P., Maya Menon, Basil, P., Ramachandran, R., Sengar, A., Balakrishnan, A., Dutt, K., Murali, A., Tilak, C. Krishna, Suresh, A., Suresh, A., B. Shankar, and Dr. Ganesh Udupa, “Design and Development of an Intelligent Rover for Mars Exploration (Updated)”, The Mars Society with permission, 2015.[Abstract]


The paper describes various issues faced by rover in an alien environment and attempts to solve each of them using innovative design modifications. The rover features a bioinspired eight-wheeled drive mechanism, an integrated robotic arm and a stereo vision technique for advanced image processing. The system control, for both the rover as well the robotic arm, is done using microcontrollers and microprocessors such as Arduino, Intel NUC, and Raspberry Pi. Inspired from nature, a reflex mechanism has also been integrated into the rover design to minimize damage, by automated safety reflexes. The arm is so designed to switch between three different end effectors depending upon the task to be performed. The 8-wheeled rover combines the rocker bogie mechanism and four rocker wheels and four spider-leg wheels. The spider-legs ensures that it can traverse over a considerable height greater than the chassis height which could be as much as thrice the diameter of the wheels, whereas the current NASAS curiosity rocker bogie system can only traverse over a height twice the diameter of the wheel. Additionally, as they are actuatorpowered, the slope of the rover can be adjusted in such a way that it does not topple for a wide range of inclination and allows the rover to traverse over highly rugged terrain. It provides a large amount of traction with the ground even in terrains where there is a negative slope or vertical drop of around 1m using a springdamper suspension mechanism whereas the rocker bogie mechanism provides traction only due to its body weight The Rover finds applications in the exploration of other planets, deep sea vents

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Publication Type: Conference Paper

Year of Publication Publication Type Title

2017

Conference Paper

Sreedha Sambhudevan and B. Shankar, “Development of medical imaging X-ray shielding materials based on natural rubber/nano composites-thermal degradation studies”, in 2017 International Conference on Intelligent Sustainable Systems (ICISS), Palladam, India, 2017.[Abstract]


This paper discusses the development of X-ray shielding materials based on rare earth oxide and natural rubber materials. Medical imaging, as we know is currently using highly toxic lead containing garment for protection from harmful radiations. Both technicians as well as patients are suffering from the ill effects of radiation exposure to a great extent. The current research presented in this paper can be an alternative to the above mentioned problems. Rare earth oxide was used as filler in natural rubber matrix to prepare eco-friendly composites. The samples were analyzed to confirm the particle size, even distribution in matrix phase, mechanical properties and their response to high temperature conditions.

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2017

Conference Paper

J. Freeman, B. Shankar, and G. Sundaram, “Inverse kinematics of a dual linear actuator pitch/roll heliostat”, in AIP Conference Proceedings, 2017, vol. 1850.[Abstract]


This work presents a simple, computationally efficient inverse kinematics solution for a pitch/roll heliostat using two linear actuators. The heliostat design and kinematics have been developed, modeled and tested using computer simulation software. A physical heliostat prototype was fabricated to validate the theoretical computations and data. Pitch/roll heliostats have numerous advantages including reduced cost potential and reduced space requirements, with a primary disadvantage being the significantly more complicated kinematics, which are solved here. Novel methods are applied to simplify the inverse kinematics problem which could be applied to other similar problems. © 2017 Author(s).

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