MIT-World Peace University (MIT-WPU) is a top educational institute located in Pune, India. It is recognized within&nbsp;UGC under Government of Maharashtra Act No. XXXV 2017.&nbsp;

It is part of the MIT group of institutions (established in 1983) which covers 10+ campuses across India and has more than 50,000+ students enrolled across various disciplines at a given point of time. The institute houses 15 schools ranging from Engineering &amp; Technology, Design, Pharmacy, Commerce, Governance among others. It offers undergraduate, postgraduate and PhD programs among different disciplines.&nbsp;

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MIT World Peace University

An exoskeleton is a mechanism that works as an external skeleton to assist the human body in daily tasks, rehabilitation, and strengthening. A lot of active exoskeletons have been developed in order to provide assistance to the human body while walking or running. However, developing an unpowered exoskeleton can reduce the human efforts while running is something that requires more attention. The goal is to create a lower limb assistive exoskeleton that will allow people to run while spending as little energy as possible and which is affordable and can be worn easily. The design is entirely mechanical (passive), which means it does not rely on any external electrical energy inputs. This article discusses the design and testing of waist supportive passive exoskeleton for human comfort. Exoskeleton was designed by using silicon-chromium spring steel for manufacturing of leaf spring. The leaf spring was with 50 mm width and 1 mm thick. Total weight of the exoskeleton was 1.5 kg. The stiffness of leaf spring was 56.19 Nm/rad. It has been observed that the proposed design is more comfortable to human beings while running. Composite Materials can be used for manufacturing of various parts of the passive exoskeleton to reduce its overall weight and enhance Mechanical Properties. © 2022

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School of Mechanical Engineering

Engineering and Technology

Materials Today: Proceedings

Experimental investigations on waist supportive passive exoskeleton to improve human comfort

Sugarcane is the prime crop of Indian agricultural market. Sugarcane resembles 80% of sugar made all across the globe. The process of harvesting of sugarcane becomes easier with the help of machines. Still there are some processes in agriculture that require special care while atomizing. Like sowing a sugarcane crop seed. This sowing of seed required careful cutting of sugarcane stalk. There are semiautomatic machines now days available for this purpose, but these machines are indirectly damaging the bud of sugarcane. To avoid this happening the design of new semiautomatic machine is presented in this research paper. The machine is designed not to harm the bud of sugarcane without compromising on its efficiency. The model cuts one bud per two second. This matches with the current machines in market with decrease in cost. This machine costs 20,360 INR. Where market survey gives cost of 40,000 INR for similar machine. Fabricated machine gives 1800 number of buds in an hour. Satisfying the performance criteria. This machine reduces the labor work of farmers which better safety at reasonable price. © 2022

Design and fabrication of semiautomatic sugarcane bud cutting machine

The main aim of the this work is to design and develop a suitable mechanism to finish the hard surfaces and improve the performance of finishing processes based on MR fluid using external magnetic field. This work is carried out by considering the significant process parameters like the concentration ratio of CIPs to aluminum oxide (Al2O3) as an abrasives, magnetizing current, the rotating speed of the tool, feed rate of workpiece, working gap and hardness of work pieces to know the response as a percentage change in surface roughness Ra. SEM technique is employed to know the surface integrity and understand the performance of MR fluid based finishing process over the surface of die steel materials. While, performing the experimental work, a full factorial design is applied and the results are characterized using regression and ANOVA technique. It is revealed from the results that the foremost contribution of the factors in the highest order are working gap, magnetizing current and the hardness of the work piece followed by the ratio of CIP to Al2O3 abrasives, feed rate and rotating speed of the tool in improving the surface roughness Ra. The regression model confirms the linear relationship between observed Ra and the predicted Ra and its correlation coefficient is + 0.85. The average percentage deviation is 3.56 within 5% error band. Thus, this method is capable to obtain the Nano finishing over the surface of hardened materials

Experimental investigation of parameters and surface integrity of die steel based on MR fluid finishing process

In this work, a new finishing process has been proposed for polishing a work piece made of AISI D3 steel material with the use of magnetorheological (MR) fluid as working medium. Magnetorheological fluid finishing process is considered as one of the important non-conventional methods for polishing the complicated shapes as well as hard material components. The experimentation is carried out on predominating factors like the ratio of CIPs to Al2O3 abrasive particles, magnetizing current, the rotating speed of the tool, feed rate of work piece, working gap and hardness of work pieces to get the response as a percentage change in surface roughness. To design the experiments, a full factorial design is employed and the results are analyzed with the help of regression and ANOVA method. The results of experimentation reveal that the major contribution of the parameters to improve the surface finish is of working gap, current applied to the electromagnet and the hardness of the workpiece followed by the rotating speed of the tool, the ratio of CIP to abrasive and feed rate of the workpiece. Further, results showed that the average percentage deviation between the observed and the predicted value is less than 4%. © Springer Nature Singapore Pte Ltd. 2020.

Advances in Intelligent Systems and Computing

Experimental Study of Process Parameters on Finishing of AISI D3 Steel Using Magnetorheological Fluid

The main objective of the present work is to develop a novel finishing process to polish the die steel materials with the use of magnetorheological fluid and also to investigate the effects of the input process parameters such as concentration of CIPs and abrasive particles (Al2O3), magnetizing current, speed of rotating tool, feed rate, working gap and hardness of workpiece on the response of surface roughness (Ra). In view of this, a novel MR fluid-based finishing setup is developed to characterize the process performance. Based on the method of full factorial design with two levels, 64 experiments are conducted on CNC vertical machining center with the customized setup. The results of the response are formulated by applying the ANOVA, and a mathematical model is established using linear regression to predict the response Ra. Capacity of the newly developed process is proven to achieve the surface finish on the hardness of 65 HRC D3 materials from 0.156 to 0.081 µm with the duration of polishing 10 min. The result of the experiments reveals that the major contributions of the parameters to improve the surface finish are working gap, magnetized current, and the hardness of the work piece, and followed by the rotating speed of tool, the ratio of CIP to abrasive, and feed rate of the work piece. The average percentage deviation between the predicted and observed surface roughness values is 3.56 within the band of 5% error. Scanning electron microscopy (SEM) is applied to characterize the integrity of the surface and testifies the efficacy of the developed MR fluid process to obtain a nano-level surface finish on the die steel material.

Journal of Bio- and Tribo-Corrosion

Experimental Characterization of Surface Roughness UsingMagnetorheological Abrasive Flow Finishing Process on AISI D3 Steel

The main aim of this study was to experimentally investigate and analyze the behavior of various process parameters like the ratio of concentration of CIPs and Al2O3 abrasives, the current supplied to the electromagnet, rotating speed of tool, feed rate of the workpiece, the working gap between rotating tool and the workpiece surface, and workpiece hardnesses of AISI D3 steel material on the response of surface roughness, Ra and difference between initial surface roughness and final surface roughness obtained using magnetorheological fluid based finishing process. Also possible reasons for trends have been proposed through extensive trials and examination. These initial values form the basis of selection of ranges for each parameter for the further process characterization and optimization for improving the finishing performance of the MR fluid assisted process. The experimentation was carried out on the vertical machining center (VMC) machine with customized setup

International Journal for Research in Engineering Application & Management

Investigating the Behavior of Parameters using Magnetorheological Abrasive Flow Finishing Process

The recent engineering applications demand the use of tough, high intensity and high temperature resistant materials in technology, which evolved the need for newer and better finishing techniques. The conventional machining or finishing methods are not workable for the hard materials like carbides; ceramics, die steel. Magnetorheological fluid assisted finishing process is a new technique under development and becoming popular in this epoch. With the use of external magnetic field, the rheological properties of the MR fluid can be controlled for polishing the surfaces of components. An extended survey of the material removal mechanism and subsequent evolution of analytical MR models are necessary for raising the finishing operation of the MR fluid process. Understanding the influence of various process parameters on the process performance measures such as surface finish and material removal rate. The objective of this study is to do a comprehensive, critical and extensive review of various material removal models based on MR fluid in terms of experimental mechanism, finding the effects of process parameters, characterization and rheological properties of MR fluid. This paper deals with various advancements in MR fluid based process and its allied processes have been discussed in the making the developments in the future in these processes.

Journal of Emerging Technologies and Innovative Research

A REVIEW ON RECENT DEVELOPMENTS IN MAGNETORHEOLOGICAL FLUID BASED FINISHING PROCESSES

The use of magnetic field in the control of manufacturing processes has become prime interest in the last few decades. In magneto rheological abrasive flow finishing process, magnetic force plays a significant role in finishing the surface of work pieces. In the present work, experimental study was carried to investigate the working ranges and to determine the effect of process parameters on the surface of mild steel material. Four independent parameters were studied such as time, voltage, current and rotating speed of tool along with two different abrasive powders on the performance measures like surface roughness in the process. A rotating coil electromagnet was designed and implemented to use with plane surfaces. So, in order to establish the process, the experimental set up was developed on which various trials have been conducted by considering the various shape of the tools and electromagnets also varying the A.C. supply for assessing the performance of MRAFF process. The measurement of the final surface roughness was taken with the help of contact type Model- Surtornic-25, Taylor Hobson make Mechanical Profiler. It was observed that the surface roughness decreases with increasing the percentage of polishing abrasives up to certain limit thereafter it starts decreasing. The relative increase depends upon the amount and type of abrasives used. Hence the improvement in surface roughness is considered as an outcome of the process.

International Journal of Engineering Technology Science and Research

Assessment of Parameters based on MagnetorheologicalAbrasive Flow Finishing Process.

A Magneto rheological Fluid (MRF) is a Smart fluid whose viscosity can be varied by application of magnetic field. The MR Fluid has vast applications in various engineering as well as day to day life. There is huge potential that this revolutionary material will provide many leading edge applications. The fluid has applications in various fields such as automotive industry, household applications, prosthetics, civil engineering, hydraulics, brakes and clutches, etc. Also there is a possible application of the fluid in reducing the effect of Gun Recoil. This paper will describe these applications and working of proposed application.

International Journal of Current Engineering and Technology

Magnetorheological Fluid and its Applications

The main objective of this work is to prepare MR fluid and investigating the various shape of flask and to determine the effect of various shape of tools on the surface of MS specimen and also verifying the stability of prepared MR fluid by using magneto rheological abrasive flow finishing process. So, in order to establish the process, the experimental set up is developed on which various trials have been conducted by considering the various shape of the tools and shape of flask. The magneto-rheological fluid consists of CI particles with mesh size 300, nonmagnetized Al2O3 and SiC abrasive powder with mean sizes of 67.496 and 326.04 μm respectively. Combinations of the two abrasives, Al2O3 and SiC, with CI particles were used with servo 4T oil as a carrier fluid. It was observed that the removal rate increases with increased percentage of polishing abrasives. The relative increase depends upon the amount and type of abrasives used. Hence the improvement in surface roughness is considered as an outcome of the process.