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

School of Mechanical Engineering

The heat transfer co-efficient (HTC) was measured in nanofluids made from ethylene glycol water mixture dispersed with different amounts of graphite nanoparticles (GRNP) at different flow rates (Reynolds number Re = 50 to 800) and temperatures range between 10 to 85 °C. It was observed that the HTC was highly dependent on the Re with two regimes. HTC was found to follow the power law of the type (HTC) = A (Re)χ where the exponent χ was dependent on Re range, composition and temperature. In the high Re regime, the exponent was of the order of 0.5 while at low Re regime (Re < 150) the χ value was 0.85 to 0.92. The HTC at low Re values could be correlated with the thermal conduction process and Brownian motion, while at high Re, random motion could be prevailing. The results have been compared with the reported data for carbon nanotubes (CNT) for which also the exponent was much more than 0.333 which is indicated in the standard Sieder-Tate equation. Thus, the overall variation of HTC with Re appears to be HTC= A Reχ where χ assumes values depending on the regimes of Re viz. low, intermediate and high Re with χ ≈ 0.92, 0.3 < χ <0.5 and χ ≥ 0.85 respectively.

School of Polymer Engineering

Engineering and Technology

World University root node

Journal of Nanofluids (USA)

Power Law Variation of Heat Transfer Coefficient with Reynolds Number in Nanofluids Containing Graphite and Carbon Nanotubes Nanoparticles

In the present investigation response surface methodology (RSM) is used to fit the quadratic model for surface roughness and microhardness of roller burnishing process on Aluminum alloy 63400 Grade. The desirability function technique is utilized to optimize the responses. Central composite design (CCD) technique is used to prepare the experiment matrix. Single roller carbide burnishing tool is employed for preparing experiment samples. The individual and interaction of effect each controllable parameter is analyzed using analysis of variance (ANOVA) and quadratic regression analysis is performed to compute the correlation coefﬁcient. It is observed that for surface roughness, feed and for microhardness, force and number of tool passes is the most significant parameter. To find the optimum value for both the responses, desirability function approach is used.

Fulltext

Science Direct Procedia Manufacturing

Modeling and Optimization of surface roughness and microhardness for roller burnishing process using response surface methodology for Aluminum 63400 alloy

New developments in material science have developed high-strength temperature-resistant materials (HSTR)with many extraordinary abilities. Now a days these advanced and smart materials such as Nickel-basedsuper alloys, stainless steel and tool steel are the demands of automotive, aerospace, electronics, medicaldevices and communication industries for production of more durable and reliable products. Machining ofthese materials is a challenge and traditional manufacturing techniques are often found unfit for the purpose.Electrochemical machining (ECM) provides the alternative to traditional or conventional machiningprocesses without a direct contact between the tool and the workpiece, with high material removal rates,irrespective of diverse mechanical properties of the workpiece. Even though ECM has a great potential, theprocess is still not fully explored and its research is in process. ECM process involves number of phenomenasuch as electrochemistry, mass transfer, heat transfer and hydrodynamics taking place simultaneously andleads to different material removal rate at each point on the anode surface (Workpiece). Due to this it is verydifficult to predict the anode profile accurately in ECM process. For better understanding of the ECM processto improve the performance the basic electrochemistry involved is reviewed and presented in this paper.

Journal of Advanced Research in Dynamical and Control Systems

Electro Chemistry in Electrochemical Machining Process

A high precision or surgeon skills are required in some of the precision procedures such as micro-scale minimally invasive surgeries. Robotic manipulators are being explored for carrying out surgeries with minimal invasion, outstanding precision and stability of the tool. Major challenges in developing such systems are motion of the tool with 'mechanical' remote center and preserving surgical feel of the surgeon. This paper presents conceptual design of 2-DOF isosceles trapezoidal remote center motion mechanism. The proposed concepts use mechanically generated RCM. The compact and handy design helps to preserve the 'surgical feel'. The use of compliant links over rigid link mechanism brings the precision in manipulation. Extensive, nonlinear FE analysis demonstrates the accuracy of the RCM. Further the actuation method, sensor scheme and control scheme are presented as an example case. © 2018 IEEE.

2018 3rd International Conference for Convergence in Technology, I2CT 2018

Compliant Remote Center Motion Mechanism for Minimally Invasive Surgical Robots

This manuscript consists of performance and studies on mixed type solar food dehydrator. This paper presents the design, construction and performance of a mixed-mode solar dryer for food preservation. The design was prepared on CATIA V5 and simulation is done on ANSYS FLUENT to know actual working of solar food dehydrator. In this dryer heated air from collector is passed over the drying chamber to dehumidify the crops. Experiments were conducted on solar dehydrator to obtain the best results. Moreover some improvements have been done to obtain more temperature. The food selected for drying is green chillies which were conducted for 8 hours in a day. The design of solar food dryer is made on consideration of its mobility. Mobility enhances the drying temperature and reduces the drying time of solar food dehydrator as it can be shifted according to direction of sun. Temperature achieved was in between 50- 55 {\textordmasculine}C. The dryer exhibited sufficient ability to dry food items reasonably rapidly to a safe moisture level and simultaneously it ensures a superior quality of the dried product. Keywords:

Proceedings of 3rdNational Conference on Recent Trends in Mechanical Engineering (NCRTME - 2018)

Design, analysis and studies on performance of the solar food dehydrator

The purpose of this paper is to investigate stress distribution pattern around implant-bone interface of commercially available different thread profile dental implants using finite element analysis and experimental verification by photo elastic stress analysis. A two-dimensional Finite Element Model of implant prosthesis (Implant, abutment, screw, &amp; human bone) is modeled using commercial software code. Occlusal load on teeth is applied as static load on the abutment to find the shear stress around implant-bone interface. Photo elastic model is prepared using acrylic material, having homogenous mixture of Araldite Resin CY 230 and hardener HY 951. Screwing and drilling of implant in the photo elastic model is done by dentist in the lab. Tardy’s method is used for noting the fringe order at a particular point to predict the stress intensity in the acrylic model. Scaling method is used to predict the shear stress in the cancellous bone from the measured stress intensity of photo elastic model. The current research work reveals stress distribution pattern with different implant systems. The highest value of stress is observed in the model fitted with reverse buttress thread profile at apical portion of implant while least value was observed for implant fitted with V thread profile at critical section, and is found to be the best profile amongst the other two from maximum shear stress criteria.

Materials Today: Proceedings

Finite element analysis and experimental investigations on stress distribution of dental implants around implant-bone interface

Bending fatigue is one of the failure modes of spur gear tooth. Crack initiates at the root of a tooth on the active side. Crack due to bending fatigue results in tooth breakage. It may cause a sudden or catastrophic failure of spur gears. A major concern for design engineers is to prevent this type of failure, because it will cause accidents, casualties and financial losses. Many researchers have done excellent work on crack propagation in gears due to bending fatigue. Different crack growth models, based on the linear elastic fracture mechanics (LEFM), are used for crack propagation analysis and prediction of the service life of gears. The study in this paper includes the factorial design approach used for gear tooth bending fatigue crack propagation for specific gear configurations. Experiments are performed on the gears with optimized parameters for three different materials. Crack propagation life is estimated for these gears materials. Finite element (with Mechanical APDL 17.0) analysis for crack propagation is also done on optimized gear with SAE8620 materials.

International Review of Mechanical Engineering

Experimental and Analytical Analysis of Crack Propagation on Spur Gear Due to Bending Fatigue and Service Life Estimation

In the present study, a novel method of active vibration control of machines subject to base excitation using air spring is proposed. The study also includes proposes of a feedback control system, for active vibration control with mass flow rate as a function of the velocity of the mass, and/or base of air spring. Earlier study shows application of air spring as a force actuator. The mass flow introduces additional input excitation into the system by means of which the stiffness or resultant excitation force on the mass can be changed. A mathematical model is developed and response to steady state and transient base input are obtained. The use of appropriate value of gain in the system can ensure that the amplitude of response to excitation from the base is lower than the amplitude of base excitation. Some suitable values of gain depending on the special cases considered are suggested. An active control system with mass flow rate as a function of base velocity and gain equal to − 1 is most effective in controlling the vibration. This is highly desirable in case of high precision equipment. The interesting observation is that the spring rate can be changed and even made negative.

Journal of The Institution of Engineers (India) Series C

Active Vibration Control using Air Spring

Wire Electrical Discharge Machining (WEDM) is used as a valuable machining tool in the world of non-traditional machining due to various features which includes higher degree of accuracy, fine surface quality and good productivity. WEDM consists of large number of process parameters, thus it is difficult to obtain a combination of optimum parameters which provides higher accuracy. Optimization of a single response is often carried out with the well known technique Taguchi method. This method results in the solution which gives optimum value of each response. The experimentation has been completed with the help of Taguchi’s L25 Orthogonal Array. Grey Wolf Optimizer (GWO) algorithm is inspired by grey wolves. The Grey Wolf Optimizer algorithm mimics the leadership hierarchy and hunting mechanism of grey wolves in nature. In this paper, an attempt is made to study the effect of various process parameters such as pulse on time, pulse off time, wire feed, wire tension, upper flush and lower flush for high carbon high chromium steel and GWO is used to optimize the thinning in automotive sealing cover. ICMPC 2017