i-manager's Journal on Mechanical Engineering (JME)


Volume 12 Issue 1 November - January 2022

Research Paper

Experimental Investigation and Mitigation of Chatter in Milling Machine using Magnetorheological Fluid

N. Nithya* , D. Sony Priyanka**, R. Kaviraj***, M. Prasanna Perumal****, M. Jagadheesh*****, S. Naveen Kumar******
*-****** Department of Mechanical Engineering, SRM Valliammai Engineering College, Kattankulathur, Tamil Nadu, India.
Nithya, N., Priyanka, D. S., Kaviraj, R., Perumal, M. P., Jagadheesh, M., and Kumar, S. N. (2022). Experimental Investigation and Mitigation of Chatter in Milling Machine using Magnetorheological Fluid. i-manager’s Journal on Mechanical Engineering, 12(1), 1-5. https://doi.org/10.26634/jme.12.1.18114

Abstract

The major problem in all machining operations is chatter which constitutes excessive vibration between tool and the workpiece. Due to the generation of chatter, tool life, reliability and safety of machining operation will be shortening. Mechanical smart structures automatically can acknowledge to external loading such as fatigue loads, seismic loads and shock loads. The application of smart fluid such as Magnetorheological fluid has been the interface between electronic controls and mechanical system, which provides controllable damping force. One of the important characteristic of MR fluid is the ability to change from viscous liquid to semi-solids in milliseconds when exposed to a magnetic field. Experimental investigation has been carried out with different cutting speed, feed rate and depth of cut and varying input current ranges from 0 to 24 Volts. The input voltage modifies the magnetic field inside the coil of the damper where chatter mark in the workpiece has been suppressed. The main objective of this work is to recommend MR damper to suppress vibration and improve surface roughness. The optimum conditions to accomplish better damping effect for the mitigation of chatter has been identified and 50% of the chatter will be suppressed. The dynamic response of end milling cutter has been studied with and without the application of MR damper, and roughness parameters have also been estimated.

Research Paper

Optimization of Pintle Injector Position to Control Thrust Propulsion

Phanibhaskar Anusuri* , Akella Yeswanth**, Raghuveer Nemani***
*-*** Department of Mechanical Engineering, Pragati Engineering College, Surampalem, India.
Anusuri, P., Yeswanth, A., and Nemani, R. (2022). Optimization of Pintle Injector Position to Control Thrust Propulsion. i-manager’s Journal on Mechanical Engineering, 12(1), 6-12. https://doi.org/10.26634/jme.12.1.18267

Abstract

Pintle nozzle plays a pivotal role in the field of aerospace industry because of the feature of controlling thrust propulsion and steering. The peculiar nozzle design of the pintle injector helps in proper mixing of propellants and also forces fluids into the combustion chamber. The position of pintle in rocketry nozzle also contributes in improving efficiency. This paper is concerned to perform CFD analysis to optimize shape of the pintle head and also by varying different positions of the pointer or pintle. In the later stage the results are tabulated for two different speeds of flow namely Minimum and Maximum. The graphs were plotted for Static Pressure, Velocity Magnitude, Turbulent Kinetic Energy, Cell Reynolds number and Strain Rate and best model is assessed. The total study and simulation was performed using ANSYS Fluent 14.5.

Research Paper

Effect of Sliding Speed on Tribological Behaviour of Heat Treated Hypoeutectic Al-7Si Alloy and Hybrid Metal Matrix Composites

Viswanatha B. M.* , Prasanna Kumar M.**, Basavarajappa S.***, Kiran T. S.****
*,**** Department of Mechanical Engineering, Kalpataru Institute of Technology, Tiptur, Karnataka, India.
** Department of Studies, University BDT College of Engineering, Davanagere, Karnataka, India.
*** IIT-Dharwad, Karnataka, India.
Viswanatha, B. M., Kumar, M. P., Basavarajappa, S., and Kiran, T. S. (2022). Effect of Sliding Speed on Tribological Behaviour of Heat Treated Hypoeutectic AL-7SI Alloy and Hybrid Metal Matrix Composites. i-manager’s Journal on Mechanical Engineering, 12(1), 13-20. https://doi.org/10.26634/jme.12.1.18395

Abstract

In the present paper, effect of sliding speed on wear behaviour of as-cast and heat treated hypoeutectic Al-7Si alloy and hybrid metal matrix composites have been investigated. Aluminium is used as matrix and Silicon Carbide (SiC) and graphite (Gr) particles are used as reinforcements. The proposed Aluminium Metal Matrix Composites (AMMCs) was fabricated by stir-cast method. Aluminium A356 matrix and reinforcements of SiCp was varied from 0 to 9% by weights in steps of 3%, and addition of fixed quantity of 3% by weight of Gr particles. The castings were machined as per ASTM standard and T6-heat-treatment was carried out. Specimens were aged at different durations from 3 to 12 hrs in steps of 3 hrs at a temperature of 155 ºC. The pin-on-disc wear testing machine was employed to evaluate the wear rate of the composites. As per the results, addition of reinforcement and aged at T6-9 hrs shows most wear resistance in all sliding tests. The increase in sliding speed with increase of wear rate was observed. The wear tested samples were examined using scanning electron microscope (SEM) and energy dispersive spectrum (EDS) and analysed.

Research Paper

Design of Pipe-Inspection Robot for Pipeline Systems

Ashok Rajan*
Department of Mechanical Engineering, SRM Valliammai Engineering College, Kattankulathur, Tamil Nadu, India.
Rajan, A. (2022). Design of Pipe-Inspection Robot for Pipeline Systems. i-manager’s Journal on Mechanical Engineering, 12(1), 21-25. https://doi.org/10.26634/jme.12.1.18270

Abstract

A Wheel based pipe inspection robot is designed for examining 300 mm to 400 mm diameter pipes which is mostly used in chemical and food industries. The fundamental point of this plan is to perform vertical slithering, autonomous multi elbow turning and support free and viable financial model. Planned robot consists of two significant modules, upper and lower module. Upper and lower course of action have three design wheel with straightforward scissor system for wheel extension. These two modules are associated by spring (compressive) to accomplish wheel extension and adaptable elbow turning. Full plan is done in solid works programming. Accordingly the robot configuration turns out great in vertical development and complex elbow turning.

Research Paper

Torsional Analysis of Open Thin-Walled Doubly Symmetric Beams under Torsion and Bimoment

Mohammed Ali Hjaji* , Hasan Mehdi Nagiar**, Ezedine Giuma Allaboudi***, Muftah Mohamed Krer****
*-**** Department of Mechanical Engineering, University of Tripoli, Libya.
Hjaji, M. A., Nagiar, H. M., Allaboudi, E. G., and Krer, M. M. (2022). Torsional Analysis of Open Thin-Walled Doubly Symmetric Beams under Torsion and Bimoment. i-manager’s Journal on Mechanical Engineering, 12(1), 26-38. https://doi.org/10.26634/jme.12.1.18347

Abstract

The present paper investigated the static analysis for the coupled torsional-warping response of open thin-walled doubly symmetric beams subjected to various twisting moments and bimoments. The static equilibrium torsional-warping coupling differential equations and associated boundary conditions for the thin-walled beams are derived using total potential energy variational principle. The exact closed-form solutions for the beams having a cantilever, simply-supported, fixed-fixed and fixed-fork boundary conditions and under various torsional and warping moments are determined. The present solution is shown to successfully capture the coupled torsional-warping static response of the thin-walled beams with various boundary conditions and by excluding and including axial static force effects. The validity and the accuracy of the numerical results based on the present solution are accomplished throughout the numerical examples presented and compared with well-established ABAQUS finite beam model solution and other exact solution available in the literature.

Research Paper

Dynamic Simulation and Parametric Analysis of Green Roofing in Buildings

Malik F. Elmzughi* , Zuhaira M. Alhafi**
*-** Department Mechanical and Industrial Engineering, Faculty of Engineering, University of Tripoli, Tripoli, Libya.
Elmzughi, M. F., and Alhafi, Z. M. (2022). Dynamic Simulation and Parametric Analysis of Green Roofing in Buildings. i-manager’s Journal on Mechanical Engineering, 12(1), 39-47. https://doi.org/10.26634/jme.12.1.18539

Abstract

Enhancing energy efficiency and performance of the buildings and improving the air quality are acquisition during the cooling and heating seasons. According to the 2010 report by General Electricity Company of Libya, electrical energy consumption by residential sector account for approximately 39% of total demand in Libya. The green roof technologies in buildings are one of the main methods for using energy economically and reducing COemission. The economic parameters such as the vegetation thickness and its thermal conductivity for the green roof, the electrical energy cost, coefficient of performance and EER all affect CO2 emission and total cost of the buildings. This study focuses on the impact of these parameters on the application of green roofs as well as degerming the optimum vegetation thickness and thermal conductivity of vegetation layer. Tripoli's degree days were used as one of methods to achieve these calculations or the results. The green roof and mathematical models were performed to find energy savings, and payback, and CO2 reductions. This study focuses on investigating these parameters that affect the green roof for external building based on life-cycle cost analysis (an economic model). As a result, the total cost increased from 6.7 to 23.05 $/m2; while CO2 emission decreased from 2.5 to 1.52 kg/m2/years with increasing the electricity costs which includes the effects of Interest rate on CO2 emission and total cost. Total cost decreased from 16.7 to 14.9 $/m2; while CO2 emission increased from 1.85 to 1.94 kg/m2/years with increasing the Interest. An increase in COP (Coefficient of Performance) and EER (Energy Efficiency Ratio) causes the CO2 emission to decrease from 2.2 to 1.51 kg/m2/years and from 2.08 to 1.37 kg/m2/year and total cost to decrease from 18.3 to 12.9 $/m2 and from 17.4 to 11.76 $/m2. The total cost and CO2 emission are increased from 13.7 to 16.5 $/m2 and from 0.34 to 1.74 kg/m2/years with increasing the thermal conductivity of vegetation. And the effects of degree day on CO2 emission and total cost, the total cost and CO2 emission are decreased from 18.6 to 14.67 $/m2 and from 2.45 to 1.55 kg/m2/years with increasing the degree day.