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Mulik P.B.,Rajarambapu Institute of Technology
4th IEEE Sponsored International Conference on Computation of Power, Energy, Information and Communication, ICCPEIC 2015 | Year: 2015

This paper proposes new method based on evolutionary algorithm for optimal trajectory planning of robot manipulator (PUMA 560). The intelligent method is elitist non dominated sorting based genetic algorithm (NSGA-II). This method is superior as it considers multiple criterion to be optimised simultaneously. The multicriterion cost function has to minimize with defined constraints. The problem has 5 objective functions, 32 constraints and 252 variables. Pareto optimal is set of compromise solutions instead of single optimal solution. Pareto optimal fronts are evaluated by the solution spread measure and ratio of non dominated individuals. The B-spline function is used to define robot trajectories. © 2015 IEEE. Source


Chavan D.,Rajarambapu Institute of Technology
Journal of Thermal Science and Engineering Applications | Year: 2014

Nanofluids are suspensions of metallic or nonmetallic nanopowders in base liquid and can be employed to increase heat transfer rate at various applications. In the present study, forced convective heat transfer in an Al2O3/water nanofluid has experimentally been compared to that of pure water in automobile radiator. Five different concentrations of nanofluids in the range of 0-1.0 vol. % have been prepared by the addition of Al2O3 nanoparticles into the water. The test fluid flows through the automobile radiator consisted of 33 vertical tubes with elliptical cross section and air makes a cross flow inside the tube bank with constant speed. The test fluid flow rate has been changed in the range of 3 l/min to 8 l/min to have fully turbulent regime. Obtained results demonstrate that increasing the fluid circulating rate can improve the heat transfer performance. The application of the nanofluid with low concentration can enhance heat transfer efficiency up to 40-45% in comparison with pure water. The increase in heat transfer coefficient due to presence of nanoparticles is higher than the prediction of single phase heat transfer Dittus Boelter correlation used with nanofluid properties. These results can be implemented to optimize the size of an automobile radiator. © 2014 by ASME. Source


Jalwadi S.N.,Rajarambapu Institute of Technology
International Journal of Vehicle Structures and Systems | Year: 2013

In this paper thermal-structural behaviour of an internally heated vertical low mass cantilever beam was analyzed by a mathematical model and finite element analysis. The obtained results are verified with experimental results. The analysis shows that when natural frequency of the beam is in the range of 0.788 to 1.051Hz thermally induced vibrations occur. This indicates that determining natural frequency of the beam is more important than the heating rate. Outside the range of 0.788 to 1.051 Hz, thermally induced vibrations are absent since thermal moment developed due to temperature difference is insufficient to drive the beam. © 2013. MechAero Foundation for Technical Research & Education Excellence. Source


Kakade A.B.,Rajarambapu Institute of Technology | Ghosh B.,Indian Institute of Technology Kharagpur
IET Microwaves, Antennas and Propagation | Year: 2012

A rectangular waveguide feed to the dielectric resonator antenna (DRA) is proposed. A three-layer DRA structure is used to achieve enhanced and broadband coupling to the waveguide. The antenna topology is easy to realise and does not need additional coupling or matching elements to effectively excite the DRA. The configuration also affords ease in frequency tuning without sacrificing bandwidth or radiation performance. The full-wave Green's function approach is presented for the analysis of such multilayer structures with an arbitrary number of layers with greatly reduced computational overhead. The modes of the multilayer DRA can be identified from the analysis, which can be used to explain the broadband nature of the coupling. The double-summation representation of the homogeneous Green's function has been extended to the multilayer case, leading to a substantial reduction in computation time for the input impedance. © 2012 The Institution of Engineering and Technology. Source


Kakade A.B.,Rajarambapu Institute of Technology | Ghosh B.,Indian Institute of Technology Kharagpur
IEEE Transactions on Antennas and Propagation | Year: 2011

In this paper, a coax-probe excited multilayer dielectric resonator antenna (DRA) structure is rigorously analyzed from the modal perspective. The full-wave Green's function approach is presented for the analysis of such multilayer structures with an arbitrary number of layers with greatly reduced computational overhead. Additional reduction in computation time is demonstrated for a centered probe. Also, the modes of the multilayer DRA can be identified from the analysis, which can be used to explain the broadband nature of the coupling. The layer permittivities are optimized for broadband operation of the coax-fed DRA. The bandwidth enhancement for a centered and offset probe is seen to be due to a combination of several DRA modes and the probe resonance. Frequency tuning of the antenna structure is also demonstrated by exciting the antenna at a higher order mode, maintaining the broadband characteristics. The radiation characteristics of the antenna are also investigated. © 2011 IEEE. Source

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