Rajasthan Technical University

About: Rajasthan Technical University is a education organization based out in Kota, Rajasthan, India. It is known for research contribution in the topics: Photovoltaic system & PID controller. The organization has 716 authors who have published 1084 publications receiving 4530 citations. The organization is also known as: RTU.

Multi-objective three level parallel PSO algorithm for structural alignment of complex RNA sequences

Abstract: This paper introduces a caching enabled parallel multi-objective tri-level particle swarm optimization algorithm (MO-3LPPSO) with objective to address a challenging NP-hard problem from bioinformatics i.e. structural alignment of complex RNA sequences. MO-3LPPSO implements master-slave topology based communication strategy on the parallely connected machines via message passing interface (MPI). Level 1 of the proposed algorithm acquires the optimal alignment of the sequences distributed on slave processors in the order of their complexities. Further, the aligned sequences along with their alignment scores are stored on the master processor. In the second level, the secondary structures of all the gbest aligned sequences of level 1 is obtained. Each sequence set is distributed on a slave processors, that constructs secondary structure of all sequences from the set. The alignment scores and secondary structure scores obtained from level 1 and level 2, now move towards level 3, forming a bi-objective optimization problem with the objectives to maximize sequence similarity score and minimize free energy score for most stable RNA secondary structure. The top-level non-dominated solutions are extracted further in level three and the external archive in Ctrie is updated. The improvement from MO-TLPSO to MO-3LPPSO has been remarkable in the sense: inclusion of Ctrie enables the algorithm to work with multi-client environment for handling RNA structural alignment queries; implementation of parallelization facilitates structural alignment of highly complex massive datasets of RNA sequences. Further, the difference between the time taken by MO-TLPSO and MO-3LPPSO is found extremely significant, as confirmed by non-parametric statistical test Mann-Whitney U test. Further, the structural alignment of highly complex sequence sets is performed by MO-3LPPSO, which is tested for prediction accuracy and processing time. The algorithm is found producing highly accurate results at significantly lesser processing time.

An LMI approach for robust LQR control of PWM buck converter with parasitics

Abstract: In this paper, a polytopic model of an uncertain buck converter with parasitic resistances is obtained in continuous conduction mode. Although linear quadratic regulators (LQRs) provide good stability and are optimal but they do not ensure robustness for the highly uncertain system. Therefore, A robust LQR designing method for power converters is presented using linear matrix inequalities (LMIs) to ensure robust stability of highly uncertain systems and the output is analyzed in the presence of line and load perturbations. In addition, an input voltage feedforward gain is included in this closed loop converter system to achieve a good line regulation. It is shown that with feedforward, there is no transient due to the line voltage perturbations. The results of the proposed approach are verified through simulation.

Net power generated by flettner rotor for different values of wind speed and ship speed

Abstract: In global scenario, shipping and inland water transport became a very popular and necessary mode of goods transport, as it covers approximately 90% of the tonnage of all traded goods. That contributes approximately 2.8% to 3% of annual global greenhouse gas emissions, especially CO 2 . The marine transportation is expected to increase further more as energy demand is expected to grow by 25% from 2014 to 2040. Environmental concerns for the reduction of CO 2 emission compel the shipping industry to reduce fossil fuel consumptions by increasing efficiency in shipping transportation and by adopting renewable energy sources for shipping. Wind energy for ship transportation is abundant and its potential is also high on seas. Wing sails, Airborne wind turbines, Wind kites, Flettner rotors, etc. are different techniques to harness wind energy for shipping. Flettner Rotor technique is one which provide thrust force for propelling the ship. In this paper, a cylindrical Flettner rotor (without endplates) of 12.5 m height and 2.1 m diameter is used for the theoretical analysis to estimate net power generation by Flettner rotor using the values of lift coefficient of C l = 12.5 and drag coefficient of C d = 0.2. Calculations have been made for ship speeds of 15 knots and 20 knots and wind speed variation from 5 m/s to 20 m/s at all true wind angles. Net power output obtained is maximum at true wind angles of 100 degree and 260 degree. At ship speed of 15 knots, the maximum values of net power obtained is 42.2 kW, 124 kW, 239.9 kW and 386.7 kW at wind speeds of 5 m/s, 10 m/s, 15 m/s, 20 m/s respectively. Whereas, at ship speed of 20 knots maximum values of net power is 68.2 kW, 189.5 kW, 358.8 kW and 575.2 kW at wind speeds of 5 m/s, 10 m/s, 15 m/s, 20 m/s respectively. Calculations have also been made for net power generation from Flettner rotor for various values of coefficient of rotation.

Free Vibration Analysis of FGM Structures Using FEM Technique

Abstract: This article deals with the free vibration analysis of FGM structures. In this study, three structures are being used such as a skewed, triangular and trapezoidal plates. The mechanical constants are continuously graded across the thickness direction. Material constants are varied as per power law gradation (P-FGM). The natural frequencies and their respective mode shapes are obtained for FGM structures. Finite element software COMSOL multiphysics is used to obtained natural frequencies and their respective mode shapes. Results for different boundary conditions are also reported. Boundary conditions such as clamped, simply supported and the combination of clamped and simply supported are used. The effects of the functionally graded index and width-to-thickness ratio on natural frequencies are also presented. It is observed that results obtained by finite element software COMSOL multiphysics–5.4 are at the same level of accuracy than those of previously published results using analytical methods. The objective of this paper is to vibration analysis of different shapes of FGM structures. So, this paper is useful in the design of FGM structure for engineering applications.

Enhancing DBSCAN algorithm for data mining

Abstract: Today data mining is widely used by companies with a strong consumer focus like retail, financial, communication and marketing organizations. Here technically data mining is the process of extraction of required information from huge databases. It allows users to analyze data from many different dimensions or angles, categorize it and summarize the relationships identified. The ultimate goal of this paper is to propose a methodology for the improvement in DB-SCAN algorithm to improve clustering accuracy. The proposed improvement is based on back propagation algorithm to calculate Euclidean distance in the dynamic manner. Also this paper shows the obtained results of implemented proposed and existing methods and it compares the results in terms of its execution time and accuracy.