Department of Electrical Engineering

Indian Institute of Technology Palakkad&nbsp;(IIT Palakkad or IIT PKD) is a public autonomous&nbsp;engineering&nbsp;and&nbsp;research&nbsp;institute located in&nbsp;Palakkad,&nbsp;Kerala. It was&nbsp;one of the five new&nbsp;IITs&nbsp;proposed in the&nbsp;2014 Union budget of India. The campus was inaugurated on 3 August 2015. The institute has 94 faculty, 978 students, and 63 non-teaching staffs.

IT Palakkad currently offers four-year Bachelor of Technology (B.Tech) and two years MS programmes in 8 different engineering disciplines including&nbsp;Computer Science, Electrical, Mechanical, Civil among others.

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IIT Palakkad

As semiconductor devices scale to new dimensions, the materials and designs become more dependent on atomic details. NEMO5 is a nanoelectronics modeling package designed for comprehending the critical multi-scale, multi-physics phenomena through efficient computational approaches and quantitatively modeling new generations of nanoelectronic devices as well as predicting novel device architectures and phenomena. This article seeks to provide updates on the current status of the tool and new functionality, including advances in quantum transport simulations and with materials such as metals, topological insulators, and piezoelectrics. © 2013 Springer Science+Business Media New York.

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Journal of Computational Electronics

Efficient and realistic device modeling from atomic detail to the nanoscale

The paper presents an intelligent relaying scheme for transmission line in presence of UPFC. Transmission line distance relaying in presence of FACTs devices like UPFC has been a very challenging task. A new differential feature based approach using DFT based pre-processor and Decision tree (DT) is presented here for protection of transmission lines containing UPFC. A case study considering a 500-kV Transmission line of length 400-k.m(both single circuit and double circuit) is taken for simulation purpose in MATLAB environment and the results obtained show feasibility of the proposed relaying scheme. © 2013 IEEE.

Proceedings - 2013 1st International Conference on Emerging Trends and Applications in Computer Science, ICETACS 2013

Intelligent relaying of UPFC based transmission lines using decision tree

In orthogonal frequency division multiplexing systems, such as Long Term Evolution (LTE) and WiMAX, the different subcarriers over which a codeword is transmitted may see different signal-to-noise-ratios (SNRs). Thus, adaptive modulation and coding (AMC) in these systems must be based on a vector of subcarrier SNRs seen by the codeword, and is considerably more involved. Exponential effective SNR mapping (EESM) simplifies the problem by mapping the vector of SNRs into a single equivalent flat-fading SNR. However, the analysis of AMC using EESM is challenging owing to its non-linear nature and because it uses an SNR scaling parameter that depends on the modulation and coding scheme. We first propose a novel statistical model for EESM based on the Beta distribution, which is motivated by the central limit approximation for the sum of random variables with finite support. Unlike several ad hoc statistical models, which require three or more parameters to be computed numerically, the proposed model requires only two parameters, for which closed-form expressions are derived for both correlated and uncorrelated subcarrier SNRs. Despite its simplicity, it is as accurate as the ad hoc models. We then present a novel, tight upper bound and an accurate approximation in closed-form for the throughput of a frequency-selective system that uses EESM for AMC. © 2013 IEEE.

GLOBECOM - IEEE Global Telecommunications Conference

EESM-based link adaptation in OFDM: Modeling and analysis

Voltage source inverters are an integral part of renewable power sources and smart grid systems. Computationally efficient and fairly accurate models for the voltage source inverter are required to carry out extensive simulation studies on complex power networks. Accuracy requires that the effect of dead-time be incorporated in the inverter model. The dead-time is essentially a short delay introduced between the gating pulses to the complementary switches in an inverter leg for the safety of power devices. As the modern voltage source inverters switch at fairly high frequencies, the dead-time significantly influences the output fundamental voltage. Dead-time also causes low-frequency harmonic distortion and is hence important from a power quality perspective. This paper studies the dead-time effect in a synchronous dq reference frame, since dynamic studies and controller design are typically carried out in this frame of reference. For the sake of computational efficiency, average models are derived, incorporating the dead-time effect, in both RYB and dq reference frames. The average models are shown to consume less computation time than their corresponding switching models, the accuracies of the models being comparable. The proposed average synchronous reference frame model, including effect of dead-time, is validated through experimental results. © 2013 IEEE.

2013 IEEE Innovative Smart Grid Technologies - Asia, ISGT Asia 2013

Average modelling of a voltage source inverter with dead-time in a synchronous reference frame

In this paper, we present local equilibrium configuration controllability analysis of a spherical robot. The robot is actuated by the principle of displacing the center of gravity of the system using an internal mechanism. The system is defined on a trivial principal fiber bundle, characterized by base body motion and the shape dynamics, and the equations of motion are in the form of the nonholonomic Euler-Poincaré equation with advected dynamics. Using Lie brackets and symmetric products of the potential and control vector fields, local configuration accessibility and local (fiber) equilibrium controllability are presented. © 2013 IEEE.

Proceedings of the IEEE Conference on Decision and Control

Local equilibrium controllability of a spherical robot actuated by a pendulum

The objective of this work is to find cumulative fatigue damage of the truck cabin caused by proving ground data. Stresses in the cabin are derived by finite element analysis using inertia relief method. Multi body simulation software ADAMS was used to obtain the load history at cabin attachment points using measured proving ground data as input. The fatigue damage of the truck cabin was estimated by linear super position method with static results and load history. The calculated numerical fatigue damage results were compared with physical test results and correlated. © 2013 SAE International.

SAE Technical Papers

Virtual durability analysis of heavy commercial truck cabin for proving ground inputs

Evaluation of vehicle structural durability is one of the key requirements in design and development of today's automobiles. Computer simulations are used to estimate vehicle durability to save the cost and time required for building and testing the prototype vehicles. The objective of this work was to find the service life of automotive structures like passenger commercial vehicle (bus) and truck's cabin by calculating cumulative fatigue life for operation under actual road conditions. Stresses in the bus and cabin are derived by means of performing finite element analysis using inertia relief method. Multi body dynamics simulation software ADAMS was used to obtain the load history at the bus and cabin mount locations-using measured load data as input. Strain based fatigue life analysis was carried out in MSC-Fatigue using static stresses from Nastran and extracted force histories from ADAMS. The estimated fatigue life was compared with the physical test results. Copyright © 2013 SAE International and Copyright © 2013 SIAT, India.

Structural fatigue strength evaluation of commercial vehicle structures by calculating damage due to road load inputs

Design and development of a metal contact switch that employs micro electromechanical systems (MEMS) based on electrostatic actuation and implemented using a coplanar waveguide (CPW) with three switch cells is presented. The design is based on the series-shunt switch configuration. The main objective of the present design is to achieve high isolation up to 12GHz frequency (X-band). The dimensions of the MEMS switch have been optimized with finite element method based Coventor Ware software. The switch has been fabricated using gold based surface micromachining process. The mechanical response, electrical response, switching time, loss performance and Intermodulation distortions of the MEMS switch have been experimentally investigated. Return loss better than 15dB and isolation greater than 60dB have been experimentally obtained upto 12GHz from the fabricated switch. © 2013 IEEE.

2013 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems, COMCAS 2013

Fabrication and characterization of RF MEMS high isolation switch upto X-band

The design, development and characterization of single-pole-double-through (SPDT) switch using micro electromechanical systems based inline-metal contact switch is presented in this paper. The switch employs electrostatic actuation and is implemented using coplanar waveguide. The design is based on the series-shunt configuration consisting of six cantilever type switches. The main objective of the present study is to achieve high-isolation, good input/output match, low insertion loss and small size to fit into Ku-band transmit/receive module. The device has been fabricated using gold based surface micromachining process. The mechanical, electrical, transient, intermodulation distortion and loss performance of MEMS switch have been experimentally investigated and validated. Measured return loss of better than 22dB with worst case insertion loss of 1.4 dB and isolation greater than 45dB have been experimentally achieved from SPDT switch over 13-17 GHz. The total switch area is 1.25 mm2. The performance of the switch is finally compared with the present state-of-the-art. © 2013 IEEE.

2013 IEEE MTT-S International Microwave and RF Conference, IMaRC 2013

Design and development of miniaturized high isolation MEMS SPDT switch for Ku-band T/R module application

This paper deals with a continuous-time state-dependent jump linear system. In particular, we consider a situation when the transition rate of the random jump process depends on the state variable, and addressed the problem of stochastic stability analysis and control synthesis for the proposed system. Numerically solvable sufficient conditions for the stochastic stability of the proposed system are established in terms of linear matrix inequalities. The state feedback controller is accordingly developed. The obtained results are illustrated in numerical examples. © 2013 IEEE.