Dr. Isha T. B. currently serves as Professor at the department of Electrical and Electronics Engineering, School of Engineering, Coimbatore Campus. Her areas of research include Electrical Machine Drives, Signal Processing, Power Electronics and Alternate Energy System.


Publication Type: Journal Article
Year of Publication Publication Type Title
2015 Journal Article J. Anand, Balakrishnan, P., and Isha, T. B., “Simulation of torque ripple minimization in switched reluctance motor”, International Journal of Applied Engineering Research, vol. 10, pp. 3548-3553, 2015.[Abstract]

Though rugged and simple construction makes Switched reluctance motor (SRM) a potential candidate for many industrial applications, the presence of higher torque ripple is poses a limitation to its wide spread use. This paper presents a torque ripple reduction method by using a hysteresis torque and current controller. The reference torque is derived from a speed controller and the reference current is derived from the torque controller. Since the torque is proportional to the square of the current, a substantial reduction of torque ripple is seen when the current is controlled. Simulation is done in MATLAB/Simulink platform with each controller separately and finally all the three controllers put together. © Research India Publications.

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2015 Journal Article A. S. Pillai and Isha, T. B., “Laboratory Resource Management System with Intelligent Power-Aware Strategies-A Software Approach”, Journal of Circuits, Systems and Computers, World Scientific Publishers, vol. 24, 2015.[Abstract]

Fast growing technologies have made pervasive computing elements part of our routine life. These computing elements dissipate a lot of energy, and power optimization is one of the critical design aspects of such systems. In this work an intelligent laboratory automation and resource management system (iLARMS) is proposed, which incorporates power-aware strategies activated in software with hardware support. In the current work, investigations are carried out to observe the energy issues of the application and the processors used. Various software techniques for energy saving are incorporated in the application level and in the processor core level. The hardware implementation of the proposed resource management system is carried out using PIC16F877A and ARM7 LPC2148 microcontrollers and Intel Core 2 Duo processors. An average energy saving of the order of 48.78% was achieved with iLARMS when compared to a conventional resource management system. © 2015 World Scientific Publishing Company. More »»
2014 Journal Article A. S. Pillai and Isha, T. B., “Dynamic frequency scaling based energy consumption reduction for power-aware embedded systems - a simulation and experimental approach”, International Journal of Electrical Systems, vol. 10, pp. 36-47, 2014.[Abstract]

Energy conservation is a critical issue in battery operated systems. Energy consumption reduction of portable embedded systems is essential for increasing the battery life, enabling better system usefulness. One of the promising techniques of energy consumption reduction is Dynamic Voltage and Frequency (DVFS). In this paper, a Dynamic Frequency Scaling (DFS) method is used to reduce the energy consumed by an Atmel ATmega 16 microcontroller while executing a robotic application. A noticeable amount of energy saving was observed both by simulation and experimental validation when switching frequency was varied from rated frequency to below rated frequencies, without violating any of the temporal requirements. More »»
Publication Type: Conference Proceedings
Year of Publication Publication Type Title
2014 Conference Proceedings A. S. Pillai and Isha, T. B., “Optimal task allocation and scheduling for power saving in multiprocessor systems”, 2014 Power and Energy Systems Conference: Towards Sustainable Energy, PESTSE 2014. IEEE Computer Society, Bangalore, 2014.[Abstract]

The wide spread use of multiprocessor system demands for energy saving. Energy issues being the most critical one need prime attention and prevention. This paper presents methods for power consumption reduction in multiprocessor systems by optimally allocating the jobs and scheduling them. The job allocation in multiprocessor systems is very crucial and a novel allocation algorithm for reducing the number of processors is proposed in this work. Scheduling decisions are vital for the system to meet both temporal and functional requirements and is perfect when methods for energy consumption reduction are incorporated into it. The current work aims to reduce power consumption of an embedded processor by Dynamic Voltage Frequency Scaling (DVFS) technique. The simulation results show a considerable amount of reduction in processor utilization and power consumption. © 2014 IEEE.

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2012 Conference Proceedings A. S. Pillai and Isha, T. B., “A new real time simulator for task scheduling”, 2012 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2012. Coimbatore, Tamilnadu, 2012.[Abstract]

There are many new and existing scheduling policies within the field of real time scheduling theory. But, only a few of them are useful for real time implementation. The main difficulty is in reforming the Real Time Operating System (RTOS) to integrate the scheduling policy, which needs a skilled programming. Due to this hinderance, it is difficult to test and evaluate different policies and compare their performances. So a simulation study becomes inevitable. The available simulators mainly refer to only certain class of scheduling problem with particular execution sequence. This paper presents a software simulator which can be used to measure the performance of existing and new scheduling algorithms. The simulator is also integrated with different feasibility analysis and calculation of different scheduling aspects. © 2012 IEEE.

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Publication Type: Conference Paper
Year of Publication Publication Type Title
2008 Conference Paper P. N. Kumar and Isha, T. B., “Inductance calculation of 8/6 switched reluctance motor”, in 2008 Joint International Conference on Power System Technology POWERCON and IEEE Power India Conference, POWERCON 2008, New Delhi, 2008.[Abstract]

This paper describes a method to obtain the magnetic characteristics of an 8/6 switched reluctance machine (SRM). Finite element method (FEM) using ANSYS 10.0 software is used for the purpose. Machine model is created by PRO ENGINEER software for the ANSYS environment. To model the machine using FEM, the geometry and mechanicalparameters of the machine are established. Then the model is developed to obtain the flux linkage, current and rotor position relationship, and inductance is computed. Further, this inductance was verified experimentally and found in agreement with each other. © 2008 IEEE. More »»
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