Statistical Evaluation of Restriking Voltage Characteristics Using Monte Carlo Simulation

--Atul Koshti, L D Arya, Rajesh Ahirwar and Manoj Gupta

In this paper, a low-noise amplifier operated at 2.41 GHz is designed as it performs a significant role in the field of microwave communication technology. This amplifier is then integrated with a microstrip patch antenna which acts as the output stage of a receiver where the signals need to strengthen before reception.

© 2013 IUP. All Rights Reserved.

Simulation and Analysis of MEMS Cantilever Sensor for Tuberculosis Detection Based on Capacitive Sensing Readout Method

--P Sangeetha and A Vimala Juliet

The paper presents a rotor position estimation technique for a 6/4 switched reluctance machine based on Adaptive Neuro fuzzy Inference System (ANFIS). This technique is applied for modeling the nonlinear rotor position of SRM using the magnetization characteristics of the machine. ANFIS has a strong nonlinear approximation ability which could be used for nonlinear modeling of the machine and its real time implementations. In this paper, the best features of ANFIS are utilized to develop the computationally efficient rotor position model q (I, L) for SRM. Mathematical model for q (I, L) using ANFIS has been successfully arrived, tested and presented for various values of phase currents (Iph) and phase flux inductance (L) of a nonlinear SRM. It is observed that ANFIS is highly suitable for rotor position q (I, L) modeling of SRM, which is found to be in good agreement with the training and checking data used for modeling.

© 2013 IUP. All Rights Reserved.

Cuckoo Search Algorithm: Basic Concepts, Variants and Applications – A Review

-- Mridul Chawla and Manoj Duhan

The paper proposes application of Bat algorithm for solving economic load dispatch problem. Bat algorithm is based on the echolocation characteristics of micro bats. The proposed approach was examined and tested with the numerical results of Economic load Dispatch (ED) problems with three and five generating units with valve-point loading without considering prohibited operating zones and ramp rate limits. The results of the proposed Bat algorithm are compared with that of the other techniques such as lambda iteration, GA, PSO, APSO and ABC. For both the cases, the proposed algorithm outperforms the solution reported for the existing algorithms. In addition, the promising results show the robustness, fast convergence and efficiency of the proposed technique.

© 2013 IUP. All Rights Reserved.

Printed Dipole Antennas with Shaped Ground Plane Used to Enhance Impedance Bandwidth

--R P Ghosh, K Patra, B Gupta, P P Sarkar and S K Chowdhury

The paper compares the performance of microstrip BPF and coplanar waveguide band pass filter. The CPW and microstrip filters are designed at the same frequency of 2.4 GHz. The proposed filters comprise two symmetrical hairpin resonators and open stub. The upper and lower resonant frequencies of band pass filters are generated by hairpin resonators and open stub respectively. To avoid slot mode radiation air-bridges are used in the geometry of CPW waveguide. The optimizations of band pass filters are done with ads 2009 software. A comparison of designs and simulated results is made with a discussion on each filter. The simulated results show that the microstrip filter offers low insertion loss and reflection loss in comparison to CPW filter.

© 2013 IUP. All Rights Reserved.

Identification of Faulted Distributed Line in an Ungrounded System

--M Upender Reddy, M Surender Reddy and Vasam Suresh

Reliability of a unit (or product) is the probability that the unit performs its intended function adequately for a given period of time under the stated operating conditions or environment. The objective of a particular system or mission will determine its reliability requirements. Maintainability can be defined as the probability that failed equipment is restored to operable condition in a specified time when the maintenance is performed under stated conditions. It characterizes the adaptability of the equipment to the detection and elimination of failures as well as their prevention (Balagurusamy, 2002).

Reliability to a consumer means that power is made available to him is fault-free and the outage or interruptions are tolerable and do not disturb his normal life. System reliability is not the same as power quality. System reliability pertains to sustained interruptions and momentary interruptions. Power quality involves voltage fluctuations, abnormal waveforms and harmonic distortions. An interruption of greater than 5 min is generally considered a reliability issue and interruptions of less than 5 min are a power quality concern (IEEE Std 1366, 2003).

To measure system performance, the electric utility industry has developed several performance measures of reliability. These reliability indices include measures of outage duration, frequency outages, system availability and response time (Robert and David, 1999). Customer satisfaction can be improved through providing better quality power in terms of voltage and frequency fluctuations, and reliability by reducing outages.

© 2013 IUP. All Rights Reserved.