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EED-Newsletter-Vol-2-Issue-1-2017

PAGE 20

PAGE 20 EED PhD Graduate Students Thesis Title: Efficient Electromagnetic Analysis & Design Techniques in JET Engines APARNA KRISHNA Aparna Krishna is a PhD scholar (GPA:3.76/4.0) in Electrical Engineering at Qatar University. Aparna obtained her Masters in Communication Systems at Anna University, Chennai, India and Bachelor in Electronics and Communication Engineering at Calicut University, India. She worked as an R.A at Qatar University and as a lecturer at S.B College of Engineering, Kerala, India. Her current research focuses on the analysis of electromagnetic propagation inside harsh metallic environment. She is working under the guidance of Dr. Tamer Khattab, Associate Professor, Qatar University. The thesis is focused on the simulation and analytical model in gof the electromagneticpropagationin sideharshmetallicenviron mentslikejetengines. A statistical electromagnetics based approach is proposed for efficient analysis of electromagnetic propagation inside jet engines, to establish a communication channel inside the environment. The study of electromagnetic propagation inside the jet engine compressors that are close to turbine blades faces several challenges due to the design complexity. The complex geometry environment combined with the inhomogeneous volumetric target render traditional analytical and simulation modeling techniques highly inefficient. To address this issue, jet engine environment is decomposed into different segments and proposed two different approaches in this thesis. The first approach is an innovative dynamic simulation approach based on statistical electromagnetic methods and inspired by analysis of mechanically stirred reverberation chambers. In the second approach, a novel statistical excitation method is applied to develop an equivalent model for the fields generated by a fixed excitation inside a jet engine with dynamic rotating blade. Hence, the jet engine is considered as a static system without blade rotation, but with a random excitation. The dynamic and static systems have been compared using full wave simulation method and numerical methods. The results proved that there is a statistical equivalence between the dynamic and the static systems. Later, to successfully build a wireless network that works in harsh jet engine environment, an antenna system that is thin, possess desired radiation properties and conformal to the curved jet engine surface is designed and developed. This design is to establish a communication link between thewirelesssensorsinsidethejetenginewith thereceivingantennasandh ence the entire system is designed for ISM band of frequency. The proposed antenna radiates symmetrically around the normal axis, with a null in the boresight direction. EED NEWSLETTER VOL. 2, ISSUE 1

VOLUME 1, ISSUE 1 PAGE 21 Software tools: Ansys HFSS, Ansys designer, IE3D, MATLAB Publications A. Krishna, T. Khattab, A.F. Abdelaziz and M. Guizani, “Analysis of Electromagnetic Fields inside Jet Engines: A Journey from Numerical and Experimental Analysis to Statistical Analysis”, IEEE Microwave Magazine, Nov 2016. EED NEWSLETTER VOL. 2, ISSUE 1

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