Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Mazzola, Michael S.
Committee Member
Donohoe, J. Patrick
Committee Member
Ghartemani, Masoud Karimi
Committee Member
Yarahmadian, Shantia
Committee Member
Arnoldus, Hendrik F.
Date of Degree
5-6-2017
Document Type
Dissertation - Open Access
Major
Electrical Engineering
Degree Name
Doctor of Philosophy
College
James Worth Bagley College of Engineering
Department
Department of Computer Science and Engineering
Abstract
In the aspect of electric-ship grounding, the time-domain behavior of the ship hull is needed. The grounding scheme impacts the nature of voltage transients during switching events and faults, identifiability and locatability of ground faults, fault current levels, and power quality. Due to the large size of ships compared with the wavelengths of the desired signals, time-domain measurement or simulation is a time-consuming process. Therefore, it is preferred that the behavior be studied in the frequency-domain. In the frequency-domain one can break down the whole ship hull into small blocks and find the frequency behavior of each block (scattering parameters) in a short time and then connect these blocks and find the whole ship hull scattering parameters. Then these scattering pa- rameters should be transferred to the time-domain. The problem with this process is that the measured frequency-domain data (or the simulated data) is band-limited so, while calculating time-domain solutions, due to missing DC and low frequency content the time-domain response encounters causality, passivity and time-delay problems. Despite availability of several software and simulation packets that convert frequency-domain information to time-domain, all are known to suffer from the above mentioned problems. This dissertation provides a solution for computing the Time-Domain Impulse-Response for a system by using its measured or simulated scattering parameters. In this regard, a novel wavelet computational approach is introduced.
URI
https://hdl.handle.net/11668/20770
Recommended Citation
Rahmani, Maryam, "On the Calculation of Time-Domain Impulse-Response of Systems from Band-Limited Scattering-Parameters using Wavelet Transform" (2017). Theses and Dissertations. 3364.
https://scholarsjunction.msstate.edu/td/3364
Comments
Scattering-parameters||impulse response||time-domain||frequency-domain||causality||passivity||wavelet transform