Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"Time Domain Simulation"”.
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Fast time domain simulation for large order hybrid systems
Simulation is an important tool for the analysis and design of complex systems. As the models become more and more complex, more powerful simulation methods are desired. As an attempt to address this problem, a simulation scheme is proposed and developed in this thesis. The main objective of this …
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Time-Domain Simulation of Sound Propagation in Frequency-Dependent Materials
… of complicated geometries. The finite difference time-domain (FDTD) method is implemented on the linearized Euler equation (LEE), along with the immersed boundary (IB) method and other numerical techniques to simulate the acoustic wave propagation in air, water, porous media and biological …
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Finite-difference time-domain simulation of the Maxwell-Schrödinger system
A thorough study on the finite-difference time-domain (FDTD) simulation of the Maxwell-Schrödinger system is given in this thesis. This system is a very effective tool to simulate and study the light-matter interaction between electromagnetic (EM) radiation and a charged particle in the …
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Finite difference time domain simulation of subpicosecond semiconductor optical devices
… is a nonlinear phenomenon. Finite difference time domain (FDTD) technique is used to approximate the time dependent Maxwell's equations for full-wave analysis of the wave propagation. The dynamic transport is handled by solving the balance equations using the energy and momentum relaxation …
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Time domain simulation of hydroelastic response of ships in large amplitude waves
… schemes is likely to be complex and time consuming for practical applications. On the other hand two-dimensional methods, in spite of issues associated with accounting for forward speed, offer more possibilities of making practical advances in dealing with non-linearities.<br/><br/>A …
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Finite-difference time-domain simulation of electromagnetic scattering from objects under random media
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Parametric Excitation of a DWSC
… of motion (EOM) modeling the system varies with time. Parametric instability might be triggered for certain values of the parameters describing the time-varying coefficient. The DWSC, basically a stepped classic spar with a catamaran as its deck, because of certain unique features, may be …
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D-Q Frame Impedance Based Small-signal Stability Analysis of PV Inverters in Distribution Grids
… of state space equations and eigenvalues or use time-domain simulation methodology, which are based on the assumptions that detailed models of the grid and the PV inverters are accessible. Different from the previous literatures, this research employs Generalized Nyquist Criterion (GNC) method …
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Race Car Reverse Gear Design
This thesis presents the design, simulation, and installation of a reverse gear system for the RUSH SR, a lightweight, motorcycle-engine-powered race car that lacks built-in reverse capability. The proposed solution repurposes a high-torque automotive starter motor to drive the car in reverse …
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Protection and Cybersecurity in Inverter-Based Microgrids
… These faults can remain undetected for a long time and shutdown an IBR. This dissertation first proposes a method that reconstructs communicated signals using their autocorrelation and crosscorrelation measurements to make distributed control more resilient against FDI attacks. Next, this …
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Roll stabilization for fast monohulls by using passive and active lifting appendages
… code (ShipWaveANalysis), a state-of-the-art time domain simulation program, was used for the analysis of the linear free-surface flow around the vessel. Simulations were carried out in regular waves incident at angles ranging from 90⁰, 105⁰,120⁰,135⁰ and 150⁰ degrees relative to the ship …
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Design and Analysis of a Novel Wave Energy Converter With a Tension Leg Platform and Oscillating Proof Masses
… force was considered. Using both a frequency-domain approach and a time-domain simulation, the average power of these systems were calculated. To further maximize power, a control circuit and control law are introduced which increase the average power by multiple factors. By introducing …
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Design of a very high frequency resonant boost DC-DC converter
… of the topology and does not rely on lengthy time-domain simulation sweeps across circuit parameters to identify good designs. Additionally, a method to design semiconductor devices that are suitable for use in the proposed VHF power converter is presented. When the main semiconductor switch …
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Electrochemical impedance spectroscopy options for proton exchange membrane fuel cell diagnostics
… were surveyed, modelled, and simulated in the time domain and the results were used to create a database of ISFs. The time domain simulation was realized with a fractional order differential calculus state space approach. A primary goal of this work was to develop simple and cost effective …
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Methods to ensure the adequate primary frequency response of low inertia power systems
… with nonlinear PFR constraints that require the time-domain simulation of a differential and algebraic equation (DAE) model of the system. Tractable iterative solution approaches, in which rapidly solvable linear approximations of the nonlinear problems are formulated, are proposed. For large …
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Vortex-induced vibration of slender structures in unsteady flow
… for the VIV under top-end periodic motions. A time domain simulation of unsteady VIV was demonstrated by using Green's functions.
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Anti-reflection zinc oxide nanocones for higher efficiency thin-film silicon solar cells
… coating (AR coating). Finite Difference Time Domain simulation is used to estimate the optimal ZnO nanocone parameter (periodicity and height) to be applied on a single junction microcrystalline silicon ([mu]c-Si) solar cell. Relative improvement over 25% in optical performance is …
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DYNAMIC ENHANCEMENT OF THE FUTURE SASKPOWER INTERCONNECTED NORTH AND SOUTH SYSTEMS: THE HVDC INTERCONNECTION
… This thesis reports the results of digital time-domain simulation studies that are carried out to investigate the dynamic performance of a proposed 260 km, ± 110 kV, 50 MW Voltage-Sourced Converter HVDC tie-line that would connect SaskPower North and South systems. The potential problems …
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Electronic and Plasmonic Properties of Nano-Sized Gold/Strontium Titanate Interface
… Device design is assisted by finite-difference time-domain simulation of optical properties, targeted at near-infrared working range. Plasmon resonance frequency and intensity are demonstrated to be systematically tunable by varying device geometry. Photocurrent enhancement occurs around the …
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