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Articles 1 - 11 of 11
Full-Text Articles in Engineering
Use Of Digital Twins To Mitigate Communication Failures In Microgrids, Andrew Eggebeen
Use Of Digital Twins To Mitigate Communication Failures In Microgrids, Andrew Eggebeen
Theses and Dissertations
This work investigates digital twin (DT) applications for electric power system (EPS) resilience. A novel DT architecture is proposed consisting of a physical twin, a virtual twin, an intelligent agent, and data communications. Requirements for the virtual twin are identified. Guidelines are provided for generating, capturing, and storing data to train the intelligent agent. The relationship between the DT development process and an existing controller hardware-in-the-loop (CHIL) process is discussed. To demonstrate the proposed DT architecture and development process, a DT for a battery energy storage system (BESS) is created based on the simulation of an industrial nanogrid. The creation …
A Design Strategy To Improve Machine Learning Resiliency Of Physically Unclonable Functions Using Modulus Process, Yuqiu Jiang
A Design Strategy To Improve Machine Learning Resiliency Of Physically Unclonable Functions Using Modulus Process, Yuqiu Jiang
Theses and Dissertations
Physically unclonable functions (PUFs) are hardware security primitives that utilize non-reproducible manufacturing variations to provide device-specific challenge-response pairs (CRPs). Such primitives are desirable for applications such as communication and intellectual property protection. PUFs have been gaining considerable interest from both the academic and industrial communities because of their simplicity and stability. However, many recent studies have exposed PUFs to machine-learning (ML) modeling attacks. To improve the resilience of a system to general ML attacks instead of a specific ML technique, a common solution is to improve the complexity of the system. Structures, such as XOR-PUFs, can significantly increase the nonlinearity …
Ultra Fast Dc Switch, Ian A. Buck
Ultra Fast Dc Switch, Ian A. Buck
Theses and Dissertations
With advancements in power electronics, DC power systems are a strong contender forfuture power system and shipboard application studies. However, to ensure proper DC power systems, protection engineers must develop different DC protection schemes to maintain proper system protection levels. The critical issue behind developing DC protection devices is that the signal never crosses zero naturally, as in AC circuit breakers and AC disconnect switches. There is also a necessity for galvanic isolation in the DC protection system. A method developed is pairing a mechanical commercial-off-the-shelf vacuum interrupter, a Thomson coil actuator, and a current commutating drive circuit (CCDC). The …
Novel Non-Invasive Detection Of Thin Film Biofilm And Classification Of Deposits Using Machine Learning, Sachin Davis
Novel Non-Invasive Detection Of Thin Film Biofilm And Classification Of Deposits Using Machine Learning, Sachin Davis
Theses and Dissertations
Clean, safe, readily available water is vital for public health, irrespective of whether it is used for drinking, domestic use, food production, or recreational purposes. Globally, around two billion people use feces-contaminated water sources, which poses a high risk to the safety of drinking water due to the high probability of water contamination. Microbial-influenced corrosion is a significant problem in several industries, including but not limited to wastewater treatment, drinking water distribution systems, food industries, power plants, paper industries, and chemical manufacturing facilities. The presence of microorganisms causes around 70% of the corrosion in gas transmission pipelines, and corrosion accounts …
Reliability Assessment Of Electric Power Systems With Smart Monitoring Using Monte Carlo Simulation, Chia Min Lee
Reliability Assessment Of Electric Power Systems With Smart Monitoring Using Monte Carlo Simulation, Chia Min Lee
Theses and Dissertations
This thesis proposes a Markov model that combines smart monitoring with electrical components to analyze overall power system reliability. The Markov model accounts for the reliability factors of smart monitoring such as failure rates, fault detection rates, and repair rates to demonstrate the effectiveness of smart monitoring in reducing component failures. The Markov absorbing probability values are derived and used in IEEE RTS 79 to evaluate the impact of integrating smart monitoring on power system reliability. Through Sequential Monte Carlo Simulation, power system reliability indices such as LOLP, EDNS and EENS are calculated. The test cases consist of three scenarios …
Characterization, Simulation, And Test Method For Image Artifacts Due To Phase Drift Of The Saw Filter In The Magnetic Resonance Receiver, Gabriel T. Jacobs
Characterization, Simulation, And Test Method For Image Artifacts Due To Phase Drift Of The Saw Filter In The Magnetic Resonance Receiver, Gabriel T. Jacobs
Theses and Dissertations
The receiver for a Magnetic Resonance (MR) scanner is responsible for capturing the precise frequency and phase of extremely low-power RF signals emanating from the human body; and consequentially must minimize unexpected phase drift in the received signal. One well-known source for temperature-dependent phase drift in RF electronics is the Surface Acoustic Wave (SAW) filter. In this work, the phase drift due to temperature changes in the SAW filter of an MR receiver was evaluated for its potential effects on image quality using several image quality metrics. A lab bench method was developed to playback MR images using typical lab-equipment …
Embedded Ultrasonic Inspection Of Liquid Filled Pressure Vessels, Trevor Wenzel
Embedded Ultrasonic Inspection Of Liquid Filled Pressure Vessels, Trevor Wenzel
Theses and Dissertations
Structural health monitoring and ultrasonic inspection techniques can be used to inspect a structure for degradation. There are several different approaches for doing this including the use of an embedded sensing system which uses elastic wave propagation through the structure. Previous work using this method has explored ultrasonic inspection of a simple, flat plate structure, however, structures often have more complex geometry, and the flat plate offers only a basic understanding of elastic wave propagation. Therefore, experimental approaches and results drive how these techniques can be used for ultrasonic inspection of complex vessels where challenges arise due to the potential …
A Distributed Control System For Microgrids With Wide Dynamic Response Components, Hadi Akbari Haghighat
A Distributed Control System For Microgrids With Wide Dynamic Response Components, Hadi Akbari Haghighat
Theses and Dissertations
Inverters play a vital part in microgrid operations and control, boosting system flexibility and efficiency. However, their limited physical inertia makes them vulnerable to network-induced oscillations. Research is primarily focused on addressing this by adding inertia to the inverter side. Earlier analysis of stand-alone microgrids utilized pure inverter-based systems with droop control for power sharing among units, and generators were responsible for voltage and frequency control. Inverter-based systems without communication latency have been studied. However, these studies don't provide a complete dynamic model of microgrids, especially for hybrid microgrids. In this study, a systematic approach is presented to model a …
Allocation And Compilation Methodology For Modular Power Electronic Equipment Metamodels, William J. Koebel
Allocation And Compilation Methodology For Modular Power Electronic Equipment Metamodels, William J. Koebel
Theses and Dissertations
With the ongoing electrification of Navy vessels motivated by increased power demands, evolving operating environments, and more stringent pollution policies, modular distribution networks have been proposed to introduce survivability, affordability, and resiliency into future ship designs. A virtual prototyping process (VPP) has been introduced to produce scalable metamodels for the Leading Edge Architecture for Prototyping Systems (LEAPS) database that enables development of modular distribution networks on the U.S. Navy’s Smart Ship System Design (S3D) design platform. This work proposes an allocation and compilation methodology for use in the VPP that modularizes enabling technologies for integration into a modular distribution network …
Cellulose Nanocrystal Dielectric Elastomers, David Frailey
Cellulose Nanocrystal Dielectric Elastomers, David Frailey
Theses and Dissertations
Optical devices, such as filters and sensors, have numerous advantages including compactness in size and immunity from electromagnetic interference. The fabrication of optical devices often requires precision and complicated processing, resulting in expensive and delicate components. Cellulose nanocrystals (CNCs) are biomaterials that can self-assemble into liquid crystals, similar to those used in electronic displays. This material can function as an optical grating by reflecting/transmitting circularly polarized light at certain wavelengths and viewing angles. Since gratings are building blocks of optical systems, like lasers and lidars, their fabrication at low costs will enable the further proliferation of optical technologies. Furthermore, if …
Applications Of Surface Discharge Modeling, Simulation And Testing To Electrical Insulation Systems, Skyler Schwartz
Applications Of Surface Discharge Modeling, Simulation And Testing To Electrical Insulation Systems, Skyler Schwartz
Theses and Dissertations
Advances in power electronics and the increasing demand for highly power dense power distributionsystems have increased the demands for electrical insulation systems. A critical challenge in insulation system design is the prevention and mitigation of partial discharge which drives premature aging and failure of electrical assets. This work applies and validates a recently proposed model for surface discharge applied to the case of a laminated bus bar. The results from the modeling and testing shows the traditional concept of creepage, while essential for preventing a flashover events provides little insight into surface discharge. The approach to characterize the laminated bus …