Browsing Engineering by Type "Dissertation"
Now showing items 1-20 of 235
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3D engineered capillary evaporators for enhanced critical heat flux and heat transfer coefficient in pool boiling and vapor chamber
(Wichita State University, 2020-07)A major challenge in pool-boiling heat transfer lies in the limit of the Critical Heat Flux (CHF) and Heat Transfer Coefficient (HTC), which is caused by the poor counterflow of liquid and vapor over a heated surface, ... -
A brain-inspired framework for evolutionary artificial general intelligence
(Wichita State University, 2020-05)From the medical field to agriculture, from energy to transportation, every industry is going through a revolution by embracing artificial intelligence (AI); nevertheless, AI is still in its infancy when compared to the ... -
A DC-DC converter with high-voltage step-up ratio and reduced-voltage stress for renewable energy generation systems
(Wichita State University, 2018-12)This research work presents a high gain direct current-direct current (DC-DC) converter which is derived from a traditional boost converter. Electrical power systems are changing from a centralized generation model to a ... -
A fast time series power flow method for active distribution system control applications
(Wichita State University, 2021-05)Power system balancing, where supply of energy has to equal demand all time, is a very important constraint for electric power systems. In recent years, number of Distributed Energy Resources (DERs) and penetration of ... -
A framework for measuring post-attack system-wide anonymity in anonymous communication systems
(Wichita State University, 2018-12)We develop techniques for measuring the amount of anonymity provided by anonymity systems in the aftermath of attacks. Anonymity systems are special systems that enable their users to carry out anonymous communication over ... -
A hybrid physics aware learning based transmission line resistance estimation algorithm for dynamic line rating application
(Wichita State University, 2021-05)The worldwide push towards a more intelligent, connected and reliable electric power delivery system has led to the propagation of a wide range of new technologies and ideas within the power grid infrastructure. Thus, the ... -
A meshing technique for unsteady computational fluid dynamics solutions for rapidly changing boundaries and internal configurations
(Wichita State University, 2015-05)A method to generate structured meshes is developed that allows for rapid re-meshing of CFD problems that have rapidly changing boundaries or internal configurations. These types of problems have typically been solved by ... -
A methodology utilizing spatial kinematics principles with angular rate sensor and accelerometer data to evaluate ATD head and leg flail kinematics in experimental aerospace seat dynamic impact testing
(Wichita State University, 2016-05)In dynamic aircraft crash testing, the head trajectory of an anthropomorphic test device (ATD) is typically recorded by photometric analysis from the high-speed video. While photometric analysis can provide useful data ... -
A modified individual measurements q-chart for monitoring the average of multiple stream processes
(Wichita State University, 2022-07)An increasing number of manufacturing processes involve multiple streams where the same type of item is produced in a parallel fashion. Traditionally, streams need to be monitored using separate control charts. The number ... -
A more comprehensive database for propeller performance validations at low Reynolds numbers
(Wichita State University, 2016-05)Validation is the essential process of evaluating the precision and reliability of analytical or computational solutions. In this dissertation, a series of comprehensive propeller wind tunnel tests were designed for ... -
A novel finite element for modeling a fastener in a lap joint assembly
(Wichita State University, 2014-12)This work documents the development of a novel finite element. This element introduces parameters that allow more accurate modeling for the specific application of mechanically fastened lap joints. The research here bridges ... -
A numerical homogenization approach to characterize in-plane anisotropic hyperelastic responses of a non-metallic honeycomb core
(Wichita State University, 2020-05)In this research, a numerical homogenization approach to predict the experimentally observed nonlinear elastic, orthotropic and asymmetric responses of non-metallic honeycomb cores under large in-plane deformations is ... -
A unified graphical approach for a PID controller design with a Smith predictor
(Wichita State University, 2022-12)This dissertation will extend the graphical method to the unified domain to design a PID controller augmented with a Smith predictor so that the closed loop system with deadtime meets nominal stability (NS), nominal ... -
Accuracy of video-based moment arm measurements and use with occupational low back disorder assessment methods
(Wichita State University, 2020-05)A large portion of occupational low back disorders (OLBDs) are due to industrial lifting activities. Prior research has clearly demonstrated the association between the external loadings and the risk of OLBD. Low back ... -
Adaptive control for fault tolerant autonomous launch and recovery
(Wichita State University, 2017-05)This work presents the use of adaptive control methodologies for the recovery to an aircraft carrier of an autonomous fixed wing aircraft. The control architecture used is model reference adaptive control that is implemented ... -
Additive and subtractive laser-pulsed nano/micro machining of metal alloys for enhanced material properties, and numerical validation
(Wichita State University, 2020-05)This research focuses on two different aspects of laser machining process, namely additive and subtractive laser micromachining, for inherent improvements to metallic surfaces. In both the processes, material surfaces are ... -
Adsorption and capillary transition-controlled thermal diodes and switches using heterogeneous nanostructures
(Wichita State University, 2017-12)Thermal diodes and switches are systems that enable us to control thermal transport, preferentially in one direction, and switch "on"/"off" on demand. The main challenges of existing thermal diodes and switches are poor ... -
Advanced control strategies of PMSM based wind energy conversion systems
(Wichita State University, 2021-07)Wind energy conversion system (WECS) is a system helps to produce the electrical energy by transforming the incoming air stream. This system has two basic steps. First step is the mechanical power which comes from the ... -
Advanced data-driven prognostics and health management for complex dynamic systems
(Wichita State University, 2016-05)Prognostics and health management (PHM) is an emerging engineering discipline that diagnoses and predicts how an engineered system will degrade its performance and when it will lose its partial or whole functionality. With ... -
Advanced failure diagnostics and prognostics for complex system health management
(Wichita State University, 2014-05)This dissertation consists of four published or accepted journal articles that address some of the key problems in prognostics and health management area (PHM). Effective health diagnostics and prognostics provide multifarious ...