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You searched for +publisher:"Mississippi State University" +contributor:("Joni Kluss"). Showing records 1 – 3 of 3 total matches.

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1. Zohrabi, Nasibeh. Distributed predictive control for MVDC shipboard power system management.

Degree: EdD, Electrical and Computer Engineering, 2018, Mississippi State University

Shipboard Power System (SPS) is known as an independent controlled small electric network powered by the distributed onboard generation system. Since many electric components are tightly coupled in a small space and the system is not supported with a relatively stronger grid, SPS is more susceptible to unexpected disturbances and physical damages compared to conventional terrestrial power systems. Among different distribution configurations, power-electronic based DC distribution is considered the trending technology for the next-generation U.S. Navy fleet design to replace the conventional AC-based distribution. This research presents appropriate control management frameworks to improve the Medium-Voltage DC (MVDC) shipboard power system performance. Model Predictive Control (MPC) is an advanced model-based approach which uses the system model to predict the future output states and generates an optimal control sequence over the prediction horizon. In this research, at first, a centralized MPC is developed for a nonlinear MVDC SPS when a high-power pulsed load exists in the system. The closed-loop stability analysis is considered in the MPC optimization problem. A comparison is presented for different cases of load prediction for MPC, namely, no prediction, perfect prediction, and Autoregressive Integrated Moving Average (ARIMA) prediction. Another centralized MPC controller is also designed to address the reconfiguration problem of the MVDC system in abnormal conditions. The reconfiguration goal is to maximize the power delivered to the loads with respect to power balance, generation limits and load priorities. Moreover, a distributed control structure is proposed for a nonlinear MVDC SPS to develop a scalable power management architecture. In this framework, each subsystem is controlled by a local MPC using its state variables, parameters and interaction variables from other subsystems communicated through a coordinator. The Goal Coordination principle is used to manage interactions between subsystems. The developed distributed control structure brings out several significant advantages including less computational overhead, higher flexibility and a good error tolerance behavior as well as a good overall system performance. To demonstrate the efficiency of the proposed approach, a performance analysis is accomplished by comparing centralized and distributed control of global and partitioned MVDC models for two cases of continuous and discretized control inputs. Advisors/Committee Members: Joni Kluss (committee member), Sherif Abdelwahed (committee member), Yong Fu (committee member), Masoud Karimi Ghartemani (committee member).

Subjects/Keywords: Model Predictive Control; Distributed Control; Medium-Voltage DC (MVDC); Shipboard Power Systems; Islanded DC Microgrid

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APA (6th Edition):

Zohrabi, N. (2018). Distributed predictive control for MVDC shipboard power system management. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10222018-160152/ ;

Chicago Manual of Style (16th Edition):

Zohrabi, Nasibeh. “Distributed predictive control for MVDC shipboard power system management.” 2018. Doctoral Dissertation, Mississippi State University. Accessed March 29, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10222018-160152/ ;.

MLA Handbook (7th Edition):

Zohrabi, Nasibeh. “Distributed predictive control for MVDC shipboard power system management.” 2018. Web. 29 Mar 2020.

Vancouver:

Zohrabi N. Distributed predictive control for MVDC shipboard power system management. [Internet] [Doctoral dissertation]. Mississippi State University; 2018. [cited 2020 Mar 29]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10222018-160152/ ;.

Council of Science Editors:

Zohrabi N. Distributed predictive control for MVDC shipboard power system management. [Doctoral Dissertation]. Mississippi State University; 2018. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10222018-160152/ ;

2. Dimitrov, Nikolay Krasimirov. An electroplastic internal state variable model for nonferromagnetic ductile metals.

Degree: PhD, Mechanical Engineering, 2019, Mississippi State University

A multi-physics Internal State Variable (ISV) theory that couples the thermo-elasto-visco-plastic-damage model of Bammann with electricity-related electromagnetic phenomena was formulated with internally consistent kinematics, thermodynamics, and kinetics. An innovative methodology to experimentally distinguish the ElectroPlastic (EP) effect from the thermal expansion was developed and applied to experimentally validate the proposed theoretical electro-mechanical model. Three series of quasi-static uniaxial tension experiments with titanium, copper, and zinc were conducted and a quadratic dependence of the EP stress drop on the electric current density was observed. This study experimentally confirmed the existence of EP as an electron-dislocation interaction phenomenon. The significance of the non-EP effects in the electro-mechanical coupling problems was estimated. The experimental procedure limitations were thoroughly discussed as well as the sensitivity and uncertainty, associated with each of the model parameters. Conclusions and suggestions for future work supplement the study. This piloting work on electro-mechanical coupling opened new horizons for modeling and experimental observation of the electroplastic effect. Advisors/Committee Members: Joni Kluss (committee member), Douglas Bammann (committee member), Yucheng Liu (committee member), Mark Horstemeyer (committee member).

Subjects/Keywords: nonferromagnetic metal; electric current pulse; electro-mechanical; electroplastic

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Dimitrov, N. K. (2019). An electroplastic internal state variable model for nonferromagnetic ductile metals. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03012019-184641/ ;

Chicago Manual of Style (16th Edition):

Dimitrov, Nikolay Krasimirov. “An electroplastic internal state variable model for nonferromagnetic ductile metals.” 2019. Doctoral Dissertation, Mississippi State University. Accessed March 29, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03012019-184641/ ;.

MLA Handbook (7th Edition):

Dimitrov, Nikolay Krasimirov. “An electroplastic internal state variable model for nonferromagnetic ductile metals.” 2019. Web. 29 Mar 2020.

Vancouver:

Dimitrov NK. An electroplastic internal state variable model for nonferromagnetic ductile metals. [Internet] [Doctoral dissertation]. Mississippi State University; 2019. [cited 2020 Mar 29]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03012019-184641/ ;.

Council of Science Editors:

Dimitrov NK. An electroplastic internal state variable model for nonferromagnetic ductile metals. [Doctoral Dissertation]. Mississippi State University; 2019. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03012019-184641/ ;

3. Gharghabi, Pedram. Experimental and numerical studies of lightning strike induced damage to carbon fiber epoxy composites.

Degree: PhD, Electrical and Computer Engineering, 2018, Mississippi State University

The objective of this study is to investigate the interaction between a lightning strike and carbon/fiber composites. The first approach is to characterize the damage development in a composite structure subjected to simulated lightning strikes. Several existing studies have acknowledged that the lightning induced damaged can be categorized into two separate domains of damage; a primary domain of damage that occurs at the attachment point, and a secondary domain of damage that is typically formed around the attachment point. Quantitative studies of the causes of the primary damage domain are not satisfactory for explaining the secondary damage domain and thus, these two domains are produced by presumably different mechanisms. There have been many reports and studies focused on the inspection of the primary damaged area. However, the secondary domain of damage has not yet been fully explained and understood. An experimental setup was configured with a recommissioned lightning current simulator to generate artificial lightning strikes consistent with the existing standard for lightning protection testing used in the aerospace industry. Carbon/epoxy composite laminates in various layups and Pultruded Rod Stitched Efficient Unitized Structure (PRSEUS) panels were subjected to high impulse currents of different magnitudes. The lightning induced damage to the protected and non-protected composite laminates and PRSEUS panels were evaluated, and the influence of different variables such as current magnitude, strike location, and laminate layup were studied. An interesting observation was the secondary damage area that expanded laterally beyond the intense damage area. The structure of a composite panel is such that it forces the current to flow along the carbon fibers directions, as opposed to metals where the relatively isotropic conductivity of the metal allows current to distribute radially. It is argued in this work that the secondary domain of damage may be related to the anisotropic electrical conductivity property of the composite panels. A comprehensive theory based on multidimensional electromagnetic field simulation was proposed to reveal the root cause mechanisms of the unique patterns of secondary damage in the carbon composite structural materials tested with simulated lightning current impulses. Advisors/Committee Members: Joni Kluss (chair), Michael Mazzola (committee member), Thomas Lacy (committee member), Patrick Donohoe (committee member).

Subjects/Keywords: arc simulation; electric arc; lightning effect; plasma-anode interaction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gharghabi, P. (2018). Experimental and numerical studies of lightning strike induced damage to carbon fiber epoxy composites. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-09052018-095331/ ;

Chicago Manual of Style (16th Edition):

Gharghabi, Pedram. “Experimental and numerical studies of lightning strike induced damage to carbon fiber epoxy composites.” 2018. Doctoral Dissertation, Mississippi State University. Accessed March 29, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-09052018-095331/ ;.

MLA Handbook (7th Edition):

Gharghabi, Pedram. “Experimental and numerical studies of lightning strike induced damage to carbon fiber epoxy composites.” 2018. Web. 29 Mar 2020.

Vancouver:

Gharghabi P. Experimental and numerical studies of lightning strike induced damage to carbon fiber epoxy composites. [Internet] [Doctoral dissertation]. Mississippi State University; 2018. [cited 2020 Mar 29]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-09052018-095331/ ;.

Council of Science Editors:

Gharghabi P. Experimental and numerical studies of lightning strike induced damage to carbon fiber epoxy composites. [Doctoral Dissertation]. Mississippi State University; 2018. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-09052018-095331/ ;

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