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Full-Text Articles in Mechanical Engineering
Multidimensional Optimal Droop Control For Dc Microgrids In Military Applications, Kaitlyn J. Bunker, Michael D. Cook, Wayne Weaver, Gordon Parker
Multidimensional Optimal Droop Control For Dc Microgrids In Military Applications, Kaitlyn J. Bunker, Michael D. Cook, Wayne Weaver, Gordon Parker
Michigan Tech Publications
Reliability is a key consideration when microgrid technology is implemented in military applications. Droop control provides a simple option without requiring communication between microgrid components, increasing the control system reliability. However, traditional droop control does not allow the microgrid to utilize much of the power available from a solar resource. This paper applies an optimal multidimensional droop control strategy for a solar resource connected in a microgrid at a military patrol base. Simulation and hardware-in-the-loop experiments of a sample microgrid show that much more power from the solar resource can be utilized, while maintaining the system’s bus voltage around a …
Properties Of Torrefied U.S. Waste Blends, Zhou Xu, Stas Zinchik, Shreyas Kolapkar, Ezra Bar Ziv, Ted Hansen, Dennis Conn, Armando G. Mcdonald
Properties Of Torrefied U.S. Waste Blends, Zhou Xu, Stas Zinchik, Shreyas Kolapkar, Ezra Bar Ziv, Ted Hansen, Dennis Conn, Armando G. Mcdonald
Michigan Tech Publications
Power generation facilities in the U.S. are looking for a potential renewable fuel that is sustainable, low-cost, complies with environmental regulation standards and is a drop-in fuel in the existing infrastructure. Although torrefied woody biomass, meets most of these requirements, its high cost, due to the use of woody biomass, prevented its commercialization. Industrial waste blends, which are also mostly renewable, are suitable feedstock for torrefaction, and can be an economically viable solution, thus may prolong the life of some of the existing coal power plants in the U.S. This paper focuses on the torrefaction dynamics of paper fiber-plastic waste …
Control Of Wave Energy Converters With Discrete Displacement Hydraulic Power Take-Off Units, Shangyan Zou, Ossama Abdelkhalik
Control Of Wave Energy Converters With Discrete Displacement Hydraulic Power Take-Off Units, Shangyan Zou, Ossama Abdelkhalik
Michigan Tech Publications
The control of ocean Wave Energy Converters (WECs) impacts the harvested energy. Several control methods have been developed over the past few decades to maximize the harvested energy. Many of these methods were developed based on an unconstrained dynamic model assuming an ideal power take-off (PTO) unit. This study presents numerical tests and comparisons of a few recently developed control methods. The testing is conducted using a numerical simulator that simulates a hydraulic PTO. The PTO imposes constraints on the maximum attainable control force and maximum stroke. In addition, the PTO has its own dynamics, which may impact the performance …
The Role Of Electron Irradiation History In Liquid Cell Transmission Electron Microscopy., Trevor H Moser, Hardeep Mehta, Chiwoo Park, Ryan T Kelly, Tolou Shokuhfar, James E Evans
The Role Of Electron Irradiation History In Liquid Cell Transmission Electron Microscopy., Trevor H Moser, Hardeep Mehta, Chiwoo Park, Ryan T Kelly, Tolou Shokuhfar, James E Evans
Michigan Tech Publications
In situ liquid cell transmission electron microscopy (LC-TEM) allows dynamic nanoscale characterization of systems in a hydrated state. Although powerful, this technique remains impaired by issues of repeatability that limit experimental fidelity and hinder the identification and control of some variables underlying observed dynamics. We detail new LC-TEM devices that improve experimental reproducibility by expanding available imaging area and providing a platform for investigating electron flux history on the sample. Irradiation history is an important factor influencing LC-TEM results that has, to this point, been largely qualitatively and not quantitatively described. We use these devices to highlight the role of …
Effective Turning Motion Control Of Internally Actuated Autonomous Underwater Vehicles, Saeedeh Ziaeefard, Brian R. Page, Anthony Pinar, Nina Mahmoudian
Effective Turning Motion Control Of Internally Actuated Autonomous Underwater Vehicles, Saeedeh Ziaeefard, Brian R. Page, Anthony Pinar, Nina Mahmoudian
Michigan Tech Publications
This paper presents a novel roll mechanism and an efficient control strategy for internally actuated autonomous underwater vehicles (AUVs). The developed control algorithms are tested on Michigan Tech’s custom research glider, ROUGHIE (Research Oriented Underwater Glider for Hands-on Investigative Engineering), in a controlled environment. The ROUGHIE’s design parameters and operational constraints were driven by its requirement to be man portable, expandable, and maneuverable in shallow water. As an underwater glider, the ROUGHIE is underactuated with direct control of only depth, pitch, and roll. A switching control method is implemented on the ROUGHIE to improve its maneuverability, enabling smooth transitions between …