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Full-Text Articles in Mechanical Engineering
An Improved Electron Pre-Sheath Model For Tss-1r Current Enhancement Computations, Chunpei Cai
An Improved Electron Pre-Sheath Model For Tss-1r Current Enhancement Computations, Chunpei Cai
Michigan Tech Publications
This report presents improvements of investigations on the Tethered Satellite System (TSS)-1R electron current enhancement due to magnetic limited collections. New analytical expressions are obtained for the potential and temperature changes across the pre-sheath. The mathematical treatments in this work are more rigorous than one past approach. More experimental measurements collected in the ionosphere during the TSS-1R mission are adopted for validations. The relations developed in this work offer two bounding curves for these data points quite successfully; the average of these two curves is close to the curve-fitting results for the measurements; and an average of 2.95 times larger …
The Influence Of Bmss On The Characterization And Modeling Of Series And Parallel Li-Ion Packs, Sandra Castano-Solis, Daniel Serrano-Jimenez, Lucia Gauchia, Javier Sanz
The Influence Of Bmss On The Characterization And Modeling Of Series And Parallel Li-Ion Packs, Sandra Castano-Solis, Daniel Serrano-Jimenez, Lucia Gauchia, Javier Sanz
Michigan Tech Publications
This work analyzes the effects of a BMS (battery management system) on the characterization and modeling of series and parallel connections of Li-ion cell packs. The Li-ion pack studied consists of four series modules connected in parallel. This pack has been characterized by means of charge, discharge and frequency tests. As a result of these tests, series and parallel influence on battery parameters have been determined. A model considering the effects of a BMS is established and compared with a model based on a single-cell approach. Experimental validations show that the single cell based approach gives poor results in comparison …
A New Gaskinetic Model To Analyze Background Flow Effects On Weak Gaseous Jet Flows From Electric Propulsion Devices, Chunpei Cai
A New Gaskinetic Model To Analyze Background Flow Effects On Weak Gaseous Jet Flows From Electric Propulsion Devices, Chunpei Cai
Michigan Tech Publications
Recent work on studying rarefied background and jet flow interactions is reported. A new gaskinetic method is developed to investigate two closely related problems. The first problem is how a collisionless background flow can affect a highly rarefied jet flow. The rarefied jet and background flow conditions are assumed available and described with seven parameters. Gaskinetic theories are applied and formulas are obtained for the mixture properties. Simulations are performed to validate these expressions, and excellent agreement is obtained. The second problem is to recover the collisionless background and jet flow parameters with limited measurements. A group of linearized equations …
Gaskinetic Modeling On Dilute Gaseous Plume Impingement Flows, Chunpei Cai
Gaskinetic Modeling On Dilute Gaseous Plume Impingement Flows, Chunpei Cai
Michigan Tech Publications
This paper briefly reviews recent work on gaseous plume impingement flows. As the major part of this paper, also included are new comprehensive studies on high-speed, collisionless, gaseous, circular jet impinging on a three-dimensional, inclined, diffuse or specular flat plate. Gaskinetic theories are adopted to study the problems, and several crucial geometry-location and velocity-direction relations are used. The final complete results include impingement surface properties such as pressure, shear stress, and heat flux. From these surface properties, averaged coefficients of pressure, friction, heat flux, moment over the entire flat plate, and the distance from the moment center to the flat …
Energy Optimization And Fuel Economy Investigation Of A Series Hybrid Electric Vehicle Integrated With Diesel/Rcci Engines, Ali Solouk, Mahdi Shahbakhti
Energy Optimization And Fuel Economy Investigation Of A Series Hybrid Electric Vehicle Integrated With Diesel/Rcci Engines, Ali Solouk, Mahdi Shahbakhti
Michigan Tech Publications
Among different types of low temperature combustion (LTC) regimes, eactively controlled compression ignition (RCCI) has received a lot of attention as a promising advanced combustion engine technology with high indicated thermal efficiency and low nitrogen oxides ( NOx" role="presentation" style="box-sizing: border-box; max-height: none; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">NOx ) and particulate matter (PM) emissions. In this study, an RCCI engine for the purpose of fuel economy investigation is incorporated in series hybrid electric vehicle (SHEV) architecture, …
Mitigation Of The Impact Of High Plug-In Electric Vehicle Penetration On Residential Distribution Grid Using Smart Charging Strategies, Chong Cao, Luting Wang, Bo Chen
Mitigation Of The Impact Of High Plug-In Electric Vehicle Penetration On Residential Distribution Grid Using Smart Charging Strategies, Chong Cao, Luting Wang, Bo Chen
Michigan Tech Publications
Vehicle electrification presents a great opportunity to reduce transportation greenhouse gas emissions. The greater use of plug-in electric vehicles (PEVs), however, puts stress on local distribution networks. This paper presents an optimal PEV charging control method integrated with utility demand response (DR) signals to mitigate the impact of PEV charging to several aspects of a grid, including load surge, distribution accumulative voltage deviation, and transformer aging. To build a realistic PEV charging load model, the results of National Household Travel Survey (NHTS) have been analyzed and a stochastic PEV charging model has been defined based on survey results. The residential …
Two-Temperature Dual-Phase-Lags Theory In A Thermoelastic Solid Half-Space Due To An Inclined Load, Ashraf M. Zenkour, Ahmed E. Abouelregal, Khaled A. Alnefaie, Nidal H. Abu-Hamdeh, Abdulmalik A. Aljinaidi, Elias C. Aifantis
Two-Temperature Dual-Phase-Lags Theory In A Thermoelastic Solid Half-Space Due To An Inclined Load, Ashraf M. Zenkour, Ahmed E. Abouelregal, Khaled A. Alnefaie, Nidal H. Abu-Hamdeh, Abdulmalik A. Aljinaidi, Elias C. Aifantis
Michigan Tech Publications
This article addresses the thermoelastic interaction due to inclined load on a homogeneous isotropic half-space in context of two-temperature generalized theory of thermoelasticity with dual-phase-lags. It is assumed that the inclined load is a linear combination of both normal and tangential loads. The governing equations are solved by using the normal mode analysis. The variations of the displacement, stress, conductive temperature, and thermodynamic temperature distributions with the horizontal distance have been shown graphically. Results of some earlier workers have also been deduced from the present investigation as special cases. Some comparisons are graphically presented to estimate the effects of the …
Exergy Study On The Effect Of Material Parameters And Operating Conditions On The Anode Diffusion Polarization Of The Sofc, Khalid Zouhri, Seong Young Lee
Exergy Study On The Effect Of Material Parameters And Operating Conditions On The Anode Diffusion Polarization Of The Sofc, Khalid Zouhri, Seong Young Lee
Michigan Tech Publications
In the presented work, a model is created in order to investigate the effect of different material parameters and operating conditions on the anode diffusion overpotential, which influence the exergy and energy efficiency of the solid oxide fuel cell (SOFC). In this research, it was demonstrated that the anode material parameters and operating conditions of the device components such as porosity, tortuosity, pore diameter, temperature, pressure and current density of the anode have various effects on the anode diffusion overpotential, which consequently affect the exergy and energy efficiency of the SOFC. The model has provided a strong direction on how …
Review Of Sensing Methodologies For Estimation Of Combustion Metrics, Libin Jia, Jeffrey D. Naber, Jason R. Blough
Review Of Sensing Methodologies For Estimation Of Combustion Metrics, Libin Jia, Jeffrey D. Naber, Jason R. Blough
Michigan Tech Publications
For reduction of engine-out emissions and improvement of fuel economy, closed-loop control of the combustion process has been explored and documented by many researchers. In the closed-loop control, the engine control parameters are optimized according to the estimated instantaneous combustion metrics provided by the combustion sensing process. Combustion sensing process is primarily composed of two aspects: combustion response signal acquisition and response signal processing. As a number of different signals have been employed as the response signal and the signal processing techniques can be different, this paper did a review work concerning the two aspects: combustion response signals and signal …
Electrophoretic Deposition Of Gallium With High Deposition Rate, Hanfei Zhang, Yiping Mao, Sunand Santhanagopalan, Dennis Desheng Meng
Electrophoretic Deposition Of Gallium With High Deposition Rate, Hanfei Zhang, Yiping Mao, Sunand Santhanagopalan, Dennis Desheng Meng
Michigan Tech Publications
In this work, electrophoretic deposition (EPD) is reported to form gallium thin film with high deposition rate and low cost while avoiding the highly toxic chemicals typically used in electroplating. A maximum deposition rate of ~0.6 μm/min, almost one order of magnitude higher than the typical value reported for electroplating, is obtained when employing a set of proper deposition parameters. The thickness of the film is shown to increase with deposition time when sequential deposition is employed. The concentration of Mg(NO3)2, the charging salt, is also found to be a critical factor to control the deposition …
Recent Advances In The Field Of Bionanotechnology: An Insight Into Optoelectric Bacteriorhodopsin, Quantum Dots, And Noble Metal Nanoclusters, Christopher Knoblauch, Mark Griep, Craig Friedrich
Recent Advances In The Field Of Bionanotechnology: An Insight Into Optoelectric Bacteriorhodopsin, Quantum Dots, And Noble Metal Nanoclusters, Christopher Knoblauch, Mark Griep, Craig Friedrich
Michigan Tech Publications
Molecular sensors and molecular electronics are a major component of a recent research area known as bionanotechnology, which merges biology with nanotechnology. This new class of biosensors and bioelectronics has been a subject of intense research over the past decade and has found application in a wide variety of fields. The unique characteristics of these biomolecular transduction systems has been utilized in applications ranging from solar cells and single-electron transistors (SETs) to fluorescent sensors capable of sensitive and selective detection of a wide variety of targets, both organic and inorganic. This review will discuss three major systems in the area …
Optimization Strategy For Resonant Mass Sensor Design In The Presence Of Squeeze Film Damping, Chengzhang Li, Michele H. Miller
Optimization Strategy For Resonant Mass Sensor Design In The Presence Of Squeeze Film Damping, Chengzhang Li, Michele H. Miller
Michigan Tech Publications
This paper investigates the design optimization of an electrostatically actuated microcantilever resonator that operates in air. The nonlinear effects of electrostatic actuation and air damping make the structural dynamics modeling more complex. There is a need for an efficient way to simulate the system behavior so that the design can be more readily optimized. This paper describes an efficient analytical approach for determining the optimum design for a microcantilever resonant mass sensor. One simple case is described. The sensor design is a square plate that is coated with a functional polymer and attached to the substrate with folded leg springs. …