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Mechanical Engineering Commons

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Selected Works

2014

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Articles 1 - 30 of 119

Full-Text Articles in Mechanical Engineering

Flow-Field Design For Improving Hydrogen Recovery In A Palladium Membrane Tube., Wei-Hsin Chen Nov 2014

Flow-Field Design For Improving Hydrogen Recovery In A Palladium Membrane Tube., Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Determination Of Some Physical Properties Of Castor (Ricirus Communis) Oil, Innovative Research Publications Irp India, Odesanya Kazeem, Olasheu Taiwo, Adebiyi Kazeem, Durowoju Mondiu Nov 2014

Determination Of Some Physical Properties Of Castor (Ricirus Communis) Oil, Innovative Research Publications Irp India, Odesanya Kazeem, Olasheu Taiwo, Adebiyi Kazeem, Durowoju Mondiu

Innovative Research Publications IRP India

The energy crisis and shortage of fuel emanating from total dependence on mineral oil with resultant socioeconomic problems demand the need to explore the use of renewable energy as alternative. This study evaluates the physical properties of the castor (Ricirus communis) oil. A quantity of 35 kg dried base decorticated seeds of castor was locally obtained, volume of 5 litres of castor oil was extracted from the seeds using existing hydraulic press machine, while its physical properties was determined through laboratory analytical procedure of American Society for Testing and Materials analytical standard 960-52 (ASTM,D960-52). The properties determined were: viscosity ...


Free-Standing Inflatable Solar Chimney: Experiment And Theory, Peter Vorobieff, Andrea Mammoli, Nima Fathi, Vakhtang Putkaradze Nov 2014

Free-Standing Inflatable Solar Chimney: Experiment And Theory, Peter Vorobieff, Andrea Mammoli, Nima Fathi, Vakhtang Putkaradze

Nima Fathi

Solar chimneys (or solar updraft towers) offer an attractive way to use solar energy for production of baseload power. In a power plant of this type, sunshine heats the air under a wide greenhouse-like roofed collector surrounding the central base of a tall chimney. The heated air drives an updraft flow through the tower, whose energy is harvested with turbines. For a sufficiently large plant of this type, the thermal mass of the heated ground under the collector is sufficient to drive the flow even when the sun is down. The primary challenge in building the solar chimney power plant ...


Analyzing Sustainable, Localized Food Production Systems With A Systematic Optimization Model, Guiping Hu, Lizhi Wang, Susan W. Arendt, Randy Boeckenstedt Nov 2014

Analyzing Sustainable, Localized Food Production Systems With A Systematic Optimization Model, Guiping Hu, Lizhi Wang, Susan W. Arendt, Randy Boeckenstedt

Susan W. Arendt

Localized food production and sourcing is drawing increasing attention due to environmental and health considerations. In this study, we used population, dietary and geographical information to map potential foodsheds with emphasis on minimizing total geographic distribution. We also developed innovative protocols, metrics and optimization methods to analyze the foodshed localization of geographic areas. We used data from Iowa to analyze and validate the optimization model. This study can also be extended to other regions outside of Iowa.


Wime: A Departmental Effort To Improve Recruitment, Retention And Engagement Of Women Students In Mechanical Engineering, Sriram Sundararajan, Theodore J. Heindel, Baskar Ganapathysubramanian, Shankar Subramaniam Nov 2014

Wime: A Departmental Effort To Improve Recruitment, Retention And Engagement Of Women Students In Mechanical Engineering, Sriram Sundararajan, Theodore J. Heindel, Baskar Ganapathysubramanian, Shankar Subramaniam

Sriram Sundararajan

The Mechanical Engineering department at Iowa State University started the ‘Women in Mechanical Engineering’ (WiME) program 3 years ago. WiME is a student run, faculty moderated, and department funded program with a three pronged approach to enhance women participation in mechanical engineering – retention, outreach, and recruitment. WiME organizes various social and professional development activities that are intended to Provide a forum for women to socially interact with faculty and their peers; Provide students with women role models in engineering and academic professionals thereby helping to develop and sustain a network of professional colleagues and; Leverage the interests of the WiME ...


Geometric Effect On Cooling Power And Performance Of An Integrated Thermoelectric Generation-Cooling System., Wei-Hsin Chen Oct 2014

Geometric Effect On Cooling Power And Performance Of An Integrated Thermoelectric Generation-Cooling System., Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Single-Layer Graphene Oxide Reinforced Metal Matrix Composites By Laser Sintering: Microstructure And Mechanical Property Enhancement, Dong Lin Oct 2014

Single-Layer Graphene Oxide Reinforced Metal Matrix Composites By Laser Sintering: Microstructure And Mechanical Property Enhancement, Dong Lin

dong lin

No abstract provided.


Efficient Intersection Of Surface Normals With Milling Tool Swept Volumes For Discrete Three-Axis Nc Verification, James H. Oliver Oct 2014

Efficient Intersection Of Surface Normals With Milling Tool Swept Volumes For Discrete Three-Axis Nc Verification, James H. Oliver

James H. Oliver

An efficient algorithm is presented for intersecting vectors with swept solids which represent three-axis numerically controlled (NC) milling tool motions. The intersection calculation proceeds in hierarchical steps through a series of progressively more exact definitions of the shape of the tool swept volume. At each step, results of intermediate calculations are used to determine whether intersection with an exact representation of the solid is possible and, if so, where and how the swept volume model must be refined for the next step. This structure ensures that superfluous intersection calculations are minimized. This intersection technique has been successfully implemented as part ...


Nc Milling Simulation And Dimensional Verification Via Dexel Representation, James H. Oliver, Yunching Huang Oct 2014

Nc Milling Simulation And Dimensional Verification Via Dexel Representation, James H. Oliver, Yunching Huang

James H. Oliver

A method and apparatus are presented for five-axis NC milling process simulation and dimensional verification. An algorithm is utilized which employs a dexel representation of the workpiece and milling tool to reduce the complexity of the solid representation and associated Boolean operations. This representation is exploited to obtain high computational efficiency which affords real-time visual verification of milling processes. Simulation is presented as animated images while a unique discrete dexel verification algorithm simultaneously performs calculations of milling error between the emerging workpiece and actual design surfaces. Milling errors are depicted by levels of color on the milled workpiece. The verification ...


The Cognitive Implications Of Virtual Locomotion With A Restricted Field Of View, William E. Marsh, Jonathan W. Kelly, Veronica J. Dark, James H. Oliver Oct 2014

The Cognitive Implications Of Virtual Locomotion With A Restricted Field Of View, William E. Marsh, Jonathan W. Kelly, Veronica J. Dark, James H. Oliver

James H. Oliver

A study was conducted to examine the impact, in terms of cognitive demands, of a restricted field of view (FOV) on semi-natural locomotion in virtual reality (VR). Participants were divided into two groups: high-FOV and low-FOV. They were asked to perform basic movements using a locomotion interface while simultaneously performing one of two memory tasks (spatial or verbal) or no memory task. The memory tasks were intended to simulate the competing demands when a user has primary tasks to perform while using an unnatural interface to move through the virtual world. Results show that participants remembered fewer spatial or verbal ...


Effect Of Topology On The Adhesive Forces Between Electrospun Polymer Fibers Using A T-Peel Test, Florencia Ballarin, Todd Blackledge, Nicole Capitos Davis, Partrica Frontini, Gustavo Abraham, Shing-Chung Wong Oct 2014

Effect Of Topology On The Adhesive Forces Between Electrospun Polymer Fibers Using A T-Peel Test, Florencia Ballarin, Todd Blackledge, Nicole Capitos Davis, Partrica Frontini, Gustavo Abraham, Shing-Chung Wong

Todd A. Blackledge

Electrospinning provides an effective methodology to obtain high aspect ratio polymer fibers for biomimetic applications. In this article, we evaluate the effect of topology on adhesion between aligned fibers. Polycaprolactone is electrospun using two different setups: (i) a tip collector and (ii) a flat collector. The tip collector enables the fibers to self-align. When a fiber reaches the tip collector, the next fiber is repelled by the charge they carry, forcing the fibers to deposit in a parallel arrangement. The flat collector allows the fibers to deposit at random. The adhesion between the fiber mats is measured using a T-peel ...


Dielectric Properties Of Composite Materials During Damage Accumulation And Fracture, Md. Rassel Raihan Oct 2014

Dielectric Properties Of Composite Materials During Damage Accumulation And Fracture, Md. Rassel Raihan

Md. R Raihan

Fiber reinforced polymer matrix composite materials have many unique properties and their high performance makes them available to use in many advanced technologies i.e. aerospace, microelectronics, and energy storage. There is a correlation that exists between the long term behavior of those materials under combined mechanical, thermal, and electrical fields, and the functional properties and characteristics of the composite materials that requires a fundamental understanding of the material state changes caused by deformation and damage accumulation. This will ultimately lead, for example, to the design and synthesis of optimal multifunctional material systems. Composite materials are heterogeneous and the complex ...


The Effects Of Polymer Molecular Weight On Filament Thinning And Drop Breakup In Microchannels, Paulo E. Arratia, L-A Cramer, Jerry P. Gollub, Douglas J. Durian Oct 2014

The Effects Of Polymer Molecular Weight On Filament Thinning And Drop Breakup In Microchannels, Paulo E. Arratia, L-A Cramer, Jerry P. Gollub, Douglas J. Durian

Douglas J. Durian

We investigate the effects of fluid elasticity on the dynamics of filament thinning and drop breakup processes in a cross-slot microchannel. Elasticity effects are examined using dilute aqueous polymeric solutions of molecular weight (MW) ranging from 1.5×103 to 1.8×107. Results for polymeric fluids are compared to those for a viscous Newtonian fluid. The shearing or continuous phase that induces breakup is mineral oil. All fluids possess similar shear-viscosity (~0.2 Pa s) so that the viscosity ratio between the oil and aqueous phases is close to unity. Measurements of filament thickness as a function of time ...


Thermal Decomposition Dynamics And Severity Of Microalgae Residues In Torrefaction., Wei-Hsin Chen Sep 2014

Thermal Decomposition Dynamics And Severity Of Microalgae Residues In Torrefaction., Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Planning Of Methane Emission Control From Hoggery Using An Inexact Two-Stage Optimization Model., Wei-Hsin Chen Sep 2014

Planning Of Methane Emission Control From Hoggery Using An Inexact Two-Stage Optimization Model., Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Extracting Depth Information From Stereo Vision System, Using A Correlation And A Feature Based Methods, Mahmoud Abdelhamid Sep 2014

Extracting Depth Information From Stereo Vision System, Using A Correlation And A Feature Based Methods, Mahmoud Abdelhamid

Mahmoud M Abdelhamid

This thesis presents a new method to extract depth information from stereo-vision acquisitions using a feature and a correlation based approaches. The main implementation of the proposed method is in the area of Autonomous Pick & Place, using a robotic manipulator. Current vision-guided robotics are still based on a priori training and teaching steps, and still suffer from long response time. The study uses a stereo triangulation setup where two Charged Coupled Devices CCDs are arranged to acquire the scene from two different perspectives. The study discusses the details of two methods to calculate the depth; firstly a correlation matching routine is programmed using a Square Sum Difference SSD algorithm to search for the corresponding points from the left and the right images. The SSD is further modified using an adjustable Region Of Interest ROI along with a center of gravity based calculations. Furthermore, the two perspective images are rectified to reduce the required processing time. Secondly, a feature based approach ...


Me 283: Automatic Control Of Manufacturing Processes Course Redesign, John Lee Sep 2014

Me 283: Automatic Control Of Manufacturing Processes Course Redesign, John Lee

Sang-Joon John Lee

Poster summarizing course redesign activities for ME 283: Automatic Control of Manufacturing Processes.


Compatibility Of Medical-Grade Polymers With Dense Co2, A. Jiménez, G. Thompson, Michael Matthews, T. Davis, K. Crocker, Jed Lyons, A. Trapotsis Sep 2014

Compatibility Of Medical-Grade Polymers With Dense Co2, A. Jiménez, G. Thompson, Michael Matthews, T. Davis, K. Crocker, Jed Lyons, A. Trapotsis

Michael A. Matthews

No abstract provided.


Model Of A Mechanical Clock Escapement, John Wagner, David Moline, Eugene Vold Aug 2014

Model Of A Mechanical Clock Escapement, John Wagner, David Moline, Eugene Vold

John Wagner

The mechanical tower clock originated in Europe during the 14th century to sound hourly bells and later display hands on a dial. An important innovation was the escapement mechanism, which converts stored energy into oscillatory motion for fixed time intervals through the pendulum swing. Previous work has modeled the escapement mechanism in terms of inelastic and elastic collisions. We derive and experimentally verify a theoretical model in terms of impulsive differential equations for the Graham escapement mechanism in a Seth Thomas tower clock. The model offers insight into the clock’s mechanical behavior and the functionality of the deadbeat escapement ...


Assessment Of An Automotive Driving Simulator To Educate Novice Drivers, John Wagner, Qimin Yao, Kim Alexander, Philip Pidgeon Aug 2014

Assessment Of An Automotive Driving Simulator To Educate Novice Drivers, John Wagner, Qimin Yao, Kim Alexander, Philip Pidgeon

John Wagner

Novice drivers are more likely to be involved in vehicle crashes than more experienced drivers. Transportation system simulators, such as aerospace, automotive, and rail, have been used effectively over several decades in support of operator training and research studies. The immersive high-end automotive simulators tend to be large-scale, difficult to move, and relatively cost ineffective for widespread deployment. In contrast, a mobile vehicle training system often features simplistic environments which are not readily accepted by teenagers who evaluate the driving experience as compared to commercial video games. Consequently, a need exists for a low-cost portable automotive training system that provides ...


Focused Novice Driver Program - Assessment Results And Discussion, John Wagner, Lance Clark, Kim Alexander, Philip Pidgeon, Ken Rogich Aug 2014

Focused Novice Driver Program - Assessment Results And Discussion, John Wagner, Lance Clark, Kim Alexander, Philip Pidgeon, Ken Rogich

John Wagner

Skills and experiences of novice drivers do not favorably compare to motorists with significantly greater driving time and life experiences. Recent developments in driver education and training have focused on multistage instruction to take advantage of the time delay for driving privileges in Graduated Driver Licensing (GDL) systems as a means to provide additional instruction. A supplemental safe driving program tailored to address the risky behaviors of novice drivers has been developed by Clemson University Automotive Safety Research Institute (CU-ASRI) and the Richard Petty Driving Experience (RPDE). The program offers training in anticipatory safe driving strategies based on the leading ...


Energy Harvesting From Atmospheric Variations - Theory And Test, John Wagner, Gibran Ali, David Moline, Todd Schweisinger Aug 2014

Energy Harvesting From Atmospheric Variations - Theory And Test, John Wagner, Gibran Ali, David Moline, Todd Schweisinger

John Wagner

The last two decades have offered a dramatic rise in the use of digital technologies such as wireless sensor networks that require small isolated power supplies. Energy harvesting, a method to gather energy from ambient sources including sunlight, vibrations, heat, etc., has provided some success in powering these systems. One of the unexplored areas of energy harvesting is the use of atmospheric temperature variations to obtain usable energy. This paper investigates an innovative device to extract energy from atmospheric variations using ethyl chloride filled mechanical bellows. The apparatus consists of a bellows filled with ethyl chloride working against a spring ...


Nonlinear Control Strategy For Advanced Vehicle Thermal Management Systmes, John Wagner, M H. Salah, T H. Mitchell, D M. Dawson Aug 2014

Nonlinear Control Strategy For Advanced Vehicle Thermal Management Systmes, John Wagner, M H. Salah, T H. Mitchell, D M. Dawson

John Wagner

Advanced thermal management systems for internal combustion engines can improve coolant temperature regulation and servomotor power consumption by better regulating the combustion process with multiple computer controlled electromechanical components. The traditional thermostat valve, coolant pump, and clutch-driven radiator fan are upgraded with servomotor actuators. When the system components function harmoniously, desired thermal conditions can be accomplished in a power efficient manner. In this paper, a comprehensive nonlinear control architecture is proposed for transient temperature tracking. An experimental system has been fabricated and assembled which features a variable position smart valve, variable speed electric water pump, variable speed electric radiator fan ...


Development Of A Second-Stage Novice Driver Education And Training Program, John Wagner, M Jensen, F Switzer, K Alexander, P Pidgeon Aug 2014

Development Of A Second-Stage Novice Driver Education And Training Program, John Wagner, M Jensen, F Switzer, K Alexander, P Pidgeon

John Wagner

Novice drivers are overrepresented in traffic crashes and fatalities. Traffic crashes are the leading cause of death for 16 to 20 year olds and account for one in three deaths in this age group (NHTSA, 2008; CDC, 2010). Significant research has been conducted developing and analyzing driver education and training and education programs. Effective programs identify their target audiences and tailor the program paradigm and methods to their developmental needs. This paper develops a second-stage safe driver program for novice drivers focusing on classroom and behind-the-wheel instruction for four common driving skills and situations: braking, avoiding obstacles, losing control, and ...


Hydraulic Actuated Automotive Cooling Systems - Nonlinear Control And Test, John Wagner, M H. Salah, P M. Frick, D M. Dawson Aug 2014

Hydraulic Actuated Automotive Cooling Systems - Nonlinear Control And Test, John Wagner, M H. Salah, P M. Frick, D M. Dawson

John Wagner

The replacement of traditional automotive mechanical cooling system components with computer controlled servo-motor driven actuators can improve temperature tracking and reduce parasitic losses. The integration of hydraulic actuators in the engine cooling circuit offers greater power density in a smaller package space when compared with electric actuators. In this paper, a comprehensive nonlinear backstepping robust control technique is developed to regulate the engine coolant temperature by controlling a hydraulic coolant pump and radiator fan. An experimental test bench has been assembled to investigate the hydraulic automotive thermal system performance. Representative numerical and experimental results are presented and discussed. Overall, the ...


Evaluation Of On-Board Photovoltaic Modules Options For Electric Vehicles, Mahmoud M. Abdelhamid Aug 2014

Evaluation Of On-Board Photovoltaic Modules Options For Electric Vehicles, Mahmoud M. Abdelhamid

Mahmoud M Abdelhamid

This paper presents an overview of different commercial photovoltaic (PV) module options to power on-board electric vehicles (EVs). We propose the evaluation factors, constraints, and the decision-making criteria necessary to assess the suitability of this PV module for this application. The incorporation of quality function deployment (QFD) and the analytical hierarchy process (AHP) is the decision-making methodology used in this study. Our approach is innovative and robust in that the evaluation depends upon data collected from PV manufactures datasheets. Unlike traditional research, a hybrid AHP and QFD innovative decision-making methodology has been created, and current commercial PV market data for ...


Full-Field Vibrometry By High-Speed Digital Holography For Middle-Ear Mechanics, Ivo Dobrev Aug 2014

Full-Field Vibrometry By High-Speed Digital Holography For Middle-Ear Mechanics, Ivo Dobrev

Ivo Dobrev

Hearing loss affects approximately 1 in 10 people in the world and this percentage is increasing every year. Some of the most common courses for hearing loss are disorders of the human tympanic membrane (TM or eardrum) and middle-ear. Early detection and diagnosis of hearing loss as well as research and understanding of the hearing process depend on medical and research tools for quantification of the hearing capabilities, including the function of the human TM in the complex acoustic-mechanical transformation of environmental sounds into vibrations of the middle- and the inner-ear. Current ear exams are assessing the state of the ...


Model-Assisted Development Of A Laminography Inspection System, Robert J. Grandin, Joseph N. Gray Jul 2014

Model-Assisted Development Of A Laminography Inspection System, Robert J. Grandin, Joseph N. Gray

Robert Grandin

Traditional computed tomography (CT) is an effective method of determining the internal structure of an object through non-destructive means; however, inspection of certain objects, such as those with planar geometrics or with limited access, requires an alternate approach. An alternative is laminography and has been the focus of a number of researchers in the past decade for both medical and industrial inspections. Many research efforts rely on geometrically-simple analytical models, such as the Shepp-Logan phantom, for the development of their algorithms. Recent work at the Center for Non-Destructive Evaluation makes extensive use of a forward model, XRSIM, to study artifacts ...


Thermodynamic Analysis Of Separation Systems, Y. Demirel Jul 2014

Thermodynamic Analysis Of Separation Systems, Y. Demirel

YASAR DEMIREL

Separation systems mainly involve interfacial mass and heat transfer as well as mixing. Distillation is a major separation system by means of heat supplied from a higher temperature level at the reboiler and rejected in the condenser at a lower temperature level. Therefore, it resembles a heat engine producing a separation work with a rather low efficiency. Lost work (energy) in separation systems is due to irreversible processes of heat, mass transfer, and mixing, and is directly related to entropy production according to the Gouy-Stodola principle. In many separation systems of absorption, desorption, extraction, and membrane separation, the major irreversibility ...


Application Of Limited Mixing In The Hele-Shaw Geometry In Fabrication Of Janus Hydrogels, Md Mahmudur Rahman Jul 2014

Application Of Limited Mixing In The Hele-Shaw Geometry In Fabrication Of Janus Hydrogels, Md Mahmudur Rahman

Md Mahmudur Rahman

It is widely accepted that cells behave differently responding to the stiffness of their extracellular matrix (ECM). Such observations were made by culturing cells on hydrogel substrates of tunable stiffness. However, it was recently proposed that cells may sense how strongly they are tethered to ECM, not the local stiffness of ECM. To investigate both hypotheses, we developed a method to fabricate Janus polyacrylamide (PAAM) gels. We squeeze two drops of different concentrations in the Hele-Shaw geometry to generate radial Stokes flow. When the drops coalesce, limited mixing occurs at the interface due to the narrow confinement, and diffusion normal ...