Engineering Commons^™

Microfluidic Device And Method Using Double Anodic Bonding, Diane Peters, Stephen Forest, Gregory Mcgraw, Siddharth Harikrishna Mohan

Mechanical Engineering Patents

A microfluidic device for use with a microfluidic delivery system, such as an organic vapor jet printing device, includes a glass layer that is directly bonded to a microfabricated die and a metal plate via a double anodic bond. The double anodic bond is formed by forming a first anodic bond at an interface of the microfabricated die and the glass layer, and forming a second anodic bond at an interface of the metal plate and the glass layer, where the second anodic bond is formed using a voltage that is lower than the voltage used to form the first …

A Special Issue: Electric Machinery And Transformers, Huseyin R. Hiziroglu

Electrical & Computer Engineering Publications

As the demand for electrical energy increases worldwide, engineers and scientists have been investigating new electrical systems and materials to meet this demand economically, having large-scale planning and employing environmentally friendly energy production and energy-efficient systems for consumption to minimize adverse environmental effects. New applications such as renewable energy production, e-mobility, and aerospace technology can be considered within the scope of this perspective. Thus, it is a necessity to establish new paradigms in the design, construction, and selection of new materials and drive systems for electric machines and transformers, where such stringent requirements, as high power density, low weight, compact …

A Modeling Framework To Develop Materials With Improved Noise And Vibration Performance For Electric Vehicles, Javad Baqersad, Seyed Jamaleddin Mostafavi Yazdi, Seongchan Pack, Foroogh Rouhollahi

Mechanical Engineering Publications

The automotive and aerospace industries increasingly use lightweight materials to improve performance while reducing fuel consumption. Lightweight materials are frequently used in electric vehicles (EVs). However, using these materials can increase airborne and structure-borne noise. Furthermore, EV noise occurs at high frequencies, and conventional materials have small damping. Thus, there is an increasing need for procedures that help design new materials and coatings to reduce the transferred and radiated noise at desired frequencies. This study pioneered new techniques for microstructure modeling of coated and uncoated materials with improved noise, vibration, and harshness (NVH) performance. This work uses the microstructure of …

Analysis Of Shielding Effectiveness Against Electromagnetic Interference (Emi) For Metal-Coated Polymeric Materials, Javad Baqersad, Seyed Jamaleddin Mostafavi Yazdi, Andrej Lisitski, Seongchan Pack, Huseyin R. Hiziroglu

Mechanical Engineering Publications

Lightweight materials, such as polymers and composites, are increasingly used in the automotive and aerospace industries. Recently, there has been an increase in the use of these materials, especially in electric vehicles. However, these materials cannot shield sensitive electronics from electromagnetic interference (EMI). The current work investigates the EMI performance of these lightweight materials using an experimental setup based on the ASTM D4935-99 standard and EMI simulation using the ANSYS HFSS. This work studies how metal coating from zinc and aluminum bronze can improve the shielding performance of polymer-based materials, such as polyphenylene sulfide (PPS), polyetheretherketone (PEEK), and polyphthalamide (PPA). …

Queueing System With Potential For Recruiting Secondary Servers, Srinivas Chakravarthy, Alexander N. Dudin, Sergey A. Dudin, Olga S. Dudina

Industrial & Manufacturing Engineering Publications

In this paper, we consider a single server queueing system in which the arrivals occur according to a Markovian arrival process (MAP). The served customers may be recruited (or opted from those customers’ point of view) to act as secondary servers to provide services to the waiting customers. Such customers who are recruited to be servers are referred to as secondary servers. The service times of the main as well as that of the secondary servers are assumed to be exponentially distributed possibly with different parameters. Assuming that at most there can only be one secondary server at any given …

Difference In Bioimpedance Across The Knee In Un-Injured Young Adults, Patrick J. Atkinson, Theresa Atkinson, Allison Seeley, Seerut Dhillon

Mechanical Engineering Publications

Background

Knee injuries induce swelling and resolution of swelling may be a useful factor in identifying states of healing and time to return to sports activities. Recent work has suggested that bioimpedance can provide an objective measure of swelling following total knee arthroplasty (TKA) and therefore may also provide guidance for clinical decision-making following knee injury. This study measures knee bioimpedance in young, active people to help define baseline variability and factors that influence limb to limb differences.

Methods

Bioimpedance was measured via sensors placed at the foot/ankle and thigh, in positions similar to those suggested for monitoring post-TKA swelling. …

A Retrieval Queueing Model With Feedback, Agassi Melikov, Srinivas Chakravarthy, Sevinc Aliyeva

Industrial & Manufacturing Engineering Publications

A multi-server retrial queuing model with feedback is considered in this paper.Input flow of calls is modeled using a Markovian Arrival Process (M AP) and the service time is assumed to follow an exponential distribution. An arriving call enters into service should there be a free server. Otherwise, in accordance to Bernoulli trials, the call will enter into an infinite orbit (referred to as a retrial orbit) to retry along with other calls to get into service or will leave the system forever. After obtaining a service each call, independent of the others, will either enter into a finite orbit …

Analysis Of A Queueing Model With Map Arrivals And Heterogeneous Phase-Type Group Services, Srinivas R. Chakravarthy

Industrial & Manufacturing Engineering Publications

Queueing models have proven to be very useful in real-life applications to enable the practitioners to optimize the limited resources to conduct their businesses as well as offer services efficiently. In general, we can group such applications into two sectors: manufacturing and service. These two sectors cover everything we deal with on a day-to-day basis. Queues in which the services are offered in blocks (or groups or batches) are well established in the literature and have a wide variety of applications in practice. In this paper, we look at one such queueing model in which the arrivals occur according to …

System And Method For Determining Operating Deflection Shapes Of A Structure Using Optical Techniques, Javad Baqersad

Mechanical Engineering Patents

A system for measuring total operating deflection shapes of a structure includes one or more imagers , each including two cameras spaced apart from one another and each oriented and positioned to have corresponding fields of view of a different corresponding section of the structure , with the corresponding sections that may include overlap area of the structure within each of the different sections of the structure . Each of the cameras generates a corresponding data stream , which is communicated to a controller , which is configured to measure the response of the structure to an excitation , such …

Power Management Strategy Of A Pem Fuel Cell-Battery Powered Electric Vehicle, Susanta K. Das, Jinsu Kim

Mechanical Engineering Publications

A MATLAB-Simulink based mathematical vehicle simulation model is developed in this investigation to analyze power management strategy of a proton exchange membrane (PEM) fuel cell and battery powered electric vehicle. The vehicle simulation model incorporated a real- world commercial passenger vehicle operator’s drive cycle inputs and associated vehicle dynamics to determine accurate estimation of total onboard power requirements and withdrawal of power from the fuel cell and battery sources to meet the demand. The power management strategy is designed to meet the vehicle’s onboard power demand based on the availability of hybrid combi-nation of fuel cell and battery power sources. …

Acoustic Signature Analysis And Sound Source Localization For A Three-Phase Ac Induction Motor, Daniel Ludwigsen, Anand Krishnasarma, Seyed Jamaleddin Mostafavi Yazdi, Allan Taylor, Javad Baqersad

Natural Sciences Publications

As part of the recent electrification of the transportation industry, internal combustion engines are being coupled with or replaced by electric motors. This movement towards an electrified drivetrain poses new noise, vibration, and harshness (NVH) challenges related to electric motors. In this paper, the acoustic signature of an electric motor was analyzed to obtain a better understanding of the sound generated by these motors. This work provides an insight into an acoustic measurement technique that can be used to identify certain frequency bands that significantly contribute to the perceived sound. In the first part, the structural response of the motor …

Electrical Property Of Polypropylene Films Subjected To Different Temperatures And Dc Electric Fields, Huseyin R. Hiziroglu, Chuyan Zhang, Weichen Shi, Qiao Wang, Mingguang Diao

Electrical & Computer Engineering Publications

A polypropylene (PP) film is usually used as a dielectric material in capacitors as well as cables. However, PP films may degrade because of the combined effect of temperature and electric field. In an earlier study, plain PP films and PP films loaded with nano-metric natural clay were studied under sinusoidal (AC) electric fields at power frequency and temperatures above the ambient. To better understand the electrical characteristics of PP film under various conditions, the objective of this study is to determine the time-to-breakdown of the plain PP and PP filled with 2% (wt) natural nano-clay when subjected to time-invariant …

Confidence Of Graduate Students In Engineering Masters’ Programs: A Comparison Of Returners And Direct-Pathway Students, Diane Peters, Elizabeth Gross

Mechanical Engineering Presentations And Conference Materials

Confidence is a critical factor in the success of graduate students; those who are not confident of their ability to succeed will have greater difficulties in persisting and graduating with the degree that they seek. Therefore, cultivating confidence is an important part of equipping graduate students for success, and the question of where confidence comes from is an important one. In this study, 300 graduate students were surveyed, including both returners (students with a gap of at least five years between completing their undergraduate education and starting graduate study) and direct pathway students (students with a gap less than five …

Development Of An Online Course In Research For Undergraduate Students, Diane Peters, Ronald Kumon, Garielle Feeny

Mechanical Engineering Presentations And Conference Materials

This Work in Progress paper will cover the development of an online course in research practices for undergraduate students. Active participation in research is an important part of experiential learning, which can help to prepare students for careers in a variety of settings including industrial R&D departments, academia, and government research labs. Undergraduate students’ research experiences may be limited in their value, however, by the learning curve students face as they begin to conduct research. The quality of their training may also be limited, with some receiving excellent training and orientation from a strong research lab or faculty mentor, and …

Development Of Attachments For The Quanser Qube, Diane Peters, Aaron Joseph Michael Jones

Mechanical Engineering Presentations And Conference Materials

The Quanser Qube is an integrated servomotor lab hardware platform [1], shown in Figure 1. This platform includes not only the direct-drive brushed DC motor, but also two encoders as well as the data acquisition system. One encoder is used to measure the rotation of the DC motor’s shaft itself. It is supplied with two standard items, an inertia disk and an inverted pendulum. The inertia disk is a small aluminum part, which mounts to the equipment using magnets. The inverted pendulum also mounts to the equipment with magnets, with an encoder that plugs into the equipment to provide an …

Student Perceptions Of Connections Between An Introductory Dynamic Systems Class And Co-Op Work Experience, Diane Peters

Mechanical Engineering Presentations And Conference Materials

This work focuses on connections that students see between co-op work assignments and a specific class in their mechanical engineering curriculum, typically taken in the second half of their junior year or the first half of their senior year. Students in the course wrote an essay, as a required assignment, in which they reflected on the links between their co-op work and the course, and were asked for permission to use those essays in the professor’s research on this topic. Analysis of the essays shows that students typically did see connections; in many cases, these were connected to the course …

Quantum Chemistry Calculations For Metabolomics, Susanta K. Das, Ricardo M. Borges, Sean M. Colby, Arthur S. Edison, Oliver Fiehn, Tobias Kind, Jesi Lee, Amy T. Merrill, Kenneth M. Merz Jr., Thomas O. Metz, Jamie R. Nunez, Dean J. Tantillo, Lee-Ping Wang, Shunyang Wang, Ryan S. Renslow

Mechanical Engineering Publications

A primary goal of metabolomics studies is to fully characterize the small-molecule composition of complex biological and environmental samples. However, despite advances in analytical technologies over the past two decades, the majority of small molecules in complex samples are not readily identifiable due to the immense structural and chemical diversity present within the metabolome. Current gold-standard identification methods rely on reference libraries built using authentic chemical materials (“standards”), which are not available for most molecules. Computational quantum chemistry methods, which can be used to calculate chemical properties that are then measured by analytical platforms, offer an alternative route for building …

Queuing-Inventory Models With Map Demands And Random Replenishment Opportunities, Srinivas R. Chakravarthy, B. Madhu Rao

Industrial & Manufacturing Engineering Publications

Combining the study of queuing with inventory is very common and such systems are referred to as queuing-inventory systems in the literature. These systems occur naturally in practice and have been studied extensively in the literature. The inventory systems considered in the literature generally include (s, S)-type. However, in this paper we look at opportunistic-type inventory replenishment in which there is an independent point process that is used to model events that are called opportunistic for replenishing inventory. When an opportunity (to replenish) occurs, a probabilistic rule that depends on the inventory level is used to determine whether to avail …

Effect Of Neural Network On Reduction Of Noise For Edge Detection, Diane Peters, Enqi Zhang, James Z. Zhang

Mechanical Engineering Presentations And Conference Materials

Processing photographic images is important in many applications, among them the development of automated driver assistance systems (ADAS) and autonomous vehicles. Many techniques are used for processing images, including neural networks, other types of machine learning, and edge detection. One common issue with processing these photos is the presence of noise, whether caused by the camera itself or by physical conditions (e.g., weather conditions or dirt on road signs). In this paper, a neural network is used for noise reduction to improve edge detection results and tested with two kinds of noise, Gaussian and salt & pepper noise, and three …

Effect Of Ultra-High Pulse Frequency On The Resolution In The Electrochemical Deposition Of Nickel, Abishek Balsamy Kamaraj, Natalie Reed, Murali Sundaram

Industrial & Manufacturing Engineering Presentations And Conference Materials

Using localized electrochemical deposition (LECD) as a mask-less direct writing methodology, metal shapes are printed. The electrochemical double-layer capacitance at ultra-high frequencies is hypothesized to cause a localized deposition and the effect of pulse frequency on the current density is modeled to predict the deposition resolution and rate of deposition. Experimental results confirm that the deposition resolution and efficiency of the LECD process increase with the increase of pulse frequency. Deposition resolution 80% smaller than the tool diameter is feasible in the LECD of nickel used with a ø 250 μm tool at 1 MHz pulsed power.

Queueing Models With Map Arrivals Useful In Service Sectors, Srinivas R. Chakravarthy

Industrial & Manufacturing Engineering Publications

Queueing models have found applications in many fields, notably in service sectors. In this paper, we study queueing models that have significant applications in service sectors. We look at multi-server systems with MAP arrivals. We assume phase type services for single server systems and exponential services when dealing with multi-server systems. All arriving customers finding no idle server will not wait in the system to receive services but rather leave their information in a registry list. These customers will be reached out on a first-come-first-served basis (FCFS) by an idle server soon after completing its current service. The reach out …

How Students View The Role Of Faculty Advisors In The Swe Organization, Diane Peters, Maryam Darbeheshti, Gloria Guohua Ma, Karinna M. Vernaza, Alexa N. Rihana Abdallah, Christina Remucal, Stephanie G. Wettstein

Mechanical Engineering Presentations And Conference Materials

The Society of Women Engineers (SWE) collegiate sections attract many men and women to the society, and they can be among the largest and most active student organizations on the university campuses. A key factor to boost membership is the active involvement of faculty advisors, who serve as the liaison between SWE collegiate sections, the university, the National SWE organization, and professional SWE members. A group of SWE faculty advisors previously conducted a survey of faculty advisors and counselors, with advisors and counselors aggregated in the results, to determine what aspects of their role they consider most significant, and how …

Investigating The Experiences Of Military Professionals Who Return To Engineering Graduate School, Diane Peters, Elizabeth Gross

Mechanical Engineering Presentations And Conference Materials

Those graduate students known as returners, who have a gap of at least five years between their undergraduate degree conferral and their return to school for a graduate degree, have a wide variety of different experiences. While many of them spend those gap years in employment at an industrial employer, some of them serve in the military in various capacities. As military experience is different from working at an industrial employer, one might expect that these returners will be different in their outlook, skills, or approach to learning. In this study, the differences between military returners and returners from industry …

Professional Women Identify Their Professional And Personal Needs, Diane Peters, Anne M. Lucietto, Liza Ann Russell, Meher Rusi Taleyarkhan

Mechanical Engineering Presentations And Conference Materials

Professional women in various fields often express issues they encounter in being able to access quality materials to support professional and personal needs, as well as work-life balance. By studying a variety of modes through which these materials are generally obtained, including conference participation, informal communication via social media, and utilization of networking opportunities, several gaps were identified in available support for professionals. Professionals from various backgrounds were also surveyed in order to better identify their needs in terms of career development. Distributed through a variety of social networks including Facebook, Twitter, and LinkedIn, as well as the Indiana Secretary …

A Retrial Queueing Model With Thresholds And Phase Type Retrial Times, Srinivas R. Chakravarthy

Industrial & Manufacturing Engineering Publications

There is an extensive literature on retrial queueing models. While a majority of the literature on retrial queueing models focuses on the retrial times to be exponentially distributed (so as to keep the state space to be of a reasonable size), a few papers deal with nonexponential retrial times but with some additional restrictions such as constant retrial rate, only the customer at the head of the retrial queue will attempt to capture a free server, 2-state phase type distribution, and finite retrial orbit. Generally, the retrial queueing models are analyzed as level-dependent queues and hence one has to use …

Experimental Performance Evaluation Of A Hyper-Branched Polymer Electrolyte For Rechargeable Li-Air Batteries, Susanta K. Das, Joel Berry, Abhijit Sarkar

Mechanical Engineering Publications

A hyper-branched polymer (HBP) electrolyte is synthesized for rechargeable lithium-air (Li-air) battery cell and experimentally evaluated its performance in actual battery cell environment. Several real-world battery cells were fabricated with synthesized HBP electrolyte, pure lithium metal as anode and an oxygen permeable air cathode to evaluate reproducibility of the rechargeable Li-air battery cell. The effect of various conditions such as various HBP based electrolytes, discharge current −0.1~0.5 mA, cathode preparation processes and carbon contents on the battery cell performance were experimentally evaluated using the fabricated battery cells under dry air condition. Detailed HBP electrolyte synthesis procedures and experimental performance evaluation …

Effect Of Nano-Clay Filler On The Thermal Breakdown Mechanism And Lifespan Of Polypropylene Film Under Ac Fields, Chuyan Zhang, Weichen Shi, Qiao Wang, Zhicheng Si, Yankun Yang, Yifan Liao, Fuzeng Zhang, Huseyin R. Hiziroglu

Electrical & Computer Engineering Publications

The wide application of nanocomposites in the insulation system has greatly contributed to the performance improvement of power equipment. However, nano fillers are not omnipotent for improving the properties of composite dielectrics. In some situations, nano-modified materials are in fact a compromise of improving some performance features while sacrificing others. In this work, the breakdown characteristics and time-to-failure of polypropylene film with nano-clay fillers have been evaluated under combined thermal stress and AC electric fields. Experiments on plain polypropylene (PP) samples have also been carried out under the same test conditions as control. Test results indicated that the time-to-failure of …

Queueing-Inventory Models For A Two-Vendor System With Positive Service Times, Srinivas Chakravarthy, Khizer Hayat

Industrial & Manufacturing Engineering Publications

Queueing-inventory systems wherein the demands are processed with random service times have been getting a lot of attention recently. In such systems, each demand needs one or more inventory items and needs positive processing times. The inventory is generally replenished using -type policy and the lead times are assumed to be random. In this paper we introduce the concept of multiple vendors who will be responsible for the replenishment of inventory. Under the assumptions of a two-vendor system wherein the demands occurring according to a Markovian arrival process, the service times to be of phase type, and the lead times …

System And Method For Determining Operating Deflection Shapes Of A Structure Using Optical Techniques, Javad Baqersad

Mechanical Engineering Patents

A system for measuring total operating deflection shapes of a structure includes one or more imagers, each including two cameras spaced apart from one another and each oriented and positioned to have corresponding fields of view of a different corresponding section of the structure, with the corresponding sections that may include overlap area of the structure within each of the different sections of the structure. Each of the cameras generates a corresponding data stream, which is communicated to a controller, which is configured to measure the response of the structure to an excitation, such as a vibration or an impulse. …

In-Situ Extraction And Impregnation Of Black Walnut Husk Into Polyethylene Film Using Supercritical Carbon Dioxide With An Ethanol Modifier, Johnathon Wenzel, Veronica Moorman, Lihua Wang, Cheryl S. Samaniego, Michelle Ammerman, Isaiah Spencer-Williams, Mitchell Hall

Chemical Engineering Publications

Walnuts are commonly cultivated for their kernel, which is a rich source of antioxidant phenolic compounds. The husk likewise contains antioxidant and antimicrobial compounds, but is typically discarded without further processing. Antioxidant compounds are useful in creating active packaging films, but typically decompose at melt extrusion temperatures in polymer processing. Due to carbon dioxide's low critical point and ability to swell polymer films, supercritical carbon dioxide may be used to impregnate phenolic compounds into polymers. For this study, a novel technique is used to simultaneously produce walnut husk extracts and impregnate the extract into polymer films in the same batch …