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Articles 1 - 14 of 14

Full-Text Articles in Mechanical Engineering

Obtaining A Relationship Between Process Parameters And Fracture Characteristics For Hybrid Co2 Laser∕Waterjet Machining Of Ceramics, Dinesh Kalyanasundaram, Pranav Shrotriya, Palaniappa A. Molian Dec 2008

Obtaining A Relationship Between Process Parameters And Fracture Characteristics For Hybrid Co2 Laser∕Waterjet Machining Of Ceramics, Dinesh Kalyanasundaram, Pranav Shrotriya, Palaniappa A. Molian

Mechanical Engineering Publications

A combined experimental and analytical approach is undertaken to identify the relationship between process parameters and fracture behavior in the cutting of a 1mm thick alumina samples by a hybrid CO2 laser∕waterjet (LWJ) manufacturing process. In LWJ machining, a 200W power laser was used for local heating followed by waterjet quenching of the sample surface leading to thermal shock fracture in the heated zone. Experimental results indicate three characteristic fracture responses: scribing, controlled separation, and uncontrolled fracture. A Green’s function based approach is used to develop an analytical solution for temperatures and stress fields generated in the workpiece ...


Stochastic Event Reconstruction Of Atmospheric Contaminant Dispersion Using Bayesian Inference, Inanc Senocak, Nicolas W. Hengartner, Margaret B. Short, W. Brent Daniel Oct 2008

Stochastic Event Reconstruction Of Atmospheric Contaminant Dispersion Using Bayesian Inference, Inanc Senocak, Nicolas W. Hengartner, Margaret B. Short, W. Brent Daniel

Mechanical and Biomedical Engineering Faculty Publications and Presentations

Environmental sensors have been deployed in various cities for early detection of contaminant releases into the atmosphere. Event reconstruction and improved dispersion modeling capabilities are needed to estimate the extent of contamination, which is required to implement effective strategies in emergency management. To this end, a stochastic event reconstruction capability that can process information from an environmental sensor network is developed. A probability model is proposed to take into account both zero and non-zero concentration measurements that can be available from a sensor network because of a sensor’s specified limit of detection. The inference is based on the Bayesian ...


Parameter Estimation Of The Arterial System, James Charles Carter Ii Oct 2008

Parameter Estimation Of The Arterial System, James Charles Carter Ii

Mechanical & Aerospace Engineering Theses & Dissertations

There are a number of disorders that originate from or involve faulty operation of the cardiovascular system. Diseases such as atherosclerosis, diabetes and hypertension can have a debilitating effect on blood flow. This makes the tools for simulating the effects of such diseases on blood flow important. Measures, such as pulse wave velocity, that are generated by models of the cardiovascular system can be important indicators of cardiac health. Although physically measurable, obtaining some parameters comes with a high cost and discomfort to the patient. Models can provide an assessment of many important parameters. The purpose of this project was ...


The Party’S Over: Sustaining Support Programs When The Funding Is Done, John Gardner, Pat Pyke, Cheryl Schrader, Janet M. Callahan, Amy Moll Jun 2008

The Party’S Over: Sustaining Support Programs When The Funding Is Done, John Gardner, Pat Pyke, Cheryl Schrader, Janet M. Callahan, Amy Moll

Mechanical and Biomedical Engineering Faculty Publications and Presentations

In the lifecycle of an engineering education grant, the phase where best practices are sustained and disseminated is perhaps the most crucial stage for maximizing impact. Yet this transition phase often receives the least attention as project team enthusiasm can wane, while funding tapers off, and faculty priorities are pulled in other directions. There are numerous obstacles associated with sustaining program changes, even those perceived as very valuable. Typical challenges are: What happens when the funding runs out? What grant-developed programs should be sustained by the university? Does the institution need to internally allocate resources in an annual budget large ...


Writing Research Proposal: Literature Review And Database Search, Mamoudou H. Dicko Prof. May 2008

Writing Research Proposal: Literature Review And Database Search, Mamoudou H. Dicko Prof.

Pr. Mamoudou H. DICKO, PhD

The maiden proposed research project should demonstrate that the present study will add a significant knowledge on the subject. The main objective of the literature research is to allow that the statement of the research need will clearly establish the objective of the new study.


Manual Wheelchair Handbook Study For The Massachusetts Department Of Mental Retardation, Daniel Asselin, Nikolas Ledoux, David Willens May 2008

Manual Wheelchair Handbook Study For The Massachusetts Department Of Mental Retardation, Daniel Asselin, Nikolas Ledoux, David Willens

Assistive Technology Resource Center Projects

No abstract provided.


An Analysis Of The Performance Of Foams Used In Hurling Helmets, Keith Norris, Stephen Tiernan May 2008

An Analysis Of The Performance Of Foams Used In Hurling Helmets, Keith Norris, Stephen Tiernan

Conference Papers

Abstract Head injuries can occur in most sporting activities. The seriousness of these injuries can vary greatly depending on the sport. Many sports such as American football, cricket, baseball and hurling try to reduce this risk by designing helmets that are suitable to be worn by the players. The National Standard Authority of Ireland (NSAI) has recently made great strides in this area with the introduction of the first comprehensive standard adopted for the sport I.S. 355:2006, which sets out new testing procedures that all new helmets must meet. The Gaelic Athletic Association (GAA) has also stated its ...


Testing And Analysis Of Low Cost Prosthetic Feet, Morgan Carpenter, Carolyn Hunter, Dean Rheaume Apr 2008

Testing And Analysis Of Low Cost Prosthetic Feet, Morgan Carpenter, Carolyn Hunter, Dean Rheaume

Assistive Technology Resource Center Projects

The Center for International Rehabilitation (CIR) is a non-profit organization working in developing countries to rehabilitate those who have lost their mobility after an amputation. CIR has developed a lower limb prosthetic (monolimb) for transtibial amputees, which is then rigidly attached to a prosthetic foot. CIR requested a study of the effect of coupling their monolimb with two existing prosthetic foot designs; the International Committee of the Red Cross’s SACH foot and Northwestern’s Shape and Roll (SR) prosthetic foot. The combination of the prosthetic feet and monolimb were modeled and studied using finite element analysis (FEA). The FEA ...


Analysis Of A Lower Limb Prosthesis, Victoria Richardson, Erin Vozzola Apr 2008

Analysis Of A Lower Limb Prosthesis, Victoria Richardson, Erin Vozzola

Assistive Technology Resource Center Projects

The Center for International Rehabilitation (CIR) has programs all over the world to provide people in developing countries with the training and equipment they need to supply prosthetic devices to local landmine victims. CIR has created a monolimb, which is a lower limb prosthesis where the socket and shank are molded from a single piece of thermoplastic material. The monolimb can be fabricated on-site with minimal equipment at a low-cost. The shank portion of the device, which replaces the tibial region of the leg, was investigated through a finite element analysis computer program, COSMOSWorks. The current prosthetic device utilized by ...


Caffeine Model Identification For Vigilance Performance Prediction, Chun-Hui Huang Apr 2008

Caffeine Model Identification For Vigilance Performance Prediction, Chun-Hui Huang

Mechanical & Aerospace Engineering Theses & Dissertations

The pharmacodynamics and pharmacokinetics of caffeine have been well characterized. In this study, a caffeine dynamic model is developed to describe its pharmacodynamic effects on vigilance performance. Validated biomathematical models developed to address both individual and group fatigue and alertness in a non-laboratory setting represent a tremendous commercial opportunity. First, a test data set with caffeine effects isolated from circadian and homeostatic effects is created. Then a modeling approach for input and output effects is developed and different model structures for the caffeine effects are considered. Observer/Kalman filter Identification (OKID) algorithm is proposed and developed to identify the caffeine ...


Force Measurement And Evaluation For Surgical Cutting Applications: Development Of An Effective Characterisation Testbed, Dean Callaghan Mar 2008

Force Measurement And Evaluation For Surgical Cutting Applications: Development Of An Effective Characterisation Testbed, Dean Callaghan

Conference Papers

Sensorized instruments that cater for accurate measurement of the interaction forces (between biological tissue and instrument end-effector) during surgical procedures offer surgeons a greater sense of immersion during minimally invasive robotic surgery (MIRS). There is much ongoing research into force measurement/evaluation involving surgical graspers. However, comparatively little corresponding effort has been expended in the measurement and subsequent evaluation of forces between scissor blades and tissue. This paper presents the design and development of a force/strain measurement test apparatus, which will ultimately serve as an effective sensor characterisation and evaluation platform. Data acquired from the testing platform can be ...


Implementation Of Best Practices In The Operation Of The Wpi Assistive Technology Resource Center, Christopher Lyons, Paul Trimby Mar 2008

Implementation Of Best Practices In The Operation Of The Wpi Assistive Technology Resource Center, Christopher Lyons, Paul Trimby

Assistive Technology Resource Center Projects

The purpose of this project is to investigate and review the operations of the Assistive Technology Resource Center (ATRC) of WPI and provide a strategic future plan. To ensure the efficiency and efficacy of operations, it becomes necessary for organizations to execute a periodical review of the operations and overall status of the organization through a performance review. The ATRC was founded in 1999. Using the original Mission Statement of the ATRC as the focus of the review, an understanding of the best practices for the ATRC was developed through the use of surveys sent to clinical, educational, governmental and ...


Force Interaction Characterization Between Thrombin And Dna Aptamers, Janice Dionne Marquardt Jan 2008

Force Interaction Characterization Between Thrombin And Dna Aptamers, Janice Dionne Marquardt

Retrospective Theses and Dissertations

The first purpose of this study is to examine using AFM height measurements to detect changes in nucleic acid and protein interactions. This study used a thiolated adenine oligonucleotide (Poly A) and thymine DNA strand (Poly T) or 2 kDa poly(ethylene) glycol (PEG) as control, and the thrombin aptamer and thrombin for detection pair. The poly A and aptamer were printed using microcontact printing, then exposed to complementary species. There was a height change after binding to the target species, so it is feasible for height data to detect binding. The second purpose of this study is to use ...


Conditional Statistics Of Passive-Scalar Mixing In A Confined Wake Flow, Hua Feng, Michael G. Olsen, Rodney O. Fox, James C. Hill Jan 2008

Conditional Statistics Of Passive-Scalar Mixing In A Confined Wake Flow, Hua Feng, Michael G. Olsen, Rodney O. Fox, James C. Hill

Chemical and Biological Engineering Publications

Experimental results for conditional statistics in a confined turbulent wake were compared to the linear model and the transported probability density function (PDF) model for predicting the velocity conditioned on scalar mixture fraction and to a linear model for predicting the scalar mixture fraction conditioned on velocity. For velocity conditioned on scalar mixture fraction, the linear model was found to accurately predict the conditional transverse velocity, but for the conditional streamwise velocity, agreement between the experiments and the linear model was poor. The transverse conditional velocity was accurately predicted by the transported PDF model, but for the streamwise conditional velocity ...