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Full-Text Articles in Mechanical Engineering

Lotka-Volterra Systems In Environments With Randomly Disordered Temporal Periodicity, Arvid Naess, Mikhail F. Dimentberg, Oleg Gaidai Aug 2008

Lotka-Volterra Systems In Environments With Randomly Disordered Temporal Periodicity, Arvid Naess, Mikhail F. Dimentberg, Oleg Gaidai

Mechanical Engineering Faculty Publications

A generalized Lotka-Volterra model for a pair of interacting populations of predators and prey is studied. The model accounts for the prey's interspecies competition and therefore is asymptotically stable, whereas its oscillatory behavior is induced by temporal variations in environmental conditions simulated by those in the prey's reproduction rate. Two models of the variations are considered, each of them combining randomness with "hidden" periodicity. The stationary joint probability density function (PDF) of the number of predators and prey is calculated numerically by the path integration (PI) method based on the use of characteristic functions and the fast Fourier ...


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.


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 ...


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 ...


Comparing Mathematical And Heuristic Approaches For Scientific Data Analysis, Aparna S. Varde, Shuhui Ma, Mohammed D. Maniruzzaman, David C. Brown, Elke A. Rundensteiner, Richard D. Sisson Jr. Jan 2008

Comparing Mathematical And Heuristic Approaches For Scientific Data Analysis, Aparna S. Varde, Shuhui Ma, Mohammed D. Maniruzzaman, David C. Brown, Elke A. Rundensteiner, Richard D. Sisson Jr.

Mechanical Engineering Faculty Publications

Scientific data is often analyzed in the context of domain-specific problems, for example, failure diagnostics, predictive analysis, and computational estimation. These problems can be solved using approaches such as mathematical models or heuristic methods. In this paper we compare a heuristic approach based on mining stored data with a mathematical approach based on applying state-of-the-art formulae to solve an estimation problem. The goal is to estimate results of scientific experiments given their input conditions. We present a comparative study based on sample space, time complexity, and data storage with respect to a real application in materials science. Performance evaluation with ...