MRI-Compatible Lower Leg Exerciser Client: Alejandro Roldan Advisor: Naomi Chesler Team: Deborah Yagow (Leader) Amy Lenz (BSAC) Colleen Farrell (Communicator) Val Maharaj (BWIG) Week 13: November 27-December 3 Problem Statement The goal of this project is to design and construct a lower leg exerciser that is compatible with MR imaging and echocardiography to be used during cardiopulmonary research on pulmonary hypertension patients and healthy volunteers. The device must have repeatable loads that can be measured and displayed to the patient via biofeedback. Last Week’s Goals - Finish ultrasound testing with Claudia and compile data - Finish workload calculations - Finish SolidWorks and poster - Present on Friday Summary of Accomplishments - Construction additions tweaked - Ran another Ultrasound test with Claudia - Completed poster - Completed SolidWorks schematic and FEA analysis - Met with Professor Bonazza This Week’s Goals - Replace problem bracket screws - Finish final report - Complete notebooks - MRI test device with Oliver on Wednesday Difficulties During ultrasound testing, meeting with Alejandro, and device transportation, we definitely saw areas on our device that will be improved and strengthened next semester when we are able to buy more materials. The only information on our fan blade we were able to obtain from the manufacturer are plots of Airflow CFM, Efficiency CFM/Watt input, and Current Draw (Amps) vs. Static Pressure In. H20. After talking with EMA aerodynamics Prof. Bonazza, he said there is really no equation to properly approximate our system. He said if we could find the torque coefficient of our fan we’d be all set, since we know the equations to get power from that. We haven’t yet found the measurement tools available in order to experimentally measure ourairflow; we will search further and contact more professors in different departments to try to get that information in the final report. Next semester we will simply have to replace the fan with one that has a full spec sheet, or switch to a braking resistance system. For presentation we will set out the methodology of how we would go about determining workload, and how it is incremental for different RPM. During our final meeting next week we’ll be happy to talk about this more in-depth.Activities Previous Project Hours Colleen: 30.25 Val: 36.25 Amy: 27.75 Deb: 37.25 Team: 42.75 Total: 172.25 11/28/09 12/01/09 12/03/09 11/27/09 11/28/09 12/01/09 12/02/09 12/03/09 Deborah Amy Team Emails to professors and workload research Met with EMA Aerodynamics Prof. Bonazza Progress report Stress calculations Notebook updates and workload research Exercise data trials, FEA, and poster meeting Construction and final poster editing Presentation practice and poster editing 2 hrs 1 hr 0.5 hr 4 hrs 4 hrs 7 hrs 2 hrs 5 hrs 11/27/09 11/30/09 11/30/09 12/03/09 Val Purchased pedal toe clip Compiled exercise data Poster making Poster printing and notebook updates 0.5 hr 0.75 hr 1 hr 2.5 hrs 12/03/09 11/30/09 11/30/09 12/02/09 Colleen & Deborah Val, Amy, Deb Colleen, Deb, Val Deb, Amy, Colleen Cancelled meeting with Dr. Reeder @ WIMR Ultrasound testing at hospital Phlange construction and metronome trials Meeting with Alejandro 1 hr 0.75 hr 2 hrs 0.75 hrProject Timeline Week ending: September October November December Task 18 25 2 9 16 21 30 6 13 20 27 4 9 Product Development Background Research Brainstorm Decision matrix First Prototype Construction Testing Deliverables (due) PDS Prelim. Report Poster Presentation
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