Team Spirometer Progress Report June 25, 2009 – July 1, 2009 Team: Jeremy Glynn and Andrew Dias Client: David Van Sickle, PhD Dept. of Population Health Sciences UW School of Medicine and Public Health Phone: (608) 719-9531 e-mail: [email protected] Advisor: Mitch Tyler 2156 Engineering Centers Building Phone: (608) 262-5112 e-mail: [email protected] Goals for the past week • Meet with additional interns currently at University of Minnesota • Gather enough input to make informed decision on Lilly vs Fleisch type spirometer o Will hopefully get feedback from blog postings, e-mails, personal queries and laminar flow testing o Refine design matrix to encompass new input and evaluate results • Investigate software development options • Develop another newsletter • Continue to test alternate pressure sensors • Validate our fluid mechanics calculations with testing to ensure that the prototype resistance is indeed within ATS standards Accomplishments • Performed spirometer body testing on the new Fleisch and Lilly models o Lilly had poor responsiveness, but Fleisch generated linear relationship between flow and pressure o Preliminary decision to pursue Fleisch spirometer model in future prototypes Hope to get feedback from spirometry community regarding this decision • Attempted to correlate voltage to percent outputs with MPX2010 sensor o Used LabView, see “Testing Results June 25” document for full report o Summary: Output signal was very small, hard to get usable data over the noise • Successfully related pressure and output percent of new Honeywell sensor o See “Voltage to Percent Testing” for full testing report o Larger output signal of Honeywell sensor produced more usable data. • Met with another intern (Naresh) assisting our project o His focus is on regulatory affairs and he will be assisting us in writing the documentation necessary to meet India regulatory boards requirements • Met with two electrical engineers to begin laying out PCB design • Received source code for some of the ZMD softwareo The interns are using this code to develop our own program to acquire data from a USB port • Began to develop another newsletter o The first one had a 50% open rate. Hopefully, this can be a good source of feedback on our spirometer design. Goals for the upcoming week • Complete and distribute newsletter • Create detailed physical design specifications for a Fleisch spirometer o We will analyze the model to ensure it produces laminar flow and meets ATS flow resistance specifications o Manufacturing materials and part sources will also be described in the design o If possible, we can model the design in SolidWorks and run flow simulations • Draft preliminary PCB layout o After meeting with some ECE students, we have a better idea about layout. We will hopefully develop a draft in the next week that can be reviewed by someone more skilled than ourselves in PCB design • Acquire new Honeywell sensor with same specs as PCB-capable model o No sensor we currently possess has the same specs as the PCB model we want to use. • Start creating regulatory documentation as recommended by Naresh Difficulties • The Honeywell sensor we used in our testing is not available in a surface mount configuration. o A similar model is available, but it has a slightly lower sensitivity o This model is still more sensitive than the MPX2010, so we are pursuing using it • The resistance values we calculated experimentally from R = Pressure/Flow are extremely low and probably incorrect o This method still requires a lot of conversions and reliance on experimentally determined trendlines. o We need to figure out how to determine resistance experimentally because the proper calculations cannot be found. Also, it would be good to verify any calculations with actual test data. • David was out of town this week so we were unable to have our usual weekly meeting. We have kept in touch via e-mail • The contacts to which we submitted our software specifications have not yet replied with any feedback Areas we would like assistance/feedback • Discuss accrual of hours under the Tong R&D
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