P17415: Human Powered Centrifuge
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Customer Handoff & Final Project Documentation

Table of Contents

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Team Vision for Final Demo and Handoff

Three Week Plan

Three Week Plan

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Schedule

Schedule

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Test Results Summary

Primary and secondary testing was performed to determine the duration of test time. The following parameters were also considered; average voltages, total run time and cool down time between trials. Comparison study was executed with an electric centrifuge to validate the results from the primary and secondary testing.

Testing Procedure

Analysis

Hematocrit Data Table

Hematocrit Data Table

Link to the live document here
Duration Model

Duration Model

This output shows us that we can say with a 95% confidence that our statistical model is significant. This means that at least one of our factors is statistically significant and is able to explain or predict the response which is the duration time of our hematocrit test. The model was used to predict the fitted duration time given our ideal values for each of the input variables. With this model we constructed the following prediction interval,

Duration Prediction

Duration Prediction

This shows that if the centrifuge is operating with 12 TestTubes, an AvgVolt of 12, with a CoolDown time of 10 minutes, a TotalRunTime of 50 minutes; in order to get an AvgPCV of 47% we will need to run the centrifuge for 40 minutes. Specifically speaking of the time, this means that ideally the centrifuge can be warmed up for 10 minutes and then ran for 40 minutes. We recommend running it for 41 minutes to account for the time required for the centrifuge to ramp up and ramp down during testing.

Total Run Time and Duration Relationship

Total Run Time and Duration Relationship

The figure above shows that the duration time steadily decreases as the total run time increases. To be exact, for every 10 minutes that is added to the total duration time, the test duration time decreases by 1 minute. Also, we can see an error that our model is making because it assumes that the duration time and the total run time always has a linear relationship. It is impossible to have a total run time below 40 minutes while having a test duration time greater than 40 minutes. Finally, this simply proves that the longer the centrifuge runs for, (assuming that the battery level is at 12 volts) the more predicted test duration will decrease.
Average PCV Model

Average PCV Model

This output shows us that we can say with a 95% confidence that our statistical model is significant. This means that at least one of our factors is statistically significant and is able to explain or predict the response which is the average packed cell volume. With this model we constructed the following prediction interval,

Average PCV Prediction

Average PCV Prediction

This prediction interval is just an additional validation to show that our first model that was used to predict the duration time is correct. So with 12 TestTubes, 12 AvgVolt, 10 minutes CoolDown, 50 minutes TotalRunTime and 40 minutes Duration we will get a PCV of 47.3%. This is just a 0.3% difference from the AvgPCV value used for the duration time prediction.

Average PCV and Duration Relationship

Average PCV and Duration Relationship

This chart shows that there is in indirect relationship between the packed cell volume and the duration time. As the duration time increases the predicted packed cell volume decreases in a linear fashion. You can also see that as the total run time goes to zero the duration time begins to exceed 40 minutes.

Test Durations

Test Durations

Vibration Testing

Vibration Test Results

Vibration Test Results

The figure seen above shows some of the results from out vibration tests. As can be seen in the figure, all five tests proved to be relatively consistent, with the small increase in magnitude attributed to the motors getting up to operation temperature. Though this test wasn't incredibly useful for us running 12 volts through the motor, it may have been a more critical test if we had decided to stay with 24 volts.

Battery Life Testing

Battery Life

Battery Life

Before the ideal test length was determined, we conducted battery life tests. Using both a 1 and 2 battery setup, we ran the centrifuge repeatedly for 15 minute increments. This was meant to simulate the conditions of running several back to back tests. We found that the 1 battery set up tapers off after about 2.5 hours, while the 2 battery setup shows no real change. It's worth noting that the drop at the end of the 1 battery test was caused by the motor cooling down too much between test cycles.

Water Testing

Water Resistance Test PLan

Water Resistance Test PLan

Measurement Testing

Measuring Test PLan

Measuring Test PLan

Final Build

Final CAD Centrifuge Assembly

Final CAD Centrifuge Assembly

Final Centrifuge Assembly

Final Centrifuge Assembly

Final System Architecture Concept

System Architecture Concept

System Architecture Concept

Risk Tracking

Risk Management

Risk Management

Final Budget

Final BOM and Budget

Final BOM and Budget

Final Project Documentation

Operation and Maintenance Manual

Imagine RIT Poster

Poster

Poster

Plans for Wrap-up

Ashlynn's Three Week Plan

Raven's Three Week Plan


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