1. Strain In a Rotating Shaft
Engineering 300 Open- Ended Project Strain of a Rotating Shaft
Joachim Pedersen & Michael Johnson – Spring 2008

2. How is Data Collected From a Rotating Sensor Array?
Slip Rings! And Carbon brushes!

3. Strength of PMMA

4. PMMA Tensile Performance
Elastic Modulus: GPa and GPa

5. Maximizing Sensitivity
Strain Gauges in full bridge configuration for ultimate sensitivity, 4 x that of a quarter bridge!

6. Data Acquisition System
Ability to collect large amount of data in a short time interval.
500 samples per second. 500Hz sample rate

7. PMMA Rod in Action:

8. Initial Results

9. Initial Results

10. Standard Deviation of Data

11. Trends from the Data Strain In a Rotating Shaft
Increases with increasing rotational speed
Increases dramatically when weight is added
Deflection increases with increased surface strain

12. Take it slow!

13. Predictions

14. Questions and Thanks Mr. Mike Strange is AWESOME!
McKee & Strubs Electric Motor Repairing

15. Other Videos-Unstable Sample

16. Heavy Vibration

17. System Limit, 30lbs Monofilament fishing line 25.2g @ > 1600RPM