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Texas A&M E3 Summer Research Program Class Project Jeffrey Derry June 27, 2007

Texas A&M E3 Summer Research Program Class Project Jeffrey Derry June 27, 2007. Topics… The question General TEA objectives Specific lesson objectives The experiment The test rig Graphs of the data Conclusions Extensions Acknowledgements. THE QUESTION

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Texas A&M E3 Summer Research Program Class Project Jeffrey Derry June 27, 2007

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  1. Texas A&M E3 Summer Research Program Class Project Jeffrey Derry June 27, 2007

  2. Topics… • The question • General TEA objectives • Specific lesson objectives • The experiment • The test rig • Graphs of the data • Conclusions • Extensions • Acknowledgements

  3. THE QUESTION Which of the given test materials provides the greatest damping on the harmonic motion of a given base material?

  4. General Objectives: • To identify the characteristics of a graph of a real world application • To use graphical analysis to justify a decision

  5. Specific Objectives: • To collect data using the TI-CBR • To import data into Excel • To identify relative maxima • To identify the period and frequency of a graph of harmonic motion • To use Excel to graph and interpret data • To determine which of the test materials has the greatest damping effect

  6. Experiment: • Each group of students will… • Set up the test rig according to specification, given the spec sheet and materials. • 2. For the base and 3 damping materials runs • A. Use the CBR to collect data (time, distance) • B. Use TI-Connect to export the data to Excel • C. Make a stat plot for the data • D. Identify the relative maxima for the test run • Determine the period and frequency for the • test run • 3. Present a data and graphical analysis of all graphs to determine which material has the greatest damping effect on the base material.

  7. Group Responsibilities Perform experiment Collect data Group-1 Import data into Excel Group-2 Interpret data Plan presentation Groups 1&2 NOTE: It is suggested that groups 1 and 2 switch responsibilities after test run 2.

  8. The Test Rig

  9. TEST RIG Fig-01

  10. TEST RIG Fig-02

  11. TEST RIG Fig-03

  12. 30 cm TI-83 TEST RIG Fig-04 CBR

  13. 10 cm 30 cm TI-83 TEST RIG Fig-05 CBR

  14. TEST RIG Fig-06

  15. BASE TEST RIG Fig-07

  16. Damping material RUBBER FOAM TEST RIG Fig-08

  17. Felt Vinyl Rubber Damping Materials

  18. Graphs of the Data

  19. Distance m Time sec Metal Base

  20. Distance m Time sec Felt

  21. Distance m Time sec Vinyl Foam

  22. Distance m Time sec Rubber Foam

  23. Response Comparison Distance (m) Time (sec) Base Felt Vinyl Rubber

  24. Conclusions • Using the data for each test run… • The approximate period for each is 0.096768 sec • The approximate frequency is 1/0.096768 or 10.33399 cycles/sec The felt material exhibited the greatest damping effect on the base material.

  25. Extensions • Discuss the theoretical approach to predicting harmonic motion • Use the TI-83 to regress the maxima data of set to identify damping factor, z • Discuss the use of damping materials in real world applications

  26. Acknowledgements Dr. Andrew Conkey Consultant, Fabricator Dr. Daejong Kim Mentor

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