1. FoRTeS II Forced Response Testing System II Andrew S. Meyer Scott E. Schrinner Anthony W. Taphorn Faculty Advisor: Joseph C. Slater, Ph.D. AFRL Advisor and Project Sponsor: Charles J. Cross, Ph.D.

2. Presentation Outline Goals Apparatus Evaluation Methods / Data Summary

3. Goals Design and construct a testing system that will cause a travelling wave forced response in a modeled turbine engine stage Precise computer control of motor for testing rig Investigate the vibration in tuned and de- tuned bladed disc assemblies

4. Apparatus

5. Driving Fan

6. Motor Plate and Shaft

7. Evaluation Methods Bench tests Impact hammer excitation In rig tests Travelling wave excitation RPM Sweeps Correlation of data

8. Bench Test Natural Frequencies N.F. #1N.F. #2N.F. #3 57.00247.50352.20 56.75248.75350.60 56.50247.50348.13 56.25246.88349.38 56.50248.75348.13 56.50248.75348.75 56.50247.50346.25 56.75247.50345.00 56.25248.75348.13

9. Inter Blade Phase Angle

10. PSD Travelling Peak

12. Normalized Maximum PSD 1st Natural Frequency

13. Normalized Maximum PSD 2nd Natural Frequency

14. Summary Successful completion of testing rig that causes a travelling wave forced response in a modeled turbine engine stage Precise computer controlled motor for testing rig Verification of in-rig testing via bench testing

15. Acknowledgements Special thanks to Dr. Charles J. Cross for sponsoring the project, advice, and input AFRL & UTC for funding and time extension Dr. Joseph C. Slater for advice and input Rockwell Automation, Twist, and Valeo for material donations and academic discounts WSU Machine Shop for manufacturing assistance