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FoRTeS IIForced 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.
Presentation Outline
• Goals
• Apparatus
• Evaluation Methods / Data
• Summary
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
Apparatus
Driving Fan
Motor Plate and Shaft
Evaluation Methods
• Bench tests• Impact hammer excitation
• In rig tests• Travelling wave excitation• RPM Sweeps
• Correlation of data
Bench Test Natural Frequencies
N.F. #1 N.F. #2 N.F. #3
57.00 247.50 352.20
56.75 248.75 350.60
56.50 247.50 348.13
56.25 246.88 349.38
56.50 248.75 348.13
56.50 248.75 348.75
56.50 247.50 346.25
56.75 247.50 345.00
56.25 248.75 348.13
Inter BladePhase Angle
PSD Travelling Peak
PSD Travelling Peak
Normalized Maximum PSD1st Natural Frequency
Normalized Maximum PSD 2nd Natural Frequency
Normalized Maximum PSD
0
0.2
0.4
0.6
0.8
1
1.2
1820 1830 1840 1850 1860 1870 1880 1890 1900
RPM
Amplitude (Nromalized))
Blade 1
Blade 8
Blade 2
Blade 5
Blade 6
Blade 9
Blade 3
Blade 7
Blade 4
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
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