Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures
description
Transcript of Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures
Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures
BackgroundBladed Disk Assemblies
BackgroundEngine Order Excitation
Conditions for ResonanceBackground
BackgroundVibration Reduction via Order-Tuned Absorbers
Background Self-tuning Impact Damper
Tuned Dampers
Sleeves
Chamber & End Caps
Turbine Blade
Vibration CharacteristicsFree Vibration – One DOF/Sector
Vibration CharacteristicsFree Vibration – One DOF/Sector
Vibration CharacteristicsFree Vibration – One DOF/Sector
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
Vibration CharacteristicsFree Vibration – One DOF/Sector
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
Vibration CharacteristicsFree Vibration – One DOF/Sector
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
Mathematical ModelBladed Disk Assembly with Absorbers
Mathematical ModelLinearized System Model
Modal AnalysisBlock Decoupling the EOM
Modal AnalysisSteady-State Modal Response
Modal AnalysisSteady-State Modal Response
Modal AnalysisSteady-State Modal Response
Special Cases
1. Blades Locked, Absorbers Free
– Gives Absorber Tuning Order
2. Blades Free, Absorbers Locked
– A Benchmark to evaluate absorber performance
3. Single Isolated Sector, Blade/Absorber Free
– Demonstrates the essential features of the full coupled system
Special Case 1Blades Locked, Absorbers Free
Special Case 2Blades Free, Absorbers Locked
Special Case 2Blades Free, Absorbers Locked
Special Case 3Single Isolated Sector, Blade/Absorber Free
Special Case 3Single Isolated Sector, Blade/Absorber Free
Special Case 3Single Isolated Sector, Blade/Absorber Free
Special Case 3Single Isolated Sector, Blade/Absorber Free
Special Case 3Single Isolated Sector, Blade/Absorber Free
Special Case 3Single Isolated Sector, Blade/Absorber Free
N = 10 Sectors, Blades/Absorbers FreeLinear Forced Response
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
Linear Forced Response
MOVIE
Linear Forced ResponseThe Effects of Detuning: No-Resonance Gap
Linear Forced ResponseSummary of Frequency Response
Summary• Linear, Perfectly Periodic System• Blades/Absorbers: absorber effective• Eigenfrequency structure: no resonance zone
• Effects of damping• Effects of mistuning• General-path absorbers• Multi-DOF blade models
– Nonlinear effects– Intentional mistuning
Directions for Future Work