Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures
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Transcript of Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures
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Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures
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BackgroundBladed Disk Assemblies
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BackgroundEngine Order Excitation
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Conditions for ResonanceBackground
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BackgroundVibration Reduction via Order-Tuned Absorbers
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Background Self-tuning Impact Damper
Tuned Dampers
Sleeves
Chamber & End Caps
Turbine Blade
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Vibration CharacteristicsFree Vibration – One DOF/Sector
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Vibration CharacteristicsFree Vibration – One DOF/Sector
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Vibration CharacteristicsFree Vibration – One DOF/Sector
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Vibration CharacteristicsFree Vibration – One DOF/Sector
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Vibration CharacteristicsFree Vibration – One DOF/Sector
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
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Mathematical ModelBladed Disk Assembly with Absorbers
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Mathematical ModelLinearized System Model
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Modal AnalysisBlock Decoupling the EOM
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Modal AnalysisSteady-State Modal Response
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Modal AnalysisSteady-State Modal Response
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Modal AnalysisSteady-State Modal Response
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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
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Special Case 1Blades Locked, Absorbers Free
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Special Case 2Blades Free, Absorbers Locked
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Special Case 2Blades Free, Absorbers Locked
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Special Case 3Single Isolated Sector, Blade/Absorber Free
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Special Case 3Single Isolated Sector, Blade/Absorber Free
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Special Case 3Single Isolated Sector, Blade/Absorber Free
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Special Case 3Single Isolated Sector, Blade/Absorber Free
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Special Case 3Single Isolated Sector, Blade/Absorber Free
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Special Case 3Single Isolated Sector, Blade/Absorber Free
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N = 10 Sectors, Blades/Absorbers FreeLinear Forced Response
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Linear Forced Response
MOVIE
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Linear Forced ResponseThe Effects of Detuning: No-Resonance Gap
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Linear Forced ResponseSummary of Frequency Response
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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
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