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Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures

Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures. Background. Bladed Disk Assemblies. Background. Engine Order Excitation. Background. Conditions for Resonance. Background. Vibration Reduction via Order-Tuned Absorbers. Background. Self-tuning Impact Damper.

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Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures

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  1. Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures

  2. Background Bladed Disk Assemblies

  3. Background Engine Order Excitation

  4. Background Conditions for Resonance

  5. Background Vibration Reduction via Order-Tuned Absorbers

  6. Background Self-tuning Impact Damper Turbine Blade Sleeves Tuned Dampers Chamber & End Caps

  7. Vibration Characteristics Free Vibration – One DOF/Sector

  8. Vibration Characteristics Free Vibration – One DOF/Sector

  9. Vibration Characteristics Free Vibration – One DOF/Sector

  10. Vibration Characteristics Free Vibration – One DOF/Sector

  11. Vibration Characteristics Free Vibration – One DOF/Sector

  12. Mathematical Model Bladed Disk Assembly with Absorbers

  13. Mathematical Model Linearized System Model

  14. Modal Analysis Block Decoupling the EOM

  15. Modal Analysis Steady-State Modal Response

  16. Modal Analysis Steady-State Modal Response

  17. Modal Analysis Steady-State Modal Response

  18. Special Cases • Blades Locked, Absorbers Free • Gives Absorber Tuning Order • Blades Free, Absorbers Locked • A Benchmark to evaluate absorber performance • Single Isolated Sector, Blade/Absorber Free • Demonstrates the essential features of the full coupled system

  19. Special Case 1 Blades Locked, Absorbers Free

  20. Special Case 2 Blades Free, Absorbers Locked

  21. Special Case 2 Blades Free, Absorbers Locked

  22. Special Case 3 Single Isolated Sector, Blade/Absorber Free

  23. Special Case 3 Single Isolated Sector, Blade/Absorber Free

  24. Special Case 3 Single Isolated Sector, Blade/Absorber Free

  25. Special Case 3 Single Isolated Sector, Blade/Absorber Free

  26. Special Case 3 Single Isolated Sector, Blade/Absorber Free

  27. Special Case 3 Single Isolated Sector, Blade/Absorber Free

  28. Linear Forced Response N = 10 Sectors, Blades/Absorbers Free

  29. Linear Forced Response MOVIE

  30. Linear Forced Response The Effects of Detuning: No-Resonance Gap

  31. Linear Forced Response Summary of Frequency Response

  32. Summary • Linear, Perfectly Periodic System • Blades/Absorbers: absorber effective • Eigenfrequency structure: no resonance zone Directions for Future Work • Effects of damping • Effects of mistuning • General-path absorbers • Multi-DOF blade models • Nonlinear effects • Intentional mistuning

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