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Load Assumptions for the Design of electro mechanic Pitch Systems

Load Assumptions for the Design of electro mechanic Pitch Systems. Andreas Manjock Germanischer Lloyd Industrial Services GmbH, Business Segment Wind Energy Andreas.Manjock @gl-group.com, www.gl-group.com/glwind. Source: ENERCON.

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Load Assumptions for the Design of electro mechanic Pitch Systems

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  1. Load Assumptions for the Design of electro mechanic Pitch Systems Andreas Manjock Germanischer Lloyd Industrial Services GmbH, Business Segment Wind Energy Andreas.Manjock@gl-group.com, www.gl-group.com/glwind

  2. Source: ENERCON Load Assumptions for the Design of electro mechanic Pitch Systems • Design of electro mechanic Pitch System • Simulation Model • Design Load Cases (DLCs) • Data Postprocessing • Conclusion and Outlook EWEC 2007

  3. Drive Motor iPD iPB JPD JRB Blade Bearing Gear Box Rotor Blade iP 1.1 Pitch System Components Control Unit PitchController EWEC 2007

  4. Source: ENERCON Load Assumptions for the Design of electro mechanic Pitch Systems • Design of electro mechanic Pitch System • Simulation Model2.1 Load Components2.2 System Model2.3 Local Model for Mesh Moment2.4 Drive Motor Characteristics2.5 Drive Motor Limitations2.6 Drive Control Scheme • Design Load Cases (DLCs) • Data Postprocessing • Conclusion and Outlook EWEC 2007

  5. αP MZB MR MPDA 2.1 Load Components Blade Root Coordinate System MR = M0 + µbend∙ Mres+ µaxial∙ Faxial+ µradial∙ Fradial Source: GL „Guideline for the Certification of Wind Turbines“, 2003 EWEC 2007

  6. α Global Simulation Model P M i •M ZB P PDA M α R J • ** RB P 2 α J •i • ** PD P P 2 i • J +J P PD RB Source: GH Bladed 3.67 2.2 System Model Structural Model EWEC 2007

  7. α P •M M M i •M M ZB M P PDA M R J •α ** RB P 2 α J •i • ** PD P P +J RB Mass System Pitch Drive Mass System Rotor Blade Split of Mass System provides Loads for Drive Train Components 2.3 Local Model for Mesh Moment Local MM - Assumption“ α P 2 i • J P PD MM = MZB+ JRB ∙ αP** - MR EWEC 2007

  8. 2.4 Drive Motor Characteristics Drive Motor iPP MPDA Control Unit PitchController Source: OAT Osterholz Antriebstechnik GmbH EWEC 2007

  9. 2.5 Drive Motor Limitations Source: OAT Osterholz Antriebstechnik GmbH EWEC 2007

  10. 2.6 Drive Motor Control Scheme PitchController EWEC 2007

  11. Source: ENERCON Load Assumptions for the Design of electro mechanic Pitch Systems • Design of electro mechanic Pitch System • Simulation Model • Design Load Cases (DLCs)3.1 Identified Load Cases 3.2 Fatigue DLCs3.3 Extreme DLCs • Data Postprocessing • Conclusion and Outlook EWEC 2007

  12. 3.2 Identified Load Cases Fatigue Load Cases Extreme Load Cases Wind EWEC 2007

  13. 3.3 Fatigue DLCs Control Variables Load Variables EWEC 2007

  14. 3.4 Extreme DLCs Control Variables Load Variables EWEC 2007

  15. Source: ENERCON Load Assumptions for the Design of electro mechanic Pitch Systems • Design of electro mechanic Pitch System • Simulation Model • Design Load Cases (DLCs) • Data Postprocessing4.1 Design Driver4.2 Loads for Drive Motor4.3 Loads for Gearbox4.4 Loads for Blade Bearing Mesh • Conclusion and Outlook EWEC 2007

  16. 4.1 Design Driver EWEC 2007

  17. 4.2.1 Loads for Drive Motor • Operation States of Drive Motor, Confirmation of global Wind Turbine Simulation EWEC 2007

  18. 4.2.2 Thermal Loads for Drive Motor • Standard Deviation (RMS) of pitch actuator torque for thermal impact • Efficiency of gear box and has to be considered Normal bearing friction Increased bearing friction (+50%) EWEC 2007

  19. M_M > 0 M_M < 0 4.3 Loads for Gearbox • Load Duration Distribution counting for Mesh Torque M_M • Influence of Blade Bearing Friction Level comparatively low EWEC 2007

  20. 4.4 Loads for Blade Bearing Mesh • Load Duration Distribution counting for Mesh Torque M_M • Pitch Angle Duration Distribution counting EWEC 2007

  21. Source: ENERCON Load Assumptions for the Design of electro mechanic Pitch Systems • Design of electro mechanic Pitch System • Simulation Model • Design Load Cases (DLCs) • Data Postprocessing • Conclusion and Outlook EWEC 2007

  22. 5 Conclusion and Outlook • Aerodynamic pitch Moment MZB is not sufficient for the design of pitch systems drive train Pitch Actuator Torque is inevitable • Blade bearing friction model included in the global simulation model • Integration of drive control unit into the global simulation model, e.g. limitations in speed and torque of pitch drive actuator • 80% damage within first 20°- 25° of blade bearing mesh • Measurements on drive trains of pitch systems to validate MM-assumption EWEC 2007

  23. Keep in Contact Andreas ManjockGermanischer Lloyd Industrial ServicesAndreas.Manjock@gl-group.com, www.gl-group.com/glwind EWEC 2007

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