jswta 0001

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Japanese small wind turbine standard for design and structural safety. Use in complement with IEC 61400-2. Specialized for ClassNK’s Japanese certification scheme.

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  • 1.JSWTA 0001 Explanation of Simple Load Model for VAWT Henry Kurniadi

2. JSWTA 0001 Japanese small wind turbine standard for design and structural safety. Use in complement with IEC 61400-2. Specialized for ClassNKs Japanese certification scheme. 3. Coordinates and Axis System Definition of coordinate and axis system in Vertical Axis Wind Turbine system. 4. Load Case A: Fatigue during Operation During normal operation, a range of fluctuating loads will affect the turbine system. Unlike in HAWT, the fatigue loading does not consider the effects of changing rotor rotational speed. 5. Load Case A: Fatigue during Operation Blade (B) The loading fluctuates between maximum and minimum values, based on experimental result as a function of TSR (). 6. Load Case A: Fatigue during Operation Support Connector (S) The force acting on the blade handled by the support connector. The force acting on each support connector could be written as the radial force on the blade divided evenly by the number of connectors (S) for each blade. The torsional moment generated from rotor design torque, which divided evenly by each connector on each blade. 7. Load Case A: Fatigue during Operation Shaft (shaft) The torsional moment of the rotor shaft is equal to the rotor design torque. Rotor thrust generated during operation is a function of design wind speed. Bending moment of the rotor shaft determined by the thrust and the distance of the main bearing to the rotor center. (2 is the multiplying factor) 8. Load Case D: Maximum Thrust This is a maximum thrust applied to the shaft during normal operation regime. Similar assumption with HAWT. 9. Load Case D: Maximum Thrust Shaft (shaft) The thrust load consist of aerodynamic coefficient and dynamic pressure. Bending moment of the rotor shaft determined by the thrust and the distance of the main bearing to the rotor center. 10. Load Case E: Maximum Rotation Speed This load case represents the maximum operation condition. Similar assumption with HAWT with load case definition dominated by the maximum rotational speed. 11. Load Case E: Maximum Rotation Speed Blade (B) The load to each blade purely centrifugal force. 12. Load Case E: Maximum Rotation Speed Support Connector (S) The force acting on the blade handled by the support connector. The force acting on each support connector could be written as the radial force on the blade divided evenly by the number of connectors (S) for each blade. 13. Load Case E: Maximum Rotation Speed Shaft (shaft) The loading to rotor shaft is a bending moment. It is assumed that there is an eccentricity in the rotor shaft. 14. Load Case F: Shorted Connection This load case represent the short circuit condition. Similar assumption with HAWT. 15. Load Case F: Shorted Connection Shaft (shaft) The torsional moment to the rotor shaft due to generator short circuit. It is a function of the rotor design torque. 16. Load Case F: Shorted Connection Support Connector (S) The torsional moment to support connector calculated from rotor torsional moment, which divided evenly by each connector on each blade. 17. Load Case G: Braking This represents the braking action of the turbine system. Similar assumption with HAWT. 18. Load Case G: Braking Shaft (shaft) The torsional moment applied to the rotor shaft during braking assumed to be the sum of the brake torque and the rotor design torque. 19. Load Case G: Braking Support Connector (S) Similar to previous Load Case, the torsional moment to support connector calculated from rotor torsional moment, which divided evenly by each connector on each blade. 20. Load Case H: Extreme Wind In this load case, the turbine is not working and exposed to extreme wind condition. Similar assumption with HAWT. 21. Load Case H: Extreme Wind Blade (B) The blade is in standby situation. The force applied directly from the wind in X-direction. The aerodynamic loading applied to the blade consist of lift and drag and located in Y-direction. All loads are function of the blade projection area. 22. Load Case H: Extreme Wind Support Connector (S) The force acting on the blade handled by the support connector. The force acting on each support connector could be written as the applied force on the blade divided evenly by the number of connectors (S) for each blade. The bending moment applied in each support connector is a function of the connector length. 23. Load Case H: Extreme Wind Shaft (shaft) Wind load to rotor generated by the drag acting on the blade. Largest bending moment applied to the first bearing. The torsional moment to the rotor shaft caused by rotational force applied to the blade.