In this note the differences between static and dynamic balancing of a wind turbine rotor are addressed. The paper begins with a definition of each type of balancing. It is demonstrated that even if a horizontal axis wind turbine rotor is in static balance, the rotor can still be dynamically imbalanced. Dynamic imbalance can result in a yaw and/or teeter producing torque. A turbine rotor is only in a state of dynamic balance when the principle axes of inertia are aligned with the angular velocity vector. This criteria is illustrated with a point mass model.
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Technical Briefs
1.
Beer, Ferdinnand P., and Johnston, E. Russell, Jr., 1984, Vector Mechanics for Engineers: Statics and Dynamics, 4th ed., McGraw-Hill, New York.
2.
Greenwood, Donald T., 1965, Principles of Dynamics, Prentice-Hall, Englewood Cliffs, NJ.
3.
Kirchhoff, R. H., 1993,“Wind Turbine Rotor Mass Imbalance: The Connection to 1P, Part 1: Rigid Body Dynamics,” Proceedings, 12th ASME Wind Energy Symposium, Houston, TX, pp. 113–117.
4.
Kirchhoff, Robert H., and Borg, John P., 1994, “The Effect of Mass Imbalance on Azimuthal and Yaw Motion of a HAWT: Theory and Experiment,” EWEC Thessaloniki, Greece.
5.
Wells, Dare A., 1967, Schaum’s Outline of Theory and Problems of Lagrangian Dynamics, Schaum Publishing Co., New York.
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