The effect of hinge spring restraints on two-bladed, teetered wind turbine rotors.

A. Swift, S. Rangwala, K. Hoenemser

Research output: Contribution to journalArticlepeer-review

Abstract

Presents the results of a parametric study regarding the effects of hinge spring restraints on the yaw damping and yaw position stability of two bladed teetered wind turbine rotors with and without delta three angle of the teeter hinge. Such a rotor design almost eliminates gyroscopic hub moments due to yaw rates. However, a teetered rotor located upwind of the yaw axis produces negative yaw damping that can cause problems in the yaw control system. It was known from a previously published simple linear analysis that teeter hinge spring restraints contribute to positive yaw damping and yaw position stability. The present study uses a more refined analytical rotor model and adds the significant effects of rotor overhang and of rotor torque in the presence of teeter oscillations, effects which had previously been neglected. It is shown how teeter spring restraints can be used to reduce the natural negative yaw damping and yaw positon stability of upwind rotors and what the penalties are in the form of increased hub moments. When applied to downwind free yawing teeter rotors, the hinge spring restraints improve wind following by increasing rotor yaw damping and yaw position stability. (A)

Original languageEnglish
Journal[No source information available]
StatePublished - 1985

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