Long-term monitoring of a eighty meters high wind turbine steel tower

Abstract

In this paper is described the monitoring system developed for the long term monitoring of a wind turbine steel tower. The measured data include acceleration at various levels, strain on the tower wall, inclination on the upper part and temperature. To correlate with the wind velocity and direction, nacelle position and status and rotor speed the corresponding signals are obtained directly from the nacelle and incorporated in the measurement system. Preliminary results concerning the acceleration measurements and the modal identification are presented.