Effect of rotor angle to characteristic amplitude vibration shaft on wind turbine horizontal axis testing

Abstract

The vibrations that arise in the axis of the wind turbine is a phenomenon that results from the unstable wind velocity coming from the angle of the wind attacked by the blade of the wind turbine itself. Vibration is widely used as a tool to analyze both machines with rotation and translational motion. Knowledge of vibration and the resulting data is very important for maintenance and repair analysis. This understanding can help the technician to reduce downtime and can increase profits both in terms of production and from longer wind turbine life. Vibrations arising from cyclic forces through existing machine elements, where they interact with each other and energy is amplified through the structure in the form of vibration. The effects of vibration are the occurrence of noise, the decrease in performance and performance of wind turbines and can damage components in wind turbines especially on shafts and bearings. In this study varied angle blade (blade / rotor) wind turbine to the shaft as well as variations in the coming wind speed. With the variation can be observed and known behavior of vibration that occurs by measuring by using vibration vibrometer VQ-400-A OMETRON connected with Labjack U3-LV forwarded to the PC in the form of a digital power voltage to an analog voltage. This model measures vibration in the horizontal or x-axis direction where the laser focus point on the rotating wind turbine shaft. To display the measurement results are used labjack connected to the laptop PC. This research resulted that for wind speeds between 3- 4.5 m/s which has the smallest deviation using 30º blade angle to minimize the vibration that is between 0.2353425 mm to 0.356839 mm. Based on the calculation of critical frequency occurs if the frequency of turbine rotation up to the frequency of 9.464226 Hz and the simulation using ANSYS software apply frequency of 4.1854 Hz.