Transient Response Analysis by Impulse for Stresses at the Tip of Wind Turbine Blade along Y-Axis over a Time Interval

Abstract

Transient response analysis by impulse for stresses at the tip of Wind Turbine Blade along Y-axis over a time interval has been carried out. This involves the conversion of kinetic energy to electrical power using wind turbine blade. The geometry of this analysis was done using finite element, where the material was changed to Epoxy E-Glass Wet. After the finite element analysis the mesh independence occurred at 800 and 600 element size. The 800 element size was chosen for subsequent transient response analysis. In addition Campbell diagram was analyzed and showed that response vibration occurred at amplitude of 5.5x106Pa with a corresponding frequency of 5Hz. This gave a rotational speed of 262.4x106 rpm. At this point, transient response reached its steady-state at 3.8secs within the considered time interval of 1 to 5 secs, suggesting critically damped transient response with transient damping ratio equal to one. This shows that the impulse force is better applied in wind turbine blade transient analysis at a lower Von Mises stress to attain a quicker damping response steady-state, which favors wind turbine blade analysis.