Operating in natural wind field, a horizontal axis wind turbine suffers fluctuating aerodynamic loads, which result in oscillations of the rotor blades. Since the blade oscillation has considerable effects on the blade fatigue life, the influence on the fatigue loads from the interaction between the aerodynamic loads and the structural oscillations should be considered in the design process. The objective of this work is to analyze the fatigue loads on rotor blade due to inflow conditions and structural oscillation. The turbulent wind field is simulated with the Veers' model. For the calculation of aerodynamic loads on the rotor blades, vortex lattice method based on panel method was adopted. In order to consider the blade oscillation, a structural model with multiple degrees of freedom based on multi-body dynamics was used. For fatigue load analysis, each of the simulated time series of the loads was processed with the rain-flow counting algorithm.
