Integration of complementary methods for monitoring stress/strain of wind turbine blades structures

Abstract

Abstract.The most important part of wind turbine is the blade that must be tested during the fabrication and during the functioning when can be damaged by moisture absorption, fatigue, wind gusts or lightning strikes. The novelty of the paper is represented by the employing of wireless sensors embedded in a scalable wind turbine blade made from Glass Fiber Reinforced Plastics together with Fiber Bragg Gratings in order to effectuate structural health monitoring in static conditions. The sensors are placed on critical location on blade determined by FEM simulation and a comparison between the complementary methods is done.

Prediction of the Damage Effect on Fiberglass-Reinforced Polymer Matrix Composites for Wind Turbine Blades

“…The load of 600 N was applied on the WTB tip, in the y direction ( Figure 2 ). Based on previous studies [ 14 , 17 , 18 ], the structure in the current research was subjected to a load perpendicular to the longitudinal axis of the blade, which has the greatest effect on the stresses and deformations of the structure. The displacements and rotations in all directions were constrained in the hub area, the WTB structure being subjected to bending.…”

“…The weak point of the composites used in the construction of the blades is that on the thickness of the composite the strength is ensured by the strength of the matrix. As presented in the literature, there are different sections and models of blade stiffening [ 16 , 17 , 18 , 19 , 20 ]. Some researchers [ 20 ] studied the problem of delamination of T-type joints between the cover and the stiffening elements inside the blade.…”